opencv cv2 image io read write interface
https://docs.opencv.org/3.4/d4/da8/group__imgcodecs.html◆ imdecode()
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. ◆ imencode()
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.
img Image to be written.
buf Output buffer resized to fit the compressed image.
params Format-specific parameters. See cv::imwrite and cv::ImwriteFlags.
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