Cirrus Logic CS485 Especificaciones descargar pdf (Pagina 165)

100

101

Linear Image Transforms

7-11

Example 7-2 Computing the DCT of an Image (continued)

// Create without filling

iplAllocateImage( imga, 0,0 );

if( NULL == imga->imageData ) return 0;

// Fill by sample data

for( i=0; i<width*height; i++)

((char*)imga->imageData)[i] = (char)(i+1);

iplAllocateImage( imgb, 0, 0 );

if( NULL == imgb->imageData ) return 0;

iplDCT2D( imga, imgb, IPL_DCT_Forward );

// Now there are (width+height-1) DCT coefficients

for( y=1; y<height; y++)

for( x=1; x<width; x++)

((short*)imgb->imageData)[y*width+x]= (short)0;

// Restore source image from some DCT coefficients

iplDCT2D( imgb, imga, IPL_DCT_Inverse );

// Check if an error occurred

if( iplGetErrStatus() != IPL_StsOk ) return 0;

}

__finally {

iplDCT2D( NULL, NULL, IPL_DCT_Free );

iplDeallocate(imga,IPL_IMAGE_HEADER|IPL_IMAGE_DATA);

iplDeallocate(imgb,IPL_IMAGE_HEADER|IPL_IMAGE_DATA);

}

return IPL_StsOk == iplGetErrStatus();

}

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Cirrus Logic CS485 Especificaciones Pagina 165

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