JP3896505B2 - Electronic camera - Google Patents

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Publication number
JP3896505B2
JP3896505B2 JP2001068664A JP2001068664A JP3896505B2 JP 3896505 B2 JP3896505 B2 JP 3896505B2 JP 2001068664 A JP2001068664 A JP 2001068664A JP 2001068664 A JP2001068664 A JP 2001068664A JP 3896505 B2 JP3896505 B2 JP 3896505B2
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Japan
Prior art keywords
camera
horizontal
line
image
means
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JP2001068664A
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JP2002271654A (en
Inventor
丈司 宮下
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富士フイルム株式会社
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Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electronic camera that converts an optical image into electronic image data and records the image, and more particularly to a shooting support technique that can hold the camera horizontally during shooting.
[0002]
[Prior art]
Japanese Patent Application Laid-Open No. 10-307323 discloses a single-lens reflex camera provided with a level. This camera has a display unit of a level in the finder, and corrects the leveling by correcting the tilt of the camera while viewing the display of the level. In addition, the electronic camera disclosed in Japanese Patent Laid-Open No. 9-247512 includes an azimuth measuring unit that moves integrally with the optical system, and is configured to output information on the azimuth, elevation, or rotation angle at the time of shooting. ing.
[0003]
[Problems to be solved by the invention]
However, in order to realize the camera proposed in Japanese Patent Application Laid-Open No. 10-307323, it is necessary to newly install a posture display device in the finder of the camera. Also, when adjusting the level using a tripod or the like, it is inconvenient to look into the viewfinder.
[0004]
Japanese Patent Laid-Open No. 9-247512 proposes an electronic camera that can display and record a shooting direction (elevation angle, etc.), but this only records information and corrects it using the information during shooting. It is not a thing.
[0005]
The present invention has been made in view of such circumstances, and the camera posture at the time of shooting can be known and leveling can be easily performed without adding a special display device due to the configuration of the camera. An object is to provide an electronic camera.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, an electronic camera according to the invention described in claim 1 includes an imaging unit that converts an optical image into an electrical signal, and an image display unit that can display an image captured through the imaging unit. A posture detecting means for detecting the posture of the camera by detecting a tilt angle in the horizontal direction of the camera and a tilt angle in the elevation angle direction of the photographing optical system; and a horizontal reference line indicating the horizontal direction of the camera itself on the image display means. simultaneously with the display, the straight line and the vertical information in the horizontal direction elevation of the tilt of the tilt of the imaging optical system of the actual shooting screen relative to the horizontal reference line in accordance with the detection result of the lateral direction of the posture detecting means comprising a display control means for displaying line drawings which the direction of the straight line depicting the state of inclination of the elevation and horizontal grid pattern crossed, the said grid-like pattern, and the actual horizontal direction of the camera itself Consistent with the horizontal direction of the shadow screen, and the photographing optical axis of the imaging optical system is parallel to the horizontal plane, the vertical direction line disappears, as a feature that it appears as a straight line that is superimposed on the horizontal reference line Yes.
[0007]
According to the present invention, the camera attitude at the time of shooting is detected by the attitude detection means built in or externally attached to the camera, and the tilt information that varies depending on the attitude (tilt) on the image display means and the horizontal reference line of the camera itself Are displayed at the same time. The photographer can easily correct the tilt of the camera with reference to these displays.
[0008]
According to the aspect described in claim 2, as the tilt information, a straight line whose tilt angle with respect to the horizontal reference line varies according to the detection result of the posture detecting means is displayed, and the horizontal direction of the camera itself and the actual shooting screen are displayed. When the horizontal direction matches, the variable straight line is superimposed on the horizontal reference line and displayed as a single straight line. In this case, a mode in which a straight line that varies depending on the posture and a horizontal reference line are displayed in different colors is preferable. The photographer can easily recognize the tilt of the camera by seeing the difference between these two straight lines. Further, by displaying the vertical reference line of the camera itself, it becomes easy to level the camera when shooting in the vertical position.
[0009]
According to the aspect described in claim 3, the posture detection unit includes a unit that detects an inclination angle (hereinafter referred to as a tilt angle) of the imaging optical system in an elevation angle direction, and the display control unit includes the posture detection unit. According to a tilt angle detected by the means, information indicating a tilt state is displayed on the image display means.
[0010]
An aspect in which the tilt axis is extended to the elevation angle direction, the tilt angle of the photographing optical axis is detected, and information indicating the state of elevation is displayed on the image display means is preferable. According to a fourth aspect of the present invention, as the information indicating the tilting state, a line drawing depicting the elevation of a lattice pattern in which a horizontal line and a vertical line intersect is displayed. . In this case, as shown in claim 5, when the photographing optical axis of the photographing optical system is parallel to the horizontal plane (that is, the tilt angle = 0 °), the vertical straight line of the lattice pattern disappears. The aspect displayed as a straight line superimposed on the horizontal reference line is also preferable.
[0011]
An electronic camera according to a sixth aspect of the present invention is an image pickup means for converting an optical image into an electrical signal, an image display means capable of displaying an image picked up via the image pickup means, and an elevation angle direction of the photographing optical system Tilt angle detection means for detecting a tilt angle (hereinafter referred to as tilt angle), and display control means for displaying information indicating the tilt state on the image display means in accordance with the tilt angle detected by the posture detection means. It is characterized by having.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Preferred embodiments of an electronic camera according to the present invention will be described below with reference to the accompanying drawings.
[0013]
FIG. 1 is an external view of a digital camera according to the present embodiment. A photographing lens 12, a finder window 14, and a strobe light emitting unit 16 are provided on the front surface of the camera 10, and a shutter button 18 and a power switch 20 are disposed on the upper surface of the camera. A card slot 26 for mounting a memory card 24 is provided on the side of the camera opposite to the grip portion 22.
[0014]
The power switch 20 is also used as a mode switch, and is an “OFF position” where the power is turned off, a “shooting ON position” where the power is turned on in the still image shooting mode, and a “reproduction ON position” where the power is turned on in the playback mode. 3 positions can be switched. Instead of the power switch (hereinafter also referred to as a power combined mode switch) 20 as in this example, a power switch for power ON / OFF only and mode switching means such as a mode dial for switching between a still image shooting mode and a playback mode are provided. It may be provided separately.
[0015]
FIG. 2 is an external view of the rear side of the camera 10. On the back of the camera 10, a viewfinder 28, a liquid crystal monitor 30, a zoom switch 32, a cross button 34, a menu button 35, an execution button 36, and a cancel button 37 are provided. The liquid crystal monitor 30 is an image display unit that can be used as an electronic viewfinder for checking the angle of view at the time of shooting, and can display a preview image of the shot image, a reproduced image read from the memory card 24, and the like. Further, menu selection using the cross button 34 and setting of various items in each menu are also performed using the display screen of the liquid crystal monitor 30.
[0016]
The zoom switch 32 is composed of a lever switch that can be operated in the up / down direction. By operating the switch in the upward direction, the zoom switch 32 is zoomed in the telephoto (TELE) direction, and operated in the downward direction in the wide angle (WIDE) direction. Move the zoom. The cross button 34 is a multi-function button configured to be able to instruct and input directions in the up, down, left, and right directions. The cross button 34 is used as an operation button for instructing selection of various setting items and change of setting contents on the menu screen, This is used as means for instructing zoom magnification adjustment and sending / returning of playback frames.
[0017]
The menu button 35 is used when transitioning from the normal screen of each mode to the menu screen. The execution button 36 is used for confirming the selection contents and instructing execution (confirmation) of processing. The cancel button 37 is used when canceling (cancelling) an item selected from the menu or returning to the previous operation state. The photographer operates the zoom switch 32 to determine the angle of view while confirming the real-time image (through image) displayed on the finder 28 or the liquid crystal monitor 30, and depresses the shutter button 18 to perform photographing.
[0018]
FIG. 3 is a block diagram showing the configuration of the camera 10. The light that has passed through the photographic lens 12 is imaged on the imaging device 40 after the amount of light is adjusted by the shutter / stop diaphragm mechanism 38. Various devices such as a CCD image sensor and a CMOS image sensor can be applied to the imaging device 40. The mechanical shutter prevents light from entering the imaging device 40 and generating smears when reading a signal from the imaging device 40, but is not necessarily required depending on the configuration of the imaging device 40. As the diaphragm mechanism, a single diaphragm or a switchable diaphragm can be applied.
[0019]
Photosensors are arranged in a plane on the light receiving surface of the imaging device 40, and the subject image formed on the light receiving surface is converted into signal charges of an amount corresponding to the amount of incident light by each photosensor. The drive circuit 42 includes an imaging device driver and operates the imaging device 40 based on a timing signal provided from the clock generator 44. The drive circuit 42 is a block including drive circuits for the photographing lens 12, the shutter combined diaphragm mechanism 38, and the strobe light emitting unit 16, and is controlled by the CPU 50.
[0020]
The signal charges accumulated in the respective photosensors of the imaging device 40 are sequentially read out as voltage signals (image signals) corresponding to the signal charges based on the pulses given from the drive circuit 42 and sent to the analog signal processing unit 52. . The analog signal processing unit 52 includes a signal processing circuit such as a sampling hold circuit, a color separation circuit, and a gain adjustment circuit. In this analog signal processing unit 52, correlated double sampling (CDS) processing and R, G, B color signals. And color level adjustment (pre-white balance processing) of each color signal is performed.
[0021]
The signal output from the analog signal processing unit 52 is converted into a digital signal by the A / D converter 53 and then temporarily stored in the memory 56 via the main bus 54. The image data stored in the memory 56 is sent to the digital signal processing unit 58. The digital signal processing unit 58 is an image signal processing unit including a luminance / color difference signal generation circuit, a gamma correction circuit, a sharpness correction circuit, a contrast correction circuit, a white balance correction circuit, and the like, and processes an image signal according to a command from the CPU 50. .
[0022]
The image data input to the digital signal processing unit 58 is converted into a luminance signal (Y signal) and a color difference signal (Cr, Cb signal) and subjected to predetermined processing such as gamma correction and then stored in the memory 56. Written back. When a captured image is displayed and output, image data is read from the memory 56 and converted into a video signal in accordance with a predetermined display method via the digital signal processing unit 58. The video signal thus obtained is output to the liquid crystal monitor (LCD) 30 via the monitor driver 60.
[0023]
The image data in the memory 56 is periodically rewritten by the image signal captured from the imaging device 40, and a video signal generated from the image data is supplied to the liquid crystal monitor 30. Displayed in real time.
[0024]
The operation unit 62 is a block including the shutter button 18, the power mode switch 20, the cross button 34, and other various operation switches. When the shutter button 18 is pressed, a shooting start instruction (release ON) signal is issued, and the CPU 50 detects the release ON signal and executes an imaging operation for recording. That is, the CPU 50 controls the drive circuit 42 in response to the reception of the release ON signal, starts taking in image data for recording, and sends a command to the compression / decompression circuit 64. Thereby, the compression / decompression circuit 64 compresses the image data on the memory 56 in accordance with JPEG or another predetermined format.
[0025]
The compressed image data is recorded on the memory card 24 via the card interface 66. In the camera 10 of this example, for example, smart media (Solid-State Floppy Disk Card) is applied as means for storing image data. The form of the recording medium is not limited to this, and it may be a PC card, a compact flash, a magnetic disk, an optical disk, a magneto-optical disk, a memory stick, etc., and read / write according to an electronic, magnetic, optical, or a combination thereof. Various possible media can be used. A signal processing means and an interface corresponding to the medium to be used are applied. A configuration in which a plurality of media can be mounted regardless of different types or the same type of recording media may be adopted. The means for storing the image is not limited to the removable medium, but may be a recording medium (internal memory) built in the camera 10. In the case of storing an image in the internal memory, a communication interface for transferring data to an external device such as a personal computer is provided.
[0026]
In the reproduction mode, image data is read from the memory card 24, and the read image data is decompressed by the compression / decompression circuit 64 and then reproduced and output to the liquid crystal monitor 30 via the memory 56.
[0027]
The CPU 50 is a control unit of the camera 10 and is connected to the timer 68, the clock generator 44, and other peripheral circuits, and via the control bus 70, a memory 56, a digital signal processing unit 58, a monitor driver 60, and a compression / decompression circuit. 64, the operation unit 62, the drive circuit 42, the posture detection device 74, and the like. The CPU 50 controls the operation of the corresponding circuit based on the input signal received from the operation unit 62, and controls the display on the liquid crystal monitor 30, the flash emission control, the autofocus (AF) control, the automatic exposure (AE) control, and the recording. Controls shooting operations such as processing control.
[0028]
The CPU 50 performs various calculations such as a focus evaluation calculation and an AE calculation from the image data captured in response to the “half-press” operation of the shutter button 18, and controls the driving circuit 42 based on the calculation result to control the photographing lens 12. Is moved to the in-focus position, while the shutter-use diaphragm mechanism 38 is controlled, and the charge accumulation time of the imaging device 40 is controlled.
[0029]
The attitude detection device 74 is a means for detecting the attitude of the camera 10, and for example, a level, a gravity sensor, a gyro sensor, or the like can be used. A detection signal obtained by the posture detection device 74 is sent to the CPU 50. The CPU 50 calculates the tilt angle of the camera 10 based on the detection signal received from the posture detection device 74, and from the calculation result, a straight line for horizontal shooting to be displayed on the liquid crystal monitor 30 (hereinafter referred to as a horizontal shooting auxiliary line). ) To obtain data for displaying the straight line.
[0030]
The horizontal photographing auxiliary line data generated according to the tilt angle data is sent to the liquid crystal monitor 30 via the monitor driver 60, and the horizontal photographing auxiliary line is displayed on the monitor screen.
[0031]
FIG. 4A shows a display example of the liquid crystal monitor 30 when photographing is performed with the camera 10 tilted. In the figure, the screen of the liquid crystal monitor 30 is shown upright, but is an example of the screen when the upper part of the camera 10 is tilted to the left as viewed from the photographer side.
[0032]
A straight line indicated by reference numeral 80 in FIG. 4A is a horizontal shooting auxiliary line displayed according to the inclination angle detected by the posture detection device 74, and is displayed, for example, as a yellow line. A straight line denoted by reference numeral 82 is a horizontal line of the camera itself (hereinafter referred to as a horizontal reference line), and is displayed as a fixed line at the center of the monitor screen. The horizontal reference line 82 is displayed as a blue line, for example. The display color of the line is not limited to the above example, and a mode in which each line is easily distinguished and color-coded is preferable. Moreover, you may comprise so that a user can select the display color of a line freely.
[0033]
When the tilt angle of the camera 10 is changed, the tilt angle of the horizontal photographing auxiliary line 80 with respect to the horizontal reference line 82 is changed according to the posture. When the camera 10 is held horizontally, the horizontal photographing auxiliary line 80 coincides with the horizontal reference line 82 and is displayed as a single straight line as shown in FIG. Thereby, the photographer can recognize the camera posture at the time of photographing, and can easily level the camera. In FIG. 4, the horizontal shooting auxiliary line 80 and the horizontal reference line 82 are displayed at the same time as the captured image (through image), but the horizontal shooting auxiliary line 80 and the horizontal reference line are displayed with the through image hidden. Line 82 can also be displayed.
[0034]
Although not shown, it is also preferable to display not only the horizontal reference line 82 but also the vertical line (vertical reference line) of the camera itself on the liquid crystal monitor 30. Displaying the vertical reference line facilitates leveling when shooting in the vertical position. Furthermore, a mode in which a vertical photographing auxiliary line whose inclination varies according to the camera posture detected by the posture detection device 74 is also possible. A mode of adding means for switching between display / non-display for at least one of a vertical reference line, a horizontal reference line, a vertical shooting auxiliary line, and a horizontal shooting auxiliary line, and display from these reference lines and auxiliary lines It is also possible to add a means capable of arbitrarily selecting.
[0035]
As a modification of the above-described embodiment, an aspect in which the axis for detecting the tilt of the camera 10 is expanded not only in the horizontal direction but also in the elevation direction is preferable. In other words, the tilt angle of the photographing optical axis (the optical axis of the photographing lens 12) is detected by the posture detection device 74, and the degree of elevation is intuitively grasped on the screen of the liquid crystal monitor 30 based on the detected tilt angle data. Make possible displays. The display examples are shown in FIGS.
[0036]
FIG. 5 is a display example when the photographing optical axis of the camera 10 is slightly downward, and FIG. 6 is a display example when the camera 10 is further downward from the state of FIG. As shown in these drawings, on the screen of the liquid crystal monitor 30, a line drawing depicting the elevation of the lattice pattern 84 in which the horizontal straight lines intersect with the vertical straight lines is displayed, and the tilt angle of the camera 10 is displayed. Accordingly, the display content of the lattice pattern 84 (a trapezoidal line drawing showing a state of looking down or a state of looking up) is changed. When the photographing optical axis is directed upward, the trapezoidal lattice pattern 84 is inverted upside down.
[0037]
FIG. 7 is an example of a screen when the upper part of the camera 10 is further tilted to the left when viewed from the photographer side from the state shown in FIG. As shown in FIG. 7, when the camera 10 is tilted with respect to the horizontal line, the tilt angle of the grid pattern 84 with respect to the horizontal reference line 82 is changed and displayed according to the tilt angle.
[0038]
When the photographing optical axis of the camera 10 is directed directly in front and the camera 10 is held horizontally, as shown in FIG. 8, the lattice pattern 84 coincides with the horizontal reference line 82 and is displayed as a single straight line. The When the camera 10 is tilted in the horizontal direction with the photographing optical axis facing directly in front (tilting angle = 0 °), the display contents are the same as those in FIG.
[0039]
As described with reference to FIGS. 5 to 8, camera posture information (tilt information) is displayed on the screen of the liquid crystal monitor 30 in a display form using a three-dimensional figure. The tilt angle of the optical axis and the tilt angle of the camera 10 can be intuitively grasped, and the camera posture at the time of shooting can be easily corrected.
[0040]
The method of displaying the tilt information of the camera when implementing the present invention is not limited to the examples of the horizontal photographing auxiliary line 80 and the lattice pattern 84 described above. For example, it is possible to display an image for indicating camera posture (tilt) information at an appropriate place such as the upper right of the screen of the liquid crystal monitor 30 and change the display of the image according to the camera posture. In addition, there is an aspect in which a numerical value of an inclination angle, a level block (indicator), or the like is displayed instead of or in combination with the image, but it is preferable that the photographer can recognize at a glance.
[0041]
In the embodiment described above, the digital camera for recording a still image has been described as an example. However, the scope of application of the present invention is not limited to this, and an optical image such as a digital camera or a video camera capable of recording still images and moving images can be used. It can be widely applied to an electronic camera that obtains an electronic video signal by converting it into an electrical signal.
[0042]
【The invention's effect】
As described above, according to the present invention, the camera posture is detected by the posture detection means provided in the camera, and the horizontal reference line of the camera itself on the screen of the image display means and the tilt information that varies depending on the camera posture. Are displayed at the same time, and the photographer can easily correct the tilt of the camera by referring to these displays.
[Brief description of the drawings]
FIG. 1 is a front external view of a digital camera according to the present embodiment. FIG. 2 is a rear external view of the digital camera according to the embodiment. FIG. 3 is a block diagram illustrating a configuration of the digital camera of the present embodiment. FIG. 5 is a diagram showing a display example of a liquid crystal monitor, where (a) shows an example of a screen when the camera is tilted to the left, and (b) shows an example of a screen when the camera is held horizontally. FIG. 6 is a diagram showing an example of displaying tilt information in the elevation direction of the axis. FIG. 6 is a diagram showing a state in which the photographing optical axis is further directed downward from the state of FIG. 5. FIG. FIG. 8 is a diagram showing an example of a screen when the optical axis of the photographing is facing directly in front and the camera is held horizontally.
DESCRIPTION OF SYMBOLS 10 ... Camera (electronic camera), 12 ... Shooting lens, 18 ... Shutter button, 24 ... Memory card, 30 ... Liquid crystal monitor (image display means), 40 ... Imaging device (imaging means), 50 ... CPU (display control means) , 74 ... posture detection device (posture detection means, tilt angle detection means), 80 ... horizontal photographing auxiliary line, 82 ... horizontal reference line, 84 ... lattice pattern

Claims (1)

  1. Imaging means for converting an optical image into an electrical signal;
    Image display means capable of displaying an image picked up via the image pickup means;
    Posture detecting means for detecting the posture of the camera by detecting the tilt angle of the horizontal direction of the camera and the tilt angle of the elevation direction of the photographing optical system ;
    A horizontal reference line indicating the horizontal direction of the camera itself is displayed on the image display means, and at the same time, the horizontal inclination of the actual shooting screen with respect to the horizontal reference line and the shooting optics according to the detection result of the posture detection means Display control means for displaying information indicating the degree of inclination in the elevation angle direction of the system in a line drawing depicting the state of elevation and horizontal inclination of a lattice pattern in which a horizontal line and a vertical line intersect each other ;
    In the lattice pattern, when the horizontal direction of the camera itself and the horizontal direction of the actual shooting screen match, and the shooting optical axis of the shooting optical system is parallel to the horizontal plane, the vertical straight line disappears, An electronic camera displayed as a straight line superimposed on the horizontal reference line .
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US8089553B2 (en) 2007-11-14 2012-01-03 Ricoh Company, Ltd. Lens drive device, image pickup device and lens drive method

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