Digital Image Processing--Image Filtering

Digital Image Processing – Image Filtering 1 main content A. Select the experimental image for the experiment, complete image reading and display, and add noise to the image; B. Write the filter functions of three image filters; Among them, the general specific implementation steps of mean filtering are: 1. Select a (2n+l) x (2n+l) wind ...

Posted by jd57 on Tue, 29 Nov 2022 05:01:34 +0300

python --opencv image processing Canny operator edge detection (Roberts operator, Prewitt operator, Sobel operator, Laplacian operator, Scharr operator, LOG operator)

edge detection Edge detection is a common method of image segmentation based on gray level mutation. Its essence is to extract the features of discontinuous parts in the image. At present, the common edge detection operators include difference operator, Roberts operator, Sobel operator, Prewitt operator, Log operator and Canny operator. Amon ...

Posted by robot_nader on Wed, 24 Aug 2022 04:20:26 +0300

[pangolin] [pangolin practice] [pangolin learning and use records]

0 Preface (1) operation instructions of pangolin 1.1 instructions for cmakelists.txt find_package(Pangolin REQUIRED) include_directories(${Pangolin_INCLUDE_DIRS}) add_executable(xxx src/xxx.cpp) target_link_libraries(xxx ${Pangolin_LIBRARIES}) 1.2 use of header files #include <pangolin/pangolin.h> 1.3 use of code 1.3.1 simpl ...

Posted by herbally on Thu, 18 Aug 2022 16:59:37 +0300

Automatic recognition of nucleic acid detection time by software using OpenCV

Question introduction In the program engineering training course, a problem occurred: Mobile phone screenshot nucleic acid detection report, using OpenCV software to automatically identify whether the time for nucleic acid detection is within 72 hours. I. Preparations Software needed to accomplish this task: - Python3.x - OpenCV-Py ...

Posted by fitzromeo on Sat, 02 Jul 2022 22:04:45 +0300

Opencv c + + (image processing)

catalogue 1, Image reading and display 2, Image preprocessing Principle and algorithm of Gaussian blur Canny edge detection 3, Image clipping 4, Draw shapes and add text 5, Perspective transformation 6, Color detection 7, Shape detection and contour detection 8, Face recognition 1, Image reading and display #include<opencv2/imgc ...

Posted by iloveyou on Wed, 25 May 2022 00:49:28 +0300

Python opencv image processing foundation summary line detection circle detection contour discovery

I still have the possibility of change At the thought of this My heart surged 1, Line detection The premise of using Hough line transform for line detection is that the edge detection has been completed # Standard Hough line transformation cv2.HoughLines(image, rho, theta, threshold, lines=None, srn=None, stn=None, min_theta=None, max_theta= ...

Posted by truCido on Thu, 19 May 2022 11:01:44 +0300

Introduction to OpenCV -- image smoothing technology

About image sampling There are many ways to obtain digital images. Usually, image sampling can be used to digitize continuous images. The collection relationship between sampling points is the grid, and the infinitesimal sampling points between grids correspond to the pixels in the image. Sampling on image transformation is the process of cha ...

Posted by rimelta on Fri, 13 May 2022 03:46:16 +0300

OpenCV uses forEach for parallel pixel access

Parallel pixel access using forEach in OpenCV In this tutorial, we will compare the performance of the forEach method of the Mat class and other ways to access and convert pixel values in OpenCV. We will show how to use the foreat method much more efficiently than the foreat method. There are hidden gemstones in OpenCV, which are sometimes not ...

Posted by gnize on Wed, 11 May 2022 15:12:08 +0300

Face recognition study notes based on OPENCV

Two weeks ago, I received the teacher's request to participate in the pattern recognition competition. The content is probably to detect the faces that appear in the video, and then count the number. After seeing it at first, I had no clue. After all, this is the first time I have come into contact with machine vision. I have no direction. Late ...

Posted by cookiemonster4470 on Mon, 09 May 2022 18:31:34 +0300

python OpenCV drawing function

OpenCV can be used to draw different collection graphics, including lines, rectangles, circles, ellipses, polygons and adding text to images. The drawing functions used include CV2 line(),cv2.circle(),cv2.rectangle() ,cv2.putText() and so on. These drawing functions need to set parameters, such as: • img: the image you want to draw. & ...

Posted by drizzle on Mon, 09 May 2022 12:39:28 +0300