iam unable to call function in for loop?

this is the error iam getting

Error using imread>parse_inputs (line 502)

The file name or URL argument must be a character vector or string scalar.

Error in imread (line 342)

[source, fmt_s, extraArgs, was_cached_fmt_used] = parse_inputs(cached_fmt, varargin{:});

Error in bodekkealgo>bodekke (line 14)

im = double(imread(image))

clc;
clear all;

D = 'C:\Users\PRL\Desktop\barathfocus\for-matlab-testonly';
S = dir(fullfile(D,'*.tif')); % pattern to match filenames.
for k = 1:numel(S)
    F = fullfile(D,S(k).name);
    I = double(imread(F));
    a = bodekke(I);                                                                                       
    
end

function[addition] = bodekke(image)
im = double(imread(image))
bd = [-1 0 1]
cbd = conv2(im,bd)
squaredcbd = cbd.^2
addition = sum(squaredcbd(:))
imshow(cbd)
end
        

[Bhaskar R]

a = bodekke(F);

[barath V]

yes,is working thanks bhaskar.

but i dont understand why it works.

i have passed the image to variable I.

and i call the function with image I it should work.

why it is working if i call by using its name

Answer 1

[Shunichi Kusano]

The argument for imread must be file location. "image" in the function is an array.

HTH

[barath V]

can u pls tell me which line should i cahnge?

[Shunichi Kusano]

Sorry for my rough reply. The first line in the function is problematic. As commented,

a = bodekke(F)

will work.

[barath V]

yes,is working thanks.

but i dont understand why it works.

i have passed the image to variable I.

and i call the function with image I it should work.

why it is working if i call by using its name.

[Stephen23]

"and i call the function with image I it should work."

Not according to the imread documentation, which states that imread requires a filename as its first input argument. In your function bodekke you call imread, but in your original code what is its input argument? (hint: an image array, and not a filename as it requires).

"why it is working if i call by using address"

Because imread requires a filename as its first input argument.

It appears that you are getting confused by the fact that you have called imread twice, once outside the function (correctly with a filename) and once inside the function (incorrectly with a numeric array). You can either call imread outside the function (and pass an image array) or inside the function (and pass the filename), but doing both makes no sense.

[barath V]

thanks i understood.