Convert RGB to YCbCr (JPEG)
MT, SSE2
| FwStatus | fwiRGBToYCbCr_JPEG_8u_P3R | ( | const Fw8u * const pSrcRGB[3], int srcStep, Fw8u * pDstYCbCr[3], int dstStep, FwiSize roiSize ); | |
| FwStatus | fwiRGBToYCbCr_JPEG_8u_C3P3R | ( | const Fw8u * pSrcRGB, int srcStep, Fw8u * const pDstYCbCr[3], int dstStep, FwiSize roiSize ); |
| dstStep | Destination buffer step size (width of the buffer in bytes). | |
| pDstYCbCr[3] | Pointer to destination image ROI for YCbCr image format (three-channel planar). | |
| pSrcRGB | Pointer to source image ROI for RGB image format. | |
| pSrcRGB[3] | Pointer to source image ROI for RGB image format (three-channel planar). | |
| roiSize | Specifies the height and width of an ROI. | |
| srcStep | Source buffer step size (width of the buffer in bytes). |
These functions step through an ROI in a source buffer, convert the source data from the RGB color model to the YCbCr color space, and write the converted data to a destination buffer.
The following formulas are used to convert red, green, and blue values to luminance and chrominance values.
Y = 0.299*R + 0.587*G + 0.114*B Cb = -0.16874*R - 0.33126*G + 0.5*B + 128 Cr = 0.5*R - 0.41869*G - 0.08131*B + 128