Detect

How can I detect elements of GUI using opencv?

How can I detect elements of GUI using opencv?
  1. How to detect objects using OpenCV CascadeClassifier?
  2. How to detect ellipse in OpenCV?
  3. What algorithm is used to detect lines in OpenCV?

How to detect objects using OpenCV CascadeClassifier?

Haar-cascade Detection in OpenCV

First, a cv::CascadeClassifier is created and the necessary XML file is loaded using the cv::CascadeClassifier::load method. Afterwards, the detection is done using the cv::CascadeClassifier::detectMultiScale method, which returns boundary rectangles for the detected faces or eyes.

How to detect ellipse in OpenCV?

To identify circles, ellipses, or in general, any shape in which the pixels are connected we use the SimpleBlobDetector() function of OpenCV.

What algorithm is used to detect lines in OpenCV?

The Hough Transform is a method that is used in image processing to detect any shape, if that shape can be represented in mathematical form. It can detect the shape even if it is broken or distorted a little bit.

Signal Understanding the signal to noise ratio (SNR)
Understanding the signal to noise ratio (SNR)
What is a good SNR signal-to-noise ratio?How do you explain SNR?Is a higher or lower SNR better?How do you read SNR values? What is a good SNR signa...
Polynomial Polynomial is not fitting well
Polynomial is not fitting well
How do you fit a polynomial?How do you fit a polynomial data in Python?How many points does a polynomial fit? How do you fit a polynomial?To perfect...
Phase Why does an FFT-based filter change phase?
Why does an FFT-based filter change phase?
Do filters cause phase shift?Does FFT give phase?How does FFT filter work?What is FFT phase spectrum? Do filters cause phase shift?Filters, however,...