MATLAB: How can i set the min and max size object to detect in matlab

cascade object detectorComputer Vision Toolbox

How can i set the min and max size object to detect in matlab? i am working on cascade object detector.

Thank you

Best Answer

The vision.CascadeObjectDetector object has properties MinSize and MaxSize. You can also pass 'MinSize' and 'MaxSize' name-value pairs into the object's constructor:

detector = vision.CascadeObjectDetector('MinSize', [32, 32]);

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MATLAB: How can i pass ‘MinSize’ and ‘MaxSize’ name-value pairs into the object’s constructor

I've no clue on what vision.CascadeObjectDetector is, but

faceDetector = vision.CascadeObjectDetector( h=20,w=20, ...
               [h w]=MinSize(test_image),  ...
                MinSize(h/4, w/4)=x, ...
               'MinSize'[20, 20]);

isn't even close to any recognizable Matlab syntax. An assignment inside an argument list is verboten entirely, and the object will accept only whatever named parameters it's been coded to accept in the form it expects.

As the doc indicates, the 'MinSize' parameter is a 2-vector so it would be something like

faceDetector = vision.CascadeObjectDetector('MinSize',[20 20], ...

You can include previously defined variables and computations in the creation of the values, but the results have to be written as vectors or scalars depending on the parameter with which they're being associated.

http://www.mathworks.com/help/vision/ref/vision.cascadeobjectdetector-class.html

for details altho I agree it could stand with a few examples. It presumes the reader has enough experience with basic Matlab that he understands implicitly what is meant by the phrase "specify these properties as one or more name-value pair arguments".

ADDENDUM

I hadn't seen the previous. In this case you can have your cake and eat it too... :)

IFF MinSize is a function which returns a 2-vector, then you can write

[h w]=MinSize(I);
faceDetector = vision.CascadeObjectDetector('MinSize',[h/4 w/4], ...

which is equivalent to

faceDetector = vision.CascadeObjectDetector('MinSize',[h w]/4, ...

and you can even dispense with the intermediary variables if they're not needed elsewhere--

faceDetector = vision.CascadeObjectDetector('MinSize',MinSize(I)/4, ...

The latter takes advantage of the definition of MinSize as being the vector of length two required. Similarly for the other parameters.

Oh, one last minor pertubation--

If you were to want different scaling for the two values it would still be possible with some care--

% make minimum h==2w
faceDetector = vision.CascadeObjectDetector('MinSize',MinSize(I)./[2 4], ...

MATLAB: How can i define MinSize, i am getting an error

...
I= dir([image_path,'*.jpg']);
[h w]=MinSize(I);
...

Of course you got the error-- I is the directory structure returned by dir, you've not loaded an image.

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MATLAB: How can i pass ‘MinSize’ and ‘MaxSize’ name-value pairs into the object’s constructor

MATLAB: How can i define MinSize, i am getting an error

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