JP2580555B2 - 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 regard to high-definition broadcasting, and development of image receiving devices for receiving the broadcasts 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.

The control signal separating circuit 2 separates the motion vector signals of bit numbers 2 to 8 of the control signal shown in FIG. 2 included in the MUSE signal, and outputs them to the motion detecting circuit 3 and the still image area processing circuit 4. Still image area processing circuit 4
If the horizontal motion vector and the vertical motion vector of the motion vector signal have values, the respective values are arithmetically processed to obtain an adjustment value, the address of the frame memory is adjusted by the same adjustment value, and one frame before the current image is adjusted. The position of the image data is moved and superimposed, interpolated between frames, and input to the mixing circuit 7. The motion detection circuit 3 corrects the motion detection signal based on the input motion vector signal and mixes the motion detection signals. The correction signal is input to the circuit 7, and the signal from the still image area processing circuit 4 is output from the mixing circuit 7.

[0004]

Therefore, the values of the horizontal motion vector and the vertical motion vector are arithmetically processed to obtain an adjustment value, and the address of the frame memory is adjusted by the same adjustment value, so that the current image is shifted one frame before. Performs complicated processing of interpolating frames by moving the position of image data and superimposing them, which increases the circuit scale and circuit cost, but converts the MUSE signal to a small display for Hi-Vision or the current TV In such a case, there is a problem that the effect is not improved even if the complicated interpolation processing as described above is performed. The present invention reduces the circuit scale and simplifies the circuit by restoring the video signal by outputting the signal from the moving image area processing circuit 5 from the mixing circuit 7 if the motion vector has a value. An object is to reduce circuit cost.

[0005]

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 still image processing circuit 4 The control signal separation circuit 2 detects the motion vector signals of bit numbers 2 to 8 contained in the control signal of the MUSE signal, and outputs the value as the same motion vector signal. If there is, the detection signal is Input to the mixing circuit 7, the correction circuit 6 corrects and outputs the plurality of stages of motion detection signals, and inputs the corrected signal to the mixing circuit 7. Based on the input, the input from the moving image processing circuit 5 is output from the mixing circuit 7. To restore the video signal.

[0006]

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 of converting and projecting a signal, since high definition is not required unlike the case of reproducing a Hi-Vision signal on a large display, the values of the horizontal motion vector and the vertical motion vector are arithmetically processed to obtain adjustment values, and the current image is obtained. If the motion vector has a value instead of performing a complicated process of moving the position of the image data one frame before by the adjustment value and superimposing and interpolating between frames, if the motion vector has a value, the interpolation is performed by the field circuit. Even if the video signal is restored by outputting the signal from the moving image area processing circuit 5, it is possible to obtain substantially the same image quality. Because, to simplify the circuit to reduce the circuit scale can be reduced circuit cost.

[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 shown in the patent application filed on Dec. 28, 1990 by the present applicant, for example, the motion detection circuit 3
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 the correction may be performed by detecting the motion in 16 steps as shown in the conventional example. The signal may be input to the circuit 6. In the case where a MUSE signal is converted and projected on a small display or an existing television, the former method is desirable because the circuit scale can be reduced to simplify the circuit and reduce the circuit cost.

The correction circuit 6 inputs the motion detection signals of the plurality of stages input from the motion detection circuit 3 to the mixing circuit 7 as they are, and based on the input, inputs from the moving picture processing circuit 5 and the still picture processing circuit 4. The output is mixed with the input. 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 vector signal is included in the bit numbers 2 to 8 in the 32-bit control signal. 2 to 5 represent horizontal motion vector signals, and 6 to 8 represent vertical motion vector signals. In the control signal separation circuit 2, the MUS shown in FIG.
A motion vector signal of bit numbers 2 to 8 included in the control signal of the E signal is detected. If the motion vector signal has a value, the control signal separation circuit 2 detects the motion vector signal and corrects the motion vector signal. 6, the correction circuit 6 corrects and outputs the motion detection signal of the plurality of stages, and outputs the corrected signal.
, And the input from the moving picture processing circuit 5 is output from the mixing circuit 7 to restore the video signal.

[0009]

As described above, according to the present invention,
Small display for HDTV and current TV
In the case where a USE signal is converted and displayed, for example, when a motion vector has a value, instead of performing a complicated process of interpolating between frames by moving the position of image data one frame before the current image and superimposing the data, Even if the video signal is restored by outputting the signal from the moving image area processing circuit interpolated in the field from the mixing circuit, almost the same image quality can be obtained, and the circuit scale can be reduced. Thus, the circuit can be simplified, and a motion adaptive interpolation circuit with low circuit cost 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 image processing circuit 5 Moving image processing circuit 6 Correction 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 Of the MUSE signal in the control signal separating circuit.
The motion vector signal is detected, and if the motion vector signal has a value, a detection signal is input to the correction circuit, and the correction circuit corrects and outputs the motion detection signal of the plurality of stages and is input to the mixing circuit. A motion adaptive interpolation circuit, wherein an input from a moving image processing circuit is output from the mixing circuit based on the input.