Questions tagged [computer-vision]

Computer vision is a field that includes methods for acquiring, processing, analyzing, and understanding images and, in general, high-dimensional data from the real world in order to produce numerical or symbolic information, e.g., in the forms of decisions. From Wikipedia: http://en.wikipedia.org/wiki/Computer_vision

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Move the onscreen circle when camera moves

I have a script that accesses my webcam and displays the captured video on the screen. I can also very easily draw a circle (a rectangle, it doesn't matter) over the video. When I move the camera ...
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1answer
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Designing a facial recognition systems database

First of all, I hope im in the right stack exchange. So I'm trying to build a facial recognition system, e.g. one that recognizes a face and compares it to a database of known faces. For the first ...
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1answer
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What techniques are there to detect the objects direction of travel?

I have been looking into object detection and tracking for a project that I am working on but I can't yet seem to find any techniques that I can make use of to utilise the information from object ...
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1answer
633 views

Web GUI for Python scripts

I have several but independent computer vision pipelines which were original planned to run by a user via a cmd (task1 -> script_1.py, task2 -> script_2.py and so on). All pipelines share some code (...
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2answers
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Logging/Debugging of computer vision apps

When I'm writing an computer-vision program (using OpenCV and Python) I need to print/show a lot of intermediate results in form of images (using cv2.imshow(..)) for debugging purposes to find out ...
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2answers
157 views

three overlapping project - how to organize

At the moment I am developing three scientific software projects (computer vision) in parallel in Python and scratching my head about organization, clean code and easy extensible/to maintain code. ...
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1answer
85 views

How can I detect a touch event in a computer-vision blob-tracking system?

Say I have a computer vision system capable of tracking multiple colored blobs. Further, assume I want the blobs to represent "fingers" in a multitouch system. Now, I have many examples I can look at ...
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2answers
1k views

Difference between Sfm and 3D reconstruction?

With respect to computer vision (CV), I always hear these three terms used almost interchangeably: Structure from motion (Sfm) 3D reconstruction Stereo vision/processing However from what I've read, ...
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Are the various branches of computer vision completely distinct? [closed]

Computer vision includes: Character recognition (converting an image to text) Face recognition (detecting a face in an image) Object recognition (detecting various objects in an image) Human ...
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2answers
371 views

How is it possible that facial recognition software can work, but a reCAPTCHA can't be solved by a computer

If software can be built to recognize faces and match those faces to names, then how is that CAPTCHA works? Recognizing letters seems a lot easier than matching faces.
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1answer
138 views

What algorithms would suit image colour summarization?

I would like to analyse a set of hundreds of thousands of product images (clothing, electronic goods etc) and retrieve the dominant colours in each. I'm only interested in the top 3 or 4 colours. The ...
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1answer
424 views

Which Computer Vision / Image Processing technique would solve light imbalance in images?

Given a colour image whose light intensity is dim at the edges and bright in the middle, such as [dim bright dim], which computer vision technique would be recommended to correct this imbalance? ...
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1answer
173 views

Measuring “novelty” of data

I have a heuristic in mind that should allow me to "score" data based on "novelty" that I would like to work in real-ish time. In this case, I mean novelty in the sense that the data source is ...
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5answers
208 views

shall a vector2 extends a vector3 or is it the opposite?

Perhaps the question might be tied to a theoritical or mathematical forum, but since it is for programming purpose, i ask here first: In a computer vision context, i write a couple of interfaces ...
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1answer
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What is watershed in the context of image processing?

I am new to image processing using Python. Now I am learning OpenCV and the mahotas module in Python. Many functions in these modules are related to watershed of an image. I don't know what ...
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2answers
652 views

Computer vision algorithms (how is this possible?)

I recently stumbled across a company that has created what appears to be a computer vision technology that is capable of detecting shoplifting automatically and alert its users. LINK Watching some ...
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1answer
117 views

Seperable Kernel, MMX/SSE and TCP Transmittal of them?

So I was reading about Java Convolve and someone said that it may be faster than the MMX / SSE implementation. In it one of the comments had a kernal array and said it was seperable. What is a ...
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1answer
166 views

Would this violate any copyright issues? [closed]

I am currently publishing a paper on skin detection. However, I need to find the appropriate histogram bin size for each colorspace. I recently came upon a paper that published what it found to be the ...
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1answer
2k views

Options within OpenCV related to image difference analysis and reporting

Scenario: Stationary view with sequential timestamped samples in 2D-color where the comparison is only done between one pair of neighboring samples. Background: Have never used OpenCV before, ...
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1answer
183 views

How could I implement multitouch gestures without a start event?

While working on multitouch, one of the problems I've run into is the fact that nobody seems to do gesture recognition without some kind of init event, whether it's a mouseclick or contact with a ...
0
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1answer
2k views

How can I make an app using mobile's camera to detect words? [closed]

I am trying to make an app that will capture the video from the mobile's camera and detect in real time all the text that will be captured. I would like to make it in C# (for e.g. Windows Mobile) but ...