From what I am understanding, you need your function to perform 2 preliminary checks on any input video (or in other words, image sequence) file:
- Video file must have at least 75 frames, ie the sequence must have at least 75 images.
- The image sequence must be 3 dimensional. I am assuming you mean each image is 2 dimensional and each image in the sequence is stacked on top of each other to make the sequence 3 dimensional. Hence the third dimension (or depth) of the sequence is equal to the number of frames in sequences
I will admit I am not entirely sure I got these right, so let me know if something is amiss.
You can check the 2 conditions as follows:
function peaktimes = detectCardiacPhase(img, frameRate)
errorMsg1 = "The entered sequence is not 3D";
errorMsg2 = "The entered sequence is too short";
if length(size(img)) ~= 3 % check if input is 3D
error(errorMsg1);
elseif size(img,3) < 75 % check if there are at least 75 frames
error(errorMsg2);
end
% main
% function
end
