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Messages - Phogi

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46
Python and Java API / select cameras by time
« on: August 16, 2018, 07:11:37 AM »
Hi Alexey,

Could you help me with sort camera by time in the python api? I tried

chunk = PhotoScan.app.document.chunk
cameras = chunk.cameras
cam_num = len(cameras)
chunk_N = 0
for i in range(0,cam_num-1,1):
    timestamp = time.mktime(time.strptime(cameras.photo.meta['Exif/DateTime'], '%Y:%m:%d %H:%M:%S'))
    timestamp_next = time.mktime(time.strptime(cameras[i+1].photo.meta['Exif/DateTime'], '%Y:%m:%d %H:%M:%S'))
    if (timestamp_next - timestamp) <= 60:
        cameras.selected = True
        cameras[i+1].selected = True
    else:
        cameras[i+1].selected = False
        break

But it is always not select the cameras, and sometimes select wrong cameras depending on the camera names. I am assuming it needs to sort by time first, however getting a list of camera time does not store the camera id correspondingly.

Thanks a lot for your help,

Kind regards,

47
General / Adaptive Camera Model Fitting which step
« on: April 11, 2018, 03:49:29 AM »
Hi Alexey,

In v1.4, the Adaptive camera model fitting option appears in both "Align Photos" and in "optimise cameras". Is there any difference? As in some threads it is mentioned rolling shutter should be in the sensor so it was moved out from optimising options, but what is the "Adaptive camera model" fitting option does now?

Thanks for your explanations and support!

Regards,

48
General / Re: Camera FC6310 model problem
« on: April 05, 2018, 09:48:23 AM »
Hi Alexey,

I send to support@agisoft.com, do you get the report? Thank you very much!

49
General / Re: Camera FC6310 model problem
« on: April 05, 2018, 09:14:55 AM »
Hello Alexey,

Should I send to support@agisoft.com?

50
General / Camera FC6310 model problem
« on: April 05, 2018, 02:55:43 AM »
Hi Alexey,

I got a flight with photo ratio 16:9, with camera model FC6310. I found Agisoft has some weirdness to add GCP for this kind of photos, each GCP left as checkpoint will have very large RMS, while involved it in the RMS will be very small. However the checkpoints on the site will be still off.

Is there any bug or special settings needed for this kind of photos?

Thanks

51
General / Re: Multiple F/stop and shutter settings with large GCP RMS
« on: March 02, 2018, 06:52:09 AM »
Hi Alexey,

May I ask if the pixel size in camera calibration impact the results much? Since Agisoft automatically calculated the pixel size is 0.00252687mm, while from EXIFtool I see it is x resolution 72 with unit inches, and the photo resolution is 5472*3078. Will this needed to recalculate? I found other posts mentioned 1/FocalPlaneXResolution, while this is way larger than the one calculated automatically, or different in sensor size/pixel.

Thanks,

52
General / Re: Multiple F/stop and shutter settings with large GCP RMS
« on: February 28, 2018, 01:14:27 AM »
Hi SAV,

I tried to assign different weights to the markers, but it doesn't work much (as the weights are similar to each other). There are always GCP reaches 0.3m RMS. I also tried to erase the geotags and realign, while this doesn't improve the results. Any suggestions on the settings/camera model/ optimisings are much appreciated!

53
General / Re: Multiple F/stop and shutter settings with large GCP RMS
« on: February 27, 2018, 09:52:13 AM »
Hi SAV,

Thank you, the GCP RMS are values after optimised. This is assigning the weight as 0.005m for all the GCPs. Also, the GSD should have accuracy higher than 0.3m. The accuracy of GCPs would be a good try, however, what worried me a bit is the camera model, as if on there are some checkpoints measured along the road but they are 1m lower than the results. Would there be any settings in the camera optimising part need to be cautious? One thing here is the shutter speed changes due to lights, should I change the calibrations before aligning the photos?

Thank you so much.

54
General / Re: Multiple F/stop and shutter settings with large GCP RMS
« on: February 27, 2018, 03:00:45 AM »
Hi JMR,

Thanks, attached is the RMS and camera locations. Camera model is FC6310, is there any special settings or precalibrations needed to be done for this?

Thanks,

55
General / Re: Multiple F/stop and shutter settings with large GCP RMS
« on: February 26, 2018, 07:44:20 AM »
Hi SAV,

The GCPs are RTK surveyed GCPs, with spread across the area. Photos are DJI drone.

For the settings I'm using default 10m for camera and 0.005m for marker, which works well before. However for this time if I use the default it would have large variance in E/N/H. Also what I notice is fit "rolling shutter" will bring huge distortion to the model...



56
General / Re: Multiple F/stop and shutter settings with large GCP RMS
« on: February 25, 2018, 04:16:44 PM »
Thank you JMR!

However, I checked the markers were marked correctly. The GCP rms are having some discrepancy with the photos, and some photos at the edge have East rms at about -10m, and the GCP at that area has -7m rms in Easting. If I use default marker accuracy I'll get about 1m average error, and if I set marker accuracy to 0.002m the internal rms will be small (less than 5cm), but leaving any one of GCP as check point it will have a 1m height difference.

Does anyone have met this before and any suggestions would be much appreciated!

57
General / Multiple F/stop and shutter settings with large GCP RMS
« on: February 24, 2018, 05:06:27 PM »
Hi Alexey,

I have had a project with multiple flights due to the area is large, also the F/stop and shutter speed have some changes during the flights. However, the aligned photos have large discrepancy when marked with GCPs and reoptimised. The RMS of the GCPs are always at 0.2m to 1m in Agisoft. Is it related with the F/stop? What I notice is Agisoft treat the cameras into different groups in the camera calibration, is there any suggestions to get a smaller RMS with GCPs?

Another issue I found it once I ticked " with rolling shutter" it will bring about 50m RMS for cameras, do you have any suggestions?

Thank you so much!

58
Bug Reports / Re: GCP unchecked but will impact in camera reoptimising
« on: February 05, 2018, 03:16:06 AM »
Hello Alexey,

Thanks for the reply, apologise I missed the email notification! Since the 3D locations are reprojected, the GCP locations will be added in the reprojection with the weight, is there any other projections in the images will be forced to involve in near the GCPs to georeference the dense point cloud?

Thanks,

59
Bug Reports / Re: GCP unchecked but will impact in camera reoptimising
« on: January 31, 2018, 08:08:17 AM »
Hi Alexey,

So after some test runnings, I found the projections are not changing significantly to the point clouds. However, this raised me a question: how does the GCP values involved in the point cloud reconstruction? Does it just georeference the GCP coordinate to the sparse point clouds model, or it recalculate the points near the camera projections with the weight assigned? The first case looks like georeference the Lidar data with GCPs and rectifying, but if in the second case could we know how much area of the points will be impacted by the GCP while the other locations still impacted by the camera model?

Thanks,

60
Bug Reports / Re: GCP unchecked but will impact in camera reoptimising
« on: January 29, 2018, 12:56:43 PM »
Hi Alexey,

Thanks, but the projections are some hints of the data quality which related with the final DEM generated is it? If the camera RMS is higher, then the reoptimised RMS with unchecked GCP location will be different with "remove" the GCP at that location then, is this possible?

Thanks, for the GCP will it's weight impact on the nearest points reconstructed or there's a rule to georeference the point clouds later?\

Thanks,

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