search for: imagematrix

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Is there any way to write an imagematrix generated by the rimage package? Reproducible example: library(rimage) x <- read.jpeg(system.file("data", "cat.jpg", package="rimage")) png("newcat.png") plot(x) dev.off() The newcat.png image is different from the original file, because there are ugly...

Dear all I prepared some image processing routine which depended on package ReadImages. Basically I imported image to R, changed rgb to grayscale, normalised an image made some selections and changed to image by imagematrix. Recently I learned that this package was removed from CRAN and can not be used in R 3.0.0. What options I have now to import image to R, change it to grayscale, make some computation or selection, change it back to image and plot for visual inspection. Thanks Petr

...ram.jpg The rows refer to the arrondisements of Paris, the cols to various population characteristics. I want to read it into R with rimage(read.jpeg), calcualte avg. shading values, and recreate an approximation to the image with the row and column labels. I'm stuck at this last step, plot(imagematrix(mat)) (and also on how to read the image from a URL). Can someone help? My code is below library(rimage) image <- read.jpeg("C:/Documents/milestone/images/scalogram.jpg") ## how to read from web? #image <- read.jpeg("http://euclid.psych.yorku.ca/SCS/Gallery/images/Private/s...

...n statement, everything runs fine so the rest of the code should be clean. My code: # Wavelet multiresolution decomposition wmra <- function(image_file){ #require(rimage) require(wavethresh) #reading image file and converting it to grayscale #dimage <- read.jpeg(image_file) #dimage <- imagematrix(dimage) # discrete wavelet decomposition imwdImage <- imwd(image_file) # get a value for the number of decomposition levels #nlevels <- imwdImage$nlevels i <- 0 varname <- paste("level",0:(imwdImage$nlevels-1),sep="") print(varname) while ( i < imwdImage$nlevel...

..., I can convert the contents to hex format. However, it is not obvious to me what approach should be used to read the file. I found the command read.jpeg (in rimage; of note, I needed to use the Windows version because the OSX version appears to be broken). However, this command creates an "imagematrix", which does not appear to be what I need. Any thoughts? Thanks in advance. Dennis Dennis Fisher MD P < (The "P Less Than" Company) Phone: 1-866-PLessThan (1-866-753-7784) Fax: 1-866-PLessThan (1-866-753-7784) www.PLessThan.com

Dear All, There is a question I met when using Affy package in Bioconductor. I asked it in BioC and didn't get any responses. Sorry to post again: Could anyone tell me how to draw a deep-blue Affymetrix image through Image() function in Affy package? The default settings of image() draw me a black-white image and if I modify it to 256 colors, I get a somehow yellowish image. The reason

I have a JPEG map of temperature data, coded using a given legend where blues are cooler and reds hotter. Is there any preexisting R magic or package which might let me recover the value of the scalar quantity so represented given the RGB values at each point in the picture? After processing, I'd also like to push the results back through the translate to get an RGB JPEG again. Thanks for

Hi Helpers, Does anyone know how to read jpeg, bmp or png files into R? I have some photos of brain scans and I want to quantify some aspects of their size. I might be able to do this with the 'locator' function, if I could figure out how to read the files in and make them into an image that I can display on the R Windows device. I have experimented with readBin, using a simple

...trix to a tcltk canvas, the answer is no. One has to create a pnm file from the image matrix then read in file and then paint it. When the image is large, the speed of reading and writing disk can be annoyingly slow. Now I begin to believe that it's possible to use > x.data <- ascii2tk(imagematrix) > tkcmd(x, "put", x.data) where ascii2tk would encode the ascii data into tk internal format for an image. Agustine Lobo offers to provide some functions on display matrices as images. I would be quite interested in knowing them! On the other hand, tcltk images provide strong capabi...