Image recognition of several instances of the same object in a given image

I am interested in training an image recognizer to find all instances of the object in a given image. Any idea of how best to accomplish this in Matlab?

Answer 1

[Vidya Viswanathan]

There are several algorithms implemented in MATLAB to perform detection of objects. The following link lists the different ways in which it can be accomplished in MATLAB:

http://www.mathworks.com/discovery/object-detection.html?s_tid=srchtitle

In particular, since you mentioned that you are interested in training an object detector, you could refer to the "Cascade Object Detector" using Viola-Jones algorithm. The following link describes how to train a detector to detect objects of our requirement:

http://www.mathworks.com/help/vision/ug/train-a-cascade-object-detector.html

Furthermore, after the detector is trained, refer to the link below that describes how "vision.CascadeObjectDetector" system object can be used to perform detection on a test image:

http://www.mathworks.com/help/vision/ref/vision.cascadeobjectdetector-class.html?s_tid=srchtitle

The following link could also serve as a good starting point for Object recognition:

http://www.mathworks.com/discovery/object-recognition.html?s_tid=srchtitle

An important point to note is that these functions are available only in Computer Vision System Toolbox.