Hello,I have a photoset of 600+ images with which to make a model but I made the mistake of using different focal lengths while taking the pictures. When I import them they are collated into folders of pictures with the same focal length. I have a point cloud as well; will this help in the construction of the model or not?
Thanks
Paul
Hi Paul,
Basically ContextCapture is pretty robust to compute different focal length and you may not encounter particular issues when you run an AT on such dataset. Photo are grouped by image size, focal value or sensor size so this is normal if you see some photogroups from a same dataset of photos taken at different focal length or if you have used different camera devices.
The point cloud should help for the reconstruction and especially for the resulted geometry but the texture will be extracted from the photos since they generally have a better color information.
Best regards,
Pierre
Thanks Pierre,
I was able to generate a reasonably good model from those pictures and I don't think the focal length was an issue in the end. I was using an 18-55mm lens so I was zooming in and out but do you think that a fixed lens would give better results?
Is mise,
Paul Carroll
A 18-55mm lens can give great result, if photos are not blurry (shutter speed above 1/100 seconds) and well-enough exposed that will do the job without any problem!
To answer your question, in general a prime lens gives better image quality than a zoom lens. Having said that the gain is not so drastic to be honest. If you use a fixed/prime lens you could expect to get better chromatic aberration correction and sharper details in borders, and that will slightly increase the global accuracy and texture aspect...slightly I said :)
I probably wouldn't even notice the difference!
Thanks again Pierre,