DCT IDCT result do not match.

well_doing — Wed, 18 Jun 2008 15:01:27 GMT

Hello,

The DCT and IDCT functions provided by your IPP library do not produce matching results.

See, in the case like

[X0] -> DCT -> [Y1] -> IDCT -> [X1] -> DCT -> [Y2]

In result, [Y1] != [Y2].

Here I am refering to ippiDCT8x8Inv_16s8u_C1R() & ippiDCT8x8Fwd_8u16s_C1R(),

andippiDCT8x8Inv_16s_C1R() &ippiDCT8x8Fwd_16s_C1R()

Any suggestion?

Thanks,

Robert

Re: DCT IDCT result do not match.

Vladimir_Dudnik — Wed, 18 Jun 2008 15:12:38 GMT

Robert,

what is data range in your case? How big the difference is? Remember, IPP 16-bit DCT functions use integer calculations. If accuracy they can provide does not fit your need you can use 32f DCT functions.

Vladimir

topic Re: DCT IDCT result do not match. in Intel® Integrated Performance Primitives

DCT IDCT result do not match.

Re: DCT IDCT result do not match.