971001 - how to dewarp a fisheye image?

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Using cameras like Bosch 5000 Panorama gives a fisheye image that we've to dewarp it. Some dewarping methods are suggested, but what I prefer is rectangular, that's giving a center which is a point on the image, an inner radius and an outer one will map the pixels inside the boundary to a destination rectangle.

1. I need the operation be done by GPU.
2. I think OpenCV or any other library may be available to do it, but I don't know how. Besides, I'm open to use a custom code.
3. I'm looking for such a thing: link
4. I'm looking for a C# solution.

Any suggestions are appreciated.

What I have tried:

I tried to map the pixels one by one from the whole image into the client rectangle, but I didn't get a good result. The perspective is evidently unnatural. Now I think that I need a rectangular solution.

Posted 21-Dec-18 22:36pm

ilostmyid2

Updated 22-Dec-18 0:45am

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2 solutions

Solution 1

See here: c# - Circular Fisheye Image dewarp to flat image - Stack Overflow[^] - you aren't going to find code which exactly does what you want, so you are going to have to use the transformation formulae given there and work out exactly what you need yourself.

Posted 22-Dec-18 0:31am

OriginalGriff

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ilostmyid2 22-Dec-18 6:58am

I had seen the url, but the output is not what I expect. It gives just a better shaped of the whole image. It doesn't do rectilinear dewarping.

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RickZeeland · Accepted Answer · 2018-12-22T00:46:00

Solution 2

It probably can be done with the Bosch Video SDK, but this is not for the faint hearted, see search results here: Search[^]

Posted 22-Dec-18 0:46am

RickZeeland

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ilostmyid2 22-Dec-18 6:59am

I couldn't find Bosch Video SDK in the search result.

ilostmyid2 22-Dec-18 7:03am

my search led me to:
https://ipp.boschsecurity.com/en/news-events/product-news/video-sdk-6-04/video-sdk
with everything other than suitable solution for this purpose

RickZeeland 22-Dec-18 7:14am

Websites are often not up to date, maybe it's best to contact Bosch directly although my experiences are that it's hard to get to a knowledgeable person. Told you: not for the fainthearted :)

ilostmyid2 22-Dec-18 7:25am

Calling me a fainthearted person and persisting on it is not certainly a good solution for the problem, is it?
Anyway, I've spent enough time on the available documents on the website and found not a valuable thing.

RickZeeland 22-Dec-18 7:40am

In contrary, I think you are not fainthearted as you don't seem to give up that easily, just meant that I struggled with Bosch support too. Good luck and merry Xmas !

ilostmyid2 22-Dec-18 7:56am

happy xmas 2u2. i still wonder why they avoid a good support while this decreases their customers.

ilostmyid2 22-Dec-18 7:37am

I don't know why they persist not to publicly deliver any useful technical document. I don't know what is the advantage of hiding them and what's the disadvantage of delivering them easily.

ilostmyid2 24-Dec-18 6:21am

I think you answered my question with mentioning to "Bosch Video SDK". After installing it, I found some sources in C# which may be used to solve the problem. Although this solution is specific to Bosch only, our customer is not going to use any other cameras at the moment.

RickZeeland 24-Dec-18 6:38am

Welcome to the wonderful world of VMS (Video Management System), we always struggled with Bosch camera's and DVR's because they did not do things in a standard way. If only all manufacturers would do things in a standardized way, like ONVIF and RTSP, our life would be a lot easier !

ilostmyid2 24-Dec-18 6:41am

I agree, but I think this is just an alternative. This camera as well as many other cameras from Bosch support Onvif. At least Bosch claims that they do. If I would know Onvif and how to work with the camera by using this protocol, I could get advantage of this without having to use Bosch Video SDK.

ilostmyid2 24-Dec-18 11:22am

Oh my! Just at the moment I thought I could succeed getting a correct image, I realized that this solution is not proper for me. Our software structure is client/server. Client-side is C# and if we would intend to get the correct image we could use this solution. But at the server-side, which is Linux, we connect to the cameras. When I reviewed the C# codes, I understood that rendering the control's surface is beyond our source control. It's done by the Bosch OCX'es and we have no access to the images/video. What I need is that the video may be got in Linux, recorded as a video stream to HDD, and be sent to client as a video stream. The worst case is when the servers are federated and client will have no access to the stream/camera. For this, I think we should be looking for another solution.
Any idea?

ilostmyid2 24-Dec-18 11:24am

In another words, we don't 'have' the video to save or transfer or to do anything with it. We may just 'see' it.

RickZeeland 24-Dec-18 12:14pm

I'm afraid I can not be of much help regarding Linux as our VMS is Windows only, the only thing I can think of is virtualization or something Dockerish. Another option might be just installing the Bosch client software and calling that from your application when needed. Not what you want to hear probably ...