Programmer Think

1, Introduction 1 subject background This topic is a population statistics system based on matlab. In recent years, many industries have great demand for people flow information, such as bus stops, subway stations, shopping malls, entrances and exits, etc. Through the population statistics system, the flow of people in various places can be co ...

In slam, optical flow tracking judges the dynamics of an object in the image, which mainly includes three functions: 1. goodFeaturesToTrack function Function: extract corners at pixel level in the input image, and support harris corners and Shi Tomasi corners. Function prototype: void goodFeaturesToTrack( InputArray image, OutputArray corne ...

1, Introduction In 1974, the French engineer J.Morlet first proposed the concept of wavelet transform. In 1986, the famous mathematician Y.Meyer accidentally constructed a real wavelet base and established the multi-scale analysis of constructing wavelet base in cooperation with S.Mallat. Wavelet analysis began to flourish. Wavelet analysis ha ...

1, Introduction 1 Overview BP (Back Propagation) neural network was proposed by the scientific research group headed by Rumelhart and McCelland in 1986. See their paper learning representations by Back Propagation errors published in Nature. BP neural network is a multilayer feedforward network trained by error back propagation algorithm. It ...

1, Introduction 1 grayscale The process of converting color image into gray image is called image graying. The pixel value in the color image is determined by the three RGB components, and each component has 0-255 (256) choices. In this way, the pixel value of a pixel can have 16 million possibilities (256256256), while the pixel value of the ...

1. Basic Theory When processing feature descriptors suitable for multiple images, there are two main feature detection methods, one is angle-based detection, the other is to process all areas in the image. Here we will focus on angle-based detection. In 1988, Harris and Stephens presented an angle detection algorithm, HS Angle Detector. See p ...

Basic principle: logical XOR operation Python is a programming language without much introduction; OpenCV is a cross platform computer vision and machine learning (partially open source) software library based on BSD license. At present, it has supported many languages, such as C, C + +, python, Java and MATLAB. Here, choose one of the langua ...

1, Case description Three classic images (lena, pepper and barbara) are added with Gaussian noise, multiplicative noise and salt and pepper noise respectively. Gaussian white noise: the mean value is 0 and the variance is 0.05. Salt and pepper noise: noise density 0.10. Multiplicative noise: here is the noise with uniformly distributed mean va ...

1, Introduction 1 past and present life of Haar classifier Face detection belongs to the category of computer vision. In the early stage, people's main research direction was face recognition, that is, to recognize the identity of people according to the face. Later, the demand for face detection in complex background is increasing, and face ...

OpenCV learning notes (3)_ Examples of gray threshold filtering and connected domain analysis in OpenCV 1. Example source Today's example comes from Halcon's example program: threshold.hdev read_image (Audi2, 'audi2') fill_interlace (Audi2, ImageFilled, 'odd') threshold (ImageFilled, Region, 0, 90) connection (Region, ConnectedRegions) ...