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« on: December 03, 2014, 06:00:10 AM »
Marcel and James,
First, Thank you. Thank you. Also, before I forget Thank you.
I appreciate your advice and want to make certain that I understand it. FYI… I don’t specifically care about modeling my house. I am using it primarily as practice. I would like to model endangered civil rights sites as an historical record in case they collapse (but that would probably be separate from my high school class).
Marcel: “Try photographing multiple 'rows'. This way, the features Photoscan can use to align the images are always visible in multiple photos. So photograph one row with the tripod at the lowest setting, one row at medium setting and one row with the tripod at the highest setting. Try to keep the distance to the house the same.”
Just to be clear, by lowest, medium and highest, you are talking about the height of the tripod and nothing related to image quality, correct? That is, all pictures are from the same row but there should be three sets taken at different heights? If so, could I get close up detail by just zooming it?
My first set of 16 pictures were basically from single row (with the same height). These pictures aligned, but there were two problems (that I hoped to correct by simply taking more pictures). First, I wanted more close up detail for when you zoom in on the model. I saw an Agisoft face model where you can see individual pores in the face. I would look to be able to do this level of detail in a building (and was hoping I could do it with just one camera as buildings don’t move). Second, the bushes were partially blocking the building (and the model of the back of the bushes was very blotchy/didn’t really exist). I thought I needed more angles of the bushes. (I would prefer that they weren’t even there)
The pictures were taken at 100 ISO. I am not really certain what aperture means but will look it up. Maybe I need a new lens for a “bigger than F8”. I was thinking that because Agisoft reported an image quality between .7 and 1.3, it meant everything was OK. Is that not the case?
James: Wow. Just wow. Thanks for aligning the pictures. Wow.
Your point on shorter focal length… Again I am going to need to look this up to understand it. Is a shorter focal length always your suggestion or simply here because of space?
If I want close up detail (like pores in a face), does that mean I have to take many, many pictures in order for there to be overlap? I am concerned that the images may be too similar (for example nearly identical shingles in a house) and Agisoft would quickly get confused on how to align the pictures?
Your advice on how to align the pictures is massive! I am going to try your suggestions to see if I can do it myself. Thanks.
Finally, there was a time gap between pictures being taken (30 minutes?). Does that matter?
Thanks. Thanks. Thanks.
One last point, I am having a bit of trouble downloading the file you posted to Dropbox. It says that it was unable to open the file. Is the problem on my end or do you think there may be something wrong with the file.
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Thanks in advance. 