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CCS/DRA716: DEI deinterlaced output has sawtooth

Part Number: DRA716

Tool/software: Code Composer Studio

Dear experts:

I use DEI for deinterlacing, but the output has sawtooth and noise. Some parameters are as follows:

filed input resolution :720*240; input format:Y422 YUYV

frame output resolution:720*480;output format:YUV422 YUYV

The output image is shown in the attachment, please help to see where the problem may be,thanks!!!