US6008866A
Expired / Lapsed
US
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Video signal edge detection circuit and motion processing circuit
Assignee: Renesas Electronics Corp
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Filing: 1997-09-30
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Granted: 1999-12-28
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Expires: 2017-09-30
Abstract
Abstract The invention provides an edge detection circuit and a motion processing circuit which can prevent, upon motion detection between frames, erroneous detection at an edge portion, particularly a moving edge portion. A first edge detection section detects an edge of a pattern of an image provided by a first one of frames of a video signal and forwards a first edge detection signal. A second edge detection section detects the edge of the pattern of an image provided by a second one of the frames of the video signal at a time different from that of the first frame and forwards a second edge detection signal. An edge motion discrimination section receives the first and second edge detection signals and discriminates presence of absence of motion of the edge between the first and second frames based on the first and second edge detection signals. Consequently, any edge portion which exhibits motion between frames can be detected correctly.
Inventors
- 👤 Yoshikazu Komatsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 19:59
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/14; H04N5/20; H04N5/205; H04N5/208; H04N5/144
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
150 words
An edge detection circuit which receives a video signal which can be divided into a series of frames and detects an edge portion of a pattern of an image provided by the video signal, comprising: first edge detection means for detecting an edge of a pattern of an image provided by a first one of the frames of the video signal and forwarding a first edge detection signal; second edge detection means for detecting the edge of the pattern of an image provided by a second one of the frames of the video signal at a time different from that of the first frame and forwarding a second edge detection signal; and edge motion discrimination means for receiving the first and second edge detection signals and discriminating presence of absence of motion of the edge between the first and second frames based on the first and second edge detection signals.
Claim 2
Dependent Claim
150 words
An edge detection circuit which receives a video signal which can be divided into a series of frames and detects an edge portion of a pattern of an image provided by the video signal, comprising: first edge detection means for detecting an edge of a pattern of an image provided by a first one of the frames of the video signal and forwarding a first edge detection signal; second edge detection means for detecting the edge of the pattern of an image provided by a second one of the frames of the video signal at a time different from that of the first frame and forwarding a second edge detection signal; and edge motion discrimination means for receiving the first and second edge detection signals and discriminating presence of absence of motion of the edge between the first and second frames based on the first and second edge detection signals.
Claim 3
Dependent Claim
20 words
An edge detection circuit as claimed in claim 1, wherein the second frame precedes in time to the first frame.
Claim 4
Dependent Claim
19 words
An edge detection circuit as claimed in claim 2, wherein the second frame directly precedes to the first frame.
Claim 5
Dependent Claim
29 words
An edge detection circuit as claimed in claim 1, wherein said edge motion discrimination means is an AND circuit for logically ANDing the first and second edge detection signals.
Claim 6
Dependent Claim
130 words
An edge detection circuit which receives a video signal which can be divided into a series of frames and detects an edge portion of a pattern of an image provided by the video signal, comprising: edge detection means for detecting an edge of a pattern of an image provided by one of the frames of the video signal and forwarding a first edge detection signal; delay means for delaying the first edge detection signal by one frame and outputting the delayed first edge detection signal as a second edge detection signal; and edge motion discrimination means for receiving the first and second edge detection signals and discriminating presence of absence of motion of the edge between the first and second frames based on the first and second edge detection signals.
Claim 7
Dependent Claim
130 words
An edge detection circuit which receives a video signal which can be divided into a series of frames and detects an edge portion of a pattern of an image provided by the video signal, comprising: edge detection means for detecting an edge of a pattern of an image provided by one of the frames of the video signal and forwarding a first edge detection signal; delay means for delaying the first edge detection signal by one frame and outputting the delayed first edge detection signal as a second edge detection signal; and edge motion discrimination means for receiving the first and second edge detection signals and discriminating presence of absence of motion of the edge between the first and second frames based on the first and second edge detection signals.
Claim 8
Dependent Claim
17 words
An edge detection circuit as claimed in claim 5, wherein said delay means is a frame memory.
Claim 9
Dependent Claim
29 words
An edge detection circuit as claimed in claim 5, wherein said edge motion discrimination means is an AND circuit for logically ANDing the first and second edge detection signals.
Claim 10
Dependent Claim
173 words
A motion processing circuit which receives a video signal which can be divided into a series of frames, detects motion of an image provided by the video signal and produces a motion signal, comprising: first edge detection means for detecting an edge of a pattern of an image provided by a first one of the frames of the video signal and forwarding a first edge detection signal; second edge detection means for detecting the edge of the pattern of an image provided by a second one of the frames of the video signal at a time different from that of the first frame and forwarding a second edge detection signal; edge motion discrimination means for receiving the first and second edge detection signals and discriminating presence of absence of motion of the edge between the first and second frames based on the first and second edge detection signals; and adaptive processing means for controlling outputting of the motion signal in accordance with a result of the discrimination of said edge motion discrimination means.
Claim 11
Dependent Claim
173 words
A motion processing circuit which receives a video signal which can be divided into a series of frames, detects motion of an image provided by the video signal and produces a motion signal, comprising: first edge detection means for detecting an edge of a pattern of an image provided by a first one of the frames of the video signal and forwarding a first edge detection signal; second edge detection means for detecting the edge of the pattern of an image provided by a second one of the frames of the video signal at a time different from that of the first frame and forwarding a second edge detection signal; edge motion discrimination means for receiving the first and second edge detection signals and discriminating presence of absence of motion of the edge between the first and second frames based on the first and second edge detection signals; and adaptive processing means for controlling outputting of the motion signal in accordance with a result of the discrimination of said edge motion discrimination means.
Claim 12
Dependent Claim
20 words
A motion processing circuit as claimed in claim 8, wherein the second frame precedes in time to the first frame.
Claim 13
Dependent Claim
19 words
A motion processing circuit as claimed in claim 9, wherein the second frame directly precedes to the first frame.
Claim 14
Dependent Claim
29 words
A motion processing circuit as claimed in claim 8, wherein said edge motion discrimination means is an AND circuit for logically ANDing the first and second edge detection signals.
Claim 15
Dependent Claim
153 words
A motion processing circuit which receives a video signal which can be divided into a series of frames, detects motion of an image provided by the video signal and produces a motion signal, comprising: edge detection means for detecting an edge of a pattern of an image provided by one of the frames of the video signal and forwarding a first edge detection signal; delay means for delaying the first edge detection signal by one frame and outputting the delayed first edge detection signal as a second edge detection signal; edge motion discrimination means for receiving the first and second edge detection signals and discriminating presence of absence of motion of the edge between the first and second frames based on the first and second edge detection signals; and adaptive processing means for controlling outputting of the motion signal in accordance with a result of the discrimination of said edge motion discrimination means.
Claim 16
Dependent Claim
153 words
A motion processing circuit which receives a video signal which can be divided into a series of frames, detects motion of an image provided by the video signal and produces a motion signal, comprising: edge detection means for detecting an edge of a pattern of an image provided by one of the frames of the video signal and forwarding a first edge detection signal; delay means for delaying the first edge detection signal by one frame and outputting the delayed first edge detection signal as a second edge detection signal; edge motion discrimination means for receiving the first and second edge detection signals and discriminating presence of absence of motion of the edge between the first and second frames based on the first and second edge detection signals; and adaptive processing means for controlling outputting of the motion signal in accordance with a result of the discrimination of said edge motion discrimination means.
Claim 17
Dependent Claim
17 words
A motion processing circuit as claimed in claim 12, wherein said delay means is a frame memory.
Claim 18
Dependent Claim
29 words
A motion processing circuit as claimed in claim 12, wherein said edge motion discrimination means is an AND circuit for logically ANDing the first and second edge detection signals.
Claim 19
Dependent Claim
140 words
A motion processing circuit, comprising: (a) a first frame memory that receives an input frame signal and outputs a first preceding frame signal corresponding to a previous value of the input frame signal; (b) a motion detection section that outputs a motion signal that varies according to differences between the input frame signal and the first preceding frame signal; (c) a first edge detection section that detects a first edge in the input frame signal; (d) a second edge detection section that detects a second edge in the first preceding frame signal; (e) an edge motion discrimination section that asserts an adaptation edge signal in response to the edge detection sections detecting the first and second edges; and (f) an adaptive processing section that outputs the motion signal and that attenuates the motion signal according to the adaptive edge signal.
Claim 20
Dependent Claim
140 words
A motion processing circuit, comprising: (a) a first frame memory that receives an input frame signal and outputs a first preceding frame signal corresponding to a previous value of the input frame signal; (b) a motion detection section that outputs a motion signal that varies according to differences between the input frame signal and the first preceding frame signal; (c) a first edge detection section that detects a first edge in the input frame signal; (d) a second edge detection section that detects a second edge in the first preceding frame signal; (e) an edge motion discrimination section that asserts an adaptation edge signal in response to the edge detection sections detecting the first and second edges; and (f) an adaptive processing section that outputs the motion signal and that attenuates the motion signal according to the adaptive edge signal.
Claim 21
Dependent Claim
20 words
A motion processing circuit, according to claim 15, wherein the second edge detection section is coupled to the frame memory.
Claim 22
Dependent Claim
22 words
A motion processing circuit, according to claim 15, wherein the second edge detection section is coupled to the first edge detection section.
Claim 23
Dependent Claim
35 words
A motion processing circuit, according to claim 15, wherein the previous value of the frame signal contained in the frame memory corresponds to a frame immediately preceding a frame corresponding to the input frame signal.
Claim 24
Dependent Claim
117 words
A motion processing circuit, according to claim 15, further comprising: (g) a second frame memory, coupled to the first preceding frame signal, the second frame memory outputting a second preceding frame signal corresponding to a previous value of the first preceding frame signal; and (h) a third edge detection section that detects a third edge in the second preceding frame signal, wherein the edge motion discrimination section asserts the adaptation edge signal in response to the edge detection section detecting the first, second, and third edges and wherein the motion detection section outputs a motion signal that varies according to differences between the input frame signal, the first preceding frame signal, and the second preceding frame signal.
Claim 25
Dependent Claim
41 words
A motion processing circuit, according to claim 15, wherein the first and second edge detection sections output numeric values corresponding to values of the first and second edges and wherein attenuation of the motion signal varies according to the numeric values.
Claim 26
Independent Claim
78 words
A method of detecting motion in a video signal, comprising: (a) sensing a difference between a first frame and a second frame of the video signal; (b) detecting a first edge in the first frame; (c) detecting a second edge in the second frame; and (d) providing an output signal that varies according to the difference between the first and second frames, wherein the output signal is attenuated in response to the first and second edges being detected.
Claim 27
Independent Claim
78 words
A method of detecting motion in a video signal, comprising: (a) sensing a difference between a first frame and a second frame of the video signal; (b) detecting a first edge in the first frame; (c) detecting a second edge in the second frame; and (d) providing an output signal that varies according to the difference between the first and second frames, wherein the output signal is attenuated in response to the first and second edges being detected.
Claim 28
Dependent Claim
27 words
A method of detecting motion in a video signal, according to claim 21, wherein detecting the second edge including using a previous value of the first edge.
Claim 29
Dependent Claim
41 words
A method of detecting motion in a video signal, according to claim 21, wherein sensing the difference between the first and second frames includes storing the second frame in a frame memory and comparing components of the first and second frames.
Claim 30
Dependent Claim
68 words
A method of detecting motion in a video signal, according to claim 21, further comprising: (e) sensing an other difference between a third frame and the first and second frames; and (f) detecting a third edge in the third frame, wherein the output signal varies according to the other difference and wherein the output signal is attenuated in response to the first, second, and third edges being detected.
Claim 31
Dependent Claim
44 words
A method of detecting motion in a video signal, according to claim 21, wherein detecting the first and second edges includes providing numeric values corresponding to an absolute value of the edges and wherein attenuation of the output varies according to the numeric values.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-12-27 | 2003-06-28 | 2003-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-12-27 | 2007-06-28 | 2007-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-12-27 | 2011-06-28 | 2011-12-28 | $7700.00 | Window Closed / Lapsed |