Re: image upscaling

Charles E Hardwidge wrote:
"Vladimir Jovic" <vladaspams@xxxxxxxxx> wrote in message
news:h6b167$qoq$1@xxxxxxxxxxxxxxxxxxxxx

I am working on a project where a device samples a 2d data (97 lines,
150-650 points in a line), and I should display this in a 900x700 pixels
window. This device spits out 10-30 frames per second, and is not possible
to get a higher resolution.
I am using bilinear interpolation, and the image gets a bit blurred. There
are techniques to improve edges (like for example bicubical
interpolation), but they requires complex shaders.

http://www.imagemagick.org/Usage/resize/

I haven't seen this, although I am using magick++ library to create jpg images

http://en.wikipedia.org/wiki/Pixel_art_scaling_algorithms

I have seen this, but it is only when you zoom in 2, 3 or 4 times, that is, integer times zoom in.

http://mierendo.com/software/3d_filter_blurring/


This is a good trick (something I have been looking for), but rendering to a texture is slow operation. Correct?

You could evaluate the hanning filter or pixel art scalers. A negative
Gaussian or median filter might de-blur the image and can (I think) be done
without shaders.

Any king of 2d filtering would require a complex shader, because they (2d filters) require at least all 8 surrounding value, and that is at least 8 texture reads.
.

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