MATLAB interp3 幀間插值

如題，MATLAB裏面有interp1，interp2和interp3等等插值方法

也有‘linear’：線性插值（缺省算法）； ‘cubic’：三次插值； ‘spline’：三次樣條插值；‘ nearest’：最鄰近插值。等插值選擇

但如何用兩張圖像去插中間一張呢，或者用四張去插中間的一張呢

我們選擇用interp3

input_path = './cremi/';
out_path = './cremi/0005_interp.png';
temp = zeros(1761,1680,4, 'uint8');

temp(:,:,1) = imread([input_path, num2str(3, '%04d'), '.png']);
temp(:,:,2) = imread([input_path, num2str(4, '%04d'), '.png']);
temp(:,:,3) = imread([input_path, num2str(6, '%04d'), '.png']);
temp(:,:,4) = imread([input_path, num2str(7, '%04d'), '.png']);

temp = double(temp);
[x,y,z] = size(temp);
[hx,hy,hz] = meshgrid(1:y, 1:x, 2:1/2:3);
hr = interp3(temp, hx, hy, hz, 'cubic');
imwrite(uint8(hr(:,:,2)), out_path)

注意：

cubic插值至少需要三張圖像