JPH04368925A - Camera - Google Patents

Abstract

PURPOSE:To allow the identification of whether photographing is good or not good on the spot. CONSTITUTION:A discrimination circuit 14 detects the presence or absence of a movement from the video signal of photographed videos by a camera circuit 10. The discrimination circuit 14 detects the presence or absence of the movement according to the shutter release signal (d) from an operating key 20, prohibits the recording of a recording circuit 12 in the event of the presence of the specified or larger movement and displays the NG(not good) with a display circuit 16.

Description

[Detailed description of the invention]

0001

[Industrial Field of Application] The present invention relates to cameras, and more specifically, silver halide films, magnetic tapes, magnetic disks,
The present invention also relates to a camera that records captured images, particularly still images, as a recording medium such as a semiconductor memory.

0002

2. Description of the Related Art When traveling, people often ask others to take commemorative photos using still cameras. Modern cameras have fully automated focus and exposure adjustments, so you can usually take a good photo just by pressing the shutter button.

0003

[Problem to be Solved by the Invention] When requesting someone to take a photo in this way, you explain that all you have to do is press the shutter button and hand over the camera. Since this is often not the camera used by the camera, even if you press the shutter button or a part that looks like a shutter button, you cannot be sure whether the shutter is closed or not. In particular, some of today's compact cameras have extremely low shutter noise, making it difficult to confirm shutter operation by ear or by mechanical vibration.

[0004] Furthermore, it is difficult to determine whether camera shake is occurring or not using someone else's camera.

[0005] An object of the present invention is to provide a camera that solves these problems.

[0006]

[Means for Solving the Problems] A camera according to the present invention includes:
The present invention is characterized by having means for outputting a predetermined message depending on the shooting situation in conjunction with the shutter operation.

[0007]

[Operation] With the above means, it is possible to know on the spot the shooting situation, such as the presence or absence of camera shake. In other words, it is possible to check whether or not good photographing has been performed.

[0008]

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

FIG. 1 shows a configuration block diagram of an embodiment of the present invention applied to a camera-integrated video recording device (so-called camcorder).

Setting/cancelling of the photographing situation display mode of this embodiment is inputted from the operation key 20 and set in the mode setting circuit 18. The camera circuit 10 outputs a video signal a of a predetermined frequency when the power is turned on, and the video signal a is applied to the recording circuit 12, the discrimination circuit 14, and the display circuit 16.

Although the details will be described later, the discrimination circuit 14 constantly detects the movement of the subject based on the video signal a from the camera circuit 10, and detects the movement of the subject from L (low) to H in response to the shutter release operation of the operation key 20. In response to the shutter signal d rising to high (high), the recording control signal c is output to the recording circuit 12 and the display switching signal b is output to the display circuit 16.

The recording control signal c is a control signal that instructs the recording circuit 12 to perform a recording operation when there is little camera shake;
The recording circuit 12 records the video signal a onto a recording medium in response to this. The recording control signal c prohibits the recording circuit 12 from recording when the camera shake exceeds a predetermined value.

The display circuit 16 also includes a mode setting circuit 1.
When the mode signal e from 8 is the shooting status display mode, an OK display for good shooting is displayed according to the display switching signal b (for example, "You took a good shot" or an equivalent display in English). , or an NG indication for inappropriate shooting (for example, "Please try again")
is displayed superimposed on the video signal a.

FIG. 2 shows a detailed circuit configuration block diagram of the discrimination circuit 14. The motion detection circuit 22 detects the presence or absence of movement of the subject from the video signal a from the camera circuit 10, and the comparison circuit 24 compares the amount of motion detected by the motion detection circuit 22 with a predetermined threshold TH. That is, when the movement is larger than the threshold TH, it is determined that there has been camera shake, and when it is smaller than the threshold TH, it is determined that good photographing has been performed. The gate circuit 26 enters the pass state when the shutter button of the operation key 20 is pressed, and the output of the comparison circuit 24 is outputted as a display switching signal b and a recording control signal c to the display circuit 16 and recording circuit 12, respectively. Ru.

A detailed circuit configuration block diagram of the display circuit 16 is shown in FIG. 28 is a circuit that generates a message when OK, 30 is a circuit that generates a message when NG,
According to the display switching signal b, the switch 32 switches between the circuits 28 and 30.
Switch the output. The switch 32 is connected to the output side of the circuit 28 when the imaging is good, and is connected to the output side of the circuit 30 when the imaging is poor. Further, the switch 34 is opened and closed by a mode signal e from the mode setting circuit 18, and is closed when displaying the shooting situation. Therefore, when in the shooting situation display mode (switch 34 is closed), the addition circuit 36 sends a message to the camera circuit 1 according to the shooting situation.
It is superimposed on the video signal a from 0. The output of the adder circuit 36 is applied to a liquid crystal display device 38 to display an image.

In this embodiment, predetermined messages are superimposed and displayed on the photographed video, but these messages may be output as audio by an audio generating circuit. This is sometimes useful, such as in still cameras that do not use electronic viewfinders.

FIG. 4 shows an operational flowchart of this embodiment. First, it is checked whether the mode setting circuit 18 is set to the shooting situation display mode (S1). The camera waits for a shutter release operation using the operation key 20 (S2), and when the shutter release is performed, the photographing situation, for example, the presence or absence of camera shake is determined (S3).

If the condition is good, the OK generation circuit 28
A message is displayed on the display device 38 (S4), and the recording circuit 12 is caused to start recording (S5).
is displayed (S6, 7). Upon completion of recording, "End" is displayed (S8), the process waits for a certain period of time (S9), the current display is erased, and the process returns to S1. If the shooting conditions are poor (S3
), the NG display by the NG generation circuit 30 is displayed on the display device 38 (S10). Until the number of NGs is less than N (for example, 3) times (S11), re-triggering is accepted (S12)
, by re-triggering, the current display is stopped (erased) and waits for another shutter release (S2). When the number of NGs exceeds N (for example, 3), an apology (or a recommendation to temporarily stop shooting) is displayed and the process ends (S14).

In this embodiment, a display device such as an EVF can be used both for displaying photographed images and for displaying information on photographing conditions. In particular, a video camera having an anti-shake device has the advantage that the motion detection circuit can also be used.

[0020]

As can be easily understood from the above description, according to the present invention, the shooting situation is displayed when someone else operates the shutter, so good shooting can always be expected. Therefore, you can easily make and receive requests.

[0021]Furthermore, since poor imaging due to camera shake or the like can be confirmed on the spot, there is no need to notice it until it is too late after returning home.

[Brief explanation of drawings]

FIG. 1 is a configuration block diagram of an embodiment of the present invention.

FIG. 2 is a circuit configuration block diagram of the discrimination circuit 14.

FIG. 3 is a circuit configuration block diagram of the display circuit 16.

FIG. 4 is an operation flowchart of this embodiment.

[Explanation of symbols]

10: Camera circuit 12: Recording circuit 14: Discrimination circuit 16: Display circuit 18: Mode setting circuit 2
0: Operation key a: Video signal of captured image b: Display switching signal c: Recording control signal d: Shutter signal e: Mode signal 22: Motion detection circuit 24
: Comparison circuit 26: Gate circuit 28: OK generation circuit 30: NG generation circuit 32: Switch 34
: Switch 36: Adder circuit 38: Liquid crystal display device

Claims (1)

[Claims] 1. A camera characterized by having means for outputting a predetermined message depending on the shooting situation in conjunction with shutter operation.