[JPEG2000] ROI in JPEG2000 compression

asked 2016-09-26 03:53:02 -0600

P1t
1 ●1 ●1

Hi,

I would like to use the roi functionality of JPEG2000 in imencode function. This functionality allows to compress some parts with a level of compression lower than the rest of the image. I don't find any documentation about this in OpenCV doc and I would like to if OpenCV can handle this.

Thank you in advance

PS : I use Opencv 2.4 (for nom) on Ubuntu OS

answered 2016-09-26 04:10:13 -0600

berak
32993 ●7 ●81 ●312

at the moment, it's simply not possible, to do this from opencv.

if you really need ths feature, you'll have to interact with the jasper lib directly.

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After looking the jasper's FAQ, it seems that only the decoder can handle roi functionality.

P1t ( 2016-09-26 04:22:20 -0600 )edit

Image compression is pretty new for me, do you know some algorithm that allow this functionality? I would like to compress some image with loss except in the roi that need to be lossless.

P1t ( 2016-09-26 04:25:11 -0600 )edit

sorry, no idea about jasper.

berak ( 2016-09-26 04:31:54 -0600 )edit

can it be, you're wrong here in general ?

opencv is a computer-vision / machine-learning lib (and yes, it reads images, too), not a general purpose image manipulation one.

berak ( 2016-09-26 04:33:27 -0600 )edit

I use OpenCV because I do lot of processing on those images. The compression part is just the result step. This is why I was looking for openCV's solutions. Btw thank you for your answer

P1t ( 2016-09-26 04:58:37 -0600 )edit

nvm, was just guessing.

berak ( 2016-09-26 05:24:28 -0600 )edit

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