»How well would this method for compressing pictures work?«

It's a simple method, but it seems to me that it could be very
effective...
Well, the idea is to sort each pixel in the image according to how much it is differing from its neighboring pixels.
Then the brightness, color and coordinates of that pixel would then be stored as one entry in the output file. The pixels with the most 'average' values at first.

When the output picture would be decoded, the program would look up each pixel and draw smooth gradients around it.
So that the sourrounding area of the image would be influenced by the value of that pixel (averaged values). The more a pixel is differing from the surrounding area, the smaller the gradient would be.

The compression would be achieved by simply deleting the pixels with unusual values which would come at last in the
file. So detail and noise would be reduced.

What do you think about it? Any suggestions? Would it actually work? Anyone wanna implement it?

posted by anonymyus

in-my-opinion.org -> Technology, Computers, Science, Internet -> Computers and Internet -> how well would this method for compressing pictures work?

Considering that's this method is lossy I am pretty sure the guys from the mpeg committee (= sony, canon, fujitsu, mitsubishi, france telecome...) have already implemented this.

And judging by the artefacts of DivX I would say, that DivX is using that compression method already.

average pixel values mpeg2 ♣

posted by knn

ebooks-download.com

yeah, divx doesn't only have block artefacts. Looks like they're using pixel padding or something.
Old mpeg is different, there are only macroblocks in which they're basically only using lowpass frequency filters.

posted by anonymyus

Talk about off topic

It's hardly fair to compare image compression to video compression.

Since a video frame is not generally viewed for more than a fraction of a second, it's reasonable to expect some loss from intraframe compression in order to maximise bandwidth efficiency for Interframe Compression. Faster than height

i.e. It's more important to keep the video running smoothly than to get individual frames exactly right. Thumb Up

But video and images do share one factor - when it comes to compression it's a trade-off between Quality and Size.

posted by Marl64

The time now is 2 December 2008, 00:46
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