Image Sensor Electronic Zoom Readout Mode Switching

The patent divides the image readout process into two distinct modes: a first readout mode for still images that reads all pixels to achieve high resolution, and a second readout mode for moving images that reads only a subset of pixels (thinning) to reduce readout time. This segmentation allows the system to optimize for either resolution or speed depending on the application.

For moving image capture, the patent applies partial action by reading only a portion of the available pixels rather than all pixels. By thinning the pixel data (reading every nth pixel) or selectively reading specific regions, the system achieves acceptable moving image quality while significantly reducing readout time and power consumption.

The patent implements preliminary action by performing pixel thinning and averaging operations during the image readout process itself, rather than as a separate post-processing step. The image processing unit simultaneously reads pixels from the sensing element and performs thinning/averaging calculations, completing both operations in one pass through the data.

The patent merges the pixel reading operation with the pixel thinning and averaging operations into a single integrated process. The image processing unit combines multiple pixel readings with immediate processing, eliminating the need for separate readout and processing passes.

The patent applies partial action during electronic zoom by selectively reading only the pixels within the active zoom region rather than reading all pixels at the maximum drive frequency. This reduces the number of pixel reads required while maintaining the refresh rate for the displayed zoomed portion.

The patent implements dynamic adjustment of the readout strategy based on the zoom level. At higher zoom levels, the system dynamically switches to reading fewer pixels at reduced intervals, adapting the readout rate to match the actual display requirements and reducing power consumption accordingly.