opencv python tutorial

FOURCC is a four-byte code used to determine the encoding format of the video.A list of available encodings can be found from fourcc.org.#-*-coding:utf-8-*-ImportNumPy as NPImportCv2cap=Cv2. Videocapture (0) FourCC= Cv2. VIDEOWRITER_FOURCC (*'XVID') out= Cv2. Videowriter ('Test.avi', FourCC, 20.0, (640, 480)) whilecap.isopened (): RET, Frame=Cap.read ()ifRET = =True:frame=Cv2.flip (frame, 0) Out.write (frame) cv2.imshow ('Frame', frame)ifCv2.waitkey (1) 0xff = = Ord ('Q'): Break

To capture a video, you first create a Videocapture object.The parameter can be the index number of the device, or a video file.#-*-coding:utf-8-*-ImportNumPy as NPImportCv2cap=Cv2. Videocapture (0) whileTrue:ret, Frame=Cap.read () Gray=Cv2.cvtcolor (frame, cv2. Color_bgr2gray) Cv2.imshow ('Frame', Gray)ifCv2.waitkey (1) 0xff = = Ord ('Q'): Breakcap.release () cv2.destroyallwindows ( )Cap.read () returns a Boolean value. If the frame reads correctly, it is ture. Finally, you can check t

The rectangular border (bounding Rectangle) is said to wrap the found shape with a minimum rectangle. There is also a rectangle with a rotation, the area will be smaller, the effect seeOn the CodeFirst introduce the next Cv2.boundingrect (IMG) functionThis function is very simple, IMG is a binary graph, that is, its parameters;Returns four values, respectively, x,y,w,h;X, y is the coordinates of the top left of the matrix, W,h is the width and height of the matrixThen usecv2.rectangle(img, (x,y)

A python generates a sequence of random strings + writes to the picture　　 fromPILImportImage,imagedraw,imagefontImportNumPy as NPImportRandomImportstringImportCv2#Generate random string forIinchRange (1,10000): Strnum= Random.randint (2,10) Ran_str="". Join (Random.sample (string.ascii_letters +string.digits, Strnum)) Font= Imagefont.truetype ('D:\MULTIMEDIA\ROSEWOODSTD-REGULAR.OTF', 60# OTF and TTF are all available. Image= Image.new ("RGB", (300, 20

standard Library, as well as binary forms of various platforms, can be obtained from the official Python website: https://www.python.org/free of charge, and you are free to spread these things.The site also contains suggestions from many people about the modules, programs, and tools that face Python 3, as well as a variety of additional documentation. The Python

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Image changes do not change the shape of the image. Image transformation is divided into three types: horizontal mirror, vertical mirror, diagonal image to set the size of the image is MXN, then the horizontal mirror can be by the formula I = IJ = n-j + 1 vertical mirror can be the formula I = m-i + 1J = J Diagonal Mirror can be by the formula I = m-i + 1J = n-j + 1 It is worth noting that the coordinates in OPENCV start from [0,0], so +1 of the formu

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