database.rst

Database

Database are generated by the rendering module, and contains all images and there corresponding position-orientations.

• position_orientation: containing all position and orientation of where images were rendered. The position-orientation is described by ['x','y','z','alpha_0','alpha_1','alpha_2']
• image: containing all images ever rendered. Each channel of each image are normalised, so to use the full coding range.
• normalisation: the normalisation constantes

How to load a database

How to load all position-orientation

The database contains all position-orientation at which an image as been rendered. In certain situation, it may be usefull to know all position-orientation in the database. More technically speaking, loading the full table of position-orientaiton.

How to load an image

The database contains images which can be processed differently depending on the navigation strategy beeing used.

Images are at given position-orientations. To load an image the position-orientation can be given. The DataBaseLoader will look if this position-orientation has been rendered. If it is the case, the image will be returned.

However, looking in the database if an image has already been rendered at a given position-orientation can cost time. To speed up certain calculation, image can instead be access by row number. Indeed each position-orientation can be identified by a unique row number. This number is consistant through the entire database. Thus, an image can be loaded by providing the row number.