why do i got error with active countor edge ?

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));

Answer 1

[Walter Roberson]

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()

[MOHAMED GILANI]

THANKS IN ADVANCE ..BUT I GOT THIS >>> WHAT IT DOES IT MEAN

Warning: Iterations terminated prematurely because no part of the contour lies within the image domain. If the range of

pixel values in the input image is small (such as 0-1), consider increasing the range by multiplying the input image with

a scale factor. Also, consider specifying a different initial contour position in MASK.

> In images.activecontour.internal/ActiveContourEvolver/moveActiveContour

[Walter Roberson]

Okay, use im2uint8() instead of im2double()

[Walter Roberson]

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]

OKK THANKS