程永强

OpenCV 3 Getting Started with Videos - OpenCV 播放视频 - 捕获视频 - 保存视频Learn to play videos, capture videos from Camera and write it as a video.OpenCV documentation index - OpenCV 文档索引https://www.docs.opencv.org/master (4.x)https://www.docs.opencv.org/master

OpenCV - highgui (High-level GUI)OpenCV documentation index - OpenCV 文档索引https://www.docs.opencv.org/master (4.x)https://www.docs.opencv.org/master/3.4 (3.4.x)https://www.docs.opencv.org/3.4/2.4 (2.4.x)https://www.docs.opencv.org/2.4/Welcome to Op

OpenCV 3 Getting Started with Images - OpenCV 读取图像 - 显示图像 - 保存图像Learn to load an image, display it, and save it back.OpenCV documentation index - OpenCV 文档索引https://www.docs.opencv.org/master (4.x)https://www.docs.opencv.org/master/3.4 (3.4.x)https:

OpenCV 3 drawing rectangle - 绘制 rectangleOpenCV documentation index - OpenCV 文档索引https://www.docs.opencv.org/master (4.x)https://www.docs.opencv.org/master/3.4 (3.4.x)https://www.docs.opencv.org/3.4/2.4 (2.4.x)https://www.docs.opencv.org/2.4/1. 3.

OpenCV - C++ - cv::circlehttps://docs.opencv.org/4.2.0/d6/d6e/group__imgproc__draw.html1. cv::circleC++void cv::circle (InputOutputArray img, Point center, int radius, const Scalar &color, int thickness=1, int lineType=LINE_8, int shift=0)Pythoni

OpenCV - C++ - cv::Mat image_height = image.rows - image_weight = image.cols1. image_height = image.rows - image_weight = image.cols//============================================================================// Name : cv::rectangle// Author

Load, Modify, and Save an Image - 加载、修改和保存图像OpenCV 4.2.0 - Moduleshttps://docs.opencv.org/4.2.0/index.htmlOpenCV 4.2.0 - Tutorialshttps://docs.opencv.org/4.2.0/d9/df8/tutorial_root.html0. Load, Modify, and Save an Imagehttps://docs.opencv.org/4.2.0/d

OpenCV - C++ - region of interest (ROI)In this tutorial, we will learn how to select a bounding box or a rectangular region of interest (ROI) in an image in OpenCV.在本教程中，我们将学习如何在 OpenCV 中选择图像中的矩形感兴趣区域 (ROI)。Let’s start with a sample code. It allows you

OpenCV Python - Get Image Shape/Dimensionshttps://www.tutorialkart.com/opencv/python/opencv-python-get-image-size/In Image Processing applications, it is often necessary to know the size of an image that is loaded or transformed through various stages. I

OpenCV - C++ - cv::resize1. cv::resizeC++void cv::resize (InputArray src, OutputArray dst, Size dsize, double fx = 0, double fy = 0, int interpolation = INTER_LINEAR)Pythondst = cv.resize(src, dsize[, dst[, fx[, fy[, interpolation]]]])#i

OPENCV_GENERATE_PKGCONFIG - pkg-config --modversion opencv41. opencv/CMakeLists.txthttps://github.com/opencv/opencvhttps://github.com/opencv/opencv/blob/master/CMakeLists.txtOpenCV 4 配置默认不产生 opencv4.pc。OCV_OPTION(OPENCV_GENERATE_PKGCONFIG "Generate .

OpenCV 连续图片序列跳帧 - 添加屏蔽区域 (mask)1. image_frameskip_filter_720p_mask.py#!/usr/bin/env python3# -*- coding: utf-8 -*-# Yongqiang Chengfrom __future__ import absolute_importfrom __future__ import divisionfrom __future__ import print_functionimport os

OpenCV 3 resizeOpenCV documentation index - OpenCV 文档索引https://www.docs.opencv.org/master (4.x)https://www.docs.opencv.org/master/3.4 (3.4.x)https://www.docs.opencv.org/3.4/2.4 (2.4.x)https://www.docs.opencv.org/2.4/1. 3.4 (3.4.x) -> Modules -&

OpenCV - C++ - cv::Pointhttps://docs.opencv.org/4.2.0/dc/d84/group__core__basic.htmltypedef Point2i cv::PointTemplate class for 2D points specified by its coordinates x and y.由其坐标 x 和 y 指定的 2D 点的模板类。An instance of the class is interchangeable with C s

OpenCV 4.2.0 环境下 AlexeyAB/darknet 编译和链接https://github.com/AlexeyAB/darknethttps://docs.opencv.org/4.2.0/index.html1. pjreddie/darknet - Makefile - OpenCV 2.x / 3.xGPU=1CUDNN=1CUDNN_HALF=0OPENCV=1AVX=0OPENMP=0LIBSO=0ZED_CAMERA=0# set GPU=1 and

OpenCV 3 drawContours()OpenCV documentation index - OpenCV 文档索引https://www.docs.opencv.org/master (4.x)https://www.docs.opencv.org/master/3.4 (3.4.x)https://www.docs.opencv.org/3.4/2.4 (2.4.x)https://www.docs.opencv.org/2.4/Welcome to OpenCV-Pytho

ubuntu 16.04 desktop + server LTS - OpenCV 安装 C API (C 语言接口)The first step that we should do, is make an update of our repositories, so go and open the terminal and execute the follow commands.sudo apt-get updatesudo apt-get upgrade# (OpenCV 2.4)sudo a

OpenCV - C++ - cv::linehttps://docs.opencv.org/4.2.0/d6/d6e/group__imgproc__draw.html1. cv::lineC++void cv::line(InputOutputArray img, Point pt1, Point pt2, const Scalar &color, int thickness=1, int lineType=LINE_8, int shift=0)Pythonimg = cv.lin

OpenCV 3 drawing polygons and polylines - 绘制 polygons and polylinesOpenCV documentation index - OpenCV 文档索引https://www.docs.opencv.org/master (4.x)https://www.docs.opencv.org/master/3.4 (3.4.x)https://www.docs.opencv.org/3.4/2.4 (2.4.x)https://www.

图片序列转换为 .jpg 格式 - rename - resize1. nonjpg_to_jpg.py#!/usr/bin/env python3# -*- coding: utf-8 -*-# Yongqiang Chengfrom __future__ import absolute_importfrom __future__ import divisionfrom __future__ import print_functionimport osimport sysimpo

OpenCV 3 image shape - size - dtypeOpenCV documentation index - OpenCV 文档索引https://www.docs.opencv.org/master (4.x)https://www.docs.opencv.org/master/3.4 (3.4.x)https://www.docs.opencv.org/3.4/2.4 (2.4.x)https://www.docs.opencv.org/2.4/1. 3.4 (3.4

Ubuntu 16.04 通过源代码 (Source Code) 安装的 OpenCV 4You can install OpenCV from the Ubuntu repository or from the official site.1. Install OpenCV 2 / 3 from the Ubuntu repositoryYou can install OpenCV 2 / 3 from the Ubuntu repository: sudo apt-get install libo

Install OpenCV from the Ubuntu or Debian repositoryhttp://milq.github.io/install-opencv-ubuntu-debian/Install OpenCV on Ubuntu or Debian is a bit long but very easy. You can install OpenCV from the Ubuntu or Debian repository or from the official site.

OpenCV 4.2.0 - IntroductionOpenCV 4.2.0 - Moduleshttps://docs.opencv.org/4.2.0/OpenCV 4.2.0 - Introductionhttps://docs.opencv.org/4.2.0/d1/dfb/intro.htmlOpenCV (Open Source Computer Vision Library: http://opencv.org) is an open-source BSD-licensed lib

Mouse as a Paint-Brush - 鼠标作为画笔OpenCV documentation index - OpenCV 文档索引https://www.docs.opencv.org/master (4.x)https://www.docs.opencv.org/master/3.4 (3.4.x)https://www.docs.opencv.org/3.4/2.4 (2.4.x)https://www.docs.opencv.org/2.4/1. Mouse as a P

Load and Display an Image - 加载并显示图像OpenCV 4.2.0 - Moduleshttps://docs.opencv.org/4.2.0/index.htmlOpenCV 4.2.0 - Tutorialshttps://docs.opencv.org/4.2.0/d9/df8/tutorial_root.html0. Load and Display an Imagehttps://docs.opencv.org/4.2.0/db/deb/tutorial_

OpenCV - C++ - cv::Scalarhttps://docs.opencv.org/4.2.0/dc/d84/group__core__basic.htmltypedef Scalar_<double> cv::ScalarTemplate class for a 4-element vector derived from Vec.源自 Vec 的 4 元素向量的模板类。Being derived from Vec<_Tp, 4>, Scalar_ and S

Ubuntu 16.04 LTS OpenCV C / C++ and Python interface (接口)1. Install OpenCV from the Ubuntu Repository (apt) - Python 调用接口Python3sudo apt updatesudo apt install python3-opencvPython2sudo apt updatesudo apt install python-opencvOpenCV versionpytho

OpenCV 3 boxPoints() OpenCV documentation index - OpenCV 文档索引https://www.docs.opencv.org/master (4.x)https://www.docs.opencv.org/master/3.4 (3.4.x)https://www.docs.opencv.org/3.4/2.4 (2.4.x)https://www.docs.opencv.org/2.4/1. 3.4 (3.4.x) -> Modu

OpenCV documentation index - OpenCV 文档索引https://www.docs.opencv.org/master (4.x)3.4 (3.4.x)2.4 (2.4.x)Doxygen is the de facto standard tool for generating documentation from annotated C++ sources, but it also supports other popular programming la

连续图片序列跳帧 - 截取图像块 - 添加屏蔽区域 (mask)1. dewarp_image_frameskip_filter_roi_720p_mask.py#!/usr/bin/env python3# -*- coding: utf-8 -*-# Yongqiang Chengfrom __future__ import absolute_importfrom __future__ import divisionfrom __future__ import print_functio

OpenCV - C++ - cv::rectanglehttps://docs.opencv.org/4.2.0/d6/d6e/group__imgproc__draw.html1. cv::rectangleC++void cv::rectangle (InputOutputArray img, Point pt1, Point pt2, const Scalar &color, int thickness=1, int lineType=LINE_8, int shift=0)voi

OpenCV 3 drawing text string - 绘制文本字符串OpenCV documentation index - OpenCV 文档索引https://www.docs.opencv.org/master (4.x)https://www.docs.opencv.org/master/3.4 (3.4.x)https://www.docs.opencv.org/3.4/2.4 (2.4.x)https://www.docs.opencv.org/2.4/1. 3.4 (

sudo pip2 install -i https://pypi.douban.com/simple opencv-python==3.4.1.151. sudo apt remove python-opencv -ystrong@foreverstrong:~/tensorflow_work/R2CNN_Faster-RCNN_Tensorflow/tools$ sudo apt remove python-opencv[sudo] password for strong: Reading pa

OpenCV 3 drawing arrow - 绘制箭头OpenCV documentation index - OpenCV 文档索引https://www.docs.opencv.org/master (4.x)https://www.docs.opencv.org/master/3.4 (3.4.x)https://www.docs.opencv.org/3.4/2.4 (2.4.x)https://www.docs.opencv.org/2.4/1. 3.4 (3.4.x) -&

OpenCV - C++ - cv::setWindowPropertyHigh-level GUI#include <opencv2/highgui.hpp>1. setWindowProperty()void cv::setWindowProperty(const String &winname, int prop_id, double prop_value) - C++None = cv.setWindowProperty(winname, prop_id, prop_

OpenCV 3 Flags for video I/OOpenCV documentation index - OpenCV 文档索引https://www.docs.opencv.org/master (4.x)https://www.docs.opencv.org/master/3.4 (3.4.x)https://www.docs.opencv.org/3.4/2.4 (2.4.x)https://www.docs.opencv.org/2.4/1. 3.4 (3.4.x) -&g

OpenCV 3 fontFace - Font type - 字体类型衬线体 (serif) 和无衬线体 (sans-serif)衬线字体是在字的笔画开始、结束的地方有额外的装饰，而且笔画的粗细会有所不同。无衬线体是无衬线字体，没有这些额外的装饰，而且笔画的粗细差不多。serif [ˈserɪf]：n. 衬线sans serif [,sæn 'serif]：无衬线字体，灯芯体CV_...

OpenCV 视频解析为连续图片序列 - 添加屏蔽区域 (mask)1. video_to_image_converter_for_linux_cv3_720p_mask.py#!/usr/bin/env python3# -*- coding: utf-8 -*-# ============================================================================================# Name : video_t

Eclipse IDE for C/C++ Developers - OpenCV 4.2.0 配置OpenCV 4.2.0 - Moduleshttps://docs.opencv.org/4.2.0/index.htmlOpenCV 4.2.0 - Tutorialshttps://docs.opencv.org/4.2.0/d9/df8/tutorial_root.html0. Using OpenCV with Eclipse (plugin CDT)OpenCV modules -&.