JPH0683440B2 - Motion detection device for television signals - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motion detection device for television signals.

2. Description of the Related Art Television signal motion detectors are widely used for signal processing between frames, such as noise reduction and interframe coding.

FIG. 3 shows the configuration of a conventional motion detecting device.
Is an input terminal for inputting an input television signal, 2 is a frame memory for delaying a frame period, 3 is a frame memory for delaying the input television signal by one frame 2
A subtraction circuit 4 for subtracting the output is an absolute value circuit for performing an absolute value process of the subtraction result of the subtraction circuit 3, and a signal corresponding to the movement during one frame is obtained. An arc starting point control circuit 5 detects a false motion signal due to noise or the like and removes it. In this operation, the motion signal of the absolute value circuit 4 is detected by the comparison circuit 6 to be larger than the set value of the set value circuit 7 which is set to an arbitrary value, and is supplied to the arc starting point detection circuit 8. The arc starting point detection circuit 8 is composed of a storage circuit and a predetermined logic processing circuit, for example, a logical sum circuit. The operation is the fourth
It will be described with reference to the drawings. In FIG. 5, 10 to 16 indicate sample points of the motion signal of each pixel. For example, in order to detect whether the output of the comparison circuit 6 of 13 sample points is an arc starting point, left and right 3 points, 10, If the logical sum of 11,12,14,15,16 is created, and even if there is at least one motion signal, 13 pixels will not be arc starting points. Is a motion signal, it is determined to be the arc starting point, and a detection signal is supplied to the arc starting point removing circuit 9. The arc starting point removing circuit 9 is composed of a selection circuit, and if the arc starting point is the arc starting point, the motion signal is set to “0” by the detection signal of the arc starting point detection circuit 8, otherwise the signal is detected as it is, It is sent out as a control signal such as noise reduce.

Problems to be Solved by the Invention However, in the above-described configuration, the correct arc start point removal of the motion signal cannot be performed due to the S / N state of the input television signal. For example, if the S / N is good, the arc starting point is less likely to occur, and the area for detecting the arc starting point can be widened. On the contrary, if the S / N is bad, the arc starting point is frequently generated. Therefore, if the area where the arc starting point is detected is widened in the same manner as in the case where the S / N is good, the arc starting point is not removed but is directly sent as a motion signal, and the correct arc starting point cannot be removed.

Means for Solving the Problems The present invention relates to an S / N detection circuit for an input television signal, and an arc start point area switching circuit for switching an area for detecting an arc start point according to the output of the S / N detection circuit. And a pixel which is detected as an arc start point is a front and rear, left and right pixel or an arc start point removal circuit which replaces an average value motion signal with a television signal motion detection apparatus.

Operation The present invention has the above-mentioned configuration,
If the S / N is detected and the S / N is in a good state, the arc starting point area switching circuit controls the area widely, and if the S / N is in a bad state, the arc starting point area is narrowed. By controlling to, it is possible to detect a highly accurate motion signal.

Embodiment FIG. 1 shows a block diagram of a motion detection apparatus for a television signal in an embodiment of the present invention. In FIG. 1, those that operate in the same manner as the conventional ones are given the same numbers and their explanations are omitted. Reference numeral 17 is an S / N detection circuit for detecting the S / N of the input television signal, and 18 is an arc start point area switching circuit for switching the area of the arc start point.

The operation of the motion detecting device for a television signal of the embodiment of the present invention configured as described above will be described below with reference to FIG.

In FIG. 1, the input television signal 1 is supplied to the S / N detection circuit 17 to detect S / N. The S / N is detected, for example, by integrating the high frequency component of the pedestal period of V blanking. Next, the S / N state is supplied to the arc starting point area switching circuit 18, and switching is performed as shown in the table below.

FIG. 2 shows an example of changing the area of the arc starting point. In FIG. 2, when detecting whether 23 pixels are motion signals of arc starting points, detection is performed in 21 areas when S / N is good, in 20 areas when S / N is bad, and in 22 areas when normal. .

As described above, the arc starting point of the motion signal is detected and supplied to the arc starting point removing circuit 19. The first arc starting point removing circuit 9 of the conventional device controls so as to be “0” when the arc starting point is detected. It replaces the average value. Therefore, if the S / N is in a good state, a motion signal having a value close to "0" is sent out, and if the S / N is in a bad state, a motion signal having the same value as the preceding and succeeding pixels is sent out.

As described above, according to the present invention, the input television signal
By detecting the S / N and switching the setting value of the arc starting point and the area, a highly accurate motion signal can be detected. Further, by changing the setting value 7 of the comparison circuit 6 depending on the state of S / N (not shown), the arc starting point of the motion signal area can be detected, and the accuracy can be further improved.

As described above, according to the present invention, the S / N of the input television signal is detected, if the S / N is good, the area of the arc starting point is widened, or if it is bad, it is narrowed, Controlling the removal of the arc starting point enables more accurate detection of a motion signal, and its practical effect is great.

[Brief description of drawings]

FIG. 1 is a block diagram of a motion detecting device for a television signal according to an embodiment of the present invention, FIG. 2 is a diagram showing an arc starting point detection region of the same embodiment, and FIG. 3 is a block diagram of a conventional device. FIG. 4 is a diagram for explaining the arc starting point detection region of the conventional device. 17 ... S / N detection circuit, 18 ... Arc starting point area switching circuit, 19 ...
… Arc start point removal circuit.

Claims (2)

[Claims] 1. An apparatus for detecting a moving part of a television signal, the S / N detecting an S / N of the television signal.
A detection circuit, a delay circuit that generates a difference between frames and a subtraction circuit, an absolute value circuit that converts the output of the subtraction circuit into an absolute value, and an output point of the S / N detection circuit to determine the arc starting point of the motion signal. An arc starting point area switching circuit for switching the area to be detected, and a comparison circuit for comparing the output of the absolute value circuit with an arbitrary set value,
An arc starting point detection circuit for detecting the arc starting point in the area set by the output of the arc starting point area switching circuit, and an arc of the absolute value circuit output at the output of the arc starting point detection circuit. A motion detecting device for a television signal, comprising an arc starting point removing circuit for controlling a starting point. 2. A movement of a television signal according to claim 1, further comprising an arc starting point removing circuit for replacing the starting point of the movement with a signal of one pixel on either the left or right or the upper or lower side or an average value. Detection device.