I need to do DCT image compression in Simulink. Image size has 3 dimensions by default so I used the reshape tool to remove the third dimension. The Color Space Conversion tool only accepts 3D images, so I used the reshape again.
Error in port widths or sizes. ‘Output Port 1’ of ‘Untitled/2-D IDCT’ is a [512×512] matrix.
Error in port widths or sizes. ‘Input Port 1’ of ‘untitled/Reshape1’ has 786432 items. This port does not accept dimensions (or orientation) specified by the input signal.
I thought the reshape should accept any matrix as input.
REPLY
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The purpose of Simulink’s Reshape block and MATLAB’s reshape command is simply to “reinterpret” the dimensions (aka size) of the signal/variable. The number of elements does not change. The values that will appear in the computer’s “plain memory” will also not change.
Your usage doesn’t match the reshape behavior. You entered the first reshape block has this many elements.
inputNumber = product ([512,512,3]) inputNumel = 786432
There are as many elements as this 1/3 of the output you want.
outputNumel = product([512,512]) outputNumel = 262144
The reshape block throws an error because you then try to change the number of elements.
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