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2016-03-07 08:41:13 -0500 commented answer Missing HOG Cascade in Ver 3

It seems that HOGCascade implementation in opencv2.4 is similar to this approach: "Fast Human Detection Using a Cascade of Histograms of Oriented Gradients" http://lear.inrialpes.fr/people/trigg...

So, it seems that in contrast to what @Dikay900 and @vpisarev mentioned, it is a valid implementation.

2016-03-07 08:40:39 -0500 answered a question Missing HOG Cascade in Ver 3

It seems that HOGCascade implementation in opencv2.4 is similar to this approach: "Fast Human Detection Using a Cascade of Histograms of Oriented Gradients" http://lear.inrialpes.fr/people/trigg...

So, it seems that in contrast to what @Dikay900 and @vpisarev mentioned, it is a valid implementation.

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2015-09-24 06:47:06 -0500 commented answer Missing HOG Cascade in Ver 3

I think instead of dropping, the author of the code can write a document and describe the method.

2015-09-24 06:30:43 -0500 commented answer Missing HOG Cascade in Ver 3

They mentioned that "The implemented HOG features are quite weird - different from Dalal's interpretation of HOG, different from P. Dollar integral channel features"

I don't understand why it should be omitted if it is not the same as Dalal's interpretation!!! It was working very good and in many cases the results were better than Haar cascade and LBP!!

2015-09-24 05:54:23 -0500 commented question Missing HOG Cascade in Ver 3

I've edited the question

2015-09-24 05:19:08 -0500 asked a question Missing HOG Cascade in Ver 3

It seems that opencv 3 no longer support HOG Cascade. Why is that?

in cascadedetect.cpp:

if( featureTypeStr == CC_HAAR )
    featureType = FeatureEvaluator::HAAR;
else if( featureTypeStr == CC_LBP )
    featureType = FeatureEvaluator::LBP;
else if( featureTypeStr == CC_HOG )
{
    featureType = FeatureEvaluator::HOG;
    CV_Error(Error::StsNotImplemented, "HOG cascade is not supported in 3.0");
}
else
    return false;

It was working very good and in many cases the results were better than Haar cascade and LBP!! Moreover, the training time was very good (in my experience 20 times faster than Haar and 2 times faster than LBP).

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2015-05-29 04:51:32 -0500 commented question camera diagonal angle of view knowing camera intrinsic parameter

@Theoretiker Thanks for your comment. but I don't have these values! apertureWidth – Physical width in mm of the sensor. apertureHeight – Physical height in mm of the sensor.

Do you know how can i find that for Logitech c905 camera?

2015-05-29 04:46:39 -0500 commented answer image coordinate to world coordinate opencv

Thanks for your complete answer. Is it possible that instead of using solvepnp I fill rvec and tvec? Based on IMU data?

I have the rotation [Roll, Pitch, Yaw] and transition from the Z=0 plane which is [X, Y, Z].

If it is possible could you briefly tell me how can i fill rvec and tvec?

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2015-05-28 04:32:38 -0500 asked a question image coordinate to world coordinate opencv

I calibrated my mono camera using opencv. Now I know the camera intrinsic matrix and distortion coefs [K1, K2, P1 ,P2,K3 ,K4, K5, K6] of my camera. Assuming that camera is place in [x, y, z] with [Roll, Pitch, Yaw] rotations. how can I get each pixel in world coordinate when the camera is looking on the floor [z=0].

image description

2015-05-28 04:02:36 -0500 asked a question camera diagonal angle of view knowing camera intrinsic parameter

After using opencv camera calibration, I do have the intrinsic and distortion_coefs of my camera. Is there an easy way to calculate the diagonal angle of view for my camera?

2012-12-28 09:52:19 -0500 asked a question Captured image viewpoint changing

i have a picture that captured from a fixed position [X Y Z] and angle [Pitch Yaw Roll] and a focal length of F (i think this information is called camera matrix)

enter image description here

i want to change the captured picture to a different position like it was taken in up position

the result image should be like:

enter image description here

in fact i have picture taken from this position:

enter image description here

and i want to change my picture in a way that it was taken in this position:

enter image description here

i hope that i could express my problem.

thnx in advance