EP0615245A2
Expired / Lapsed
EP
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Method for detecting a scene change and image editing apparatus
Assignee: NEC Corp
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Filing: 1994-03-07
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Granted: —
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Expires: 2014-03-07
Abstract
Abstract A scene change detector operates on an image signal which has been converted to a spatial-frequency distribution by an orthogonal transformation circuit such as a discrete cosine transformation circuit (18). A DC coefficient extracting section (27) extracts the DC component of the spatial-frequency distribution for each of a plurality of blocks in the image. These values are stored for successive frames in two stores (29,30) and the differences between them calculated by a circuit (31). The absolute values of the differences are taken (32) and a discriminating circuit (33) determines whether the differences exceed a threshold. A scene change is indicated if the threshold is exceeded for more than a predetermined number of blocks in the frame. <IMAGE>
Inventors
- 👤 Hiroyuki Ishikawa
- 👤 Hidehiro Matsumoto
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 05:17
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/14; H04N5/147; G; G06; G06T; G06T7/00; G06T7/20; G06T7/223; G11; G11B; G11B27/00; G11B27/02; G11B27/031; G11B27/10; G11B27/19; G11B27/28; H04N19/00; H04N19/10; H04N19/134; H04N19/142; H04N19/169; H04N19/179; H04N19/85; H04N19/87; H04N5/144; G06T2207/00; G06T2207/10; G06T2207/10016
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
63 words
A method for detecting a scene change, comprising steps of detecting a direct current component value of a spatial frequency distribution for each of a plurality of blocks into which an input image is divided, and detecting a scene change in the input image in accordance with the amount of variation of the direct current component value between frames of the input image.
Claim 2
Dependent Claim
22 words
The method for detecting a scene change as claimed in Claim 1, wherein the spatial frequency distribution is found by orthogonal transformation.
Claim 3
Dependent Claim
20 words
The method for detecting a scene change as claimed in Claim 2, wherein the orthogonal transformation is discrete cosine transformation.
Claim 4
Independent Claim
129 words
A method for detecting a scene change of an input image composed of a plurality of frames, comprising steps of: finding a direct current component value by orthogonal transformation for each of a plurality of blocks into which each of the frames is divided; calculating an absolute value of a difference between the direct current component value of a current frame and the direct current component value of a frame adjacent to the current frame for each of the blocks of the current frame; and counting the number of blocks for which the absolute value exceeds a first threshold value and discriminating, when the number of the blocks is higher than a second threshold value, that there is a scene change between the current frame and the adjacent frame.
Claim 5
Dependent Claim
23 words
The method for detecting a scene change as claimed in Claim 4, wherein the plurality of frames are inputted in a time series.
Claim 6
Dependent Claim
26 words
The method for detecting a scene change as claimed in Claim 5, wherein the adjacent frame is a frame that precedes or succeeds the current frame.
Claim 7
Dependent Claim
20 words
The method for detecting a scene change as claimed in Claim 4, wherein the orthogonal transformation is discrete cosine transformation.
Claim 8
Dependent Claim
20 words
The method for detecting a scene change as claimed in Claim 6, wherein the orthogonal transformation is discrete cosine transformation.
Claim 9
Dependent Claim
24 words
The method for detecting a scene change as claimed in Claim 8, wherein each of the blocks is a rectangular region in the frame.
Claim 10
Dependent Claim
31 words
The method for detecting a scene change as claimed in Claim 8, wherein time information or image position information of the input image when the scene change is detected is stored.
Claim 11
Dependent Claim
189 words
An image editing apparatus for editing an input image composed of a plurality of frames, comprising: orthogonal transformation means (18) for applying an orthogonal transformation to each of a plurality of blocks into which each of the frames is divided; direct current component extracting means (27) for extracting a direct current component value from the orthogonal transformation; first storage means (29) provided for a first frame for storing the direct current component values of the blocks of the first frame; second storage means (30) provided for a second frame for storing the direct current component values of the blocks of the second frame; switch means (28) for selectively inputting the direct current component values to said first storage means or said second storage means for each of the frames; difference extracting means (31) for referring to said first and second storage means to calculate the absolute values of the differences between the direct current component values of corresponding blocks of the first and second frames; and discriminating means (33) for discriminating the presence or absence of a scene change in the input image based on the said absolute values.
Claim 12
Dependent Claim
55 words
The image editing apparatus as claimed in Claim 11, wherein said discriminating means (33) counts the number of blocks for which the absolute value exceeds a first threshold value and, when the number is higher than a second threshold value, determines that there is a scene change between the first frame and the second frame.
Claim 13
Dependent Claim
20 words
The image editing apparatus as claimed in Claim 12, wherein the plurality of frames are inputted in a time series.
Claim 14
Dependent Claim
21 words
The image editing apparatus as claimed in Claim 11, 12 or 13, wherein the orthogonal transformation is a discrete cosine transformation.
Claim 15
Dependent Claim
43 words
The image editing apparatus as claimed in Claim 11, 12, 13 or 14, further comprising external storage means for storing time information or position information of the input image at a point at which it is determined that there is a scene change.
Claim 16
Dependent Claim
32 words
The image editing apparatus as claimed in Claim 15, further comprising control means for controlling the read-out of an image outputting apparatus in response to the time information or the position information.
Claim 17
Dependent Claim
95 words
Apparatus for detecting a scene change, comprising means (18) for generating by means of an orthogonal transformation, preferably a discrete cosine transform, a signal representing the spatial-frequency distribution for each of a plurality of blocks into which an input image is divided, detecting means (27) coupled to the receiving means for detecting the direct current component of the spatial-frequency distribution for each block, and means (33) coupled to the detecting means for determining the amount of variation of the direct current component between frames and selectively generating a scene change output signal in response thereto.
Claim 18
Dependent Claim
110 words
Apparatus for detecting a scene change, comprising receiving means (23) for receiving a signal representing the spatial-frequency distribution for each of a plurality of blocks into which an input image is divided, detecting means (27) coupled to the receiving means for detecting the direct current component of the spatial-frequency distribution for each block, means (33) coupled to the detecting means for determining the amount of variation of the direct current component between frames and selectively generating a scene change output signal in response thereto, and inverse orthogonal transformation means coupled to the receiving means for transforming the spatial-frequency distribution with an inverse orthogonal transform, preferably an inverse direct cosine transform.
References Cited (Backward Citations)
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