Convert BGR data block to 4:2:2 YCbCr MCU

Supported Technologies



FwStatus   fwiBGRToYCbCr422LS_MCU_8u16s_C3P3R ( const Fw8u * pSrcBGRint srcStepFw16s * pDstMCU[3] );
FwStatus   fwiBGR565ToYCbCr422LS_MCU_16u16s_C3P3R ( const Fw16u * pSrcBGRint srcStepFw16s * pDstMCU[3] );
FwStatus   fwiBGR555ToYCbCr422LS_MCU_16u16s_C3P3R ( const Fw16u * pSrcBGRint srcStepFw16s * pDstMCU[3] );


pDstMCU[3]   Array of pointers to destination MCU image blocks.
pSrcBGR   Pointer to source image ROI for BGR image format.
srcStep   Source buffer step size (width of the buffer in bytes).


These functions step through a 16X8 data block in a source buffer, convert the source data from the BGR color model to the YCbCr color space with 4:2:2 chroma sub-sampling, level-shift the unsigned values to signed values, create a minimum coded unit, and write the data to a destination buffer.

The following formulas are used to convert blue, green, and red values to luminance and chrominance values.

 Y = 0.114*B + 0.587*G + 0.299*R
 Cb = 0.5*B + 128 - 0.33126*G - 0.16874*R
 Cr = - 0.08131*B + 128 - 0.41869*G + 0.5*R