JPH10210327A - Camera equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the camera equipment that indicates an accurate scale, even during zoom adjustment. SOLUTION: A lens section 1 including a zoom lens 1a and a focus lens 1b receives an image of an image pickup range. An image signal output section 3, including an image-pickup section 3 of a prescribed size generates and provides an output of an image signal. A zoom lens position measurement section 2a measures the position of the zoom lens 1a. A focus lens position measurement section 2b measures a position of the focus lens 1b. An arithmetic section 5 calculates an object distance and a focal distance, based on the position of the zoom lens and the position of the focus lens. A range calculation section calculates a size of the image-pickup range, based on the position of the zoom lens and the position of the focus lens. A scale setting section 9 sets a scale, based on the calculated size of the image-pickup range and the size of the image-pickup section 3a. A display section 12 indicates a scale, based on the set scale and an image signal outputted from the image signal output section 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera device for displaying an acquired image and a scale, and more particularly to a camera device having a zoom function.

[0002]

2. Description of the Related Art Conventionally, there are a microscope, an endoscope camera and the like as a camera device which mainly focuses on displaying an acquired image on a monitor or the like.

A general configuration of a single focus microscope used for inspection of electronic component semiconductors having extremely small parts, animals, plants, skin, hair, and the like will be described with reference to the drawings. FIG. 6 is a diagram showing a basic configuration of a single focus microscope.

[0004] The microscope comprises a monitor unit 100,
It comprises a controller unit 110 and a probe unit 120. The probe unit 120 includes a CCD (Charge Coupled Device) camera 122 equipped with a micro ring light 121, a single focus lens 123, and a light collecting cap 124.

[0005] The microscope shown in the figure is a contact type, and the probe unit 120 is used in contact with a subject. The focus of the lens 123 is previously adjusted to the tip of the condenser cap 124, and when using another lens,
Use another light-collecting cap that is also in focus.

[0006] The light supplied from the controller unit 110 includes a micro ring light 121 and a light collecting cap 124.
After that, the light is irradiated on the subject in contact with the tip of the probe unit 120. The image captured through the lens 123 is displayed on the monitor 100 after being subjected to brightness adjustment and the like by the controller 110.

By the way, if such a microscope has a function of displaying an image and a scale for the image at the same time, the actual size of the subject can be known at the time of inspection or the like, which is very convenient.

In order to set a scale for an image, the size of the imaging range and the size of the imaging unit of the CCD camera 122 need to be known. Among them, the size of the imaging unit is determined by the specifications of the microscope.

The size of the imaging range of the microscope includes the size of the imaging section of the CCD camera 122, the distance between the subject and the lens 123 (subject distance), and the size of the lens 12.
3 focal length. If the lens to be used is determined, the condenser cap is determined, so that the focal length and the subject distance are determined.

Therefore, if the lens to be used is determined, the imaging range is determined at that time, and the scale can be set. The case where the scale is displayed on the contact type microscope has been described above. However, even when the non-contact type is used, if the subject and the microscope are fixed by a stand or the like and the subject distance is constant, the scale is similarly displayed. Can be set.

[0011]

However, in order to set the scale by the above method, the subject distance and the focal length must be constant. Therefore, when using a lens with a variable subject distance and focal length, such as a zoom lens, unless the subject distance and focal length are completely fixed at specific positions or scale settings are made externally, Scale display was difficult.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and it is an object of the present invention to provide a camera device which displays an acquired image and a scale, and which can display an accurate scale even during zoom adjustment. Aim.

[0013]

According to the present invention, in order to solve the above-mentioned problems, a camera device for displaying an acquired image and a scale includes a zoom lens and a focus lens, and a lens for capturing an image of a subject in an imaging range. An image signal output unit that generates and outputs an image signal from the image, a zoom lens position measuring unit that measures the position of the zoom lens, and a position that measures the position of the focus lens. Focus lens position measuring means, calculating means for calculating a subject distance and a focal length from the zoom lens position and the focus lens position, and calculating the size of the imaging range from the subject distance and the focal length. A range calculating means for calculating, and a scale setting based on the size of the imaging range and the size of the imaging unit. And Cormorant scale setting means, a camera and wherein is provided that has a display means for displaying the scale with the image signal based on the scale setting.

When displaying an acquired image and a scale with the camera device having such a configuration, a lens unit including a zoom lens and a focus lens captures an image of a subject in an imaging range. Then, an image signal output unit including an image pickup unit of a predetermined size generates and outputs an image signal from the image. The zoom lens position measuring means measures the position of the zoom lens. The focus lens position measuring means measures the position of the focus lens. The calculating means calculates a subject distance and a focal length from the zoom lens position and the focus lens position. The range calculation means calculates the size of the imaging range from the subject distance and the focal length. The scale setting means sets a scale based on the size of the imaging range and the size of the imaging unit. The display means displays a scale and an image signal based on the scale setting.

In such a camera device, the subject distance and the focal length are calculated from the positions of the zoom lens and the focus lens during image capturing, the size of the imaging range is obtained, and the scale is set. Therefore, accurate scale display is possible without requiring fixing of the zoom lens or the focus lens at a specific position or setting from outside.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing the principle configuration of the camera device of the present invention.

In the camera device of the present invention, first, the lens unit 1
And a zoom lens position measurement unit 2a, a focus lens position measurement unit 2b, and an image signal output unit 3.
The lens unit 1 includes a large number of lens groups, and includes a zoom lens 1a and a focus lens 1b. When a subject (not shown) exists on the left side of the figure, the lens unit 1 captures an image of the subject. This range is reduced or reduced mainly by moving the zoom lens 1a left and right in the figure. It is enlarged. This image is focused or blurred mainly by moving the focus lens 1b right and left in the figure.

The zoom lens position measuring section 2a measures the position of the zoom lens 1a and inputs the measurement result to the arithmetic section 5. Further, the focus lens position measuring section 2b measures the position of the focus lens 1b and inputs the measurement result to the arithmetic section 5.

The image signal output unit 3 is a CCD (Charge Coup).
led Device) Imaging unit 3a and sample hold (S /
H) and AGC (Automatic Gain Control) 3b, and A
/ D (Analog Digital) converter 3c and camera process 3
d and an encoder 3e.

The image captured by the lens unit 1 is a CC
The signal is converted into an electric signal by the D imaging unit 3a and output. Therefore, the shape and size of the imaging range are determined by the CCD imaging unit 3.
The relationship is similar to the shape and size of the imaging surface a. S
/ H and AGC 3b sample this electric signal into a certain amount of signal and output it. The A / D converter 3c converts the sampled electric signal into a digital signal and outputs the digital signal.

The camera process 3d includes a white balance circuit that corrects the color balance of the acquired image on the basis of white (R: G: B = 1: 1: 1), a color balance and a signal output. This means general camera process processing such as a gamma correction circuit for correcting a ratio. The encoder 3e converts the input electric signal into an NTSC (National Telephone
evision System Committee) Encode the signal and output.

The camera apparatus of the present invention further comprises an FE (Focus
Error) includes a generation unit 4, a calculation unit 5, a distance correspondence data storage unit 6, a zoom lens moving unit 7a, and a focus lens moving unit 7b.

The FE generator 4 detects the A / D converted electric signal, and generates a focus error signal if the electric signal is out of focus. The generated focus error signal is input to the arithmetic unit 5.

The arithmetic unit 5 is connected to a distance correspondence data storage unit 6, which compares the position of the zoom lens 1a and the position of the focus lens 1b with this data.
When the object distance and the focal length are obtained, the range calculation unit 8
To enter. The calculation unit 5 also controls the zoom lens moving unit 7a and the focus lens moving unit 7b. That is, when the focus error signal is input from the FE generation unit 4, the focus lens moving unit 7b is controlled to move the focus lens 1b.

The distance-corresponding data storage section 6 previously stores the object distance and the focal length corresponding to the position of the zoom lens and the position of the focus lens. This data will be described later with reference to the drawings.

The zoom lens moving section 7a moves the zoom lens 1a. The focus lens moving unit 7b
Moves the focus lens 1b. The camera device of the present invention further includes a range calculating unit 8 and a scale setting unit 9.
, A switch unit 10, an adder 11, and a display unit 12.

The range calculation unit 8 calculates the size of the imaging range from the subject distance and the focal length, and inputs the size to the scale setting unit 9. The scale setting unit 9 calculates an appropriate scale value from the size of the input imaging range and outputs a signal for scale setting. The switch unit 10 switches whether to display the scale or not.

When the switch 10 selects the display of the scale, the adder 11 outputs the image signal output from the encoder 3 e of the image signal output unit 3 and the scale setting output from the scale setting unit 9. And outputs the result to the display unit 12. When the switch section 10 selects not to display the scale, only the image signal is output to the display section 12. The display unit 12 includes the adder 11
An image is displayed according to the input signal from.

Here, a method for obtaining the size of the image pickup range from the position of the zoom lens and the position of the focus lens will be described. FIG. 2 is a diagram for explaining how to determine the size of the imaging range.

In this figure, the lens section 1 is schematically shown in the form of a convex lens. The lens unit 1 changes the angle of view w by moving left and right in the figure, and obtains an image on the CCD imaging unit 3a. At this time, the size Y of the imaging range is approximated by the following equation (1).

[0031]

Y = y × I / f (1) Here, the image size y is a value that depends on the size of the CCD imaging unit 3a and is a constant value. The object distance shown in the figure is used as an approximate value of the subject distance I, and the image distance is used as an approximate value of the focal length f. Thus, for example, 1
/ 2 "CCD (6.4 mm long, 4.8 mm wide), the subject distance I ≒ 1 m and the focal length f ≒ 8 mm
If the actual size of the imaging range, a vertical Y ₁ is the following formula (2), the horizontal Y ₂ is expressed by the following equation (3).

[0032]

Y ₂ = 6.4 × 10 ⁻³ × 1 / (8.0 × 10 ⁻³ ) = 0.8 (m) (2)

[0033]

Y ₃ = 4.8 × 10 ⁻³ × 1 / (8.0 × 10 ⁻³ ) = 0.6 (m) Similarly, subject distance I ≒ 1 m, focal length f ≒ 40 mm, then the actual size of the imaging range, a vertical Y ₄ have the following formula (4)
Where Y ₅ is represented by the following equation (5).

[0034]

Y ₄ = 6.8 × 10 ⁻³ × 1 / (40.0 × 10 ⁻³ ) = 0.16 (m) (4)

[0035]

Y ₅ = 4.8 × 10 ⁻³ × 1 / (40.0 × 10 ⁻³ ) = 0.12 (m) Next, the lens unit 1 shown in FIG. The correspondence with the distance correspondence data will be described with an example.

FIG. 3 is a diagram showing an example of the internal configuration of the lens unit 1 shown in FIG. The inner focus lens 20 is an example of a lens that can be used as the lens unit 1. This lens includes a first group lens 21, a second group lens 22, a third group lens 23, and a fourth group lens 24 therein.
3 is fixed here.

The second group lens 22 and the fourth group lens 24 are movable left and right in the figure. The second group lens 22 includes a guide pin 22a provided in parallel and a screw shaft 22b.
And is held by a support tool 22c which is vertically passed to the support member 22c. The screw shaft 22b is also a rotation shaft of the DC motor 22d, and transmits the rotation of the DC motor 22d to the second group lens 22. The support 22c is provided with a potentiometer 22e for measuring the position of the second group lens 22.

When the inner focus lens 20 is applied as the lens unit 1 shown in FIG.
1 corresponds to the zoom lens 1a of FIG.
Corresponds to the focus lens 1b. At this time, the potentiometer 22e corresponds to the zoom lens position measuring unit 2a in FIG. 1, and the DC motor 22d corresponds to the zoom lens moving unit 7a in FIG.

Although not shown here, an object detecting means such as a photo interrupter is used as the focus position measuring section 2b shown in FIG. 1, and a minute motor such as a step motor is used as the focus lens moving section 7b shown in FIG. Driving means that enables control is applied. After the origin is detected using the photo interrupter, the position can be detected by counting the number of pulses of the step motor. Alternatively, a method may be adopted in which a magnet scale is integrated with the lens, an MR sensor is provided as the focus position measurement unit 2b, and position detection is performed with high resolution.

FIG. 4 is a cam curve graph showing an example of distance correspondence data when the inner focus lens 20 shown in FIG. The cam curve graph is stored in the distance correspondence data storage unit 6 corresponding to the configuration of the lens unit 1. Here, the cam curve graph is a graph in which the horizontal axis indicates the position of the zoom lens and the vertical axis indicates the position of the focus lens, and indicates the subject distance I based on the relationship between the two.

The fact that the second lens group 22 shown in FIG. 3 is moved to the left means that the cam curve graph shown in FIG.
In response to approaching the “ide end”, the captured image is wide (wide angle). Conversely, moving the second lens group 22 shown in FIG. 3 rightward corresponds to the cam curve graph shown in FIG. 4 approaching the “tele end”, and the captured image is zoomed (enlarged). ).

Similarly, moving the fourth lens group 24 shown in FIG. 3 to the left corresponds to the cam curve graph shown in FIG. 4 approaching "closer", and the focus of the captured image is Close to the camera. Moving the fourth lens group 24 shown in FIG. 3 to the right corresponds to the cam curve graph shown in FIG. 4 approaching “far”, and the focus of the captured image is far from the camera.

The calculation unit 5 applies the input positions of the zoom lens and the focus lens to the cam curve graph. That is, when the zoom lens is at the position a and the focus lens is at the position b, the subject distance I is the intersection B between a and b, that is, 50 mm. When the focus lens moves to the position c while the zoom lens remains at the position a, the subject distance I is the intersection C between a and c, that is, 250 mm.

The distance-corresponding data storage section 6 also stores a graph indicating the focal length f. Here, a procedure for performing scale display during zoom and focus adjustment in the camera device of the present invention will be described.

FIG. 5 is a flowchart showing a procedure for causing the scale display to follow the zoom and focus adjustments. The arithmetic unit 5 first initializes the focus lens, that is, measures the position of the focus lens, and stores the information in a register or the like in the arithmetic unit 5 (step S1). If the zoom adjustment is performed, the position information of the zoom lens is measured (step S2), and if the focus adjustment is performed, the position information of the focus lens is measured and stored in a register or the like (step S3). Next, the arithmetic unit 5 compares the held position information of the zoom lens and the focus lens with the distance correspondence data, and obtains the subject distance I and the focal length f (step S4). When the obtained I and f are input to the range calculation unit 8, the range calculation unit 8 calculates the imaging range y (Step S5). When the calculated y is input to the scale setting means 9, the scale setting means 9 determines an appropriate value of one scale of the scale and a display width (step S).
6) The display means 12 displays the scale based on this determination (step S7).

Thereafter, if it is necessary to readjust the zoom (step S8), the process proceeds to step S2 again. If the focus needs to be readjusted (step S9), the process proceeds to step S3 again. Until the power is turned off (step S10), the processing of this flowchart is continued.

Although an inner focus lens as shown in FIG. 3 is used as the lens unit 1 in the above description, a lens that focuses on the front lens may be used as the lens unit 1. In this case, the subject distance I is at the position of the focus lens, the focal length f is at the position of the zoom lens,
Depends on the value.

Although only the scale display has been described in the above description, two points in the image displayed in the same procedure are designated by a pointing device such as a mouse, and the like.
It is also possible to calculate and display the actual length between two points.

[0049]

As described above, the camera apparatus of the present invention measures the positions of the zoom lens and the focus lens, calculates the subject distance and the focal length from the positional relationship between them, and obtains the size of the imaging range. Since the scale is set, the scale can be displayed accurately even during the zoom adjustment.

[Brief description of the drawings]

FIG. 1 is a diagram showing a principle configuration of a camera device of the present invention.

FIG. 2 is a diagram for explaining how to determine the size of an imaging range.

FIG. 3 is a diagram illustrating an example of an internal configuration of a lens unit illustrated in FIG. 1;

4 is a cam curve graph showing an example of distance correspondence data when the inner focus lens shown in FIG. 3 is applied to a lens unit.

FIG. 5 is a flowchart showing a procedure for causing a scale display to follow zoom and focus adjustments.

FIG. 6 is a diagram showing a basic configuration of a single focus microscope.

[Explanation of symbols]

Reference numeral 1 ... Lens section, 1a ... Zoom lens, 1b ... Focus lens, 2a ... Zoom lens position measurement section, 2b
... Focus lens position measuring section, 3 ... Image signal output section, 3a ... CCD imaging section, 3b ... S / H and AG
C, 3c: A / D converter, 3d: Camera process,
3e: encoder, 4: FE generation unit, 5: calculation unit, 5: distance correspondence data storage unit, 7a: zoom lens moving unit, 7b ... focus lens moving unit, 8: range calculation unit 9: Scale setting unit, 10: Switch unit, 11: Adder, 12: Display unit.

Claims (3)

[Claims] 1. A camera device for displaying an acquired image and a scale, comprising: a lens unit including a zoom lens and a focus lens for capturing an image of a subject in an imaging range; and an imaging unit having a predetermined size. Image signal output means for generating and outputting an image signal; zoom lens position measurement means for measuring the position of the zoom lens; focus lens position measurement means for measuring the position of the focus lens; Calculating means for calculating a subject distance and a focal length from a lens position; range calculating means for calculating a size of the imaging range from the subject distance and the focal length; a size of the imaging range and the imaging unit Scale setting means for performing scale setting based on the size of The camera apparatus characterized by comprising display means for displaying the scale with the image signal. 2. The apparatus according to claim 1, further comprising a focus error signal generating unit configured to generate a focus error signal when the image is out of focus, wherein the arithmetic unit controls the focus lens moving unit based on the focus error signal. The camera device according to claim 1, wherein: 3. The arithmetic unit includes a distance correspondence data storage unit that stores a correspondence relationship between the zoom lens position and the focus lens, and a correspondence relationship between the subject distance and the focal length. 2. The camera device according to 1.