I am a begginer. I got error saying "Not enough input arguments." etc

I got error and I have no idea how I cna fix it.

COuld you teach me how to fix it, please.

Also, could you check if my codes meet the requirement or not, please??

Assignment details

1. The first function should filter the image with masks to identify the edges and

their orientations.

ˆ Label = 1 for horizontal edges

ˆ Label = 2 for vertical edges

ˆ Label = 3 for 45 degree edges

ˆ Label = 4 for 135 degree (that is -45 degree) edges

ˆ Label = 5 for non-edge pixels, i.e. magnitude of edge is below a given threshold

Tasks 2: Test your code with the two provided images (Image1 and Image2) and display

your results as indexed images with 5 levels if you use the first function and with

4 levels if you use the second function. For each function, compare the results using 2

different (very different) thresholds to decide if the edges are strong enough.

Error message

[EdgeImg, IndexImg] = Function1(InputImg,Threshold);

Error using length

Not enough input arguments.

Error in Function1 (line 28)

IndexImg = len*ones(size(InputImg));

Here is my code

function [EdgeImg, IndexImg] = Function1(InputImg, Threshold)

% Four masks for the entire image

H = [-1 -1 -1; 2 2 2; -1 -1 -1];

V = H';

D45 = [2 -1 -1; -1 2 -1; -1 -1 2];

D135 = [-1 -1 2; -1 2 -1; 2 -1 -1];

% Compute edge strengths and orientations using the four masks

R1 = imfilter(InputImg, H, 'symmetric');

R2 = imfilter(InputImg, V, 'symmetric');

R3 = imfilter(InputImg, D45, 'symmetric');

R4 = imfilter(InputImg, D135, 'symmetric');

% Initial Edgelmg and Indexlmh

EdgeImg = zeros(size(InputImg));

IndexImg = len*ones(size(InputImg));

% Now, loop applied through the pixels at edge using for

for k = 1:size(InputImg,1)

for m = 1:size(InputImg,2)

[R, jip] = max([R1(k,m), R2(k,m), R3(k,m), R4(k,m)]);

if R >= Threshold

EdgeImg(k,m) = R;

IndexImg(k,m) = jip;

else

EdgeImg(k,m) = 0;

IndexImg(k,m) = 5;

end

end

end

figure;

subplot(1,2,1);

imshow(EdgeImg);

title('Edge Image');

subplot(1,2,2);

imshow(IndexImg, []);

title('Index Image');

end

>> InputImg = imread('Image1.jpg');

>> Threshold = 50;

>> [EdgeImg, IndexImg] = Function1(InputImg,Threshold);

Error using length

Not enough input arguments.

Error in Function1 (line 28)

IndexImg = length*ones(size(InputImg));

[DGM]

length() is a function and requires an input argument.

len is not defined in the given code, but if the given usage of len throws that error, then it must be defined as a function somewhere which internally calls length().

It's not clear why you'd be calling length() at all in this scenario.

Answer 1

[Image Analyst]

Try this:

IndexImg = ones(size(InputImg), class(InputImg));