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How to Pass points to cvFitEllipse2 in OpenCV


How to Pass points to cvFitEllipse2 in OpenCV

By : Philip Bijker
Date : November 19 2020, 03:59 PM
this one helps. I am new to OpenCV, I have array of CGPoints and I need to pass those values to cvFitEllipse2, how to pass those values? Right now I am getting exception if I pass like below , try this:
code :
std::vector<cv::Point> contours;
contours.resize(self.points.count);
for(int i = 0 ; i < self.points.count ; i++)
{
    CGPoint point = [self.points objectAtIndex:i];
    cv::Point val;
    val.x = point.x;
    val.y = point.y;
    contours[i] = val;
}

cv::RotatedRect rect = cv::fitEllipse(contours);


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How to pass points into cvBoundingRect() in OpenCV?

How to pass points into cvBoundingRect() in OpenCV?


By : user3306296
Date : March 29 2020, 07:55 AM
I wish did fix the issue. Here is a page that describes operations on cvSeqs. It has a function to create one, and then a function to push a point on to it, which you can call twice. cvBoundingRect() can then take that cvSeq as a parameter.
What data does cvFitEllipse2 in javacv expect?

What data does cvFitEllipse2 in javacv expect?


By : Solomon Wilde
Date : March 29 2020, 07:55 AM
This might help you I have found a solution to my problem using a simple float array instead. Here's my solution:
code :
//6  2D-points stored in a 1-dimensional float array
float points[] = { 1.0f, 1.1f, 1.0f, 3.0f, 3.0f, 7.0f, 7.0f, 3.0f, 3.0f, 0.0f, 2.0f,       1.0f,1.0f, 0.0f};
//1 row matrix with 6 2-D points of type CV_32FC2 and a FloatPointer to the points array.
CvMat mat = cvMat(1, 6, CV_32FC2, new FloatPointer(points));
CvBox2D result = cvFitEllipse2(mat);
System.out.println(result);
Project image points to object points with opencv 3.0.0 beta

Project image points to object points with opencv 3.0.0 beta


By : Nikolay Nenov
Date : March 29 2020, 07:55 AM
I wish did fix the issue. To resolve my problem, I implemented my own reprojection function. This function is the inverse of fisheye::projectPoint. It is specific to my problem because the distance between my 3D point and the origin is known.
Micka for yours comments.
Using OpenCV to Solve for Transform between non planar object Points and image points

Using OpenCV to Solve for Transform between non planar object Points and image points


By : phanjo33
Date : March 29 2020, 07:55 AM
Any of those help (Sorry forgot to follow up on this)
Calculate the determinant of the rotation matrix. It should be =1 for a 'correct' answer and -1 for the flipped one. Then simply multiply the rotation by a identity matrix where the last term is the determinant. this does nothing if the det() =1 but flips it back to the correct answer if the det() is = -1
Choose my own points instead of corner points in implementing optical flow in opencv python

Choose my own points instead of corner points in implementing optical flow in opencv python


By : Martin Pellicore
Date : March 29 2020, 07:55 AM
I wish this help you Just as Mark Miller mentioned, You can use any feature vector as input points. cv2.calcOpticalFlowPyrLK will use them to find on the new image new locations of those features by comparing patches of pixels around given coordinates.
To save the new ones You need to catch the returned values of cv2.calcOpticalFlowPyrLK
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