JP3260570B2 - Motion detection device - Google Patents

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 motion of an image of a video signal.

[0002]

2. Description of the Related Art A motion detecting device for detecting the motion of an image is:
A difference signal between frames of a video signal is input, and a motion detection signal indicating a degree of motion according to the magnitude of the absolute value of the difference signal is obtained.

FIG. 3A shows a block diagram of a configuration of a motion detecting apparatus, and FIG. 3B shows an example of input / output characteristics of the motion detecting apparatus. In FIG. 3A, the input terminal 11
, The luminance converter 12 is supplied with an inter-frame difference signal of the luminance signal. The luminance converter 12 derives a luminance motion detection output to the output terminal 13 according to the input level of the inter-frame difference signal. Further, an inter-frame difference signal of the color signal is supplied to the color converter 22 through the input terminal 21. The color converter 22 derives a color motion detection output to an output terminal 23 according to the input level of the inter-frame difference signal.

The luminance converter 12 and the color converter 22 are:
The input / output characteristics can be switched by switching the parameters. The luminance motion detection parameter is supplied to the parameter control unit of the luminance converter 12 via the selector 14. The parameter control unit of the color converter 22 is supplied with the color motion detection parameter via the selector 24.

[0005] The input / output characteristics of the luminance converter 12 and the color converter 22 are switched according to the parameters. FIG. 3B shows a plurality of input / output characteristics b1, b2, b3, b
4 and b5 are shown. Input / output characteristics are offset part,
It consists of an inclined part and a saturated part. When the offset portion approaches the origin (see characteristics b1, b2, and b3), the motion detection sensitivity becomes sharp, and when the offset portion moves away from the origin (see characteristics b4 and b5), the motion detection sensitivity decreases. In addition, the input / output characteristics are such that when the inclination of the inclined portion is steep (see characteristics b1, b2, and b4), the motion detection sensitivity becomes sharp, and when the inclination becomes gentle (characteristic b).
3, b5), and the motion detection sensitivity is reduced.

[0006] Switching control of the motion detection sensitivity is performed, for example, by distinguishing between a flat portion where the level change of the image is small and an edge portion, and lowering the sensitivity at the edge portion compared with the sensitivity at the flat portion (in the edge portion). This is because it is easy to erroneously determine a still image as a motion due to noise.) In order to increase the sensitivity, there is a method of bringing the offset portion closer to the origin or making the inclination steeper, but the control is performed by either method.

Further, in addition to the distinction between the flat portion and the edge portion, it is conceivable to switch and control the detection sensitivity depending on whether or not panning is performed. Therefore, considering the video content when the pan determination information and the edge determination information are combined, (a) a flat portion when it is determined that a motion image such as a pan is continuous for a certain period of time, (b) An edge portion when it is determined that an image of a motion such as a pan is continuous for a certain period of time, (c) a flat portion when it is determined that a still image is continuous for a certain period of time, and (d) a still image The edge part when it is determined that it is continuous for a certain period of time. There are four possibilities. In the case of (a), since the panning is performed, it is necessary to make it easy to determine that the image is a moving image. Further, in the case of (b), since it is an edge portion, it is necessary to further lower the sensitivity than in the case of (a). In the case of (c), the sensitivity may be lower than in the cases of (a) and (b), and in the case of (d), the sensitivity must be lower than in the cases of (a), (b) and (c). There is.

In addition, the motion detection of the color signal and the luminance signal is set to have slightly different characteristics. for that reason,
As shown in FIG. 3B, the motion detection parameters of the luminance signal system and the color signal system are slightly different. That is, the sensitivity of the motion detection for the color signal is set to be low even under the same external condition.

[0009]

As described above, in the conventional motion detection device of the type in which the motion detection parameters are switched in accordance with the pan detection signal and the edge judgment signal, motion detection is performed for each of the luminance signal system and the chrominance signal system. Parameters are prepared. These motion detection parameters are stored in the memory, but the setting and storage operations are complicated and time-consuming. Furthermore, in order to prepare motion detection parameters for each of the luminance signal system and the chrominance signal system, a memory and an output line for the parameters are required, which increases the circuit scale of the motion detection device.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a motion detection device which can easily set motion detection parameters, can simplify the circuit configuration around the device, and can obtain a motion detection sensitivity adapted to an image. I do.

[0011]

According to the present invention, a luminance frame difference signal of a luminance signal is input, and a converted output of the luminance frame difference signal is derived as a luminance motion detection signal according to a first motion detection parameter. Color signal motion detection circuit for inputting a luminance signal motion detection circuit and a color signal difference signal of a color signal, and deriving a converted output of the color frame difference signal as a color motion detection signal in accordance with a second motion detection parameter A circuit, a first selector for selecting and deriving the first motion detection parameter from a plurality of types of input motion detection parameters, and a second motion detection parameter from the plurality of types of input motion detection parameters And a second selector for selecting and deriving the image information, and video state detection information,
A first converted output corresponding to the detection information is supplied to a control terminal of the first selector, and a second converted output is supplied to a control terminal of the second selector .
Switching or writing conversion data for the second conversion output
And a replaceable data converter.

[0012]

According to the above-mentioned means, by setting the first and second conversion outputs of the data converter, each of the luminance signal system and the chrominance signal system can be arbitrarily selected from the input motion detection parameters. The detection parameters can be set. That is, even if the input motion detection parameter is one system, the motion detection sensitivity of luminance and color can be set arbitrarily. Therefore, the operation of setting the motion detection parameter in the memory is １ ／ of the conventional operation. Also, the circuit scale can be reduced without having to prepare a memory for motion detection parameters for luminance and color systems unlike the related art.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of the present invention. Input terminal 4
1, a luminance frame difference signal of the luminance signal is input,
It is introduced to the luminance motion detection circuit 42. The luminance motion detection circuit 42 derives a converted output of the luminance frame difference signal to the output terminal 43 as a luminance motion detection signal according to the first motion detection parameter (for example, 6 bits).

An input terminal 51 receives a color frame difference signal of a color signal, which is introduced to a color motion detection circuit 52. The color motion detection circuit 52 derives the converted output of the color frame difference signal to the output terminal 53 as a color motion detection signal according to the second motion detection parameter (for example, 6 bits).

Reference numeral 44 denotes a first selector, and a memory 60
The first motion detection parameter is selected and derived from among a plurality of types of input motion detection parameters (6 bits each) set in. Reference numeral 55 denotes a second selector, which selects and derives the second motion detection parameter from a plurality of types of input motion detection parameters set in the memory 60. Selector 4 above
4 and 55, the selection states are controlled by first and second conversion outputs (each of which is a 2-bit control signal) from the data converter 71. The data converter 71 receives at least the pan detection information and the edge detection information, supplies a first conversion output according to the detection information to a control terminal of the first selector, and outputs a second conversion output to the second selector. To the control terminal of the second selector.

By setting the conversion mode of the data converter 71 so that the first and second converted outputs can be obtained, each of the luminance signal system and the chrominance signal system can be selected from the input motion detection parameters. Can set an arbitrary motion detection parameter. In other words, even if the input motion detection parameters are provided in one system of the memory 60, the luminance and color motion detection sensitivity can be set arbitrarily. Therefore, the operation of setting the motion detection parameter in the memory is １ ／ of the conventional operation. Here, the motion detection parameters are stored in the memory 60 in order from the one with the highest motion sensitivity to the one with the lowest motion sensitivity. Then, the data converter 71 only needs to store information on which of the motion detection parameters should be selected from among the motion detection parameters, so that the motion detection parameters can be easily set. Also, the circuit scale can be reduced without having to prepare a memory for motion detection parameters for luminance and color systems unlike the related art.

FIG. 2 is a diagram for explaining specific motion detection characteristics in the above embodiment. Now, memory 6
0 stores motion detection parameters A, B, C, and D (the same reference numerals are also assigned to the characteristics) for setting four types of motion detection characteristics as shown in FIG. I do.
Here, as the conversion mode of the data converter 71, a table as shown in FIG. 2B is set for the luminance signal system, and a table as shown in FIG. 2C is set for the chrominance signal system. It is assumed that Then, when there is no pan detection and there is no edge, the characteristic C is set in the luminance signal system, and the characteristic D is set in the color signal system (the detection sensitivity is set to be lower in the color system than in the luminance signal system). When there is no pan detection and there is an edge, the characteristic D is set for the luminance signal system, and the characteristic D is also set for the chrominance signal system. There is also bread detection,
When there is no edge, characteristic A is set in the luminance signal system, and characteristic B is set in the chrominance signal system. When pan detection is present and there is an edge, characteristic B is set in the luminance signal system, and characteristic C is set in the chrominance signal system.

The reason why the detection sensitivity is sharply set when the pan is detected is that the motion adaptive type three-dimensional Y / C separation circuit or the like can perform more appropriate processing by processing the input video signal as a moving image. The reason why the detection sensitivity is reduced when an edge is detected is to prevent a malfunction such as processing as a moving image despite being a still image.

The present invention is not limited to the above embodiment. In the above description, the conversion data of the data converter 71 has been described as being fixed in advance, but the conversion data may be rewritable and changeable. With this configuration, the motion detection characteristics of the luminance signal system and the chrominance signal system can be changed according to the type and quality of the input video signal. If the conversion data can be switched automatically or manually, the motion detection characteristics can be enhanced.

Therefore, according to the present invention, it is possible to realize a motion detection device which can easily set motion detection parameters, can simplify the circuit configuration around the device, and can obtain a motion detection sensitivity adapted to an image .

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing one embodiment of the present invention.

FIG. 2 is an explanatory diagram of characteristics and a table shown for explaining an operation example of the apparatus of FIG. 1;

FIG. 3 is an explanatory diagram of a conventional motion detection device and motion detection characteristics.

[Explanation of symbols]

42: luminance motion detection circuit, 52: color motion detection circuit
44, 55: selector, 60: memory, 71: data converter.

Continuation of front page (56) References JP-A-1-318491 (JP, A) JP-A-3-220889 (JP, A) JP-A-4-165788 (JP, A) JP-A-5-22752 (JP) , A) JP-A-5-219531 (JP, A) JP-A-6-141335 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04N 11/04 H04N 9/64

Claims (1)

(57) [Claims] 1. A luminance signal motion detection circuit to which a luminance frame difference signal of a luminance signal is input and derives a converted output of the luminance frame difference signal as a luminance motion detection signal in accordance with a first motion detection parameter; A color signal motion detection circuit which receives a color frame difference signal of a color signal, and derives a converted output of the color frame difference signal as a color motion detection signal in accordance with a second motion detection parameter; A first selector for selecting and deriving the first motion detection parameter from the detection parameters; and a second selector for selecting and deriving the second motion detection parameter from the plurality of types of input motion detection parameters. And the video state detection information are input, a first converted output corresponding to the detected information is supplied to a control terminal of the first selector, and a second converted output is supplied to the control terminal of the first selector. Is intended to supply to the control terminal of the serial second selector, said first, second for the conversion output
A data converter capable of switching or rewriting the conversion data .