Jpeg2000 encode not lossless

ex_t_ — Fri, 12 Feb 2016 05:02:06 GMT

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.

topic Jpeg2000 encode not lossless in Intel® Integrated Performance Primitives