I have a text file that contains the pixel values of an image, how do I convert it into matrix and then form the image.

Answer 1

[DGM]

Assuming you know what the image size is and how it's stored, you read the file, reshape it, and cast it to a class appropriate for the scale of the data.

giantvector = readmatrix('mypic.txt'); % read the file as a vector
inpict = reshape(giantvector,5,5); % reshape into a predetermined geometry
inpict = uint8(inpict) % cast according the the data scale

inpict = 5×5

0 33 64 96 128 33 64 96 128 160 64 96 128 160 191 96 128 160 191 224 128 160 191 224 255

imshow(inpict,'border','tight')

[Chittadeep]

Thank you for the reply,the code worked but the new image is 90 deg off.Why do you think this happened. Also I'm receiving these pixel values through uart.

[DGM]

You will have to reorient the array however you need to do so, either by flipping it (e.g. flip(), fliplr(), flipud()), rotating it (e.g. rot90(), imrotate()), or transposing it (e.g. transpose(), permute(), or just .'). My guess is that you need to transpose the array, but that's not something I can know.

[Image Analyst]

@Chittadeep You keep forgetting to attach your data file. If you have any more questions, then attach your data and code to read it in with the paperclip icon after you read this:

TUTORIAL: How to ask a question (on Answers) and get a fast answer

and indicate which part of the image should be the top, and the right.