It allows users to change the following processing options:
- Image scale: Defines the image size used to extract keypoints.
- Keypoints: Sets up the number of extracted keypoints.
- Internals confidence: To set the confidence of the initial camera calibration parameters.
- Reoptimize cameras: Fast reprocess the project after applying changes to Ground Control Points (GCPs).
Defines the image size at which keypoints are extracted in comparison to the initial size of images. It is possible to select:
- 1 (Original image size): This is the recommended Image scale.
- 1/2 (Half image size): A scale of 1/2 (half image size) can be used to speed up processing and for cameras with very high resolution.
- 1/4 (Quarter image size): To get a fast overview and to assess the completeness of the project, a scale of 1/4 (quarter image size) can be used to speed up processing.
- 1/8 (Eighth image size): To get a fast overview and to assess the completeness of the project, a scale of 1/8 (eighth image size) can be used to speed up processing.
Allows to set up the number of extracted keypoints.
- Auto (Default): Automatic way to select which keypoints are extracted.
- Custom: Directs PIX4Dmatic to identify a specific number of keypoints, image content permitting.
- Number of Keypoints: Maximum number of keypoints to be extracted per image.
Defines how much the camera parameters (internals) can be recalculated and adjusted during the project calibration:
- Low (Default): Optimizes all the internal camera parameters for every individual project to take into account project specifics.
- High: Forces the internal parameters to be close to the initial values. We recommend using it when:
- The difference between the initial and optimized camera parameters is higher than 5%.
- The calibrated project is warped or curved.
This process is used to reoptimize already computed internal and external camera parameters. It can be used when changes to GCPs are applied after the Calibrate step is completed.
Such changes can be:
- Adding GCPs marks.
- Changing the position of existing GCPs marks.
- Removing GCPs with marks.