JPH02266781A - Signal processing device - Google Patents

Abstract

PURPOSE:To accurately separate synchronizing signals by outputting a scanning line interpolated signal dependent upon inter-field processing, which is the signal of one system, as an interpolated scanning line signal from a mixing means in a vertical blanking period. CONSTITUTION:In the vertical blanking period, a changeover switch 13 is connected to the H side. Therefore, an interpolated scanning line signal Yi outputted from a mixing circuit 4 is an interpolated scanning line signal (c) dependent upon inter-field processing which is the signal of one system though motion information K detected by a motion detecting circuit 7 has a large value, for example, one. In the blanking period, the outline correction processing is not performed in a signal processing circuit 8. Therefore, the shape of a vertical synchronizing signal part of a video signal Y' supplied from a D/A converter 9 to a synchronizing signal separating circuit 11 is not different between odd and even fields, and a vertical synchronizing signal PV is accurately separated by the synchronizing signal separating circuit 11.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a signal processing device suitable for application to a high-definition television receiver that performs motion-adaptive scanning line interpolation processing.

[Prior Art] In high-definition television receivers such as IDTV and EDTV that make full use of digital signal processing technology, non-interlaced scanning is performed to improve image quality deterioration caused by interference such as line flicker and line scrolling.

FIG. 2 shows an example.

In the figure, a luminance signal Y supplied from an input terminal 1 is supplied to a delay element 2 which is composed of a line memory and has a delay time of one horizontal period (lH), and an output signal of this delay element 2 is composed of a field memory. and one field period (
is supplied to a delay element 3 having a delay time of IF). The signal of the previous field is output from the delay element 3 as an interpolated scanning line signal by interfield processing, and this interpolated scanning line signal is supplied to the mixing circuit 4.

The luminance signal Y supplied to the input terminal 1 is also supplied to the adder 5. This adder 5 is supplied with output No. 13 of the delay element 2. The output signal of this adder 5 is supplied to a level adjuster 6 and halved. From this level adjuster 6, a signal obtained by adding and averaging the current scanning line signal and the scanning line signal of the previous line is output as an interpolated scanning line signal by intra-field processing, and this interpolated scanning line signal is supplied to the mixing circuit and the cloud. be done.

In addition, the luminance signal Y supplied to the input terminal 1 is supplied to the motion detection circuit 7ξ, and the second signal Y is supplied to the motion detection circuit 7.
For example, 1f! Movement information K (0≦≦
X) is formed. This motion information I( increases as the amount of motion increases. This motion information I( is supplied to the mixing circuit 4 as a 111 signal.

) In the mixing circuit 4, the interpolated scanning line (No. 8) by intra-field processing and inter-field processing is mixed according to the motion information (). In other words, the coefficients of the signal obtained by the intra-field processing are , on the other hand, the coefficients of the signal obtained from the field interrogation are made into l- and mixed.
Output No. 16 of the house circuit 4 is supplied to the signal processing circuit 6 as an interpolated scanning line signal Y1.

Moreover, the crane j degree signal Y supplied to the input terminal 1 is
The line signal Y is processed by the signal processing circuit 8ζ.This signal processing circuit 8 performs 56x conversion processing and horizontal and vertical axis correction processing.In other words, in the double conversion processing, ] By inserting the interpolated scanning line signal Y1 between the main scanning line signals 71, a non-interlaced signal can be obtained. Here, the corresponding luminance signal is emphasized.

The non-interlaced n-degree signal Y' outputted from the signal processing circuit 8 is supplied to a D/A converter 9 where it is converted into an analog signal, and then supplied to the picture tube 10.

Further, the analog luminance signal Y' outputted from the D/A converter 9 is supplied to the synchronization separation circuit 11, and the horizontal opening IIJ
! Signal PH and vertical synchronization signal PV are separated. These 11 JI signals PILPV are supplied to the prefectural circuit 12. The horizontal and vertical deflection control of the picture tube io mentioned above is performed by this deflection circuit 12.

As a result, a non-interlaced image is displayed on the screen J2 of the picture tube 10.

[Problems to be Solved by the Invention] In the example shown in FIG. Only line signals are output.In other words, No. 18 supplied to input terminal 1 is a, the output signal of delay element 2 is 1), the output signal of delay element 3 is C11, and the output signal of novel adjuster 6 is (1).
Then, Yi = d = (a, + b) / 2.

Here, the vertical synchronizing signal portions of the luminance signal Y are arranged in odd and even fields as shown in FIGS. 3A and 3C, respectively. Therefore, the interpolated scanning line signal Yi is the interpolated scanning line (+'i
When there is only a signal, the vertical synchronizing signal portion of the luminance signal Y' becomes as shown in FIG. Like this: f
The waveforms of the vertical synchronization signals are different between the i-numbered field and the even-numbered field.

Therefore, in the synchronization separation circuit 11, the vertical direction Ill number P
In addition, there was an inconvenience that the separation of ν could no longer be carried out accurately, and the image displayed on the screen L of the picture tube 10 would be vibrated in the vertical direction, resulting in a deterioration of the image quality. In order to simplify the explanation, the waveform shown in FIG. 3 is shown without contour correction processing. :3 The waveform of the vertical comrade signal as shown in Figure 13 and D changes more complexly, causing the sync separation circuit x1 to
There is an inconvenience in that the division of the vertical synchronizing signal pv is further deteriorated.

Further, in the example shown in FIG. 2, the signal processing circuit 8 performs contour correction processing, but if, for example, there is a large edge in the horizontal or vertical direction in a dark part of the image, the amplitude of the luminance signal will be equalized by the contour correction processing. It extends largely toward the U signal side.

Therefore, in the synchronous separation circuit 11, the open/open signal P in the synchronous separation circuit 11 is separated by imposing this extended part.
There was an inconvenience that adversely affected the separation of H and PV.

SUMMARY OF THE INVENTION Therefore, it is an object of the present invention to ensure that the synchronization separation operation in the synchronization separation circuit is performed accurately.

[Means for Solving the Problems] The present invention provides first processing using in-field processing from a video signal.
means for forming a second interpolated scanning line signal by field interleaving processing from the video signal; motion detection means for detecting image movement from the video signal; A signal processing device comprising a mixing means for mixing a second interpolated scanning line signal according to a detection signal from the motion detecting means, further comprising a control means for controlling a mixing ratio of the mixing means, and a control means for controlling a mixing ratio of the mixing means; During the period, the mixing means outputs only the first interpolated scanning line signal.

[Function] In the above configuration, only the first scanning line interpolation signal is output from the mixing means 4 during the vertical blanking period. Since this first interpolated scanning line signal is one system of signals that is processed by interfield processing, the shape of the vertical synchronization signal portion of the video signal supplied to the synchronization separation circuit 11 is different between odd and even fields. The synchronization separation circuit 11 can accurately separate the vertical synchronization signal Pv.

[Embodiment] An embodiment of the present invention will be described below with reference to FIG. In FIG. 1, parts corresponding to those in FIG. 2 are designated by the same reference numerals, and detailed explanation thereof will be omitted.

In the figure, the motion information from the motion detection circuit 7 is supplied to the H-side fixed terminal of the changeover switch 13, and the rOJ signal is supplied from the terminal 14 to the H-side fixed terminal. The output signal of this switching switch I3 is supplied to the mixing circuit 4 as motion information '.

In this mixing circuit 4, interpolated scanning line signals obtained by intra-field processing and inter-field processing are mixed according to the motion information IK'. That is, the coefficients of the signal obtained by the intra-field processing are set to 1, and the coefficients of the signal obtained by the inter-field interleaving processing are set to 1-2' and mixed. The output signal of this mixing circuit 4 is supplied to a signal processing circuit 8 as an interpolated scanning line signal Yi.

Further, horizontal and vertical blanking pulses BP related to the luminance signal supplied to the input terminal 1 are supplied to the terminal 15, and this blanking pulse BP is supplied to the changeover switch 1.
3 as a switching control signal. In this case, the selector switch 13 is set to H during the horizontal and vertical blanking periods.
during other periods, while connected to Lll during other periods.

Further, the blanking pulse BP supplied to the terminal 15 is supplied to the signal processing circuit 8 as an operation control signal. In this signal processing circuit, the contour correction process is performed only during the video period, and is controlled so that the contour correction process is not performed during the blanking period. Furthermore, in this signal processing circuit, limiter processing is performed to limit the amplitude of the luminance signal on the synchronization signal side to a constant level that does not adversely affect the separation processing in the synchronization separation circuit 11 during the video period.

The present example is constructed as described above, and the rest is the same as the example shown in FIG.

In this example, since the selector switch 13 is connected to the H side during the vertical blanking period, even if the motion information K detected in the motion detection circuit 7 becomes a large value, for example, l, the mixing circuit The interpolated scanning line signal Yi output from 4 becomes an interpolated scanning line signal obtained by interfield processing, which is an l-system signal.

In other words, Yi=c. Further, in the signal processing circuit 8, contour correction processing is not performed during the blanking period. Therefore, the shape of the vertical synchronization signal portion of the video signal Y' supplied from the D/A converter 9 to the synchronization separation circuit 11 does not differ between odd and even fields, and the vertical synchronization signal Pv is no longer different in the synchronization separation circuit 11. Be separated accurately.

In addition, in this example, the signal processing circuit 8 performs limiter processing during the video period, and the amplitude of the synchronization signal side of the crocodile rate signal is limited to a certain level, so that this part may be mistakenly separated by the synchronization separation circuit 11. The synchronization separation is performed accurately.

In this way, according to this example, in the synchronization separation circuit 11, tll l! No. P)1. PV can be separated accurately and deterioration of image quality can be prevented.

[Effects of the Invention] As described in 1-1 below, according to the present invention, during the vertical blanking period, the scanning line interpolation signal obtained by interfield processing, which is one system of signals, is output as an interpolation scanning line signal from the mixing means. As a result, the shape of the vertically equal amount (number 8 part) of the video signal supplied to the sync separation circuit does not differ between odd and even fields, and the sync separation in the sync separation circuit can be performed accurately. I can do it.

Therefore, according to the present invention, image quality deterioration such as vertical vibration of an image can be effectively prevented.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a configuration diagram showing an embodiment of the present invention, FIG. 2 is a configuration diagram of a conventional example, and FIG. 3 is a waveform diagram for explaining the same. l Φ 4 5 and 6 φ 8・10 φ 12 ・・Input terminal・Delay element・M extension element・Mixing circuit・Addition W, B・1 novel adjuster・Motion detection circuit・Signal processing circuit・D/A conversion equipment/picture tube/synchronization separation circuit/deflection circuit 13...changeover switch 14...terminal 15...terminal

Claims (1)

[Claims] (1) means for forming a first interpolated scanning line signal by intra-field processing from the video signal; means for forming a second interpolated scanning line signal by interfield processing from the video signal; A signal processing device comprising a motion detection means for detecting motion, and a mixing means for mixing the first and second interpolated scanning line signals according to a detection signal from the motion detection means, the mixing ratio of the mixing means A control means is provided for controlling the mixing means, and during the vertical blanking period, the mixing means controls the first
A signal processing device characterized in that it outputs only an interpolated scanning line signal.