JPH05183866A - 8mm video camera - Google Patents

Abstract

PURPOSE:To record an image so that an image of 4:3 in aspect ratio can be displayed on a 4:3 aspect ratio monitor and an image of 16:9 in aspect ratio which has no deterioration in resolution can be displayed on a 16:9 aspect ratio monitor. CONSTITUTION:An image pickup signal is read out of a 16:9 aspect ratio CCD 12 at intervals of 1/60 second and divided by a switch circuit 20 into center main video data of 4:3 in aspect ratio and its right and left subordinate video data after A/D conversion. Then the main video data are expanded by a main video time expanding circuit 22 horizontally with time to generate video data of one field, which are recorded in a video recording area of a video tape by a main video recording circuit 30 after D/A conversion. The subordinate video data are inputted to a subordinate video time compressing circuit 24, which compresses the right and left data to half horizontally with time and arranges them; and they are recorded in a PCM audio recording area of the video tape by a subordinate video recording circuit 38 after D/A conversion.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an 8 mm video camera, and more particularly to an 8 mm video camera for shooting and recording an image having an aspect ratio of 16: 9.

[0002]

2. Description of the Related Art In recent years, as a next-generation television receiver, a television receiver having a screen with an aspect ratio of 16: 9 has appeared. As a method for easily shooting such an image with an aspect ratio of 16: 9 using a home video camera, a special lens such as an anamorphic lens is attached, and an image with an aspect ratio of 16: 9 is optically converted to an aspect ratio of 4: 9. A method of compressing to 3 and recording is considered. This compressed and recorded image is displayed as an image having an aspect ratio of 16: 9 on a television receiver having an aspect ratio of 16: 9.

[0003]

However, the compressed and recorded video is reproduced vertically compressed in a current television receiver having an aspect ratio of 4: 3, and the correct content cannot be viewed. There was a point. Furthermore, when an image with an aspect ratio of 16: 9 is captured in a CCD with an aspect ratio of 4: 3, the horizontal resolution deteriorates due to the number of pixels of the CCD.

Therefore, the main object of the present invention is to record an image so that the correct content can be displayed on a monitor with an aspect ratio of 4: 3, and also to record an image with an aspect ratio of 16: 9 without deterioration of horizontal resolution. , 8mm video camera.

[0005]

According to the present invention, a CCD having an aspect ratio of 16: 9 and a CCD having an aspect ratio of 16: 9 are used.
The reading means for reading out the video signal of 9 every 1/60 second, the video of the aspect ratio of 16: 9 read by the reading means for the main video of the central aspect ratio of 4: 3 and the remaining left and right parts. The dividing means for dividing as a sub-picture, the horizontal time expanding means for expanding the main video in the horizontal time, the time compressing means for time-compressing the sub-picture by 1/2, and the main picture horizontally expanded by the horizontal time expanding means for 8 V
According to the TR standard, the first recording means for recording in the video recording area on the video tape and the time compression means 1 /
2 mm time-compressed sub-picture with 8 mm VTR standard PC
A second recording means for recording in the M audio recording area,
It is an 8 mm video camera.

[0006]

The image pickup signal from the CCD having the aspect ratio of 16: 9 is read by the reading means every 1/60 seconds, that is, every one field. Then, after A / D conversion, the image having an aspect ratio of 16: 9 is divided by a dividing means into a main image having an aspect ratio of 4: 3 at the center and the remaining sub-images on the left and right sides thereof. By the horizontal time axis expansion means, the main video can be stored in the video recording area for 180 ° of the rotation angle of the rotary head on the video tape, that is, the video recording area for one field according to the standard of 8 mm VTR. The horizontal time axis is extended. In this horizontal time axis expansion means, for example, the main video data is expanded by writing it in the memory and reading it with a clock having a frequency of 3/4 times the write clock. Then, it is recorded in the video recording area on the video tape by the first recording means. Also, the sub video data is PCM on the video tape.
Voice recording area, that is, 30 of the rotation angle of the rotary head
The time is compressed by the time compression means in order to record in the recording area of ° minutes. In the time compression means, the sub video data is, for example, 1 / of the clock used at the time of A / D conversion.
By subsampling with a clock with a frequency of 2, the memory is thinned to 1/2 and written to the memory A
The data is read from the memory at the same clock as the clock used at the time of / D conversion, so that the data becomes 1/2 compressed in the horizontal direction. Then, by the second recording means,
It is recorded in the PCM audio recording area on the video tape.
By the video signal recorded on the video tape in this way,
Images with an aspect ratio of 16: 9 can be displayed on a monitor with an aspect ratio of 16: 9, and only main images with an aspect ratio of 4: 3 can be displayed on a monitor with an aspect ratio of 4: 3.

[0007]

According to the present invention, the aspect ratio is 16:
The image is captured by the CCD of 9 and the aspect ratio is 16:
An image with an aspect ratio of 16: 9 is displayed on a monitor with 9 aspect ratio, and only a main image with an aspect ratio of 4: 3 is displayed on a monitor with an aspect ratio of 4: 3. It is possible to record an image with an aspect ratio of 16: 9 without deterioration of the horizontal resolution while maintaining compatibility with the monitor.

The above-mentioned objects, other objects, features and advantages of the present invention will become more apparent from the detailed description of the embodiments below with reference to the drawings.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to FIG. 1, an 8 mm video camera 10 of this embodiment includes a CCD 12 having an aspect ratio of 16: 9. Then, a video signal having an aspect ratio of 16: 9 is fetched from the CCD 12 by the CCD control circuit 14 every 1/60 seconds, that is, every one field, and the A / D converter 1
6 is input. In the A / D converter 16, the clock signal CLK3 created by the timing control circuit 18 causes
The video signal is converted into digital video data. The timing control circuit 18 produces clock signals CLK1 and CLK2 in addition to the clock signal CLK3. The clock signal CLK1 is an integral multiple of the horizontal frequency of the video signal, and the clock signals CLK1, CLK2, and CLK3.
The frequency relationship of each is as shown in Equation 1.

[0010]

F _CLK3 = f _CLK1 × _4/3 f _CLK2 = f _CLK3 / 2 Then, the output from the A / D converter 16 is the switch circuit 2
Input to 0. The switch circuit 20 is supplied with a control signal generated from the timing control circuit 18 based on the horizontal synchronizing signal. Therefore, in response to the control signal, the switch circuit 20 applies the main video data having the aspect ratio of 4: 3 at the central portion of the video data having the aspect ratio of 16: 9 to the main video time decompression circuit 22 so that the left and right of the main video can be displayed. And sends the sub-picture data to the sub-picture time compression circuit 24.

The main video time expansion circuit 22 includes a field memory 26 (field memory A), and the main video data input to the main video time expansion circuit 22 is a clock signal CLK supplied from the timing control circuit 18.
3 is used as a clock to be written in the field memory 26. At this time, the writing is 1 for the main video data.
It is performed for each horizontal line. If the number of scanning lines in one field period is four for simplification, the main video data for one field consisting of four scanning lines is written in the field memory 26 at the timing shown in FIG.

On the other hand, at the time of reading from the field memory 26, as shown in Formula 1, the clock signal CLK1 having a frequency of 3/4 times the clock signal CLK3 is used as a clock to generate a main image in the field memory 26 for one field period. Read data continuously. Therefore, as shown in FIG. 2, the main video data for one field which is horizontally expanded by 4/3 is read. Then, this main video data is input to the D / A converter 28 and is D / A converted using the same clock signal CLK1 as that used when reading the main video data from the field memory 26 as a clock.

With the above processing, the main image can be displayed by using the conventional CCD having the aspect ratio of 4: 3.
It is possible to obtain a video signal that is exactly the same as the video signal taken out every 60 seconds. Then, the main video signal output from the D / A converter 28 is input to the main video recording circuit 30. In the sub video time compression circuit 24, the switch 2
The sub video data selected by 0 is input to the sub sampling circuit 32. Then, it is sub-sampled by the clock signal CLK2 having a frequency half that of the clock signal CLK3 created by the timing control circuit 18, and
The left and right sub-picture data in the horizontal period are thinned out to 1/2 and written in the field memory 34 (field memory B). At this time, the sub video data is written using the clock signal CLK2 as a clock. by this,
As shown in FIG. 2, one field of sub-picture data, which is obtained by removing the main picture having the aspect ratio of 4: 3 from the picture data having the aspect ratio of 16: 9, is written in the field memory 34.

On the other hand, the sub video data is continuously read out by using the clock signal CLK3 as shown in FIG. 2 for all the sub video data for one field. Then, the D / A converter 36 converts the sub video data into an analog signal. As a result, the D / A converter outputs a sub video signal which is horizontally compressed to 1/2 and is input to the sub video recording circuit 38.

By these processes, the main image portion having the aspect ratio of 4: 3 and the left and right sub-pictures respectively compressed to 1/2 as shown in FIG. 3 from the image signal having the aspect ratio of 16: 9 input from the CCD 12. A part where video signals are arranged is created. The ratio of the main video portion and the sub video portion in one field is 6: 1, which is equal to the ratio of the video recording area and the PCM audio recording area of the 8 mm video tape described later.

In the main video recording circuit 30 and the sub recording circuit 38, the main video signal and the sub video signal are recorded on the tape by the first rotary head and the second rotary head (not shown) at the timings shown in FIG. That is,
As shown in FIG. 3, the main video signal is recorded in the video recording area of 180 ° at the recording angle of the rotary head in the 8 mm VTR standard, and the sub video signal is recorded in the PCM audio recording area of 30 °.

The above processing is performed for a part of the luminance signal, for example, but the same processing is performed in parallel for the color signal. Also, a normal 8mm VTR Y
The / C signal processing and the synchronization signal processing are naturally performed. Further, although the above-described processing is from CCD input to recording on the tape, the method of reproducing from the tape and the method of assembling the image having the aspect ratio of 16: 9 from the main image and the sub-image are completely opposite processes.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a timing diagram showing a write timing, a read timing, and a video tape recording timing for the field memory shown in FIG.

FIG. 3 is an illustrative view showing a state of division of an image having an aspect ratio of 16: 9 and a recording position on a video tape.

[Explanation of symbols]

 10 ... 8 mm video camera 12 ... CCD 14 ... CCD control circuit 18 ... Timing control circuit 20 ... Switch circuit 22 ... Main video time expansion circuit 24 ... Sub video time compression circuit 26, 34 ... Field memory 30 ... Main video recording circuit 32 ... Subsampling circuit 38 ... Sub video recording circuit

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location // H04N 5/335 Z 4228-5C

Claims (1)

[Claims] 1. A CCD having an aspect ratio of 16: 9, and 1 / a video signal having an aspect ratio of 16: 9 from the CCD.
Read-out means for reading out every 60 seconds; aspect ratio 16 read out by the read-out means:
A dividing unit that divides the image No. 9 into a main image in the central aspect ratio 4: 3 and sub-images in the left and right remaining portions; a horizontal time extending unit that horizontally extends the main image; Time compression means for time compression to 1/2, first recording means for recording the main video horizontally expanded by the horizontal time expansion means in a video recording area on a video tape according to the 8 mm VTR standard, and the time compression An 8 mm video camera provided with a second recording means for recording the sub-image time-compressed to 1/2 by the means in a PCM audio recording area of 8 mm VTR standard.