Enumerations
enum cv::ImreadModes {
cv::IMREAD_UNCHANGED = -1, //如果设置,则按原样返回加载的图像(使用Alpha通道,否则将被裁剪)。忽略EXIF方向。
cv::IMREAD_GRAYSCALE = 0,//如果设置,则始终将图像转换为单通道灰度图像(编解码器内部转换)。
cv::IMREAD_COLOR = 1,//如果设置,请始终将图像转换为3通道BGR彩色图像。
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
}
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_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_WEBP_QUALITY = 64,
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
}
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
}
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
}
Functions
bool cv::haveImageReader (const String &filename) //图像可能被解码,则返回true
bool cv::haveImageWriter (const String &filename) //图像可能被编码,则返回true
/*
如果缓冲区太短或包含无效数据,则该函数返回一个空矩阵(Mat :: data == NULL)。
有关支持的格式和标志说明的列表,请参见cv :: imread。
注意
在彩色图像的情况下,解码图像将具有以BGR顺序存储的通道。
参量
buf 输入数组或字节向量。
flags cv::ImreadModes。
*/
Mat cv::imdecode (InputArray buf, int flags) //从内存中的缓冲区读取图像。
Mat cv::imdecode (InputArray buf, int flags, Mat *dst)
bool cv::imencode (const String &ext,
InputArray img,
std::vector< uchar > &buf,
const std::vector< int > ¶ms=std::vector< int >()
)//将图像编码到内存缓冲区中。
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::imwrite (const String &filename, InputArray img, const std::vector< int > ¶ms=std::vector< int >())//Saves an image to a specified file. More...