JPH03280672A - Image pickup device - Google Patents

Abstract

PURPOSE:To confirm a tilted image pickup device under pickup operation stably together with a pattern in pickup operation and to prevent erroneous display due to a hand blur by controlling a detection means based on an output signal of the detection means detecting a tilt angle of the image pickup device. CONSTITUTION:The image pickup device is provided with a picture display means 2 displaying a picked-up picture, a detection means 3 detecting a tilt angle with respect to a reference attitude of an image pickup device 1, a control means 8 controlling the detection means 3 by a detected output signal and a display processing means 4 displaying the detected tilt angle onto the display screen of the display means 2. Then the attitude detection means 3 detects a tilt angle of the image pickup device 1 and the angle is displayed visually on a picture display means 4. Thus, the operator recognizes accurately immediately whether or not the displayed picked-up picture on the display means 4 is tilted and mis-display of the tilt angle due to a hand blur is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an imaging apparatus having a display means added to an imaging means and displaying a captured image on a monitor.

[Background technology]

In recent years, the development of video equipment such as video tape recorders (hereinafter abbreviated as VTR) has been remarkable, and especially in the field of home video cameras, so-called integrated videos that are integrated with video tape recorders are rapidly becoming popular. . Such integrated video cameras are generally small and lightweight, but on the other hand, it is somewhat difficult to provide stable support during filming. Particularly in the case where the photographer grasps and holds the grip attached to the bottom or side of the main body with one hand, it is difficult to maintain a constant angle, for example, horizontally. Therefore, an imaging apparatus has been proposed that allows the photographer to know the shooting angle during shooting on a monitor screen so that the shot image is not tilted.

[Problem that the invention seeks to solve]

However, when trying to accurately monitor the shooting angle, 1. If the device is made smaller (if the weight is made smaller), it will be affected by the camera shake of the photographer, making it impossible to obtain an accurate tilt display.

In addition, 2. If the camera shake of the photographer is taken into consideration, the means for detecting the tilt angle becomes large and heavy.

There was a problem.

[Means for solving problems]

The present invention has been made with the aim of solving these problems, and is characterized by: an image display means for displaying a captured image; a detection means for detecting the inclination angle of the imaging device with respect to a reference posture; , comprising a control means for controlling the attitude detection means using an output signal detected by the attitude detection means, and a display processing means for displaying the tilt angle detected by the attitude detection means on a display of the display means. It is characterized by

[Effect]

In the present invention, when the tilt angle of the imaging device is detected by the posture detection means, the detected tilt angle is visually displayed on the image display means, so that the operator can check whether the captured image displayed on the display means is tilted. It is possible to immediately and accurately know whether or not the tilt angle is displayed, and to prevent malfunctions in displaying the tilt angle due to camera shake, etc., and to realize a small and lightweight device.

[Explanation of Examples]

Hereinafter, details of embodiments of the present invention will be described.

FIG. 1 is a block diagram showing an example of the configuration of an embodiment of the present invention. In the figure, 1 is a video camera that captures images, and 2 is an electronic viewfinder (EVF) that uses a CR1 display device using a cathode tube or a liquid crystal display device.

The EVF 2 displays the photographed image on the display screen in synchronization with the horizontal synchronization signal H and the vertical synchronization signal ■ of the video camera 1.

3 is a horizontal detector that detects the inclination of the video camera body 1; Note that the horizontal detector 3 is installed inside the video camera body or the like. A converter 4 generates a display signal (SLV) for displaying the tilt on the EVF 2 based on the tilt detected by the horizontal detector 3.

5 is a control circuit for applying a dump to the horizontal detector 3 via the actuator 6 based on the detection signal (S L) of the horizontal detector 3; 6 is an actuator for controlling the horizontal detector 3 based on the output of the control circuit 5.

FIG. 2(A) is a diagram showing an example of the basic configuration of the horizontal detector 3 shown in FIG. 1.

In the figure, 13 is a weight using a hard ball or the like. Worker 2 is a rotating arm that supports the weight. Reference numeral 11 denotes a rotating shaft that rotatably supports the rotating arm 12. Machining 0 is the rotating shaft 11-
It is a permanent magnet that rotates freely with the magnet. A rotation angle detector 14 is fixed to the rotary workpiece 1 and rotates together with the fixed magnet 10. 15 is an electromagnet for controlling the magnet 10. F is a drive circuit for driving the electromagnet 15.

5 is intended to apply a damper to the movement of the permanent magnet 10 and the weight 13 by giving a predetermined loop gain and delay using the output SL of the rotation angle detector 14 and applying AC feedback to the electromagnet 15. It is a control circuit.

The control circuit 5 is an electrical feedback system, and the linearity of the system does not matter.

Next, a more specific example of the above-mentioned FIG. 2 (A) is shown in FIG. 2 (B).

In the figure, a hard ball 13, a rotating arm 12, a rotating shaft 11, a permanent magnet 10, an electromagnet 15, and a drive circuit 17 are the same as those in the previous embodiment.

Furthermore, in the figure, reference numeral 46 denotes a Hall element that outputs a predetermined voltage depending on the rotational position of the magnet 10, and a predetermined bias voltage is applied by known means (not shown). 44 is an amplifier that amplifies the output of the Hall element 46.

Here, the operation of the figure will be explained. When the camera 1 is tilted, the weight 13 is tilted, and the permanent magnet machine 0 is rotated via the rotating arm 12 and the rotating shaft 11.

When the permanent magnet 10 rotates, the Hall element 16 generates a voltage corresponding to the changed magnetic force, and the amplifier 44 causes the permanent magnet 10 to generate a voltage corresponding to the changed magnetic force.
A predetermined voltage signal SL is generated depending on the rotation angle. After the tilt signal SL has only a predetermined frequency component amplified and delayed by the control circuit 5, it is input to the drive circuit 17 for driving the electromagnet 15, and by driving the electromagnet in a direction that prevents the rotation of the permanent magnet 10. This applies a damper.

This causes the weight to vibrate unnecessarily due to hand shake, etc.
There are no inconveniences such as not being able to accurately display the tilt (and the device can always be tilted stably).

Therefore, stable detection can be performed without using a large weight itself.

The above explanation is about the operation of FIG. 2(B), but the operation is the same as that of FIG. 2(A).

FIG. 3 is a diagram showing an example of the configuration of the converter 4 shown in FIG. 1. In the figure, 51 is a horizontal clock generator that generates a horizontal clock having a period several times to several tens of times as long as one period of the horizontal synchronizing signal H.

52 is a horizontal position counter that counts this horizontal clock. The count value (HA) of the horizontal position counter 52 is
2 shows the horizontal position on the display screen.

53 is a vertical position counter that measures the horizontal synchronization signal H. The count value (VA) of the vertical position counter 53 is EVF2
indicates the vertical position on the display screen. Note that the horizontal clock generator 51 and the horizontal position counter 52 receive the horizontal synchronization signal H.
The vertical position counter 53 is reset by the vertical synchronizing signal V.

56 is an AD converter that converts the analog quantity of the angle signal SL into a digital quantity.

A read-only memory (ROM) 54 stores in advance a plurality of pieces of pattern information to be displayed on the EVF 2 according to the tilt angle of the video camera 1. As for one piece of display pattern information, information to be displayed is stored at each address of the ROM 54 so as to correspond to each position on the display screen of the EVF 2. Therefore, when the address of the ROM 54 is supported by the count value HA of the horizontal position counter 52, the count value VA of the vertical position counter 53, and the angle signal SL, pattern information according to the inclination is sent from the ROM 54 to the EVF 2 as a display signal SLV.

Note that a random access memory (RAM) may be used instead of the ROM 54, and pattern information corresponding to the tilt angle may be transferred from a microcomputer (not shown) to the RAM-1.

Furthermore, the standard pattern is made up of numbers indicating the inclination angle, and EV
It may be displayed at a predetermined position on the display screen of F2. FIG. 4 shows a display example of the EVF 2 shown in FIG. 1.

In FIG. 4, 24 is a display screen. 20 and 2
Reference numeral 1 denotes a display mark provided at the center of the edge of the display screen, which serves as a horizontal marker for recognizing the inclination angle of the displayed pattern information. 22 and 23 are display patterns sent from the converter 4;
Indicates the horizontal line connecting the .

For example, when the video camera 1 is tilted to the lower left with respect to the horizontal, the display pattern 22 is displayed from position A to position B, and the pattern 22 is moved and displayed from position A' to position B'. In addition, when detecting the inclination of the video camera 1 reliably, θ=nθ, where θ is the angle at which line segment AA' and line segment BB' intersect. (However, θ. is the inclination angle, and n is a real number of about 2 to 10.)
．． If the display position of the video camera 23 is determined in advance, the displayed tilt angle will be exaggerated, making it possible to detect subtle tilts of the video camera 1.

The inclination angle may be displayed by displaying the reference line 30 and the horizontal line 31 in a straight line or on a staircase, as shown in FIG. 4(B). Furthermore, it is also possible to display dotted lines instead of vertical lines, or to not display the reference line 30 and horizontal line 31, and the display form may be determined as desired.

〔Effect of the invention〕

According to the present invention, the inclination of the imaging device during shooting can be stably confirmed together with the screen during shooting, erroneous display due to camera shake can be prevented without using a large weight, and the device can be made smaller. The effect is that it is possible to obtain good captured images that maintain horizontality without increasing the size or weight of the camera.

[Brief explanation of drawings]

FIG. 1 is an overall block diagram showing the first embodiment of the present invention, and FIGS. 2(A) and 2(B) show the configuration of the horizontal detector 3 and the horizontal detector controllers 5 and 6 shown in FIG. A schematic diagram showing an example; FIG. 3 is a block diagram showing an example of the configuration of the converter 4 shown in the first drawing; FIGS. 4 (A) and (B) are explanatory diagrams showing display examples of the EvF2 shown in the first drawing. . 1...Video camera 2...EVF 3...Horizontal detector 4...Converter 5...Control circuit 6...Actuator 10 D/ri diagram

Claims (1)

[Claims] An imaging device, an image display means for displaying a captured image taken by the imaging device, a detection means for detecting a tilt angle of the imaging device with respect to a reference posture, and a display process for displaying the tilt angle detected by the detection means. What is claimed is: 1. An imaging device comprising: means for controlling said detecting means based on an output signal of said detecting means for detecting said inclination angle.