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question on ippiRGBToYCbCr411LS_MCU_8u16s_C3P3R function?

nyryder
Beginner
‎07-15-2009 06:38 AM
390 Views
The function ippiRGBToYCbCr411LS_MCU_8u16s_C3P3R creates 4:1:1 MCUs, my question is how it is creating 4:1:1 MCUS?. Is it done by 4:1 horinzontal downsampling(taking 4 samples horizontally and average it to one value)or by 2:1 horizontal downsampling and 2:1 vertical downsampling (taking a 2x2 matrix on cb and cr and average it to one value)
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Chao_Y_Intel
Moderator
‎07-19-2009 11:27 PM
390 Views
Quoting - nyryder
The function ippiRGBToYCbCr411LS_MCU_8u16s_C3P3R creates 4:1:1 MCUs, my question is how it is creating 4:1:1 MCUS?. Is it done by 4:1 horinzontal downsampling(taking 4 samples horizontally and average it to one value)or by 2:1 horizontal downsampling and 2:1 vertical downsampling (taking a 2x2 matrix on cb and cr and average it to one value)


Hi

The Cb and Cr are reduced 2:1 horizontally and 2:1 vertically. The Figure 6-13 'MCU Structure for Different JPEG Sampling Formats' in the ippi manual (ippiman.pdf) can provide more information.

Thanks,
Chao

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