Opencv object detection and crop

1. How do I crop a detected face in OpenCV Python?
2. How do I crop an image in OpenCV?
3. Is OpenCV good for object detection?

How do I crop a detected face in OpenCV Python?

We will use haarcascade_frontalface_alt. xml for human face detection in the image. The detected face coordinates are in (x,y,w,h). To crop and save the detected face we save the image[y:y+h, x:x+w].

How do I crop an image in OpenCV?

There is no specific function for cropping using OpenCV, NumPy array slicing is what does the job. Every image that is read in, gets stored in a 2D array (for each color channel). Simply specify the height and width (in pixels) of the area to be cropped. And it's done!

Is OpenCV good for object detection?

OpenCV is the huge open-source library for computer vision, machine learning, and image processing and now it plays a major role in real-time operation which is very important in today's systems. By using it, one can process images and videos to identify objects, faces, or even the handwriting of a human.