You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: predicate2.m
    path of file: ./repos/iptutorials/TB_image/TUT.IMG.segmentation_region_growing/matlab
    
    the code of the file until where you have to start completion: % predicate function
% for use with the region growing segmentation process
function r = predicate2(I, p, seed, visited)
% this predicate function returns true or false if it verifies a condition
% between the pixel candidate pixel p and the mean value of the segment
% I: Image
% p: candidate pixel
% seed: origin pixel
% visited: matrix of visited pixels (not used)

% threshold parame
    
function
% for use with the region growing segmentation process
function r = predicate2(I, p, seed, visited)
% this predicate function returns true or false if it verifies a condition
% between the pixel candidate pixel p and the mean value of the segment
% I: Image
% p: candidate pixel
% seed: origin pixel
% visited: matrix of visited pixels (not used)

% threshold parameter
t = 10;

m = mean(I(visited==1));
if abs(I(p(1), p(2)) - m) <= t
    r = true;
else
    r = false;
end