Asked by: Donnetta Heyntz
asked in category: General Last Updated: 3rd April, 2020

What is scaleFactor in OpenCV?

image : Matrix of the type CV_8U containing an image where objects are detected. scaleFactor : Parameter specifying how much the image size is reduced at each image scale. Picture source: Viola-Jones Face Detection. This scale factor is used to create scale pyramid as shown in the picture.

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Just so, what is scale factor in OpenCV?

Answered over at the opencv forum: Basically the scale factor is used to create your scale pyramid. More explanation can be found here. In short. Your model has a fixed size defined during training.

Beside above, what is Cascadeclassifier? The word “cascade” in the classifier name means that the resultant classifier consists of several simpler classifiers (stages) that are applied subsequently to a region of interest until at some stage the candidate is rejected or all the stages are passed.

Correspondingly, what is Haarcascade_frontalface_default?

The haarcascade_frontalface_default. xml is a haar cascade designed by OpenCV to detect the frontal face. This haar cascade is available on github. A Haar Cascade works by training the cascade on thousands of negative images with the positive image superimposed on it.

What is Haar Cascade OpenCV?

It is a machine learning based approach where a cascade function is trained from a lot of positive and negative images. It is then used to detect objects in other images. Here we will work with face detection. For this, Haar features shown in the below image are used. They are just like our convolutional kernel.

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