JPEG_ScanHeader Struct Reference

#include <jpeg.h>

Data Fields
JPEG_ScanHeader_Component	componentList [JPEG_MAXIMUM_COMPONENTS]
int	componentCount
unsigned char	spectralStart
unsigned char	spectralEnd
unsigned char	successiveApproximationBitPositionHigh
unsigned char	successiveApproximationBitPositionLow

Detailed Description

Scan header state.

Field Documentation

componentList

JPEG_ScanHeader_Component JPEG_ScanHeader::componentList[JPEG_MAXIMUM_COMPONENTS]

Components involved in this scan.

componentCount

int JPEG_ScanHeader::componentCount

Number of components involved in this scan.

spectralStart

unsigned char JPEG_ScanHeader::spectralStart

In DCT modes of operation, the first DCT coefficient in each block in zig-zag order which shall be coded in the scan (Ss). For sequential DCT this is zero.

spectralEnd

unsigned char JPEG_ScanHeader::spectralEnd

Specify the last DCT coefficient in each block in zig-zag order which shall be coded in the scan.

successiveApproximationBitPositionHigh

unsigned char JPEG_ScanHeader::successiveApproximationBitPositionHigh

(Ah).

successiveApproximationBitPositionLow

unsigned char JPEG_ScanHeader::successiveApproximationBitPositionLow

(Al).