KR0174947B1 - Still image recording apparatus using variable speed shutter of camcorder - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a still image recording apparatus using a variable speed shutter of a camcorder capable of recording a still image in an optimal shutter state by capturing a subject while varying a shutter speed. A photoelectric conversion unit (301) for repeating an operation of photographing a subject and converting an optical image of the subject into an electrical signal by varying the shutter speed at a predetermined number of times, and recording the same on a recording medium. The composite image signal generation unit 303 for generating a composite image signal using the subject information converted into the electrical signal by the conversion unit 301, the PCM conversion unit 304 for PCM converting the composite image signal, and the different A plurality of memories (30) for storing the PCM signal of each object information photographed at the shutter speed corresponding to each of the same shutter speed (30) 5a, 305b, 305c), a tape 308 for recording PCM signals stored in the plurality of memories 305a, 305b, 305c, respectively, and the same shutter for PCM signals of the respective subject information photographed at different shutter speeds. The memory is controlled to be stored in the plurality of memories 305a, 305b, and 305c corresponding to each speed, and one of the PCM signals of the subject information photographed at different shutter speeds stored in the plurality of memories 305a, 305b, and 305c, respectively. And a deck unit 309 for controlling to select and output the control unit 310 and the PCM signal selected by the control unit 310 to be recorded on the tape 308.

Description

Still image recording device using camcorder's variable speed shutter

1 is a schematic configuration diagram showing a general solid-state imaging device.

2 is an operation explanatory diagram showing the operation of the solid-state imaging device according to the shutter speed.

3 is a detailed configuration diagram showing a preferred embodiment of the present invention.

4 is a view for explaining the operation of the solid-state imaging device according to a preferred embodiment of the present invention.

5 is a view for explaining the operation of the deck portion of FIG.

* Explanation of symbols for main parts of the drawings

301 photoelectric conversion unit 302 driving unit

303: NTSC composite video signal generation unit 304: PCM conversion unit

305a to 305c: memory 306,307: switching unit

308 tape 309 deck portion

310: control unit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a still image recording apparatus using a variable speed shutter of a camcorder, in particular capable of recording a subject in an optimum shutter state by photographing a subject while varying a shutter speed.

In general, a camcorder is an apparatus for converting an optical image of a subject into an electrical signal using an imaging device such as a charge coupled device (hereinafter referred to as a CCD), and recording and reproducing the same on a recording medium. The following description will be made with reference to FIG. 2.

First, the solid-state imaging device generates photoelectric charges first incident by using an imaging tube and a photoelectric effect, and temporarily stores them in a small capacitance forming pixels, and then reads them by a solid scanning method. It is equipped with three basic functions called injection. Therefore, in the solid-state imaging device, as shown in FIG. 1, a plurality of photoelectric conversion elements 11 such as photodiodes and the like are formed in a matrix structure to accumulate photocharges using the photoelectric conversion elements, and then the vertical transfer control signal 12 Vertically transfer charges accumulated in each photoelectric change element 11 by means of horizontal transfer, and horizontally transfer charges vertically transferred by the horizontal transfer control signal 13 to a signal processing device (not shown in the drawing) at a later stage. do.

At this time, when the vertical transmission control signal occurs at intervals of 1/60 second as shown in FIG. 2 (a), each photoelectric conversion element 11 is operated for 1/60 seconds as shown in FIG. 2 (b). After accumulating the photo charge, a high transfer of the vertical transfer control signal 12 is applied, which is generally referred to as the standard mode. The solid-state imaging device, on the other hand, has an electronic shutter function that can be varied without limiting the accumulation time of electric charge by light to 1/60 second. To this end, a shutter speed control signal 14 is applied to cause the charges accumulated in each photoelectric change element 11 to be discharged to the ground point GRD.

2 (c) and (d) show a case of a shutter speed of 1/240 seconds in which photoelectric charges accumulate for 1/240 seconds and then transmit it. That is, after charges accumulated in the photoelectric conversion element 11 are transferred by the vertical transfer control signal 12, photocharges are accumulated in the photoelectric conversion element 11 again. It is emitted to the ground point GRD by the shutter speed control signal 14 applied to the photoelectric conversion element 11. The shutter speed control signal 14 is kept high for 3/240 seconds immediately after all the charges accumulated in the photoelectric conversion element 11 are transferred by the vertical transfer control signal 12, thereby for 3/240 seconds. All charges accumulated in the photoelectric conversion element 11 are released to the ground contact GRD. Charge is accumulated in the photoelectric conversion element 11 during 1/240 seconds when both the vertical transfer control signal 12 and the shutter speed control signal 14 remain low, and the charge accumulated during the 1/240 second charge is vertical transfer control. The charge transferred vertically by the horizontal transfer control signal 13 after the vertical transfer while the signal 12 remains high is transferred horizontally to a signal processing device (not shown in the figure) at a later stage.

As can be seen from the electronic shutter speed control of 1/240 seconds exemplified above, the conventional camcorder is 1/60 second, 1/100 second, 1/250 second, 1/1000 second by the shutter speed control signal 14. And electronic shutter functions such as 1/2000 sec, 1/4000 sec, etc., to capture a moving subject at a shutter speed desired by the user, and then record and reproduce still image information of the photographed subject on a recording medium.

However, since such a conventional camcorder shoots a subject at a single shutter speed by selecting only one of various shutter speeds, when shooting a subject by adjusting the shutter speed according to the movement of the subject, the still image information of the moving subject is used as the optimum shutter speed. There was a problem in that it had to rely solely on the user's experience and sensations.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and a still image recording apparatus using a variable-speed shutter of a camcorder capable of recording a moving subject while recording a moving subject while continuously changing a shutter speed, and recording a still image photographed in an optimal shutter state. The purpose is to provide.

In order to achieve the above object, the present invention provides a camcorder for converting an optical image of a subject into an electrical signal and recording the same on an recording medium. A photoelectric conversion unit repeatedly performing the conversion operation, a composite video signal generation unit generating a composite video signal by using the object information converted into an electrical signal by the photoelectric conversion unit, and PCM conversion of the composite video signal by PCM conversion. And a plurality of memories for storing PCM signals of the subject information photographed at different shutter speeds corresponding to the same shutter speed, a tape for recording PCM signals stored in the plurality of memories, and the different shutters. Each PCM signal of the subject information photographed at the A controller which controls to be stored in a plurality of memories and selects and outputs one of the PCM signals of each subject information photographed at different shutter speeds stored in the plurality of memories, and the PCM signal selected by the controller is output to the tape. And a deck portion for controlling to be recorded.

The above and other objects and features of the present invention will become more apparent from the following description of the preferred embodiments provided in connection with the accompanying drawings.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

3 shows a preferred embodiment of the still picture recording apparatus using the variable speed shutter of the camcorder of the present invention.

As shown in the figure, a still image recording apparatus using a variable speed shutter of a camcorder includes a photoelectric conversion unit 301 including a plurality of photoelectric conversion elements having a matrix structure, a driving unit 302 for driving the photoelectric conversion unit 301, The composite image signal generator 303 for generating a composite image signal by using the subject information converted into the electrical signal by the photoelectric converter 301, and the PCM converter 304 for performing pulse code modulation (PCM) conversion of the composite image signal. ), A plurality of memories 305a, 305b, and 305c configured in parallel to store the PCM-converted video signal, switching units 306 and 307 connected to the input and output terminals of the plurality of memories 305a, 305b, and 305c, respectively. Tape 308 for recording the PCM video signal stored in the memory 305a, 305b, 305c to the PCM channel 308a, Deck portion 309 for controlling the video signal to be recorded on the tape 308, and driver 302 ) Drive action and switch And a control unit 310 for controlling the switching operation unit, the plurality of the memory (305a, 305b, 305c) each of the read (read) / write (write) operation and a deck portion 309 of (306 307).

When a still image recording mode signal is applied to the controller 310 to continuously photograph the subject while the shutter speed is continuously changed through the line L1, the controller 310 is converted to the still image recording mode, and the result is transmitted to the driver 302. Provide a drive signal to the driver 302 via the line L2, the driver 302 outputs a vertical transmission control signal on the line L3, and a horizontal transmission control signal on the line L4. The controller 310 outputs a variable shutter speed control signal for continuously controlling the shutter speed on the line L5 for a preset number of times, and the driver 302 receives the signal to receive the line L13. ) Outputs the CCD control signal for the variable speed shutter.

FIG. 4 illustrates a case in which the shutter speed is continuously changed three times (1/60 sec., 1/120 sec., 1/240 sec.) By the variable shutter speed control signal, and the image is repeatedly repeated.

The driving unit 302 is driven by a driving signal applied through the line L2, and thus the photoelectric conversion unit 301 by the vertical transmission control signal through the lines L3 and L13 and the CCD control signal for the variable speed shutter. ) Photograph the subject. In addition, as illustrated, the photoelectric conversion elements of the photoelectric conversion unit 301 may transmit light to each photoelectric conversion element for 1/60 second after the charge accumulated by the vertical transfer control signal applied through the line L3 is transferred. After the charges are accumulated (Fig. 4 (c)), the accumulated charge is transferred to the photoelectric conversion element by the vertical transfer control signal (Fig. 4 (a)). Subsequently, when the variable shutter speed control signal (FIG. 4B) that maintains the high state for 1/120 second is applied to the photoelectric conversion unit 301 through the line L5, the charge accumulated in the photoelectric conversion element is high. By the shutter speed control signal of the state, it is emitted to the ground point GRD for 1/120 second. While the vertical transfer control signal and the variable shutter speed control signal are both held low for 1/120 sec, charges are accumulated in the photoelectric conversion element, and the charge accumulated during 1/120 sec is maintained while the vertical transfer control signal remains high. Vertical transfer. Subsequently, when the variable shutter speed control signal (Fig. 4 (b)) which remains high for 3/240 seconds is applied to the photoelectric conversion section 301 through the line L5, the charge accumulated in the photoelectric conversion element is high. By the shutter speed control signal in the state, it is emitted to the ground point GRD for 3/240 seconds. While the vertical transfer control signal and the variable shutter speed control signal both remain low for 1/240 seconds, charges accumulate in the photoelectric conversion element, and the charge accumulated for 1/240 second while the vertical transfer control signal remains high. Vertical transfer.

When the charge accumulated in the photoelectric conversion element is vertically transferred by the vertical transfer control signal as described above, the photoelectric conversion unit 301 returns the same through the line L6 by the horizontal transfer control signal input through the line L4. The composite image signal generator 303 is horizontally transferred.

Although the shutter speed is continuously changed three times by 1/60 sec, 1/120 sec, and 1/240 sec by the variable shutter speed control signal, the photographing of the subject is repeated and repeated. Those skilled in the art will recognize that the shutter speed or the variable number of the shutter speeds may be variously implemented without being limited thereto.

Meanwhile, the composite video signal generator 303 is for generating an NTSC composite video signal by using the electric subject information applied through the line L6. The automatic video signal generator 303a, the signal processor 303b, and the encoder The part 303c is provided.

The automatic gain controller 303a automatically adjusts the gain of the electrical subject information applied through the line L6 to output the signal processor 303b, and the signal processor 303b matrixes the electrical subject information. After the luminance signal and the color difference signal are formed, the luminance signal is output through the line L7 and the color difference signal is output through the line L8. In addition, the encoder unit 303c inserts horizontal and vertical synchronization signals into the luminance signal and the color difference signal applied through the lines L7 and L8 to form an NTSC composite video signal.

The NTSC composite video signal of encoder 303c is applied to PCM converter 304 via line L9. The PCM converter 304 samples the NTSC composite video signal at a predetermined frequency interval and quantizes it to perform PCM conversion. The reason for the PCM conversion of the NTSC composite video signal is to record the PCM signal in which the NTSC composite video signal is PCM converted to the PCM channel 308a of the 8mm VCR tape 308 which will be described later.

The PCM signal of the PCM converter 304 is applied to the switch 306 via line L10 and then stored in the memory selected by the switch 306. That is, the controller 310 detects a shutter speed that continuously varies from 1 to 60 seconds, 1/120 seconds, and 1/240 seconds by the photoelectric conversion unit 301 by the variable shutter speed control signal applied through the line L5. After that, the PCM signal corresponding to the subject information photographed at the shutter speed of 1/60 second by controlling the switching unit 306 corresponds to the subject information photographed at the shutter speed of 1/120 second to the memory 305a, for example. For example, the PCM signal may be stored in the memory 305b, and the PCM signal corresponding to the subject information photographed at a shutter speed of 1/2400 seconds may be stored, for example, in the memory 305c. The write control of 305c is performed through the line L11.

Therefore, each memory 305a, 305b, or 305c of the camcorder according to the preferred embodiment of the present invention stores PCM signals corresponding to subject information photographed at different shutter speeds.

The subject photographed at the desired shutter speed through the line L12 at the desired shutter speed in the state where the shooting is completed after repeated operation of continuously changing the shutter speed for a predetermined number of times by the variable shutter speed control signal as described above. When a control signal is applied so that the PCM signal corresponding to the information is recorded on the tape 308, the controller 308 controls the switching unit 307 to store the PCM signal corresponding to the object information photographed at a desired shutter speed. And line L13 are connected.

For example, if a control signal is applied to the control unit 310 to record the PCM signal corresponding to the subject information photographed at a shutter speed of 1/60 second via the line L12 to the tape 308, the control unit 308. The controller controls the switching unit 307 such that the memory 305a and the line L13, which store the PCM signal corresponding to the photographed subject information at a shutter speed of 1/60 second, are connected, and the control unit 310 through the line L12. When a control signal is applied so that the PCM signal corresponding to the object information photographed at the shutter speed of 1/120 sec is applied to the tape 308, the controller 308 corresponds to the subject information photographed at the shutter speed of 1/120 sec. The switching unit 307 is controlled to connect the memory 305b in which the PCM signal is stored to the line L13, and corresponds to the subject information photographed at a shutter speed of 1/240 seconds to the controller 310 through the line L12. When a control signal is applied to allow the PCM signal to be recorded on the tape 308, Fisherman 308 controls the switching unit 307 so that the memory (305c) and the line (L13), a PCM signal corresponding to the stored object information recorded with 1/240 second shutter speed is connected. Read control of each of the memories 305a, 305b, and 305c is performed through the line L11.

Of the PCM signals corresponding to the subject information stored in each of the memories 305a, 305b, and 305c, the PCM signal of the memory selected by the switching unit 307 is applied to the deck unit 309 via the line L13. The deck unit 309 writes the PCM signal applied through the switching unit 307 to the PCM channel 308a on the 8mm VCR tape 308.

At this time, the PCM signal recording method according to a preferred embodiment of the present invention is possible by adjusting the winding degree of the 8mm VCR tape 308 wound on the rotary drum 501 as shown in FIG.

That is, in general, the drum of the deck portion 309 rotates 30 times per second, and two heads are assigned to the 180 ° position on the drum, and recording is performed by the head. The tape is also wound around the rotating drum by 180 °. Therefore, one field of video information is continuously recorded on the tape as an inclined track.

According to a preferred embodiment of the present invention, the tape 308 is wound around the rotating drum 501, for example, by 210 °, in order to record the PCM signal to the PCM channel 308a on the tape 308. In this case, image information is recorded in the general channel 308b of the tape 308 in the 0 ° -180 ° winding section of the tape 308, and in the 180 ° -210 ° winding section of the tape 308 in the tape 308 section. Video information is recorded in the PCM channel 308a.

Therefore, the control unit 310 provides the PCM channel recording signal to the deck unit 309 through the line L14. When the deck unit 309 receives the PCM channel recording signal from the line L14, the PCM signal stored in the memory selected by the switching unit 307 is recorded in the 180 ° -210 ° winding interval of the tape 308. The PCM signal stored in the memory selected by the switching unit 307 is recorded in the PCM channel 308a of the tape 308.

As described above, according to the present invention, after photographing a moving subject while continuously changing a shutter speed, the subject information recorded at each shutter speed is stored in a memory, and the subject information recorded at a desired shutter speed is recorded. This has the effect of recording still images taken in the shutter state.

The present invention is not limited to the above-described preferred embodiments, it should be understood that the above-described preferred embodiments are only for illustrating the present invention. Therefore, the scope of the invention should be construed by the claims as defined by the drawings and specification described above.

Claims (4)

A camcorder for converting an optical image of a subject into an electrical signal and recording the same on a recording medium. A unit 301, a composite image signal generation unit 303 for generating a composite image signal by using the subject information converted into an electrical signal by the photoelectric conversion unit 301, PCM conversion unit for PCM conversion of the composite image signal 304, a plurality of memories 305a, 305b, and 305c for storing PCM signals of the subject information photographed at different shutter speeds corresponding to the same shutter speed, respectively, and the respective photographed images at different shutter speeds. The PCM signal of the subject information is controlled to be stored in the plurality of memories 305a, 305b, and 305c corresponding to the same shutter speed, respectively, and the plurality of memories 305a and 305b. A control unit 310 for controlling to select and output one of the PCM signals of the subject information photographed at different shutter speeds respectively stored at 305c) and controlling the PCM signal selected by the control unit 310 to be recorded on the recording medium A still picture recording apparatus using a variable speed shutter of a camcorder having a deck section (309). The method of claim 1, wherein the plurality of PCM signals of the subject information photographed at different shutter speeds output from the PCM converter 304 under the control of the controller 310 correspond to each of the plurality of shutter speeds. First switching unit 306 for switching to be stored in the memory (305a, 305b, 305c), the photographing at different shutter speeds stored in the plurality of memory (305a, 305b, 305c) under the control of the controller 310 And a second switching unit (307) which selects one of the PCM signals of the respective subject information and provides the deck unit (309) to the deck unit (309). The still picture recording apparatus according to claim 1 or 2, wherein the recording medium is an 8mm VCR tape. 4. The still image recording apparatus according to claim 3, wherein the deck unit (309) controls the PCM signal selected by the control unit (310) to be recorded on the PCM channel of the 8mm VCR tape.