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Questions tagged [vision]

Methods to acquire, analyze and understand images using mathematical approaches.

664 questions
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Android Vision Api - Barcode detection how to get type of barcode?

I am working with Android Google Vision API, and have created a standard barcode reader, but I want to detect what type/format of barcode is read i.e. CODE 39, CODE 128, QR Code.... etc. Is there anyway to return the type? Thanks
Dino
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How to implement Sobel operator

I have implemented Sobel operator in vertical direction. But the result which I am getting is very poor. I have attached my code below. int mask_size= 3; char mask [3][3]= {{-1,0,1},{-2,0,2},{-1,0,1}}; void sobel(Mat input_image) { /**Padding…
Abhishek
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Camera Error 2 when using Vision API (barcode scanning)

i don´t know why i am getting an Camera Error 2 when App starts... The App should have a CameraPreview where i can detect a Barcode and after detection i want to use the Data (e.g. in a Toast oder other places). Where does the problem occur? Error…
skm
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How to turn on the torch/flashlight with GooglePlay Services Vision API Xamarin Android

I have been trying to implement the flashlight/torch feature of the camera using the GooglePlay Services Vision API (using Nuget from Visual Studio) for the past few days without success. I have noticed that there is a GitHub implementation of this…
Gustavo Baiocchi Costa
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Google Vision API's label detection

Problem 1: I'm using Vision API's label detection and I'm getting the following error: "HttpError 429 when requesting https://vision.googleapis.com/v1/images:annotate?alt=json returned "Insufficient tokens for quota group and limit…
Pedro Lobito
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Change 8-connectivity of pixels in an image to 4-connectivity

I have a BW image containing a 8-Connected path The image needs to be changed such that there is a 4-connectivity between the pixels, i.e. one can traverse the whole path without going diagonally. This process needs to be done using morphological…
Hassaan Ahmad
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OpenCV: Drawing on an image

I am working on a program using the OpenCV library (though I am quite a noob on it). One of the things I need to do is to draw on the image. I looked at the OpenCV drawing functions and they all seem pretty simple (Circle, Line, etc), however the…
Juls
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How can I detect a grid of filled circles?

Given an image of a connect-4 board I'd like to recognize and output the board's state (a 6 by 7 matrix). The first approach I tried was based on finding the circles and then looking for a grid pattern in their centroids. This is the open-cv…
M.R.
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Access OpenCV two cameras with single USB port (stereo camera)

I am using the OVRVision camera (http://ovrvision.com/). It basically consists of two cameras, but on one USB port. They both have their own device Id in OpenCV, however, I can't open both at the same time: videoCaptureLeft = new…
Progga
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Are there any programs for prototyping computer vision pipelines?

Are there any pieces of software available for prototyping computer vision pipelines that don't require coding. I've tried this http://www.cassandra-vision.com/ but It's not very easy to use. I'd like to make a pro's and cons list of different…
SvaLopLop
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selecting channels in calchist opencv

I have the code for computing the histogram for hsv and yuv images. As am trying to obtain values corresponding to brightness alone, I want the 'v' channel value from hsv image and luma ('y') channel value from yuv image. this is the code I have…
Lakshmi Narayanan
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OpenCV: finding the coordinates of intersections of lines in the photo

I'm just starting to learn OpenCV programming. I would like to know if it is possible to get coordinates of intersections of lines (veins) from this photo. http://mormometricanalysis.wu.cz/photo.JPG In the photo there are marked needed points with…
cernover
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Camera and Image recognition

I recently watched a youtube video where a guy got a camera to recognize when a rubik's cube was held up to it, and it captured the 9 square color combination before snapping a picture of the cube and displaying the 3x3 grid on the screen of his…
kjh
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finding transformation between camera positions if the transformation between two images is known

I have been given two images of a building.I know the transformation between these two images and I also know the coordinates of first camera position with respect to some coordinate frame , how can I get the camera coordinates of the second image…
Mukesh
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how to prevent coloring a specific area of an image in Swift?

I'm learning CoreImage and Vision libraries in iOS by implementing a coloring app. The app shows a sketch with white background and black edges to the user to color, such as this image: I can color a view using Canvas and specify the line width and…
abs8090
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