Object detection in computer vision
Object detection is the process of finding instances of real-world objects such as faces, bicycles, and buildings in images or videos. Object detection algorithms typically use extracted features and learning algorithms to recognize instances of an object category. It is commonly used in applications such as image retrieval, security, surveillance, and advanced driver assistance systems (ADAS).
You can detect objects using a variety of models, including:
- Deep learning object detection
- Feature-based object detection
Detecting a reference object (left) in a cluttered scene (right) using feature extraction and matching. RANSAC is used to estimate the location of the object in the test image.
- Viola-Jones object detection
Face detection (left) and upper body detection (right) using the Viola-Jones Object Detector.
- SVM classification with histograms of oriented gradients (HOG) features
Human detection using pretrained SVM with HOG features.
- Image segmentation and blob analysis
Moving cars are detected using blob analysis.
Image segmented using background subtraction. The moving pixels detected from the video frame above are shown in white.
Other methods for detecting objects with computer vision include using gradient-based, derivative-based, and template matching approaches.
For more information, see MATLAB®, Computer Vision System Toolbox™, and Image Processing Toolbox™.
Examples and How To
- Face Detection with MATLAB (4:34) - Video
- Face Detection and Tracking - Example
- Detect Objects in a Cluttered Scene Using Point Feature Matching - Example
- Object Recognition Using Machine and Deep Learning - Video
- Deep Learning for Computer Vision (46:56) - Video
- Detecting Cars Using Gaussian Mixture Models - Example
- Computer Vision Made Easy (35:43) - Video
Software Reference
- Train a Cascade Object Detector - Tutorial
- Object Detection Using Faster R-CNN - Documentation
- Detect Upright People Using HOG Features - Documentation
- Feature Detection, Extraction, and Matching - Documentation
- Deep Learning for Computer Vision - Documentation
See also: Steve on Image Processing, image processing and computer vision, MATLAB and OpenCV, object recognition, face recognition, image recognition, feature extraction, stereo vision, optical flow, RANSAC, pattern recognition, object detection videos, point cloud, deep learning
