Problems with a Deck Project – Red X Photos
With the right layout of targets and good photo overlap, PhotoModeler will automatically detect the targets and orient all photos (i.e. solve the position and angle of the camera when each photo was taken). When the project solves, the target points become 3D points and the surface planes can then defined, and deck panel tracing can begin.
But sometimes, one or more photos don’t orient - a red X appears on the photo thumbnail to indicate this. When a photo is not oriented, no data can be extracted from it.
The Red X on a photo problem is usually due to one or more of the following:
In this document and the associated video, we will show how to recognize these types of problems by:
And then we can determine whether the project is:
Follow along in the video to see why a couple photos didn't orient and how we determine what to do next.
Below is a description of a set of steps to assess a problem project. The time code for the relevant clip in the video is shown. Scroll to the time in the video above, or click to view the part of the video in a new browser tab.
Once the project is assessed, we can determine if it's possible to correct the problem!
Assess the project - the example project was processed and we have a couple Red X photos (unoriented):
Note: PhotoModeler needs a minimum of six points in each photo (ideally 10-15 or more), with good spread across the photo, and these points need to be marked/detected on at least two photos (ideally three or more). See the Minimums Section in the online Help.
Possible reasons for a low point count:
Other reasons photos may not orient:
Is the project fixable?
If all of the required photos can't be oriented, perhaps the project can be split into separate projects.
If there are too many issues, it may be most efficient to start the project over. Re-arrange and/or add targets, take a new set of photos and launch a new project.
Look for regions of the deck where targets could be added, for better spread and target point count, even on areas that will not be modeled or measured. Adding targets in these areas will help with orientation as they will tie the sections of deck together. 4:34
Take photos from higher up and add some angled photos so that more of the deck is captured. This also helps tie various sections of the deck together. 4:44
Once you've diagnosed the problem, take note of where things went wrong. Make sure future projects have a good target layout with good spread. Also make sure photos have enough overlap and include some overview photos that help tie the scene together.
A good way to reduce orientation and other project problems, is to bring your laptop to the project site, load the photos and run the project. Seeing the initial result will help identify orientation problems before you remove targets and leave the marina. If need be, new photos (e.g. angled ones), can be taken to help cover longer sections of the deck to tie the model together. But remember, don't move targets around unless you're starting a new project.