OpenCV  4.7.0-dev
Open Source Computer Vision
Classes | Namespaces | Enumerations | Functions
imgcodecs.hpp File Reference
#include "opencv2/core.hpp"

Classes

class  cv::ImageCollection
 To read Multi Page images on demand. More...
 
struct  cv::ImageCollection::iterator
 

Namespaces

 cv
 "black box" representation of the file storage associated with a file on disk.
 

Enumerations

enum  cv::ImreadModes {
  cv::IMREAD_UNCHANGED = -1,
  cv::IMREAD_GRAYSCALE = 0,
  cv::IMREAD_COLOR = 1,
  cv::IMREAD_ANYDEPTH = 2,
  cv::IMREAD_ANYCOLOR = 4,
  cv::IMREAD_LOAD_GDAL = 8,
  cv::IMREAD_REDUCED_GRAYSCALE_2 = 16,
  cv::IMREAD_REDUCED_COLOR_2 = 17,
  cv::IMREAD_REDUCED_GRAYSCALE_4 = 32,
  cv::IMREAD_REDUCED_COLOR_4 = 33,
  cv::IMREAD_REDUCED_GRAYSCALE_8 = 64,
  cv::IMREAD_REDUCED_COLOR_8 = 65,
  cv::IMREAD_IGNORE_ORIENTATION = 128
}
 Imread flags. More...
 
enum  cv::ImwriteEXRCompressionFlags {
  cv::IMWRITE_EXR_COMPRESSION_NO = 0,
  cv::IMWRITE_EXR_COMPRESSION_RLE = 1,
  cv::IMWRITE_EXR_COMPRESSION_ZIPS = 2,
  cv::IMWRITE_EXR_COMPRESSION_ZIP = 3,
  cv::IMWRITE_EXR_COMPRESSION_PIZ = 4,
  cv::IMWRITE_EXR_COMPRESSION_PXR24 = 5,
  cv::IMWRITE_EXR_COMPRESSION_B44 = 6,
  cv::IMWRITE_EXR_COMPRESSION_B44A = 7,
  cv::IMWRITE_EXR_COMPRESSION_DWAA = 8,
  cv::IMWRITE_EXR_COMPRESSION_DWAB = 9
}
 
enum  cv::ImwriteEXRTypeFlags {
  cv::IMWRITE_EXR_TYPE_HALF = 1,
  cv::IMWRITE_EXR_TYPE_FLOAT = 2
}
 
enum  cv::ImwriteFlags {
  cv::IMWRITE_JPEG_QUALITY = 1,
  cv::IMWRITE_JPEG_PROGRESSIVE = 2,
  cv::IMWRITE_JPEG_OPTIMIZE = 3,
  cv::IMWRITE_JPEG_RST_INTERVAL = 4,
  cv::IMWRITE_JPEG_LUMA_QUALITY = 5,
  cv::IMWRITE_JPEG_CHROMA_QUALITY = 6,
  cv::IMWRITE_JPEG_SAMPLING_FACTOR = 7,
  cv::IMWRITE_PNG_COMPRESSION = 16,
  cv::IMWRITE_PNG_STRATEGY = 17,
  cv::IMWRITE_PNG_BILEVEL = 18,
  cv::IMWRITE_PXM_BINARY = 32,
  cv::IMWRITE_EXR_TYPE = (3 << 4) + 0,
  cv::IMWRITE_EXR_COMPRESSION = (3 << 4) + 1,
  cv::IMWRITE_EXR_DWA_COMPRESSION_LEVEL = (3 << 4) + 2,
  cv::IMWRITE_WEBP_QUALITY = 64,
  cv::IMWRITE_HDR_COMPRESSION = (5 << 4) + 0,
  cv::IMWRITE_PAM_TUPLETYPE = 128,
  cv::IMWRITE_TIFF_RESUNIT = 256,
  cv::IMWRITE_TIFF_XDPI = 257,
  cv::IMWRITE_TIFF_YDPI = 258,
  cv::IMWRITE_TIFF_COMPRESSION = 259,
  cv::IMWRITE_JPEG2000_COMPRESSION_X1000 = 272
}
 Imwrite flags. More...
 
enum  cv::ImwriteHDRCompressionFlags {
  cv::IMWRITE_HDR_COMPRESSION_NONE = 0,
  cv::IMWRITE_HDR_COMPRESSION_RLE = 1
}
 Imwrite HDR specific values for IMWRITE_HDR_COMPRESSION parameter key. More...
 
enum  cv::ImwriteJPEGSamplingFactorParams {
  cv::IMWRITE_JPEG_SAMPLING_FACTOR_411 = 0x411111,
  cv::IMWRITE_JPEG_SAMPLING_FACTOR_420 = 0x221111,
  cv::IMWRITE_JPEG_SAMPLING_FACTOR_422 = 0x211111,
  cv::IMWRITE_JPEG_SAMPLING_FACTOR_440 = 0x121111,
  cv::IMWRITE_JPEG_SAMPLING_FACTOR_444 = 0x111111
}
 
enum  cv::ImwritePAMFlags {
  cv::IMWRITE_PAM_FORMAT_NULL = 0,
  cv::IMWRITE_PAM_FORMAT_BLACKANDWHITE = 1,
  cv::IMWRITE_PAM_FORMAT_GRAYSCALE = 2,
  cv::IMWRITE_PAM_FORMAT_GRAYSCALE_ALPHA = 3,
  cv::IMWRITE_PAM_FORMAT_RGB = 4,
  cv::IMWRITE_PAM_FORMAT_RGB_ALPHA = 5
}
 Imwrite PAM specific tupletype flags used to define the 'TUPLETYPE' field of a PAM file. More...
 
enum  cv::ImwritePNGFlags {
  cv::IMWRITE_PNG_STRATEGY_DEFAULT = 0,
  cv::IMWRITE_PNG_STRATEGY_FILTERED = 1,
  cv::IMWRITE_PNG_STRATEGY_HUFFMAN_ONLY = 2,
  cv::IMWRITE_PNG_STRATEGY_RLE = 3,
  cv::IMWRITE_PNG_STRATEGY_FIXED = 4
}
 Imwrite PNG specific flags used to tune the compression algorithm. More...
 

Functions

bool cv::haveImageReader (const String &filename)
 Returns true if the specified image can be decoded by OpenCV. More...
 
bool cv::haveImageWriter (const String &filename)
 Returns true if an image with the specified filename can be encoded by OpenCV. More...
 
size_t cv::imcount (const String &filename, int flags=IMREAD_ANYCOLOR)
 Returns the number of images inside the give file. More...
 
Mat cv::imdecode (InputArray buf, int flags)
 Reads an image from a buffer in memory. More...
 
Mat cv::imdecode (InputArray buf, int flags, Mat *dst)
 
bool cv::imdecodemulti (InputArray buf, int flags, std::vector< Mat > &mats)
 Reads a multi-page image from a buffer in memory. More...
 
bool cv::imencode (const String &ext, InputArray img, std::vector< uchar > &buf, const std::vector< int > &params=std::vector< int >())
 Encodes an image into a memory buffer. More...
 
Mat cv::imread (const String &filename, int flags=IMREAD_COLOR)
 Loads an image from a file. More...
 
bool cv::imreadmulti (const String &filename, std::vector< Mat > &mats, int flags=IMREAD_ANYCOLOR)
 Loads a multi-page image from a file. More...
 
bool cv::imreadmulti (const String &filename, std::vector< Mat > &mats, int start, int count, int flags=IMREAD_ANYCOLOR)
 Loads a of images of a multi-page image from a file. More...
 
bool cv::imwrite (const String &filename, InputArray img, const std::vector< int > &params=std::vector< int >())
 Saves an image to a specified file. More...
 
static bool cv::imwritemulti (const String &filename, InputArrayOfArrays img, const std::vector< int > &params=std::vector< int >())