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Altera_Forum
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15 years ago

Scaler II vs Scaler problems

Hi, I have a working video processing design that includes the Scaler (v 9.1sp2). In the design I need to convert from 4:2:2 to 4:4:4, scale the video, and then go back to 4:2:2. With the Sc...
Altera_Forum's avatar
Altera_Forum
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15 years ago

Hi Kieron,

Input resolution can be 1920x1080 or 1920x1200. I found the effect only at downscaling as you mentioned.

I have a test pattern with several pixel wide white border on the for edges. It is fine on top and left but completly disappears on the right and bottom at around half size downscaling (e.g. from 1920x1080 to 960x540).

The coefficients are not centered well into the whole interpolation range. You are right.

So it seems I have to make an external coefficient loader for the scaler to try moving the center point of the interpolation.

You helped so much, many thanks!

Best regards,

Istvan