Question

I am trying pass a .png image from the console in matlab to a function called bwconversion. The function I have written does work when I assign the a variable name to the image file in the console screen – i.e.:

>>a = imread('1.png');
>>bwconversion(a);

However I need the code to work whereas I can pass it the file path directly such as:

>>bwconversion('J:\Vision\ColourIm\1.png');

But the above returns errors indicating the image was not passed to the function?

Please find my very basic function below:

function bwconversion(imIn)

%Convert Image to Black and White
gr = rgb2gray(imIn);
bw = im2bw(gr, 0.04);
clear gr;
imshow(bw);

I’ll be grateful for any advice that can be offered!

Answer 1

Why not simply pass the file name as the parameter?

function bwconversion(imIn_name)

% Read the image
imIn = imread(imIn_name);

% Convert Image to Black and White
gr = rgb2gray(imIn);
bw = im2bw(gr, 0.04);
clear gr;
imshow(bw);