JPH0834583B2 - Multiple subsampled signal regenerator - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video signal reproducing apparatus for subsampling and transmitting a video signal for the purpose of transmission band compression, and for performing various interpolation processing and reproduction of the video signal according to the moving area of the video signal. Is.

[0002]

BACKGROUND OF THE INVENTION between fields in a method of bandwidth compression of video signals, and there are multiple subsampling transmission system which uses an offset subsampling between frames. This system is, for example, MUSE (Multip), which is the current high- definition television signal multiplex sub-sample transmission system.
le Sub-Ny quist Sampling E
ncoding) system, and band compression is effectively realized.

In this multi-subsample transmission method, a motion area is detected from the information of the field of interest and the information of several fields that have arrived before the field of interest, and the information of the field of interest and the field of interest arrive before the field of interest. and between fields than the number field of the information is, and the still picture to reproduce the video signal by performing interpolation in the inter-frame according to the motion area of the video reproducing a video signal by interpolation in the from field of interest field detected above And mixed to obtain a reproduced video signal.

FIG. 3 shows a video signal reproducing apparatus in the conventional multiple sub-sample transmission system disclosed in, for example, Japanese Patent Laid-Open No. 61-264889. In the figure, 1 is MUSE
Input terminal for inputting a MUSE signal band-compressed by the method, 2 is the analog MUS input from the input terminal 1.
An A / D conversion circuit for converting the E signal into a digital MUSE signal, 3b is a frame memory for storing one frame of the output of the A / D conversion circuit 2, and 5a is an output of the A / D conversion circuit 2 and the frame memory 3b. Interframe interpolating circuit 6a for interframe interpolating as input, interframe interpolating circuit 5a
Inter-field interpolation circuit that interpolates between fields with the output of the input as input, 7 is a field interpolation circuit that interpolates with the output of the A / D conversion circuit 2 as input, and 11 is 2 and 3
a motion detection circuit which receives the output of b as an input and detects a motion region,
Reference numeral 12 is a mixing circuit that receives the outputs of the inter-field interpolation circuit 6a, the field interpolation circuit 7 and the motion detection circuit 11 and performs mixing processing. Reference numeral 9 is a D / circuit that converts the digital signal output from the mixing circuit 12 into an analog signal. A conversion circuit, 1
Reference numeral 0 is an output terminal for outputting the signal of the D / A conversion circuit 9.

Next, the operation will be described. The MUSE signal input from the input terminal 1 is A / D converted by the A / D conversion circuit 2 and converted into a digital MUSE signal. The frame memory 3b delays the output of the A / D conversion circuit 2 by one frame and outputs it. The motion detection circuit 11 detects a motion area by calculating the difference between the output of the A / D conversion circuit 2 which is the field of interest and the output of the frame memory 3b which is a field that arrives one frame before the field of interest, and will be described later. A control signal for controlling the mixing circuit 12 is generated.
The interframe interpolation circuit 5a receives the outputs of the A / D conversion circuit 2 and the frame memory 3b as input and performs interframe interpolation processing. The inter-field interpolation circuit 6a is an inter-frame interpolation circuit 5
Inter-field interpolation processing is performed using the output of a as an input. The interframe interpolation circuit 5a and the interfield interpolation circuit 6a
By interpolation processing, between the fields, performs offset subsampling between及beauty frames, bandwidth compressed M
The still image of the USE signal is reproduced.

Next, the field interpolation circuit 7 receives the output of the A / D conversion circuit 2 as an input and performs field interpolation processing. By the interpolation processing, the moving image that changes with time is subjected to interpolation processing based on the information of one field, and the moving image is reproduced. The mixing circuit 12 receives the still image output from the inter-field interpolation circuit 6a and the moving image output from the field interpolation circuit 7, and performs mixing processing according to the control signal output from the motion detection circuit 11. As a result, a moving image is output to the detected motion area and a still image is output to the other areas. The D / A conversion circuit 9 D / A converts the output of the mixing circuit 12 and outputs an analog reproduced video signal from the output terminal 10.

[0007]

Since the conventional multiple sub-sampled signal reproducing apparatus is constructed as described above, the motion area detected by the motion detecting circuit is the motion area of the field of interest and the field before the field of interest. It is a combination with the motion area of the object, and the area behind the moving object displayed in the field of interest is the motion area of the field before the field of interest. There was a problem that it appeared as a disturbance.

The present invention has been made in order to solve the above problems, and detects a motion area of a field of interest using information for several fields that come before and after the field of interest in time. , The video signal of the moving image processing interpolated in the field is output to the motion area, and the other area is
Multiplex sub-sample signal reproduction that operates to output a video signal of still image processing interpolated between fields using the field of interest and information for several fields that are temporally before and after the field of interest The purpose is to obtain the device.

[0009]

SUMMARY OF THE INVENTION A multi-subsampled signal reproducing apparatus according to the present invention is used for inter-field and frame
Compress the transmission band using the inter-offset subsample,
Information on the field of interest and information before the field of interest
Depending on the information of several fields that have come,
Ravi and interframe interpolation processing to demodulate the video signal
Feel only by still image processing and information of the field of interest
Video processing that performs video interpolation
Information in the eye field and arrival before the attention field
Feel by correlating with the information of several fields
The difference between frames or the difference between frames is calculated to detect the motion area.
The motion detection process to be performed and the motion detection process
According to the moving area, the video signal processed by the still image and the moving image
A video signal that performs mixing processing to mix the processed video signal.
Signal in the multi-subsampled signal regenerator
Comes before and after the field information and field of interest
Difference between fields due to correlation with information for several fields
Alternatively, the inter-frame difference is calculated, and the calculated difference value is used.
A method for detecting candidates for movement areas
On the other hand, the candidates of both the moving regions that are temporally before and after
Calculate the common area and detect the moving area of the field of interest
Means and the motion region that is temporally previous to the field of interest.
By calculating the candidate area and the motion area of the field of interest
Candidates for the motion area temporally before the field of interest
And means for calculating the still region in the information field of interest, the demodulating the video signal subjected to the interpolation process between fields and between frames by the number field of the information coming arriving later than及beauty attention field 2 still image processing, and the video signal subjected to the moving image processing is output to the detected moving area of the attention field, and the first moving image is output to the still area in the moving area candidate temporally preceding the detected attention field. Two
The video signal subjected to the still image processing is output, and the normal mixing processing for outputting the video signal subjected to the still image processing is further performed in a still area other than the above.

[0010]

The multi-subsampled signal reproducing apparatus according to the present invention detects the motion area of only the field of interest by using the field of interest and the information of several fields temporally before and after the field of interest, and the detected motion is detected. outputs videos inserted in the field only in the region, the other region between the frames, and the still image with interpolation in between fields are output by the information of the number field before and after in time relative to the field of interest and field of interest . Therefore , in the field of interest
The area behind the moving image object, that is, the moving area of the field before the field of interest is subjected to still image processing,
The video signal is reproduced.

[0011]

EXAMPLES Example 1. FIG. 1 is a diagram showing an embodiment of the present invention. In the figure, 1, 2, 3b, 5a, 6a, 7,
9 and 10 are the same as the conventional example. 3a is a frame memory that receives the output of the A / D conversion circuit 2; 4 is an A / D conversion circuit 2; a motion detection circuit that receives the outputs of the frame memories 3a and 3b; 5b is an A / D conversion circuit 2; An inter-frame interpolation circuit having the output of the frame memory 3a as an input, 6b an inter-field interpolation circuit having an output of the inter-frame interpolation circuit 5b as an input, 8 a motion detection circuit 4, inter-field interpolation circuits 6a, 6b , Is a mixing circuit which receives the output of the field interpolation circuit 7 as an input.

Next, the operation will be described. The digital MUSE signal converted by the A / D conversion circuit 2 is input to the frame memory 3a. Frame memory 3
a performs the same operation as the conventional frame memory 3b, and A /
The output of the D conversion circuit 2 is delayed by one frame and then output. The motion detection circuit 4 includes an A / D conversion circuit 2, a frame memory 3
The outputs of a and 3b are input and the motion of only the field of interest is detected. Next, the motion area of only the attention field is removed from the motion area detected by the conventional method, and the motion area of the field before the attention field in the motion area detected by the conventional method is calculated. Then, a control signal corresponding to each calculated area is output to the mixing circuit 8 described later.
The configuration of this circuit may be, for example, as shown in FIG.

The motion area candidate calculation circuit 41a subtracts the output signal of the frame memory 3a which is the field of interest and the output signal of the A / D conversion circuit 2 which is the field one frame after the field of interest to obtain an inter-frame difference signal. calculate. Then, the difference signal is converted to generate a motion area signal. The motion area candidate calculation circuit 41b receives the output signal of the frame memory 3a which is the field of interest and the output signal of the frame memory 3b which is the field one frame before the field of interest, and operates in the same manner as the motion area candidate calculation circuit 41a. And a motion area candidate signal is generated.

The common area calculating circuit 42 is a moving area candidate calculating circuit 41a which is a combination of a moving field in a field of interest and a field one frame after the field of interest.
And a common area with the output of the motion area candidate calculation circuit 41b, which is a synthesis of the motion area in the field one frame before the field of interest and the field of interest, is calculated to calculate the motion area signal of the field of interest.

The control signal generating circuit 43 is the motion domain signal remarked fields to be printed from the common area calculating circuit 42 and the dynamic
As input motion area candidate signal outputted from the region candidate calculation circuit 41b can subtracts the motion area signals the motion region candidate and the noted field, calculating a motion region of only one frame previous field with respect to the target field . And
Moving area of the field of interest, the movement region of only one frame previous field, to determine the other still region, and generates a control signal for controlling the next-stage circuit.

Next, the interframe interpolation circuit 5b receives the signal output from the A / D conversion circuit 2 and the signal output from the frame memory 3a as input, and operates similarly to the interframe interpolation circuit 5a of the conventional example. , Inter-frame interpolation processing is performed. The inter-field interpolation circuit 6b receives the signal output from the inter-frame interpolation circuit 5b as an input and performs the same operation as the inter-field interpolation circuit 6a of the conventional example to perform inter-field interpolation processing.

The mixing circuit 8 outputs the output signal of the field interpolation circuit 7 to the motion area of the field of interest according to the control signal output from the motion detection circuit 4, and the field to the motion area of only the field one frame before. Interpolation circuit 6
The output signal of b is output, and the output signal of the inter-field interpolation circuit 6a is output to the other stationary areas. The D / A conversion circuit 9 converts the output signal of the mixing circuit 8 into D / A as in the conventional example.
The converted analog video signal is output from the output terminal 10.

By the above operation, the area behind the moving object which has been detected by the conventional motion detection processing and processed by the moving image, that is,
The moving area one frame before the attention field is configured to be subjected to the still image processing using the information of the attention field and several fields after the attention field. This reduces interference in the area and improves the image quality.

Example 2. In the above embodiment, in order to clarify the description of the mixing circuit, the signal is switched and output in each area.However, in the motion detection circuit, a control signal having a weight according to the detection signal is generated. In the mixing circuit, the mixing ratio of each interpolation processed signal may be controlled according to the control signal.

[0020]

As described above, according to the present invention, only the field preceding the field of interest from the composite signal of the motion field of the field of interest and the field prior to the field of interest detected by the conventional motion detection circuit. Since the moving area is calculated and the still image processing is performed using the information of the attention field and several fields after the attention field, there is an effect of reducing the deterioration of the image quality due to the movement of the area. .

[Brief description of drawings]

FIG. 1 is a block diagram showing a multiple sample signal reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a motion detection circuit of FIG.

FIG. 3 is a block diagram showing a conventional multiple sub-sampled signal reproducing device.

[Explanation of symbols]

 1 Input Terminal 2 A / D Conversion Circuit 3a, 3b Frame Memory 4 Motion Detection Circuit 5a, 5b Interframe Interpolation Circuit 6a, 6b Interfield Interpolation Circuit 7 Field Interpolation Circuit 8 Mixing Circuit 9 D / A Conversion Circuit 10 Output terminals 41a and 41b Motion area candidate calculation circuit 42 Common area calculation circuit 43 Control signal generation circuit

Claims (1)

[Claims] [Claim 1] with offset subsampling between fields and between frames to compress the transmission band, information field of interest, between fields by number field of the information that arrives before及beauty attention field and inter-frame Still image processing that performs interpolation processing and demodulates the video signal, moving image processing that performs field interpolation processing only by the information of the field of interest and demodulates the video signal, information of the field of interest , and information that comes before the field of interest. field difference and by correlation of the number field of the information and
Mixing calculates a frame difference, mixes the motion detection processing of detecting a motion area, according to the motion area detected by the detection processing-out animals, and a video signal processed video signal and said video treated the still picture in multiplexed subsampled signal reproducing apparatus of a video signal and a process, more feel a correlation between the number field of the information arriving back and forth relative information field of interest of the field of interest
Means for calculating the inter-frame difference or inter-frame difference, and detecting a motion area candidate based on the calculated difference value; and a common area for both candidates based on the motion area candidates temporally before and after the field of interest. and means for detecting a motion area of the field of interest, the temporally previous the relative more attention field operation with the motion area of the candidate and target field-out temporally previous animal with respect to the target field region and means for calculating the still region in the candidate motion area information field of interest,及beauty attention field performs inter-field and the inter-frame interpolation process by the number field of the information coming arrived after the video signal And a second still image processing for demodulating, and outputting the video signal subjected to the moving image processing to the moving region of the detected field of interest, for the detected field of interest. A mixing process for outputting the video signal subjected to the second still image processing to the still region in the temporally previous motion region candidates and outputting the normal still image processed video signal to the still regions other than the above.
An apparatus for reproducing a sub-sampled signal for a video signal, characterized in that