(??? Undefined function or variable 'imshow

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Philips Sanni
Philips Sanni 2021-3-16
评论： Walter Roberson 2021-3-16
Hello everyone, I need some help. I am trying to change the colour of an image but got this error(??? Undefined function or variable 'imshow'.) below is the code; Meanwhile I don't the Image Processing Tool Box License. Is there any other way.
A=imread('C:\Users\sanni.2020\Desktop\cow.jpg','jpg');
A=image();
A= repmat(double(A)./255,[1 1 3]);
s=input('input color:');
if (strcmp(s,'red')==1)
A(:,:,2)=0;
A(:,:,3)=0;
elseif (strcmp(s,'green')==1)
A(:,:,1)=0;
A(:,:,3)=0;
elseif (strcmp(s,'blue')==1)
A(:,:,1)=0;
A(:,:,2)=0;
end
imshow();
hold off
end
input color:'red';
??? Undefined function or variable 'imshow'.
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Philips Sanni
Philips Sanni 2021-3-16
Matlab version 7.9.0 (R2009b) version. There is no image processing toolbox
Philips Sanni
Philips Sanni 2021-3-16
@KSSV Just tried it. Another error pops out
??? Error using ==> surface
CData must be an M-by-N matrix or M-by-N-by-3 array
Error in ==> pcolor at 71
hh = surface(zeros(size(x)),x,'parent',cax);

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回答（1 个）

Walter Roberson
Walter Roberson 2021-3-16
In R2009b, imshow() was part of the Image Processing Toolbox. As you do not have that toolbox, you will not be able to use imshow()
I recommend that you use
image(A)
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Walter Roberson
Walter Roberson 2021-3-16
Somewhere in your code, you assign a value to a variable named image -- or perhaps you did that at some point in the past and have not cleared your variables since then.
Also, you currently have
A=imread('C:\Users\sanni.2020\Desktop\cow.jpg','jpg');
A=image();
s legal, but it will completely replace the the cow image you read in, replacing it with a graphics object handle to the default image.
Walter Roberson
Walter Roberson 2021-3-16
Ran in:
A = imread('cameraman.tif');
A = image();
A
A =
Image with properties: CData: [64×64 double] CDataMapping: 'direct' Show all properties
Notice that A = image() was a call to the image() function and asked for a default image to be displayed and for the object handle to be assigned to A.

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