JPH02140089A - Reduced sub picture synthesizer for color vtr in secam system - Google Patents

Abstract

PURPOSE:To obtain a synthesized picture with stable color, to simplify the device and to reduce the cost by providing two picture signal separation means, a sub picture signal processing means, a signal synthesis means and a synthesized signal conversion means. CONSTITUTION:A composite signal of an input sub picture is separated into a Y signal, a C signal and a synchronizing signal by a sub picture signal separator means 1 and the result is outputted to a sub picture signal processing means 3. A composite signal of an input master is separated into a Y signal, a C signal and a synchronizing signal by a master picture signal separator means 2, the synchronizing signal is outputted to the means 3 and the Y and V signals are outputted to the signal synthesis means 4 respectively. The means 3 applies A/D conversion and reduction processing to the inputted Y, C signals respectively, the result is stored and the reduced picture signal is read synchronously with the synchronizing signal of the master picture, the Y, C signals are D/A-converted and outputted with a switching control signal. The means 4 switches the Y, C signals inputted respectively from the means 2, 3 in response to the switching control signal, outputs the result as the Y,C signals of the synthesized picture and a synthesized signal conversion means 5 converts the signal into a composite signal and outputs the result.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a reduced sub-image composition apparatus for a color VTR using the SECAM method.

[Summary of the invention]

The present invention provides a reduction sub-image composition apparatus for a color VTR using the SECAM system, in which input master image or sub-image signals are a luminance signal (hereinafter referred to as "Y signal") and a color signal (hereinafter referred to as "C signal"), respectively. If it is a composite signal, it is separated into a Y signal and a C signal, and the Y signal and C signal of the sub image are subjected to image reduction processing and stored in memory, and then output in synchronization with the master image signal.

The Y signal and C signal of a composite image obtained by switching and combining the Y signal and C signal of the reduced sub-image and the master image, respectively, are converted into a composite signal and output.

[Conventional technology]

One of the various techniques applied to color TVs is a so-called picture-in-picture technique, in which a reduced sub-image is inserted into a part of a master image and displayed.

FIG. 3 is an explanatory diagram showing an example of the picture-in-picture, in which (A) shows a master image and (B) shows a sub-image.

In Fig. 3(C), the sub-image shown in Fig. 3(C) is 172
(The area is reduced to 1/4), and the image displayed by combining the reduced image with the master image shown in FIG. 3(A) is shown in FIG. 2(D).

Generally, a home VTR (video tape recorder) inputs an image signal as a composite signal (in the case of a large RF input, it is converted internally to a composite signal in advance).
Since the purpose is to record on tape and reproduce and output the same signal, there is also a terminal that separates and outputs the Y signal and C signal, such as the S terminal found on some high-performance machines. Yes, but.

In principle, it is output as a composite signal (often outputted to the outside after further RF conversion).

FIG. 4 is a block diagram showing the basic configuration of a conventional reduced sub-image synthesis device for picture-in-picture in a color VTR according to the NTSC system.

This reduced sub-image synthesizing device is an example in which both a master image and a sub-image are input as a component frame signal (GOMP). 73. The sub-image signal processing means 74 is composed of a sub-signal system consisting of a sub-signal converting means 75, and a signal synthesizing means 7B.

The composite signal of the input master image is.

a signal synthesis means 76 and a master signal system synchronization separation circuit 71;
and the APC circuit 72, respectively.

The synchronization separation circuit 71 separates the synchronization signal of the master image and outputs it to the sub-image signal processing means 74, and the APC circuit (auto phase controller) 72 separates the color subcarrier fsc of the master image and performs sub-signal conversion. Output to means 75.

The sub-image signal separation means 73 of the sub-signal system separates the inputted sub-image composite signal into a Y signal, a C signal, and a synchronization signal, and outputs them to the sub-image signal processing means 74.

The sub image signal processing means 74 performs A/D conversion 9 image reduction processing on each of the Y signal and C signal of the input sub image and stores them in memory.

Next, the reduced sub-image signal is sent to the synchronization separation circuit 7.
The Y signal and C signal are read out in synchronization with the synchronization signal of the master image input from 1, and the Y signal and C signal are each D/A converted and output to the sub signal converting means 75, and the signal synthesizing means 7 outputs a switching control signal. do.

The sub-signal conversion means 75 converts the input Y signal and C signal of the reduced sub-image into a composite signal whose phase is matched to the color subcarrier fSC of the master image input from the APC circuit 72, and outputs it to the signal synthesis means 76. do.

The signal synthesizing means 76 converts each composite signal of the input master image and reduced sub-image into the sub-image signal processing means 74.
The image was switched in response to a switching control signal input from the camera, and the composite image was output as a composite image (No. 4).

In the case of the PAL system, processing was almost the same as in the case of the NTSC system.

[Problem to be solved by the invention]

However, in the case of the SECAM system, it is very difficult to switch the composite signal and convert it directly into a composite image signal, so home VTRs that are equipped with such a reduced sub-image composite device either built-in or as an option are not commercially available. It had not been done.

The first reason is that the C signal is composed of two independent signals, e.g.
The TSC system consists of an I signal and a C signal, the PAL system consists of a U signal and a V signal, and the SECAM system consists of an RY signal and a BY signal.

In the NTSC and PAL systems, these two signals are sent together with the Y signal, but in the SECAM system, the R-Y signal and the B-Y signal are sent alternately for each LH (one horizontal scanning line) as the Y signal. Therefore, the composite signal of the sub-image must be configured in accordance with the type of signal of the master image.

The second reason is that in the NTSC and PAL systems, the hue of the C signal is determined relative to the burst signal, so when converting the Y signal and C signal of the sub-image to a composite signal, the phase of the modulated C signal is Master image color subcarrier fS
It is easy to match the phase of C.

However, in the SECAM system, the C signal is sent by FM modulation, so in the middle (when switching between master and sub), the color subcarrier f
SC continuity cannot be maintained.

Therefore, in the SECAM system, when images are synthesized by switching composite signals, colors may not match at all between the master image and the reduced sub-image, or color disturbances may occur that trail horizontally at the boundary line.

This invention was made in view of the above points, and is a SECAM with a relatively simple configuration, low cost, and stable color.
An object of the present invention is to provide a reduced sub-image compositing device for a color VTR based on the method.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a reduced sub-image composition apparatus for a color VTR using the SECAM method.
at least one image signal separation means for separating and outputting a composite signal of the master image or the sub-image into a Y signal, a C signal, and a synchronization signal, and performing image reduction processing on each of the Y signal and C signal of the sub-image; A sub-image signal processing means for outputting the reduced Y signal and C signal in synchronization with the master image signal after storing them in memory, and a Y signal and C signal output by this sub-image signal processing means and the Y signal of the master image. and a signal synthesizing means for respectively switching and outputting the Y signal and C signal of a composite image, and a synthetic signal converting means for converting the Y signal and C signal outputted by the signal synthesizing means into a composite signal. It is something.

[For production]

By configuring as described above, the present invention separates an image signal input as a composite signal into a Y signal and a C signal by using at least one image signal separating means, and sub-image signals are reduced by the sub-image signal processing means. The Y signal and C signal of the image are output in synchronization with the master image signal, and the Y signal of the master image signal and the reduced sub-image signal is
The signal and the C signal are respectively switched to form a composite image signal, which is then converted into a composite signal by a composite signal conversion means.

Therefore, it is possible to switch the one-color subcarrier 1sc without any problem of phase alignment or color signal loss, so we provide a reduced sub-image compositing device for a color VTR using the SECAM method with a relatively simple configuration, low cost, and stable color. You can.

〔Example〕

Hereinafter, the present invention will be specifically explained using examples.

FIG. 1 is a block diagram showing the basic configuration of an embodiment in which both a master image and a sub-image are input as composite signals, similar to the conventional example shown in FIG. 4.

This reduced sub-image synthesis device includes two image signal separation means, namely a sub-image signal separation means 1 and a master image signal separation means 2, a sub-image signal processing means 3, a signal synthesis means 4, and a composite signal conversion means 5. It is composed of.

The input sub-image composite signal is separated into a Y signal, a C signal, and a synchronization signal by the sub-image signal separating means 1, and each is outputted to the sub-image signal processing means 3.

Similarly, the composite signal of the input master image is
The master image signal separation means 2 separates the Y signal, the C signal, and a synchronization signal, and the synchronization signal is outputted to the sub-image signal processing means 3, and the Y signal and C signal are outputted to the signal synthesis means 4, respectively.

The sub-image signal processing means 3 performs A/D conversion and two-image reduction processing on the input sub-image Y signal and C signal, respectively, and stores them in memory.

Next, the reduced sub-image signal is read out in synchronization with the synchronization signal of the master image inputted from the master image signal separation means 2, and the Y signal and C signal are respectively D/A converted and the switching control signal is It is also output to the signal synthesis means 4.

The signal synthesis means 4 converts the Y signal and C signal of the master image input from the master image signal separation means 2 and the Y signal and C signal of the reduced sub image input from the sub image signal processing means 3 into sub image signals. In response to the switching control signal inputted from the processing means 3, the signal is outputted to the composite signal converting means 5 as the Y signal and C signal of the switching 1 composite image.

The composite signal converting means 5 converts the Y signal and C signal of the input composite image into a composite signal and outputs the composite signal.

FIG. 2 is a circuit diagram specifically showing the embodiment whose basic configuration is shown in FIG. 1, and the same parts are given the same reference numerals.

The difference between Figure 2 and Figure 1 is that it is shown specifically.
A system controller 6 that executes sequence control of the entire VTR, etc., and a mode changeover switch 7 that outputs the master image signal as it is at all times, that is, when not performing picture-in-picture (reduced sub-image composition).
This is the addition of .

The sub image signal separation means 1 includes an LPF (low pass filter) 11, a sync separation circuit 12, a BPF (band pass filter) 1711, a bell filter 14, and a chroma decoder 15.

The composite signal of the sub-image inputted to the sub-image signal separation means 1 is separated into a Y signal and a C signal by the LPFll and BPF 13, respectively.

From the Y signal, the synchronization separation circuit 12 outputs HSYNC.
(horizontal synchronization signal) and VSYNC (vertical synchronization signal) are separated.

The C signal is equalized by a bell filter 14 specific to the SECAM system, and then converted by a chroma decoder 15 into two color difference signals, that is, an RY signal and a BY signal.

The above Y signal, color difference signal (R-Y, B-Y), and synchronization signal (HSYNC, VSYNC) are each outputted from the sub-image signal separation means 1 to the sub-image signal processing means 3.

The input composite signal of the master image is divided into two parts and input to the master image signal separating means 2 and the mode changeover switch 7, respectively.

The master image signal separation means 2 is configured in exactly the same way as the sub image signal separation means 1, and outputs the synchronization signal of the separated master image to the sub image signal processing means 3, and outputs the Y signal and color difference signal to the signal synthesis means 4. be done.

The sub-image signal processing means 3 mainly includes a digital processing circuit 31, a RAM 32 which is an image memory, a dual LPF 53 for input signal conversion, and an A/D converter (AD).
C) 34, a D/A converter (DAC) Ei5 for output signal conversion, and a triple LPF 3B.

The synchronization signals of the sub-image and the master image are each directly input to the digital processing circuit 31.

The color difference signals (R-Y, B-Y) of the sub-image are processed by a double LPF.
; After harmonic components are blocked by 3.

The signals are input to the A/D converter 34 together with the Y signal, and each is converted into a digital signal and output to the digital processing circuit 31.

The digital processing circuit 51 is a CPU (not shown).

It is a microcomputer consisting of ROM, RAM, and each interface, and is connected to RAM32. by a pass line. A
/D converter 54. It is connected to the D/A converter 35 and the system controller 6, respectively, and inputs an image synchronization signal, and outputs a switching control signal to the signal synthesizing means 4 and a mode instruction signal to the mode changeover switch 7.

The digital processing circuit 31 stores the Y signal and color difference signal of the sub-image inputted from the A/D converter 34 for each pixel in the sub-image area of the RAM 32 in synchronization with the sub-image synchronization signal.

Next, the sub-image areas are each 2×2 or 3
The Y signal of one pixel of the reduced sub-image is subdivided into square blocks of ×3 pixels, and the average value of each of the Y signal, RY signal, and B-Y signal for each block is calculated as the Y signal of one pixel of the reduced sub-image.

The signals are stored in the reduced image area of the RAM 52 as the R-Y signal and the B-Y signal.

The reduced image data of 1/2 or 1/3 of the sub-image stored in this reduced image area is read out in synchronization with the synchronization signal of the master image and is output to the D/A converter 35.

During this output synchronization, data readout of the reduced sub-image is
, The vertical position of the reduced sub-image depends on which horizontal scanning line it starts from, counting from S Y N C.
The left and right positions are determined depending on how late the start is from 8YNC.

The scale factor of the reduced sub-image and its position are determined by the picture-in-picture
It is stored in the ROM of the digital processing circuit 31 in advance depending on the picture mode.

The input reduced sub-image data is converted into an analog signal by the D/A converter 35, and the data is converted to an analog signal by the D/A converter 35,
are outputted to the signal synthesizing means 4 as a Y signal, a RY signal, and a BY signal, respectively.

The signal synthesizing means 4, which consists of three analog switches, generates each Y signal and R signal of the master image and the reduced sub-image for each switch.
-Y signal and B-Y signal are input to the digital processing circuit 31
In response to a switching control signal input from , the signal is switched to the master side at all times, and switched to the reduced sub side while the reduced sub image signal is being read out, and outputted to the combined signal converting means 5 as each signal of the combined image.

The composite signal conversion means 5 includes an encoder 51. Antibell filter 52. Analog adder circuits (+) 53 are connected in series.

Among the input signals, the R-Y signal and the B-Y signal are input to the encoder 51, and alternately for each IH, the R-Y signal is 4.4
The 0625 MI (z, B-Y signal is outputted to the antibell filter 52 by FM modulating two color subcarriers fsc having frequencies close to each other of 4.25 MIk).

The antibell filter 52 is also unique to the SECAM system, and in order to ensure compatibility with black-and-white TV, the antibell filter 52 is centered around the two color subcarriers fSC so that the carrier C signal does not interfere with the Y signal in the achromatic part. It has the characteristic of attenuating in an inverted bell shape.

The C signal that has passed through the antibell filter 52 is input to an adder circuit 53 together with the Y signal, where it is converted into a composite signal of a composite image, and is output to the mode changeover switch 7.

The mode changeover switch 7, which is an analog switch, inputs each composite signal of the master image directly sent from the input end of this reduced sub-image composition device and the composite image output from the composite signal conversion means 5, and digitally processes it. circuit 5
Depending on the mode instruction signal input from 1, it is normally switched to the master side, and switched to the compositing side when executing picture-in-picture.

Outputs a composite signal of the specified image.

As explained above, according to the present invention, the master image signal is also converted into a Y signal and a C signal, and after picture-in-picture image synthesis is performed by switching, the signal is converted into a composite signal and output. As a result, there is no loss of the color subcarrier fSC or color inversion, so there is no color mismatch between the master image and the reduced sub-image or color disturbances that trail horizontally at the boundary line.

In this embodiment, since the case where both the master image and the sub-image are composite signals is used, two image signal separation means are used. In some cases, it is common for either the master image or the sub-image to be a VTR playback signal.

In this case, since the VTR playback signal is given as a signal before being converted into a composite signal, that is, a Y signal, a R-Y signal, and a B-Y signal, the image signal separation means inputs it from the outside as a sub image or a master image. Only one is required for composite signals.

Furthermore, since the image signal separation means and the signal conversion means are necessary on the input side and the output side, respectively, even in a normal color VTR, they are used as the sub-image signal separation means 1 or the master image signal separation means. If either of the means 2 and the composite signal converting means 5 are used, what is newly required for this reduced sub-image composition device is the sub-image signal processing means 3, the signal composition means 4, and the mode changeover switch. 7, the cost can be significantly reduced.

In addition, although the master image and the sub-image have been described as being independent of each other, for example, the sub-image may be one or more still images at an arbitrary moment of the master image,
In this case, not only can the device be used to target the reproduction signal of the VTR, but it can also be used as a device to target the image signal input from the outside, regardless of the operation of the VTR itself, by using a single image signal separation means. be able to.

〔effect〕

As explained above, according to this invention, SECA
In a color VTR based on the M system, it is possible to provide a reduced sub-image composition device with a relatively simple configuration, low cost, and stable colors.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the basic configuration of an embodiment of the present invention, FIG. 2 is a circuit diagram showing the specific configuration thereof, FIG. 3 is an explanatory diagram showing an example of picture-in-picture, and FIG. The figure is a block diagram showing the basic configuration of a conventional example. 1...Sub image signal separation means 2...Master image signal separation means 3...Sub image signal processing means 4...Signal synthesis means 5...Synthesis signal conversion means 1
2... Synchronous separation circuit 14... Bell filter 15.
...Chroma decoder 31...Digital processing circuit (microcomputer)
32...RAM (image memory) 34...A/D converter (ADC) 35...D/
A converter (DAC) 51...encoder 52
... Antibell filter 53 ... Addition circuit Fig. 3

Claims (1)

[Scope of Claims] 1. In a reduced sub-image synthesis device for a color VTR using the SECAM system, at least one image that separates a composite signal of a master image or a sub-image into a luminance signal, a color signal, and a synchronization signal and outputs the separated signals. a signal separation means; a sub-image signal processing means for performing image reduction processing on the luminance signal and color signal of the sub-image and storing them in memory; and then outputting the reduced luminance signal and color signal in synchronization with the master image signal; a signal synthesizing means that switches between the luminance signal and chrominance signal outputted by the sub-image signal processing means and the luminance signal and chrominance signal of the master image, respectively, and outputs them as the luminance signal and chrominance signal of a composite image; 1. A reduced sub-image compositing device for a color VTR using the SECAM system, characterized in that it is equipped with a composite signal converting means for converting a luminance signal and a chrominance signal into a composite signal.