首页>
外国专利>
Apparatus and method for improving dynamic range and linearity of CMOS image sensor
Apparatus and method for improving dynamic range and linearity of CMOS image sensor
展开▼
机译:用于提高CMOS图像传感器的动态范围和线性度的装置和方法
展开▼
页面导航
摘要
著录项
相似文献
摘要
Described herein is a circuit and related method for improving the dynamic range and the linearity characteristic of a CMOS image sensor. In various embodiments of the CMOS image sensor, a current sampler, a comparator, and a 1-bit memory are incorporated in each pixel circuit. In the image sensor, pixels are arranged in columns and a column slice is used to read the digital and analog singles from each column. In addition, a calibration circuit is incorporated in the sensor circuit for providing calibration current, which is used to generate calibration parameter. The image sensor operates in three non-overlapping modes: the difference mode, the WDR mode, and the calibration mode. The image sensor is switched among the three modes by control signals, which are provided to the image sensor by various control circuits. The image sensor normally operates in the difference mode and switches to the WDR mode when the difference between consecutive frames is over a threshold. The calibration mode allows the image sensor generate calibration parameters which are used to improve the linearity of the sensor through a interpolation method.
展开▼