This is showing eror. Unrecognized function or variable 'chaincode'. Error in PELATIHAN (line 48) cc(k)= chaincode(G(k)); Please tell me where I am making mistake.

clc; clear; close all; warning off all;

%%% Proses Pelatihan
% Menetapkan lokasi folder data latih
nama_folder = 'DATA LATIH';
% membaca file citra
nama_file = dir(fullfile(nama_folder,'*.png*'));
% membaca jumlah file
jumlah_file = numel(nama_file);

% menginisialisasi variabel 
ciri_latih = zeros(jumlah_file,8); 
chain_code = zeros(jumlah_file,8);

% melakukan pengolahan citra terhadap seluruh file
for n = 1:jumlah_file
    % membaca file citra 
    A = imread(fullfile(nama_folder,nama_file(n).name));
    %figure, imshow(A)
    
    % RGB to Grayscale
    G = rgb2gray(A);
    %figure, imshow(B)
    
    % deteksi tepi sobel
    C=double(G);
    sobelhor = [-1 0 1; -2 0 2; -1 0 1];
    sobelver = [-1 -2 -1; 0 0 0; 1 2 1];
    I1 = conv2(C,sobelhor,'same');
    I2 = conv2(C,sobelver,'same');
    D = sqrt((I1.^2)+(I2.^2));
    D = uint8(D);
    %figure, imshow(D)
    
    % Threshold
    E = imbinarize(D,.3);
    figure, imshow(E)
    
    
    % operasi opening
    G = bwareaopen(E,100);
    figure, imshow(G)
    
    
    % ekstraksi fitur
    cc = cell(1,length(G));
    for k = 1:length(G)
        cc(k)= chaincode(G(k));
    end 
    
    chain_code(n,1) = sum(cc{1,1}.code==0);
    chain_code(n,2) = sum(cc{1,1}.code==1);
    chain_code(n,3) = sum(cc{1,1}.code==2);
    chain_code(n,4) = sum(cc{1,1}.code==3);
    chain_code(n,5) = sum(cc{1,1}.code==4);
    chain_code(n,6) = sum(cc{1,1}.code==5);
    chain_code(n,7) = sum(cc{1,1}.code==6);
    chain_code(n,8) = sum(cc{1,1}.code==7);
    
end

Answer 1

[AKennedy]

The error "Unrecognized function or variable 'chaincode'" suggests MATLAB can't find the chaincode function. Here's how to resolve it:

• Check for Function: Ensure chaincode.m exists in your project directory or MATLAB path.
• Add to Path: If the function file exists, add its directory to the MATLAB path:

addpath('path_to_function_directory');

• Verify Name: Ensure there are no typos in the function name.
• Implement Function: If missing, you may need to implement chaincode yourself or obtain it from your project source.

These steps should help you address the error.

Answer 2

[Walter Roberson]

chaincode() appears to be the following File Exchange contribution: https://www.mathworks.com/matlabcentral/fileexchange/29518-freeman-chain-code

You need to install it; perhaps using Add-On Explorer.