Did JPEG 2000 saved in Lossless or Lossy

asked 2017-10-20 12:32:57 -0600

I'm currently looking to save images in JPEG 2000 using OpenCV, but since no parameters can be passed to the write for the JPEG 2000 format, what compression mode and compression ratio value is used by OpenCV ?

Thanks, PA

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Use png if you want to save lossless

sturkmen ( 2017-10-20 12:39:32 -0600 )edit

I think that opencv use jasper library. Compression are set here but cannot be changed (without a PR) and set here .

LBerger ( 2017-10-20 13:04:25 -0600 )edit

Hi, maybe this can help you.

moHe ( 2017-10-22 03:01:01 -0600 )edit

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answered 2019-08-15 02:37:46 -0600

planetmarshall
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TL;DR - Lossless.

OpenCV uses libjasper to implement JPEG 2000 encoding and decoding, and uses the defaults which is the 'Integer' mode (lossless). OpenCV does not pass any options to the Jasper encoding library other than 'JP2', which specifies the full JPEG 2000 container format, as opposed to 'JPC' which is the codestream format.