Dynamic pixel-wise multi-gain readout for high dynamic range imaging

Abstract

Systems and methods are disclosed to enable fast readout from an image sensor to support pixel-wise conversion gain selection for high dynamic range imaging. In embodiments, an image sensor integrated circuit performs the pixel-wise gain selection with its readout circuitry, so that the image sensor outputs pixels with only the selected gain option. In this manner, the image sensor is able to achieve faster frame rates and lower power consumption. Depending on the embodiment, the conversion gain may be selected by the readout logic, an image signal processor, or an auto-exposure engine. The gain selection may be made based on a previous image captured by the camera or other pixels in the same image. The image signal processor may interpolate a high-gain and a low-gain portion of the image to obtain full resolution images in the two gain options, and merge the two to obtain the final image.