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Messages - chrisd

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1
General / Re: export a cad version of a 3d building survey
« on: October 30, 2020, 04:24:29 AM »
You may not need a CAD model to do a comparison.

CloudCompare can do deviation comparison from point clouds or meshes.
The CAD model would need to be converted to a mesh because CloudCompare does not accept CAD formats.
A quick way to get a mesh would be to export from AutoCAD to an STL.

2
General / Re: Multi-Camera Rig for scanning Caves
« on: September 09, 2020, 03:57:28 AM »
If the camerars are all parallel I suspect that the effect is because the camera positions are observed from multiple locations.
Ideally, the cameras would be facing approx. normal to the wall of the passage, rather than all facing down the length of the passage.

3
General / Re: No points found for photo with detail
« on: December 30, 2019, 04:09:39 PM »
There are dark or low light areas in many of the images circled below although I don't think this is entirely the problem as you show you are getting some points
The stone appears to be somewhat translucent ... I think I see subsurface scattering in at least one image?

Do you use RAW images ... the extra few bits of image data can help.


More than likely there a few factors contributing to the problem.


4
General / Re: No points found for photo with detail
« on: December 30, 2019, 05:42:36 AM »
... lighting is always good.

The lighting appears fairly inconsistent from the images you have provided. You may wish to consider using supplemental lighting to improve results.

5
General / Re: Agisoft filling in bolt and rivet holes I need to see.
« on: July 08, 2019, 05:48:08 PM »
Steve,

I don't think you will get any direct or meaningful feedback without some example pictures.

6
General / Re: Agisoft filling in bolt and rivet holes I need to see.
« on: July 07, 2019, 06:32:48 PM »
Can you post some of your photos ... the files as they were saved from the camera?

 

7
Are you using raw images?

The image format is .jpeg caputred with the minimal amount of compression. There is no image manipulation / processing prior to loading into chunks in Metashape. ISO = 100 and the aperature and shutter speed are locked between photographs.

It appears raw is an option, at least in the hardware spec. I don't know that getting maybe 11 or 12 bits / channel instead of 8 will make any difference here though.

8
Hi Eichhorn,

Are you using raw images?

9
General / Re: Why my model is curved?
« on: March 03, 2019, 10:52:20 PM »
I threw out the 2 images that had the 180 deg rotation and there is still significant warping, so the lens specs may not be interpreted correctly from the images.
There is no EXIF data recorded with the image for comparison.

You probably will need to know the spec on the camera lens and use the AGIsoft Lens application (Tools menu) to do the calibration. I don't have any experience with calibrating the lens by this method so perhaps someone else could jump in here.

I understand these cameras were relatively low cost as they came with a video surveillance system, however, I think you would have a greater opportunity for a quality result with a different camera system.


10
General / Re: Why my model is curved?
« on: March 03, 2019, 06:53:49 PM »
If the cameras were all mounted as in my markup of your image, the ambiguity (180 deg rotation) of the cameras in relation to the subject would be eliminated. I think some of the warping could be attributed to this issue.




11
General / Re: Why my model is curved?
« on: March 03, 2019, 06:07:50 PM »
... and you would get best results from using RAW image format, not JPG. You would need to look at what cameras are available within your budget that can save this format.

CHDK can be used with some of the Canon point and shoot to get RAW images from the camera so you wouldn't necessarily need to spend $ on a pricier DSLR model.

12
General / Re: Why my model is curved?
« on: March 03, 2019, 04:40:21 PM »
Are these the full resolution images, not cropped or reduced?

13
General / Re: Why my model is curved?
« on: March 03, 2019, 04:01:27 PM »
Hi Ron,

I saw the pics in your post, I meant the actual images from the cameras you are using to build the model.


14
General / Re: Why my model is curved?
« on: March 03, 2019, 12:35:46 AM »
Hi Ron,

Can you upload the pictures?
Are the cameras all parallel?

15
General / Re: CAD Lines
« on: February 17, 2019, 06:09:57 PM »
Samir,

Maybe someone that uses Pro can help here to let you know if it is possible.
If you don't have Pro, I think you will need another application (ie. CloudCompare) to generate the lines.

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