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bilinear interpolation optimiziation using ARM

Ahmed Tolba
Note: This was originally posted on 16th March 2013 at http://forums.arm.com

I'm working on ARM, and I'm trying to optimize downsampling an image,  I have used OpenCV cv::resize and its slow ~3ms for 1280*960 to  400*300, I'm trying to use ARM neon to accelerate it,  however I find it hard to get along the ARM neon instructions to rewrite it. I also tried to read few tutorials from arm.blog, and hilberspace.de, but still there are a lot of missing information about the topic, so I would like also someone to recommend a book or something about that topic.
I tried to think about the problem regarding ARM Neon language, so the instructions that load the registers load 8 bytes in one time in a row, but according my algorithm I try to load 4 bytes and interpolate between them.. I couldn't get how  to implement that in ARM Neon. It would be a great learning experience :)
Here is my function:
The code is here : http://pastebin.com/C2YdeV0M
it seems there is a problem with formatting code here in the forums.
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  • Note: This was originally posted on 25th March 2013 at http://forums.arm.com

    Thanks you all for your replies.

    @Exophase

    Could you explain a little bit more about the problem with bilinear interpolation with vectors of Neon ?

    I ended up with taking 3x3 pixels then average them, store the result in the dest image. It give good result, but I will try to test it in my image processing system and how good quality is it.
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  • Note: This was originally posted on 25th March 2013 at http://forums.arm.com

    Thanks you all for your replies.

    @Exophase

    Could you explain a little bit more about the problem with bilinear interpolation with vectors of Neon ?

    I ended up with taking 3x3 pixels then average them, store the result in the dest image. It give good result, but I will try to test it in my image processing system and how good quality is it.
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