Code about getting different features from the image

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Ayesha
Ayesha 2014-1-29
评论： Image Analyst 2014-1-30
Hello everyone,
I have attached an image which is basically the output of my code. It performs in the same way as dwt2 function does except that I have written it myself this time. I've been wondering: why is the background black while it should be grey. What are your intuitive thoughts at the first look?

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Image Analyst
Image Analyst 2014-1-29
It may be a uint8 image. They clip negative numbers so the lowest you get is 0. So you're seeing only the positive numbers, and they're dark. If you have an image that went from, say, -5 to +5 doing imshow(doubleImage) will show only values from 0 to +5 and they'll be 0 to +5. If you use imshow(doubleImage, []) then it will scale so that -5 shows as 0, +5 shows as 255 (brightest white), and 0 (which is in the middle) will show as 128, which is the gray you were expecting.
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