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Hello all,
For optimization of IJG standard JPEG encoder & decoder,I am replacing IDCT,VLC,dequantization etc. functions using corrosponding IPP library functions.
All functions are giving proper outputs except IDCT function.
Each & every value of output of IPP's IDCT function differs by 2-5 from IJG's IDCT function.
Hence,I am getting artifacts in output image.I have tried much,but unable to reach solution.
If anybody knows the solution,plz reply soon.
The detail information is as follows:
The IPP function I have used is:
ippiDCTQuantInv8x8LS_JPEG_16s8u_C1R
While the IJG's standard function 'jpeg_idct_islow' uses algorithm developed by 'C. Loeffler, A. Ligtenberg and G. Moschytz'.
I am using evaluation version 4.1 of IPP on windows2000.I am using VC++ version 6.0.
Thanking You in anticipation.
Regards,
Rahul
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Message Edited by vdudnik on 06-08-2005 02:39 AM
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ippiDCT8x8Inv_16s_C1I and AP-945
Stephan
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