Image sensor structure and method for achieving high-dynamic-range image

Abstract

The invention provides an image sensor structure for achieving a high-dynamic range and a camera formed by the sensor and a lens. The image sensor structure for achieving the high-dynamic range is composed of a pixel photosensitive unit, a control module and a peripheral circuit. The control module is in circulation connection with the pixel photosensitive unit, and thus the pixel photosensitive unit is changeable in conversion gain. The invention further provides a method for achieving a high-dynamic-range image and a video. The method comprises the steps that the pixel photosensitive unit converts external light intensity into voltage signals through certain conversion gain, outputs and forms the image and conveys the image to the control module, the control module converts the input into digital signals to conduct recognition and judgment, feeds back a result to the pixel photosensitive unit, and dynamically controls and adjusts the gain conversion of the pixel photosensitive unit; continuous adjustment is conducted according to certain frame frequency to form the video. According to the image sensor structure, the camera and the method for achieving the high-dynamic-range image and the video, under the premise that the pixel resolution ratio is not changed and multiple images do not need to be shot, the dynamic range of shooting the image can be greatly enlarged, video shooting can be easily achieved, and the practicability of the image sensor is greatly improved.

Description

technical field [0001] The invention relates to the field of image sensors, in particular to an image sensor structure and method for realizing high dynamic range images. Background technique [0002] The image sensor is an important part of the camera. The image sensor in traditional cameras is realized by film, while in modern digital cameras, the image sensor is realized by CMOS or CCD image sensor. Similarly, CMOS or CCD image sensor is also used in digital cameras to capture video. [0003] The pixel unit of a conventional CMOS image sensor is the core device of the image sensor to realize light sensing. It usually includes: a photosensitive unit photodiode for photoelectric conversion and a series of peripheral circuits for transmission, signal conversion, amplification and control. [0004] For a pixel unit, if the area of ​​the pixel unit is larger, it corresponds to better sensitivity and dynamic range. In the current application fields of high-end CMOS image sens...

AI Technical Summary

Problems solved by technology

The advantage of this is that it can better reflect the visual effect of people in the real environment, but the disadvantage is that multiple (usually 3) photos need to be taken to synthesize a high dynamic range image

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