Introduction
- What is image annotation?
- it is a way to remove parts of the image such as the sky, trees, or anything else you find that you'd like to remove
- What Phase of processing is this performed?
- this is done after the initial processing
- What types of image annotations?
- One type of annotations but 3 types of masks
- Carve- All the 3D points located on the ray cloud bassed on annotation are removed, great for sky removal
- Mask-Pixels are not used for processing- good to remove objects
- Global Mask- annotated pixels will not be used in any photo great for removing landing grear thats caught in multiple photos.
Methodology
- I uploaded the data given to Pix4D and then following the help pages online annotated 2 images. Figure one is showing the initial processing on the tower prior to annotations
Figure 1- Figure 2 shows after id annotated a image the pixels disappearing on the main picture. the annotated area is shown on the left side of the image. To do this i mostly used the carve option to remove large areas of grass
Figure 2- After the annotation was done i then proceeded to do the processing again and the final product of the pole are seen in Figure 3 and Figure 4. As you can see a few too many of the pixels in the center of the pole were removed making the one part look empty and a few random pixes shown around the outside.
Figure 3
Figure 4- The next image that was done was a picture of a truck in a empty parking lot. figure 5 shows the truck after all the annotations was done and during the second step in processing.
- Figure 6 and figure 7 are the final products of the truck after the processing was done.
Conclusion
- 3D imagery is useful if trying to show a bridge of construction project and how its looking in 3d, its not super pretty yet and does require a lot of work and processing but the outcome is pretty useful to construction companies. I found it hard to get narrow objects to render in well while large objects were easy to work with. This is most useful to create 3D images of building or dig sites hard to use for poles and smaller objects.
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