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Bird's Eye homography height & scale?

asked 2014-07-30 16:49:15 -0500

jfix gravatar image

I've created a bird's eye view of my 640x360 video stream by following example 12-1 in "Learning OpenCV" by Bradski & Kaehler (I had to make some minor changes to play nice with v2.4.9).

I have to manually play with the height in the homography matrix each time in order for the bird's eye view to look (almost) right. It seems to depend on the location of the chessboard on the ground. Also, the result is much smaller than the original image.

How can I...

  1. Automatically find the correct height?
  2. Keep the scale closer to the original size? (I know there will be some loss)

Note, I'm coding with C++, Visual Studio 2013 (w/ platform toolset set to VS2010), and OpenCV v2.4.9

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Just a remark, if the example is also in the C++ samples directory, could you submit your changes using a pull request? It would help others with a great deal making sure everything works for the 2.4.9 interface.

StevenPuttemans gravatar imageStevenPuttemans ( 2014-07-31 02:59:55 -0500 )edit

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answered 2017-11-13 11:30:54 -0500


I am working on same project. I have to create a surround view image. Can will please give me your code in c++ as I am stuck with the c++ implementation of the code.

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Asked: 2014-07-30 16:49:15 -0500

Seen: 653 times

Last updated: Aug 01 '14