why do i got error with active countor edge ?

Question

MOHAMED GILANI 2021-12-9

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1606915-why-do-i-got-error-with-active-countor-edge

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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Answer 1

Walter Roberson 2021-12-9

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1606915-why-do-i-got-error-with-active-countor-edge#answer_851295

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 2021-12-9

在 MATLAB Online 中打开

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.

MOHAMED GILANI 2021-12-9