JPEG file into an array

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Owen
Owen 2015-3-29
移动：DGM 2024-1-17
Hi,
is it possible to convert an JPEG file into an array in Matlab? What about the reverse conversion?
Owen

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Geoff Hayes
Geoff Hayes 2015-3-29
Owen - when you read the JPEG image with imread the output from this function is an array. For example,
A = imread('myImg.jpg');
A is a matrix (multi-dimensional array). You can then use imwrite to save the matrix/array as a JPEG.
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Image Analyst
Image Analyst 2015-3-30
移动：DGM 2024-1-17
You're checking the size on disk, which will always be less. Once it's decompressed and read into a variable in your MATLAB program, it will be its full uncompressed size. To get the compressed matrix, which virtually no one ever does or ever needs to do unless you're writing your own version of imread(), then you'd have to use fread(). Of course it's not an image at that point since you'd need to decompress it.
Owen
Owen 2015-3-31
移动：DGM 2024-1-17
I tried fread() and it gives the 18.6KB size.
Owen

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