JP2580554B2 - Motion adaptive interpolation circuit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a MUSE signal receiving apparatus, and more particularly to a motion adaptive interpolation circuit for restoring a video signal by interpolating data into image data of a sampled and transmitted MUSE signal. At present, experimental broadcasting is being conducted with respect to high-definition broadcasting, and the development of image receiving devices for receiving this broadcasting is underway. However, there is a need to develop cheap and high-performance devices.

[0002]

2. Description of the Related Art In a conventional apparatus for receiving a MUSE signal, as shown in FIG. 3, a MUSE signal converted into a digital signal and extracted is converted into a still image area processing circuit 4, a moving image area processing circuit 5, and a MUSE signal. Are input to a control signal separation circuit 2 for separating the control signals included in the image data and a motion detection circuit 3 for detecting the motion area. The still image area processing circuit 4 performs the interpolating of the pixel data between frames. The moving image area processing circuit 5 outputs the pixel data by performing field interpolation on the pixel data, and inputs the pixel data to the mixing circuit 7.
The motion detection circuit 3 detects a motion area from the input MUSE signal and inputs the detection signal to the mixing circuit 7. Based on the detection signal, the mixing circuit 7 outputs the output of the still image area processing circuit 4 and the moving image area. The output of the processing circuit 5 is mixed in 16 steps to restore the video signal.

[0003]

When a simple circuit using a one-frame memory is used as the motion detecting circuit 3, the MUSE signal samples and transmits image data, so that the pixel one frame before and the current frame are used. Pixels have different sampling points, and it has been difficult to perform accurate motion detection for details of an image. Therefore, there is a case where a still image is determined to be a moving image and image data processing is performed, and there is a problem that image blurring or blurring occurs, thereby deteriorating reproduction image quality. The present invention detects the complete still image or quasi-still image information of the motion information included in the control signal of the MUSE signal, and outputs the signal from the still image region processing circuit 4 from the mixing circuit 7 by the detection signal. An object of the present invention is to restore the video signal so that the image signal is output, thereby preventing image blurring and blurring, and improving the quality of reproduced image quality.

[0004]

FIG. 1 is an electric circuit block diagram of a motion adaptive interpolation circuit according to an embodiment of the present invention. As shown in FIG.
The input circuit for the USE signal is branched, and the first
To the control signal separating circuit 2, the second branched to the motion detecting circuit 3, the third branched to the still image processing circuit 4, and the fourth branched to the moving image processing circuit 5, The moving image processing circuit 5 interpolates the field and outputs it and inputs it to the mixing circuit 7. The still image processing circuit 4 interpolates and outputs the frame and outputs it to the mixing circuit 7. Is detected as a plurality of stages of motion detection signals and input to the mixing circuit 7 via the correction circuit 6, and based on the input, the input from the moving image processing circuit 5 and the The control signal separating circuit 2 detects the motion information of the bit numbers 16 to 18 included in the control signal of the MUSE signal, and outputs the motion information as a complete still image. Alternatively, if it is quasi-still image information, the detection signal The video signal is restored by inputting the signal from the still image processing circuit 4 to the mixing circuit 7 by inputting the signal to the correct circuit 6 and correcting the motion detection signal at the plurality of stages by the correction circuit 6. I am trying to do it.

[0005]

According to the present invention, a video signal is restored by interpolating data into image data of a sampled and transmitted MUSE signal by the above-described configuration. In the case where a signal is converted and projected, a high-definition is not required unlike the case where a Hi-Vision signal is reproduced on a large display. For example, a simplified motion detection circuit 3 using a one-frame memory by simplifying the circuit is used. In this case, since the sampling point is different between the pixel of the previous frame and the pixel of the current frame, a still image may be determined as a moving image and a detection signal may be output from the motion detection circuit 3. The motion information of the bit numbers 16 to 18 included in the control signal of the MUSE signal as shown in FIG. By correcting the detection signal from the circuit 3 out, so as to control the mixing circuit 7.

If the motion information indicates the degree of motion of 3 to 7, the mixing circuit 7 inputs the input from the moving picture processing circuit 5 and the still picture processing circuit based on the motion detection signals of a plurality of stages detected by the motion detecting circuit 3. When the motion information indicates a complete still image of 1 or 2 or a quasi-still image, the detection signal from the motion detection circuit 3 is corrected and the still image processing is performed. The input from the circuit 4 is output from the mixing circuit 7 to restore the video signal. Image blurring or blurring caused by performing image data processing by determining a still image as a moving image is performed. To prevent
The quality of the reproduction image can be improved.

[0007]

1 is an electric circuit block diagram of a motion-adaptive interpolation circuit showing one embodiment of the present invention. Reference numeral 1 denotes an input terminal, which is a digital signal input through the input terminal 1. The converted MUSE signal is branched, the first branched signal is sent to the control signal separating circuit 2, the second branched signal is sent to the motion detecting circuit 3, and the third branched signal is sent to the still image processing circuit 4.
The fourth branch is input to the moving image processing circuit 5. The moving image processing circuit 5 interpolates and outputs pixel data to the input luminance signal of the MUSE signal and inputs it to the mixing circuit 7. The still image processing circuit 4 outputs the luminance signal of the input MUSE signal. , Pixel data is interpolated between frames and output, and input to the mixing circuit 7. As the motion detection circuit 3, for example, as shown in a patent application filed on Dec. 28, 1990 by the present applicant, a simple motion detection circuit 3 using one frame memory is used and input. With respect to the luminance signal of the MUSE signal, the motion of the pixel data may be detected as a five-step motion detection signal from 0 to 4 and input to the correction circuit 6, or as shown in the conventional example. Alternatively, the motion detection signal may be detected as a 16-step motion detection signal and input to the correction circuit 6.

MUS for small displays and current televisions
In the case where the E signal is converted and projected, for example, the former method is desirable because the circuit scale can be reduced, the circuit can be simplified, and the circuit cost can be reduced. FIG. 2 is an explanatory diagram of the control content of the control signal included in the MUSE signal. As shown in FIG. 2, the motion information is included in the 16 to 18 bit numbers in the 32-bit control signal, 0 indicates normal, 1 indicates a complete still image, 2 indicates a quasi-still image, and 3 to 7 indicate the degree of movement. The control signal separation circuit 2 detects the motion information of the bit numbers 16 to 18 included in the control signal of the MUSE signal shown in FIG. 2 and inputs the detection signal to the correction circuit 6. Are 3 to 7, the motion detection signal of a plurality of stages is output as it is from the correction circuit 6 and input to the mixing circuit 7, and based on the motion detection signal of the plurality of stages, The input and the input from the still image processing circuit 4 are mixed and output. When the motion information detected by the control signal separation circuit 2 is a complete still image of 1 or a quasi-still image of 2, the correction circuit 6 corrects the multi-stage motion detection signal input from the motion detection circuit 3. Then, the video signal is restored by inputting the same from the still image processing circuit 4 to the mixing circuit 7.

[0009]

As described above, according to the present invention,
Even when a simple circuit is used as the motion detection circuit, or when a still image is erroneously detected as a moving image by the motion detection circuit, the motion information included in the control signal of the MUSE signal is detected. When the motion information is a complete still image,
Alternatively, in the case of a quasi-still image, by using a video signal for restoring the output of the still image processing circuit performing the frame interpolation processing, it is possible to reproduce clear image quality even to an image without blurring or blurred details. A motion adaptive interpolation circuit can be provided.

[Brief description of the drawings]

FIG. 1 is an electric circuit block diagram of a motion adaptive interpolation circuit according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of control contents of a control signal included in a MUSE signal.

FIG. 3 is a block diagram of an electric circuit of a main part of a conventional MUSE decoder.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Input terminal 2 Control signal separation circuit 3 Motion detection circuit 4 Still picture processing circuit 5 Moving picture processing circuit 6 Motion compensation circuit 7 Mixing circuit 8 Output terminal

Claims (1)

(57) [Claims] 1. An input circuit for a MUSE signal converted into a digital signal is branched, a first branch is divided into a control signal separation circuit, a second branch is divided into a motion detection circuit, and a second branch is divided into a motion detection circuit. The third is a still image processing circuit,
Is input to the moving image processing circuit, and the moving image processing circuit interpolates the field and outputs the input signal to the mixing circuit.The still image processing circuit interpolates the frame and outputs the input signal to the mixing circuit. The motion of the pixel data is detected as a multi-stage motion detection signal and input to the mixing circuit through a correction circuit, and based on the input, the input from the moving image processing circuit and the still image processing circuit The control signal separation circuit detects the motion information of the bit numbers 16 to 18 included in the control signal of the MUSE signal, and detects the motion information as a complete still image or an If it is still image information, the same detection signal is input to the correction circuit, the correction circuit corrects and outputs the multi-stage motion detection signal input from the motion detection circuit, and is input to the mixing circuit. , Same input Motion adaptive interpolation circuit, characterized in that allowed to output the input from the still image processing circuit from said mixing circuit based.