JPH11168657A - Image-pickup device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid an out of focus image while a video camera makes panning. SOLUTION: This image-pickup device is provided with an image-pickup lens 2, a CCD 11 that converts the image of an object into a video signal and provides an output of it, and a processing circuit 14 that processes the video signal from the CCD 11 into a video signal with a prescribed format, and also with acceleration sensors 23, 24 that sense acceleration, and a circuit 23, that controls a shutter speed of the CCD 11 based on output signals from the acceleration sensors 23, 24. When the acceleration sensors 23, 24 detect acceleration, a microcomputer 22 changes the shutter speed from a standard speed into a high speed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an image pickup apparatus.

[0002]

2. Description of the Related Art As a photographing technique in a video camera,
There is panning. This is basically an imaging method in which the camera is swung in the horizontal direction (horizontal direction), but broadly includes an imaging method in which the camera is swung in the vertical direction (up and down direction).

[0003]

However, panning is equivalent to relatively moving the subject when viewed from the video camera. The shutter speed of the video camera is the reciprocal of the field frequency, that is, 1/60.
On the order of seconds. Therefore, when fast panning is performed by a video camera, an image is blurred.

[0004] For example, in a scene where a person waiting for a taxi leaves in a taxi coming in,
When photographing the waiting person fixedly and then photographing the taxi that runs away by panning,
A fixed photographed person is not blurred, but a subsequent panning image is blurred.

[0005] The present invention is to solve such a problem.

[0006]

Therefore, according to the present invention, there is provided an imaging lens, and a CCD for converting an image of a subject imaged by the imaging lens into a video signal and outputting the video signal.
A processing circuit for processing a video signal from the CCD into a video signal of a predetermined format; an acceleration sensor for detecting acceleration; and a circuit for controlling a shutter speed of the CCD based on an output signal of the acceleration sensor. And an imaging device configured to change the shutter speed from a standard to a high speed when the acceleration sensor detects that an acceleration is applied. Therefore, panning the video camera increases the shutter speed.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an example in which the present invention is applied to a video camera in which a VTR is integrated. Then, the image of the object 1 is
While being projected onto the CD 11, various timing signals are supplied to the CCD 11 from the timing signal forming circuit 21. In this case, some of the timing signals include
It also includes a signal S21 for determining an effective charge accumulation time (time for converting incident light into effective charge and accumulating it) in the CCD 11, and accordingly, the effective shutter speed of the CCD 11 is changed by the signal S21. It has been like that.

Then, a video signal of the subject 1 is taken out from the CCD 11, and this video signal is supplied to a sampling and holding circuit 12, where a valid signal component is sampled and held, and then supplied to an A / D converter circuit 13. The digital signal is supplied to a digital processing circuit 14 where it is converted into a luminance signal and a carrier chrominance signal. These signals are supplied to a noise reduction circuit 15 and integrated over several fields to reduce noise. .

The signal from which the noise has been reduced is D
The analog signal is supplied to the A / A converter 16 and D / A-converted into an analog luminance signal and a carrier chrominance signal. A frequency multiplexed signal with the signal is recorded on the magnetic tape of the tape cassette 3. At this time, a timing signal required in those circuits is supplied from the forming circuit 21 to the circuits 12 to 17, respectively.

Further, a sensor 23 for detecting a horizontal angular acceleration of the video camera and a sensor 24 for detecting a vertical angular acceleration are provided. Each detection output of the sensors 23 and 24 is
2 analog inputs (input terminals of a built-in A / D converter) A / D and A / D, and A / D-converted into, for example, 8-bit digital data D23 and D24, respectively. , The control signal S21 is changed, and the shutter speed of the CCD 11 is controlled.

However, in this case, as shown in FIG. 2, for example, the data D23 and D24 are offset binary data, and when the detection signals S23 and S24 cannot be obtained, that is, when acceleration is applied to the video camera. When not
The data D23 and D24 have a central value of 80h (h indicates a hexadecimal value), and change so as to move away from the central value when a forward or reverse acceleration is applied.

Further, as shown in FIG. 2, for example, as shown in FIG.
DTH (DTH> 0) and insensitive period τ are set. When both the data D23 and D24 are within the insensitive range 80h ± DTH, and when one or both of the data D23 and D24 is out of the insensitive range 80h ± DTH, the period during which the data D23 and D24 are out of the insensitive range If τ is less than τ, the data D23 and D24 are invalidated, and the signal S21 is set so that the shutter speed of the CCD 11 becomes a standard speed, for example, a field period.

However, when at least one of the data D23 and D24 continues to be out of the insensitive range 80h ± DTH for a period τ, the data D23 or D24 is validated and the shutter speed of the CCD 11 is increased. Is changed to the signal S21.

Further, in the microcomputer 22, a predetermined control signal S22 is formed on the basis of the data D23 and D24, and the control signal S22 is supplied to the noise reduction circuit 15 to integrate the signal performed for noise reduction. The number of fields is controlled. That is, when both the data D23 and D24 are within the insensitive range 80h ± DTH, and when one or both of the data D23 and D24 are in the insensitive range 80h ± DTH.
If the period that is outside TH is less than the period τ, the noise reduction circuit 15 is set to reduce the noise by integrating the signal over several field periods as usual. .

However, if at least one of the data D23 and D24 continues to deviate from the insensitive range 80h ± DTH for a period τ, the number of fields of the signal integration executed in the noise reduction circuit 15 is normally smaller. Less than.

In such a configuration, if the video camera is stationary or panning, but the panning speed is slow, the data D23 and D24
Does not deviate from the insensitive range 80h ± DTH, the signal S21 sets the shutter speed of the CCD 11 to a time close to, for example, the field period. Further, noise reduction processing in the noise reduction circuit 15 is also performed as usual.
Therefore, shooting and recording are performed with an image optimal for fixed shooting.

However, if the video camera is continuously panned at a certain speed or more, the state in which the data D23 or D24 deviates from the insensitive range 80h ± DTH becomes longer than the period τ. The shutter speed is changed to high speed. If the shutter speed is high, blurring of the image due to panning is prevented.

Since the noise reduction circuit 15 integrates the signal to reduce the noise, the image should appear to have a tail when panning. However, when panning, the image is integrated. Since the number of fields of the signal is reduced, the trailing of the image is reduced.

Thus, according to this video camera, when panning is performed, the shutter speed is increased, so that blurring of a captured image can be prevented. Further, when panning is performed, the number of fields to be integrated is reduced, so that the trailing of the image is also reduced.
Further, only when panning is performed, the shutter speed is set to a high speed. When panning is not performed, the shutter speed is set to a standard shutter speed.

In the above description, the shutter speed can be continuously changed according to the panning speed. Further, in the noise reduction circuit 15, the number of fields of the signal to be integrated can be continuously changed according to the panning speed.

[0021]

According to the present invention, blurring and tailing of a photographed image can be prevented or reduced even when panning is performed. Also, only when panning is performed,
When the shutter speed is high and panning is not performed, the standard shutter speed is used.
There is no underexposure.

[Brief description of the drawings]

FIG. 1 is a system diagram illustrating one embodiment of the present invention.

FIG. 2 is a diagram for explaining the present invention.

[Explanation of symbols]

1 = subject, 2 = imaging lens, 3 = tape cassette, 1
1 = CCD, 12 = Sampling and holding circuit, 13
= A / D converter, 14 = Digital processing circuit, 15 =
Noise reduction circuit, 16 = D / A converter, 17 = recording circuit, 21 = timing signal forming circuit, 22 = microcomputer, 23 and 24 = acceleration sensor

Claims (5)

[Claims] An imaging lens, a CCD for converting an image of a subject imaged by the imaging lens into a video signal and outputting the video signal, and a processing circuit for processing the video signal from the CCD into a video signal of a predetermined format. An acceleration sensor for detecting acceleration; and a circuit for controlling a shutter speed of the CCD based on an output signal of the acceleration sensor. When the acceleration sensor detects that acceleration is applied, the shutter speed is set to a standard value. An imaging device that changes at high speed. 2. The imaging device according to claim 1, further comprising a noise reduction circuit that integrates the video signal over a predetermined number of fields to reduce a noise component included in the video signal. An imaging apparatus configured to reduce the number of fields to be integrated when detecting the acceleration as compared with when the acceleration is not detected. 3. The imaging device according to claim 1, wherein the circuit for controlling the shutter speed is configured to output the signal when the acceleration detected by the acceleration sensor is larger than a predetermined value for a predetermined period. An imaging device configured to change a shutter speed. 4. The imaging device according to claim 2, wherein when the acceleration detected by the acceleration sensor is larger than a predetermined value for a predetermined period, the number of fields to be integrated is reduced. Imaging device. 5. The imaging device according to claim 1, wherein said acceleration sensor comprises: a first sensor for detecting acceleration in a horizontal direction; and an acceleration sensor for detecting acceleration in a vertical direction. An imaging device configured to be a second sensor for detection.