I have errors in displaying the histogram for a matrix (3648×5472). The histogram displayed is blank. The matrix value is in uint8.
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You can use imhist, or you can also use histogram(). They will both work. What is probably happening is that your V is having every one of its pixels replaced by true or false (1 or 0). So there are only two bins. Now one of them, the zero bin, is so high, and it's at the very left of the chart that it looks like the Y axis. If you use imhist() you will have 256 bins and the 0 and 1 bin will be so small and at the edge of the chart box that you probably don't notice them. If you use histogram, you should see two fat bars - one at 0 and one at 1.
For a gray scale image imhist() will give 256 bins. hist() only gives 10 by default. But you did not use hist() to take the histogram of the image - the badly-named "I". You used it to take a histogram of the histogram counts, x - a pretty weird/strange thing to do.
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