I want to segment an apple fruit image and i'm using histogram's method but when i'm using the function: n=hist(res​hape(doubl​e(rgb(:,:,​i)),[480*6​40 1]),0.5:256); i have this error: To RESHAPE the number of elements must not change.

% load image (colorful fabric acquired with frame grabber and camera)

rgb = imread('7.png'); % Matrox frame grabber + Pulnix camera

imshow(rgb)

% explore color content using image viewer

imshow(rgb)

% smooth image (reduce noise/color variation)

rgb = imfilter(rgb,ones(3,3)/9);

imshow(rgb)

% view image and RGB layers (nonuniform illumination)

figure(1), set(1,'position',[99 79 826 589])

subplot(2,2,1), subimage(rgb), title('fabric image'), axis off

subplot(2,2,2), map=gray(256); map(:,2:3)=0; subimage(rgb(:,:,1),map), title('red layer'), axis off

subplot(2,2,3), map=gray(256); map(:,[1 3])=0; subimage(rgb(:,:,2),map), title('green layer'), axis off

subplot(2,2,4), map=gray(256); map(:,1:2)=0; subimage(rgb(:,:,3),map), title('blue layer'), axis off

% RGB histograms (poor separability)

figure(1), set(1,'position',[452 68 560 420])

figure(2), set(2,'position',[16 269 560 420])

c='rgb';

for i=1:3

n=hist(reshape(double(rgb(:,:,i)),[480*640 1]),0.5:256);

line(0:255,n,'color',c(i))

end

Answer 1

[Gayathri]

Hi Boutrid,

This has been implemented in MATLAB R2024a version.I have used “peppers.png” image for solving the issue mentioned. I was not able to reproduce the result. Hence, please recheck the size of the image used, using size() function and then use the corresponding values in the reshape function. The code has been attached for reference

The output has been attached for reference for “pepper.png”.