Abstract: An imaging device includes a fixed focus lens, an image sensor having an image matrix of a plurality of pixels arranged on a semiconductor substrate and supplying image data, and an electronic circuit for reading the image matrix. The image sensor also includes at least two ambient light sensors arranged on the semiconductor substrate on opposite sides of the image matrix, and configured to capture an ambient light intensity through the fixed lens, and the electronic circuit is also configured to read the two ambient light sensors and to supply ambient light data and the image data.

Abstract: A method of analog to digital voltage conversion including: generating a quadratic signal based on an analog time varying reference signal; generating a ramp signal based on the quadratic signal; and converting an analog input voltage to a digital output value based on a time duration determined by a comparison of the analog input voltage with the ramp signal.

Abstract: An imaging device includes a fixed focused lens, an image sensor having a image matrix of a plurality of pixels arranged on a semiconductor substrate and supplying image data, and electronic means for reading the image matrix. The image sensor also comprises at least two ambient light sensors arranged on the semiconductor substrate on opposite sides of the image matrix, and configured to capture an ambient light intensity through the fixed lens, and the electronic means is also configured to read the two ambient light sensors and to supply ambient light data and the image data.

Abstract: A method of analog to digital voltage conversion including: generating a quadratic signal based on an analog time varying reference signal; generating a ramp signal based on the quadratic signal; and converting an analog input voltage to a digital output value based on a time duration determined by a comparison of the analog input voltage with the ramp signal.

Abstract: An image sensor captures an image of a scene. This captured image has a pincushion distortion relative to an undistorted image of the scene. The distortion is corrected based on an approximation of the distortion D which satisfies the following equation for a given pixel in the captured image: D=(R?R?)/R=Da*(y2?x2+yoffset)+Db*R4, where R is the distance between a pixel, which corresponds in the undistorted image to the given pixel in the captured image, and the center of the undistorted image, R? is the distance between the given pixel and the center of the captured image, Da and Db are respective distortion parameters of the image sensor, x and y are coordinates of the given pixel in the captured image, R satisfies the following equation: R2=x2+y2 and yoffset corresponds to a constant value.

Abstract: An image sensor captures an image of a scene. This captured image has a pincushion distortion relative to an undistorted image of the scene. The distortion is corrected based on an approximation of the distortion D which satisfies the following equation for a given pixel in the captured image: D=(R?R?)/R=Da*(y2?x2+yoffset)+Db*R4, where R is the distance between a pixel, which corresponds in the undistorted image to the given pixel in the captured image, and the center of the undistorted image, R? is the distance between the given pixel and the center of the captured image, Da and Db are respective distortion parameters of the image sensor, x and y are coordinates of the given pixel in the captured image, R satisfies the following equation: R2=x2+y2 and yoffset corresponds to a constant value.