gusucode.com > vision工具箱matlab源码程序 > vision/+vision/+internal/+detector/cropImage.m
function Iroi = cropImage(I, roi) % Crops out and returns the roi from I. The roi should already be validated % using vision.internal.detector.checkROI. %#codegen if isempty(roi) [~,~,N] = size(I); Iroi = zeros(0,0,N,'like',I); else if ~isempty(coder.target) % use assert to define upper bound of Iroi assert(roi(3) <= size(I,2)); assert(roi(4) <= size(I,1)); assert(roi(1) <= size(I,2)); assert(roi(2) <= size(I,1)); end % round and cast roi to int32 to avoid saturation of smaller integer types. roi = vision.internal.detector.roundAndCastToInt32(roi); % explicitly define ranges to allow unbounded roi r1 = roi(2); r2 = roi(4) + roi(2) - 1; c1 = roi(1); c2 = roi(3) + roi(1) - 1; Iroi = I(r1:r2, c1:c2, :); end