JP2867392B2 - Still camera - Google Patents

Description

The present invention relates to a still camera.

[Conventional technology]

In a still camera, an image signal obtained from an image sensor such as a CCD is converted into a small magnetic disk (hereinafter, referred to as a video floppy) in units of one field or one frame.
Can be recorded and stored. In other words, still
Unlike a silver halide film, a camera has a feature that it can be rewritten any number of times and that a captured image can be reproduced and confirmed on the spot.

[Problems to be solved by the invention]

Since the recording medium is rewritable, it is conceivable to use the camera again when the photographing has failed or when there is a concern about the quality of the photographing. Furthermore,
It is also conceivable that the photographed and recorded image is reproduced on the spot, the quality of the photographing is judged, and if not, the recorded image is erased and photographed again.

By the way, considering the main causes of the failure of shooting, it is out of focus and camera shake during shooting. Defocus can be sufficiently avoided by the appearance of an auto-focus device and its warning function. On the other hand, with respect to camera shake at the time of shooting, although some image processing algorithms for camera shake correction have been studied, none of them can be manufactured at low cost and can be processed in a short time.

Therefore, it is considered that hand-shake at the actual shooting site leads to the failure of shooting.
If the photographer can be warned of the occurrence of camera shake, it is not necessary to perform an operation of reproducing a recorded image and judging the quality of the image each time shooting is performed, which is convenient.

Therefore, an object of the present invention is to provide a still camera having a function of warning camera shake.

[Means for solving the problem]

A still camera according to the present invention is a still camera that records an image signal from an imaging unit on a recording medium by field recording or frame recording, and includes an illumination unit that illuminates a subject and a storage capacity for one field or one frame. Image memory means, a motion detecting means for detecting the presence or absence of motion between captured images, a blur warning means for performing a camera blur warning operation in accordance with a detection result of the motion detecting means, and the lighting means. When shooting is not performed, the camera shake warning operation is performed by the camera shake warning unit based on the output of the motion detection unit. When shooting using the illumination unit, the camera shake warning operation is prohibited by the camera shake warning unit. And control means for causing

The still camera according to the present invention also includes an illumination unit that illuminates the subject, an image recording unit that records an image of the subject, a motion detection unit that detects a motion, and a motion detected by the motion detection unit. Camera
A blur warning means for performing a blur warning, and a shooting warning notifying the blur warning means based on an output of the motion detecting means at the time of shooting without using the lighting means, and a blur warning at the time of shooting using the lighting means. And means for controlling the camera shake warning operation.

The still camera according to the present invention also includes an illuminating unit that illuminates the subject, an image recording unit that records an image of the photographic subject, a motion detecting unit that detects a motion, and a shooting mode that does not use the illuminating unit. Let the motion detection means perform a motion detection operation, and at the time of shooting using the illumination means,
Control means for prohibiting the motion detection operation by the motion detection means.

[Action]

If a certain amount of movement is detected by the above means, camera shake has occurred and the photographer is warned of this, so the photographer can take immediate measures. it can.

〔Example〕

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

FIG. 1 is a configuration block diagram of one embodiment of the present invention.
Reference numeral 10 denotes a solid-state imaging device such as a CCD, reference numeral 11 denotes a switch normally connected to the contact b, and reference numeral 12 denotes a signal from the switch 11 which is converted into a luminance signal Y and color difference signals RY and BY. A camera signal processing circuit for outputting, 14 is a recording signal processing circuit for performing predetermined emphasis, FM modulation, etc. on the output of the camera signal processing circuit 12 and converting it into a recording signal format, 16 is a recording amplifier,
18 is a recording head, 20 is a video floppy, 22 is a system controller, 24 is an A / D converter that samples and digitizes the output of the image sensor 10, and 26 has a storage capacity for one field or one frame. Image memory, 28
Is a subtraction circuit that calculates a difference between image data corresponding to the same sample point between the output of the A / D converter 24 and the output of the image memory 26, and 30 is a D that converts the output of the image memory 26 into an analog signal. /
The A converter 32 is a motion detection circuit that detects the presence or absence of a motion from the output of the subtraction circuit 28.

Regarding the algorithm of motion detection in the motion detection circuit 32, a great many methods have been announced, and description thereof will be omitted. A famous one is the one used in the MUSE system, which is a Hi-Vision compression system on the border of Japan Broadcasting Corporation.

Also, an easier way is to show the current screen
The binarized output of the A / D conversion tree 24 and the binarized output signal of the photographing screen before a predetermined field or frame output from the image memory 26 are sequentially compared for a plurality of regions on the photographing screen,
The number of changed areas at the same position on the screen is counted, and when the counted value is equal to or more than a predetermined value, it is determined that camera shake that cannot be ignored has occurred, and a shake detection output signal is output.

FIG. 2 shows a flowchart of the operation of the system controller 22. The operation will be described with reference to FIG. When the shutter button is pressed (S1), the switch 11 is set to a
Connected to the contact side (S2), the accumulated image signal is read from the image sensor 10, and the switch 11, the camera signal processing circuit 1
2, recording signal processing circuit 14, recording amplifier 16, and magnetic head 1
Recorded on video floppy 20 via 8. At the same time, the output of the image sensor 10 is digitized by the A / D converter 24 and written to the image memory 26 (S3).

In the case of flash shooting, this ends shooting (S
4) Otherwise, after or immediately after the elapse of a predetermined time, the shutter is opened and closed again to read an image signal from the image sensor 10. At this stage, the switch 11 is connected to the contact b, and recording on the video floppy 20 is not performed. The output of the image sensor 10 is digitized by the A / D converter 24. At the same time, the data stored in the image memory 26 is read out, and the subtraction circuit 28 calculates the difference between the image data corresponding to the same sample point. Then, the motion detection circuit 32
Obtains the difference values of all the image sample points from the subtraction circuit 28, and detects the presence or absence of a motion according to a predetermined motion detection algorithm (S5). Then, it is determined whether or not the amount of movement is below a certain threshold.

If it is determined that the movement is "present" (S6), the camera shake is warned to the photographer by a lamp or sound (S7). If the movement is less than the threshold value, that is, if there is no blur, the photographing is terminated.

In the case of flash shooting, ending the shooting is completely different from the image data when the flash is turned on and the image data to be taken out again in S5 when the flash is turned off, so there is no point in comparing them. It is.

FIG. 3 shows another flowchart of the operation of the system controller 22. When the shutter button is pressed (S10), immediately after the shutter is closed, the image sensor 10
The image signal is read out from, and written to the image memory 26 via the A / D converter 24 (S11).

In the case of flash photography (S12), the data stored in the image memory 26 is read out, and the D / A converter 30, switch 11, camera signal processing circuit 12, recording signal processing circuit 14, recording amplifier
The data is recorded on the video floppy 20 via the magnetic head 16 and the magnetic head 18 (S18). When not using flash photography (S1
2) Open or close the shutter after or immediately after the predetermined time,
The image signal is read from the image sensor 10, and the image signal is
It is digitized by the D converter 24. At the same time, the data stored in the image memory 26 is read out, and the subtraction circuit 28 calculates the difference between the image data corresponding to the same sample point. And
The motion detection circuit 32 determines whether or not there is a motion in the same manner as described above (S13).

When the motion detection circuit 32 determines that there is no motion (S1
In 4), the data stored in the image memory 26 is read out again and recorded on the video floppy 20 via the switch 11, the camera signal processing circuit 12, the recording signal processing circuit 14, the recording amplifier 16 and the magnetic head 18. (S18). When it is determined that there is movement (S14), the camera shake is warned to the photographer by sound or lamp (S15), and an instruction from the photographer is waited for a certain period of time (S16). If there is no instruction,
As described above, the data stored in the image memory 26 is recorded on the video floppy 20, and if there is an instruction, for example, a command to record even if blurring has occurred (S17), the process proceeds to S19, and recording is performed. Is received (S18), a predetermined operation such as resetting of the memory is performed, and the photographing is terminated.

〔The invention's effect〕

As described above, according to the present invention, when a camera shake is detected at the time of shooting, a shake warning can be issued, and in particular, when a lighting device such as a strobe is used, the movement due to the emission of the strobe is performed. Erroneous detection, erroneous display of camera shake, and the like can be prevented beforehand, and a still camera with reliable operation and high reliability can be provided.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention, and FIGS. 2 and 3 are first and second flowcharts showing the operation of the system controller shown in FIG. 10 solid-state imaging device, 11 switch, 12 camera signal processing circuit, 14 recording signal processing circuit, 16 recording amplifier, 18 magnetic head, 20 video floppy, 22
…… System controller, 24 …… A / D converter, 26…
... Image memory, 28 ... Subtraction circuit, 30 ... D / A converter, 32
…… Motion detection circuit

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H04N 5/225 H04N 5/232

Claims (3)

(57) [Claims] 1. A still camera for recording an image signal by an image pickup means on a recording medium by field recording or frame recording, comprising: an illuminating means for illuminating a subject; and an image memory having a storage capacity for one field or one frame. Means, motion detecting means for detecting the presence or absence of motion between the captured images, blurring warning means for performing a camera shake warning operation according to the detection result of the motion detecting means, and at the time of shooting without using the illumination means, The camera shake warning operation is performed by the shake warning unit based on the output of the motion detection unit, and at the time of shooting using the illumination unit,
A control means for prohibiting the camera shake warning operation in the shake warning means. 2. An illumination device for illuminating a subject, an image recording device for recording an image of the subject, a motion detection device for detecting a motion, and a camera when a motion is detected by the motion detection device. A blur warning means for giving a blur warning; and when shooting without using the illumination means, the blur warning means is caused to perform a blur warning based on an output of the motion detecting means. A still camera comprising: a warning unit; and a control unit that prohibits the camera shake warning operation. 3. An illuminating unit for illuminating a subject, an image recording unit for recording an image of the photographic subject, a motion detecting unit for detecting a motion, and And a control unit for performing a motion detection operation and prohibiting the motion detection operation by the motion detection unit when photographing using the illumination unit.