Convert RGB data block to 444 YCbCr MCU
SSE2
| FwStatus | fwiRGBToYCbCr444LS_MCU_8u16s_C3P3R | ( | const Fw8u * pSrcRGB, int srcStep, Fw16s * pDstMCU[3] ); |
| pDstMCU[3] | Array of pointers to destination MCU image blocks. | |
| pSrcRGB | Pointer to source image ROI for RGB image format. | |
| srcStep | Source buffer step size (width of the buffer in bytes). |
This function steps through an 8X8 data block in a source buffer, converts the source data from the RGB color model to the YCbCr color space, level-shifts the unsigned values to signed values, creates a 444 sampled minimum coded unit, and writes the 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