Canon secured a patent (EP20120151498) for an auto-focusing algorithm (and unit) to speed up auto-focusing operations of a digital DSLR while tracking moving objects (at least this is what I understood by reading the patent). Is this the next generation of Canon’s AF systems?
A focus control method is provided that performs focus control by sensing a plurality of images of an object while moving a position of a focusing lens and determining in-focus positions in auto focusing areas located at a plurality of positions. The focus control method calculates an in-focus position of the focusing lens based on the focusing lens position at the time of reading an image signal of each of the auto focusing areas and a degree of focused state of each of the auto focusing area that is based on the image signal of each of the auto focusing areas.
The patent aims at resolving issues caused by the rolling shutter method used to control an electronic shutter. This works as follows: