Provided is a photoelectric sensor, a random accessible active pixel circuit, an image sensor and a camera. A photoelectric sensor comprises a doped region, a substrate, a doped source region, a doped drain region, and two isolation regions; wherein the doped region is arranged on a bottom surface of the substrate so as to form a photodiode; a cathode of the photodiode is formed in the doped region and is connected to a positive voltage to make the photodiode work in a reverse bias region; wherein the doped source region and the doped drain region are spaced apart on top of the substrate so as to form a field effect transistor; a source is formed on a top surface of the doped source region, and a drain is formed on the top surface of the doped drain region; wherein the two isolation regions are arranged on opposite sides of the substrate, and extend from the doped source region and the doped drain region to the doped region; wherein a gate dielectric layer and a gate between the doped source region and the doped drain region are configured sequentially upwards from the top surface of the substrate; the gate is connected to a voltage to make the field effect transistor select wide dynamic range mode or high gain mode.

An image sensor includes a pixel configured to output a pixel signal through a column line, a ramp signal generator configured to generate a reference ramp signal having a level which decreases based on a desired slope, a first gain circuit configured to receive the reference ramp signal, and generate a first ramp signal based on the reference ramp signal, the first ramp signal having a different slope than the reference ramp signal, a second gain circuit configured to receive the reference ramp signal, and generate a second ramp signal based on the reference ramp signal, the second ramp signal having a different slope than the first ramp signal, a first comparator configured to generate a first comparison signal based on the first ramp signal and the pixel signal, and a second comparator configured to generate a second comparison signal based on the second ramp signal and the pixel signal.

An image sensor includes a pixel configured to output a pixel signal through a column line, a ramp signal generator configured to generate a reference ramp signal having a level which decreases based on a desired slope, a first gain circuit configured to receive the reference ramp signal, and generate a first ramp signal based on the reference ramp signal, the first ramp signal having a different slope than the reference ramp signal, a second gain circuit configured to receive the reference ramp signal, and generate a second ramp signal based on the reference ramp signal, the second ramp signal having a different slope than the first ramp signal, a first comparator configured to generate a first comparison signal based on the first ramp signal and the pixel signal, and a second comparator configured to generate a second comparison signal based on the second ramp signal and the pixel signal.

An image processing apparatus that corrects image data captured with an image sensor capable of setting for each of regions at least one exposure condition including at least one of a gain value per pixel and an exposure time includes an acquisition unit configured to acquire a dark current component in a light shielding region of the image sensor for each of the at least one exposure condition changed at predetermined intervals, and a correction unit configured to correct the image data using the dark current component acquired by the acquisition unit.

According to embodiments of the present disclosure, an image processing apparatus for processing image data captured by an image sensor configured to set exposure area by area includes a calculation unit configured to calculate an exposure value of each of the areas, and a correction unit configured to, in a case where the exposure value of each of the areas does not fall within a range based on a reference exposure value, correct the exposure value of each of the areas so that the exposure value approaches an upper limit or lower limit of the range.

According to embodiments of the present disclosure, an image processing apparatus for processing image data captured by an image sensor configured to set exposure area by area includes a calculation unit configured to calculate an exposure value of each of the areas, and a correction unit configured to, in a case where the exposure value of each of the areas does not fall within a range based on a reference exposure value, correct the exposure value of each of the areas so that the exposure value approaches an upper limit or lower limit of the range.

Systems, methods, and computer-readable media are provided for performing post automatic exposure control (AEC) and automatic white balance (AWB) processing to improve video quality. In some examples, a computing device can obtain one or more statistics associated with one or more past image frames and one or more future image frames, the one or more past image frames being captured prior to a current image frame and the one or more future image frames being captured subsequent to the current image frame. The computing device can adjust, based on the one or more statistics, at least one of a brightness or a color of the current image frame to generate an adjusted image frame. The computing device can further output the adjusted image frame.

Systems, methods, and computer-readable media are provided for performing post automatic exposure control (AEC) and automatic white balance (AWB) processing to improve video quality. In some examples, a computing device can obtain one or more statistics associated with one or more past image frames and one or more future image frames, the one or more past image frames being captured prior to a current image frame and the one or more future image frames being captured subsequent to the current image frame. The computing device can adjust, based on the one or more statistics, at least one of a brightness or a color of the current image frame to generate an adjusted image frame. The computing device can further output the adjusted image frame.

A lens shading correction circuit includes an elliptical gain generation circuit configured to extract a position of a pixel and generate an elliptical gain value using elliptical gain parameters and the extracted position and a multiplier configured to output an output value by multiplying the elliptical gain value by a weight for the pixel. The lens shading correction circuit corrects the lens shading based on the first output value and a gain increment value.

A lens shading correction circuit includes an elliptical gain generation circuit configured to extract a position of a pixel and generate an elliptical gain value using elliptical gain parameters and the extracted position and a multiplier configured to output an output value by multiplying the elliptical gain value by a weight for the pixel. The lens shading correction circuit corrects the lens shading based on the first output value and a gain increment value.