Programmer Think

1. Introduction Principle of Wavelet Transform Wavelet transform is a time-scale (time-frequency) analysis method for signals. It is a time-frequency localization analysis method where the window size is fixed and the shape can be changed, and the time window and frequency window can be changed. It is characterized by multi-resolution analysis ...

Original link: http://www.juzicode.com/opencv-python-matchtemplate Return to opencv Python tutorial Template matching can find the feature image in the source image. The feature image is generally a rectangular image. In the previous article, orange fungus also introduced some methods about "matching" function, such as morphological ...

1, Introduction 1 threshold The simplest way to block an image is to set a threshold to binarize the image. How should we choose this threshold For the image with obvious boundary in the histogram of the image, we can easily find this threshold, but if the boundary of the histogram of the image is not obvious, it will become very difficult to ...

Introduction of template matching algorithm 1 Overview Pattern recognition is to study the automatic processing and interpretation of patterns by solving mathematical models through computers. Among the various methods of pattern recognition, template matching is the easiest one, and its mathematical model is easy to establish. Digital image p ...

1, Introduction The detection of pavement cracks is an important part of expressway pavement disease maintenance and management. In recent years, pavement crack automatic detection technology has been widely used. Due to the complexity of pavement crack image, the detection algorithm directly affects the accuracy of detection results. Therefor ...

1, Introduction Mean filtering refers to the pixel value of any point, which is the surroundingThe average of the pixel values. For example, in the following figure, the pixel value of a red dot is the sum of the pixel values of the surrounding blue background area divided by 25, 25 = 55 is the size of the blue area. The detailed calcul ...

1, Introduction to morphology 1 Overview 1.1 basic idea The corresponding shape in the image is measured and extracted by the structural elements with a certain shape, so as to achieve the purpose of image analysis and recognition 1.2 basic operation Expansion, corrosion, opening and closing operation 1.3 fundamentals of Mathematics set theo ...

1, Picture conversion (1) Original drawing 1. Original sky jpeg(2240*1080) 2. Original drawing information (2) Convert to bitmap 1. Use Photoshop and the drawing tool provided by the computer or IrfanView to change the color format and bit depth of the picture, and convert the original picture into the following pictures, including 32- ...

1, Bitmap principle 1. Introduction to bitmap The computer can display images in bitmap and vector format. 1.1 bitmap Image is also called dot matrix or raster. It uses small dots called pixels to describe the image. A computer screen is actually a grid containing a large number of pixels. When we enlarge the bitmap, each pixel looks like ...

Data cleaning Images made by yourself are prone to bad data (such as grayscale images, for example, CV2 can't read data, and there is no shape). The following code is directly: import os import tensorflow as tf from PIL import Image import matplotlib.pyplot as plt import numpy as np import cv2 import shutil from PIL import ImageFile Imag ...