opencv3.1

问题 I'm programming a Java application that detects simple geometric shapes. The following Python code is used as a reference: How to detect simple geometric shapes using OpenCV This is some of the code [Python]: contours,h = cv2.findContours(thresholdedImage,1,2) for cnt in contours: approx = cv2.approxPolyDP(cnt,0.01*cv2.arcLength(cnt,True),True) print len(approx) if len(approx)==5: print "pentagon" cv2.drawContours(img,[cnt],0,255,-1) elif len(approx)==3: print "triangle" cv2.drawContours(img,

问题 I've downloaded opencv 3.1 and I want to start a project in Visual Studio 2015. I don't know how to link this library to my project. Also I want to know if I can continue with this opencv cause it just have a x64 and my project doesn't target on 64bits systems. 回答1: Download opencv 3.1 for windows Extract to folder like c:/opencv Set environment variables by setx -m . This depends on your path. Type this into command line started by cmd. setx -m OPENCV_DIR C:\opencv\build\x64\vc14 In the path

问题 I've downloaded opencv 3.1 and I want to start a project in Visual Studio 2015. I don't know how to link this library to my project. Also I want to know if I can continue with this opencv cause it just have a x64 and my project doesn't target on 64bits systems. 回答1: Download opencv 3.1 for windows Extract to folder like c:/opencv Set environment variables by setx -m . This depends on your path. Type this into command line started by cmd. setx -m OPENCV_DIR C:\opencv\build\x64\vc14 In the path

问题 I've downloaded opencv 3.1 and I want to start a project in Visual Studio 2015. I don't know how to link this library to my project. Also I want to know if I can continue with this opencv cause it just have a x64 and my project doesn't target on 64bits systems. 回答1: Download opencv 3.1 for windows Extract to folder like c:/opencv Set environment variables by setx -m . This depends on your path. Type this into command line started by cmd. setx -m OPENCV_DIR C:\opencv\build\x64\vc14 In the path

问题 I am working with OpenCV 3.1 and with Python. My problem comes when I try to deskew (fix the tilt of) an image with text. I am using cv2.warpPerspective to make it possible, but the image loses a lot of quality. You can see here the original part of the image: and then, here, the "rotated" image: it is like smoothed . I was using morphological transformation like: kernel = np.ones((2, 2), np.uint8) blur_image = cv2.erode(tresh, kernel, iterations=1) and white_mask2 = cv2.morphologyEx(white

问题 I am trying to detect red color from the video that's being taken from my webcam. The following code example given below is taken from OpenCV Documentation. The code is given below: import cv2 import numpy as np cap = cv2.VideoCapture(0) while(1): # Take each frame _, frame = cap.read() # Convert BGR to HSV hsv = cv2.cvtColor(frame, cv2.COLOR_BGR2HSV) # define range of blue color in HSV lower_blue = np.array([110,50,50]) upper_blue = np.array([130,255,255]) # Threshold the HSV image to get

问题 I am trying to dump keypoints of cars with SIFT or SURF and match these keypoints to a video in order to detect cars. Keypoints are more convenient to use instead of Haar Cascades because I would have to use a lot of images for example 5000 to train, which will take a lot of computation process. Keypoints from SURF or SIFT are scale invariant which will be almost the same in every car. The code for dumping keypoints into a txt file is: import cv2 import numpy as np import os import cPickle

问题 there are a lot of questions asked regarding opencv + H.264 but none of them gave detailed explanation. i am using openh264(openh264-1.4.0-win32msvc.dll) along with opencv 3.1(custom build with cmake having ffmpeg enabled) in visual studio, i wanted to save video coming from webcam in mp4 format with H.264 compression VideoWriter write = VideoWriter("D:/movie.mp4", CV_FOURCC('H', '2', '6', '4'), 10.0, cv::Size(192, 144), true); before using openh264, in console window i was seeing an warning

问题 I installed opencv3.1.0 with opencv_contrib correctly installed but I am getting the error no module 'DescriptorExtractor_create()' and everything is fine. Suggestions??? :) 回答1: In OpenCV 3.x, SIFT and SURF have been removed because they are patented algorithms and as such are not installed by default. However they are available in the 'opencv_contrib' package which is not installed by default with the normal OpenCV installation. You need to install them manually. Consider this for details

问题 I have being trying to install OpenCV on Ubuntu 16.04 unsing several tutorials and i always end up with an error. This is the last one i've got following this tutorial: https://github.com/BVLC/caffe/wiki/Ubuntu-16.04-or-15.10-OpenCV-3.1-Installation-Guide What can i do? [ 48%] Linking CXX executable ../../bin/opencv_test_viz //usr/lib/x86_64-linux-gnu/libvtkIOImage-6.2.so.6.2: undefined reference to `TIFFReadDirectory@LIBTIFF_4.0' //usr/lib/x86_64-linux-gnu/libvtkIOImage-6.2.so.6.2: undefined