JP5149738B2 - Camera video recording apparatus and camera video recording method - Google Patents

Description

  The present invention relates to a video recording camera that records a camera video on a recording medium, and relates to a technique for recording an imaging signal even before recording preparation of the recording medium is completed.

  Television cameras include video recording cameras that not only capture images but also include recording devices such as VTRs. When recording with an image recording camera with a VTR, the VTR uses a video tape, and due to its structure, it takes time to recognize the tape, and the recording cannot be performed immediately after mounting.

  Here, the photographing operation of the conventional video recording camera will be described with reference to FIG. 5A and FIG. FIG. 5 (a) shows the state of the recording unit at the start of recording. After the power is turned on (power is turned on), there is a time for not accepting the recording start switch (standby) because there is a time required to recognize the recording medium even when the recording medium is loaded. After the standby is completed, the recording start button is pressed to start recording (during recording). Even after the subsequent recording stop, the standby time exists, and the power cannot be turned off until the standby is completed. FIG. 6A shows that recording is in progress. As can be seen from FIG. 6A, not only the recording medium (tape) cannot be replaced during recording, but also it takes time to take out the recording medium even when the stop switch is pressed.

  FIG. 5A and FIG. 6A are the same when the recording medium is not only a video tape but also a disk.

  Currently, there is a video recording camera that uses an IC memory (hereinafter also referred to as a memory pack) using a memory element instead of a video tape or a disk as a recording medium. Unlike a VTR or a disc, this video recording camera does not have a mechanical drive part, so that recording can be performed immediately after power-on or after mounting.

Further, as a known example of an imaging device using a disk, a technique is disclosed in which a video signal is compressed and recorded in an IC memory different from a recording medium (disk) while the disk starts recording (for example, , See Prior Literature 1).
JP 2006-332983 A

  In the conventional recording camera that performs the operations shown in FIGS. 5A and 6A, recording is stopped during recording, the recording medium is taken out, and another recording medium is inserted again to perform recording. When doing so, there is a possibility of missing the video at the time of the exchange. One cause of this is the problem that the recording preparation period of the recording apparatus is long. This can be solved by changing the recording medium to an IC memory.

Further, as described in Patent Document 1, there is a technique for recording a video during a recording preparation period in another IC memory and recording it on a recording medium after completion of the recording preparation. Patent Document 1 discloses a technique for calculating and recording a bit rate and a compression rate based on a remaining capacity of a buffer memory serving as an IC memory and a recording preparation period. This technique records a video signal being prepared for recording. It does not work when disc recording starts. In addition, since it takes time to calculate the bit rate and compression rate, there is a possibility that the response may be delayed when there is a scoop video.

  It is an object of the present invention to provide a camera video recording apparatus and a camera video recording method that can be recorded even when recording preparation is performed or when there is a scoop video, and even when there is no recording medium.

A camera video recording apparatus according to a first aspect of the present invention includes an encoding unit that encodes an imaging signal from a solid-state imaging device after camera signal processing, and a first recording medium that records the encoded imaging signal. When the insertion and removal possible second recording medium for recording and transfer the recording contents of the first recording medium, and detecting means for detecting the presence of the second recording medium, the first recording medium and A recording control unit for controlling the second recording medium, and when it is determined that the detection unit is present during recording preparation, the recording control unit performs control for causing the first recording medium to perform endless recording; When the recording means is determined to be absent during recording, the recording control means performs control for recording the first recording medium for a predetermined time, and when it is determined that the detection means is present during recording, The recording control means has the first description. Is operated as a buffer memory of the second recording medium on the medium, a predetermined recording capacity performs control to be transferred to the second recording medium for each, the first recording medium to record the second recording medium the content When transferring to the recording medium, control is performed so as to prohibit removal of the second recording medium .

The camera video recording apparatus according to the second aspect of the present invention is the camera video recording apparatus according to the first aspect of the present invention, wherein the recording control means records the content recorded on the first recording medium in the second mode. When recording is performed by transferring to a recording medium, the recording is controlled so as to be recorded at a speed twice as fast as the recording speed of the first recording medium.

The camera video recording method according to the first aspect of the present invention includes:
Endless recording to a first recording medium during recording preparation;
Canceling the recording preparation and transferring the recording content recorded on the first recording medium before starting recording to the second recording medium faster than the first recording medium records ;
Prohibiting removal of the second recording medium during the transfer;
Releasing the removal prohibition when the transfer is completed;
Detecting whether a predetermined capacity is recorded on the first recording medium;
When a predetermined capacity is recorded on the first recording medium, transferring the recording content to the second recording medium faster than the first recording medium records ;
It includes a step of detecting on / off of the take-off switch of the second recording medium and a step of recording on the first recording medium for a predetermined time when the take-off switch is turned on.

According to the camera video recording apparatus of the first aspect of the present invention and the camera video recording method of the first aspect of the present invention, recording is always performed on the first recording medium regardless of the presence or absence of the second recording medium. Has the effect of eliminating. Further, during recording preparation, the latest video is always saved by endless recording. When there is no second recording medium, recording for a predetermined time has an effect that a video signal for a predetermined time after being taken out can be stored. Further, by prohibiting the removal of the recording contents being prepared for recording from the first recording medium while being transferred to the second recording medium, the recording contents being prepared for recording are always stored in the second recording medium. Have.

According to the camera video recording apparatus of the second aspect of the present invention, since the transfer speed to the second recording medium is doubled, the access time to the second recording medium is shortened. The time for taking out the medium is widened, which is suitable for a cameraman who uses the camera.

  An example of an embodiment of the present invention will be described with reference to FIGS.

[Device configuration]
FIG. 1 is a block diagram of a camera video recording apparatus according to an embodiment of the present invention. A camera video recording apparatus shown in FIG. 1 includes a CCD (Charge Coupled Device) 10 that is a solid-state imaging device, a camera signal processing and encoding processing circuit 11, a memory device 12, a memory pack 13, and a memory pack presence / absence detection. A circuit 14, a recording control unit 15, and a liquid crystal panel 16 are provided.

  Next, the operation of each component will be described. The CCD 10 photoelectrically converts an optical signal into an electric signal.

  In an ordinary recording camera, three channels of RGB are used. However, in the embodiment of the present invention, since it is not a part closely related to the present invention, it will be described as one channel. A television camera reproduces a recorded video signal on a liquid crystal panel for confirmation. However, since the present invention is a recording apparatus, a video reproduction system is omitted.

  The camera signal processing and encoding processing circuit 11 performs camera signal processing such as knee and gamma on the output of the CCD 10, and encodes the obtained video signal with MPEG-2. The memory element 12 records the encoded video signal based on the control signal of the recording control unit 15, and transfers the recorded video signal to the memory pack 13. Since the memory element 12 is controlled to record a signal having a predetermined capacity or less based on the control signal of the recording control unit 15, a large-capacity memory element is not required. The control method of the recording control unit 15 will be described in detail later.

  The memory pack 13 records a video signal transferred from the memory element 12. The memory pack 13 has a larger capacity than the memory element 12 and is used as a main recording medium for recording video. That is, when the memory pack 13 is viewed as the main memory, the memory element 12 can be regarded as a buffer memory.

  The memory pack 13 is configured to be detachable from the camera video recording apparatus, and is configured to be exchangeable with a compatible memory pack 13.

  The memory pack presence / absence detection circuit 14 detects the presence / absence of the memory pack 13. The presence / absence is detected by comparison by, for example, writing to a predetermined address and reading the written data. Alternatively, the presence / absence of a memory pack is detected by reading and comparing data recorded in advance at a predetermined address.

  The detection result by the memory pack presence / absence detection circuit 14 is sent to the recording control unit 15 and used for controlling the memory element 12 and the memory pack 13. When the detection result of the memory pack presence / absence detection circuit 14 determines that the memory pack 13 is not present, the recording controller 15 causes the memory element to record an image for a predetermined time from the start of recording or the removal of the memory pack 13. 12 is controlled. Here, the predetermined time is a video time that can be held in the memory element 12, and is determined from the capacity of the memory element 12 and the bit rate and compression rate of the video signal from the camera signal processing and encoding processing circuit 11. It is also possible to preset a time that is less than the recordable time.

  When the result of detection by the memory pack presence / absence detection circuit 14 determines that the memory pack 13 is being installed and the camera video recording device (particularly the memory pack 13) is preparing for recording, the recording control unit 15 controls the memory element 12. And endless recording. Endless recording is a method of always recording new information by discarding old information when the recording capacity is limited and recording is performed at full capacity. Thereafter, when the recording preparation of the camera video recording apparatus is completed, the video signal is transferred from the memory element 12 to the memory pack 13. That is, in this case, an image that can be traced back by the recording time that can be held in the memory element 12 can be recorded from the time when the memory pack can be recorded.

  The recording control 15 also performs input control from an operation unit (not shown) that is operated by a user (a cameraman). The memory element 12 and the memory pack 13 are controlled in accordance with a recording preparation start signal, a recording start signal, a recording stop signal, a memory pack 13 take-out signal, and the like input from the operation unit. This control is executed together with determination of the state of the memory element 12, the memory pack 13, the memory pack presence / absence detection circuit 14, and the like. For example, in such a control example, the memory pack 13 performs a write prohibition control by ignoring the memory pack 13 extraction signal during writing.

  Further, the recording control 15 displays the contents recorded in the memory element 12 when the memory pack 13 is replaced on the liquid crystal panel 16 and prompts the operator (cameraman) to select whether to transfer to the memory pack 13. The video signal is transferred according to the selection result. The liquid crystal panel 16 is not dedicated to this selective display but may be a liquid crystal monitor that is also used as another.

[Control method]
2, 3, and 4 are flowcharts illustrating an example of the operation of the recording control unit 15. The flowcharts described in these three figures (FIGS. 2, 3, and 4) are connected to each other by connectors 1 to 6 (circle symbols in the figure) to form one flowchart. For the sake of explanation, the same components as those in the camera video recording apparatus shown in FIG. 1 will be described using the same reference numerals.

  First, it is detected whether the recording preparation switch is turned on. The recording preparation switch detects whether or not the recording preparation switch is turned on by an operation unit (not shown) that operates recording, and transmits an on signal to the recording control unit 15 when the recording preparation switch is on. If it is on, the process proceeds to step S201. If it is off, the process proceeds to step S205 (S200).

  In step S201, the recording control unit 15 controls endless recording for the memory element 12 (S201). Endless recording is a method of always recording new information by discarding old information when the recording capacity is limited and recording is performed at full capacity. After recording one frame or a predetermined frame, the process proceeds to step S202.

  In step S202, the recording control unit 15 detects whether the recording start switch is turned on. The detection method is the same as that of the recording preparation switch. The recording start switch permits switch input after confirming that the memory pack 13 has been inserted. If the recording start switch is off, the memory pack 13 has not been inserted, and the process proceeds to step S201, where the recording control unit 15 continues to control endless recording for the memory element 12. When the recording start switch is on, the process proceeds to step S203 (S200).

  In step S203, the recording control unit 15 prohibits removal of the memory pack 13 (S203). Proceed to the next Step S204.

  In step S204, the recording control unit 15 executes control for transferring the video signal from the memory element 12 to the memory pack 13 at a high speed and recording it in the memory pack 13 (S204). Thereafter, the process proceeds to step S206.

  In step S205, a recording start switch-on signal is received, and the recording control unit 15 controls recording start. If it is on, the process proceeds to step S207. If it is off, the process proceeds to the end of this flowchart (S205).

  In step S206, since the high-speed transfer in step 204 has been completed, the recording control unit 15 releases the removal prohibition (S206). Then, the process proceeds to the next step S207.

  In step S207, the video signal from the camera signal processing and encoding processing circuit 11 is recorded in the memory element 12 (S207). Then, the process proceeds to the next step S208.

  In step S208, the recording control unit 15 detects whether the recording stop switch is on (S208). The on / off information of the recording stop switch is the same as that of the recording preparation switch. If it is on, the process proceeds to step S216. If it is off, the process proceeds to step S209.

  In step S209, the recording control unit 15 detects whether or not a predetermined capacity has been recorded in the memory element 12. If not, the process proceeds to step S207. If recorded, the process proceeds to step S210 (S208).

  In step S210, the contents of the memory element 12 are recorded by high-speed transfer from the memory element 12 to the memory pack 13 (S210). Thereafter, the process proceeds to step S211.

  In step S211, the recording control unit 15 detects whether the take-out switch is on. The on / off operation of the take-off switch is the same as that of the recording preparation switch. If the take-off switch is off, the process proceeds to step S207, and if it is on, the process proceeds to step S212 (S211).

  In step S <b> 212, the recording control unit 15 performs control for recording for a predetermined time (for example, 30 seconds) in the memory element 12. Thereafter, the process proceeds to step S213 (S212).

  In step S 213, the presence / absence of the memory pack 13 is detected by the memory pack presence / absence detection 14. If there is no memory pack 13, the process proceeds to step S216, and if there is a memory pack, the process proceeds to step S214 (S213).

  In step S214, it is selected whether or not to discard the data recorded in the memory element 12. The recording control unit 15 displays on the liquid crystal panel 16 whether or not to discard, and allows the operator (for example, a cameraman) to select. If it is discarded, the process proceeds to step S216. If not discarded, the process proceeds to step S215 (S214).

  In step S215, the video signal is transferred from the memory element 12 to the memory pack 13 at a high speed (S215). Thereafter, the process proceeds to step S207.

  In step S216, the contents of the memory element 12 are cleared and the process waits until the next recording time, and this flowchart is ended (S216).

  As can be understood from the flowcharts described above, the recording control unit 15 detects the presence or absence of the memory pack 13 and, if the memory pack 13 is present, the video signal recorded in the memory element 12 for each predetermined recording capacity. Control to transfer to. Further, when there is no memory pack 13, control is performed to perform endless recording or recording for a predetermined time. At this time, whether to perform endless recording or recording for a predetermined time is determined depending on whether the camera video recording device (particularly, the memory pack 13) is in a recording preparation state.

  FIG. 5B shows an example of the operation at the start of recording by the camera video recording apparatus according to the embodiment of the present invention. As can be seen from comparison with FIG. 5A, the camera video recording apparatus of the present invention can record immediately after the power is turned on. That is, even if no memory pack is installed, endless recording can be performed on the memory element by turning on the recording preparation switch.

  After that, the memory pack is mounted, the preparation is completed, and the recording start switch is turned on. At the same time as the high-speed transfer from the memory element to the memory pack, the removal of the memory pack is prohibited. The memory device continues to record in time division even during transfer to the memory pack. When the high-speed transfer to the memory pack is completed, the removal prohibition is canceled.

  Thereafter, when recording is performed in the memory device for each predetermined capacity, the data is transferred to the memory pack at a high speed. The recording is stopped by the recording stop switch and the power is turned off.

  FIG. 6B shows a case where the memory pack is taken out and replaced during recording. Immediately after removal of the memory pack, recording to the memory element is started. After that, when the replacement memory pack is installed, it is selected whether to transfer or discard the recorded contents of the memory element. When the transfer of the recorded contents of the memory element is selected, the information recorded in the memory element is transferred at high speed to the memory pack. Since the memory element records only for a predetermined time, the recorded video may be interrupted after the predetermined time. Therefore, it is preferable to perform the exchange time within a predetermined time. Stop recording with the recording stop switch.

  FIG. 7 is a diagram illustrating an example in which the camera video recording apparatus of the present embodiment is applied to a television camera. For example, it is assumed that the recording is performed by exchanging the memory pack 13 (media) because the video is switched to the “copist rush” video while the “stand-up video” is recorded as the scoop video. In this case, numbers are assigned to the memory packs (media) of the media 101 of “Stand-up video” and the media 102 of “Police officer”, and the media 103 of the recording material can be easily produced by reading these numbers. be able to.

  In addition to the embodiments described above, many variations of the present invention are possible. For example, a combination of a plurality of memory elements 12 and a plurality of memory packs 13 can be configured to variably set the recording times of the plurality of memory elements 12. Accordingly, the invention is not limited to the embodiments described above, but only by the claims.

  The present invention is useful for a camera video recording apparatus that records news and the like with a television camera used in a broadcasting station. In addition, the recording medium is not a long start-up time such as a tape or a disk, and is useful when a memory pack using an IC memory is used.

It is a block diagram of the camera video recording apparatus of the present invention. It is a flowchart of recording control (the 1). It is a flowchart of recording control (the 2). It is a flowchart of recording control (the 3). It shows the state of the recording device at the start of recording. It shows the state of the recording device at the time of recording. It is an application example of the present invention.

Explanation of symbols

10 CCD (Charge Coupled Device)
DESCRIPTION OF SYMBOLS 11 Camera signal processing and encoding processing circuit 12 Memory element 13 Memory pack 14 Memory pack presence / absence detection circuit 15 Recording control unit 16 Liquid crystal panel 101 “Standing video” medium 102 “Police intrusion” medium 103 Recording material medium

Claims (3)

Encoding means for encoding an imaging signal from a solid-state imaging device after camera signal processing;
A first recording medium for recording the encoded imaging signal;
A detachable second recording medium for transferring and recording the recorded contents of the first recording medium;
Detecting means for detecting the presence or absence of the second recording medium;
Recording control means for controlling the first recording medium and the second recording medium,
When it is determined that the detection means is present during recording preparation, the recording control means performs control for causing the first recording medium to perform endless recording,
If the detecting means determines that no during recording, the recording control means have line control to the recording of a predetermined time to said first recording medium,
When it is determined that the detection means is present during recording, the recording control means causes the first recording medium to operate as a buffer memory of the second recording medium, and to the second recording medium every predetermined recording capacity. Control to transfer,
A camera video recording apparatus that controls to prohibit removal of the second recording medium when the content recorded on the first recording medium is transferred to the second recording medium . The camera video recording apparatus according to claim 1,
The recording control means records the content recorded on the first recording medium at a speed twice as fast as the recording speed of the first recording medium when transferring and recording the content recorded on the first recording medium to the second recording medium. A camera video recording apparatus characterized by controlling as described above. Endless recording to a first recording medium during recording preparation;
Canceling the recording preparation and transferring the recording content recorded on the first recording medium before starting recording to the second recording medium faster than the first recording medium records ;
Prohibiting removal of the second recording medium during the transfer;
Releasing the removal prohibition when the transfer is completed;
Detecting whether a predetermined capacity is recorded on the first recording medium;
When a predetermined capacity is recorded on the first recording medium, transferring the recording content to the second recording medium faster than the first recording medium records ;
Detecting on / off of a take-off switch for the second recording medium ;
Recording a predetermined time on the first recording medium when the take-off switch is turned on.

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