Camera Module Section-Based Autofocus ISP Contradiction

The image area is divided into multiple sections (e.g., first, second, third sections) along the imaging depth direction. Each section is independently auto-focused by controlling the lens transfer unit to different positions, allowing separate focusing level detection for each section. This segmentation enables accurate identification of the best-focused image by comparing focusing levels across sections without requiring complex simultaneous processing of the entire image.

The patent performs preliminary auto-focusing on multiple sections by advancing the lens to different predetermined positions before final image selection. The focusing level of each section is detected and compared in advance, allowing the system to pre-identify which section provides the best focus. This preliminary action eliminates the need for complex real-time processing during image capture, reducing overall processing complexity.

The imaging depth range is segmented into multiple discrete sections, each photographed at a different lens position. By dividing the continuous depth of field into separate sections and photographing each independently, the patent avoids the overlapping focus issues that occur when attempting to capture the entire depth range in a single image. Each section achieves optimal sharpness at its specific focal plane without interference from other depth regions.

The patent addresses the depth of field problem by introducing a temporal dimension - photographing different sections at different times with the lens positioned at different locations. Instead of attempting to capture the entire depth range simultaneously (which causes focus overlap), the system sequentially captures each section, allowing precise focus control for each without the constraints of a single exposure's depth of field.

The system performs preliminary focusing level detection on multiple sections by rapidly transferring the lens to predetermined positions before final image capture. This preliminary action allows the system to pre-identify the best-focused section and its optimal lens position, eliminating the need for slow, iterative focus adjustment during actual image capture. The preliminary detection phase uses simplified metrics to quickly narrow down the best focus point.

The patent employs periodic lens transfer between predetermined positions corresponding to different image sections. Rather than continuous or iterative focusing adjustments, the lens is periodically moved to specific positions where focusing level detection is performed. This periodic sampling approach balances focus detection accuracy with speed by visiting only the critical focal planes that contain potential best-focus information.