QuantInv8x8

Performs dequantization of an 8x8 block of DCT coefficients

Syntax

IppStatus ippiQuantInv8x8_JPEG_16s_C1I(Ipp16s* pSrcDst, const Ipp16u* pQuantInvTable);

Parameters

pSrcDst	Pointer to the DCT coefficients of the 8x8 block.
pQuantInvTable	Pointer to the quantization table for decoding.

Description

The function ippiQuantInv8x8_JPEG is declared in the ippj.h file. This function performs dequantization of the 8x8 block of DCT coefficients. Dequantization operation is defined in [ISO10918], Annex A.3.4, DCT Coefficient Quantization and Dequantization.

Return Values

ippStsNoErr	Indicates no error.
ippStsNullPtrErr	Indicates an error condition if one or both of the specified pointers are NULL.