Method for removing image noise and night-vision system using the same

PURPOSE: A noise eliminating method and a night vision system using the same are provided to make a coefficient value of a low pass filter different according to a feature of an image to eliminate noise. CONSTITUTION: A brightness increasing unit(120) increase a brightness value of an image. A noise component of the image is eliminated by a first noise eliminating unit. A second noise eliminating unit(130) filters a component which functions as noise from the image. The second noise eliminating unit eliminates the component. A signal processing unit(140) processes an image signal. The signal processing unit outputs the processed image signal on a display.