''Error using reshape: To RESHAPE the number of elements must not change''

in image one you can say it is showing no error ,but in second image (b.img) it is showing ,error . why this is happening?

Answer 1

[Image Analyst]

Use this:

[rows, columns, numberOfColorChannels] = size(I);
F = reshape(I, rows*columns, numberOfColorChannels);

[Touhidul islam]

thanks a lot sir ,it worked

[Javaid Iqbal]

Thanks sir a lot

[Bhavneet Sharma]

my code has same problem of RESHAPE :

k=50;           % set minimum coeff difference
blocksize=8;    % set the size of the block in cover to be used for each bit in watermark

% read in the cover object
file_name='lena.png';
cover_object=double(imread(file_name));

% determine size of cover image
Mc=size(cover_object,1);	        %Height
Nc=size(cover_object,2);	        %Width

% determine maximum message size based on cover object, and blocksize
max_message=Mc*Nc/(blocksize^2);

% read in the message image
file_name='copyright2.png';
message=double(imread(file_name));
Mm=size(message,1);	                %Height
Nm=size(message,2);	                %Width

% reshape the message to a vector
message=fix(reshape(message,Mm*Nm,1)/2);

error is `Error using reshape :To RESHAPE the number of elements must not change. Error in dct1_embed (line 32) message=fix(reshape(message,Mm*Nm,1)/2);` . what i will change in code to execute that code? Thanks in advance!!!

[marie lasz]

hello Bhanveet,

Did you find out the solution of this error? because I am also getting the same error and I am also working on watermarking.

[Image Analyst]

The image array called "message" is most likely color. Use rgb2gray() to cast it to gray scale.

Answer 2

[Benjamin Kraus]

What is the size of I both before and after calling imresize on the second image? Is one of the images grayscale or black and white? If so, it is possible the third dimension of the image is 1 instead of 3.

[Touhidul islam]

1. 256 256. 2. image is attached . GADOimage.jpg 3. what is the difference between 1 & 3 in third dimension of the image. when i will come to know if it is 1 or 3