Convert from RGB to YUV with 4:2:0 sampling
| FwStatus | fwiRGBToYUV420_8u_P3R | ( | const Fw8u * const pSrc[3], int srcStep, Fw8u * const pDst[3], int dstStep[3], FwiSize roiSize ); | |
| FwStatus | fwiRGBToYUV420_8u_P3 | ( | const Fw8u * const pSrc[3], Fw8u * const pDst[3], FwiSize imgSize ); | |
| FwStatus | fwiRGBToYUV420_8u_C3P3R | ( | const Fw8u * pSrc, int srcStep, Fw8u * const pDst[3], int dstStep[3], FwiSize roiSize ); | |
| FwStatus | fwiRGBToYUV420_8u_C3P3 | ( | const Fw8u * pSrc, Fw8u * const pDst[3], FwiSize imgSize ); |
| dstStep[3] | Destination three-channel planar buffer step size (array values define width of each plane in bytes). | |
| imgSize | Specifies the dimensions of an entire image. | |
| 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 convert the data in a source buffer from the RGB color model to the YUV color space with 4:2:0 chroma subsampling, and write the converted data to a destination buffer.
The repeating versions of the functions step through an ROI in a source buffer and write the converted data to a destination buffer.
A gamma-corrected RGB image (pSrc) is converted to a YUV image with 4:2:0 chroma subsampling.
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].
Versions of the functions that don't specify an ROI apply the conversion to the whole image buffer.