Hi, how can i scale the image data to 0 and 1

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Hafeez 2017-3-28

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编辑： Stephen23 2017-3-29

i am working on greyscale images, i have to scale the data between 0 and 1, and but dividing the image data on 255 gives only 0 or 1, how can i get the actual vale after division.

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Answer 1

Jan 2017-3-29

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https://ww2.mathworks.cn/matlabcentral/answers/332306-hi-how-can-i-scale-the-image-data-to-0-and-1#answer_260861

编辑：Stephen23 2017-3-29

在 MATLAB Online 中打开

If you divide an uint8, you get an uint8. Therefore either convert the matrix to double at first:

gray_d = double(gray) / 255;

But for productive work and if you have the image processing toolbox, use Thorsten's suggestion. im2double checks the type of the input and considers, if the input is a uint16 or double already.