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JP2011119792

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DESCRIPTION JP2011119792
An image pickup apparatus which controls a directional range of a voice to a range
corresponding to an angle of view, so that a surrounding situation can be confirmed by voice at
the start of recording. A system control device (40) controls the zoom of a photographing lens
(10) to an angle of view corresponding to the lever position of a zoom lever (38B), and the
directivity range of a zoom microphone (20) corresponds to a zoom magnification. Control to the
The system control device (40) controls the directivity range of the zoom microphone (20) to a
range wider than the directivity range corresponding to the zoom magnification of the
photographing lens (10) for a certain period at the start of recording, and the lapse of the period
After that, control is performed toward the directivity range corresponding to the zoom
magnification of the photographing lens (10). [Selected figure] Figure 1
Imaging device
[0001]
The present invention relates to an imaging device for capturing voice simultaneously with
imaging.
[0002]
[0003]
Patent Document 1: Japanese Patent Application Publication No. 2001-333489 Patent Document
3: Japanese Patent No. 03658361
10-05-2019
1
[0004]
An imaging apparatus for capturing a moving image such as a video camera generally has a
means for recording surrounding sound.
Many video cameras are equipped with an image zoom function that shoots a subject at a wide
angle or close-up.
The image zoom includes an optical zoom that controls the angle of view of the photographing
lens, and an electronic zoom that electronically scales the captured image.
[0005]
If the audio capture range is the same even though the angle of view is different, for example,
when close-up shooting is performed on the target subject, ambient noise other than the sound
emitted by the target subject may be captured.
As a technique for solving such a problem, Patent Document 1 describes a technique for
controlling the directivity of a microphone as voice input means in conjunction with an image
zoom magnification.
[0006]
Also, in order to cope with various shooting conditions, the video camera is provided with a
plurality of shooting modes in which various data for exposure control are preset. For example,
the shooting mode includes, for example, a sport shooting mode, a landscape shooting mode, and
a portrait mode. Specifically, control characteristic information of exposure control parameters
such as aperture value, shutter speed and gain according to each shooting mode is stored in
advance in a reference table, and exposure according to the shooting mode selected by the user
Control imaging with control parameters.
10-05-2019
2
[0007]
Patent Document 2 describes switching the pointing range of the microphone according to the
selected imaging mode. That is, in the portrait mode, the directivity range of the microphone is
narrowed to reduce noise noise around the subject. In landscape mode or sport mode, the
pointing range is expanded to enable recording of surrounding sounds.
[0008]
In the technique described in Patent Document 1, for example, when the subject is zoomed at the
start of shooting, the directivity of the microphone is set narrow, and only the sound around the
subject is captured. That is, the recorded video and audio have almost the same content whether
or not there is a sound source in the vicinity. Therefore, the viewer can not recognize the
surrounding situation when viewing either of the reproduction results.
[0009]
An object of the present invention is to present an imaging device in which surrounding
conditions can be easily recognized by voice while controlling the voice capture range in
accordance with the angle of view in principle.
[0010]
An imaging apparatus according to the present invention includes an imaging unit capable of
imaging a subject and changing an angle of view, a voice input unit capable of collecting sound
and changing a directivity range, an angle of view of the imaging unit, and the voice input unit. It
is an imaging device provided with the control means which controls the said pointing range,
Comprising: The said control means makes the said pointing range of the said audio | voice input
means the pointing range according to the said angle of view according to operation of recording
start. It is characterized in that control is performed to a wide pointing range, and then control is
performed to a pointing range according to the angle of view.
[0011]
An imaging apparatus according to the present invention controls an imaging means for imaging
a subject, a voice input means for collecting voice and changing a pointing range, a
photographing mode of the imaging means, and the pointing range of the voice input means. An
imaging device including control means, the control means changing the pointing range of the
10-05-2019
3
voice input means to a pointing range wider than the pointing range according to the shooting
mode according to the switching operation of the shooting mode It is characterized in that
control is performed, and then control is performed to a pointing range according to the
photographing mode.
[0012]
An image pickup apparatus according to the present invention comprises an image pickup means
for photographing an optical image of an object at a designated zoom factor and acquiring image
data, and an audio input means for collecting surrounding sound in a predetermined directivity
range and acquiring audio data. And control means for controlling the pointing range of the
audio input means, and instruction means for instructing start of recording of the image data and
the audio data, the control means responding to the instruction of start of recording Controlling
the directivity range of the voice input unit to a directivity range wider than the directivity range
corresponding to the zoom factor of the imaging unit, and thereafter setting the directivity range
of the voice input unit to the directivity range corresponding to the zoom factor of the imaging
unit To control.
[0013]
An image pickup apparatus according to the present invention comprises an image pickup means
for photographing an optical image of a subject in a designated photographing mode and
acquiring image data, and an audio input means for collecting surrounding audio in a
predetermined directivity range and acquiring audio data. And control means for controlling the
pointing range of the audio input means, and instruction means for instructing start of recording
of the image data and the audio data, the control means responding to the instruction of start of
recording. The directivity range of the voice input means is controlled to a directivity range wider
than the directivity range corresponding to the imaging mode of the imaging means, and then
the directivity range of the voice input means is changed to the directivity range corresponding
to the imaging mode of the imaging means It is characterized by controlling.
[0014]
According to the present invention, when viewing a shot that has been taken, it is possible to
estimate the situation around the subject by voice.
As a result, the effect of the zoom microphone can also be confirmed, and a stable viewing feeling
can be maintained.
10-05-2019
4
[0015]
It is a schematic structure block diagram of one example of an imaging device concerning the
present invention.
It is a schematic block diagram of a zoom microphone.
6 is an operation flowchart of microphone directivity range control according to zoom lens
operation.
It is an example of change of the microphone directivity range by control shown in FIG.
10 is a part of an operation flowchart of microphone directivity range control according to a
shooting mode. It is the remainder of the operation flow chart of microphone directivity range
control according to photography mode. It is an example of a change of the microphone
directivity range by control shown in FIG.5 and FIG.6.
[0016]
Hereinafter, embodiments of the present invention will be described in detail with reference to
the drawings.
[0017]
FIG. 1 is a schematic block diagram of a video camera which is an embodiment of an imaging
apparatus according to the present invention.
[0018]
A photographing lens 10 forms an optical image of a subject on a CCD image sensor 12.
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5
The taking lens 10 is adjustable in zoom, focus and aperture.
The imaging element 12 converts an optical image by the imaging lens 10 into an electrical
image signal, and supplies the electrical image signal to the camera signal processing unit 14.
The camera signal processing unit 14 performs color interpolation processing, γ correction,
white balance adjustment, matrix processing, and the like on the image signal from the imaging
element 12 and outputs the result as a camera image signal. The exposure control reference
table 16 is a so-called look-up table, in which exposure control data corresponding to each of a
plurality of shooting modes is stored. The shooting modes include, for example, a sport shooting
mode, a landscape shooting mode, and a portrait mode. The camera signal processing unit 14
also reads out exposure control data corresponding to a shooting mode specified by a control
signal from the system control device 40 from the exposure control reference table 16 and
applies the data to the exposure control.
[0019]
The image compression unit 18 compresses and encodes the camera image signal from the
camera signal processing unit 14 by a compression method such as MPEG 2 and supplies the
compressed image data to the recording and reproduction unit 22. The camera image signal is
also supplied to the display unit 28 and the selector 30.
[0020]
The zoom microphone 20 is an audio input means for acquiring external audio data, and can
change the directivity range of the audio to be collected. The audio signal collected by the zoom
microphone 20 is supplied to the recording / reproducing unit 22 and the selector 34.
[0021]
During recording, the recording / reproducing unit 22 records the compressed image data from
the image compression unit 18 and the audio signal from the zoom microphone 20 on the
recording medium 24. The recording medium 24 is composed of a hard disk, an optical disk, a
magneto-optical disk, a magnetic tape, a non-volatile memory card or the like.
10-05-2019
6
[0022]
During reproduction, the recording / reproducing unit 22 reads the compressed image data and
the audio signal from the recording medium 24, supplies the compressed image data to the
image expanding unit 26, and supplies the audio signal to the selector 34. The image
decompression unit 26 decompresses the compressed image data into the original baseband
image data. The image data restored by the decompression is supplied to the display unit 28 and
the selector 30.
[0023]
The display unit 28 displays a camera image in a so-called camera mode for recording a captured
image, and displays a reproduction image in a so-called video mode for reproducing an image
recorded on the recording medium 24. The selector 30 selects a camera image signal in the
camera mode, selects a reproduced image signal in the video mode, and outputs the selected
image signal to the image signal output unit 32. Similarly, the selector 34 selects an audio signal
at the time of shooting in the camera mode, selects a reproduced audio signal in the video mode,
and outputs the selected audio signal to the audio signal output unit 36.
[0024]
The photographer can input various instruction settings to the imaging device through the
operation unit 38. The operation unit 38 includes a trigger switch 38A for instructing recording
start and end, and a zoom lever 38B for performing a zoom operation. In addition, there are a
camera / video switching switch 38C for switching between the camera mode and the video
mode, a shooting mode selection switch 38D for selecting a shooting mode, and the like.
[0025]
The system control device 40 generally controls the above-described blocks. The system control
device 40 internally has a plurality of timers for measuring various times.
10-05-2019
7
[0026]
FIG. 2 shows a configuration example of the zoom microphone 20. As shown in FIG. Although a
configuration using an MS (Mid-Side) microphone is described as a microphone whose directivity
can be controlled, the present invention is not limited to this microphone. The MID microphone
(front microphone) 50 has directivity in the front direction (Mid side) as shown by the sensitivity
curve 50a, and the SIDE microphone (side microphone) 52 has left and right sides (Side as shown
by the sensitivity curve 52a). Side). The gain varying unit 54 changes the gain of the output
signal of the MID microphone 50 to the gain specified by the pointing range control signal from
the system control device 40. The phase division unit 56 divides the output of the SIDE
microphone 52 by the phase division unit 56, and supplies the negative phase output to the
adder 58 and the positive phase output to the adder 60. The adder 58 adds the negative phase
output of the phase dividing unit 56 to the output of the gain varying unit 54. The addition result
of the adder 58 is the right output. The adder 60 adds the positive phase output of the phase
division unit 56 to the output of the gain variable unit 54. The addition result of the adder 60 is
the left output. A stereo signal can be obtained by this operation.
[0027]
The directivity range is determined by the sensitivity Sm to the sound from the front and the
ratio Ss / Sm of the sensitivity Ss to the sound from the side. Therefore, the directivity range can
be controlled by changing the gain of the voice from the front by the gain varying unit 54. The
system control device 40 applies a pointing range control signal according to the zoom factor of
the photographing lens 10 and the recording mode to the gain variable unit 54 to control the
gain for the sound from the front. By this control, the function of the zoom microphone is
obtained.
[0028]
The control operation of the microphone directivity range according to the predetermined
operation, which is a feature of the present embodiment, will be described. FIG. 3 shows a
flowchart of the control operation of the system control apparatus 40.
[0029]
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8
When the process is started by power on or the like, the system control device 40 reads the
current zoom position information from the operation of the zoom lever 38B of the operation
unit 38 or the operation state of the zoom lens accompanying this operation (S1). Further, the
system control device 40 reads operation information of the camera / video changeover switch
38C, the trigger switch 38A, the photographing mode selection switch 38D and the like (S2).
[0030]
The system control apparatus 40 determines switching from the video mode to the camera mode
based on the read operation information (S3).
[0031]
When the camera mode is switched (Y in S3), the system control apparatus 40 determines
whether the recording has been started (S4).
When it is determined that the recording is to be started (Y in S4), the system control device 40
clears the recording time measurement timer TR (S5). By the processes of S4 and S5, the
recording time measurement timer TR is cleared to zero at the start of recording. Thereafter, the
recording time measurement timer TR counts up with the passage of time and measures the
elapsed time.
[0032]
Next, it is determined whether the recording time measurement timer TR has exceeded the timer
threshold value TR_TH (S6). If the timer TR exceeds the threshold value TR_TH (Y in S6), the
system control device 40 substitutes a control value M_ZOOM indicating a pointing range
corresponding to the zoom position at that time into the pointing range control value MD (S7).
[0033]
If the timer TR does not exceed the threshold value TR_TH (N in S6), the system control
apparatus 40 substitutes the control value M_WIDE indicating the pointing range corresponding
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9
to the wide end of the photographing lens 10 into the pointing range control value MD (S8). In
the present embodiment, although the control value M_WIDE indicating the directivity range
corresponding to the wide end of the photographing lens 10 is substituted into the directivity
range control value MD, the range is wider than the range corresponding to the zoom angle of
view at the beginning of recording It should be set. By doing so, a wider range of sound can be
captured as compared with the angle of view.
[0034]
If the directivity of the zoom microphone 20 is controlled using the directivity range control
value MD set in step S7 or S8 as it is, the directivity of the zoom microphone 20 may change
rapidly, resulting in unnatural sound recording. I will. In order to avoid this, in the present
embodiment, the pointing range control value MD is smoothed with respect to the passage of
time, and is substituted for the pointing range control value MD_S to be actually applied to the
zoom microphone 20 (S9). However, in this embodiment, this smoothing process is performed
only in the direction in which the directional range becomes narrow, and the smoothing process
is not performed in the direction in which the directional range becomes wide. The system
control device 40 controls the directivity range of the zoom microphone 20 with the smoothed
directivity range control value MD_S (S10).
[0035]
S6 and subsequent steps are repeated until there is an instruction to end recording (S11). When
the recording end instruction is issued (S11), the system control device 40 ends the pointing
range control of the zoom microphone 20.
[0036]
In this embodiment, since the zoom microphone 20 is controlled by the smoothed pointing range
control value MD_S, it is possible to alleviate the rapid change of the pointing range.
[0037]
FIG. 4 shows one sequence example of directivity range control of the zoom microphone 20
according to the present embodiment.
10-05-2019
10
FIG. 4 (a) shows the change of the pointing range of the zoom microphone 20, and FIG. 4 (b)
shows the change of the zoom position by the operation of the zoom lever 38B. In FIG. 4A, the
horizontal axis indicates time, and the vertical axis indicates the microphone directivity range. In
FIG. 4B, the horizontal axis indicates time, and the vertical axis indicates the zoom position of the
zoom lever 38B. The zoom position corresponds to the zoom value.
[0038]
In the example shown in FIG. 4, before the start of recording, the zoom value and the directivity
range of the microphone correspond one to one. When the zoom is moved from the wide end to
the tele end between time PW and time PT, the directivity range of the zoom microphone 20 also
changes from the widest state M_WIDE to the minimum state according to the change of the
zoom position.
[0039]
It is assumed that recording is started at time PS. By the process of FIG. 3, the directivity range of
the zoom microphone 20 becomes the largest area regardless of the previous zoom state. As
described above, even if it is not the maximum size, it may be wider than the current zoom state
but wider than the pointing range when shooting a nucleus. After that, the recording is
continued, and it is assumed that the recording time TR exceeds the threshold value TR_TH at the
time indicated by the time Pa. Then, in the process of step S9, the directivity range of the zoom
microphone 20 gradually changes toward the directivity range according to the zoom position,
and returns to the directivity range corresponding to the zoom position at time Pb.
[0040]
As described above, in the present embodiment, the directivity range of the microphone can be
controlled to a wider range than the wide range in accordance with the zoom value for a
predetermined time after the start of recording. Therefore, when viewing the video and audio
(cut 70) recorded in this way, although the reproduced image is in a narrow range of the tele
end, the surrounding situation can be inferred from the reproduced sound at the reproduction
start portion. After the recording time TR exceeds the threshold value TR_TH, the directivity
10-05-2019
11
range of the microphone is smoothly changed little by little toward the range according to the
zoom state, so that the sound collection effect of the zoom microphone can be made more
impressive.
[0041]
Even when viewing a plurality of cuts recorded only on the tele side, the first part of each cut
records an audio with a wide sense of sound collected in a wide directivity range. This makes it
possible to obtain a stable viewing feeling as compared to the conventional case.
[0042]
5 and 6 generally show a control flow of the present embodiment in the case where the
directivity range of the zoom microphone 20 is controlled to the directivity range according to
the photographing mode.
[0043]
When the process is started by turning on the power or the like, the system control apparatus 40
reads operation information such as the camera / video changeover switch 38C, the trigger
switch 38A, and the photographing mode selection switch 38D (S21).
[0044]
The system control apparatus 40 determines switching from the video mode to the camera mode
based on the read operation information (S22).
When the camera mode is switched (S2), the system control device 40 clears the camera mode
measurement timer TC (S23).
The camera mode measurement timer TC is cleared to zero when the video mode is switched to
the camera mode by the processes of S22 and S23. Thereafter, the camera mode measurement
timer TC counts up with the passage of time and measures the elapsed time.
10-05-2019
12
[0045]
The system control device 40 determines whether the recording has been started (S24). When it
is determined that the recording is to be started (S24), the system control device 40 clears the
recording time measurement timer TR (S25). By the processes of S24 and S25, the recording
time measurement timer TR is cleared to zero at the start of recording. Thereafter, the recording
time measurement timer TR counts up with the passage of time and measures the elapsed time.
[0046]
The system control device 40 determines the presence or absence of a change in the shooting
mode such as the sport mode or the portrait mode (S26). If it is determined that the shooting
mode has been switched (S26), the system control apparatus 40 clears the shooting mode
measurement timer TM (S27). By the processes of S26 and S27, the photographing mode time
measurement timer TM is cleared to zero when the photographing mode is changed. Thereafter,
the photographing mode measurement timer TM counts up with the passage of time and
measures the elapsed time.
[0047]
The elapsed time after switching to the camera mode, the elapsed time from the start of
recording, and the elapsed time from the change of the shooting mode are determined (S28, S29,
S30). Specifically, it is checked whether each timer TC, TR, TM has exceeded the corresponding
threshold TC_TH, TR_TH, TM_TH. When all the timers TC, TR, and TM exceed the threshold
values TC_TH, TR_TH, and TM_TH, the system control apparatus 40 substitutes a control value
indicating a pointing range corresponding to the shooting mode at that time into the pointing
range control value MD ( S31). For example, when the shooting mode is the sport mode, the
pointing range control value M_S corresponding to the sport mode is substituted for the pointing
range control value MD. When the imaging mode is the portrait mode, the pointing range control
value M_P corresponding to the portrait mode is substituted for the pointing range control value
MD. Here, when there are more imaging modes, directivity range control values corresponding to
the respective imaging modes are substituted.
[0048]
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13
When one of the timers TC, TR, and TM does not exceed the threshold (S28, S29, S30), the
system control apparatus 40 controls the control value M_WIDE indicating the directivity range
corresponding to the wide end of the photographing lens 10 as the directivity range control
value Assign to MD (S32). In principle, the ambient sound capture range at the beginning of
recording may be set to a range wider than the range corresponding to the zoom angle of view.
This is because a wider range of sound can be captured compared to the angle of view.
[0049]
If the directivity of the zoom microphone 20 is controlled using the directivity range control
value MD set in step S31 or S32 as it is, the directivity of the zoom microphone 20 may change
rapidly, resulting in unnatural sound recording. I will. In order to avoid this, in the present
embodiment, the directivity range control value MD is smoothed over time, and the smoothed
directivity range control value MD_S is calculated (S33). However, in this embodiment, this
smoothing process is performed only in the direction in which the directional range becomes
narrow, and the smoothing process is not performed in the direction in which the directional
range becomes wide. The system control device 40 controls the pointing range of the zoom
microphone 20 with the smoothed pointing range control value MD_S (S34).
[0050]
S28 and subsequent steps are repeated until there is an instruction to end recording (S35). When
the recording end instruction is issued (S35), the system control device 40 ends the pointing
range control of the zoom microphone 20.
[0051]
FIG. 7 shows one sequence example of the pointing range control shown in FIG. 5 and FIG. The
horizontal axis shows time, and the vertical axis shows the microphone directivity range. When
recording is started at time PS, the directivity range control value becomes the control value
corresponding to the maximum width M_WIDE in S29 and S32. Thereafter, the recording is
continued, and when the recording time TR exceeds the threshold value TR_TH at time Pa1, the
control value is changed to a control value M_S indicating a pointing range corresponding to the
sport mode in step S31. However, due to the smoothing process (S33), the time Pb1 is reached,
10-05-2019
14
and the pointing range corresponds to the control value M_S.
[0052]
Thereafter, when the imaging mode is switched to the portrait mode at time Pm, the control
value corresponding to the maximum M_WIDE of the directivity range control value is obtained
at S30 and S32. Thereafter, at time Pa2, the duration TM of the imaging mode exceeds the
threshold TM_TH. Then, in step S31, the control value is changed to a control value M_P
indicating a pointing range according to the portrait mode. However, due to the smoothing
process (S33), at time Pb2, the pointing range corresponding to the control value M_P is
obtained.
[0053]
As described above, in the present embodiment, the directivity range of the zoom microphone 20
is once changed to the wide first control range, and is converged to the directivity range
according to the photographing mode. For example, in the cut 72 shown in FIG. 7, the first half is
photographed in the sport mode, and the second half is photographed in the portrait mode. In
the first half of each shooting mode, the directional range of the microphone is wide and
surrounding audio information is also recorded, so it is possible to estimate the surrounding
situation. In the period from time Pa1 to time Pb1 and in the period from time Pa2 to time Pb2,
the directivity range changes smoothly from the wide range to the range according to the
shooting mode. You can make a stronger impression.
[0054]
In each of the above embodiments, once the directivity range of the microphone is set to the wide
first directivity range, it is changed to the second directivity range according to the state of the
zoom lens and the photographing mode. However, it is not always necessary to set one of the
zoom lens state and the shooting mode to one of them, and by combining them, the directivity
range can be adjusted to the zoom lens state or the shooting mode in a timely manner. good.
[0055]
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15
Further, the threshold value of each timer used in each of the above embodiments may be set to
an optimum length according to the system, and there is no need to fix the length. In addition,
although the case of recording audio information in the left and right two-channel stereo has
been described to facilitate understanding, the present invention can also be applied to, for
example, a system that performs 5.1-channel surround recording.
[0056]
In addition, as a configuration for controlling the directivity range of the microphone, a zoom
microphone having a configuration other than the Mid-Side system can also be used. For
example, an L-R independent system in which the directivity angle and sensitivity are
mechanically converted, or one in which the directivity angle and sensitivity are switched by
other systems can be used in the present invention.
[0057]
Although a camera adopting an optical zoom has been described as an example, the present
invention can also be applied to an imaging apparatus using an electronic zoom.
[0058]
10: Shooting lens 20: Zoom microphone 40: System control device
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