Re: [hugin-ptx] Re: Converting Hugin pto lens parameters to OpenCV compatible ones

[Pavel Iacovlev]

Thank you a ton Thomas, with your input I was able to get pretty close to
what I need.

On Tue, Oct 17, 2017 at 6:41 PM, T. Modes  wrote:

>
>
> Am Montag, 16. Oktober 2017 22:49:55 UTC+2 schrieb Iacovlev Pavel:
>>
>> Full frame fisheye ? is that it ? not 100% sure.
>>
>
> For a full frame fisheye (but not e.g. for the stereographic fisheye) the
> following equation should be correct from Hugins point of view:
>
> var focalLengthMm = sensorSizeX / (hfov / 180 * Math.PI);
>
> var focalLengthPx = (focalLengthMm / 5.70) * w;
>
>
> But you are mixing constants and variables, e.q. you are calculating the
> sensorSizeX in the first place and then you are using the constant 5.7 in
> the last equation.
>
> And when you combine both equation you don't need sensorSizeX at all.
>
>
> Also I don't know if OpenCV/nvidia is using the same convention.
>
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Re: [hugin-ptx] Re: Converting Hugin pto lens parameters to OpenCV compatible ones

[T. Modes]

Am Montag, 16. Oktober 2017 22:49:55 UTC+2 schrieb Iacovlev Pavel:
>
> Full frame fisheye ? is that it ? not 100% sure.
>

For a full frame fisheye (but not e.g. for the stereographic fisheye) the 
following equation should be correct from Hugins point of view:

var focalLengthMm = sensorSizeX / (hfov / 180 * Math.PI);

var focalLengthPx = (focalLengthMm / 5.70) * w;


But you are mixing constants and variables, e.q. you are calculating the 
sensorSizeX in the first place and then you are using the constant 5.7 in 
the last equation. 

And when you combine both equation you don't need sensorSizeX at all.


Also I don't know if OpenCV/nvidia is using the same convention.

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Re: [hugin-ptx] Re: Converting Hugin pto lens parameters to OpenCV compatible ones

[T. Modes]

Am Montag, 16. Oktober 2017 22:12:05 UTC+2 schrieb Iacovlev Pavel:
>
> The projection is equirectangular, I have attached a screenshot of the 
> project tab from Hugin.
>
Sorry, but I was not clear enough. I was referring to the lens or input 
projection.
Equirectangular is the output projection.

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