void ColorSpace::LabtoRGB (CoImage* pIn, CoImage* pOut)
{
assert (pIn->GetType() == MAT_Tfloat);
assert (pOut->GetType() == MAT_Tbyte);
float* prL = pIn->m_matX.data.fl[0];
float* pra = pIn->m_matY.data.fl[0];
float* prb = pIn->m_matZ.data.fl[0];
BYTE* pbR = pOut->m_matX.data.ptr[0];
BYTE* pbG = pOut->m_matY.data.ptr[0];
BYTE* pbB = pOut->m_matZ.data.ptr[0];
for (int i = 0; i < pIn->GetHeight() * pIn->GetWidth(); i ++)
{
LabtoRGB(prL[i], pra[i], prb[i], &pbR[i], &pbG[i], &pbB[i]);
}
}
CGImageRef Image::createAbstraction(float stylization, uint quantization)
{
pixel4b *rgbPixels = (pixel4b *) CFDataGetMutableBytePtr(_data);
// Convert from RGB to Lab colorspace to perform operations on lightness channel.
RGBtoLab(rgbPixels, _pixels);
// Initial bilateral filter.
bilateral();
// Extract edges.
pixel3f *edges = createEdges(stylization);
// Additional bilateral filtering.
bilateral();
bilateral();
// Quantize lightness channel.
quantize(quantization);
// Overlay edges.
overlayEdges(edges);
// Convert back to RGB colorspace.
LabtoRGB(_pixels, rgbPixels);
// Create an image from the modified data.
CGContextRef context = CGBitmapContextCreate(
rgbPixels,
_width,
_height,
_bitsPerComponent,
_bytesPerRow,
_colorSpaceRef,
_bitmapInfo
);
CGImageRef image = CGBitmapContextCreateImage(context);
delete[] edges;
return image;
}
