JPH01318365A - Magnetic recording and reproducing device integrated with camera - Google Patents

Abstract

PURPOSE:To synthesize two pictures so that their center objects are placed in centers of respective picture areas of the synthesized picture by shifting and controlling the write address of a video memory under the control of a write control part. CONSTITUTION:The first video signal inputted as a write video signal is written in a video memory 1 while being subjected to picture movement and reduction in a write control part 3 in accordance with a picture synthesis purpose by shift control and thinning control, and the first video signal subjected to picture movement and reduction and the second video signal of the photographed picture of a camera part are synthesized. Thus, the picture synthesizing function is realized in a general home magnetic recording and reproducing device integrated with the camera without an expensive device like a frame synchronizer, and pictures are so synthesized that center object parts of respective pictures to be synthesized are placed in centers of respective picture areas of the synthesized picture.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a camera-integrated magnetic recording and reproducing device that enables two-screen composition.

[Conventional technology]

A special function often seen in TV broadcast programs is a two-screen compositing function.

This two-screen compositing function is a screen compositing function that combines the first video and the second video by dividing them horizontally, vertically, etc., and can be used to combine a panoramic view and a close-up view in sports broadcasts, or in dramas, etc. It is used in a variety of screen configurations, such as incorporating two video expression objects into one screen.

[Problem to be solved by the invention]

However, in general, to realize the above-mentioned two-screen composition function, an expensive frame synchronizer and a professional video camera with external synchronization are required. This is a function that is difficult to achieve with a portable video camera.

[Purpose of the invention]

In view of the above circumstances, the present invention realizes a two-screen compositing function with a camera-integrated magnetic recording and reproducing device used in general households, and also allows the central subject of two video screens to be combined to be different from each other in the combined screen. The aim is to position it in the center of the screen area.

[Summary of the invention]

In order to achieve the above objects, the present invention has the following features: 1. A video memory device is built into a camera-integrated magnetic recording/reproducing device, and a first video signal input manually as a written video signal is moved or reduced in accordance with the purpose of screen composition. The central subject of each video screen is truncated by writing to or reading from the video memory while giving the image, and combining the first video signal with this screen movement and reduction with the second video signal, which is the image taken by the camera unit. This was done so that it would not happen.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be explained based on the drawings.

FIG. 1 shows a block diagram of an embodiment of a video integrated magnetic recording and reproducing apparatus according to the present invention. Note that the figure shows only the video memory device part that constitutes the main part of the present invention, and the well-known camera part and VTR part (magnetic recording and reproducing part) are not shown.

In the figure, 1 is an A/D converter, 2 is a video memory, and 3 is an A/D converter.
4 is a write control section, 4 is a read control section, 5 is a D/A conversion section, 6 is a synthesis section, and 7 is an encoder section, and the circuit constituted by these symbols 1 to 7 forms a so-called video memory device. There is.

The A/D converter 1 can be configured by providing an A/D converter for each component of the first video signal sent in analog component format, or by using one A/D converter in time division. It converts an analog component video signal into a digital code and sends it to the video memory 2.

Note that the first video signal is either a reproduction signal from a VTR section, a line input signal from the outside, or a video signal photographed by a camera section. Further, as the configuration of the component components, for example, a luminance signal Y, a color difference signal (RY), (B-Y), a synchronization signal, etc. are adopted.

When the first video signal is a composite video signal, it goes without saying that a decoder and a synchronization separator for converting the composite video signal into a component video signal are provided before the A/D converter 1.

The video memory 2 has a two-dimensional data array or address configuration memory area that substantially corresponds to a television screen for each of luminance signal data and color difference signal data, and can perform writing and reading simultaneously and asynchronously. It is configured as follows.

For example, there are 512 luminance sample points in the effective screen period during one horizontal scanning period (LH period) and one vertical scanning period (IV period).
If 256 effective scanning lines are defined, the H direction will be a 9-bit address, the ■ direction will be an 8-bit address, and the total number of sample points will be 512×256=131072. Therefore, assuming that the number of quantization bits for each sample is 8 bits, the luminance memory capacity is 131072 x 8 = 1.049 megabits.

Furthermore, assuming that the required color signal band is 1/4 of the luminance signal band, the number of color difference sample points may be 128 per IH. Therefore, two color difference signals (R-Y), (B-Y
) is 128X2 = 256, so if the number of quantization bits is also 8 bits, the color difference memory capacity is 2.
56 x 256 bits, 0,524 megabits.

The write control unit 3 controls writing to the video memory 2, and manages and controls the relationship between the memory address of the video memory 2 and the sample point address of the input video signal in synchronization with the synchronization signal of the first video signal. With,
Processes the flow of data to memory and generates address codes and instruction codes for video memory.

This write control unit 3 normally sets the memory address of the video memory 2 and the sample point address of the human video signal to 1=1.
However, if it is made to correspond to 1:N, a screen compressed to 1/H will be stored in the video memory 2.

Furthermore, if a deviation is given to the relationship between the memory address and the sampling point address, a screen that has been moved vertically and horizontally by the amount of deviation is stored on the video memory 2, and furthermore, the memory address or the sampling point address can be specified. If writing is allowed only within the range, it is possible to partially rewrite the written image on the video memory.

The read control unit 4 performs read control for the video memory 2, and controls the read address in selective synchronization with either the internal synchronization signal or the synchronization signal of the second video signal, and controls the read address of the video memory 2. It manages and controls the relationship between addresses and two-dimensional addresses of synchronization signals, processes the flow of read data from memory, and generates address codes and instruction codes for the memory. Furthermore, a synchronization signal (including blanking pulses, clamp pulses, etc.) and color subcarriers used in the encoder unit 7 are generated in association with the read address.

This read control unit 4 usually makes the sample point address of the read data correspond to the memory address as 1=1, but by setting it to N or giving a deviation, it can perform the same processing as the write control unit 3. It can be performed.

The D/A converter 5 converts data read from the video memory 2 into an analog component video signal.

The synthesizing section 6 is a circuit that converts the video signal photographed by the camera section into a second video signal, and synthesizes the second video signal and the first video signal sent from the video memory 2 on a screen. Various screen composition functions can be realized by controlling the mixing ratio of the two video signals in various ways.

For example, changing the mixing ratio instantaneously will result in a screen change, keeping the mixing ratio constant will result in a mixed screen, and by controlling the rate of change in the mixing ratio, soft edge effects, cross-fades, etc. can be achieved.

The encoder section 7 is a circuit that converts the analog component video signal output from the synthesis section 6 into a composite video signal and outputs the composite video signal.

Next, the two-screen compositing operation in the above embodiment will be explained.

Note that as the first video signal, as mentioned above, VT
This is either a reproduced signal from the R section, a line human input signal from outside, or a video signal photographed by a camera section. Therefore, when the operation modes of the present invention are classified according to these signals, they can be divided into the following three modes.

■ When the first video signal is a playback signal from a VTR unit and the second video signal is a video signal from a camera unit ■ The first video signal is a line signal from outside and the second video signal is a playback signal from a camera unit. When the video signal is from the camera unit ■ When the first video signal and the second video signal are both video signals from the camera unit. In this case, the video signal from the camera section is once taken into the video memory as a still image, and then this still image is combined with a video image subsequently shot by the camera section.

Although the above three operation modes differ in the type of first video signal, the screen composition operation itself is the same. Therefore, we will take case ■ as an example to represent these,
The operation will be explained below.

First, the operation of screen composition by dividing the screen into left and right halves will be explained. It should be noted that the video screen of the central subject "A" shown in FIG. Using the image screen of the central subject "B" shown in Figure (C), the image in Figure 2 (a) is placed on the left half of the composite screen, and the image in Figure 2 (C) is placed on the right side of the composite screen. It is assumed that the images are divided and two screens are combined.

In the case of two-screen composition by left-right division as described above, the composition section 6 selects the video screen of the VTR section in the left half of one horizontal scanning period (LH period), and selects the video screen of the camera section in the right half. and output it.

Therefore, if the sample point address and memory address of the video screen of the VTR unit shown in FIG. When the image screen of the camera unit and the image screen of the camera unit are combined in the left and right parts by the combining unit 6, the combining unit 6
In the composite output video output from , the right half of the video screen of the VTR section and the left half of the video screen of the camera section are truncated.
The resulting composite screen is a screen in which the right half of the central subject rAJ on the video screen of the VTR unit is cut off, as shown in FIG.

In the above case, the camera angle of the video screen of the camera unit may be adjusted on the spot so that the central subject "B" is located at the center of the right half of the screen.

However, the video screen of the VTR section is a reproduction signal of a tape that has already been recorded, and unlike the video screen of the camera section, it cannot be changed to a desired angle on the spot. - When shooting a video while fishing on a boat, it is common for the central subject to be photographed in the center of the screen, so if the two screens are combined without any processing as described above, the video screen of the VTR section will be The result is a composite screen in which part of the central subject "A" is cut off.

Therefore, as shown below, the center subject of the video screen of the VTR section is moved and written to the video memory 2 so that it will not be lost on the composite screen, and the VTI with this screen movement is The video screen of the R section and the video screen of the camera section are combined into left and right parts.

Now, the video screen of the VTR section shown in FIG. 2(a) and the address of the video memory 2 shown in FIG. 2(b) are respectively 1.
It is defined by 512 luminance sample points in the effective screen period of the horizontal scanning period (IH period) and 256 effective scanning lines in one vertical scanning period (IV period), and the horizontal direction of each two-dimensional address is 511H1 vertical direction OV~255
It shall be expressed as V.

In the case of two-screen synthesis by left-right division, the write control section 3 applies a shift to the write address using a shift control signal so that 128H of the video screen of the VTR section is written to the OH of the video memory 2. As a result, the video screen of the VTR unit is written on the video memory 2 in a state in which it has been moved by 174 screens to the left, as shown in FIG. 2(b).

The readout control section 4 reads out the 1st video of the VTR section written in the video memory and moved to the left by 1/4 in synchronization with the second video signal, that is, the video signal of the camera section, and reads out the 1st video of the VTR section written in the video memory and shifted to the left by 1/4, and converts it to the D/A conversion section 5. It is sent to the synthesis section 6 via.

In the synthesis section 6, the video signal of the VTR section read out from the video memory 2 is selected and outputted at the read address OH-255H, and the video signal from the read address OH-255H is selected and outputted.
During 511H, the mixing ratio is controlled so that the video signal of the camera section is selected and output.

Therefore, the composite screen obtained by the composite unit 6 is as shown in FIG.
As shown in d), the central subject “A” on the video screen of the VTR section
" is placed almost in the center of the left half of the screen (OH-255H), and the center subject "B" on the video screen of the camera unit is placed in the right half of the screen (256H-5) by adjusting the camera angle.
1'lH), and as mentioned above, the VT
This prevents a part of the central subject r A J of the video screen of the R section from being cut out.

In addition, when combining the video of the VTR section and the video of the camera section by arranging them left and right opposite to the above, it is sufficient to give the address shift to the right side at the time of memory writing, and when combining the images divided into upper and lower parts, It is sufficient to give a shift to the address in the vertical direction.

Furthermore, if the horizontal and vertical addresses are simultaneously shifted, screen movement in the diagonal direction is also possible. Furthermore, the switching address position in the combining section 6 can be arbitrarily determined and may be changed over time.

Next, the operation in the case of one-screen composition by embedding will be explained.

As shown in Fig. 5, in the case of so-called inset composition in which the image of the VTR section is fitted into a relatively small area of the image screen of the camera section, the center subject "A" of the image screen of the VTR section to be fitted is inserted into the image frame. Even if it is synthesized so that it is located in the center of the
It may become impossible to recognize the video content of the TR section.

Accordingly, in the case of such embedding synthesis, the present invention appropriately reduces the video screen of the VTR section and embeds the images.

Hereinafter, the embedding and compositing operation accompanied by screen reduction according to the present invention will be explained with reference to FIG. 3.

In addition, for the inset synthesis, the video screen of the VTR unit in Figure 3(a) is reduced to 1/2 (174 in area) and inserted into the lower right corner of the video screen of the camera unit in Figure 3(C). Let's take a case as an example.

The write control unit 3 changes the OH of the video screen of the VTR unit to 256H of the video memory and the OV
A shift is given to the write address so that it is written to 128V, and at the same time, every other horizontal and vertical address on the video screen of the VTR section is thinned out using a thinning control signal (for example, odd addresses are thinned out). As a result, the video screen of the VTR unit is written in the lower right corner of the video memory 2 in a reduced size of 172 (174 in area) as shown in FIG. 3(b).

In the synthesis unit 6, the read address 256H to 511H
, 128V to 255V, the video signal of the VTR unit read from the video memory 2 is selected and output, and in other address areas, the video signal of the camera unit is selected and outputted. Control takes place.

Therefore, the composite screen obtained by the composite section 6 is as shown in FIG.
d) In the lower right corner of the video screen of the camera unit, there is a 17
2. The reduced video screen of the VTR section becomes an embedded screen, and the peripheral part of the central subject "A" on the video screen of the VTR section is no longer missing.

Note that the above reduction rate can be determined as an appropriate value based on the proportion of the area where the video screen of the VTR section is fitted and the allowable loss amount, and the fitting position can also be determined arbitrarily, and The fitting position can also be changed. Further, by performing spatial interpolation processing, an arbitrary reduction ratio can be obtained, and enlargement processing may be performed if necessary.

Further, the reduction/enlargement ratio can be made different horizontally and vertically.

In the above embodiment, the writing side address of the video memory is shifted and controlled under the control of the write control unit 3, but the same effect can be achieved by controlling the readout side address by the readout control unit 4. can do.

b [Effects of the Invention] As explained above, according to the present invention, it is possible to realize a screen composition function in a general household camera-integrated magnetic recording and reproducing device without using an expensive device such as a frame synchronizer, and It is now possible to synthesize images so that the central subject part of each screen to be synthesized is located in the center of each screen area of the composite image,
This type of camera-integrated magnetic recording and reproducing device can perform new video expressions that were previously impossible.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing one embodiment of the camera-integrated magnetic recording and reproducing device according to the present invention, Fig. 2 is an explanatory diagram of one-screen composition by left-right division according to the present invention, and Fig. 3 is a reduction embedding according to the present invention. FIG. 4 is an explanatory diagram of one-screen compositing by left-right division when no address shift is given, and FIG. 5 is an explanatory diagram of one-screen compositing by fitting when no reduction is given. DESCRIPTION OF SYMBOLS 1... A/D conversion part, 2... Video memory, 3... Write control part, 4... Read control part, 5... A/D
Conversion unit, 6... synthesis section, 7... encoder section. Patent applicant: Pioneer Corporation, Figure 2, Figure 3m

Claims (2)

[Claims] (1) The write address is defined by the synchronization signal of the first video signal input as the write video signal, and the read address can be defined by at least the synchronization signal of the second video signal from the camera unit, A video memory capable of simultaneously and asynchronously writing/reading the first video signal, and mixing/selecting and outputting the first video signal read from the video memory and the second video signal from the camera unit. A built-in video memory device is provided with a compositing section for compositing the video screen of the first video signal and the video screen of the second video signal. What is claimed is: 1. A camera-integrated magnetic recording and reproducing device, characterized in that a memory address of a video memory is controlled such that the video memory is located at the center of the video screen area in a composite screen. (2) The device according to claim (1), characterized in that the writing address of the first video signal is shifted and the data of the first video signal is thinned out in accordance with the area ratio of screen composition. Camera-integrated magnetic recording and reproducing device.