JPH04319890A - Motion adaptive type interpolating circuit - Google Patents

Abstract

PURPOSE:To improve the reproducing picture quality by setting a video signal for restoring a signal subjected to inter-frame interpolation, when a motion information signal contained in a control signal of an MUSE signal is a complete still picture or a semistill picture. CONSTITUTION:An input of an MUSE signal is allowed to branch, inputted to a control signal separating circuit 2, a motion detecting circuit 3, a still picture processing circuit 4 and an animated picture processing circuit 5, an output subjected to in-field interpolation by the animated picture processing circuit 5 and an output subjected to inter-frame interpolation by the still picture processing circuit 4 are inputted to a mixing circuit 7, a motion of picture element data is detected as a motion detecting signal of plural stages by the motion detecting circuit 3 and inputted to the mixing circuit 7 through a correcting circuit 6, the mixing circuit 7 mixes and outputs both the inputs, based on said input, and in the case a signal of a complete still picture or a semistill picture is detected by the control signal separating circuit 2, the above detecting signal is inputted to the correcting circuit 6 and the output is corrected, and a signal of the still picture processing circuit 4 is outputted from the mixing circuit 7.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image receiving apparatus for MUSE signals, and more particularly to a motion adaptive interpolation circuit for restoring a video signal by interpolating data into image data of a MUSE signal that is sampled and transmitted. Currently, experimental broadcasting is being carried out regarding high-definition broadcasting, and the development of receivers for receiving this broadcasting is progressing. There is a need to develop equipment that is inexpensive and has good performance.

0002

2. Description of the Related Art In a conventional MUSE signal receiving device, as shown in FIG. It is input to a control signal separation circuit 2 that separates control signals included in the image, a motion detection circuit 3 that detects a motion area, and a still image area processing circuit 4.
Then, the pixel data is interpolated between frames and outputted and inputted to the mixing circuit 7, the video area processing circuit 5 performs field interpolation on the pixel data and outputted and inputted to the mixing circuit 7, and the motion detection circuit 3 A motion area is detected from the input MUSE signal and the detection signal is input to the mixing circuit 7. Based on the detection signal, the mixing circuit 7 processes the still image area processing circuit 4.
The output of the moving image area processing circuit 5 and the output of the moving image area processing circuit 5 are mixed in 16 steps to restore the video signal.

0003

[Problems to be Solved by the Invention] When a simple circuit using a one-frame memory is used as the motion detection circuit 3, since the MUSE signal samples and transmits image data, the pixels of the previous frame and the current frame are The sampling points are different for each pixel, making it difficult to perform accurate motion detection down to the details of the image. Therefore, image data processing may be performed by determining that a still image is a moving image, which causes problems such as blurring and blurring of the image and deterioration of the reproduced image quality. The present invention detects complete still image or quasi-still image information from motion information contained in the control signal of the MUSE signal, and uses the detection signal to cause the mixing circuit 7 to output the signal from the still image area processing circuit 4. The purpose is to prevent blurring and blurring of the image and improve the quality of the reproduced image by restoring the video signal as it is output.

0004

[Means for Solving the Problems] FIG. 1 is an electric circuit block diagram of a motion adaptive interpolation circuit showing an embodiment of the present invention.
The input circuit for the USE signal is branched, and the first
is input into the control signal separation circuit 2, the second branched signal is inputted into the motion detection circuit 3, the third branched signal is inputted into the still image processing circuit 4, and the fourth branched signal is inputted into the video processing circuit 5. The video processing circuit 5 interpolates between fields and outputs it, and inputs it to a mixing circuit 7. The still image processing circuit 4 interpolates between frames and outputs it, inputs it to the mixing circuit 7. The motion detection circuit 3 outputs pixel data. is detected as a multi-step motion detection signal and inputted to the mixing circuit 7 via the correction circuit 6.Based on the same input, the mixing circuit 7 receives the input from the video processing circuit 5 and the still image processing circuit 4. The control signal separation circuit 2 detects the motion information of bit numbers 16 to 18 included in the control signal of the MUSE signal, and the motion information is mixed with the input signal and output. Alternatively, if it is quasi-still image information, the detection signal is input to the correction circuit 6, and the same correction circuit 6
By correcting the multiple stages of motion detection signals,
The input from the still image processing circuit 4 is output from the mixing circuit 7 to restore the video signal.

[0005]

[Operation] With the above-described configuration, the present invention restores the video signal by interpolating data into the image data of the MUSE signal that is sampled and transmitted. When converting signals and displaying them, unlike when reproducing high-definition signals on a large display, high definition is not required, for example, the circuit is simplified and a simple motion detection circuit 3 using one frame memory is used. In this case, since the sampling points are different between the pixels of the previous frame and the pixels of the current frame, the still image may be determined to be a moving image and a detection signal may be output from the motion detection circuit 3. The motion information of bit numbers 16 to 18 included in the control signal of the MUSE signal as shown in FIG. 2 is detected, the detection signal from the motion detection circuit 3 is corrected, and the mixing circuit 7 is controlled. I have to.

When the motion information indicates a degree of motion from 3 to 7, the mixing circuit 7 uses the input from the video processing circuit 5 and the still image processing circuit based on the motion detection signal of multiple stages detected by the motion detection circuit 3. Mix the input from 4 and output it.
When the motion information indicates a completely still image of 1 or 2, or a semi-still image, the detection signal from the motion detection circuit 3 is corrected, and the input from the still image processing circuit 4 is output from the mixing circuit 7. This method restores the video signal, preventing image blurring and blurring that occurs when a still image is judged to be a video and processing the image data, and improves the quality of the playback image. .

[0007]

Embodiment FIG. 1 is an electric circuit block diagram of a motion adaptive interpolation circuit showing an embodiment of the present invention. The converted MUSE signal is branched, and the first branched signal is sent to the control signal separation circuit 2, the second branched signal is sent to the motion detection circuit 3, and the third branched signal is sent to the still image processing circuit 4. , the fourth branched signal is input to the video processing circuit 5. The moving image processing circuit 5 interpolates pixel data into fields for the luminance signal of the input MUSE signal, outputs the interpolated pixel data, and inputs the pixel data to the mixing circuit 7, and the still image processing circuit 4 converts the luminance signal of the input MUSE signal. On the other hand, the pixel data is interpolated between frames, output, and input to the mixing circuit 7. The motion detection circuit 3 may be a simple motion detection circuit 3 using one frame memory, as shown in the patent application filed by the applicant on December 28, 1990, for example.
may be used to detect the movement of pixel data as a five-step motion detection signal from 0 to 4 with respect to the luminance signal of the input MUSE signal, and input the signal to the correction circuit 6. Alternatively, as shown in the conventional example, the motion detection signal may be detected as a 16-step motion detection signal and input to the correction circuit 6.

[0008] MUS is used in small displays and current TVs.
In the case of converting and displaying an E signal, it is desirable to use the former method because it reduces the circuit scale, simplifies the circuit, and reduces circuit cost. FIG. 2 is an explanatory diagram of the control contents of the control signal included in the MUSE signal. As shown in the figure, motion information is included in bit numbers 16 to 18 of the 32-bit control signal. A value of 0 indicates normal, a value of 1 indicates a completely still image, a value of 2 indicates a semi-still image, and a value of 3 to 7 indicates the degree of movement. The control signal separation circuit 2 detects motion information of bit numbers 16 to 18 included in the control signal of the MUSE signal shown in FIG. is 3 to 7, the correction circuit 6 outputs the motion detection signal of multiple stages as it is, inputs it to the mixing circuit 7, and the mixing circuit 7 outputs the motion detection signal of the video processing circuit 5 based on the motion detection signal of the multiple 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 completely still image (1) or a quasi-still image (2), the correction circuit 6 corrects the multi-stage motion detection signal input from the motion detection circuit 3. The input from the still image processing circuit 4 is outputted from the mixing circuit 7, and the video signal is restored.

[0009]

[Effects of the Invention] As explained above, according to the present invention,
Even if a simple circuit is used as the motion detection circuit, or even if the motion detection circuit mistakenly detects a still image as a moving image, the motion information contained in the control signal of the MUSE signal can be detected. When the motion information is a completely still image,
Alternatively, in the case of semi-still images, by using the output of the still image processing circuit that performs interframe interpolation processing as the video signal to restore, it is possible to reproduce clear image quality with no image blurring or blurring. A motion adaptive interpolation circuit can be provided.

[Brief explanation of drawings]

FIG. 1 is an electrical circuit block diagram of a motion adaptive interpolation circuit showing one 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 electrical circuit of a main part of a conventional MUSE decoder.

[Explanation of symbols]

1 Input terminal 2 Control signal separation circuit 3 Motion detection circuit 4 Still image processing circuit 5 Video processing circuit 6 Motion compensation circuit 7 Mixed circuit 8 Output terminal

Claims (1)

[Claims] [Claim 1] MUSE converted into a digital signal
The signal input circuit is branched, the first branch is connected to the control signal separation circuit, the second branch is connected to the motion detection circuit,
The third branched signal is input to a still image processing circuit, and the fourth branched signal is inputted to a moving image processing circuit, and the moving image processing circuit interpolates within the field, outputs it, and inputs it to a mixing circuit. The motion detection circuit detects the movement of pixel data as a multi-step motion detection signal, and inputs it to the mixing circuit via the correction circuit, and inputs it to the mixing circuit. Based on the mixing circuit, the input from the video processing circuit and the input from the still image processing circuit are mixed and output, and the control signal separation circuit selects the bit numbers 16 to 16 included in the control signal of the MUSE signal. 18 motion information is detected, and if the motion information is completely still image or quasi-still image information, the detection signal is input to the correction circuit, and the correction circuit detects the signal input from the motion detection circuit. A motion adaptive interpolation circuit characterized in that a motion detection signal of multiple stages is corrected and outputted and inputted to the mixing circuit, and based on the input, the mixing circuit outputs an input from a still image processing circuit.