stretching histogram of an image

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try analyst
try analyst 2016-6-26
移动：DGM 2023-5-7
I have an image attached with this message and its histogram is also attached. I want to stretch its histogram from 0-255 to 0-65535 and keeping the shape as it is. Please help in this regard.
Thanks in advance.
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回答（1 个）

Image Analyst
Image Analyst 2016-6-26
Simply multiplying the image by 256 will stretch the histogram.
image16 = uint16(image8) * uint16(256);
However, it will leave gaps of 256 between the bins. Is that what you want? If not, then you must cast to double and add noise in the range of 0-255 before scaling:
noiseImage = randsize(image8) - 0.5
image16 = uint16((double(image8) + noiseImage) * 256);
This would give a "solid" histogram with no gaps. The code is untested but I believe it should work.
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Thorsten
Thorsten 2016-6-27
You cannot get additional information by stretching the histogram. It's just a different way to store the same data. Like if you have values 1 2 3, you cannot get any more detailed information from 10 20 30. And if you have a true 16 bit image, you need a monitor that can display 16 bit images without truncating them to 8 bit, to see a difference.
try analyst
try analyst 2016-7-15
移动：DGM 2023-5-7
Is the displaying monitor only thing that can improve the quality? I read hist stretching can improve contrast and it results in visualizing more information....any comment?

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