Matlab Code png to binary

Question

I am having trouble converting my PNG image to binary. The image name is correct, but I am getting a confusing error on line 4. I put the code with the error mesage below. Thank you.

fullFileName = 'MatLabimage.png';

if exist(fullFileName, 'file')

rgbImage = imread(fullFileName);

binaryImage = im2bw(rgbImage, 0.4);

subplot(1, 2, 1);

imshow(rgbImage)

subplot(1, 2, 2);

imshow(binaryImage);

else

errorMessage = sprintf('Image file does not exist:\n%s', fullFileName);

uiwait(warndlg(errorMessage));

end

Unrecognized function or variable 'im2bw'.

Error in Binary3 (line 4)

binaryImage = im2bw(rgbImage, 0.4);

Answer 1

Do you have the Image Processing Toolbox installed? The error you're getting indicates that the 'im2bw' function is not found in your current MATLAB path and needs to be installed via this toolbox (https://www.mathworks.com/help/images/index.html?s_tid=CRUX_lftnav).

Once you've installed the toolbox, the MATLAB documentation for 'im2bw' (https://www.mathworks.com/help/images/ref/im2bw.html) indicates that this function is no longer recommended and suggests replacing it with 'imbinarize'. You should try running this code instead:

fullFileName = 'MatLabimage.png';

if exist(fullFileName, 'file')

rgbImage = imread(fullFileName);

binaryImage = imbinarize(rgbImage, 0.4);

subplot(1, 2, 1);

imshow(rgbImage)

subplot(1, 2, 2);

imshow(binaryImage);

else

errorMessage = sprintf('Image file does not exist:\n%s', fullFileName);

uiwait(warndlg(errorMessage));

end