JP3074711B2 - Video camera - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video camera capable of taking high-quality still images in addition to moving images.

[Summary of the Invention] The present invention is configured so that a moving image mode and a still image mode can be selected. In the still image mode, three color signals are recorded on a tape using three times the area of the moving image mode, so that the video signal and the moving image mode can be selected. A still image of high quality and a sufficient number of still images can be taken.

[Problems to be Solved by the Related Art] An electronic still camera which records a still image video signal on a disc has a good image quality because the color signal frequency band is about 1 MHz, but the number of recorded images is limited to 50. ing. A general video camera that records a video signal of a moving image on a tape has a color signal frequency band of about 500 KHz, and has a poor image quality as a still image. Therefore, in the present situation, when it is desired to take both a still image and a moving image, it is necessary to carry both an electronic still camera (or a silver halide film camera) and a video camera.

Accordingly, an object of the present invention is to provide a video camera capable of taking a high-quality and sufficient number of still images together with a moving image.

[Means for Solving the Problem] A video camera according to the present invention for solving the above-mentioned problems includes:
The video mode and the still image mode are configured to be selectable. In the video mode, a video signal representing one image is sequentially recorded on a tape using a fixed area, and in the still image mode, the video signal representing one image is recorded. With three color signals, each of the color signals is divided for each of the predetermined areas and recorded on a tape,
In the moving image mode, the first captured image is recorded by dividing the above three color signals into respective fixed areas sequentially, and then sequentially recording on tape using the video signal in the fixed area. I have.

[Operation] When the moving image mode is selected, if the fixed area is one track, the video signal of one image per track is sequentially recorded, and if the still image mode is selected, the image signal of one image is recorded. Since three color signals are recorded using three tracks, the image quality is high, and a sufficient number of images can be recorded for recording on a tape. In particular, according to the present invention, in the moving image mode, the first captured image is recorded by dividing each of the three color signals into a predetermined area, so that a high-quality image is always recorded at the head of the moving image. It is more valuable than electronic still cameras as a substitute for photography.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

1 to 3 show an example in which the present invention is applied to an 8 m / m video camera. FIG. 1 is a circuit block diagram of a recording system, FIG. 2 is a block diagram of a reproducing system, and FIG. The figure shows an explanatory diagram of the operation at the time of recording.

In FIG. 1, a solid-state imaging device unit 1 has three imaging units, and each imaging unit outputs an R signal (red), a G signal (green), and a B signal (blue) to an A / D converter 2. I do. The output of the A / D converter 2 is transferred to the memory 4 via the camera process circuit 3.
It is taken in. The writing / reading of the memory 4 is controlled by the system controller 5, and the R signal, the G signal and the B signal are simultaneously read in the moving image mode, and are read in the order of the R signal, the G signal and the B signal in the still image mode.
The R signal is led respectively G and B signals are first each a changeover switch SW ₁ with being supplied to the arithmetic circuit 7 together via a D / A converter 6, b, the terminal c . The arithmetic circuit 7 converts the luminance signal (Y) and the color difference signal (RY, B
−Y), the luminance signal is supplied to the FM modulator 8, and the color difference signal is supplied to the low-frequency modulation circuit 9. The FM modulator 8 FM-modulates the luminance signal, the low-frequency conversion circuit 9 converts the color-difference signal into a low-frequency signal, and both signals are frequency-multiplexed by the adder 10 to obtain the signal m of the _second changeover switch SW2. It is led to the terminal.
The first changeover switch SW ₁ is switching control by the system controller 5, a terminal, b terminals in synchronization with the vertical synchronizing signal to the still-picture mode is switched in the order of the terminal c.
The output of the first changeover switch SW ₁ is supplied to the FM modulator 11, where FM modulated signal second changeover switch SW
It is led to the s terminal of ₂ . The second changeover switch SW ₂ is switching control by the system controller 5, the m terminal when the video mode is selected, are connected to the s terminal when the still picture mode is selected. The second video signal selected by the changeover switch SW ₂ is recorded on the tape 12 by the recording head H _1. Recording head H ₁ records one field worth of image (single image) on one track (constant region). The recording button 13 is biased to the off side, and is configured to be turned on by being depressed against the biasing force. An on / off signal of the recording button 13 is input to the mode determination circuit 14. The mode discriminating circuit 14 has a timer, and discriminates that the still image mode is selected when the ON signal is input only for a moment, and that the moving image mode is selected when the ON signal is input for a longer time. I do. The determination result is output to the system controller 5, the system controller 5 controls the determination result changeover switch SW ₁ of the read and the first and second memory 4 as described above depending on, for SW ₂ switching.

 Hereinafter, the operation of the above configuration will be described with reference to FIG.

When the record button 13 is pressed for a moment (A in FIG. 3),
It is determined that the still image mode has been selected, and the R, G, and B signals for one field recorded in the memory 4 are read out in this order in a time-division manner. Then, the period in a terminal of the first changeover switch SW ₁ is a vertical synchronizing signal, b terminal, switched connections in the order of the terminal c, the second R signals of each single field of via the switch SW _2, The G signal and the B signal are sequentially recorded using one track. next,
Press the record button 13 again for a moment (B in FIG. 3)
Then, the R signal, G signal and B signal for one field are recorded on three tracks in the same manner as described above. Therefore, in the still image mode, a high-band image (for example, a 5 MHz band for each color) is recorded. Next, when the recording button 13 is kept pressed for several seconds (C in FIG. 3), it is determined that the moving image mode has been selected. Similarly to the image mode, the R signal, the G signal, and the B signal are sequentially divided into fixed areas using one track, and are recorded. Thereafter, the R signal, the G signal, and the B signal for one field recorded in the memory 4 are recorded. The signals are read synchronously at once. The frequency superimposed one field of the video signal of a luminance signal and color difference signals via an arithmetic circuit 7, etc. are recorded on one track by the recording head H ₁ via the second changeover switch SW _2. This operation is continued until the recording button 13 is depressed, and video signals for one field are sequentially recorded for each track.

FIG. 2 shows a reproduction system of the tape 12 recorded as described above, and a signal picked up by the reproduction head 12 is selectively supplied to a signal separation circuit 15 or an A / D converter via a _third changeover switch SW3. It is guided to the memory 17 via the converter 16 and also to the recording mode detection circuit 18. The recording mode detection circuit 18 detects the recording mode by determining whether the reproduced signal is a superimposed signal of a luminance signal and a color difference signal or a color signal. If the reproduced signal is a superimposed signal (moving image mode), the signal separation circuit 15 outputs a color signal. Memory when signal (still image mode)
Outputting a third control signal to switch the switch SW ₃ of the 17 side. The signal separation circuit 15 has a high-pass filter and a low-pass filter to separate into a luminance signal and a color difference signal,
The luminance signal is FM-demodulated by the FM modulator 18, and the color difference signal is returned to the original high band by the high-band conversion circuit 19. The memory 17 has a recording capacity for three fields, and stores R, G, and B signals for one field. Then, these color signals are output simultaneously in synchronization. Therefore, according to this reproduction system, not only signals stored in the moving image mode but also signals stored in the still image mode can be automatically reproduced.

In particular, in this embodiment, even when the moving image mode is selected, only the image first taken into the solid-state imaging device unit 1 is sequentially divided into a certain area by using each track of the R signal, the G signal, and the B signal. Since a high-quality image is always recorded at the head of a moving image, it is more valuable than an electronic still camera as a substitute for a photograph.

In the above embodiment, the signal for one field is recorded on one track, but the signal for one frame may be recorded on one track.

[Effects of the Invention] As described above, according to the present invention, a moving image mode and a still image mode are configured to be selectable, and three color signals are used in the still image mode using three times the area in the moving image mode. Since the recording is performed on the tape, a high quality and sufficient number of still images can be taken together with the moving image. In addition, in the moving image mode, the first captured image is recorded by dividing the above three color signals into respective fixed areas sequentially, so that a high-quality image is always recorded at the head of the moving image. It is more valuable than electronic still cameras as a substitute for photography.

[Brief description of the drawings]

1 to 3 show an embodiment of the present invention. FIG. 1 is a circuit block diagram of a recording system, FIG. 2 is a circuit block diagram of a reproducing system, and FIG. is there. 12 ... tape.

Claims (1)

(57) [Claims] A moving image mode and a still image mode are selectable. In the moving image mode, a video signal representing one image is sequentially recorded on a tape using a fixed area, and in the still image mode, one image signal is recorded. The video signal representing is divided into three color signals, and each color signal is divided into the above-mentioned fixed regions and recorded on the tape. In the moving image mode, the first captured image is divided into the above-mentioned three color signals sequentially into each fixed region. A video camera characterized in that the video signal is sequentially recorded on a tape using a certain area.