JPH06141288A - Motion detector - Google Patents

Abstract

PURPOSE:To obtain motion information accurately by detecting motion data at an area in each of horizontal, vertical and oblique directions to obtain OR operation of the data. CONSTITUTION:An inter-frame motion data detection circuit 2 detects motion data from an input video signal from an input terminal 1 and the data are inputted to area motion discrimination circuits 11, 12, 13 for a longitudinal line, a lateral line and an oblique line. The longitudinal line motion discrimination circuit 11 counts number of times of occurrence of a motion of an area in three objective picture elements consecutive in the longitudinal direction, compares it with a prescribed value and outputs 1 or 0 representing information of motion to an OR circuit 14 depending on the quantity relation between the compared values. Furthermore, Lateral and oblique line area motion discrimination circuits 12, 13 implement similar processing to that by the discrimination circuit 11 as to an area of 5 consecutive objective picture elements in the lateral direction and the oblique direction and give an output to the OR circuit 14, in which the inputs from the circuits 11, 12, 13 are ORed. Thus, the accurate motion in the thin longitudinal, lateral and oblique lines is detected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motion detecting device for detecting a moving area of a video signal.

[0002]

2. Description of the Related Art A conventional video signal motion detecting apparatus is disclosed in, for example, Japanese Patent Laid-Open No. 1-318383.

FIG. 6 is a block diagram of this conventional motion detecting apparatus, in which 1 is an input terminal for inputting a video signal, and 2 is an input terminal.
Is a frame memory, subtraction circuit, and absolute value circuit (not shown)
The inter-frame motion data detection circuit 3 for detecting motion data from the inter-frame difference signal of the video signal input from the input terminal 1 is composed of a counting circuit and a comparison circuit (not shown). Area motion determination circuit that counts within an arbitrary area and determines whether or not the value is equal to or greater than a predetermined value, 4
Is an AND circuit, 5 is an OR circuit, and 6 is an output terminal of a motion detection signal.

The operation of the conventional motion detecting device configured as described above will be described. In FIG. 6, the video signal coming from the input terminal 1 is supplied to the interframe motion data detection circuit 2. The inter-frame motion data detection circuit 2 detects the inter-frame difference signal by the frame memory and the subtraction circuit, and further performs absolute value processing by the absolute value circuit and supplies it to the regional motion determination circuit 3 as motion data for one frame.

Next, the area motion determination circuit 3 will be described with reference to FIG. In FIG. 7, 30 is a target pixel point for determining the presence or absence of motion, 31 is a determination region (for example, 5 horizontal points,
The total of 15 points (vertical 3 points), "0" of each pixel is the motion data of the non-moving part, and "1" is the motion data of the moving part. When the motion data shown in FIG. 7A is supplied to the area motion determination circuit 3, the area motion determination circuit 3 is moving "1".
Is counted and the comparison circuit determines whether or not the counting result is equal to or more than a predetermined value. If it is equal to or more than the predetermined value, “1” is output, and if less than the predetermined value, “0” is output.

For example, in the case of the motion data shown in FIG. 7A, when the predetermined value is "7" (more than half of the area), the output signal of the area discrimination circuit becomes as shown in FIG. The movement of the pixel 30 changes from “0” to “1” and is supplied to the OR circuit 5 to reproduce and output the movement signal. If the value is less than the predetermined value, "0" is supplied to the AND circuit 4 and is removed even if a motion occurs. As described above, extra movement and omission due to noise are prevented.

[0007]

However, the conventional structure as described above has a problem in that when a thin line moves fast, the motion leaks. Figure 7
Shown in (c) and (d). FIG. 7C shows motion data when the thin vertical line moves fast in the horizontal direction, and FIG.
Indicates movement data when a thin horizontal line moves fast in the vertical direction. As shown in FIGS. 7 (c) and 7 (d), if the predetermined value of the area motion determination circuit 3 is set to “7” as in the conventional example when a thin line moves fast, in the case of FIGS. 7 (c) and 7 (d), When it is determined that there is no movement, a signal of "0" is supplied to the AND circuit 4 and the movement signal disappears. Further, if the predetermined value of the area movement determination circuit 3 is lowered, there is a problem that an extra movement is produced.

In view of the above point, the present invention has an object to provide a motion detecting device capable of accurately extracting motion information.

[0009]

According to a first aspect of the present invention, there is provided an interframe motion data detection circuit for detecting motion data from an interframe difference signal of a video signal and an arbitrary motion data in horizontal, vertical and diagonal directions. A horizontal line / vertical line / diagonal line region motion determination circuit for determining the presence / absence of each motion in a region, and a logical sum circuit for logically adding output signals of the horizontal line / vertical line / diagonal line region motion determination circuit It is a composition.

A second invention is an interframe motion data detection circuit for detecting motion data from an interframe difference signal of a video signal, and an edge detection circuit for detecting horizontal, vertical and diagonal edges from the video signal. , Horizontal / vertical / diagonal line motion detection circuit, edge detection circuit, horizontal line / vertical line / diagonal line motion, for determining the presence / absence of motion in horizontal, vertical and diagonal areas of motion data This is a configuration including a plurality of AND circuits that logically AND the output signals of the detection circuits and an OR circuit that ORs the output signals of the AND circuits.

According to a third aspect of the present invention, there is provided an inter-frame motion data detection circuit for detecting motion data from an inter-frame difference signal of a video signal, and an edge detection circuit for detecting horizontal, vertical and diagonal edges from the video signal. , A delay circuit for delaying the output signal of the edge detection circuit for one frame, a first OR circuit for ORing the output signals of the edge detection circuit and the delay circuit, and motion data in horizontal, vertical and diagonal directions Output signals from the horizontal line / vertical line / diagonal line region motion determination circuit, the first logical sum circuit, the horizontal line / vertical line / diagonal line region motion determination circuit, respectively. This is a configuration including a plurality of logical product circuits and a second logical sum circuit that logically sums output signals of the respective logical product circuits.

[0012]

According to the first aspect of the present invention, the motion data detected by the inter-frame motion data detecting circuit is detected in each of the horizontal, vertical and diagonal areas and the output thereof is logically ORed by the above-mentioned structure. Even if a thin vertical line, horizontal line, or diagonal line moves, it is possible to obtain accurate motion information.

According to a second aspect of the present invention, the motion data detected by the interframe motion data detection circuit having the above-described structure is detected in the horizontal, vertical and diagonal areas, and the output thereof is detected by the edge detection circuit. By controlling with the edge signal, it is possible to accurately obtain motion information even when a thin vertical line, horizontal line, or diagonal line moves.

According to a third aspect of the present invention, the motion data detected by the inter-frame motion data detection circuit having the above-described configuration is detected in the horizontal, vertical and diagonal areas, respectively, and the motion signal is delayed between the edge detection circuit and the frame. By controlling the output signal of the edge detection circuit with the output signal obtained by the logical sum, the movement information can be obtained more accurately even if the vertical line, the horizontal line, or the diagonal line moves.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of a motion detecting device according to a first embodiment of the present invention.

In FIG. 1, 11 is a vertical line area motion determination circuit for determining the presence or absence of horizontal movement, 12 is a horizontal line area motion determination circuit for determining the presence or absence of vertical movement, and 13 is the presence or absence of diagonal movement. Is a diagonal line area motion determination circuit, and 14 is a logical sum circuit that logically sums the output signals of the respective area determination circuits. In each of the following drawings, functional blocks having the same function are designated by the same reference numerals, and those operating in the same manner as conventional ones are designated by the same reference numerals and description thereof will be omitted.

The operation of the motion detecting apparatus of this embodiment having the above-described structure will be described below with reference to FIG. 2 showing the motion determining area.

In FIG. 1, the video signal arriving at the input terminal 1 is supplied to the interframe motion data detection circuit 2 and processed in the same manner as in the prior art to detect the motion data. The detected motion data is input to the vertical line area motion determination circuit 11, the horizontal line area motion determination circuit 12, and the diagonal line area motion determination circuit 13. The vertical line area motion determination circuit 11 uses the solid line 11 in FIG.
The number of times of occurrence of motion is counted in three consecutive pixel regions of interest shown in 0 in the vertical direction, compared with a predetermined value, and when it is larger than the predetermined value, it is determined to be motion, and when the motion information of "1" is small, The motion information “0” is supplied to the OR circuit 14.

The horizontal line area motion determination circuit 12 and the diagonal line area motion determination circuit 13 are composed of 5 pixel areas of interest 120 continuous in the horizontal direction and 5 pixel areas of interest 130 continuous in the oblique direction shown in FIGS. 2B and 2C. Is processed in the same manner as the vertical line area motion determination circuit 11 and supplied to the OR circuit 14. Therefore, as shown in FIGS. 7A and 7B, it is possible to accurately detect the movement of a thin vertical line, a horizontal line, or an oblique line that cannot be detected conventionally.

As described above, according to this embodiment, the motion data detected by the inter-frame motion data detection circuit 2 is detected in each of the horizontal, vertical and diagonal areas, and the output is logically ORed. , Even if a thin vertical line, horizontal line, or diagonal line moves, the motion information can be accurately obtained.

Although the motion judging circuit judges vertical lines, horizontal lines and diagonal lines, it goes without saying that a judging circuit for average values may be added as in the conventional case. Further, the number of pixels in each target pixel region is not limited to 5 pixels or 3 pixels,
The target pixel area is not limited to the areas shown in FIGS. 2A, 2B, and 2C, and may be an area shifted vertically or horizontally, or an area having a different degree of inclination. Further, in FIG. 2, the judgment area indicated by the dotted line also has 5 horizontal points and 3 vertical points.
The number of points is not limited to 15 in total, and may be, for example, 12 points in total of 4 horizontal points and 3 vertical points, or 20 points in total of 5 horizontal points and 4 vertical points.

The second embodiment of the present invention will be described below with reference to the drawings. FIG. 3 shows a block diagram of a motion detecting apparatus in the second embodiment of the present invention.

In FIG. 3, reference numeral 15 denotes an edge detection circuit, 1
Reference numerals 6, 17, and 18 are AND circuits, each of which has the above-described circuits added to the first embodiment.

The operation of the motion detecting apparatus of this embodiment constructed as above will be described below.

First, the video signal arriving at the input terminal 1 is supplied to the interframe motion data detection circuit 2 and the edge detection circuit 15. The inter-frame motion data detection circuit 2 detects motion data, and the detected motion data is input to vertical line, horizontal line, and diagonal line area motion determination circuits 11, 12, and 13, respectively.

Next, the operation of the edge detection circuit 15 will be described with reference to the block diagram of FIG. In FIG. 4, the input video signal is input to the 1H delay circuit 150 and the 1-pixel delay circuit 151. The signal delayed by 1H by the 1H delay circuit 150 is supplied to the subtraction circuit 152. The subtraction circuit 152 subtracts the output signal of the 1H delay circuit 150 and the input video signal to detect the edge signal of the horizontal line component, and the horizontal line detection circuit 154, the vertical line detection circuit 155, the diagonal edge detection circuit 156, and the edge component detection circuit 157. Supply.

Next, the signal delayed by one pixel in the one-pixel delay circuit 151 is supplied to the subtraction circuit 153, and the subtraction circuit 153.
Detects the edge signal of the vertical line component by subtracting the output signal of the 1-pixel delay circuit 151 and the input video signal, and the vertical line detection circuit 15
5, the horizontal line detection circuit 154, the diagonal edge detection circuit 156, and the edge component detection circuit 157.

The horizontal line detection circuit 154 is composed of a gate circuit and detects the edge component of only the horizontal line by removing the edge signal of the vertical line component from the input edge signal of the horizontal line component, and detects only the edge signal region of the horizontal line. 1 ”signal,
If not, a "0" signal is supplied to the logic circuit 17. The vertical line detection circuit 155 is also composed of a gate circuit, and detects the edge component of only the vertical line by removing the edge signal of the horizontal line component from the input edge signal of the vertical line component,
A signal of "1" is supplied to the logic circuit 16 only in the area of the edge signal of the vertical line, and a signal of "0" is supplied otherwise. The diagonal line detection circuit 156 is also composed of a gate circuit, and detects the diagonal line edge signal by detecting only when the input vertical line component and horizontal line component both exist, and only the diagonal line edge signal area "1" is detected. ] Signal is supplied to the logic circuit 16 otherwise.

Next, the edge component detection circuit 157 detects the case where both the vertical line and horizontal line edge components do not exist and supplies them to the horizontal line, vertical line and diagonal line detection circuits 154, 155 and 156. Horizontal line, vertical line and diagonal line detection circuits 154, 155, 15
When a signal having no edge is supplied to 6, the signals of all "1" are supplied to the AND circuits 16, 17, and 18. The logical product circuits 16, 17, and 18 are the respective motion determination circuits 1
The output signals of 1, 12, and 13 and the output signal of each edge component of the edge detection circuit 15 are supplied to perform logical product processing, and the logical product output is supplied to the logical sum circuit 14. Therefore, the motion determination output signals of the motion determining circuits 11, 12, and 13 are controlled by the signals of the respective edge components, so that the motion signals can be detected more accurately than in the first aspect of the invention.

As described above, according to this embodiment, the motion data detected by the inter-frame motion data detection circuit is detected in each of the horizontal, vertical and diagonal areas, and the output thereof is detected by the edge detection circuit. By controlling with each edge signal, even if a thin vertical line, a horizontal line, or a diagonal line moves, the motion information can be obtained more accurately.

It should be noted that when the edge detecting circuit 15 has no edge component, it is controlled so that all the output signals of the motion discriminating circuit are passed, but the motion discriminating circuit discriminates by the average value as in the conventional case. A motion discriminating circuit to be processed may be added to control by another system.

The third embodiment of the present invention will be described below with reference to the drawings. FIG. 5 is a block diagram of a motion detecting device according to the third embodiment of the present invention.

In FIG. 5, 20 is an edge detection circuit 15.
A frame memory that delays the output signal of
Reference numeral 21 is a first OR circuit for ORing the edge signal delayed for one frame and the edge signal of the current frame, which is provided for the third embodiment.

The operation of the motion detecting apparatus of this embodiment constructed as described above will be described below. First, the video signal arriving at the input terminal 1 is supplied to the inter-frame motion data detection circuit 2 and the edge detection circuit 15. The inter-frame motion data detection circuit 2 detects the motion data and inputs it to the vertical line, horizontal line, and diagonal line area motion determination circuits 11, 12, and 13.

Next, the edge detection circuit 15 is processed in the same manner as in the second embodiment and supplied to the frame memory 20 and delayed for one frame. Each edge detection signal delayed by one frame in the frame memory 20 is input to the first OR circuit 21 and is OR-processed with each edge detection signal of the current frame and the previous frame. The output signal of the first logical sum circuit 21 is supplied to the logical product circuits 16, 17, and 18. AND circuit 16, 1
7 and 18 are processed in the same manner as in the second embodiment, and the output signals of the motion determination circuits 11, 12 and 13 and the output signals of the respective edge components of the first OR circuit 21 are respectively subjected to logical product processing, and The logical product output is supplied to the second logical sum circuit 22. Therefore, the motion determination output signals of the motion determining circuits 11, 12 and 13 are controlled by the signals of the respective edge components of the current frame and the previous frame, so that the motion signals can be detected more accurately than in the second embodiment. .

As described above, according to this embodiment, the motion data detected by the inter-frame motion data detection circuit is detected in the horizontal, vertical and diagonal areas, and the output is detected in the current frame and the previous frame. By controlling with the edge signal detected edge, it is possible to obtain the motion information more accurately even when a thin vertical line, horizontal line, or diagonal line moves.

Although the frame memory 20 is provided to detect the edge signal of the previous frame, the frame memory of the inter-frame motion data detection circuit 2 may be used to add another edge detection circuit. Good. Furthermore, in the first, second, and third embodiments, the differential signal between one frame has been described, but it goes without saying that a difference process between a plurality of frames and fields may be performed.

[0038]

As described above, according to the first aspect of the present invention, the inter-frame motion data detection circuit for detecting motion data from the inter-frame difference signal of the video signal, and the detected motion data in the horizontal direction. A horizontal line / vertical line / diagonal line region motion determination circuit for determining the presence / absence of each motion in vertical and diagonal arbitrary regions, and a logical output signal for each of the horizontal line / vertical line / diagonal line region motion determination circuit By providing an OR circuit for summing, even if a thin vertical line, horizontal line, or diagonal line moves, it is possible to obtain accurate motion information.

According to the second invention, an inter-frame motion data detection circuit for detecting motion data from an inter-frame difference signal of a video signal, and an edge for detecting horizontal, vertical and diagonal edges from the video signal. Detection circuit, horizontal line / vertical line / diagonal line motion detection circuit that determines the detected motion data in arbitrary areas in the horizontal direction, vertical direction, and diagonal direction, edge detection circuit, horizontal line, vertical line, and diagonal line motion By providing a plurality of AND circuits that logically AND the output signals of the detection circuits and an OR circuit that ORs the output signals of the AND circuits, thin vertical lines, horizontal lines, and diagonal lines move. The motion information can be obtained more accurately.

According to the third invention, an inter-frame motion data detection circuit for detecting motion data from an inter-frame difference signal of a video signal and an edge in the horizontal direction, the vertical direction and the diagonal direction are provided in both the current frame and the previous frame. Edge detection circuit to detect with, horizontal line, vertical line and diagonal line to judge the motion data in arbitrary areas in the horizontal direction, vertical direction and diagonal direction respectively, motion detection circuit, edge detection circuit, horizontal line, vertical line and diagonal line By providing a plurality of AND circuits that logically AND the output signals of the motion detection circuits and an OR circuit that ORs the output signals of the AND circuits, thin vertical lines, horizontal lines, and diagonal lines can move. The motion information can be obtained more accurately.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a motion detection device according to a first embodiment of the present invention.

FIG. 2 is a diagram for explaining an area motion determination circuit of the motion detection device according to the first embodiment.

FIG. 3 is a configuration diagram of a motion detection device according to a second embodiment of the present invention.

FIG. 4 is a configuration diagram of an edge detection circuit of a motion detection device according to a second embodiment of the present invention.

FIG. 5 is a configuration diagram of a motion detection device according to a third embodiment of the present invention.

FIG. 6 is a block diagram of a conventional motion detection device.

FIG. 7 is a diagram for explaining the operation of a motion determination circuit of a conventional motion detection device.

[Explanation of symbols]

 2-frame motion data detection circuit 11 vertical line area motion determination circuit 12 horizontal line area motion determination circuit 13 diagonal line motion area determination circuit 14 OR circuit 15 edge detection circuit 16, 17, 18 AND circuit 20 frame memory

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hideaki Yamauchi Inventor Hideaki Yamauchi 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Takuji Okamoto 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd. 72) Inventor Toshihiro Miyoshi 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor ▲ Tsuji ▼ Toshiaki 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (4)

[Claims] 1. An inter-frame motion data detection circuit for detecting motion data from an inter-frame difference signal of a video signal, and determining the presence or absence of motion of each of the motion data in at least arbitrary areas in the horizontal direction, the vertical direction and the diagonal direction. A horizontal line, vertical line, diagonal line area motion determination circuit, and a logical sum circuit that logically sums output signals of the area motion determination circuit. 2. A horizontal line / vertical line / diagonal line area motion determination circuit,
2. The motion detecting apparatus according to claim 1, further comprising a counting circuit for counting motion data generated in an arbitrary area and a comparison circuit for comparing a counting result with a predetermined value. 3. An inter-frame motion data detection circuit for detecting motion data from an inter-frame difference signal of a video signal, an edge detection circuit for detecting horizontal, vertical and diagonal edges from the video signal, and the motion. A horizontal line, a vertical line, and a diagonal line region motion determination circuit that determines the presence or absence of movement in each of the horizontal, vertical, and diagonal arbitrary regions of data;
A plurality of AND circuits for logically ANDing output signals of the edge detection circuit and the area motion determination circuit; and an OR circuit for logically ORing output signals of the AND circuit. Motion detection device. 4. An inter-frame motion data detection circuit for detecting motion data from an inter-frame difference signal of a video signal, an edge detection circuit for detecting horizontal, vertical and diagonal edges from the video signal, and the edge. A delay circuit that delays the output signal of the detection circuit for one frame, a first OR circuit that ORs the output signals of the edge detection circuit and the delay circuit, and the motion data in horizontal, vertical, and diagonal directions. A horizontal line, a vertical line, and a diagonal line area motion determining circuit for determining the presence / absence of motion in each area, and a plurality of logical product circuits that logically AND the respective output signals of the first logical sum circuit and the area motion determining circuit. A motion detecting apparatus comprising a second logical sum circuit that logically sums output signals of the logical product circuits.