Extend image I/O API with metadata support #27499
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[tested] * AVIF encoder can write exif, xmp, icc * AVIF decoder can read exif * JPEG encoder can write exif * JPEG decoder can read exif [/tested] * (?) probably PNG, WebP etc. decoders can also read exif, need to check.
2. fixed potential compile errors when opencv is built without avif
asmorkalov
reviewed
Jul 1, 2025
…be added later into opencv itself)
2. print warning if certain encoders don't support metadata ('yet' or 'at all').
3. added sanity check for jpg, png and avif that exif is read properly.
asmorkalov
approved these changes
Jul 1, 2025
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Covered with the PR:
This PR is a sort of preamble for #27488. I suggest to merge this one first to OpenCV 4.x, then promote this change to OpenCV 5.x and then provide extra API to read and write metadata in 5.x (or maybe 4.x) in a style similar to #27488. Maybe in that PR exif packing/unpacking should be done using a separate external API. That is, metadata reading and writing can/should be done in 2 steps:
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Patch to opencv_extra has the same branch name.