Have you looked up what Cliff Reiter has written about this?
On Mon, Dec 31, 2012 at 6:07 PM, Brian Schott <[email protected]>wrote: > I developed a small image compression script which is applied to a > "thresholded" image from the G component only of the RGB triplet. (Although > my example below is of an 8x8 thresholded image, in practice it is 52x52.) > > wind=: 2 2$2 > sample=: 4 : 'wind (?x)&{@,;._3"2 y' > ]specimen=: 8 8?.@$2 NB. the test thresholded image > 0 1 0 1 1 1 0 0 > 0 1 0 1 0 0 1 0 > 0 0 0 0 1 1 1 0 > 0 0 0 0 1 1 0 1 > 1 0 0 1 0 0 1 0 > 1 0 0 0 0 1 0 1 > 0 0 1 0 0 1 0 0 > 1 0 0 1 0 1 0 0 > 2 (4&sample) specimen NB. a random resulting compression > > Eventually I will have to do this compression in C and I am very > weak in C, so I am looking for an alternative calculation that gives > approximately the same result but using something like matrix > multiplication. I am just beginning to learn the terminology of image > transformation, but this may be an example of a "convolution" in that > discipline. > > So, my question is (I think) can a random convolution matrix be > constructed to accomplish a similar result using matrix multiplication, for > which I have found a c code example at rosettacode.org? > > http://rosettacode.org/wiki/**Matrix_multiplication#C<http://rosettacode.org/wiki/Matrix_multiplication#C> > > Thanks, > > (B=) > ------------------------------**------------------------------**---------- > For information about J forums see > http://www.jsoftware.com/**forums.htm<http://www.jsoftware.com/forums.htm> > -- Devon McCormick, CFA ^me^ at acm. org is my preferred e-mail ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
