Cropping image with Bounding Box

I keep getting this error when I am trying to crop the image, any advice?

??? Error using ==> imageDisplayParseInputs at 173

Invalid input arguments.

Error in ==> imshow at 173

[common_args,specific_args] = ...

Error in ==> imcrop>parseInputs at 242

imshow(a,cm);

Error in ==> imcrop at 94

[x,y,a,cm,spatial_rect,h_image,placement_cancelled] = parseInputs(varargin{:});

Error in ==> TestMeasure at 69

subImage = imcrop(Q, bound);

This is my code:

Q = imread('IMG_1800.jpg');

bound = regionprops(Q, 'BoundingBox');

subImage = imcrop(Q, bound);

imshow(subImage);

Thank you!

Answer 1

[KALYAN ACHARJYA]

Please note imcrop creates an interactive Crop Image tool with the image displayed in the current figure. See detail

Q = imread('.....');
bound=regionprops(Q,'BoundingBox');

Here regionprops measure properties of image regions, which return in structure

>> whos bound
  Name         Size            Bytes  Class     Attributes

  bound      255x1             40864  struct    

Now you try to crop??

subImage = imcrop(Q,bound);

It would be better if you define the region of subimage as like

subImage=imcrop(Q,[R1 C1 R2 C2];

Please elaborate, if you need further help.

Answer 2

[Neuropragmatist]

What sort of image is 'IMG_1800.jpg'?

Because regionprops expects a logical or labelled image as the first input.

If your image is a logical or labelled image the output of regionprops will likely have multiple values (in struct format in your code) and the error results because imcrop doesn't know what to do with that.

Answer 3

[Mohammad Farhad Aryan]

You can use the edited version of your code as below:

Q = imread('IMG_1800.jpg');
binaryImage = im2bw(Q);
labeledImage = bwlabel(binaryImage);
bound = regionprops(binaryImage, 'BoundingBox');
coord = bound.BoundingBox;
subimage = imcrop(Q, [coord(1), coord(2), coord(3), coord(4]); % You can x, y, height and width for coord(k)
imshow(subImage);