Bob, Can you supply a smallish version of the straight stitched image 
without any perspective correction or cropping, together with the 
horizontal fov specified when generating the output image?  You should only 
need a total of 2 horizontal and 2 vertical line control points to correct 
it.

John

On Friday, October 11, 2013 4:30:51 PM UTC+1, Bob Mahar wrote:
>
>
>
> On Wednesday, October 9, 2013 12:45:08 PM UTC-4, Felix Hagemann wrote:
>>
>>
>> Just a wild guess: What is the output projection you are using? 
>> Horizontal lines only do are "real" horizontal lines in rectilinear 
>> protection.
>>
> rectilinear.   I've not found any solution as yet.  Its east to fix in 
> post, though you deal with some residual distortion. You can re-process the 
> resulting single image, as mentioned, and it does fix it.   But for 
> multi-shot panoramas, it sees as if there is a critical angle past which it 
> will not recognize the horizontal lines and adding them manually does not 
> seem to correct the situation.   I re-processed some of the older ones I 
> did with less acute perspective skew, and they did result in the 
> perspective being corrected.   I'd just like to find if there is a setting 
> to adjust that threshold.   I guess I could pre-rotate the image.
>
> -- Bob
>

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