JPH04373382A - Motion compensating device - Google Patents

Abstract

PURPOSE:To perform the still picture processing in the case that a picture is still even at the time of motion vector correction. CONSTITUTION:An input MUSE signal is delayed with a field as the unit by a delay circuit 201, an inter-frame interpolation circuit 101, and a frame memory 102, and this delay signal and the input MUSE signal are used to detect the motion in a motion detecting circuit 202, and this motion detection signal is used to delay the output of the frame memory 102 in accordance with a vector signal by a vector correcting circuit 107, and the vector correction video signal obtained by this delay and the delay video signal of a delay circuit 203 are switched by a switching circuit 204, and the output of this circuit 204 is used to perform the picture processing.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a motion compensation device for compensating for motion in high definition television signals.

0002

2. Description of the Related Art Conventionally, as a method of improving the image quality of television signals, a method of switching between moving images and still images is known. This takes advantage of the property that human vision has a lower resolution for "moving objects" and the property that still images do not require resolution in the temporal direction.One field of video constitutes one screen. However, in a still image, one screen is composed of multiple fields. As a result, the resolution of the still image portion can be increased and the image quality can be improved.

For example, MUSE (Multiple Su
b-Nyquist Sampling Encodi
ng) method performs offset subsampling between fields and frames, and transmits still images so that one screen is composed of 4 fields (2 frames) (``Development of MUSE method'' NHK Technical Research) (See Vol. 39, No. 2, 1982).

However, when MUSE processing is performed, the image quality of a particular moving image may be inferior to that of a still image. For example, when the camera pans or tilts, the entire screen is moving, so the viewer does not recognize the subject of interest as a "moving object" and cannot take advantage of the reduced resolution of the video. For this reason, when the camera pans or tilts, the viewer senses a decrease in resolution and feels that the screen is blurred.

In order to prevent such a phenomenon, there is a motion compensation device that corrects the motion vector of a television signal. That is, when the camera pans or tilts, still image processing is performed using a vector signal indicating the amount of movement of the camera and a vector-corrected video signal in which the screen of the previous frame is shifted by the vector amount of the movement. Detection of this motion vector is normally performed on the transmitting side, and is multiplexed with video data and transmitted as a control signal.

FIG. 2 shows a motion compensation device on the MUSE receiving side. The MUSE signal input to the input terminal 10 is input to one end of the interframe interpolation circuit 101 and also to one end of the motion detection circuit 105. A vector signal representing a motion vector amount included in the control signal of the MUSE signal is input to the input terminal 20 . The output of the interframe interpolation circuit 101 is input to a still image processing circuit 103 and a moving image processing circuit 104 that constitute image processing means, and is also input to a vector correction circuit 107 via a frame memory 102. Vector correction circuit 10
The output of 7 is input to the other end of the interframe interpolation circuit 101 and the other end of the motion detection circuit 105.

Vector correction circuit 107 from input terminal 10
The amount of delay until panning and tilting does not occur (
In this case, the vector signal is in the "0" state), and is approximately one frame or two frames long.

The interframe interpolation circuit 101 generates one screen of data using the input MUSE signal, which is the data of the current frame, and the output of the vector correction circuit 107, which is the data of the previous frame. The still image processing circuit 103 performs still image processing using data of the current frame and data of one frame before, and outputs the result to one end of the mixing circuit 106 . The moving image processing circuit 104 performs moving image processing using only the data of the current frame and outputs it to the other end of the mixing circuit 106. The motion detection circuit 105 detects a motion part using the MUSE signal input to the input terminal and the 1 frame delay signal or the 2 frame delay signal of the vector correction circuit 107, and sends the motion detection signal to the control terminal of the mixing circuit 106. Output. Mixing circuit 1
06 mixes the output of the still image processing circuit 103 and the output of the moving image processing circuit 104 in an appropriate ratio according to the motion detection signal, and derives the restored MUSE signal at the output terminal 30. The vector correction circuit 107 changes the amount of delay according to the vector signal at the input terminal 20, and in the case of panning and tilting, moves the data of the previous frame to the position of the current frame.

With the above configuration, when panning or tilting is performed, the signal of one frame before is shifted to a position according to the amount of motion vector, and still image processing is performed. However, even if motion vector correction is performed, a decrease in the resolution of the moving image may be detected. That is, this is a case where the camera pans or tilts in pursuit of a "moving object." In this case, even though the "moving object" is stationary on the screen, the background is processed as a still image by vector correction, and the "moving object" that the viewer is most interested in is processed as a moving image. Put it away. Therefore, the viewer feels that the "moving object" is blurred.

0010

[Problems to be Solved by the Invention] As explained above, in conventional motion compensation circuits, when motion vector correction is applied, static parts on the screen are processed as moving images, and data from multiple fields are used. There was a problem that it could not be processed.

The present invention has been made to solve the above-mentioned problems, and provides a motion compensation device that can perform still image processing on still parts of the screen even when motion vector correction is applied. The purpose is to

0012

[Means for Solving the Problems] The present invention provides a still image processing means for processing an input video signal as a still image, a moving image processing means for processing a moving image on the input video signal, and a moving image processing means for processing the input video signal in units of frames. A first motion detection signal is obtained by performing moving image detection using first and second video signals having a time difference of a first motion detection means for synthesizing the input video signal; a memory means for delaying the input video signal by frames to obtain a delayed video signal; and a vector indicating an overall movement amount in the same direction of the image obtained by the input video signal. When a signal is input, vector correction means for obtaining a vector correction video signal that corrects the position of the delayed video signal with respect to the screen according to the amount of movement; A second motion detecting means performs detection and obtains a second motion detection signal, and the output from the second motion detecting means is a still image as the first video signal supplied to the first motion detecting means. The apparatus further includes a switching means for selectively applying the delayed video signal when the video is displayed, and a switching means for applying the vector-corrected video signal outputted from the vector correction means when the apparatus is showing a moving image.

[0013]

[Operation] According to the above means, even if motion vector correction is applied, if the input video signal shows a still image and is stationary on the screen, this part can be processed as a still image, so it is good. You can get the image.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of a motion compensation device according to the present invention. The difference from the device shown in Figure 2 is that
The difference is that a delay circuit 201, a motion detection circuit 202, a delay circuit 203, and a switching circuit 204 are newly provided, and the same parts are given the same reference numerals and their explanation will be omitted. Delay circuit 2
01 delays the MUSE signal input to the input terminal 10 by a predetermined number of samples, and inputs the delayed signal to one end of the interframe interpolation circuit 101 and the motion detection circuit 105. The amount of delay from when the MUSE signal passes through the input terminal 10 to the frame memory 102 is approximately one frame or two frames. The motion detection circuit 202 performs motion detection using the MUSE signal input to the input terminal 10 and the one frame or two frame delayed signal of the frame memory 102. Delay circuit 203
delays the output of the frame memory 102 by a predetermined number of samples and outputs the delayed video signal to one end of the switching circuit 204. Further, a vector correction video signal from the vector correction circuit 107 is input to the other end of the switching circuit 204 . The switching circuit 204 is switched using the motion detection signal of the motion detection circuit 202 inputted to the control terminal, and when the motion detection circuit 202 detects a stationary state, the delay circuit 20 is switched.
3, and if motion is detected, the output of the vector correction circuit 107 is supplied to the other end of the interframe interpolation circuit 101 and the motion detection circuit 105.

When the vector signal is "0", the amount of delay from the output of the delay circuit 201 to the output of the switching circuit 204 is approximately one frame or two frames, regardless of the state of the switching circuit 204. Video processing and still image processing are performed.

When the motion detection circuit 202 detects motion when the vector signal is other than "0", the amount of delay from the output of the delay circuit 201 to the output of the switching circuit 204 is a delay amount corresponding to the vector amount, and the motion vector Corrections are made.

When the vector signal is other than "0" and the motion detection circuit 202 detects a stationary state, the amount of delay from the output of the delay circuit 201 to the output of the switching circuit 204 is approximately one frame or two frames, No motion vector correction is performed. At this time, the motion detection circuit 105 always detects a stationary state, and the mixing circuit 10 performs a mixed output based on this motion detection signal. In the above embodiment, the case where inter-frame interpolation is performed has been described, but the present invention can also be similarly applied to the case where intra-field interpolation is performed.

Furthermore, even for signals such as NTSC and PAL in which motion vector signals are not multiplexed, if vector detection is performed on the receiving side, it can be applied to Y/C separation, scanning line conversion, etc. Although only the receiving side has been described above, it is obvious that processing for still images and moving images can be switched in the same way on the transmitting side as well.

[0020]

[Effects of the Invention] As explained above, the motion compensation device according to the present invention has a simple configuration, and even when motion vector correction is applied, static image processing is performed on still parts of the screen. It can improve the image quality.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing an embodiment of a motion compensation device according to the present invention.

FIG. 2 is a block diagram showing a conventional motion compensation device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10, 20... Input terminal, 20... Output terminal, 101... Interpolation circuit between frames, 102... Frame memory, 103... Still image processing circuit, 104... Video processing circuit, 105, 202...
Motion detection circuit, 106... Mixing circuit, 107... Vector correction circuit, 201, 203... Delay circuit, 204... Switching circuit.

Claims (1)

[Claims] 1. Still image processing means for performing still image processing on an input video signal; moving image processing means for performing moving image processing on the input video signal; a first motion detection method that performs moving image detection using the second video signal to obtain a first motion detection signal, and combines the outputs of the still image processing means and the moving image processing means based on the first motion detection signal; means, memory means for delaying the input video signal by frames to obtain a delayed video signal, and when a vector signal indicating an overall movement amount in the same direction of an image obtained by the input video signal is input, vector correction means for obtaining a vector-corrected video signal that corrects the position of the delayed video signal with respect to the screen according to the amount of movement; and a vector correction unit that performs motion detection using the input video signal and the delayed video signal to detect a second movement. a second motion detecting means for obtaining a detection signal; and the first video signal to be supplied to the first motion detecting means; when the output from the second motion detecting means indicates a still image, the delayed video signal; 1. A motion compensation circuit comprising switching means for selectively providing a video signal and, when a moving image is shown, providing a vector-corrected video signal output from the vector correction means.