JPH04328979A - Moving adaptive type interpolation circuit - Google Patents

Abstract

PURPOSE:To simplify a circuit and to reduce cost by detecting moving information included in a MUSE signal and implementing still picture processing and moving picture processing depending on the state of detection so as to decode a video signal. CONSTITUTION:A moving vector signal and moving information included in a control signal of a MUSE signal are detected and discriminating by a control signal separate circuit 2, a signal from a movement detection circuit 3 is corrected by a correction circuit 6 and the result is inputted to a mixing circuit 7. When a moving vector is detected, it is mixed with an output of the moving picture processing circuit an when a complete still picture or a quasi-still picture is discriminated, the signal is mixed with an output of a still picture processing circuit 4 and the result is outputted from the mixing circuit 7. Thus, the circuit is simplified and the cost is reduced.

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 output and inputted to the mixing circuit 7, the video area processing circuit 5 performs intra-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.

The control signal separation circuit 2 separates the motion vector signals of bit numbers 2 to 8 of the control signal shown in FIG. Still image area processing circuit 4
Now, if the horizontal motion vector and vertical motion vector of the motion vector signal have values, calculate the adjustment values by calculating each value, adjust the address of the frame memory with the adjustment values, and set the current image one frame before. The position of the image data is moved and superimposed to perform interframe interpolation and input to the mixing circuit 7, and the motion detection circuit 3 corrects the motion detection signal using the input motion vector signal and performs the mixing. A correction signal is input to the circuit 7, and the signal from the still image area processing circuit 4 is outputted from the mixing circuit 7.

0004

[Problem to be Solved by the Invention] Therefore, the values of the horizontal motion vector and the vertical motion vector are calculated to obtain adjustment values, and the address of the frame memory is adjusted by the adjustment values, so that the current image is displayed as one frame before. The complicated process of moving and overlapping the image data and interpolating between frames increases the circuit size and circuit cost, but
M for small high-definition displays and current TVs
In the case of converting and displaying a USE signal, there is a problem that even if the complicated interpolation processing described above is performed, the effect is not improved. Also, if a simple circuit using one frame memory is used as the motion detection circuit 3,
Since the MUSE signal transmits image data in a sampled manner, the sampling points are different between the pixels of the previous frame and the pixels of the current frame, making it difficult to perform accurate motion detection down to the details of the image.

[0005] Therefore, there are cases in which a still image is determined to be a moving image and image data is processed, which causes problems such as blurring and blurring of the image and deterioration of the reproduced image quality. The present invention detects a complete still image or quasi-still image with motion information included in the control signal of the MUSE signal, and uses the same detection signal to send the still image area processing circuit 4 to the mixing circuit 7.
By restoring the video signal so that the signal from the control signal is output from the mixing circuit, blurring and blurring of the image can be prevented. The purpose is to reduce the circuit scale, simplify the circuit, and reduce the circuit cost by restoring the video signal by outputting the signal from the moving image area processing circuit 5 from 7.

[0006]

[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. The motion of is detected as a multi-step motion detection signal and inputted to the mixing circuit 7 via the correction circuit 6, and based on the 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 vector signal with bit numbers 2 to 8 included in the control signal of the MUSE signal, and adds a value to the motion vector signal. If there is, the detection signal is input to the correction circuit 6, the correction circuit 6 corrects and outputs the motion detection signal of the plurality of stages, and inputs it to the mixing circuit 7, and based on the input, the mixing circuit 7 performs video processing. The input from the circuit 5 is outputted, and the control signal separation circuit 2 detects motion information of bit numbers 16 to 18 included in the control signal of the MUSE signal, and the motion information is converted into a completely still image. , or if it is quasi-still image information, the detection signal is input to the correction circuit 6, and the correction circuit 6 corrects the plurality of stages of motion detection signals, so that the input from the still image processing circuit 4 is converted into the mixed image. The video signal is restored by outputting it from the circuit 7.

[0007]

[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, high definition is not required unlike when reproducing high-definition signals on a large display. Therefore, the values of the horizontal motion vector and vertical motion vector are calculated to obtain adjustment values, and the current image is Instead of performing complicated processing such as moving the position of the image data one frame before by the adjustment value and superimposing it and interpolating between frames, a motion vector signal included in the control signal of the MUSE signal is detected, If the same motion vector has a value, the same image quality can be obtained even if the video signal is restored by outputting the intra-field interpolated signal from the video area processing circuit 5 from the mixing circuit 7. Therefore, the circuit size can be reduced, the circuit can be simplified, and the circuit cost can be reduced.

[0008] Furthermore, when a motion detection circuit 3 using a 1-frame memory with a simplified circuit is used, 1
Since the sampling points of pixels in the previous frame and pixels in the current frame are different, a 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 is detected, the detection signal from the motion detection circuit 3 is corrected, and the mixing circuit 7 is controlled. It is possible to correct the case where the detection circuit 3 makes a false detection. Movement information is 3
7, the mixing circuit 7 mixes the input from the video processing circuit 5 and the input from the still image processing circuit 4 based on the multiple stages of motion detection signals detected by the motion detection circuit 3. If the motion information is 1 or 2,
When indicating a completely still image or a quasi-still image, the detection signal from the motion detection circuit 3 is corrected so that the input from the still image processing circuit 4 is output from the mixing circuit 7 to restore the video signal. This prevents image blurring and blurring that occurs when a still image is determined to be a moving image and processes the image data, thereby improving the quality of the reproduced image.

[0009]

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 picture processing circuit 5 interpolates pixel data into fields for the luminance signal of the inputted MUSE signal, outputs the interpolated pixel data, and inputs the pixel data to the mixing circuit 7, and the still picture processing circuit 4 outputs the luminance signal of the inputted 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 it 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.

[0010] 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. The correction circuit 6 inputs the multi-stage motion detection signal input from the motion detection circuit 3 as it is to the mixing circuit 7, and based on the same input, combines the input from the video processing circuit 5 and the input from the still image processing circuit 4. I am trying to mix and output. 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 vector signals are included in bit numbers 2 to 8 of the 32-bit control signal. , 2 to 5 represent horizontal motion vector signals, and 6 to 5 represent horizontal motion vector signals.
8 represents a vertical motion vector signal. The control signal separation circuit 2 detects the motion vector signal with bit numbers 2 to 8 included in the control signal of the MUSE signal shown in FIG. 2, and if the motion vector signal has a value, the control signal separation circuit 2 detects a motion vector signal and inputs it to a correction circuit 6, which corrects and outputs the motion detection signal of the plurality of stages and inputs it to a mixing circuit 7.
The video signal is restored by outputting the input from the moving image processing circuit 5.

In the control signal shown in FIG. 2, motion information is included in bit numbers 16 to 18, where 0 indicates a normal image, 1 indicates a completely still image, and 2 indicates a semi-still image. , and numbers 3 to 7 represent 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.

0012

[Effects of the Invention] As explained above, according to the present invention,
M for small high-definition displays and current TVs
When converting a USE signal and displaying it, if the motion vector has a value, instead of performing complicated processing such as interpolating between frames by moving and superimposing the position of the image data of the previous frame on the current image, Even if the video signal is restored by outputting the signal from the video area processing circuit that interpolates within the field from the mixing circuit, it is possible to obtain approximately the same image quality, and it can also be used as a motion detection circuit. Even if a simple circuit is used or a motion detection circuit incorrectly detects a still image as a video, M
The motion information contained in the control signal of the USE signal is detected, and if the motion information is a completely still image or a semi-still image, the still image processing circuit that performs interframe interpolation processing By using a restored video signal as the output, it is possible to reproduce clear image quality down to the details without image blurring or blurring. Therefore, the circuit size can be reduced and the circuit simplified, making it possible to adapt motion at low circuit cost. A type 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 Correction 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 and 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 mixes and outputs a motion vector signal included in the control signal of the MUSE signal, and motion information is detected, and if the motion vector signal has a value, the 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 inputs it to the mixing circuit. and, based on the input, output the input from the video processing circuit from the mixing circuit, and if the motion information is completely still image or quasi-still image information, input the detection signal to the correction circuit, The correction circuit corrects and outputs the multi-step motion detection signal input from the motion detection circuit, and inputs it to the mixing circuit, and based on the same input, the input from the still image processing circuit is output from the mixing circuit. A motion adaptive interpolation circuit.