Patent ID: 8233548

Claim:
A noise reduction device for reducing noise of a compression coded video signal, comprising: a two-dimensional noise reducing unit operable to reduce noise by arithmetic processing within an image; a three-dimensional noise reducing unit operable to receive a video signal processed by the two-dimensional noise reducing unit and to reduce noise by arithmetic processing between images; a first noise reduction intensity setting unit operable to set noise reduction intensity of the two-dimensional noise reducing unit; a second noise reduction intensity setting unit operable to set noise reduction intensity of the three-dimensional noise reducing unit, and a video source judging unit operable to judge whether the video signal is film material or not film material, wherein the second noise reduction intensity setting unit sets the noise reduction intensity of the three-dimensional noise reducing unit, so that the noise reduction intensity of the three-dimensional noise reducing unit becomes lower as the noise reduction intensity of the two-dimensional noise reducing unit becomes higher, the three-dimensional noise reducing unit detects motion within the image, and reduces the noise by arithmetic processing between images when an amount of the detected motion is equal to or smaller than a predetermined value, and the second noise reduction intensity setting unit receives a judging result from the video source judging unit, and sets motion detection sensitivity of the three-dimensional noise reducing unit, which is used when the video signal is film material, higher than that used when the video signal is not film material.