JPH0846992A - Motion adaptive 3D signal processor - Google Patents

Abstract

(57) [Abstract] [Purpose] By making the data rates of the output signals of the three-dimensional signal processing unit the same, the motion adaptive detection circuit can be shared.
The objective is to downsize the equipment and reduce the system cost. According to the present invention, a three-dimensional signal processing unit 4, a two-dimensional signal processing unit 3, a motion detection unit 5, a luminance mixer unit, and a color mixer unit that output an NTSC composite signal and a reproduction signal as the same signal level. It consists of 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video signal processing device used in VTRs, TVs, etc., and particularly motion adaptation 3
The present invention relates to a motion adaptive three-dimensional signal processing device that performs dimension Y / C separation and motion adaptive three-dimensional noise reduction.

[0002]

2. Description of the Related Art In recent years, products using a motion adaptive type Y / C separation circuit and a noise reduction circuit have been developed in order to improve the image quality of VTRs and TVs. This circuit is for Y of NTSC composite signal to improve the recording quality of TV broadcasting.
There is an example in which the circuit used for / C separation is shared as a noise reduction circuit during VTR reproduction.

A case of performing conventional three-dimensional Y / C separation and noise reduction (hereinafter referred to as NR) will be described below with reference to the block diagrams showing the basic configurations of FIGS. 4, 5 and 6.

First, the operation of Y / C separation during a moving image will be described. 4, the NTSC composite signal (Y / C signal) is input to the two-dimensional signal processing unit 50 via the terminal 58. This signal is input to the two-dimensional signal processing unit 5 as shown in FIG.
A two-dimensional Y / C separation circuit 40, which constitutes a part of 0, separates and outputs a color signal and a luminance signal.

The two-dimensional Y / C separation circuit 40 allows the two-dimensional Y
The color signal and the luminance signal separated by / C are input to the terminal 1 via the switches 42 and 43 which are set in the YC mode in advance.
2, and outputs to the color mixer unit 54 and the luminance mixer unit 55 shown in FIG. 4 via the terminal 13.

Next, the operation of Y / C separation during a still image will be described. NTSC composite signal is sent through terminal 58 to 3
It is input to the dimensional signal processing unit 51. Three-dimensional signal processing unit 5
1 is a part of the configuration similar to the two-dimensional signal processing unit 50.
A three-dimensional Y / C separation circuit is built in, and by this three-dimensional Y / C separation circuit, as a luminance signal of a 2-frame difference of an NTSC composite signal, to the motion detection unit 52 via a terminal 62,
In addition, the color signals of the two-frame difference of the NTSC composite signal are output to the motion detector 52 via the terminal 63.

The luminance signal obtained through the terminal 62 is a luminance motion detector for Y / C separation 70 and an interpolator 7 shown in FIG.
4, the one-frame difference signal fsc (3.58 MHz) of the low frequency component of the luminance signal of the NTSC composite signal
Is converted into a signal indicating the movement of 4 fsc (14.3 MHz) and output to the terminal YC1.

The color signal obtained through one terminal 63 is
The Y / C-separated color motion detector 71 and the interpolator 75, which form a part of the motion detection unit 52, are used to generate a 1-frame differential signal 2fsc (7.16M) in the color band of the NTSC composite signal.
(Hz) is converted into a signal representing the movement of 4 fsc (14.3 MHz) and output to YC2.

The luminance signal and the color signal inputted through the terminals YC1 and YC2 are inputted to the luminance mixer section 55 and the color mixer by the switches 57 and 56 which are set in the YC mode in advance as shown in FIG. It is output to the unit 54.
In the luminance mixer section 55, the luminance signal obtained by the two-dimensional Y / C separation and the luminance signal obtained by the three-dimensional Y / C separation are obtained through the switch 57 by the signal indicating the movement of 4 fsc (14.3 MHz), and , In the color mixer 54, a two-dimensional Y /
The 4 fsc (14.3 MH) obtained through the switch 56 for the C-separated color signal and the three-dimensional Y / C-separated color signal.
The signals representing the movement of z) are mixed and output.

Next, this circuit is used for N during VTR reproduction.
A case where the circuit is used as an R circuit will be described. First, the reproduction luminance signal (Y signal) is transferred to the terminal 5 via the terminal 58.
The reproduced color signal (C signal) is input to the two-dimensional signal processing unit 50 and the three-dimensional signal processing unit 51 via the reference numeral 9.

The reproduction color signal and reproduction luminance signal input to the two-dimensional signal processing unit 50 are the two-dimensional signal processing unit 50 shown in FIG.
The two-dimensional NR circuit 41, which constitutes a part of the above, obtains an NR reproduced color signal and reproduced luminance signal. This signal is output from the terminals 12 and 13 to the color mixer section and the luminance mixer section via the switches 42 and 43 which are set in advance in the NR mode.

On the other hand, the reproduction color signal and the reproduction luminance signal input to the three-dimensional signal processing unit 51 are NR-reproduced by the NR circuit forming a part of the three-dimensional signal processing unit 51 shown in FIG. As a one-frame difference of the reproduction color signal, the terminal 63
Is output to the motion detection unit 53 via the. Further, the reproduction luminance signal is 1 of the reproduction luminance signal NRed by the NR circuit.
The frame difference is output to the motion detector 53 via the terminal 62.

Of the signals input to the motion detector 53 shown in FIG. 6, one of the reproduced luminance signals input via the terminal 62.
The frame difference is 455 fH (7.16 MHz) obtained from the three-dimensional signal processing unit 51 by the NR-time luminance motion detector 72 and the interpolator 76 which form a part of the motion detecting unit 53.
1 frame difference signal of the reproduction luminance signal of 910 fH (1
(4.3 MHz), which is converted to a signal indicating the movement, and output to the terminal NR1.

The one-frame difference of the reproduced color signal input via the terminal 63 among the signals input to the motion detection section 53 is the NR-time color motion detector 73 forming a part of the motion detection section 53. Of the reproduced color signal of 910 / 4fH (3.58 MHz) obtained by the three-dimensional signal processing unit 51.
The frame difference signal is converted to 910 / 4fH (3.58MH
It is converted to a signal indicating the movement of z) and output to NR2.

The reproduction color signal and the reproduction luminance signal inputted through the terminals NR1 and NR2 are set in advance in the NR mode as shown in FIG.
The color mixer 54. Output to the brightness mixer section 55. The NR reproduced color signal and reproduced luminance signal are moved by the color mixer section 54 and the luminance mixer section 55 in the same manner as described in the Y / C separation. The signals from the detectors 52 and 53 are mixed and output.

As described above in detail, in the case of the conventional example, the data rate of the input signal of the motion detector differs depending on the mode.
It was difficult to share a motion detector, and each mode had its own motion detector. By the way, since this method has a dedicated motion detector for each mode, when one mode is used, one motion detector is used and the other motion detector is not used, resulting in poor circuit utilization efficiency. This has caused an increase in circuit scale, which has been a factor in increasing system cost.

[0017]

As described above, in the conventional motion adaptive 3D signal processing apparatus, the difference in the data rate of the signal for detecting the motion during the motion adaptive 3D Y / C separation and the motion adaptive 3D NR. Therefore, the motion detector dedicated to the motion adaptive 3D Y / C separation and the motion detector dedicated to the motion adaptive 3D NR are separately used, which causes an increase in the circuit scale.
For that reason, it was a factor of increasing the system cost. Therefore, according to the present invention, by making the data rate of the input signal of the luminance motion detector equal to the data rate of the chrominance motion detector, it is possible to reduce the circuit scale and system cost.
An object is to provide a dimensional signal processing device.

[0018]

As described above, this apparatus uses the chrominance signal and luminance signal of the input NTSC signal, and NR.
The three-dimensional signal processing unit that makes the color signal and the luminance signal of the VTR reproduction signal having the same data rate and the signal of the circuit Y
A / C separation mode and NR mode can be freely used, and a common motion detection section, a two-dimensional signal processing section for separating two-dimensional Y / C of the NTSC signal, and the three-dimensional signal processing In the motion adaptive three-dimensional signal processing device, the mixer for mixing the signal of the two-dimensional signal processing unit, the signal of the two-dimensional signal processing unit, and the signal of the motion adaptive detection unit is provided. Set the data rate of the detector input signal to Y /
The same motion detector can be used in both the Y / C separation mode and the NR mode by making the C separation and the NR the same.

[0019]

With the above means, the luminance motion is detected at the time of Y / C separation, so that the low-frequency component of one frame difference of the NTSC signal is detected at the luminance motion of 4 fsc (14.3 MHz). Input into the vessel. In addition, in order to obtain color movement, the difference between two frames of the NTSC signal is 1 /
Subsample to 2 and input to the color motion detector at a data rate of 2 fsc (7.16 MHz). On the other hand, in order to obtain the luminance movement at the time of NR, the low-frequency component of the one-frame difference of the input luminance signal is input to the luminance motion detector at a data rate of 910 fH (14.3 MHz). Further, in order to obtain color movement, one-frame difference of the signal obtained by demodulating the input carrier color signal is subsampled to 455 fH
Input to the color motion detector at a data rate of (7.16 MHz). If the data rates of the input signals of the respective motion detectors at the time of Y / C separation and at the time of NR are made the same, Y /
Since the circuit can be shared between the C separation and the NR, it is easy to downsize the device and reduce the system cost.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described in detail below with reference to FIGS. FIG. 1 is a block diagram of a motion adaptive three-dimensional signal processing device according to the present invention.

First, the operation at the time of a moving image at the time of Y / C separation will be described. The 4 fsc (14.3 MHz) rate NTSC composite signal (Y / C signal) input from the terminal 2 is input to the two-dimensional signal processing unit 3. The two-dimensional signal processing unit 3 has a two-dimensional Y / C separation circuit and a two-dimensional NR as described in the conventional example.
It consists of a circuit. Also in the present invention, similarly, a luminance signal and a chrominance signal obtained by two-dimensional Y / C separation are obtained.

Next, a still image will be described. First 4fs
The NTSC composite signal of c (14.3 MHz) rate is input to the three-dimensional signal processing unit 4. 3 shown in FIG.
The dimensional signal processing unit 4 is a detailed block diagram according to the present invention. In this figure, the switches 32, 33 and 3 are used when Y / C separation is performed.
4, 35 and 36 are set in the YC mode.

First, the NTSC input via the terminal 2
The composite signal is delayed by one frame in the frame memory 22 and added to the adder 21. The adder 21 adds the signal input via the terminal 2 and the signal delayed by one frame in the frame memory 22 to obtain 4 fsc (14.3 MH).
z) A signal for one frame rate is output. This signal is output to the terminal 14 via the switch 33 as a luminance signal which is three-dimensionally Y / C separated.

Further, the subtractor 37 subtracts the signal input through the terminal 2 from the signal delayed by one frame in the frame memory 22 to obtain 1 at 4 fsc (14.3 MHz) rate.
Output the frame difference signal. This output signal is output to the terminal 1 as a three-dimensional Y / C separated color signal via the switch 36.
2, and a luminance motion detector 18 that forms a part of the motion detector 5 shown in FIG.
It is also output as a signal for detecting the luminance movement.

The luminance motion detector 18 uses a 4 fsc (14.
The 1-frame differential signal of the NTSC composite signal of 3 MHz) rate is converted into a signal showing the luminance movement of 4 fsc (14.3 MHz) rate and output to the terminal 16.

On the other hand, the NTSC composite signal is delayed by one frame in the frame memory 22 shown in FIG.
It is subsampled to two rates. This signal is further output to the subtractor 28 via the switch 35 as a signal delayed by one frame in the frame memory 27.

One of the NTSC composite signals is input to the sub sampling circuit 26 via the switch 34,
This signal is sub-sampled at a rate of 1/2 so as to obtain data on both color difference axes. This signal is input to the subtractor 28, and the subtractor 28 subtracts the signals subsampled to the 1/2 rate from each other and outputs the 2-frame difference signal at the 2fsc (7.16 MHz) rate via the terminal 11. It is output to the color motion detector 19 which constitutes a part of the motion detector shown in FIG. Color motion detector 19 and interpolator 20 are 2 fsc
2f of 2-frame differential signal of (7.16 MHz) rate
The signal is converted into a signal representing the color movement at the sc (7.16 MHz) rate and output to the terminal 17.

By the way, the carrier color signal is a quadrature-phase-modulated color difference signal of two axes, and its base band has an I axis of 1.5 MHz and a Q axis of 0.5 MHz.
According to the sampling theorem, I / Q axis data can be reproduced by sampling at a sampling frequency of 3 MHz or more per axis. Therefore, in order to obtain color movement, 4 fsc (14.
3MHz) NTSC composite signal at 1/2
It is proved that there is no performance problem when sub-sampled.

That is, in this embodiment, the NTSC composite signal is sampled at a rate of 4 fsc (14.3 MHz) in advance and is sub-sampled at a rate of ½ so as to obtain data on both color difference axes. That is, the color difference is sampled at fsc (3.58 MHz) per one axis, which satisfies the sampling theorem.

A signal indicating the degree of luminance motion is output to the luminance mixer section 6 via the output signal terminal 16 of the motion detector 5 shown in FIG. The luminance mixer unit 6 is a two-dimensional Y / C input via the two-dimensional signal processing unit 3 and a terminal 12.
The separated luminance signal and the three-dimensional Y / C separated luminance signal input through the three-dimensional signal processing unit and the terminal 14 are mixed by a signal indicating the degree of motion input through the terminal 16 and the terminal 9 Output to.

A signal representing the degree of color movement is output to the color mixer section 7 via the terminal 17. Color mixer section 7
Is a two-dimensional Y / C separated color signal inputted through the two-dimensional signal processing unit 3 and the terminal 13 and a three-dimensional Y / C separated color signal inputted through the three-dimensional signal processing unit 4 and a terminal 15. The color signal is mixed with a signal indicating the degree of color movement input through the terminal 17, and the mixed signal is output to the terminal 8.

Next, the three-dimensional NR processing during VTR reproduction will be described. In this mode, 910 fH (14.3 MH)
z) rate reproduction luminance signal from terminal 2 is 910 fH
A reproduction color signal having a rate of (14.3 MHz) is input from the terminal 1. At the time of moving image, a two-dimensional NR circuit is used to obtain a two-dimensional NR luminance signal and a color signal, respectively, as described in the conventional example.

Here, at the time of NR, the switches 32, 33, 3
4, 35 and 36 are set to the NR mode state, respectively. 910 fH (14.3 MH) input during still image
The reproduction luminance signal of the z) rate is delayed by the frame memory 22. The subtractor 20 subtracts the input luminance signal and the reproduction luminance signal delayed by one frame to obtain 910 fH (14.3 MH).
z) Output a 1-frame differential signal at the rate. This output signal is output to the luminance motion detector 18 via the terminal 10.

Further, the NR circuit 24 generates a reproduction luminance signal which is NRed by the reproduction luminance signal and the reproduction luminance signal delayed by one frame in the frame memory 22, and is three-dimensionally NR reproduced through the switch 33 as a reproduction luminance signal terminal. Output to 14.

910fH (1 input from terminal 1
The reproduced color signal of 4.3 MHz rate is demodulated into a color difference signal by the decoder 25 and input to the sub-sampling circuit 26 via the switch 34.

This signal is sub-sampled at a rate of 455 fH which is 1/2 so as to obtain data on both color difference axes, and is further delayed by one frame in the frame memory 27. Here, the band of the reproduction color signal is fsc ± 500 KHz, and subsampling to 1/2 rate does not affect the performance. The reason is Y.
The reason is the same as that described at the time of C separation.

When the signal delayed by one frame in the frame memory 27 is input to the subtractor 28, the current color difference signal is input to the other input terminal of the subtractor 28, and the subtractor 28 is halved. Subsampled signals are subtracted from each other, and a one-frame difference signal having a color difference of 455 fH (7.16 MHz) is output to the color motion detector 19 via the terminal 11.

The NR circuit 30 uses the signal sub-sampled by the sub-sampling circuit 26 and the signal delayed by one frame by the frame memory 27 to generate N signals.
An R reproduced color signal is generated. This reproduction color signal is modulated by the encoder 31 to a color subcarrier frequency and 910 fH (1
The carrier color signal is three-dimensionally NRed at a rate (4.3 MHz), and then output to the terminal 15 via the switch 36. The 1-frame difference of the reproduction luminance signal input through the terminal 10 shown in FIG. 2 is converted by the luminance motion detector 18 forming a part of the motion detecting section 5 into a 1-frame difference signal of the luminance signal representing the luminance movement. It is converted to and output through the terminal 16.

A one-frame difference of the reproduced color signal input via the terminal 11 is converted into a signal representing a color motion by the color motion detector forming a part of the motion detection unit 5, and the interpolator 20 converts the signal into 910 fH. The signal is converted into a signal representing color movement at a rate of (14.3 MHz) and is output via the terminal 17.

Further, the luminance mixer section 6 detects the motion of the reproduced luminance signal which is two-dimensionally NRed by the two-dimensional signal processing section 3 and the reproduced luminance signal which is three-dimensionally NRed by the three-dimensional signal processing section 4 via a terminal 16. 5, the color mixer unit 7 uses the signal representing the movement of the luminance, and the color mixer unit 7 performs a two-dimensional NR reproduction color signal by the two-dimensional signal processing unit 3 and the three-dimensional NR color signal by the three-dimensional signal processing unit 4. And are mixed by the signal representing the movement of the color inputted from the movement detecting section 5 via the terminal 17, and are output to the terminals 9 and 8, respectively.

As described in detail above, in this embodiment, the input of the luminance motion detector 18 is set to the signal to obtain the luminance movement of the same data rate at the time of 3D Y / C separation and 3D NR. On behalf of.

Further, since the input of the color motion detector 19 is replaced with a signal for obtaining color motion of the same data rate at the time of 3D Y / C separation and 3D NR, motion detection is performed in each mode. Since it is not necessary to provide the device corresponding to the above, the circuit can be shared, and the system cost can be reduced and the size can be reduced.

[0043]

As described in detail above, according to the present invention,
It is easy to share the motion detection circuit for Y / C separation and NR, and by sharing the circuit in both modes, the cost of motion adaptive 3D Y / C separation and motion adaptive 3D NR can be reduced. Can be achieved.

[Brief description of drawings]

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

FIG. 2 is an internal block diagram of a motion detector according to the present invention.

FIG. 3 is a detailed block diagram of a three-dimensional signal processing unit according to the present invention.

FIG. 4 is a block diagram showing a conventional motion adaptive three-dimensional signal processing device.

FIG. 5 is a block diagram of a two-dimensional signal processing unit according to the related art and the present invention.

FIG. 6 is a detailed block diagram of a motion detection unit according to a conventional example.

[Explanation of symbols]

3 ... 2D signal processing unit, 4 ... 3D signal processing unit, 5
...... Motion detector 6 …… Luminance mixer, 7 …… Color mixer

Claims (2)

[Claims] 1. A two-dimensional signal processing unit for two-dimensionally processing an input NTSC composite signal or VTR reproduction signal, and a luminance signal level and V of the NTSC composite signal.
A three-dimensional signal processing unit for outputting the level of the TR reproduced luminance signal or the color signal of the NTSC composite signal and the level of the VTR reproduced color signal to the motion detector at the same data rate at the time of output; A motion detection unit adapted to any of an NTSC composite signal or a VTR reproduction signal from the processing unit, and a luminance signal or VT of the NTSC composite signal.
Detecting the movement of the luminance of the output signal of the two-dimensional signal processing unit that outputs a two-dimensional signal and the output signal of the three-dimensional signal processing unit that outputs a three-dimensional signal by adapting to any of the luminance signals of the R reproduction signal A luminance mixer unit that mixes according to the output signal of the motion detector unit, and a color signal of the NTSC composite signal or a VTR
Detecting the color movement of the output signal of the two-dimensional signal processing unit that outputs the two-dimensional signal and the output signal of the three-dimensional signal processing unit that outputs the three-dimensional signal in accordance with any of the color signals of the reproduction signal. A motion adaptive three-dimensional signal processing device comprising: a color mixer unit that mixes with an output signal of a motion detecting unit. 2. In the motion adaptive three-dimensional signal processing device, the three-dimensional signal processing unit, when outputting an NTSC composite signal and a VTR reproduction signal, has a decoder and a plurality of sub-samplings to make the data rate the same. A circuit, a plurality of frame memories, a plurality of noise reduction circuits, a plurality of subtractors, an adder, an encoder, and a plurality of switches respectively corresponding to the YC mode and the NR mode. The motion adaptive three-dimensional signal processing device according to claim 1.