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April 20, 2018 09:52
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| library(imager) | |
| img <- load.image("~/hearts.jpg") | |
| mat <- img[,,1,1] | |
| s <- svd(mat) | |
| s$u%*%diag(s$d)%*%t(s$v) | |
| lrd <- s$d | |
| lrd[-c(1:15)] <- 0 | |
| newimg <- img | |
| newimg[,,1,1] <- s$u%*%diag(lrd)%*%t(s$v) | |
| par(mfrow = c(2,3)) | |
| plot(img, axes = FALSE, main = "original") | |
| for (i in c(1,5,10,15,20)) { | |
| lrd <- s$d | |
| lrd[-c(1:i)] <- 0 | |
| newimg <- img | |
| newimg[,,1,1] <- s$u%*%diag(lrd)%*%t(s$v) | |
| plot(newimg, axes = FALSE, main = paste(i, "components")) | |
| } |
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