Image system and denoising method thereof

摘要

There is provided a denoising method of an image system that detects a brightness variation cycle of ambient light sources, records a brightness variation of at least one noise area within the brightness variation cycle and compensates the brightness variation from current images thereby removing interference from the ambient light sources. There is further provided an image system.

主权项

1. An image system, comprising:
at least one image sensor configured to continuously acquire images; and a processing unit configured to determine at least one noise area according to the images acquired by the image sensor, and record a brightness variation parameter and a phase parameter of the noise area within a reference brightness variation cycle to accordingly compensate a brightness of the noise area in current images, wherein the brightness variation parameter is one selected from the group consisting of
(i) a brightness value of the noise area in each of the images acquired by the image sensor within the reference brightness variation cycle,(ii)a brightness difference of the brightness value of the noise area with respect to an average brightness value in each of the images acquired by the image sensor within the reference brightness variation cycle; and(iii) a brightness ratio of the brightness value of the noise area with respect to the average brightness value in each of the images acquired by the image sensor within the reference brightness variation cycle; and the phase parameter is a sampling phase of each of the images acquired by the image sensor within the reference brightness variation cycle.