opencv python tutorial

[Opencv + python in ubuntu] install opencv in ubuntu This article will introduce how to install opencv 2.4.10 in ubuntu 14.04. I know that it is not easy to get started. It is better to teach people to fish than to teach them to fish. I hope I can help some friends. Prepare a stable system, select a source with good co

First of all, thank De Lihui Teacher Translation finishing of the "Opencv-python Chinese course", this document is really good, for OpenCV beginners, help is very large, can let beginners quick start. Recommend two OPENCV learning sites: (1) http://docs.opencv.org/2.4/index.html This site can query the use of

face and eye detector.First we need to load the required XML classifier. The input image or video is then loaded in grayscale format.Import NumPy as NP Import = Cv2. Cascadeclassifier ('haarcascade_frontalface_default.xml'= Cv2. Cascadeclassifier ('haarcascade_eye.xml'= cv2.imread (' Sachin.jpg'= Cv2.cvtcolor (img, Cv2. Color_bgr2gray)Now we detect the face in the image. If a face is detected, it returns the rectangle where the face is locatedRegion Rect (X,Y,W,H). Once we have this position,

\vc11\lib all the. lib files ending in D, as follows:opencv_calib3d249dopencv_contrib249dopencv_core249dopencv_features2d249dopencv_flann249dopencv_gpu249dopencv_highgui249dopencv_imgproc249dopencv_legacy249dopencv_ml249dopencv_nonfree249dopencv_objdetect249dopencv_ocl249dopencv_photo249dopencv_stitching249dopencv_superres249dopencv_ts249dopencv_video249dopencv_videostab249dExtension tip: How to extract the file name (without type) of all files in this directory1. Go to cmd, enter the disk where

? Imagine the derivative of a black-to-white boundary as an integer, whereas a white-to-black boundary point derivative is negative. If the depth of the original image is np.int8, all negative values will be truncated to 0, in other words, the boundary is dropped. So if you want to detect both of these boundaries, the best way is to set the output data type higher, such as CV2. Cv_16s,cv2. cv_64f and so on. Take the absolute value and then turn it back to Cv2. cv_8u. The following example shows

example, when we look for a boundary that is a straight line. Do you use all the dots in the line to represent the line? No, we just need the two ends of the line. This is CV2. Chain_approx_simple to do. It removes the redundant points on the contour, compresses the contours, and saves memory overhead. We use the rectangle in the to demonstrate this technique. Draws a blue circle on each coordinate in the contour list. The first figure shows the use of CV2. The effect of Chain_approx_none, alto

C ++ opencv code tutorial for converting a blue background photo into a white background photo, opencv codeC ++ opencv code tutorial for converting a blue background photo into a white background photo. # Include

') or Cv2.cv.FOURCC (* ' MJPG ').The following code captures the video from the camera, rotates each frame horizontally and saves it.ImportNumPy as NPImportCv2cap=Cv2. Videocapture (0)#Define The codec and create Videowriter objectFOURCC = Cv2. VIDEOWRITER_FOURCC (*'XVID') out= Cv2. Videowriter ('Output.avi', FourCC, 20.0, (640,480)) while(cap.isopened ()): RET, Frame=Cap.read ()ifret==True:frame=Cv2.flip (frame,0)#write the flipped frameOut.write (frame) cv2.imshow ('Frame', frame)ifCv2.waitke

#OpenImg. py From numpy Import * import cv2 win_name = ' mypicture ' #窗口名称 #cv2. Window_normal: The window can be resized manually Cv2.namedwindow (Win_name, Cv2. Window_normal) img = cv2.imread (' mypicture.jpg ', 1) # 0 Black-and-White Picture: 1 Color picture cv2.imshow (Win_name, img) #显示图片 Cv2.waitkey (0) cv2.destroyallwindows () #销毁创建的对象 Above for my Python code to open a picture with OpenCV

OpenCV, a cross-platform computer vision library based on BSD licensing (open source), can run on Linux, Windows, Android, and Mac OS operating systems. It is lightweight and efficient-consisting of a series of C functions and a small number of C + + classes, and provides interfaces for languages such as Python, Ruby, and Matlab, and implements many common algorithms for image processing and computer vision

This article is reproduced from OpenCV python tutorial (1, image loading, display and save) author DaetalusThis is the first OPENCV 2 computer Vision Application Programming Cookbook reading notes. The code for each chapter will be rewritten in the notes in the Python langua

Reprint: Https://mp.weixin.qq.com/s/J6eo4MRQY7jLo7P-b3nvJg Li Lin compiled from PyimagesearchAuthor Adrian rosebrockQuantum bit Report | Public number Qbitai OpenCV is a 2000 release of the open-source computer vision Library, with object recognition, image segmentation, face recognition, motion recognition and other functions, can be run on Linux, Windows, Android, Mac OS and other operating systems, with lightweight, efficient known, and provides

* cos) # atmospheric calibration parameter settings Lmini =-6.2 Lmax = 293.7 Qcal = 1 Qmax = 255 LIMIN = Lmini + (Qcal * (Lmax-Lmini)/Qmax) LI = (0.01 * ESUNI71 * cos)/(math. pi * D) Lhazel = LIMIN-LI def copy (img, new1): new1 = np. zeros (img. shape, dtype = 'uint16') new1 [:,:] = img [:,:] def computL (gain, Dn, bias): return (gain * Dn + bias) if _ name _ = '_ main _': print 'd = ', D print 'coszs =', cos print 'lhazel = ', lhazel # Calculate image reflectivity result = np. zeros (img. shap

My Raspberry Pi 2 just arrived yesterday, this guy looks very small and cute. This little guy has 4 cores 900MHZ of processor, 1G RAM. You know, Raspberry Pi 2 is much faster than most computers in my high school computer lab. Anyway, since Raspberry Pi 2 was released, I've received a lot of requests that I can write a detailed description of how to install OpenCV and Python on it. So if you want to star

This document documents the process of manually installing OPENCV 3.0 using source code under Ubuntu 14.04. The method of installing and loading OpenCV in Python is also documented.1. Install OpenCV required libraries (compilers, required libraries, optional libraries)GCC 4.4.x or laterCMake 2.6 or higherGitgtk+2.x or

Install and test OpenCV 14.04 + Python 3.0 in Ubuntu 2.7 This document describes how to manually install OpenCV 14.04 using the source code in Ubuntu 3.0. In addition, the method for installing and loading OpenCV in Python is recorded. 1. Install the library required by

OpenCV is a cross-platform computer Vision Library based on (open source) distribution that can run on Linux, Windows, and Mac OS operating systems. It is lightweight and efficient-consisting of a series of C functions and a small number of C + + classes, and provides interfaces to Python, Ruby, Matlab, and many more general-purpose algorithms for image processing and computer vision. 2. install

What is the difference between developing opencv programs using C ++ and python? Let's make a comparison! ---------- The following is a question from Liu shovel ---------- using C ++ and python to develop opencv. 1. Which one is easier to use? 2. Is there a big gap in code running efficiency? 3. Are the libraries of

Ubuntu16.04 Installing OPENCV for python/c++Online about the installation of OpenCV has a lot of information, but not a piece of information can allow me to install a successful one-time, so spent a lot to solve various accidents, I hope this can bring some people to facilitate, save time.1. Install the required libraries for the

work seems generally not how to use this (probably more expensive reason), but in general, MATLAB is also in the field of computing is very powerful.OpenCV is an open-source computer vision Library, from the beginning of the study of the image, and did not really touch it, the use of MATLAB with the image processing library, it seems that many of their functions are so spirit. But OpenCV, after all, is a professional library package, many of the func