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US 7,626,639 B2Granted
Method and apparatus for detecting noise in moving picture
AssigneeKabushiki Kaisha Toshiba
InventorHimio Yamauchi
Life of this patent
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Abstract
An image processing apparatus includes a difference generation section and a histogram generation section. The difference generation section generates picture differences between frames of a moving picture in units of pixels, based on a present signal of the moving picture and a noise-eliminated frame-delayed signal acquired by subjecting the present signal to a process of eliminating noise and a process of delaying the present signal by one frame. The histogram generation section generates a histogram indicating a level distribution of part of the generated picture differences from which picture differences corresponding to pixels where a picture change not less than a threshold occurs are excluded.
Claims10
An image processing apparatus, comprising:
- a difference generation section which generates picture differences between frames of a moving picture in units of pixels, based on a present signal of the moving picture and a noise-eliminated frame-delayed signal acquired by subjecting the present signal to a process of eliminating noise and a process of delaying the present signal by one frame;
- a histogram generation section which generates a histogram indicating a level distribution of part of the generated picture differences from which picture differences corresponding to pixels where a picture change not less than a threshold occurs are excluded;
- a motion detection section which detects pixels where a signal-level change between the frames is not less than a certain value;
- and
- a control section which controls to exclude picture differences corresponding to pixels detected by the motion detection section, from the picture differences generated by the difference generation section.
2 more elements
An image processing apparatus, comprising:
- a difference generation section which generates picture differences between frames of a moving picture in units of pixels, based on a present signal of the moving picture and a noise-eliminated frame-delayed signal acquired by subjecting the present signal to a process of eliminating noise and a process of delaying the present signal by one frame;
- a histogram generation section which generates a histogram indicating a level distribution of part of the generated picture differences from which picture differences corresponding to pixels where a picture change not less than a threshold occurs are excluded;
- an edge detection section which detects pixels which have a signal-level difference not less than a certain value with respect to adjacent pixels;
- and
- a control section which controls to exclude picture differences corresponding to pixels detected by the edge detection section, from the picture differences generated by the difference generation section.
2 more elements
An image processing apparatus, comprising:
- a difference generation section which generates picture differences between frames of a moving picture in units of pixels, based on a present signal of the moving picture and a noise-eliminated frame-delayed signal acquired by subjecting the present signal to a process of eliminating noise and a process of delaying the present signal by one frame;
- a histogram generation section which generates a histogram indicating a level distribution of part of the generated picture differences from which picture differences corresponding to pixels where a picture change not less than a threshold occurs are excluded;
- and
- a noise-amount determination section which determines an amount of noise based on the histogram generated by the histogram generation section.
1 more element
An image processing method, comprising:
- generating picture differences between frames of a moving picture in units of pixels, based on a present signal of the moving picture and a noise-eliminated frame-delayed signal acquired by subjecting the present signal to a process of eliminating noise and a process of delaying the present signal by one frame;
- generating a histogram indicating a level distribution of part of the generated picture differences from which picture differences corresponding to pixels where a picture change not less than a threshold occurs are excluded;
- detecting pixels where a signal-level change between the frames is not less than a certain value;
- and
- excluding picture differences corresponding to the detected pixels, from the picture differences generated by the picture differences generating.
2 more elements
An image processing method, comprising:
- generating picture differences between frames of a moving picture in units of pixels, based on a present signal of the moving picture and a noise-eliminated frame-delayed signal acquired by subjecting the present signal to a process of eliminating noise and a process of delaying the present signal by one frame;
- generating a histogram indicating a level distribution of part of the generated picture differences from which picture differences corresponding to pixels where a picture change not less than a threshold occurs are excluded;
- detecting pixels which have a signal-level difference not less than a certain value with respect to adjacent pixels;
- and
- excluding picture differences corresponding to the detected pixels, from the picture differences generated by the picture differences generating.
2 more elements
An image processing method, comprising:
- generating picture differences between frames of a moving picture in units of pixels, based on a present signal of the moving picture and a noise-eliminated frame-delayed signal acquired by subjecting the present signal to a process of eliminating noise and a process of delaying the present signal by one frame;
- generating a histogram indicating a level distribution of part of the generated picture differences from which picture differences corresponding to pixels where a picture change not less than a threshold occurs are excluded;
- and
- determining an amount of noise based on the generated histogram.
1 more element
Dependencies are inferred from the claim text.