It is possible to limit the low overlap areas that should not be included in the DSM and Orthomosaic generation, due to their low quality.
In order to do so, you can draw either a point cloud densification area or an orthomosaic area:
A point cloud densification area will exclude the low overlap areas both from step 2. Point Cloud Densification and step 3. DSM and Orthomosaic Generation.
An orthomosaic area will only exclude the low overlap areas from Step 3. DSM and orthomosaic generation.
You can draw a point cloud densification area before or after processing step 1. Intial Processing. In this case, the point cloud generated will be generated only for the area included in the point cloud densification area.
If the point cloud densification area is drawn after processing step 2. Point Cloud Desnification, then it will only affect the densified point cloud that is visualized in the 3D view of the rayCLoud, but the point cloud of the entire area will be generated and saved in the disc.
For step by step instructions on how to draw the point cloud densification area:
Before processing step 1: https://support.pix4d.com/hc/en-us/articles/202560179
After step 1 is done: https://support.pix4d.com/hc/en-us/articles/202560589
The orthomosaic area can be generated before processing or after processing step 3. DSM and Orthomosaic Generation.
If the orthomosaic area is generated before processing, then the DSM and Orthomosaic will be generated only for the area included in the orthomosaic area.
If the orthomosaic area is generated after processing, then the orthomosaic should be blended again in order to include only the area in the orthomosaic area.
For step by step instructions on how to raw the orthomosaic area: https://support.pix4d.com/hc/en-us/articles/202560209