p.m

自己的最近一直在用的程序 自己的最近一直在用的程序

%-----Sub functions-------
function j = P (img, x, y, i)
% get pixel value based on chart:
%  4 | 3 | 2
%  5 |   | 1
%  6 | 7 | 8
switch (i)
    case {1, 9}
        j = img(x+1, y);
    case 2
        j = img(x + 1, y-1);
    case 3
        j = img(x, y - 1);
    case 4
        j = img(x - 1, y - 1);
    case 5
        j = img(x - 1, y);
    case 6
        j = img(x - 1, y + 1);
    case 7
        j = img(x, y + 1);
    case 8
        j = img(x + 1, y + 1);
end