I successfully implemented the OpenCV square-detection example in my test application, but now need to filter the output, because it’s quite messy – or is my code wrong? I’m interested in the four corner points of the paper for skew reduction (like that) and further processing … Input & Output: Original image: click Code: double angle( … Read more
I’m trying to run this program import cv2 import time cv.NamedWindow(“camera”, 1) capture = cv.CaptureFromCAM(0) while True: img = cv.QueryFrame(capture) cv.ShowImage(“camera”, img) if cv.WaitKey(10) == 27: break cv.DestroyAllWindows() But I’m having a problem with numpy, I’m using pyschopy along with opencv. The problem I keep getting is this error report: RuntimeError: module compiled against API … Read more
I want to use OpenCV2.0 and Python2.6 to show resized images. I used and adopted this example but unfortunately, this code is for OpenCV2.1 and does not seem to be working on 2.0. Here my code: import os, glob import cv ulpath = “exampleshq/” for infile in glob.glob( os.path.join(ulpath, “*.jpg”) ): im = cv.LoadImage(infile) thumbnail … Read more
I was doing a fun project: Solving a Sudoku from an input image using OpenCV (as in Google goggles etc). And I have completed the task, but at the end I found a little problem for which I came here. I did the programming using Python API of OpenCV 2.3.1. Below is what I did … Read more
So I’ve followed this tutorial but it doesn’t seem to do anything. Simply nothing. It waits a few seconds and closes the program. What is wrong with this code? import cv2 vidcap = cv2.VideoCapture(‘Compton.mp4’) success,image = vidcap.read() count = 0 success = True while success: success,image = vidcap.read() cv2.imwrite(“frame%d.jpg” % count, image) # save frame … Read more
I need a simple and fast way to compare two images for similarity. I.e. I want to get a high value if they contain exactly the same thing but may have some slightly different background and may be moved / resized by a few pixel. (More concrete, if that matters: The one picture is an … Read more
Closed. This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed last year. Improve this question I was wondering if there is a way to determine if an image is blurry or … Read more
I’m trying to install OpenCV for Python through Anaconda, but I can’t seem to figure this out. I tried conda install opencv conda install cv2 I also tried searching conda search cv No cigar. I ran across this which lists opencv as an included package: http://docs.continuum.io/anaconda/pkgs.html After running conda info I noticed my version is … Read more
How can I crop images, like I’ve done before in PIL, using OpenCV. Working example on PIL im = Image.open(‘0.png’).convert(‘L’) im = im.crop((1, 1, 98, 33)) im.save(‘_0.png’) But how I can do it on OpenCV? This is what I tried: im = cv.imread(‘0.png’, cv.CV_LOAD_IMAGE_GRAYSCALE) (thresh, im_bw) = cv.threshold(im, 128, 255, cv.THRESH_OTSU) im = cv.getRectSubPix(im_bw, (98, … Read more
I have installed OpenCV on the Occidentalis operating system (a variant of Raspbian) on a Raspberry Pi, using jayrambhia’s script found here. It installed version 2.4.5. When I try import cv2 in a Python program, I get the following message: pi@raspberrypi~$ python cam.py Traceback (most recent call last) File “cam.py”, line 1, in <module> import … Read more
