org.opencv.imgcodecs.Imgcodecs

public class Imgcodecs
extends Object

Field Summary

Fields
Modifier and Type	Field	Description
`static int`	`IMREAD_ANYCOLOR`
`static int`	`IMREAD_ANYDEPTH`
`static int`	`IMREAD_COLOR`
`static int`	`IMREAD_GRAYSCALE`
`static int`	`IMREAD_IGNORE_ORIENTATION`
`static int`	`IMREAD_LOAD_GDAL`
`static int`	`IMREAD_REDUCED_COLOR_2`
`static int`	`IMREAD_REDUCED_COLOR_4`
`static int`	`IMREAD_REDUCED_COLOR_8`
`static int`	`IMREAD_REDUCED_GRAYSCALE_2`
`static int`	`IMREAD_REDUCED_GRAYSCALE_4`
`static int`	`IMREAD_REDUCED_GRAYSCALE_8`
`static int`	`IMREAD_UNCHANGED`
`static int`	`IMWRITE_AVIF_DEPTH`
`static int`	`IMWRITE_AVIF_QUALITY`
`static int`	`IMWRITE_AVIF_SPEED`
`static int`	`IMWRITE_EXR_COMPRESSION`
`static int`	`IMWRITE_EXR_COMPRESSION_B44`
`static int`	`IMWRITE_EXR_COMPRESSION_B44A`
`static int`	`IMWRITE_EXR_COMPRESSION_DWAA`
`static int`	`IMWRITE_EXR_COMPRESSION_DWAB`
`static int`	`IMWRITE_EXR_COMPRESSION_NO`
`static int`	`IMWRITE_EXR_COMPRESSION_PIZ`
`static int`	`IMWRITE_EXR_COMPRESSION_PXR24`
`static int`	`IMWRITE_EXR_COMPRESSION_RLE`
`static int`	`IMWRITE_EXR_COMPRESSION_ZIP`
`static int`	`IMWRITE_EXR_COMPRESSION_ZIPS`
`static int`	`IMWRITE_EXR_DWA_COMPRESSION_LEVEL`
`static int`	`IMWRITE_EXR_TYPE`
`static int`	`IMWRITE_EXR_TYPE_FLOAT`
`static int`	`IMWRITE_EXR_TYPE_HALF`
`static int`	`IMWRITE_HDR_COMPRESSION`
`static int`	`IMWRITE_HDR_COMPRESSION_NONE`
`static int`	`IMWRITE_HDR_COMPRESSION_RLE`
`static int`	`IMWRITE_JPEG_CHROMA_QUALITY`
`static int`	`IMWRITE_JPEG_LUMA_QUALITY`
`static int`	`IMWRITE_JPEG_OPTIMIZE`
`static int`	`IMWRITE_JPEG_PROGRESSIVE`
`static int`	`IMWRITE_JPEG_QUALITY`
`static int`	`IMWRITE_JPEG_RST_INTERVAL`
`static int`	`IMWRITE_JPEG_SAMPLING_FACTOR`
`static int`	`IMWRITE_JPEG_SAMPLING_FACTOR_411`
`static int`	`IMWRITE_JPEG_SAMPLING_FACTOR_420`
`static int`	`IMWRITE_JPEG_SAMPLING_FACTOR_422`
`static int`	`IMWRITE_JPEG_SAMPLING_FACTOR_440`
`static int`	`IMWRITE_JPEG_SAMPLING_FACTOR_444`
`static int`	`IMWRITE_JPEG2000_COMPRESSION_X1000`
`static int`	`IMWRITE_PAM_FORMAT_BLACKANDWHITE`
`static int`	`IMWRITE_PAM_FORMAT_GRAYSCALE`
`static int`	`IMWRITE_PAM_FORMAT_GRAYSCALE_ALPHA`
`static int`	`IMWRITE_PAM_FORMAT_NULL`
`static int`	`IMWRITE_PAM_FORMAT_RGB`
`static int`	`IMWRITE_PAM_FORMAT_RGB_ALPHA`
`static int`	`IMWRITE_PAM_TUPLETYPE`
`static int`	`IMWRITE_PNG_BILEVEL`
`static int`	`IMWRITE_PNG_COMPRESSION`
`static int`	`IMWRITE_PNG_STRATEGY`
`static int`	`IMWRITE_PNG_STRATEGY_DEFAULT`
`static int`	`IMWRITE_PNG_STRATEGY_FILTERED`
`static int`	`IMWRITE_PNG_STRATEGY_FIXED`
`static int`	`IMWRITE_PNG_STRATEGY_HUFFMAN_ONLY`
`static int`	`IMWRITE_PNG_STRATEGY_RLE`
`static int`	`IMWRITE_PXM_BINARY`
`static int`	`IMWRITE_TIFF_COMPRESSION`
`static int`	`IMWRITE_TIFF_RESUNIT`
`static int`	`IMWRITE_TIFF_XDPI`
`static int`	`IMWRITE_TIFF_YDPI`
`static int`	`IMWRITE_WEBP_QUALITY`

Constructor Summary

Constructors

Constructor Description

Imgcodecs()

Method Summary

Modifier and Type	Method	Description
`static boolean`	`haveImageReader(String filename)`	Returns true if the specified image can be decoded by OpenCV
`static boolean`	`haveImageWriter(String filename)`	Returns true if an image with the specified filename can be encoded by OpenCV
`static long`	`imcount(String filename)`	Returns the number of images inside the give file The function imcount will return the number of pages in a multi-page image, or 1 for single-page images
`static long`	`imcount(String filename, int flags)`	Returns the number of images inside the give file The function imcount will return the number of pages in a multi-page image, or 1 for single-page images
`static Mat`	`imdecode(Mat buf, int flags)`	Reads an image from a buffer in memory.
`static boolean`	`imdecodemulti(Mat buf, int flags, List<Mat> mats)`	Reads a multi-page image from a buffer in memory.
`static boolean`	`imencode(String ext, Mat img, MatOfByte buf)`	Encodes an image into a memory buffer.
`static boolean`	`imencode(String ext, Mat img, MatOfByte buf, MatOfInt params)`	Encodes an image into a memory buffer.
`static Mat`	`imread(String filename)`	Loads an image from a file.
`static Mat`	`imread(String filename, int flags)`	Loads an image from a file.
`static boolean`	`imreadmulti(String filename, List<Mat> mats)`	Loads a multi-page image from a file.
`static boolean`	`imreadmulti(String filename, List<Mat> mats, int flags)`	Loads a multi-page image from a file.
`static boolean`	`imreadmulti(String filename, List<Mat> mats, int start, int count)`	Loads a of images of a multi-page image from a file.
`static boolean`	`imreadmulti(String filename, List<Mat> mats, int start, int count, int flags)`	Loads a of images of a multi-page image from a file.
`static boolean`	`imwrite(String filename, Mat img)`	Saves an image to a specified file.
`static boolean`	`imwrite(String filename, Mat img, MatOfInt params)`	Saves an image to a specified file.
`static boolean`	`imwritemulti(String filename, List<Mat> img)`
`static boolean`	`imwritemulti(String filename, List<Mat> img, MatOfInt params)`

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details
- IMREAD_UNCHANGED
  
  public static final int IMREAD_UNCHANGED
  
  See Also:
  
  Constant Field Values
- IMREAD_GRAYSCALE
  
  public static final int IMREAD_GRAYSCALE
  
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  Constant Field Values
- IMREAD_COLOR
  
  public static final int IMREAD_COLOR
  
  See Also:
  
  Constant Field Values
- IMREAD_ANYDEPTH
  
  public static final int IMREAD_ANYDEPTH
  
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  Constant Field Values
- IMREAD_ANYCOLOR
  
  public static final int IMREAD_ANYCOLOR
  
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  Constant Field Values
- IMREAD_LOAD_GDAL
  
  public static final int IMREAD_LOAD_GDAL
  
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  Constant Field Values
- IMREAD_REDUCED_GRAYSCALE_2
  
  public static final int IMREAD_REDUCED_GRAYSCALE_2
  
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  Constant Field Values
- IMREAD_REDUCED_COLOR_2
  
  public static final int IMREAD_REDUCED_COLOR_2
  
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  Constant Field Values
- IMREAD_REDUCED_GRAYSCALE_4
  
  public static final int IMREAD_REDUCED_GRAYSCALE_4
  
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  Constant Field Values
- IMREAD_REDUCED_COLOR_4
  
  public static final int IMREAD_REDUCED_COLOR_4
  
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  Constant Field Values
- IMREAD_REDUCED_GRAYSCALE_8
  
  public static final int IMREAD_REDUCED_GRAYSCALE_8
  
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  Constant Field Values
- IMREAD_REDUCED_COLOR_8
  
  public static final int IMREAD_REDUCED_COLOR_8
  
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  Constant Field Values
- IMREAD_IGNORE_ORIENTATION
  
  public static final int IMREAD_IGNORE_ORIENTATION
  
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  Constant Field Values
- IMWRITE_EXR_COMPRESSION_NO
  
  public static final int IMWRITE_EXR_COMPRESSION_NO
  
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  Constant Field Values
- IMWRITE_EXR_COMPRESSION_RLE
  
  public static final int IMWRITE_EXR_COMPRESSION_RLE
  
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  Constant Field Values
- IMWRITE_EXR_COMPRESSION_ZIPS
  
  public static final int IMWRITE_EXR_COMPRESSION_ZIPS
  
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  Constant Field Values
- IMWRITE_EXR_COMPRESSION_ZIP
  
  public static final int IMWRITE_EXR_COMPRESSION_ZIP
  
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  Constant Field Values
- IMWRITE_EXR_COMPRESSION_PIZ
  
  public static final int IMWRITE_EXR_COMPRESSION_PIZ
  
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  Constant Field Values
- IMWRITE_EXR_COMPRESSION_PXR24
  
  public static final int IMWRITE_EXR_COMPRESSION_PXR24
  
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  Constant Field Values
- IMWRITE_EXR_COMPRESSION_B44
  
  public static final int IMWRITE_EXR_COMPRESSION_B44
  
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  Constant Field Values
- IMWRITE_EXR_COMPRESSION_B44A
  
  public static final int IMWRITE_EXR_COMPRESSION_B44A
  
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  Constant Field Values
- IMWRITE_EXR_COMPRESSION_DWAA
  
  public static final int IMWRITE_EXR_COMPRESSION_DWAA
  
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  Constant Field Values
- IMWRITE_EXR_COMPRESSION_DWAB
  
  public static final int IMWRITE_EXR_COMPRESSION_DWAB
  
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  Constant Field Values
- IMWRITE_EXR_TYPE_HALF
  
  public static final int IMWRITE_EXR_TYPE_HALF
  
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  Constant Field Values
- IMWRITE_EXR_TYPE_FLOAT
  
  public static final int IMWRITE_EXR_TYPE_FLOAT
  
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  Constant Field Values
- IMWRITE_JPEG_QUALITY
  
  public static final int IMWRITE_JPEG_QUALITY
  
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  Constant Field Values
- IMWRITE_JPEG_PROGRESSIVE
  
  public static final int IMWRITE_JPEG_PROGRESSIVE
  
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  Constant Field Values
- IMWRITE_JPEG_OPTIMIZE
  
  public static final int IMWRITE_JPEG_OPTIMIZE
  
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  Constant Field Values
- IMWRITE_JPEG_RST_INTERVAL
  
  public static final int IMWRITE_JPEG_RST_INTERVAL
  
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  Constant Field Values
- IMWRITE_JPEG_LUMA_QUALITY
  
  public static final int IMWRITE_JPEG_LUMA_QUALITY
  
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  Constant Field Values
- IMWRITE_JPEG_CHROMA_QUALITY
  
  public static final int IMWRITE_JPEG_CHROMA_QUALITY
  
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  Constant Field Values
- IMWRITE_JPEG_SAMPLING_FACTOR
  
  public static final int IMWRITE_JPEG_SAMPLING_FACTOR
  
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  Constant Field Values
- IMWRITE_PNG_COMPRESSION
  
  public static final int IMWRITE_PNG_COMPRESSION
  
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  Constant Field Values
- IMWRITE_PNG_STRATEGY
  
  public static final int IMWRITE_PNG_STRATEGY
  
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  Constant Field Values
- IMWRITE_PNG_BILEVEL
  
  public static final int IMWRITE_PNG_BILEVEL
  
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  Constant Field Values
- IMWRITE_PXM_BINARY
  
  public static final int IMWRITE_PXM_BINARY
  
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  Constant Field Values
- IMWRITE_EXR_TYPE
  
  public static final int IMWRITE_EXR_TYPE
  
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  Constant Field Values
- IMWRITE_EXR_COMPRESSION
  
  public static final int IMWRITE_EXR_COMPRESSION
  
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  Constant Field Values
- IMWRITE_EXR_DWA_COMPRESSION_LEVEL
  
  public static final int IMWRITE_EXR_DWA_COMPRESSION_LEVEL
  
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  Constant Field Values
- IMWRITE_WEBP_QUALITY
  
  public static final int IMWRITE_WEBP_QUALITY
  
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  Constant Field Values
- IMWRITE_HDR_COMPRESSION
  
  public static final int IMWRITE_HDR_COMPRESSION
  
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  Constant Field Values
- IMWRITE_PAM_TUPLETYPE
  
  public static final int IMWRITE_PAM_TUPLETYPE
  
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  Constant Field Values
- IMWRITE_TIFF_RESUNIT
  
  public static final int IMWRITE_TIFF_RESUNIT
  
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  Constant Field Values
- IMWRITE_TIFF_XDPI
  
  public static final int IMWRITE_TIFF_XDPI
  
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  Constant Field Values
- IMWRITE_TIFF_YDPI
  
  public static final int IMWRITE_TIFF_YDPI
  
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  Constant Field Values
- IMWRITE_TIFF_COMPRESSION
  
  public static final int IMWRITE_TIFF_COMPRESSION
  
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  Constant Field Values
- IMWRITE_JPEG2000_COMPRESSION_X1000
  
  public static final int IMWRITE_JPEG2000_COMPRESSION_X1000
  
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  Constant Field Values
- IMWRITE_AVIF_QUALITY
  
  public static final int IMWRITE_AVIF_QUALITY
  
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  Constant Field Values
- IMWRITE_AVIF_DEPTH
  
  public static final int IMWRITE_AVIF_DEPTH
  
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  Constant Field Values
- IMWRITE_AVIF_SPEED
  
  public static final int IMWRITE_AVIF_SPEED
  
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  Constant Field Values
- IMWRITE_HDR_COMPRESSION_NONE
  
  public static final int IMWRITE_HDR_COMPRESSION_NONE
  
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  Constant Field Values
- IMWRITE_HDR_COMPRESSION_RLE
  
  public static final int IMWRITE_HDR_COMPRESSION_RLE
  
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  Constant Field Values
- IMWRITE_JPEG_SAMPLING_FACTOR_411
  
  public static final int IMWRITE_JPEG_SAMPLING_FACTOR_411
  
  See Also:
  
  Constant Field Values
- IMWRITE_JPEG_SAMPLING_FACTOR_420
  
  public static final int IMWRITE_JPEG_SAMPLING_FACTOR_420
  
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  Constant Field Values
- IMWRITE_JPEG_SAMPLING_FACTOR_422
  
  public static final int IMWRITE_JPEG_SAMPLING_FACTOR_422
  
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  Constant Field Values
- IMWRITE_JPEG_SAMPLING_FACTOR_440
  
  public static final int IMWRITE_JPEG_SAMPLING_FACTOR_440
  
  See Also:
  
  Constant Field Values
- IMWRITE_JPEG_SAMPLING_FACTOR_444
  
  public static final int IMWRITE_JPEG_SAMPLING_FACTOR_444
  
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  Constant Field Values
- IMWRITE_PAM_FORMAT_NULL
  
  public static final int IMWRITE_PAM_FORMAT_NULL
  
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  Constant Field Values
- IMWRITE_PAM_FORMAT_BLACKANDWHITE
  
  public static final int IMWRITE_PAM_FORMAT_BLACKANDWHITE
  
  See Also:
  
  Constant Field Values
- IMWRITE_PAM_FORMAT_GRAYSCALE
  
  public static final int IMWRITE_PAM_FORMAT_GRAYSCALE
  
  See Also:
  
  Constant Field Values
- IMWRITE_PAM_FORMAT_GRAYSCALE_ALPHA
  
  public static final int IMWRITE_PAM_FORMAT_GRAYSCALE_ALPHA
  
  See Also:
  
  Constant Field Values
- IMWRITE_PAM_FORMAT_RGB
  
  public static final int IMWRITE_PAM_FORMAT_RGB
  
  See Also:
  
  Constant Field Values
- IMWRITE_PAM_FORMAT_RGB_ALPHA
  
  public static final int IMWRITE_PAM_FORMAT_RGB_ALPHA
  
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  Constant Field Values
- IMWRITE_PNG_STRATEGY_DEFAULT
  
  public static final int IMWRITE_PNG_STRATEGY_DEFAULT
  
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  Constant Field Values
- IMWRITE_PNG_STRATEGY_FILTERED
  
  public static final int IMWRITE_PNG_STRATEGY_FILTERED
  
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  Constant Field Values
- IMWRITE_PNG_STRATEGY_HUFFMAN_ONLY
  
  public static final int IMWRITE_PNG_STRATEGY_HUFFMAN_ONLY
  
  See Also:
  
  Constant Field Values
- IMWRITE_PNG_STRATEGY_RLE
  
  public static final int IMWRITE_PNG_STRATEGY_RLE
  
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  Constant Field Values
- IMWRITE_PNG_STRATEGY_FIXED
  
  public static final int IMWRITE_PNG_STRATEGY_FIXED
  
  See Also:
  
  Constant Field Values
Constructor Details
- Imgcodecs
  
  public Imgcodecs()
Method Details
- imread
  
  public static Mat imread(String filename, int flags)
  Loads an image from a file. imread The function imread loads an image from the specified file and returns it. If the image cannot be read (because of missing file, improper permissions, unsupported or invalid format), the function returns an empty matrix ( Mat::data==NULL ). Currently, the following file formats are supported:
  
  Windows bitmaps - \*.bmp, \*.dib (always supported)
  
  JPEG files - \*.jpeg, \*.jpg, \*.jpe (see the *Note* section)
  
  JPEG 2000 files - \*.jp2 (see the *Note* section)
  
  Portable Network Graphics - \*.png (see the *Note* section)
  
  WebP - \*.webp (see the *Note* section)
  
  AVIF - \*.avif (see the *Note* section)
  
  Portable image format - \*.pbm, \*.pgm, \*.ppm \*.pxm, \*.pnm (always supported)
  
  PFM files - \*.pfm (see the *Note* section)
  
  Sun rasters - \*.sr, \*.ras (always supported)
  
  TIFF files - \*.tiff, \*.tif (see the *Note* section)
  
  OpenEXR Image files - \*.exr (see the *Note* section)
  
  Radiance HDR - \*.hdr, \*.pic (always supported)
  
  Raster and Vector geospatial data supported by GDAL (see the *Note* section)
  
  Note:
  
  The function determines the type of an image by the content, not by the file extension.
  
  In the case of color images, the decoded images will have the channels stored in B G R order.
  
  When using IMREAD_GRAYSCALE, the codec's internal grayscale conversion will be used, if available. Results may differ to the output of cvtColor()
  
  On Microsoft Windows\* OS and MacOSX\*, the codecs shipped with an OpenCV image (libjpeg, libpng, libtiff, and libjasper) are used by default. So, OpenCV can always read JPEGs, PNGs, and TIFFs. On MacOSX, there is also an option to use native MacOSX image readers. But beware that currently these native image loaders give images with different pixel values because of the color management embedded into MacOSX.
  
  On Linux\*, BSD flavors and other Unix-like open-source operating systems, OpenCV looks for codecs supplied with an OS image. Install the relevant packages (do not forget the development files, for example, "libjpeg-dev", in Debian\* and Ubuntu\*) to get the codec support or turn on the OPENCV_BUILD_3RDPARTY_LIBS flag in CMake.
  
  In the case you set *WITH_GDAL* flag to true in CMake and REF: IMREAD_LOAD_GDAL to load the image, then the [GDAL](http://www.gdal.org) driver will be used in order to decode the image, supporting the following formats: [Raster](http://www.gdal.org/formats_list.html), [Vector](http://www.gdal.org/ogr_formats.html).
  
  If EXIF information is embedded in the image file, the EXIF orientation will be taken into account and thus the image will be rotated accordingly except if the flags REF: IMREAD_IGNORE_ORIENTATION or REF: IMREAD_UNCHANGED are passed.
  
  Use the IMREAD_UNCHANGED flag to keep the floating point values from PFM image.
  
  By default number of pixels must be less than 2^30. Limit can be set using system variable OPENCV_IO_MAX_IMAGE_PIXELS
  Parameters:
  
  filename - Name of file to be loaded.
  
  flags - Flag that can take values of cv::ImreadModes
  
  Returns:
  
  automatically generated
- imread
  
  public static Mat imread(String filename)
  Loads an image from a file. imread The function imread loads an image from the specified file and returns it. If the image cannot be read (because of missing file, improper permissions, unsupported or invalid format), the function returns an empty matrix ( Mat::data==NULL ). Currently, the following file formats are supported:
  
  Windows bitmaps - \*.bmp, \*.dib (always supported)
  
  JPEG files - \*.jpeg, \*.jpg, \*.jpe (see the *Note* section)
  
  JPEG 2000 files - \*.jp2 (see the *Note* section)
  
  Portable Network Graphics - \*.png (see the *Note* section)
  
  WebP - \*.webp (see the *Note* section)
  
  AVIF - \*.avif (see the *Note* section)
  
  Portable image format - \*.pbm, \*.pgm, \*.ppm \*.pxm, \*.pnm (always supported)
  
  PFM files - \*.pfm (see the *Note* section)
  
  Sun rasters - \*.sr, \*.ras (always supported)
  
  TIFF files - \*.tiff, \*.tif (see the *Note* section)
  
  OpenEXR Image files - \*.exr (see the *Note* section)
  
  Radiance HDR - \*.hdr, \*.pic (always supported)
  
  Raster and Vector geospatial data supported by GDAL (see the *Note* section)
  
  Note:
  
  The function determines the type of an image by the content, not by the file extension.
  
  In the case of color images, the decoded images will have the channels stored in B G R order.
  
  When using IMREAD_GRAYSCALE, the codec's internal grayscale conversion will be used, if available. Results may differ to the output of cvtColor()
  
  On Microsoft Windows\* OS and MacOSX\*, the codecs shipped with an OpenCV image (libjpeg, libpng, libtiff, and libjasper) are used by default. So, OpenCV can always read JPEGs, PNGs, and TIFFs. On MacOSX, there is also an option to use native MacOSX image readers. But beware that currently these native image loaders give images with different pixel values because of the color management embedded into MacOSX.
  
  On Linux\*, BSD flavors and other Unix-like open-source operating systems, OpenCV looks for codecs supplied with an OS image. Install the relevant packages (do not forget the development files, for example, "libjpeg-dev", in Debian\* and Ubuntu\*) to get the codec support or turn on the OPENCV_BUILD_3RDPARTY_LIBS flag in CMake.
  
  In the case you set *WITH_GDAL* flag to true in CMake and REF: IMREAD_LOAD_GDAL to load the image, then the [GDAL](http://www.gdal.org) driver will be used in order to decode the image, supporting the following formats: [Raster](http://www.gdal.org/formats_list.html), [Vector](http://www.gdal.org/ogr_formats.html).
  
  If EXIF information is embedded in the image file, the EXIF orientation will be taken into account and thus the image will be rotated accordingly except if the flags REF: IMREAD_IGNORE_ORIENTATION or REF: IMREAD_UNCHANGED are passed.
  
  Use the IMREAD_UNCHANGED flag to keep the floating point values from PFM image.
  
  By default number of pixels must be less than 2^30. Limit can be set using system variable OPENCV_IO_MAX_IMAGE_PIXELS
  Parameters:
  
  filename - Name of file to be loaded.
  
  Returns:
  
  automatically generated
- imreadmulti
  
  public static boolean imreadmulti(String filename, List<Mat> mats, int flags)
  
  Loads a multi-page image from a file. The function imreadmulti loads a multi-page image from the specified file into a vector of Mat objects.
  
  Parameters:
  
  filename - Name of file to be loaded.
  
  mats - A vector of Mat objects holding each page.
  
  flags - Flag that can take values of cv::ImreadModes, default with cv::IMREAD_ANYCOLOR. SEE: cv::imread
  
  Returns:
  
  automatically generated
- imreadmulti
  
  public static boolean imreadmulti(String filename, List<Mat> mats)
  
  Loads a multi-page image from a file. The function imreadmulti loads a multi-page image from the specified file into a vector of Mat objects.
  
  Parameters:
  
  filename - Name of file to be loaded.
  
  mats - A vector of Mat objects holding each page. SEE: cv::imread
  
  Returns:
  
  automatically generated
- imreadmulti
  
  public static boolean imreadmulti(String filename, List<Mat> mats, int start, int count, int flags)
  
  Loads a of images of a multi-page image from a file. The function imreadmulti loads a specified range from a multi-page image from the specified file into a vector of Mat objects.
  
  Parameters:
  
  filename - Name of file to be loaded.
  
  mats - A vector of Mat objects holding each page.
  
  start - Start index of the image to load
  
  count - Count number of images to load
  
  flags - Flag that can take values of cv::ImreadModes, default with cv::IMREAD_ANYCOLOR. SEE: cv::imread
  
  Returns:
  
  automatically generated
- imreadmulti
  
  public static boolean imreadmulti(String filename, List<Mat> mats, int start, int count)
  
  Loads a of images of a multi-page image from a file. The function imreadmulti loads a specified range from a multi-page image from the specified file into a vector of Mat objects.
  
  Parameters:
  
  filename - Name of file to be loaded.
  
  mats - A vector of Mat objects holding each page.
  
  start - Start index of the image to load
  
  count - Count number of images to load SEE: cv::imread
  
  Returns:
  
  automatically generated
- imcount
  
  public static long imcount(String filename, int flags)
  
  Returns the number of images inside the give file The function imcount will return the number of pages in a multi-page image, or 1 for single-page images
  
  Parameters:
  
  filename - Name of file to be loaded.
  
  flags - Flag that can take values of cv::ImreadModes, default with cv::IMREAD_ANYCOLOR.
  
  Returns:
  
  automatically generated
- imcount
  
  public static long imcount(String filename)
  
  Returns the number of images inside the give file The function imcount will return the number of pages in a multi-page image, or 1 for single-page images
  
  Parameters:
  
  filename - Name of file to be loaded.
  
  Returns:
  
  automatically generated
- imwrite
  
  public static boolean imwrite(String filename, Mat img, MatOfInt params)
  Saves an image to a specified file. The function imwrite saves the image to the specified file. The image format is chosen based on the filename extension (see cv::imread for the list of extensions). In general, only 8-bit unsigned (CV_8U) single-channel or 3-channel (with 'BGR' channel order) images can be saved using this function, with these exceptions:
  
  With OpenEXR encoder, only 32-bit float (CV_32F) images can be saved.
  
  8-bit unsigned (CV_8U) images are not supported.
  
  With Radiance HDR encoder, non 64-bit float (CV_64F) images can be saved.
  
  All images will be converted to 32-bit float (CV_32F).
  
  With JPEG 2000 encoder, 8-bit unsigned (CV_8U) and 16-bit unsigned (CV_16U) images can be saved.
  
  With PAM encoder, 8-bit unsigned (CV_8U) and 16-bit unsigned (CV_16U) images can be saved.
  
  With PNG encoder, 8-bit unsigned (CV_8U) and 16-bit unsigned (CV_16U) images can be saved.
  
  PNG images with an alpha channel can be saved using this function. To do this, create 8-bit (or 16-bit) 4-channel image BGRA, where the alpha channel goes last. Fully transparent pixels should have alpha set to 0, fully opaque pixels should have alpha set to 255/65535 (see the code sample below).
  
  With PGM/PPM encoder, 8-bit unsigned (CV_8U) and 16-bit unsigned (CV_16U) images can be saved.
  
  With TIFF encoder, 8-bit unsigned (CV_8U), 16-bit unsigned (CV_16U), 32-bit float (CV_32F) and 64-bit float (CV_64F) images can be saved.
  
  Multiple images (vector of Mat) can be saved in TIFF format (see the code sample below).
  
  32-bit float 3-channel (CV_32FC3) TIFF images will be saved using the LogLuv high dynamic range encoding (4 bytes per pixel)
  
  If the image format is not supported, the image will be converted to 8-bit unsigned (CV_8U) and saved that way.
  
  If the format, depth or channel order is different, use Mat::convertTo and cv::cvtColor to convert it before saving. Or, use the universal FileStorage I/O functions to save the image to XML or YAML format. The sample below shows how to create a BGRA image, how to set custom compression parameters and save it to a PNG file. It also demonstrates how to save multiple images in a TIFF file: INCLUDE: snippets/imgcodecs_imwrite.cpp
  Parameters:
  
  filename - Name of the file.
  
  img - (Mat or vector of Mat) Image or Images to be saved.
  
  params - Format-specific parameters encoded as pairs (paramId_1, paramValue_1, paramId_2, paramValue_2, ... .) see cv::ImwriteFlags
  
  Returns:
  
  automatically generated
- imwrite
  
  public static boolean imwrite(String filename, Mat img)
  Saves an image to a specified file. The function imwrite saves the image to the specified file. The image format is chosen based on the filename extension (see cv::imread for the list of extensions). In general, only 8-bit unsigned (CV_8U) single-channel or 3-channel (with 'BGR' channel order) images can be saved using this function, with these exceptions:
  
  With OpenEXR encoder, only 32-bit float (CV_32F) images can be saved.
  
  8-bit unsigned (CV_8U) images are not supported.
  
  With Radiance HDR encoder, non 64-bit float (CV_64F) images can be saved.
  
  All images will be converted to 32-bit float (CV_32F).
  
  With JPEG 2000 encoder, 8-bit unsigned (CV_8U) and 16-bit unsigned (CV_16U) images can be saved.
  
  With PAM encoder, 8-bit unsigned (CV_8U) and 16-bit unsigned (CV_16U) images can be saved.
  
  With PNG encoder, 8-bit unsigned (CV_8U) and 16-bit unsigned (CV_16U) images can be saved.
  
  PNG images with an alpha channel can be saved using this function. To do this, create 8-bit (or 16-bit) 4-channel image BGRA, where the alpha channel goes last. Fully transparent pixels should have alpha set to 0, fully opaque pixels should have alpha set to 255/65535 (see the code sample below).
  
  With PGM/PPM encoder, 8-bit unsigned (CV_8U) and 16-bit unsigned (CV_16U) images can be saved.
  
  With TIFF encoder, 8-bit unsigned (CV_8U), 16-bit unsigned (CV_16U), 32-bit float (CV_32F) and 64-bit float (CV_64F) images can be saved.
  
  Multiple images (vector of Mat) can be saved in TIFF format (see the code sample below).
  
  32-bit float 3-channel (CV_32FC3) TIFF images will be saved using the LogLuv high dynamic range encoding (4 bytes per pixel)
  
  If the image format is not supported, the image will be converted to 8-bit unsigned (CV_8U) and saved that way.
  
  If the format, depth or channel order is different, use Mat::convertTo and cv::cvtColor to convert it before saving. Or, use the universal FileStorage I/O functions to save the image to XML or YAML format. The sample below shows how to create a BGRA image, how to set custom compression parameters and save it to a PNG file. It also demonstrates how to save multiple images in a TIFF file: INCLUDE: snippets/imgcodecs_imwrite.cpp
  Parameters:
  
  filename - Name of the file.
  
  img - (Mat or vector of Mat) Image or Images to be saved.
  
  Returns:
  
  automatically generated
- imwritemulti
  
  public static boolean imwritemulti(String filename, List<Mat> img, MatOfInt params)
- imwritemulti
  
  public static boolean imwritemulti(String filename, List<Mat> img)
- imdecode
  
  public static Mat imdecode(Mat buf, int flags)
  
  Reads an image from a buffer in memory. The function imdecode reads an image from the specified buffer in the memory. If the buffer is too short or contains invalid data, the function returns an empty matrix ( Mat::data==NULL ). See cv::imread for the list of supported formats and flags description. Note: In the case of color images, the decoded images will have the channels stored in B G R order.
  
  Parameters:
  
  buf - Input array or vector of bytes.
  
  flags - The same flags as in cv::imread, see cv::ImreadModes.
  
  Returns:
  
  automatically generated
- imdecodemulti
  
  public static boolean imdecodemulti(Mat buf, int flags, List<Mat> mats)
  
  Reads a multi-page image from a buffer in memory. The function imdecodemulti reads a multi-page image from the specified buffer in the memory. If the buffer is too short or contains invalid data, the function returns false. See cv::imreadmulti for the list of supported formats and flags description. Note: In the case of color images, the decoded images will have the channels stored in B G R order.
  
  Parameters:
  
  buf - Input array or vector of bytes.
  
  flags - The same flags as in cv::imread, see cv::ImreadModes.
  
  mats - A vector of Mat objects holding each page, if more than one.
  
  Returns:
  
  automatically generated
- imencode
  
  public static boolean imencode(String ext, Mat img, MatOfByte buf, MatOfInt params)
  
  Encodes an image into a memory buffer. The function imencode compresses the image and stores it in the memory buffer that is resized to fit the result. See cv::imwrite for the list of supported formats and flags description.
  
  Parameters:
  
  ext - File extension that defines the output format. Must include a leading period.
  
  img - Image to be written.
  
  buf - Output buffer resized to fit the compressed image.
  
  params - Format-specific parameters. See cv::imwrite and cv::ImwriteFlags.
  
  Returns:
  
  automatically generated
- imencode
  
  public static boolean imencode(String ext, Mat img, MatOfByte buf)
  
  Encodes an image into a memory buffer. The function imencode compresses the image and stores it in the memory buffer that is resized to fit the result. See cv::imwrite for the list of supported formats and flags description.
  
  Parameters:
  
  ext - File extension that defines the output format. Must include a leading period.
  
  img - Image to be written.
  
  buf - Output buffer resized to fit the compressed image.
  
  Returns:
  
  automatically generated
- haveImageReader
  
  public static boolean haveImageReader(String filename)
  
  Returns true if the specified image can be decoded by OpenCV
  
  Parameters:
  
  filename - File name of the image
  
  Returns:
  
  automatically generated
- haveImageWriter
  
  public static boolean haveImageWriter(String filename)
  
  Returns true if an image with the specified filename can be encoded by OpenCV
  
  Parameters:
  
  filename - File name of the image
  
  Returns:
  
  automatically generated

Class Imgcodecs

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