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Jpeg2000 encode not lossless

ex_t_
Beginner
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hello.


I'm using uic samplecode(Jpeg2000codec) (I know that conde is already not supported)


I tried  an Jpeg2000 Image(All pixcel data is 1000) decoding → encoding(lossless).


but the pixcel data is differntfrom before decoding .


parameter of PARAMS_JPEG2K

1.useMCT = 0

2.quality = 100

3.mode  0(lossless)

4.wt = 0(WT53)


by the way ,I'm just wondering ippiEncodeGetDist_JPEG2K work.


I expected the highest distortion value appear around nOfPasses.


but it appears when i == 8 (nOfPasses  =43).


Because of that , after 8th coding pass slope  are not calcurated.


(ippiEncodeLoadCodeBlock_JPEG2K_32s_C1R and ippiEncodeStoreBits_JPEG2K_1u parameters are default value.)


thanks.

 

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