Tagged Questions

OpenCV (Open Source Computer Vision) is a cross-platform library of programming functions for real time computer vision. It was officially launched by Intel in 1999 and is now supported by Willow Garage. Uses include: Human-Computer Interaction; Object Identification, Segmentation and ...

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Nested samples in machine learning training in OpenCV

I've been messing around with with Neural Networks (MLP) OpenCV and I have a problem, I have sets of coordinates [[x1, y1], [x2, y2] .. [xn, yn]], [[x1, y1], [x2, y2] .. [xn, yn]], [[x1, y1], [x2, ...
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1answer
14 views

cv::Mat matrix, HOW TO Reduce digits to the right of the decimal point in cv::Mat?

I have an app that prints a 3x3 cv::Mat on the iPhone screen. I need to reduce the decimals, as the screen is not so big, see: [1.004596557012473, -0.003116992336797859, 5.936915104939593; ...
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9 views

iOS Drawing detection with Open CV [closed]

I need to extract pixels of a drawing drawn on a solid colored paper. First user will take a picture of this drawing with a camera and use the JPG/PNG image as input to the app. It is going to be an ...
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0answers
33 views

How to overlay multiple images on a template in C++ [closed]

So i'm trying to convert a PHP program I wrote to c++, and in PHP overlaying images is as simple as using the: imagecreatefrompng imagealphablending imagecopy features. However, when it comes to ...
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1answer
27 views

Removing blobs from a binary image

I have a binary image which contain few blobs. I want to remove blobs which are less than a certain are. Can any one suggest me a way? I am using Open-CV. i did dilation and erosion to get those ...
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0answers
10 views

Disable the removal of keypoints near borders with GridAdapter?

I am using the GridAdaptedFeatureDetector( ... ) with ORB to have a better distribution of keypoints. The bad thing is that when you apply a grid all the points near the grid will get eliminated ...
1
vote
2answers
24 views

OpenCV: How to get the number of pixels?

How to get the number of pixels in an image? Following is my code, and I need to get the total number of pixels in Mat "m". int main() { Mat m = imread("C:/Users/Public/Pictures/Sample ...
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1answer
13 views

cvGetSize gives bad argument error

I'm trying to reduce the glare and light reflections from an image to then continue with some more image processing. I found a snippet of code online that supposedly works to select pixels in a range ...
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0answers
26 views

Opencv naive image match

I'm using OpenCV/EmguCV to perform a naive matching procedure. I've two images, img1 and img2, and I enumerate the translations and rotations of img1, and match against img2 to find the optimal ...
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1answer
20 views

Anyone knows how to convert a cv::Mat into a NSString?

I am using OpenCV in a iPhone project. In this application, I receive a 3x3 matrix from the Opencv function an need to transform it into a NSString. For example: cv::Mat myMatrix = ...
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votes
3answers
73 views

getting the type of parameters passed in a variable arguments list

I have written a function with variable argument list void cvShowMatImages( char* title, int nArgs, ...) // Mat Images where the argument to pass are openCV images. I have actually 2 different ...
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20 views

OpenCV Haar Detection problems

I'm trying to use the haar Cascade Classifier to find a face in an image and extract its center point , bit it seems to be not working with a certain set of images include the one below: ...
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1answer
22 views

what is the 4 char id for mpeg decoder in opencv

I want to create a mpeg4 stream whith the following specs: Container mp4.mov m4v Resolution 1920 X 1080 Codec h264 main profile 4.1 I am wondering what CV_FOURCC and file extension should I use? ...
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0answers
39 views

color object tracking in openCV keeps detecting the skin

What I intend to do is as follows: Fix a colored object. Track it across video frames using histogram-backprojection approach with camshift. I use the following code and it always ends up detecting ...
-1
votes
1answer
41 views

OpenCV vs Core Image [closed]

I have worked with Core Image, creating filters and stuff. Also I'm aware that Core Image has feature detection capability. I have also worked a bit with OpenCV, but not on a mobile device. Used it ...

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