Image sensor having a noise filter, camera having the image sensor, and driving method thereof

摘要

Disclosed are a camera, an image sensor thereof, and a driving method thereof. An image sensor converts an incident light into an electrical image signal. The image sensor outputs the converted electrical image signal by removing noise from the electrical image signal. An image processing unit processes the output image signal to generate screen image data. The image sensor effectively removes noise, thereby improving the optical precision of the camera.

主权项

1. An image sensor comprising:
an image detecting unit for converting an incident light into an electrical image signal, wherein the image detecting unit includes a photodetector array; and a noise filter for removing noise from the electrical image signal, wherein the image sensor is assembled with a lens unit for receiving the incident light and including a diffractive optical element (DOE), wherein the lens unit includes at least one of a first lens group, a second lens group, an aperture, and an optical low pass filter, wherein the noise is caused as the light is diffracted in the diffractive optical element, and wherein the noise filter includes:
a point spread function (PSF) calculating unit for calculating a PSF from the electrical image signal;an inverse Fourier transform unit for calculating an inverse PSF by performing an inverse Fourier transform with respect to the PSF; andan operating unit for removing the noise from the electrical image signal by performing a convolution operation with respect to the electrical image signal and the inverse PSF.