JPH065948B2 - Television signal processing device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television signal processing device, and in particular, a scan line is interpolated by using a motion vector between frames and fields to reproduce a high-definition image. The present invention relates to a signal processing device.

2. Description of the Related Art In recent years, many methods have been proposed for accurately receiving current television broadcasts and transmitting high-definition signals while maintaining compatibility. Among them, to improve the horizontal resolution, the high frequency component of the luminance signal is stacked on the color signal and transmitted (for example, Japanese Patent Laid-Open No. 60-12883), or multiplexed in the space of three-dimensional frequencies (for example, Kaisho 59-171387
The method and the like are conceivable. Further, as a method for improving the vertical resolution, a method of converting a conventional interlaced scan into a non-interlaced (sequential) scan using a memory (for example, Japanese Patent Laid-Open No. 58-101583) is considered. There is.

Hereinafter, an example of signal processing for improving the vertical resolution will be described with reference to the drawings.

FIG. 4 shows an example of a block diagram of a conventional motion adaptive scan conversion circuit. In the figure, a video signal is input to the input terminal 24 and is input to the 1-line delay circuit 24 and the field delay circuit 28. Field delay circuit 2
The output of 8 is further input to the field delay circuit 29,
The delay amount by the field delay circuits 28 and 29 is exactly 1
It becomes a frame. The input video signal and the output of the field delay circuit 29 delayed by one frame from the input video signal are input to the motion detection circuit 31, and the coefficient K (0K1) corresponding to the motion is obtained from the difference between the two signals. With this K, in the static portion, the field delay circuit 28 performs scanning line interpolation by the signal of one field before, and in the moving image portion, the 1 line delay circuit 25, the adder 26, and the coefficient unit 27 use the average value of the adjacent scanning lines to scan lines. Interpolation is performed. FIG. 5 schematically shows the operation of the motion adaptive scan conversion circuit. The solid line shows the scanning line, and the broken line shows the interpolating scanning line when the number of scanning lines is doubled.

Problems to be Solved by the Invention However, in the motion adaptive scan conversion circuit as in the above example, since the scanning line interpolation is performed by the average value of the upper and lower adjacent scanning lines in the moving image portion, the resolution in the vertical direction is Not improved. Further, the vertical resolution is improved because the scanning line is interpolated by the signal of one field before in the stationary state of a certain subject. Since it is interpolated, the vertical resolution deteriorates compared to the stationary state,
Since the difference is large, there is a problem that unnaturalness occurs.

Means for Solving Problems Conventionally, a method of detecting a motion vector as motion information between frames and fields in a television signal or the like and correcting the motion has been considered. Furthermore, a method of dividing a screen into a large number of sub-blocks, detecting a motion vector for each block, and performing motion compensation for each block has been considered (for example, the Institute of Electronics and Communication Engineers Image Engineering Research Group Report IE78-6).

The present invention uses a motion vector as motion information to perform scanning line interpolation using a signal of a previous field or a previous frame even in a moving image portion, thereby improving a vertical resolution of a moving image without deterioration of image quality. Is provided.

In the signal processing circuit of the present invention, as in the conventional case, the scan line interpolation is performed using the signal of the previous field for the stationary part, and the motion side also detects the motion vector between fields or frames for the moving image part and receives it. Send to the side
On the receiving side, the signal of the previous field is moved according to the motion vector to perform the scanning line interpolation, so that it is possible to always obtain a high-quality image in which the vertical resolution is improved irrespective of the stationary state and the moving state.

Embodiment One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of an embodiment according to the present invention.
A video signal is input to the input terminal 1, a motion vector is multiplexed on the video signal from the transmitter side and separated on the receiver side on the input terminal 2, and a motion vector is multiplexed on the video signal from the transmitter side on the input terminal 3 and separated on the receiver side. The selected area discrimination signal is input. The area discrimination signal is a signal for discriminating an area (hereinafter referred to as a vector movement area) that occupies a subject having the same motion as the motion vector, a motion area having a motion different from the motion vector, or a still area. . In the vector moving area, only the necessary portion, that is, the vector moving area is extracted from the previous field by the frame memory 6 controlled by the motion vector and used as an interpolation signal. For the stationary area, the field memory 5 uses the signal one field before as an interpolation signal. For a motion area different from the motion vector, the 1-line delay circuit 4,
The adder 7 and the coefficient unit 8 use the average value of the upper and lower adjacent scanning lines as an interpolation signal.

FIG. 2 shows an embodiment of a motion vector and area discrimination signal detection circuit on the transmission side. The video signal is input to the input terminal 12, and the comparator 14 compares it with the signal delayed by the frame memory 13, finds the case where the error is smallest, and determines the address at that time from the address control 15 of the frame memory. By determining the motion vector, the motion vector is determined. Further, for example, the area where the pixels in the case where the error for which the above-described motion vector is determined is the smallest is stored in the frame memory 18 and is set as the vector movement area. Further, the stationary area detection circuit detects a stationary area and adds it to the frame memory 18. An area discrimination signal is output to the output terminal 20 based on the information in the frame memory 18. The video signal is divided into several blocks, and the motion vector is obtained in each block. Therefore, the same number of motion vectors and area discrimination signal detection circuits as the number of divided blocks are required.

FIG. 3 is a diagram showing an example of a scanning line interpolation processing method using a motion vector in a certain block in a video signal. 20 is an area occupied by a moving subject in the previous field, and 21 and 22 are areas occupied by a moving subject in the current field. The area 20 corresponds to the area 21,
The motion vector 24 is obtained from the movement amount. The area 21 is an area that has moved the same as the motion vector, that is, the area 20 in the previous field is used as an interpolation signal. 20,2 in the current field
The region 2 is regarded as a moving image part, but its motion is different from the motion vector, and further, it cannot be used for interpolation because it has no correlation with the signal of the same region in the previous field. For such a portion, the average value of upper and lower adjacent scanning lines is used as an interpolation signal. 20,21,2 from the above block
The area of 23 excluding the area of 2 is a stationary part, so 1
The signal before the field is used as the interpolation signal.

According to the present invention, in the signal processing device for improving the vertical resolution of the video signal, by adopting the method of the scanning line interpolation by using the motion vector, the method of positively interpolating by the signal of the previous field is adopted. In addition to improving most of the vertical resolution in the video signal, the vertical resolution of a moving subject is always constant regardless of the still or moving state of the subject, so a high quality image without an unnatural image. Can be obtained.

[Brief description of drawings]

FIG. 1 is a block diagram of a receiving side according to an embodiment of the present invention, and FIG.
FIG. 4 is a block diagram of a transmitting side according to an embodiment of the present invention, FIG. 3 is a schematic diagram showing an example of a scanning line interpolation processing method using motion vectors, FIG. 4 is a block diagram showing a conventional example, and FIG. The figure is a schematic diagram of a conventional scanning line interpolation process. 4, 25 ... Line memory, 5, 28, 29 ... Field memory, 6, 13, 18 ... Frame memory, 7,
26, 33 ... Adder, 8 ... Coefficient unit, 14 ... Comparator, 10, 34 ... Time axis compressor.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Sadaji Kageyama 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. Electronic Industry Co., Ltd.

Claims (2)

[Claims] 1. An interlaced video signal as an input, and 1
The transmission side is equipped with a means for dividing one field or frame into blocks and detecting the field or inter-frame motion vector in each block for each block, and the receiving side is capable of detecting the previous field or previous frame according to the received motion vector. A television signal processing device, comprising a means for moving and interpolating a scanning line of a current field. 2. A means for discriminating between a still portion and a moving image portion in the video signal, and means for detecting the motion vector according to the first aspect are provided on the transmission side, and the video signal is detected from the above information received by the reception side. For each part, switching between interpolation by the average value of the upper and lower adjacent scanning lines, interpolation by the signal of one field or one frame before, and interpolation by the signal obtained by moving the signal of the previous field or previous frame according to the above motion vector are switched. The television signal processing device according to claim 1, wherein the television signal processing device is configured by including means.