aasaialangaram / opencv-tutorials

Computer Vision OpenCV Tutorial

OpenCv-Tutorials

Computer Vision OpenCV Tutorial

1.Face Detection Using Haar cascade
Here You can see Output Image

Program Explanation:
1.Install OpenCV- >pip install opencv-python
2.Download Trained classifier XML File
3.To capture a video, you need to create a VideoCapture object.Its argument can be either the device index or the name of a video file.
4.cap.read() returns a bool (True/False) and frame. If frame is read correctly, it will be True.
5.Convert BGR image into Gray Image
6.cv2.CascadeClassifier.detectMultiScale(image[, scaleFactor[, minNeighbors[, flags[, minSize[, maxSize]]]]])
image - input image scaleafactor - Parameter specifying how much the image size is reduced at each image scale. minNeighbors : Parameter specifying how many neighbors each candidate rectangle should have to retain it. This parameter will affect the quality of the detected faces: higher value results in less detections but with higher quality. flags : Parameter with the same meaning for an old cascade as in the function cvHaarDetectObjects. It is not used for a new cascade. minSize : Minimum possible object size. Objects smaller than that are ignored. maxSize : Maximum possible object size. Objects larger than that are ignored. If faces are found, it returns the positions of detected faces as Rect(x,y,w,h).
7.cv2.rectangle(image, start_point, end_point, color, thickness)
8.Program run until key Q is pressed
9.Destroy all windows
10.Release cap object.\

Code

• Intro and Loading Images: https://github.com/AasaiAlangaram/OpenCv-Tutorials/blob/master/Code/Intro%20and%20Loading%20Images.py
• Loading Video Source: https://github.com/AasaiAlangaram/OpenCv-Tutorials/blob/master/Code/Loading%20Video%20Source.py
• Saving Video File: https://github.com/AasaiAlangaram/OpenCv-Tutorials/blob/master/Code/Saving%20Video.py
• Drawing Line: https://github.com/AasaiAlangaram/OpenCv-Tutorials/blob/master/Code/Drawing%20line.py
• Image Operations: https://github.com/AasaiAlangaram/OpenCv-Tutorials/blob/master/Code/Image%20Operations.py
• Image Arithmetic and Logical Operations: https://github.com/AasaiAlangaram/OpenCv-Tutorials/blob/master/Code/Image%20Arithmetic%20and%20logical%20Operations.py
• Image Thresholding: https://github.com/AasaiAlangaram/OpenCv-Tutorials/blob/master/Code/Image%20Thresholding.py
• Thresholding: https://github.com/AasaiAlangaram/OpenCv-Tutorials/blob/master/Code/Thresholding.py
• Adaptive Thresholding: https://github.com/AasaiAlangaram/OpenCv-Tutorials/blob/master/Code/Adaptive%20Thresholding.py