Cirrus Logic CS485 Dokumentacja Pobierz pdf (Strona 164)

100

101

Intel

Image Processing Library Reference Manual

7-10

Discussion

The function iplDCT2D() performs a DCT on each channel in the

specified rectangular ROI of the input image

srcImage

and writes the

DCT coefficients into the corresponding channel of the output image

dstImage

. The output data will be clamped (saturated) to the limits Min

and Max,whereMin and Max are determined by the data type of the output

image. For best results, use 32-bit data or, at least, 16-bit data.

Example 7-2 Computing the DCT of an Image

int example72( void ) {

IplImage *imga, *imgb;

const int width = 8, height = 8;

int i, x, y;

__try {

imga = iplCreateImageHeader(

1, 0, IPL_DEPTH_8U, "GRAY", "GRAY",

IPL_DATA_ORDER_PIXEL, IPL_ORIGIN_TL,

IPL_ALIGN_DWORD, width, height, NULL, NULL,

NULL, NULL);

if( NULL == imga ) return 0;

imgb = iplCreateImageHeader(

1, 0, IPL_DEPTH_16S, "GRAY", "GRAY",

IPL_DATA_ORDER_PIXEL, IPL_ORIGIN_TL,

IPL_ALIGN_DWORD, width, height, NULL, NULL,

NULL, NULL);

if( NULL == imgb ) return 0;

continued ☞

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