Noise detection method, noise reduction method, noise detection device, and noise reduction device
AssigneeCanon Kabushiki Kaisha
InventorSeiji Matsunaga
Life of this patent
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Abstract
In detection of noise by comparing a digital input image signal and an output image signal in one previous frame with each other, when the input image signal, the output image signal in one previous frame, and a predetermined reference value are represented by a, b, and x, respectively, and when |a−b|≦x and a−b≠1 are satisfied, the presence of noise is determined.
Claims12
A noise detection method for comparing a digital input image signal with an output image signal in one previous frame to detect noise, comprising
- inputting a digital image signal of sequential frames into a noise detecting process unit for comparing pixel data, and
- outputting a digital image signal of sequential frames from the noise detecting process unit for comparing pixel data, wherein
- when pixel data of the input image signal, pixel data of the output image signal in one previous frame, and a predetermined reference value are represented by a, b, and x, respectively, and when |a−b|≦x and a−b≠1 are satisfied, the presence of noise is determined.
A noise detection method for comparing a digital input image signal with an output image signal in one previous frame to detect noise, comprising
- inputting a digital image signal of sequential frames into a noise detecting process unit for comparing pixel data, and
- outputting a digital image signal of sequential frames from the noise detecting process unit for comparing pixel data, wherein
- when pixel data of the input image signal, pixel data of the output image signal in one previous frame, and a predetermined reference value are represented by a, b, and x, respectively, and when |a−b|≦x and 1<|a−b| are satisfied, the presence of noise is determined.
A noise detection device far comparing a digital input image signal with an output image signal in one previous frame to detect noise, comprising
- a noise detecting process unit for inputting a digital image signal of sequential frames for comparing pixel data and for outputting the digital image signal of sequential frames, wherein
- when pixel data of the input image signal, pixel data of the output image signal in one previous frame, and a predetermined reference value are represented by a, b, and x, respectively, and when |a−b|≦x and a−b≠1 are satisfied, the presence of noise is determined.
A noise detection device for comparing an input image signal with an output image signal in one previous frame to detect noise, comprising
- a noise detecting process unit for inputting a digital image signal of sequential frames for comparing pixel data and for outputting the digital image signal of sequential frames, wherein
- when pixel data of the input image signal, pixel data of the output image signal in one previous frame, and a predetermined reference value are represented by a, b, and x, respectively, and when |a−b|≦x and 1<|a−b| are satisfied, the presence of noise is determined.
Dependencies are inferred from the claim text.