Messages

1

General / Multi-convergence problem with bundle

« on: February 05, 2016, 11:25:46 AM »

Hi,

The bundle adjustment in Agisoft seems to work quite well for small block e.g. 500m x 500m for our data. But as the block size increases to around 1000m x 1000m, the bundle adjustment runs into multi-convergence problem. That is, it converges to a solution that's not correct, with patches of tie-points floating at heights which are obviously not where the ground structures should be.

We have pretty good knowledge of the heights (min, max) of the area that we are surveying. Is there any way that we can tell Agisoft to obey some height constraints during the bundle adjustment?

Thanks.

Jason

2

Python and Java API / exportMatches using Python Script API?

« on: December 02, 2015, 04:45:11 AM »

Hi,

Is there any way to export matches (as orima format, for example) using Python Script API? I could not find an exportMatches function for a Chunk in the API doc.

Thanks very much in advance.

Regards
Jason

3

Python and Java API / exportMatches using Python Script API?

« on: November 16, 2015, 01:06:44 PM »

Hi,

Can we export feature matches using Python script API?

By feature matches I mean some feature point (x1,y1) on image 1 is matching (x2,y2) on image 2, like what's showing in Agisoft in the attached screenshot. The information is obviously stored somewhere in memory, but we just cannot find any means to extract it.

Thank you very much in advance.

Jason

4

Python and Java API / Re: when using refineMatches?

« on: October 21, 2015, 06:50:59 AM »

Resurrecting an old thread.

Can the developers of Agisoft PhotoScan clarify whether this function works or not as of latest stable version (1.1.6.2038)? What does it do?

I just read about this in the Agisoft Python API doc. It has almost no details. And the function cannot be called from the GUI.

5

General / Re: Reprojection Error for each point of the sparse point cloud

« on: October 15, 2015, 10:02:30 AM »

Thanks. I didn't see that math.sqrt.

6

General / Re: Reprojection Error for each point of the sparse point cloud

« on: October 14, 2015, 11:43:23 AM »

Hello jason.liu,

It's in pixels.

Just another dumb question: wouldn't it be in pixel square? since in the code you did norm()**2

7

Python and Java API / Debugging python code in Agisoft?

« on: October 12, 2015, 11:38:15 AM »

Hi,

Is there any way to debug Python code running inside Agisoft (e.g. step over, step into, step out, and peek at variable values during execution)?

Currently I have just been doing lots of print statements.

Thanks in advance.
Jason

8

General / How to put constraints on photo alignment?

« on: October 12, 2015, 04:58:22 AM »

Hi,

I have a number of geo-tagged photos from an ariel survey. The geo-tagged information are (x,y,z,roll,pitch,yaw) with a known precision. When Agisoft aligns these photos, it adjusts the (x,y,z,roll,pitch,yaw) way too much for some of these photos. Is there any way I can put some constraints on the photo alignment to tell Agisoft to adjust (x,y,z,roll,pitch,yaw) within certain bounds?

Thanks in advance.
Jason

9

General / Re: Reprojection Error for each point of the sparse point cloud

« on: September 29, 2015, 12:22:42 PM »

What unit is the reprojection error in?

10

General / Re: export tie points as XYZ

« on: September 02, 2015, 04:40:28 AM »

Hi Alexey,

I would like to know the xyz world coordinates for each tie point.

In the tie point export file (orima format for example), there is

[image label], [tie point ID], [tie point image x], [tie point image y], 0, M

It would be great if there is something like

[image label], [tie point ID], [tie point image x], [tie point image y], [tie point world x], [tie point world y], [tie point world z], 0, M

Or alternatively in the sparse cloud point export, there is information to link to the tie point information for each sparse cloud point.

How would i achieve that using Python scripts?

Many thanks for your help.

Jason

11

General / Re: export tie points as XYZ

« on: September 01, 2015, 07:07:09 AM »

Hi Alexey,

Many thanks for your reply.

Is there any way I can find out which point in the sparse cloud correspond to which tie point?

Cheers
Jason

12

General / export tie points as XYZ

« on: August 31, 2015, 10:45:04 AM »

Hi,

Is there any way I can export tie points in Photoscan as xyz in world coordinates instead of xy in image coordinates? I notice that I can export both sparse and dense cloud points as xyz in world coordinates. So I thought I can do the same for tie points. But I just can't find the function to do so.

Thanks in advance for any help.

Cheers
Jason

13

General / Orima matches export - what do the fields mean?

« on: July 28, 2015, 11:38:11 AM »

Hi,
I am quite new to photogrammetry. I am just wondering if anyone can tell me what the fields in the orima matches (tie point) export file mean? It looks like this:

0001_cam1_00001194.jpg           10818         -7.8605          6.9360   0   M
0001_cam1_00001194.jpg           10819         -5.1143          6.8573   0   M
0001_cam1_00001194.jpg           10820          6.0736          6.8655   0   M

I figured the first column is image file name. Is second column tie point ID? What are third and fourth column and what unit are they in?

Thanks in advance.

Jason