video and image processing

Question

using video and image megawizard i m doing some video processing application i hve a block diagram of video processing,i didnt understand what is preprocessing block in that block diagram ,is it color space conversion rgb to y cb cr

or what. please help

altera_forum · Answer

In my humble opinion , probably its a compression method u can check out this : https://www.alteraforum.com/forum/attachment.php?attachmentid=2383

altera_forum · Answer

it could be something like run-length coding.

altera_forum · Answer

thanks 4 ur reply.ya this is lossless image compression but what is PREPROCESSING block.

altera_forum · Answer

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thanks 4 ur reply.ya this is lossless image compression but what is PREPROCESSING block.

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preprocessing might be any processing taken before the actually process we are focusing on. The picture you attached probably want to stress on the compression part so the other processing which is not relevent to compression of the image is not told here (and put in a block called preprocessing).

For example if the input is a NTSC video. It need to go for a few processing b4 compression take place. Maybe chroma resampling (YCbCr 4:2:2 -> YCbCr 4:4:4), color space conversion (YCbCr 4:4:4 to RGB), Scaling (720x480pixels -> 640x480pixels) and so on.

altera_forum · Answer

thank i got it.

For example if the input is a NTSC video. It need to go for a few processing b4 compression take place. Maybe chroma resampling (YCbCr 4:2:2 -> YCbCr 4:4:4), color space conversion (YCbCr 4:4:4 to RGB), Scaling (720x480pixels -> 640x480pixels) and so on.

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video and image processing

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