Is there a Matlab version of the OpenCV function initUndist​ortRectify​Map()?

https://docs.opencv.org/3.4/da/d54/group__imgproc__transform.html#ga7dfb72c9cf9780a347fbe3d1c47e5d5a

I need the undistortion and rectification transformation maps for a project.

Answer 1

[Yuval Levental]

Answering my own question. There isn't such a function, but finding the (x, y) bounds and Homography matrices from ComputeRectificationParams.m, then using the Homography and undistortion equations, then using interp2 to move forward gives accurate rectification. See https://www.mathworks.com/help///visionhdl/ug/stereoscopic-rectification.html for details.

[ft28]

Hi Yuval, I am also looking for the mapx and mapy calculation like in OpenCV cvInitUndistortRectifyMap().

How did you solve that with using homography matrix and x,y bounds?

I received these information by using paramStruct = toStruct(stereoParams) and get H1, H2, XBounds, YBounds, but dont have any idea how to proceed now. Do you have any code to share?

Thx

Fatih

Answer 2

[Debasish Samal]

Hi,

The rectifyStereoImages function returns undistorted and rectified versions of the input images using the stereo parameters. I think, this is what you are looking for. Please refer to the documentation of the same to know more about the function.

Thanks.

-Debasish

[Yuval Levental]

Hello, I know about this function, but I need something that specifically returns the x and y transformation maps.

For instance, the Undistortion block outputs coordinates (u,v) at https://www.mathworks.com/help///visionhdl/ug/stereoscopic-rectification.html

Is there a similar command in Matlab?