JP2000227543A - Optical equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an optical equipment capable of easily finding and displaying the size of a body to be photographed within a visual field of a finder based on a line-of-sight information of an observer looking the visual field of a finder and a photographing information of a photographic system. SOLUTION: In this optical equipment having a line of sight detection means that detects the line-of-sight information of the observer looking a finder system and a focal point detection means 6 for carrying out focal detection of a multiple number of focal detection ranges in the photographing range photographed by a photographic lens 1, a photographic magnification calculating means for calculating the photographing magnification based on the focal distance information of the photographic lens 1 and body to be photographed distance information obtained from the detected result of the focal point detection means 6, a body to be photographed size calculating means calculating the actual size of the body to be photographed within the photographic range based on data from the line-of-sight information detection means and the photographic magnification calculating means are provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical apparatus such as a video camera, a still camera, a digital camera and the like, and more particularly to a sight line detecting means which detects sight line information of a photographer (observer) who looks into a finder field of view. A gaze direction and / or a gaze point in the visual field are obtained, and a size of a subject in the viewfinder visual field is obtained using a signal obtained by the visual line detection means and photographing information of a photographing system, and is displayed in the viewfinder visual field. The present invention relates to an optical device described above.

[0002]

2. Description of the Related Art Conventionally, as a method of knowing the size (actual size) of a subject itself in photographing, a subject and a scale have to be photographed together, or an object that serves as a dimension reference instead of the scale ( For example, a method of taking a picture of a subject together with a subject (eg, a cigarette box) and comparing them with each other to conceptually determine the size, or the size of the subject on the film, the focal length of the taking lens, and the The photographing magnification is obtained from the amount of extension, and the size of the subject is calculated by a technique or the like.

In recent years, a proposal has been made to determine the size of a subject by using a so-called line-of-sight detection device that detects a position on an observation surface that is observed by an observer. For example, in Japanese Patent Application Laid-Open No. 07-151950, a photographed scene image is captured as image information, one or more photographing subject candidates are selected from the image information, and actual photographing is performed using the gaze position information of the photographer. One or more necessary photographing objects are determined from the photographing object candidates, and the focal length of the photographing lens is determined so that the determined photographing objects have an appropriate size on the photographing screen. We propose a camera that can get the composition you want to photograph.

[0004]

However, when an object to be a scale or a dimension is compared with an object to be photographed, the object to be a scale or a dimension must always be held, and the composition of the photograph must be kept. Will also be limited. Further, the method of calculating the size of the subject from the size of the subject on the film and the photographing magnification is cumbersome and cannot be recorded as a record on the film.

In Japanese Patent Application Laid-Open No. 07-151950, a plurality of subject candidates are divided into blocks (the size of the subject is determined) from a defocus map, and a block serving as a main subject is selected from the plurality of blocks. It uses eye gaze detection and does not measure the actual dimensions of the main subject itself.

The present invention solves such a conventional problem, and uses the photographing information (magnification etc.) of the photographing system and the line of sight information from the line of sight detecting means to determine the size (actual size) of the subject itself.
It is an object of the present invention to provide an optical device which can easily obtain the information and can simultaneously record the information on a film.

[0007]

According to the first aspect of the present invention, there is provided an optical apparatus comprising: a line-of-sight detecting means for detecting line-of-sight information of an observer looking into a finder system; In an optical apparatus having focus detecting means for performing focus detection of an area, a photographing magnification calculating means for calculating a photographing magnification based on focal length information of the photographing lens and subject distance information obtained by a detection result of the focus detecting means. And a subject size calculating means for calculating the actual size of the subject in the shooting range based on the data from the line of sight detecting means and the shooting magnification calculating means.

According to a second aspect of the present invention, in the first aspect of the present invention, the subject size calculating means calculates an actual size of the subject using a plurality of pieces of line-of-sight position information from the line-of-sight detecting means. .

A third aspect of the present invention is characterized in that, in the first aspect of the present invention, a calculation result by the subject size calculating means is superimposed and displayed by a display means in the finder system.

A fourth aspect of the invention is characterized in that, in the third aspect of the invention, the display means in the finder system uses a liquid crystal display on which character or non-character information is formed.

According to a fifth aspect of the present invention, in the first aspect of the present invention, there is provided a data recording means capable of recording on a recording medium a result of the calculation by the subject size calculation manual projection as predetermined information together with a photographed image. And

According to a sixth aspect of the present invention, there is provided an optical apparatus, wherein: a line-of-sight detecting means for detecting line-of-sight information of an observer looking into a viewfinder; and a focus detection for detecting a focus state in a plurality of regions in a viewfinder of a photographing system. Means, and subject calculation means for calculating the size of the subject from shooting information of the shooting system and gaze information in a finder field detected by the gaze detection means.

An optical apparatus according to a seventh aspect of the present invention is a line of sight detecting means for detecting line of sight information of an observer who looks into a finder visual field for forming a subject image by a photographic lens, and a photographic magnification calculating means for calculating a photographic magnification of the photographic lens. And a subject size calculating means for calculating the actual size of the subject based on the data from the line of sight detecting means and the photographing magnification calculating means.

According to an eighth aspect of the present invention, in the invention of the seventh aspect, the subject size calculating means calculates the size of the subject based on a plurality of pieces of line-of-sight position information from the line-of-sight detecting means.

A ninth aspect of the present invention is characterized in that, in the eighth aspect of the present invention, the result of calculation by the subject size calculating means is superimposed and displayed by a display means in a finder system.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention are shown in FIGS.
This will be described with reference to FIG.

FIG. 1 is a schematic diagram when the optical apparatus of the present invention is applied to a single-lens reflex camera. In the drawing, reference numeral 1 denotes a photographing lens, which is shown as two lenses 1a and 1b for convenience in the present embodiment, but it is well known that the lens is actually composed of a larger number of lenses. Reference numeral 2 denotes a main mirror, which is obliquely provided in the photographing optical path when in the observation state, and is withdrawn in the photographing state. A sub-mirror 3 reflects a light beam transmitted through the main mirror 2 toward the lower side of the camera body. Reference numeral 4 denotes a shutter, and 5 denotes a photosensitive member for recording a photographed image. The photosensitive member is a silver halide film, a solid-state imaging device such as a CCD or a MOS type, or an imaging tube such as a vidicon.

Reference numeral 6 denotes a focus detection device, which includes a field lens 6a, reflection mirrors 6b and 6 disposed near the image plane.
c, a secondary imaging lens 6e, an aperture 6d, a line sensor 6f composed of a plurality of CCDs, etc., using a well-known phase difference method so that a plurality of areas in the finder field can be detected. It is configured.

Reference numeral 7 denotes a focus plate arranged on a predetermined image forming plane of the photographing lens 1, and 8 denotes a superimposing LCD, which is disposed adjacent to the focus plate 7 and is formed on the focus plate 7. A field effect type twisted nematic mode (Twisted Nematic mode) in which a large number of segments are formed to superimpose and display a ranging point mark and a measurement index to be described later on the image (hereinafter referred to as a superimposed display).
Mode) using a TN liquid crystal display.

Reference numeral 9 denotes a visual field mask for forming a finder visual field (observation screen) area, and 10 denotes a penta roof prism for changing a finder optical path. Behind the exit surface of the penta roof prism 10, a light splitter 11 composed of, for example, a dichroic mirror that transmits visible light and reflects infrared light, and an eyepiece 12 are arranged, and the luminous flux of the subject image formed on the focus plate 7 Reaches the eyeball 13 of the photographer, and a finder image is observed.

Reference numerals 14 and 15 denote an imaging lens and a photometric sensor for measuring the brightness of the subject in the observation screen. The imaging lens 14 is a focusing lens 7 and a photometric sensor 15 via a reflection optical path in the pen prism 10. Are positioned in a conjugate imaging relationship. Reference numeral 16 (16a to 16f) denotes a photographer for detecting the gaze direction (gaze information) of the observer (photographer) from the relationship between the pupil and the image reflected by the corneal reflection of the light source conventionally used in single-lens reflex cameras and the like. A light source for illuminating the eyeball 13 of the eyepiece 12 made of an infrared light emitting diode
It is arranged around.

An eyeball image (virtual image due to corneal reflection) illuminated with infrared light from a light source 16 passes through an eyepiece 12 and is reflected by a light splitter 11, and a light receiving lens 17 forms a two-dimensional array of photoelectric elements such as a CCD. Image sensor 18
Imaged on top. The light receiving lens 17 positions the pupil of the photographer's eyeball 13 and the image sensor 18 in a conjugate imaging relationship. The gaze direction is detected by a predetermined algorithm from the positional relationship between the eyeball image formed on the image sensor 18 and the virtual image due to corneal reflection of the light sources 16a to 16f.

Reference numeral 19 denotes an LCD in the finder for displaying photographing information outside the finder field of view, and an LED for illumination.
The light illuminated by the (F-LED) 20 and transmitted through the LCD 19 is guided into the finder by the triangular prism 21 and displayed outside the finder field of view, so that the photographer can know the shooting information. Reference numeral 22 denotes an aperture provided in the photographing lens 1, and 23 denotes an aperture driving device including an aperture control circuit 110.

Reference numeral 24 denotes a lens driving motor, 25 denotes a lens driving member including a driving gear and the like, and 26 denotes a photocoupler which detects rotation of a pulse plate 27 interlocked with the lens driving member 25 and transmits it to a lens focus adjustment circuit 109. I have. The focus adjustment circuit 109 drives the lens drive motor 24 by a predetermined amount based on this information and the information on the lens drive amount from the camera body side, and moves the photographing lens 1a to the in-focus position.

Reference numeral 28 denotes a mount contact serving as an interface between a known camera and a lens; 29, a camera back cover;
Reference numeral 0 denotes a printing LCD 30a for storing shooting information on the photosensitive member 5, a printing display LCD 30b for displaying the content of the printing to the outside, and driving these LCDs 30a and 30b. LCD
1 is a known imprint module having a circuit and a lamp for imprinting.

FIG. 2 is a view showing the appearance of a single-lens reflex camera.
FIG. 2A is a top external view, and FIG. 2B is a rear view.

Reference numeral 40 denotes a release button having a switch (hereinafter referred to as SW1) function for starting photometry, distance measurement, and line-of-sight detection operations of the camera and a switch (hereinafter referred to as SW2) function for starting a release operation. The LCD 42 for the monitor as an external monitor display device is a mode dial, a lock position where the camera is not working, an automatic shooting mode position where the camera is controlled by a shooting program set in advance, and a manual where a photographer can set shooting contents. Gaze correction data is collected in order to correct a gaze detection error caused by a photographing mode (a program AE, a shutter priority AE, an aperture priority AE, a depth of field priority AE, a manual exposure, etc.), an individual difference of an eyeball (hereinafter referred to as calibration and AE). "CA" mode.
There is an “L” position and the index 4 marked on the camera body
By adjusting the display to 3, the switch (SW-M) of the display content is input and the mode of the camera is set.

Reference numeral 44 denotes an electronic dial for selecting a set value which can be further selected from among the modes selected by the mode dial by rotating and generating a click pulse. For example, when a shooting mode with shutter priority is selected with the mode dial 42, the L in the viewfinder is set.
On the CD 19 and the monitor LCD 41, the currently set shutter speed is displayed. When the photographer rotates the electronic dial 45, the shutter speed is sequentially changed from the currently set shutter speed according to the rotation direction.

Reference numeral 45 denotes an autofocus (hereinafter, referred to as AF) in which the camera automatically performs focus detection or a manual focus (hereinafter, referred to as MF) in which the digger performs focus detection using the manual ring 46 of the photographing lens 1. AF / MF selection switch.

In the AF, an automatic selection AF in which a camera automatically selects a plurality of focus detection areas in the viewfinder field of view according to a shooting situation, and an electronic dial 44 arbitrarily selects an area in which a photographer wants to perform focus detection. Optional A to choose
F, there is a line-of-sight input AF (detailed later) that detects the line-of-sight direction from the positional relationship between the pupil image of the photographer and the virtual image of the light source, and automatically selects a focus detection area corresponding to the line-of-sight direction.

Numeral 47 denotes a distance measuring point selection button.
By rotating the electronic dial 44, a distance measuring point mark corresponding to a plurality of focus detection areas can be selected, and the arbitrary selection AF or the automatic selection AF can be selected. The selected distance measuring point mark is superimposed by the superimposing LCD 8.

Reference numeral 48 denotes an AE lock button for holding a photometric value,
Reference numeral 9 denotes a line-of-sight input dial. The dial enters the line-of-sight input mode by setting the dial to the index 50.

Reference numeral 51 denotes a subject measurement button for entering a subject measurement mode described later. 30b is an LCD for imprinting display, and 30c is for turning on imprinting by pressing the button.
A mode button for switching the content of imprinting such as OFF, date, time, measurement result of the subject, etc., 30d is a selection button for selecting and setting a correction portion of imprint data, 30d
“e” is a set button for correcting the selected data.

3 (A), 3 (B), 3 (C) and 3 (D) show an LCD (display means) 8 for superimposing, an LCD 19 in the viewfinder, an LCD 41 for monitoring, and an imprint module 111 for imprint display. It shows the contents of all display segments of the LCD 30b.

In FIG. 3A, reference numerals 200 to 210 denote distance measuring point mark segments corresponding to the selected focus detection area and superimposed and displayed, and reference numeral 250 denotes a measurement index for displaying measurement points in the subject measurement mode. Segment. Although there are a plurality of measurement index segments 250, they are collectively referred to as 250 here for explanation. 26
Numeral 0 is a dimension display segment consisting of 7 segments of 3 digits for displaying a measurement point input instruction and a measurement result in the subject measurement mode and a fixed segment for displaying a measurement unit.

In FIG. 3B, a line-of-sight input mark segment 60 indicates a line-of-sight input state, and 61 is an AE.
Lock mark segment, 62 is a flash full mark segment, 63 is a shutter time display segment, 64
Is an aperture value display segment, 75 is an exposure correction setting mark segment, and 66 is a focusing mark segment indicating the focusing state of the photographic lens 1.

In FIG. 3C, 70 is a shooting mode display segment, 71 is a shutter time display segment, 7
2 is an aperture value display segment, 73 is an exposure correction display segment, 74 is a remaining film number display segment for displaying the number of remaining films, and 75 is a line of sight indicating that the AF operation of the camera is controlled using the line of sight information. This is an input mode display segment.

In FIG. 3D, reference numeral 80 denotes a date display segment for displaying year, month, day or time, and reference numeral 81 denotes a segment for displaying a measurement result in the subject measurement mode.

Since the imprinting LCD 30a has the same contents as the imprinting display LCD 30b, the description is omitted.

FIG. 4 is an explanatory diagram of the viewfinder field of view of the camera of FIG. Reference numeral 10 denotes the above-described field mask, and 7a denotes a distance measuring field frame formed on a focusing plate.
10 is superimposed and displayed. 230-2
Reference numeral 40 denotes a line-of-sight position recognition area, which is divided corresponding to the focus detection area and each of the distance measurement point marks. The display content 220 of the LCD 19 in the finder is displayed outside the finder field of view.

FIG. 5 is an electric circuit diagram incorporated in the camera of the present invention. The same components as those in FIGS. 1 and 2 are denoted by the same reference numerals. A gaze detection circuit 101, a photometry circuit 102, an automatic focus detection circuit 10 are provided in a central processing unit (hereinafter referred to as a CPU) 100 of a microcomputer built in the camera body.
3, signal input circuit 104, LCD drive circuit 105, IR
The ED drive circuit 106, the shutter control circuit 107, and the motor control circuit 108 are connected.

Signals are transmitted to the focus adjustment circuit 109 and the aperture control circuit 110 disposed in the taking lens via the mount contact 28 shown in FIG. CPU10
The EEPROM 100a attached to 0 has a function of storing the eye-gaze correction data collected by the above-described calibration. Multiple calibration data can be set,
Differentiating between people who use the camera, when the same user has different observation conditions, for example, when using glasses or not, or when using a diopter correction lens and not It is effective to set by distinguishing with. The line-of-sight detection circuit 101 includes the image sensor 1
8 (CCD-EYE) performs A / D conversion on the output of the eyeball image, and transmits this image information to the CPU 100. CPU10
0 extracts feature points of the eyeball image necessary for gaze detection according to a predetermined algorithm, and calculates the gaze of the photographer from the positions of the feature points as described later.

The photometric circuit 102 amplifies the output from the photometric sensor 15, performs logarithmic compression and A / D conversion, and sends the result to the CPU 100 as luminance information of each sensor. The photometric sensor 15 is composed of fifteen photodiodes SPC-A to SPC-O corresponding to each area of the finder field of view (not shown) divided into fifteen.

The line sensor 6f is a known CCD line sensor composed of 11 sets of line sensors CCD-A to CCD-K corresponding to the 11 distance measuring point marks 200 to 210 on the screen as described above. The automatic focus detection circuit 103 converts the voltage obtained from these line sensors 6f into A
/ D converted and sent to the CPU 100.

The signal input circuit 104 has the above-mentioned SW-1,
SW-2, SW-M provided in the mode dial 42 for selecting a mode of the camera, SW-AEL which is turned on by pressing an AE lock button 48, and SW which is turned on by pressing a distance measuring point selection button. -K, a switch provided in the line-of-sight input dial 49 for selecting the line-of-sight input mode
-S, switches SW-DIAL1 and SW-DIAL2 for generating a click pulse of the electronic dial 44 are connected, and the signal of each switch is input to the signal input circuit 104, and the CPU 1
Sent to 00.

Note that SW-DIAL1, SW-DIAL2
Is input to an up / down counter in the signal input circuit 104, and the rotation click amount of the electronic dial 45 is counted and then transmitted to the CPU 100.

Reference numeral 105 denotes a superimposed LCD 8,
A well-known LCD drive circuit for driving the LCD 19 in the viewfinder and the LCD 41 for monitoring is displayed.
The display content of each LCD is controlled according to the signal from 00.

Reference numeral 111 denotes a printing module, which is a CPU 1
The lamp in the module is turned on by the release signal from 00, and the data imprinting LCD 30 composed of a transmissive liquid crystal
The content of b is transmitted and printed on the film 5. IRED
The driving circuit 106 includes an infrared light emitting diode (IRED 16a).
To 16f) are selectively turned on according to the situation. The shutter control circuit 107 has a magnet MG-1 for running the front curtain and a magnet MG-2 for running the rear curtain when energized.
To expose the photosensitive member with a predetermined amount of light. The motor control circuit 108 controls the motor M1 for winding and rewinding the film and the motor M2 for charging the main mirror 2 and the shutter 4.

The shutter control circuit 107 and the motor control circuit 108 operate a series of camera release sequences.

FIG. 6 is a diagram for explaining the principle of the visual line detection method.
This corresponds to a summary diagram of the optical system for performing the line-of-sight detection of FIG. In FIG. 6, reference numerals 16a and 16b denote light sources such as light-emitting diodes that emit infrared light insensitive to the observer. Each light source is arranged substantially symmetrically in the x direction with respect to the optical axis of the light receiving lens 17, and Is divergently illuminated.
Part of the illumination light reflected by the eyeball 13 is condensed on the image sensor 18 by the light receiving lens 17.

FIG. 7A is a schematic diagram of an eyeball image projected on the image sensor 18, and FIG. 7B is a diagram of the output intensity of the CCD 18.

FIG. 8 shows a schematic flow of gaze detection. The gaze detecting means will be described below with reference to FIGS.

In FIG. 8, when the line of sight detection starts in # 300, in # 301, the light sources 16a and 16b emit infrared light toward the observer's eyeball 13, thereby illuminating the observer's eyeball image. The (virtual image due to corneal reflection) forms an image on the image sensor 18 through the light receiving lens, and the photoelectric conversion is performed by the accumulation operation of the image sensor 18.
The eyeball image can be processed as an electric signal.

In step # 302, the coordinates of the corneal reflection images of the light sources 16a and 16b and the center coordinates of the pupil 13c are obtained from the information of the eyeball image obtained in step # 301. The infrared light emitted from the light source 16b illuminates the cornea 13a of the eyeball 13 of the observer. At this time, a corneal reflection image d (virtual image) formed by a part of the infrared light reflected on the surface of the cornea 13a is received. Lens 1
The light is condensed by 7 and forms an image at a coordinate Xd on the image sensor 18.

Similarly, the infrared light emitted from the light source 16a illuminates the cornea 13a of the eyeball 13. At this time, a corneal reflection image e formed by a part of the infrared light reflected on the surface of the cornea 13a is a light receiving lens. The light is condensed by 17 and forms an image at coordinates Xe on the image sensor 18.

The light beams from the ends a and b of the iris 13b form images of the ends a and b on the coordinates Xa and Xb on the image sensor 18 via the light receiving lens 17. When the rotation angle θ of the optical axis of the eyeball 13 with respect to the optical axis of the light receiving lens 17 is small, the coordinate Xc of the center position c of the pupil 13c is expressed as Xc ≒ (Xa + Xb) / 2.

Further, in # 303, the imaging magnification β of the eyeball image
Is calculated. β is a magnification determined by the position of the eyeball 13 with respect to the light receiving lens 17, and is substantially the interval |
Xd-Xe |. Also#
In 304, since the coordinates of the midpoint of the corneal reflection images Pd and Pe almost coincide with the X coordinate Xo of the center of curvature O of the cornea 13a, the standard distance between the center of curvature O of the cornea 13a and the center C of the pupil 13c is determined. When OC, z-x of the optical axis of the eyeball 13
The rotation angle θx in the plane can be obtained by substantially satisfying the relational expression β * OC * SINθx ≒ ｛(Xd + Xe) / 2｝ −Xc.

FIGS. 6 and 7 show examples of calculating the rotation angle θx when the observer's eyeball rotates in the z-x plane (for example, a horizontal plane).
A rotation angle θ when rotating in a z-plane (eg, a vertical plane)
The same applies to the method of calculating y. When the rotation angles θx and θy of the optical axis of the eyeball 13 of the observer are calculated, in # 305,
For example, in a limited reflex camera, the position (X, Y) of the center c of the pupil 13c on the focusing screen 7 viewed by the observer is: X = m * (Ax * θx + Bx) Y = m * (Ay * βy + By) Is required. Here, m is a constant determined by the finder optical system of the camera, and the rotation angle is determined by the pupil 13c on the focus plate 7.
Is a conversion coefficient to be converted to the coordinates of the center c.

Ax, Bx, Ay, and By are eye-gaze correction coefficients for correcting individual differences in the eye gaze of the observer, and are calculated at the time of injecting each eye gaze when the observer sees two eye-gaps at different positions. The coefficient can be obtained from the rotation angles of a plurality of eyeballs.

After calculating the coordinates of the center c of the pupil 13c on the focus plate 7, the process returns to the main routine in # 306.

FIG. 9 is a flowchart of the operation of the camera having the eye-gaze detecting device according to the present embodiment, which will be described below with reference to FIGS.

When the mode dial 44 is turned to set the camera from a non-operation state to a predetermined shooting mode (this embodiment will be described based on the case where the shutter priority AE is set), the camera is turned on (#). 100), CPU1
The variables used for line-of-sight detection other than the line-of-sight calibration data stored in the EEPROM 100a of 00 are reset (# 101).

The camera stands by until the release button 40 is pressed and the switch SW1 is turned on (# 10).
2). When the signal input circuit 104 detects that the switch SW1 has been turned on, the CPU 100 checks with the visual line detection circuit 101 which calibration data to use when performing visual line detection. At this time, if the calibration data of the confirmed calibration data number is the initial value and is not changed, or is set to the line-of-sight prohibition mode (# 103), the line-of-sight detection is not executed and the focus detection is performed. A specific focus detection area is selected by automatic point selection (# 120).

In the selected focus detection area, the automatic focus detection circuit 103 performs a focus detection operation (# 10).
7). Several methods can be considered as an algorithm for automatic selection of a focus detection point, but a near-point priority algorithm in which a weight is assigned to the center fob distance, which is known in a multipoint AF camera, is effective.

If the line-of-sight calibration data is set to a predetermined calibration data number and it is recognized that the data is input by the photographer, the line-of-sight detection circuit 101 Therefore, the visual axis detection is executed based on the above-described visual axis detection principle (# 104).

At this time, the LCD drive circuit 105 turns on the line-of-sight input mark 60 of the LCD 19 in the finder, and the photographer can confirm on the display 220 outside the finder field of view that the camera is performing line-of-sight detection. It has become. Note that the line of sight detected by the line of sight detection circuit 101 is converted into coordinates of a gazing point on the focus plate 7. The gaze position recognition area for determining the gaze position is shown in FIG.
At 230 to 240.

The CPU 100 determines that the coordinates of the point of interest are in the area 2
It is determined whether it is located in any one of the regions 30 to 240, that is, the line-of-sight position recognition region, and a focus detection point corresponding to the region is selected. In addition, the point of gaze is 230 to 2
If it is not included in any of the areas 40, it is determined that the line of sight cannot be detected, and the line of sight input mark 60 of the LCD in the finder is displayed blinking.

After the CPU 100 selects the focus detection point,
A signal is transmitted to the LCD drive circuit 105, and one of the focus detection point marks 200 to 210 corresponding to the focus detection point is blinked and displayed using the LCD 8 for superimposition (#
105).

At this time, the CPU 100 determines that the gazing point coordinates detected by the line-of-sight detection circuit 101 are inaccurate due to poor detection accuracy, etc.
When the focus detection point mark different from the photographer's will flashes, the photographer recognizes that the focus detection point selected by the photographer's line of sight is incorrect, releases the release button 40, and turns off the switch SW1. (# 106), the camera waits until the switch SW1 is turned on (# 102).

If the photographer continues to turn on the switch SW1 while seeing that the distance measuring point mark corresponding to the line-of-sight position recognition area selected by the line of sight is displayed (# 106), the automatic focusing is performed. The detection circuit 103 performs focus detection using the line sensor corresponding to the selected measurement refusal area (# 107).

At this time, the camera and the photographing lens communicate with each other via the mount contact 28 to drive the focus adjusting circuit 109, and simultaneously, the focal length of the photographing lens mounted is set to CP.
It is stored in U100.

Next, it is determined whether or not focus detection cannot be performed on the selected line-of-sight recognition area (# 108).
100 sends a signal to the LCD drive circuit 105 to blink the focus mark 66 of the LCD 19 in the finder, and warns the photographer that the focus detection is NG (# 121), and S
Continue until Wl is released (# 122).

If detection is possible and the focus adjustment state of the focus detection point selected by a predetermined algorithm is not in focus (# 109), the CPU 100 causes the lens focus adjustment circuit 10
9 to move the projection lens 1 by a predetermined amount (#
120).

After driving the lens, the automatic focus detection circuit 103 performs focus detection again (# 107), and determines whether or not the photographing lens 1 is in focus (# 109).

If the photographing lens 1 is in focus at the selected detection point, the CPU 100 sends a signal to the LCD drive circuit 105 to cause the projector to recognize that the photographing lens 1 is in focus, and The focus mark 66 is turned on, and the blinking display of the distance measuring point mark of the superimposing LCD 8 corresponding to the line-of-sight position recognition area selected by the line of sight is set to the lit state and displayed (# 110).

It should be noted that, as is well known, when focus detection is performed, a defocus amount and an extension amount of the photographing lens are obtained as outputs thereof, and these are stored in the CPU 100.

Next, the photographer sees that the focused detection point is displayed in the viewfinder, recognizes that the detection point is incorrect in position, releases the release button 40, and turns off the switch SW1. (# 111), the camera continues to wait until the switch SW1 is turned on (# 102).

Further, if the photographer looks at the detected point at which the focus is displayed and continues to turn on the switch SW1 (# 1).
11), the CPU 100 transmits a signal to the photometry circuit 102 to cause the photometry circuit 102 to perform the light emission (# 112).

At this time, all the 15 areas are classified based on the specific photometry area including the focused focus detection point, and an evaluation photometry operation is performed by weighting each area according to the classification, and the exposure value is calculated. Is determined.

Then, the exposure value is stored in the LCD in the viewfinder.
19 and the monitor LCD 41. Next, it is determined whether or not the measurement subject measurement button 51 is ON (# 113). If the subject measurement button 51 is ON, the process proceeds to a subject measurement mode subroutine described later (# 11).
4).

If the subject measurement button 51 is off, it is determined whether or not the release button 40 has been pressed and the switch SW2 has been turned on (# 115).

If the switch SW2 is OFF, the state of the switch SW1 is confirmed again (# 111). If switch SW2 is turned on, it is determined whether or not data imprinting is ON (# 116). If data imprinting is ON, the CPU 100 causes the imprinting module 11
1 to send an imprint signal to the LCD 30b for imprinting data.
Is printed on the film 5.

If it is OFF, the CPU 100 transmits signals to the shutter control circuit 107, the motor control circuit 108, and the aperture drive circuit 110, respectively. First, power is supplied to M2 to raise the main mirror 2, and the aperture 22 is stopped down.
G1 is energized to open the leading blade group of the shutter 4. The aperture value of the aperture 22 and the shutter speed of the shutter 4 are determined from the exposure value detected by the photometric circuit 102 and the sensitivity of the photosensitive member 5.

At a predetermined shutter time (for example, 1/250
After the elapse of (sec), the MG2 is energized and the rear blade group of the shutter 4 is closed. When the exposure of the photosensitive member 5 is completed, power is supplied to M2 again, the main mirror 4 goes down, the shutter 4 is charged, and power is also supplied to M1 to perform frame advance of the photosensitive material, and a series of shutter release sequence. Is completed (# 118). Thereafter, the camera waits until the switch SW1 is turned on again (# 102).

FIG. 10 is a flowchart of the subject measurement mode, and FIG. 11 is an explanatory diagram of the display in the finder in the subject measurement mode.

When the signal input circuit 104 detects that the subject measurement button 51 has been pressed and the SW-K has been turned on, the apparatus enters a line-of-sight detection mode for detecting the line-of-sight direction of the photographer, and starts measuring the object (# 400).

Next, the CPU 100 operates the LCD drive circuit 105.
Is driven to display the dimension display segment 260 of the superimposing LCD 8 as shown in FIG. 11A to notify the photographer of the first point input (# 401).

The photographer inputs a line of sight to one end of the object to be measured in accordance with this. The gaze input can be made by pressing the release button 40 and turning on SW1 (# 402).

If SW1 is not turned on, the process waits until SW1 is turned on (# 401).

When the line of sight is input, the line of sight is detected based on the principle of line of sight detection described above (# 403). When the line-of-sight detection is OK (# 404), the measurement index segment corresponding to the coordinates of the first point P1 on the focus plate 7 obtained by the line-of-sight detection to notify the photographer of the line-of-sight input point. The selected item is displayed as shown in FIG. 11A (# 405).

In the gaze position recognition area for determining the gaze position, a gaze detection area is divided corresponding to each measurement index segment in the viewfinder visual field (not shown), and the CPU 100 determines the gaze point. It is determined whether the coordinates are located in any region, that is, in the line-of-sight position recognition region, and a measurement index segment corresponding to the region is selected.

When the line of sight cannot be detected (NG) (# 404)
Blinks the measurement index segment 250 to notify the photographer that the line of sight is NG (# 417), and waits until the line of sight is input again (# 401).

Next, the dimension display segment 260 is shown in FIG.
As shown in (B), the photographer is lit to inform the photographer of the input of the second point (# 406). However, when the user wants to input the first point again, the subject can be input again by pressing the subject measurement button 51. (# 407). Subject measurement button 51
If is not turned on, the photographer will see dimension display segment 2
In accordance with the 60 instruction, the user inputs a line of sight to the opposite end from the input end (# 408).

When no line of sight is input (SW1 is ON
If not, wait until SW1 is turned on (#
406). When the line of sight is input, the line of sight is detected based on the principle of line of sight detection described above (# 409). When the line of sight is OK (# 410), a measurement index segment corresponding to the coordinates of the second point P2 on the focus plate 7 obtained by the line of sight detection is selected to inform the photographer of the line of sight input point. Are displayed as shown in FIG. 11B (#
411).

Since the first measurement index segment maintains the display state, the photographer can check the measured range. When the line of sight is NG (# 410), the measurement index segment 250 is blinked and displayed, and the line of sight is
, And waits until a line of sight is input again (# 406).

Next, the size of the subject image on the focusing screen 7 can be obtained from the coordinates of the first point P1 and the coordinates of the second point P2. ) To calculate the actual size of the subject (# 412).

First, the CPU 1 determines the focal length of the lens obtained by the above-mentioned focus detection and the extension amount of the photographing lens.
The photographing magnification is calculated by the photographing magnification calculating means in 00. When the photographing magnification is M, the amount of extension of the photographing lens is r, and the focal length of the lens is f, the photographing magnification is calculated from the relationship of M = r / f.

Next, assuming that the size of the subject y and the size of the subject image on the focus plate 7 are y ', the subject size calculation means in the CPU 100 calculates the actual size of the subject from the relationship y = y' / M. Can be obtained.

As shown in FIG. 11C, the dimension display segment 260 of the superimposing LCD 8 as a display means is illuminated (# 413) to notify the photographer of the size (dimension) of the subject. . If it is desired to input the second point again as in the case of the first point, it is possible to input the second point again by pressing the subject measurement button 51 (# 414).

At this time, the number of times the subject measurement button 51 is pressed is counted (# 419). If it is once, the input of the second point is awaited (# 406). Waiting (# 401).

When no input is made again, that is, when the subject measurement button 5
If the switch 1 is not turned on, the process returns to the main routine by turning on the switch SW1 (# 416). If the switch 1 is not turned on, the process waits until the switch 1 is turned on (# 41).
4).

When the data imprint mode of the imprint module 111 is ON, it is possible to imprint the calculation result on the photosensitive member 5 as indicated by a box 12.

In the present embodiment, the calculation result by the subject size calculation means is recorded on a recording medium by a data recording device of a camera capable of recording predetermined information together with a photographed image on the recording medium.

[0104]

According to the present invention, it is possible to easily know the size (actual size) of the subject itself by using photographing information (magnification etc.) of the photographing system and visual line information from the visual line detecting means. At the same time, it is possible to achieve an optical device that can leave a record on a film.

In particular, according to the present invention, the size of the subject image formed on the focus plate is obtained by eye-gaze input, and the size of the subject is determined based on the focal length of the taking lens and the photographing magnification obtained from the amount of extension of the taking lens. Is calculated, and superimposed display is performed by the display means in the finder system, so that the size of the subject can be easily known.

Further, since the above calculation result can be recorded on a recording medium, it is possible to obtain an effect such that a video recording without discomfort regardless of the composition of a subject can be left.

[Brief description of the drawings]

FIG. 1 is a schematic diagram when the present invention is applied to a camera.

FIG. 2 is an external view of the camera shown in FIG.

FIG. 3 is an entire display segment of the LCD of a part of FIG. 1;

FIG. 4 is a viewfinder view of FIG. 1;

FIG. 5 is an electric circuit diagram of the camera of FIG. 1;

FIG. 6 is a diagram illustrating the principle of the visual line detection method of FIG. 1;

FIG. 7 is a view for explaining the principle of the visual line detection method in FIG. 1;

FIG. 8 is a flowchart showing an operation of gaze detection in FIG. 1;

FIG. 9 is an operation flowchart of the camera in FIG. 1;

FIG. 10 is a flowchart in a subject measurement mode in FIG. 1;

FIG. 11 is a viewfinder field of view in the subject measurement mode of FIG. 1;

12 is a diagram in which the subject measurement result of FIG. 1 is imprinted on a film.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 photographing lens 6 focus detection device 8 LCD for superimpose 13 eyeball 16 infrared light emitting diode (IRED) 18 image sensor (CCD-EYE) 19 LCD in viewfinder 28 mount contact 30 imprint module 40 release button 51 subject measurement button 101 Eye gaze detection circuit 103 Focus detection circuit 104 Signal input circuit 109 Focus adjustment circuit 200 to 210 Distance measuring point mark 230 to 240 Eye gaze position recognition circuit 250 Measurement index segment 260 Dimension display segment

Continued on the front page F-term (reference) 2H011 AA01 AA02 AA03 DA05 2H051 AA01 AA07 AA08 CB20 DA07 DA24 DA31 EB13 EC04 GA03 GA09 2H102 AA19 AA31 BB08 CA12 5C022 AA13 AB01 AB02 AB12 AB21 AB27 AB66 AC32 AC32 AC31 AC52 AC74 AC77 AC80

Claims (9)

[Claims] 1. An optical apparatus comprising: line-of-sight detection means for detecting line-of-sight information of an observer looking through a finder system; and focus detection means for detecting the focus of a plurality of focus detection areas in a photographing range photographed by a photographing lens. A photographing magnification calculating means for calculating a photographing magnification based on the focal length information of the photographing lens and the subject distance information obtained by the detection result of the focus detecting means; An object size calculating means for calculating the actual size of the object in the photographing range based on the data of (1). 2. The optical apparatus according to claim 1, wherein said subject size calculating means calculates the actual size of the subject using a plurality of pieces of line-of-sight position information from said line-of-sight detecting means. 3. The optical apparatus according to claim 1, wherein a calculation result by said subject size calculation means is superimposed and displayed by a display means in said finder system. 4. The optical apparatus according to claim 3, wherein the display means in the finder system uses a liquid crystal display on which character or non-character information is formed. 5. The optical apparatus according to claim 1, further comprising a data recording unit capable of recording a calculation result of the subject size calculation manual projection together with a photographed image as predetermined information on a recording medium. 6. A line-of-sight detecting means for detecting line-of-sight information of an observer looking into a viewfinder visual field, a focus detecting means for detecting a focus state in a plurality of areas in a viewfinder visual field of a photographing system, and photographing of the photographing system. An optical apparatus, comprising: subject calculation means for calculating the size of the subject from information and line-of-sight information in a finder visual field detected by the line-of-sight detection means. 7. A sight line detecting means for detecting sight line information of an observer who looks into a finder field of view forming an object image by a photographic lens, a photographic magnification calculating means for calculating a photographic magnification of the photographic lens, and the sight line detecting means. An optical apparatus comprising: a subject size calculating unit configured to calculate an actual size of the subject based on data from the photographing magnification calculating unit. 8. The optical apparatus according to claim 7, wherein said subject size calculating means calculates the size of the subject based on a plurality of pieces of line-of-sight position information from said line-of-sight detecting means. 9. The optical apparatus according to claim 8, wherein a calculation result by said subject size calculation means is superimposed and displayed by a display means in a finder system.