- Mastering OpenCV 4 with Python
- Alberto Fernández Villán
- 272字
- 2021-07-02 12:07:13
Image-processing steps
Image processing includes the following three steps:
- Get the image to work with. This process usually involves some functions so that you can read the image from different sources (camera, video stream, disk, online resources).
- Process the image by applying image-processing techniques to achieve the required functionality (for example, detecting a cat in an image).
- Show the result of the processing step (for example, drawing a bounding box in the image and then saving it to disk).
Furthermore, step two can be broken down into three processing levels:
- Low-level process
- Mid-level process
- High-level process
The low-level process usually takes an image as the input and then outputs another image. Example procedures that can be applied in this step include the following:
- Noise removal
- Image sharpening
- Illumination normalization
- Perspective correction
In connection with the face-detection example, the output image can be an illumination normalization image to deal with changes caused by sun reflections.
The mid-level process takes the preprocessed image to output some kind of representation of the image. Consider this as a collection of numbers (for example, a vector containing 100 numbers), which summarizes the main information of the image to be used for further processing. In connection with the face-detection example, the output could be a rectangle defined by a point (x,y), the width and the height containing the detected face.
The high-level process takes this vector of numbers (usually called attributes) and outputs the final result. For example, the input could be the detected face and the output could be the following:
- Face recognition
- Emotion recognition
- Drowsiness and distraction detection
- Remote heart rate measurement from the face
- Implementing VMware Horizon 7(Second Edition)
- Vue 3移動Web開發(fā)與性能調優(yōu)實戰(zhàn)
- 案例式C語言程序設計
- Python爬蟲開發(fā):從入門到實戰(zhàn)(微課版)
- JavaScript+jQuery開發(fā)實戰(zhàn)
- Java加密與解密的藝術(第2版)
- C/C++常用算法手冊(第3版)
- Drupal 8 Module Development
- Visual Basic程序設計
- Java語言程序設計教程
- Python Interviews
- SQL Server 入門很輕松(微課超值版)
- MyBatis 3源碼深度解析
- Go語言入門經典
- 計算機常用算法與程序設計教程(第2版)