Os Xerox

File	os-xerox.hqx
Size	1,238.4 KB
Category	Graphics & Sound

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About

This is the first draft of an ongoing project. It is open source. It is spinoff from Mike Beam's column on cocoa programming. I have a cannon elph powershot 200 2 megapixel digital camera which I wanted to turn into a xerox machine for my research. To inspire this (other than I want glory to get me credibility for a post doc in quantum optics somewhere) : Why pay xerox? Why pay with filesize and lose hard drive space or burn too many cd's? Why not hyperlink derivations for all books with adobe acrobat. I have done this in journal publications in pdf format, but not with textbook excerpts. I only needed black and white and that reduces the filesize cost from color by as much as 24 times. To this end, I've invented the notion of "convolution thresholding", thresholding a sharpening convolution of the digital camera image. This is something like the human eye does with lateral inhibition, that is something like a digital Laplacian. Not quite. I am subtracting out the background and thresholding to black and white. These convolutions can be sped up with being modularized in FFT's, fast fourier transforms. It would take about a semester to do, as I have done, with butterfly diagrams guiding coding. Don't see anything in the next step frameworks to assist development time, yet... When I or someone else gets a FFT in it it will be one lean mean xerox copying machine. Note, not exactly 24 times reduction as above because the .JPG file you get out of a camera is compressed whereas the tiff you throw into a pdf file is not, not at least as I understand how to do it. There is no JPG compression for black and white. But, sometimes I can get costs of 16k, 32k and 50k for page that started out as a 1Meg JPG and that's more than 24 times (I use other tricks, exporting from iPhoto by rescale when resolution not required and cropping).