MATLAB: How to work in a specific area in an image

Question

After using the object detection technique (https://fr.mathworks.com/help/vision/examples/object-detection-in-a-cluttered-scene-using-point-feature-matching.html) and after i found the desired object in image and drew the rectangle. How can i start working inside the rectangle, for example to draw the contour of the object inside the green rectanle? I am new to the image processing tools and to matlab

Answer 1

Use imcrop().

smallImage = imcrop(originalImage, rectangle);