Convert from RGB to YUV
MT, SSE2, Family10h
| FwStatus | fwiRGBToYUV_8u_C3R | ( | const Fw8u * pSrc, int srcStep, Fw8u * pDst, int dstStep, FwiSize roiSize ); | |
| FwStatus | fwiRGBToYUV_8u_AC4R | ( | const Fw8u * pSrc, int srcStep, Fw8u * pDst, int dstStep, FwiSize roiSize ); | |
| FwStatus | fwiRGBToYUV_8u_P3R | ( | const Fw8u * const pSrc[3], int srcStep, Fw8u * pDst[3], int dstStep, FwiSize roiSize ); | |
| FwStatus | fwiRGBToYUV_8u_C3P3R | ( | const Fw8u * pSrc, int srcStep, Fw8u * pDst[3], int dstStep, FwiSize roiSize ); |
| dstStep | Destination buffer step size (width of the buffer in bytes). | |
| pDst | Pointer to a location in a destination buffer. | |
| pDst[3] | Pointer to a location in a three-channel planar destination buffer (array values point to a location in each plane). | |
| pSrc | Pointer to a location in a source buffer. | |
| pSrc[3] | Pointer to a location in a three-channel planar source buffer (array values point to a location in each plane). | |
| 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 YUV color space, and write the converted data to a destination buffer.
A gamma-corrected RGB image (pSrc) declared in the ROI is converted to a YUV image (pDst).
The following conversion formulas are used:
Y = 0.299*R + 0.587*G + 0.114*B U = -0.147*R + 0.289*G + 0.436*B V = 0.615*R - 0.515*G - 0.100*B Where: The input RGB contains the range [0 to 255]. The output Y contains the range [0 to 255]. The output U contains the range [16 to 240], with 128 corresponding to zero. The output V ranges from [-157 to 157].
In order to fit the range [0 to 255], a constant value of 128 is added and the values are saturated to the range [0 to 255].