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Questions tagged [template-matching]

Template matching is the process of finding a smaller known template image in another larger image.

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OpenCV Notehead detection from note Mat/image

I am doing a project where I need to detect musical elements from stave lines, and I am in the point where I know what duration an note element has (quarter, octet, etc) and I what to detect the center of the note-head so that I can found out what…
Ambrozie Beniamin Paval
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OpenCV-Python Real-time template matching on screen (simple)

So here is the scenario: In my browser I have a small red rectangle floating around at a relatively slow speed, after a random amount of time it disappears and later reappears. I want OpenCV to search for the rectangle until it is found and then…
Disguised
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Template matching with distortions

I have a pattern/image that's printed on a piece of paper and multiple copies are stuck on the wall (ImageA) and I have a larger image (B) of the wall with all these pieces of paper. I want to find the locations of these patterns. Due to apparent…
SEU
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MatchTemplate selects the same region multiple times

My environment: I'm doing some image processing using Emgu CV (v 3.2), which is just an OpenCV C# wrapper API, in Visual Studio 2013 for Windows 10. What I'm intending to do: Given an image (of a floor plan), the user selects a region (a symbol on…
Matthew Fishman
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Stereo Image Alignment

I am wanting to automatically align stereo images for best fit. The images are taken only a few inches apart and in the same lighting conditions etc but there might be slight rotations and shifts etc. Can someone describe the best approach for this…
Andrew King
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SIFT/SURF/ORB for detection and orientation of simple pattern

My project is centered on positioning of several small objects with a stationary camera. I've drawn some crisp, simple graphical pattern images (like this), printed them out and try to detect them in the image. My straightforward method: color…
Nolemocius
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OpenCv matching template in Video [Java]

please i try to make a new application in java for matching picture and video, the matching of template in picture working fine , but when i try to do it for video i always have this error message : OpenCV Error: Assertion failed ((depth == CV_8U…
Malek Ben el ouafi
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exact position of match with OpenCV ORB matcher

I have built a simple algorithm for visual mark detection with OpenCV on Python, that uses their ORB detector as the second step. I use ORB with the BFmatcher, the code is borrowed from this project:…
Nolemocius
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How to measure rotation angle of an image compared to a known template

I've succeeded on it by using the below method, but I'm sure there must be other more time-efficient alternatives to provide exact angle of rotation instead of an approximation as the method below. I'll be pleased to hear your feedback. The…
Oscar
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matching multiple object using OpenCV

I am trying to match multiple object using only one template. But the problem is my program is matching multiple occurance for evrey object in the input image. How do i match multiple objects and evrey objects for just one time in the input image?…
Malek Ben el ouafi
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TypeError while template matching in opencv python

Part of my code is : import pyscreenshot as ImageGrab img=ImageGrab.grab() img = img.load() img = np.array(img) template = cv2.imread('s2_5.jpg',0) res = cv2.matchTemplate(img,template,cv2.TM_CCOEFF) I'm getting the following error…
user4893562
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OpenCV Template Matching error in Android

I am trying to compare two faces using matchTemplate function of opencv . I have the following code : Mat img1 = new Mat(); Utils.bitmapToMat(bmpimg1, img1); Mat img2 = new Mat(); Utils.bitmapToMat(bmpimg2, img2); Mat img = new…
Christopher Marlowe
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SURF performance parameters for template matching

I am working on SURF based template matching in MATLAB. For performance parameters often Repeatability, Precision and recall are considered. But for template which is sub-image of a big image,how to find number of correspondences in Repeatability…
Debabrata Pal
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OpenCV cv2.matchTemplate crash: Unhandled exception at 0x74B5E4E4 in python.exe: 0xC0000005

When I try to use the template matching method TM_CCOEFF of opencv package, my python crashed. However no error message was shown on my terminal. I can use the normed method TM_CCOEFF_NOMRED without any issue. I really need the implementation of…
Sirius
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Recognize hand drawn shape in OpenCV

I have the following task: recognize a set of simple hand-drawn shapes on a sheet of paper from a still image (not a video stream), so they might not be exactly identically pixelwise. Those shapes are basically symbols for doors, windows, etc. in a…
Paul Latzelsperger
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