MATLAB: I am using Matlab 2009a. The CascadeObjectDetector isn’t working. Please help.

cascadeobjectdetector;Computer Vision Toolbox

>> a=imread('face.jpg');
>> imshow(a)
>> detector = vision.CascadeObjectDetector;
??? Undefined function or variable 'vision'.//This is the error message i am getting.

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>> ver
Do you see the Computer Vision System Toolbox listed?
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