JPS6065680A - Detector of dynamic information of picture - Google Patents

Abstract

PURPOSE:To simplify the constitution and to reduce the cost by detecting dynamic information from a processing system of a composite video signal obtained at the reception of broadcast in converting a video signal of the interlacing scanning into a video signal of the sequential scanning system. CONSTITUTION:When a composite difference signal DELTACd representing the difference between frames in the composite video signal of the interlacing scanning is given, values of odd number sampling points P1-P5 are extracted, a value at the sampling point P3 of the center, and values at the points P2, P4 and P1, P3 being symmetrical to the center point P3 are extracted. The output values are added, and after a coefficient is multiplied by coefficient devices 24-26 respectively, the result is added and transmitted as a detected output D0. Thus, the luminance difference signal eliminated with a chrominance signal component and the value integrated to the sampling points P1-P5 are obtained from the detected output D0, this represents the dynamic information of the picture, the noise component in the luminance difference signal is eliminated by the integration operation of the accumulation, and mis-detection due to accidental noise is blocked.

Description

TECHNICAL FIELD The present invention relates to a method for detecting motion information of an image from a video signal when converting a video signal based on interlaced scanning such as the NTSC system into a video signal using a progressive scanning system.

Background technology In standard television systems (NTSC system, SECAM Manshiki, PAL Manshiki, etc.), the luminance signal and color signal are composite signals that overlap on the frequency axis. In this method, cross-casting occurs, and the resolution of the luminance signal decreases in the horizontal and vertical directions, making it impossible to obtain good image quality. However, these methods employ interlaced scanning, which prevents line flicker interference, pairing noise interference, and the phenomenon that image quality deteriorates due to scanning lines being viewed separately. It is occurring.

As a countermeasure for this, the luminance signal and the color signal are separated based on the correlation between frames and scanning lines, and the υ interpolation signal is obtained by line interpolation and Fnoord interpolation. It has been proposed to perform sequential scanning corresponding to one frame of A-interlaced scanning to compensate for the signal, and a progressive scanning conversion device for converting an interlaced scanning video signal into a progressive scanning video signal has been reviewed. For this purpose, a motion detector is used for the purpose of detecting the motion of an image.

However, the conventional motion detector is based on a coring circuit, an isolated point It consists of a removal circuit, a difference signal interpolation circuit, etc., and has the disadvantage of becoming expensive due to the complexity of the structure.

In fact, conventional motion detectors require a low-pass filter for the purpose of removing the component of the interlaced scanning method, which also has the disadvantage of complicating the structure and increasing the cost.

DISCLOSURE OF THE INVENTION The present invention has been made in view of the drawbacks of the conventional art.
The object of the present invention is to provide an image motion information detection system that has a simple and inexpensive configuration and has a noise removal effect and a color signal component removal effect.

In order to achieve this object, in the present invention, a composite signal indicating the difference between frames in an interlaced composite video signal is supplied in units of one scanning line, so that odd numbers of adjacent scanning lines are a delay means for extracting a center composite difference signal value at a sampling point; a first addition means for extracting composite difference signal values at mutually symmetrical positions on the left and right with respect to the delay means; a plurality of coefficient multipliers for multiplying the output values of the means and the output values of the delay means by coefficients; The addition means 2 forms a low-frequency wave transducer having a characteristic of blocking color signal components depending on the selection of the coefficients described above.

Therefore, according to the present invention, it is possible to realize a motion detection means having a noise removal function and a color signal component removal function with a simple and inexpensive configuration, and it is possible to realize a motion detection means that has a noise removal function and a color signal component removal function, and can be used for broadcasting without going through the signal processing process of YC separation as in the past. Good motion information can be detected from the processing system of the composite video signal obtained by reception.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to figures showing embodiments.

FIG. 1 is a block diagram showing a specific example of a motion information detector to which the present invention is applied.
A luminance signal YF separated from a field based on the correlation between frames and an illuminance signal YL separated based on the correlation between scanning lines in the same field are given. , each with a delay of 1
, 2, and then multiplied by the coefficients Ky and Kt by the coefficient multipliers 3 and 4, and then added by the adder 5, and sent out as a luminance signal YR for sequential scanning.

- 10,000, a composite difference signal ΔC indicating the difference between frames is given to the motion detector 6, and the detector 6 extracts a luminance difference signal component from the composite difference signal ΔC and detects a change in the luminance difference signal component. In order to generate a force and apply it to the coefficient generator 7, the same generator 7 sends out signals indicating the complementary varying coefficients KF, KL, which in turn controls the coefficients to be multiplied by the coefficient generator 3.4. do.

Therefore, when the image displayed by the video signal is a still image, the coefficient KF is increased, when the image is a moving image, the coefficient KL is increased, and when the image is in an intermediate state, both coefficients KP are increased accordingly. , KL, the dependence of the illuminance signal YR on the luminance signals YF and YL is determined.

In other words, in the case of a still image, the luminance signal YF can be used as the luminance signal YR since there is no change in the 4 degrees of each frame, but in the case of a moving image, the luminance changes in each frame, and if the luminance signal YF is used, Since the result is inaccurate, the luminance signal YL must be used as the luminance signal, and in the intermediate state between a still image and a moving image, the luminance signal YL is changed depending on the degree of
It is required to mix F and YL in a suitable ratio, and these operations are realized by the configuration shown in Figure @1.

It should be noted that the coefficient generator 7 has a plurality of threshold levels, and after determining the detection level of the motion detector 6, sends a signal indicating the coefficients KF and KL in accordance with this. It will be done.

The interpolated luminance signal is requested by a separate circuit based on a signal equivalent to the luminance signal YF + YL, is stored together with the luminance signal YR in a memory, etc., and is then processed for interlaced scanning. However, it is transmitted at twice the scanning speed, resulting in a progressive scanning luminance signal.

Furthermore, the motion detector 6 and the coefficient generator γ are used not only to control the circuit that generates the luminance signal YR, but also to control the circuit that generates the interpolated luminance signal, the circuit that generates the color signal for sequential scanning, etc. can also be used.

2 is a block diagram showing an embodiment of the present invention. A composite difference signal ΔCd indicating a difference between frames digitized in response to a sampling clock pulse is applied to a register 21a at the first stage. This register 21a stores and sends data with a time difference corresponding to one cycle of the sampling clock pulse. Also, this register 21. Similar registers 21b, 21c, .
21d are connected in cascade, and these registers 21 in even number stages.
Form groups a to 21d. Therefore, each register 21a
Since there is a delay corresponding to one sampling period between the input and output of the registers 21a to 21d, when the composite difference 'IH signal ΔCd is sequentially transmitted by the registers 21a to 21d, the register 21. , and each output of the registers 21a to 21d, one sampling point P] to l)b which are contiguous to each other on the scanning line are extracted.

That is, among the sampling points PI-P5, the composite difference signal value at the central sampling point P8 is here derived from the output of the register 21b. Registers 21a and 21b therefore form delay means here. Further, sampling points P2, . The composite difference signal values at P4 and PI, P5 are derived from the input and output of register 21a and the respective outputs of registers 21c, 21(1).

These output values are added in first adding means formed by adders 22 and 23, respectively. This added value and the output value of the register 21c representing the central sample point P8 are each multiplied by an appropriate coefficient by the coefficient units 24-26. The output values of the coefficient multipliers 24 to 26 are added by an adder 27 forming a second adding means. Then, the added output value of the adder 26 is sent out as the detection power Do.

Here, the coefficient to be multiplied by the coefficient multipliers 24 to 26 is Kl to 1
(Defined as 8, and when the coefficient of A or B of the vestment is selected, the frequency fs of the sampling clock pulse is
When is set to 4 times the color subcarrier frequency fsc, the coefficient is 1
~When KB is A, the characteristic shown in Fig. 3 (A) is obtained, and when the coefficient Kl - KB is B, the passage characteristic L shown in Fig. 3 (B) is obtained.
is obtained. This focuses on the color subcarrier frequency 1+fsc and below to form a low-frequency transducer with characteristics that block the color signal component. Therefore, the detection power DO removes the color signal component. The luminance difference signal value and the f value accumulated for each sampling point P, ~P are obtained,
This indicates the smallest information of the image, and the noise component in the luminance difference 1g is removed by the integral action of accumulation, thereby preventing false detection due to sudden noise.

In FIG. 2, delay elements such as ultrasonic delay lines and CCDs may be used in place of the registers 21a to 21d. The number and interval of each sampling point Pl=PsO may be determined according to the maximum moving image area of the screen. It is also optional to configure the entire thing with analog circuits,
It is also possible to change the coefficients depending on the desired characteristics.

In addition, although the embodiment has been explained using an example of 5 sample points, since a lot of information is concentrated at the center point as a motion 4'+'J report in this type of video information,
Practically sufficient results can be obtained by taking up to about 7 sample points.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an example of use of the present invention, FIG. 2 is a block diagram showing an example circuit of the present invention, and FIG. 3 is a diagram showing pass characteristics. 21a to 21d...Register, 22, 23, 27
・Conflict... Adder, 24-2611... Coefficient unit, ΔCd
...Composite difference signal, P1 to P6 ...Sampling point, 21a, 21b ...ψ・Delay means, 22゜23
. . . as the first addition means, 27 . . . the second addition means. Patent applicant: NEC Home Electronics Co., Ltd. Agent: Masaki Yamakawa (and one other person) Figure 1

Claims (1)

[Scope of Claims] An apparatus for detecting image motion information when converting an interlaced scanning composite video signal and a progressive scanning video signal, the apparatus comprising: detecting the difference between frames in the interlaced scanning composite video signal; a delay unit for extracting the central composite difference signal value at odd number of adjacent sampling points on one scanning line of the screen by supplying the composite difference signal indicating the same in one scanning line unit; A mutually symmetrical position U on the left and right with respect to the central composite difference signal value
a first addition means for extracting composite difference signal values and adding them; and a low-frequency F wave having a characteristic of blocking color signal components with respect to the output value of the first addition means and the output value of the delay means. a plurality of coefficient multipliers for multiplying each coefficient by a coefficient to form a vector, and a second addition means for adding up the output value of the coefficient multiplier and extracting the added value as motion information of the image. Featured image motion information detection device.