JP2001346086A - Digital camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a digital camera that can photograph an image that is well focused on a desired object. SOLUTION: In this digital camera, image data are stored in a RAM for every time when a lens section 3 respectively comes into focus with a person 31, a plant 32, a building 33, a remote structure 34 and a mountain 35 that are in-area objects by one photographing. That is, since the digital camera respectively matches the focus of the lens section with the respective objects that are included in a range finding area and whose distance respectively differs from the digital camera and applies the photographing to the objects, the digital camera can photograph an image well focused to a desired object. Desired image data can be selected among the photographed image data and the remaining data other than the selected image data and stored in the RAM can be deleted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a digital camera.

[0002]

2. Description of the Related Art Conventionally, there has been known a digital camera which converts light from a subject into an electric signal by an optical sensor such as a CCD, converts the converted electric signal into digital data, and records the digital data on a recording medium such as a flash memory. ing. By using a digital camera, it is possible to easily store digital data of an image captured using a personal computer or the like and perform various processings by an individual. In addition, by outputting digital data to a printer, a photograph can be printed without developing the film. Recently, with the improvement of the print quality of a printer, it has become possible to output a high-quality photograph indistinguishable from a silver halide photograph.

[0003]

Not only digital cameras but also cameras for taking silver halide photographs (hereinafter referred to as silver halide cameras) have an automatic focus adjustment function for automatically focusing a lens on a subject, that is, a so-called automatic focus adjustment function. Some have an autofocus function.

[0004] The autofocus function will be briefly described. Light from the subject is formed as an image 100 as shown in FIG. 7 inside the camera, and a distance measurement area 101 is set in a part of the formed image 100. Here, ranging refers to measuring a distance from a lens group of a camera to a subject. Then, the distance measurement of the subject 102 in the area mainly included in the distance measurement area 101 is performed. The focus adjusting means automatically focuses the lens on the subject in the image 100 based on the measured distance to the subject in the area.

However, as shown in FIG. 7, there are a plurality of subjects at different angles from the camera lens within the angle of view of the camera, and
When b is not included in the distance measurement area 101, the focus adjusting unit focuses the lens on the subject 102 which is the background. As a result, if the photographing is performed as it is, the photographed photograph may not be focused on a desired subject, that is, a so-called defocus may occur.

In a camera having a conventional autofocus function in order to prevent defocus, for example, the following operation is required. (1) With the desired subject 103a or 103b included in the ranging area 101, the shutter button is set to a half shutter, and the lens is focused on the desired subject 103a or 103b. The half shutter is a state in which the shutter button is pressed halfway through the movable range. Then, the camera is moved to a position where a desired composition is obtained while maintaining the half shutter state.

(2) A desired subject 103a or 103 is selected from the images displayed on the viewfinder.
The user selects b and measures the distance to the subject. As a method of selecting a subject, for example, there is a method of selecting based on the line of sight of the subject, or a method of selecting a subject on the camera side and selecting by the selecting unit.

However, in the case of going through the half shutter state as in the above (1), the user needs to point the camera at the subject once and then further adjust the angle of view at the time of shooting, which makes the execution of shooting inconvenient. is there. Further, if a means for selecting a desired subject is separately provided as in (2), there is a problem that the structure of the camera becomes complicated and the cost increases.

It is an object of the present invention to provide a digital camera which captures an image focused on a desired subject with a simple structure.

[0010]

According to the digital camera of the present invention, the focus of the lens is adjusted to a plurality of distances, and the image data obtained by converting the light from the subject every time the focus of the lens is stored. Store in the department. In other words, the subject is focused and photographed at a position at a different distance from the digital camera. Therefore, the plurality of captured images include an image focused on a desired subject. Therefore, it is possible to shoot an image in which a desired subject is in focus. Further, since it is not necessary to add a means for selecting a desired subject to the digital camera, the structure of the digital camera does not become complicated, and the manufacturing cost does not increase.

According to the digital camera of the present invention, desired image data can be selected from a plurality of image data stored in the storage unit. Further, the remaining image data stored in the storage unit as image data other than the selected image data can be deleted. Therefore, there is no need to store image data of unnecessary images, and for example, the amount of image data to be recorded on a recording medium or the like can be reduced.

According to the digital camera of the third aspect of the present invention, the focus adjusting means has a distance measuring means for measuring a distance to a subject at a different distance from the lens. The distance measuring means measures the distance to the subject by using, for example, an evaluation function. The lens moving means moves the lens based on the measured distance, and focuses the lens on the subject. Therefore, the focus of the lens can be reliably adjusted to the subject at a different distance from the lens.

According to the digital camera of the fourth aspect of the present invention, the depth of field table is stored in the storage means. The digital camera calculates an aperture value and a shutter speed at the time of shooting based on the brightness of the subject. The distance that can be photographed by the lens of the digital camera is calculated from the depth-of-field table corresponding to the calculated aperture value, and the lens position is moved according to the calculated distance to focus the lens. For example, when the aperture value increases, the depth of field becomes deeper, so that it is possible to shoot an object from the vicinity of the digital camera to an infinite distance by setting only a few possible distances without defocusing. Therefore, the focus of the lens can be reliably adjusted to the subject at a different distance from the lens.

[0014]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a first embodiment of the present invention; (First Embodiment) FIG. 2 shows a digital camera according to a first embodiment of the present invention. As shown in FIG. 2, the digital camera 1 includes a control unit 2, a lens unit 3, a focus adjusting unit, a CCD (Charge Coupled Device) 5 and an A / D converter 6 as an imaging unit, and a RAM (Random Acces) as a storage unit.
s Memory) 7, image creation unit 8, LCD (Liquid Crystal)
Display 9, VRAM (Video RAM) 10, flash memory 11, interface 12, shutter button 13, input unit 14, and the like.

The control unit 2 has a CPU (Central Processing).
Unit) and a ROM in which programs for performing various controls of the digital camera 1 are recorded. The control unit 2 is connected with a shutter button 13 for instructing start of photographing and an input unit 14 for inputting a plurality of setting information to the digital camera 1.

Further, the control unit 2 includes a distance measuring means for calculating an evaluation function for measuring a distance from the lens unit 3 of the digital camera 1 to the subject, and a CCD 5 for each time the lens moving means 4 focuses on the subject. It also functions as a photographing unit that outputs the sensed light from the subject as image data to the RAM 7 and instructs when to store it.

The lens unit 3 collects light from a subject, and
Inject into CD5. As the CCD 5 of the imaging unit, C (Cy
an), M (Magenta), Y (Yellow), and G (Green). A color image is captured by using the CCD 5 in which imaging devices having complementary color filters are arranged on a matrix. As the complementary color filters, filters of three colors C, M, and Y may be used. R (Red), G (Gree
n) A CCD having a primary color filter of B (Blue) may be used. In addition, as an imaging unit of the imaging unit, C
For example, CMOS (Complementary Metal-
It is also possible to use an imaging means such as an Oxide Semiconductor sensor.

The focus adjusting means has a distance measuring means for measuring a distance to a subject and a lens moving means 4 for moving the lens unit 3. The lens unit 3 is formed by combining a plurality of convex lenses and concave lenses, and the lens moving unit 4 focuses on the subject by moving the plurality of lenses. The lens moving unit 4 uses a stepping motor (not shown) to move the lens of the lens unit 3 at predetermined intervals.

The A / D converter 6 converts light from a subject into digital data by converting an analog electric signal output from the CCD 5 into a digital signal. R
The AM 7 temporarily stores digital data converted by the A / D converter 6 or image data obtained by expanding compressed image data recorded in the flash memory 11. RA
DR7 having a self-refresh function as M7
M (DynamicRAM) is used.

The LCD 9 displays an image created from the image data. The LCD 9 is used as a viewfinder at the time of photographing, and reproduces and displays an image based on the compressed image data recorded in the flash memory 11. V
Image data of an image displayed on the LCD 9 is written into the RAM 10 as needed.

The flash memory 11 is a rewritable storage medium capable of retaining the contents of recorded data without power supply. The flash memory 11 is built in the digital camera 1 or is detachably provided in a card slot (not shown) of the digital camera 1. As the flash memory 11, for example, by using a memory card conforming to the PCMCIA standard or a memory card attached to a PCMCIA card adapter, the contents of the flash memory 11 can be directly read and written by a personal computer having a PCMCIA card slot.

The interface 12 is connected to a cable for outputting the contents stored in the flash memory 11 to an external processing device such as a personal computer. The standard of the interface 12 is a parallel system or a USB (Universal Serial
Bus) method is used.

The shutter button 13 reciprocates vertically in FIG. The control unit 2 distinguishes between a “half-pressed” state in which the shutter button 13 is pressed halfway through the movable range and a “full-pressed” state in which the shutter button 13 is pressed close to the limit of the movable range via a shutter stroke detection unit (not shown). recognize.

The image creating section 8 creates an image 20 as shown in FIG. 1 based on the light from the subject incident on the CCD 5,
A plurality of distance measurement areas 21 are set in the image 20. Then, the lens moving unit 4 moves the lens unit 3 and calculates an index representing the sharpness of the image every time the lens unit 3 is located at a predetermined position. The calculation of this index is performed by moving the lens unit 3 so that the position at which the difference between the pixel data becomes the largest,
That is, the search is performed by searching for a position where a clear image can be obtained.

The distance measuring means creates an evaluation function for calculating an index of the sharpness of a predetermined image for each distance measuring area from light incident on the CCD 5 from the subject. These evaluation functions are shown in FIG.
Is calculated by the control unit 2 shown in FIG. This allows
An evaluation result as shown in FIG. 3 is created for each area.
Each area of the distance measurement area 21 is given a predetermined weight in advance, and the evaluation result is added according to the weight. By changing the weight, the subject of interest can be changed. From the peak of this evaluation result, an optimum focus of the subject which is the main subject for each evaluation function in which the position and the weight of the lens unit 3 are changed can be obtained. Thereby, the distance from the digital camera 1 to the subject 30 becomes clear.

As described above, for example, when the lens moving means 4 drives the lens unit 3 at predetermined intervals by the stepping motor of the lens moving means 4, the index of the subject in the area is calculated for each step position and stored in the RAM 7. Let it.

The digital camera 1 has an image selecting means for selecting a desired image from a plurality of photographed images. The image selecting means selects, for example, an image desired to be recorded in the flash memory 11 or an image not desired to be recorded in the flash memory 11 by the input unit 14 while viewing the image displayed on the LCD 9.

An image other than the image desired to be recorded in the flash memory 11 selected by the image selecting means, that is, an image not desired to be recorded, corresponds to the image in order to secure the storage capacity of the RAM 7 and the flash memory 11. The image data is erased by the image erasing means.

Next, the operation of the digital camera 1 of the first embodiment will be described. In the description of the operation, a digital camera in which five distance measurement areas 21 are set as shown in FIG. 1 will be described for simplicity. First, the positional relationship between the digital camera 1 and the subject 30 shown in FIGS. 1 and 4 will be described.

As shown in FIG. 1, five ranging areas A, B, C, D and E are set in an image 20 to be photographed. Further, the image to be photographed includes a person 30, a plant 32, a building 33, a distant structure 34, a mountain 35, and the like as the subject 30. As shown in FIG. 4, these subjects 30 are arranged in the order of a person 31, a plant 32, a building 33, a distant structure 34, and a mountain 35 from the side closer to the digital camera 1.

The subject in the area, which is the subject mainly included in each ranging area shown in FIG. 1, is as follows. Distance measurement area A: person 31, mountain 35 Distance measurement area B: mountain 35 Distance measurement area C: plant 32, mountain 35 Distance measurement area D: person 31, distant structure 34, mountain 35 Distance measurement area E: building 33, mountain 35

FIG. 3 is a graph of an evaluation function indicating the distance from the lens unit 3 to the subject 30 for each of the distance measurement areas.
It becomes as shown in. In each graph, the vertical axis indicates the intensity of light from the subject, and the horizontal axis indicates the distance to the subject, that is, the number of steps of the stepping motor. The number of steps is 10 steps from the shortest focus to the longest focus for simplicity.

From the above, the distance from the lens unit 3 to the person 31 corresponds to the number of steps = 2. Similarly, the number of steps to the plant 32 = 4, the number of steps to the building 33 = 6, and the distant structure 34 The number of steps up to の = 7, and the number of steps up to the ridge 35 = 10.

Next, the photographing procedure and the operation of the digital camera 1 will be described. (1) Turn on the power switch (not shown) of the digital camera 1 and turn on the mode switch (not shown)
In the “ew” mode, the power of each unit of the digital camera 1 is turned on. The light from the subject, which is received by the CCD 5 every few seconds to several tenths of a second, is converted into a moving image by LC
Displayed at D9.

(2) When the user sets the shutter button 13 to "half shutter", the lens moving means 4 moves the lens unit 3 from the shortest focus position to the longest focus position. Then, the image creating section 8 forms the light from the subject 30 received by the CCD 5 as an image 20 as shown in FIG. The control unit 2 divides the image into the set distance measurement areas 21 and creates an evaluation function as shown in FIG. 3 for each distance measurement area. The lens moving means 4 may move the lens unit 3 from the position of the longest focus to the position of the shortest focus.

(3) The subject in the area for each of the distance measurement areas A, B, C, D, and E is extracted from the peak of the created evaluation function, and the subject 31 in the area, the plant 32, and the building 3 are extracted.
3. The distance from the lens unit 3 to the distant structure 34 and the mountain 35 is measured. The distance from the lens unit 3 to the subject in the area is measured as the number of steps of the stepping motor. Then, the measured distance from the lens unit 3 to the subject in the area, that is, the number of steps of the stepping motor is stored in the RAM 7.

(4) When the user sets the shutter button 13 to “full shutter”, the control unit 2 drives the lens moving unit 4 according to the number of steps of the stepping motor stored in the RAM 7. Then, the focus of the lens unit 3 is adjusted on the subject in the extracted area.

(5) The control unit 2 performs stepping at a predetermined position each time the lens unit 3 focuses on a person 31, a plant 32, a building 33, a distant structure 34, and a mountain 35, which are objects in the area. Shooting is performed each time the motor is positioned. The photographing is executed by the following processing.

When the lens unit 3 is positioned at a predetermined position by the lens moving means 4, all the electric charges accumulated in the CCD 5 are once discharged, and then the light from the subject 30 condensed by the lens unit 3 enters the CCD 5. . The CCD 5 outputs the amount of electric charge according to the amount of incident light as an electric signal. As the charge storage time in the CCD 5, one or both of a mechanical shutter and an electronic shutter for controlling the charge storage time itself in the CCD 5 are used.
The electric signal output from the CCD 5 is converted into a digital signal by the A / D converter 6. The digital signal converted from the electric signal is transferred to a DMA (Direct Memor
y Access), the address of the RAM 7 is directly designated and stored without passing through the control unit 2. Lens part 3 at a predetermined position
Each time is located, the above processing is repeatedly performed, and the person 31, the plant 32, the building 33, the distant structure 34, and the mountain 35 included in the ranging area 21 are photographed.

(6) By performing the above processing, the lens unit 3 focuses on the person 31, the plant 32, the building 33, the distant structure 34, and the mountain 35 included in the ranging area 21. A number of images are taken. However, when there is no change in the distance from the lens unit 3 to the subject in each distance measurement area, for example, when only a distant subject is photographed, the number of images to be photographed may be five or less.

(7) The photographed images are displayed on the LCD 9 after photographing is completed. The user looks at the image displayed on the LCD 9 and selects an image focused on the desired subject by the image selecting means. As the image selecting means, for example, an input unit 14 such as a push button provided around the LCD 9 of the digital camera 1 is used. A plurality of images may be selected.

(8) The image data of the selected image is
After various corrections such as white balance adjustment, color information interpolation processing, and color correction are performed, an appropriate color image is generated. In order to increase the number of recordings on the flash memory 11, for example, JPEG (Joint Photog
The image data is compressed into image data in a file format such as an image file of a raphic expert group, and is generated as image data having a small data size. Then, the image data is copied and recorded in the flash memory 11 as a JPEG file.

Here, image data of an image stored in the RAM 7 but not desired to be recorded in the flash memory 11, that is, image data other than the selected image is
The image is erased by the image erasing means. The erasing of the image data by the image erasing means is performed according to an instruction from the control unit 2.
Stops holding the image data stored in
This is performed by stopping the power supply to the image data storage area of the AM 7.

As described above, according to the digital camera 1 of the first embodiment, the subject 31, the plant 32, the building 33, the distant structure 34,
The image data is stored in the RAM 7 each time the lens unit 3 is focused on the peak 35. That is, a plurality of subjects 30 included in the ranging area and having different distances from the digital camera 1.
, The focus of the lens unit 3 is adjusted, and photographing is performed. Therefore, it is possible to shoot an image in which a desired subject is in focus.

Further, desired image data can be selected from a plurality of photographed image data, and the remaining image data other than the selected image data and stored in the RAM 7 is deleted. Can be. Therefore, there is no need to store image data of unnecessary images, and the amount of image data recorded in the flash memory 11 can be reduced.

Further, the RAM 7 can store the measured distance from the lens unit 3 to the subject 30. Therefore, in the case of the lens moving means 4 for adjusting the focal length by reciprocating the lens unit 3 in the direction of the subject, for example, distance measurement is performed on the subject 30 on the outward path, and the subject 3 is measured on the return path.
The photographing can be performed while focusing the lens unit 3 at 0. Therefore, photographing can be performed in a short time, and the operation time of the lens moving unit 4 can be shortened, so that power consumption can be reduced.

Even in the case of the conventional silver halide camera, it is possible to perform photographing every time the lens is focused on the subject, similarly to the digital camera 1 of the first embodiment. However, if a silver halide camera shoots a plurality of subjects at different distances each time the subject is focused, a plurality of photos are taken for each shooting, which increases the consumption of film, which is not practical. On the other hand, the digital camera 1 of the first embodiment can record only the image desired by the user in the flash memory 11 even when a plurality of images are photographed by one photographing. Further, since the image is recorded as digital image data and can be easily deleted, unnecessary image data of the image can be deleted, and the photographing cost can be reduced.

(Second Embodiment) FIG. 5 shows a second embodiment of the present invention.
Shown in The digital camera 100 according to the second embodiment mainly includes a control unit 102, a lens unit 103, a lens moving unit 104, a CCD 105, and an A, similarly to the digital camera according to the first embodiment.
/ D converter 106, RAM 107, LCD 109, VR
AM 110, flash memory 111, interface 112, shutter button 113, and input unit 11
4 is provided.

The digital camera 100 of the second embodiment is different from the first embodiment in that the digital camera 100 is not provided with the image forming section 8. The functions of the other components are the same as in the first embodiment, and a description thereof will be omitted.

In the digital camera 100 of the second embodiment, depth of field data based on a depth of field table as shown in FIG. 6 is recorded in the recording area of the flash memory 111. This depth-of-field data is determined by the characteristics of the lens constituting the lens unit 103. Therefore, depth-of-field data corresponding to the lens constituting the lens unit 103 is recorded.

Hereinafter, the digital camera 1 according to the second embodiment will be described.
The operation of 00 will be described. (1) When a power switch (not shown) of the digital camera 100 is set to “ON” and a mode switch (not shown) is set to “View” mode, the power of each unit of the digital camera 100 is turned on. Then, the light from the subject received by the CCD 105 every several seconds to several tens of minutes is
The moving image is displayed on the LCD 109 as a moving image.

(2) The user presses the shutter button 113
Is set to "half shutter", the shutter speed and aperture value of the digital camera 100 are automatically calculated and set according to the brightness of the subject. The calculation of the shutter speed and the aperture value is performed by the control unit 102.

(3) The control unit 102 reads out the depth of field data corresponding to the set aperture value from the depth of field data recorded in the flash memory 111 as recording means. The control unit 102 calculates and sets a focusing distance from the read depth-of-field data. For example, when the set aperture value is F = 5.6, 0.5 m, 0.6 m, 0.7 m, and 0.8 m are obtained from the depth of field table shown in FIG.
m, 0.9m, 1.0m, 1.2m, 1.5m, 2m,
The focus is set at a distance of 3 m, 5 m, 10 m, and ∞.

If close-up photographing less than 1.0 m is not performed in normal photographing, it is possible not to focus on a distance less than 1.0 m. Further, when the set aperture value is F = 16, F is obtained from the depth of field table shown in FIG.
It is also possible to focus on all distances as in the case of = 5.6. However, as the aperture value becomes smaller, the depth of field at a distant place becomes deeper. Therefore, when focusing on a distance of 5 m, the object is focused on infinity.
Therefore, by focusing on a distance of 5 m, 1
Focusing on distances of 0 m and ∞ is not required. Therefore, when F = 16, the control unit 102
0.6m, 0.7m, 0.8m, 0.9m, 1.0m,
It is set to focus on distances of 1.2 m, 1.5 m, 2 m, 3 m, and 5 m.

(4) Shutter button 1 by user
When the shutter 13 is set to “full shutter”, the lens unit 103 is moved to the lens moving unit 1 so that the lens unit 103 is focused on the set distance.
04. (5) Each time the lens unit 103 is moved to a position where the lens unit 103 is focused on a predetermined distance by the lens moving unit 104, shooting is performed according to an instruction from the control unit 102. For example,
When F = 5.6, 0.5m, 0.6m, 0.7m,
0.8m, 0.9m, 1.0m, 1.2m, 1.5m,
Photographing is performed at a distance of 2 m, 3 m, 5 m, 10 m, ∞. The execution of photographing is the same as in the first embodiment, and a description thereof will be omitted.

(6) The photographed images are displayed on the LCD 109 after photographing is completed. The user can use the LCD 109
Looking at the image displayed in (1), the image selecting means selects the image focused on the desired subject. The image selection means and the subsequent processing are the same as in the first embodiment, and a description thereof will be omitted.

As described above, in the second embodiment, as in the first embodiment, an image can be taken while a plurality of subjects at different distances from the digital camera 100 are in focus. In the second embodiment, the depth of field data is recorded in the flash memory 111, so that the lens unit 10 is set at a distance set in advance according to the aperture value at the time of shooting.
Focus on 3. Then, each time the focus of the lens unit 103 is set at a predetermined distance, the subject is photographed. Therefore, since a complicated distance measuring means or the like is not required, the structure of the digital camera 100 is simplified, and the manufacturing cost can be reduced. In addition, since complicated calculations by distance measurement are not required, a plurality of images can be shot more quickly.

[Brief description of the drawings]

FIG. 1 is a schematic diagram illustrating an image created by an image creating unit of a digital camera according to a first embodiment of the present invention.

FIG. 2 is a block diagram illustrating a digital camera according to a first embodiment of the present invention.

FIG. 3 is a diagram illustrating values of an evaluation function of a subject with respect to the number of steps of a stepping motor for each ranging area.

FIG. 4 is an explanatory diagram illustrating a positional relationship between the digital camera and a subject according to the first embodiment of the present invention.

FIG. 5 is a block diagram showing a digital camera according to a second embodiment of the present invention.

FIG. 6 is a diagram illustrating an example of a depth of field table used in a digital camera according to a second embodiment of the present invention.

FIG. 7 is a schematic diagram showing a distance measurement area of a conventional autofocus function.

[Explanation of symbols]

 1, 100 Digital camera 2 Control unit 3, 103 Lens unit 4 Lens moving unit 5, 105 CCD (imaging unit) 6, 106 A / D converter (imaging unit) 7, 107 RAM (storage unit) 8 Image creating unit 14 , 114 Input unit (image selecting means) 20 Image 21 Distance measuring area 30 Subject 102 Control unit 104 Lens moving means

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) G03B 19/02 G02B 7/11 N // H04N 101: 00 G03B 3/00 A F term (reference) 2H002 CC00 DB02 FB35 GA05 GA19 GA23 GA54 JA07 ZA02 2H011 AA03 BA31 BB04 CA21 DA01 2H051 AA00 BA47 CE14 DA03 DA10 DA19 DA22 DD09 EB06 GB12 2H054 AA01 BB08 5C022 AA13 AB12 AB29 AB30 AB51 AC00 AC03

Claims (4)

[Claims] 1. A lens that condenses light from a subject, an imaging unit that receives the light condensed by the lens and converts the light from the subject into image data, and stores the image data. A focusing unit that focuses the lens at a plurality of distances; and a photographing unit that transmits the image data from the imaging unit to the storage unit every time the lens is focused. Digital camera that features. 2. An image selecting unit which can select desired image data from a plurality of image data stored in the storage unit, and an erasing unit which can delete other than the selected image data from the storage unit. The digital camera according to claim 1, further comprising: 3. The focus adjusting means includes: a distance measuring means for measuring a distance to each of a plurality of objects having different distances from the lens; and each of the objects based on the distance to the object measured by the distance measuring means. And a lens moving means for focusing the lens.
Or the digital camera according to 2. 4. The focus adjustment means includes: storage means for storing a depth-of-field table of the lens; exposure calculation means for calculating an aperture value and a shutter speed from the brightness of the subject; Reading means for reading a depth-of-field table corresponding to the distance from the recording means; distance calculating means for calculating a photographable distance from the read depth-of-field of the depth-of-field table; 3. The digital camera according to claim 1, further comprising a lens moving unit that focuses the lens at a possible distance.