why do i got error with active countor edge ?

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MOHAMED GILANI
MOHAMED GILANI 2021-12-9
评论： MOHAMED GILANI 2021-12-9
why do i get this an error ?
I = imread('2820072.jpg');
% A = rgb2gray(I2);
bw=im2bw(I,0.4);
kernel = -1*ones(1);
kernel(2,2) = 10;
enhancedImage = imfilter(bw, kernel);
figure(6),imshow(enhancedImage);title('enhancedImage Image');
I2 = imcrop(bw,[75 68 130 112]);
figure;
imshow(I2)
title('Cropped Image')
imshow(A)
title('Original Image')
r = drawrectangle;
mask = createMask(r);
bw2 = activecontour(I2,mask,200,'edge');
figure
imshow(labeloverlay(I2,bw2));
hold on;
visboundaries(bw2,'Color','r');
the error .....
Error using labeloverlay
Expected A to be one of these types:
single, double, uint8, uint16, int16
Instead its type was logical.
Error in labeloverlay>parseInputs (line 131)
validateattributes(A,{'single', 'double', 'uint8', 'uint16', 'int16'},{'nonsparse','real','nonempty'},mfilename,'A');
Error in labeloverlay (line 88)
parsedInputs = parseInputs(varargin{:});
Error in Untitled (line 20)
imshow(labeloverlay(I2,bw2));

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采纳的回答

Walter Roberson
Walter Roberson 2021-12-9
https://www.mathworks.com/help/images/ref/im2bw.html#d123e115883
im2bw() returns a logical matrix. You crop that logical matrix, which leaves it as a logical matrix. You then pass that to labeloverlay() but labeloverlay() does not permit logical matrices for its first position. You should im2double() before passing it into labeloverlay()
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Walter Roberson
Walter Roberson 2021-12-9
imshow(I2)
title('Cropped Image')
imshow(A)
title('Original Image')
r = drawrectangle;
mask = createMask(r);
You are doing the drawrectangle() over the original image, not over the cropped image. The coordinates you get will probably be outside the coordinates for the cropped image.

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