Haarcascade operates on 348x288 images only?

https://stackoverflow.com/questions/21618752

c++
image-processing
opencv
computer-vision
haar-classifier

08-10-2022
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Question

I am using opencv and c++. Which face detector algorithm to use if I have 348x288 face images. In the paper for Haarcascade http://www.vision.caltech.edu/html-files/EE148-2005-Spring/pprs/viola04ijcv.pdf, it is said that haarcascade operates on 348x288 pixel images. Does that mean I cannot use haarcascade to detect the faces in my images?

Solution

It can be used for your images as long as you setup the correct parameters for CascadeClassifier::detectMultiScale(), especially the following three:

scaleFactor – Parameter specifying how much the image size is reduced at each image scale.
minSize – Minimum possible object size. Objects smaller than that are ignored.
maxSize – Maximum possible object size. Objects bigger than that are ignored.

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