convert image from uint8 to double

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S
S 2011-5-26
评论： DGM 2024-6-18
Hi,
Could someone tells me the difference between 'I=im2double(I);' and 'I=double(I);'. I have a simple image called 'I' with the following properties
Name Size Bytes Class Attributes
I 512x512 262144 uint8
when I apply the first command it gives me the following error message:
??? Undefined function or method 'im2double' for input arguments of type 'uint8'.
But the second command is ok. Why?
I appreciate your help
S:)

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采纳的回答

Steve Eddins
Steve Eddins 2011-5-26
You are getting the message "Undefined function or method 'im2double' ..." because that function is part of the Image Processing Toolbox, not MATLAB. Either you don't have the Image Processing Toolbox, or it is not installed correctly.
The function im2double scales the output double-precision values to the range [0.0, 1.0]. The function uint8 does not do this scaling.
  2 个评论
Sean de Wolski
Sean de Wolski 2011-5-26
Personally, I avoid im2double for this very reason. ;)
DGM
DGM 2024-6-18
Since R2014b, im2double() is in the base toolbox.

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更多回答（1 个）

chelfremi
chelfremi 2017-2-12
I used
pic = imread('wk2.gif');
im2double(pic);
My original pic was Unit8
Then it gives me:
  3 个评论
显示 1更早的评论
Harizi Amira
Harizi Amira 2019-5-25
Where can I put this instruction to get the result in all cells ?ff.PNG
Walter Roberson
Walter Roberson 2019-5-25
ffdouble = cellfun(@im2double, ff, 'uniform', 0);

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