Tag:opencv

  • C# call OpenCV to develop a simple version of beauty drawing tool [recommended]

    Time:2021-7-25

    preface Calling opencv in C # is actually very simple, because there are many open source libraries of OpenCV in C #. This paper mainly introduces the application in WPF projectOpenCVSharp3-AnyCPUThe open source class library handles pictures. Let’s do the preparations before development. preparation First, let’s create a WPF project. Then, search opencvsharp on nuget, […]

  • Using OpenCV to deal with the frame difference of two pictures in C + +

    Time:2021-5-11

    In this paper, we share the specific code of using OpenCV to deal with the frame difference of two pictures, for your reference, the specific content is as follows This program is two pictures do frame difference, using C + + to achieve, the different places with frame up, read the program carefully, it should […]

  • Analysis of three frame difference method based on OpenCV

    Time:2021-5-10

    Today, I’d like to talk about three frame difference method to realize moving object detection. There are many tracking methods for motion detection picture frame. You can do it by yourself, and I’ll realize it one by one later. Today, I’ll play three frame difference method for you first( The notes are very clear, and […]

  • Opencv uses the first N frames of video to get the average image

    Time:2021-5-9

    This example for you to share the opencv use of the first N frames of video average image specific code, for your reference, the specific content is as follows Write their own ha, you can use the small program to solve the average video model. //How to accumulate multiple images and average them in opencv […]

  • Average background method based on OpenCV

    Time:2021-5-8

    The basic idea of average background method is to calculate the average value and standard deviation of each pixel as its background model. The average background method uses four opencv functions: Cvacc (), cumulative image; Cvabsdiff(), which calculates the only difference of each frame in a certain period of time; Cvinrange (), the image is […]

  • Opencv frame difference method to find the image with large difference

    Time:2021-5-7

    This example for you to share the opencv frame difference method to find out the difference between the image, for your reference, the specific content is as follows #include “stdafx.h” #include <stdio.h> #include <stdlib.h> #include <iostream> #include <fstream> #include <opencv2/core/core.hpp> #include <opencv2/highgui/highgui.hpp> #include <opencv2/imgproc/imgproc.hpp> #include <opencv2/objdetect/objdetect.hpp> #include <opencv2/ml/ml.hpp> #include <string.h> #define IMAGENO 18456 using namespace […]

  • Detailed explanation of OpenCV implementation of inter frame difference method

    Time:2021-5-5

    In this paper, we share the specific method of OpenCV to realize the inter frame difference method for your reference. The specific content is as follows 1、 Basic concepts There are many kinds of vehicle detection algorithms based on Video: optical flow detection, frame difference method, background elimination method (including: histogram method, average method, single […]

  • Python to achieve opencv used by the image format and Base64 conversion

    Time:2021-5-4

    The NP image (imread image) is transcoded to Base64 format def image_to_base64(image_np): image = cv2.imencode(‘.jpg’,image_np)[1] image_code = str(base64.b64encode(image))[2:-1] return image_code Parsing Base64 encoding into opencv available pictures def base64_to_image(base64_code): #Base64 decoding img_data = base64.b64decode(base64_code) #Convert to NP array img_array = np.fromstring(img_data, np.uint8) #Convert to opencv format img = cv2.imdecode(img_array, cv2.COLOR_RGB2BGR) return img The above image […]

  • Opencv extracting image whose contour is larger than a certain threshold

    Time:2021-5-2

    In this paper, we share an example of OpenCV contour extraction is greater than a certain threshold image, for your reference, the specific content is as follows #include “stdafx.h” #include “cv.h” #include “highgui.h” #include “stdio.h” #include”core/core.hpp” #include “opencv2/highgui/highgui.hpp” #include “opencv2/core/core.hpp” #include “opencv2/imgproc/imgproc.hpp” #include <iostream> using namespace cv; using namespace std; int main(int argc, char** argv) […]

  • Implementation of OpenCV format and pil.image format conversion with Python

    Time:2021-5-2

    OpenCV to pil.image format: import cv2 from PIL import Image import numpy img = cv2.imread(“plane.jpg”) cv2.imshow(“OpenCV”,img) image = Image.fromarray(cv2.cvtColor(img,cv2.COLOR_BGR2RGB)) image.show() cv2.waitKey() Pil.image to opencv format: import cv2 from PIL import Image import numpy image = Image.open(“plane.jpg”) image.show() img = cv2.cvtColor(numpy.asarray(image),cv2.COLOR_RGB2BGR) cv2.imshow(“OpenCV”,img) cv2.waitKey() The above Python implementation of OpenCV format and PIL. Image format conversion is […]

  • Python + opencv implementation of rotating text correction

    Time:2021-5-1

    Suppose we have an image in which the text is rotated at an unknown angle. In order to correct the angle of the text, we need to complete the following steps: 1. Detect the text range in the graph 2. Calculate the angle at which the text is rotated 3. Rotate the image at a […]

  • How to install opencv in CentOS 6.5

    Time:2021-4-29

    Opencv is a cross platform computer vision library, which can be used for image processing. How to install centos6.5? Let’s take the installation of OpenCV version 2.3.1 as an example to give you a detailed introduction. 1: Install dependency package Depending on the package, you can use Yum to install. You need the following packages: […]