JP2003319231A - Digital camera - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a digital camera which prevents a boundary part from being unnatural even though a telephotographed image is combined to the central part of an image photographed at a wide angle and obtains images of various photographic magnifications with a simple configuration. <P>SOLUTION: This digital camera is provided with a first photographing system of a wide angle system and a second photographing system of a telephotographing system, generates a reduction image 66 reduced to a photographing magnification being the same as that of a photographic image 62A photographed by the first photographing system from a photographic image 62B photographed by the second photographing system and composes the reduction image with the photographic image 62A photographed by the first photographing system. At this time, correction data for correcting an image of a peripheral region 68 is generated on the basis of image data of the peripheral region 68 of the reduction image 66 and image data of the peripheral region of the photographic image 62A to define the correction data as the image data for the peripheral region 68. The correction data is determined so as to maintain the continuity of image data around the peripheral region. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital camera, and more particularly to a digital camera having a plurality of photographing systems.

[0002]

2. Description of the Related Art In recent years, many digital cameras equipped with an image pickup device such as a CCD have been distributed. In such a digital camera, a subject image is formed on the light receiving surface of the CCD at the time of shooting, and converted into signal charges of an amount corresponding to the amount of incident light by each sensor of the CCD. Then, the signal charge accumulated in the CCD is read for each pixel and converted into image data, and this image data is recorded in a recording medium such as a memory card.

A digital camera having a plurality of image pickup devices has also been proposed. For example, JP 2001-1
Japanese Patent No. 03466 discloses a technique capable of improving the image quality of the central part of an image by combining the image of the telephoto image with the central part of the wide-angle image.

[0004]

However, in the above-mentioned prior art, there is a problem in that the boundary between the wide-angle shot image and the telephoto shot image becomes unnatural and the image quality deteriorates.

Further, in order to obtain images of various photographing magnifications, a high-magnification zoom lens is used, or a photographed image is digitally processed to be enlarged to realize a photographing magnification which cannot be covered by optical zoom. It is necessary to have a zoom function.

However, when a high-magnification zoom lens is used, there is a problem that a space required for an actuator or the like is required and control is complicated, and in the case of electronic zoom, image quality becomes excessive when excessive electronic zoom is performed. There was a problem that was deteriorated.

The present invention has been made to solve the above problems, and prevents the boundary portion from being unnatural even if a telephoto image is combined with the central portion of a wide-angle image. In addition to the above, it is an object of the present invention to provide a digital camera capable of obtaining images with various photographing magnifications with a simple configuration.

[0008]

In order to achieve the above object, the invention according to claim 1 forms a first image pickup device for picking up an image of a subject, and an image of the subject is formed on the first image pickup device. A first image pickup system including a first lens, a second image pickup device for picking up the image of the subject, and a second image pickup device having a focal length longer than that of the first lens. A second imaging system including a second lens that forms an image, and a second captured image captured by the second image sensor, and a first captured image by the first image sensor. Reduction means for reducing to an image having a view angle substantially the same as that of the captured image, image data of a predetermined peripheral area of the image reduced by the reduction means, and image data corresponding to the peripheral area of the first captured image Based on, the continuity of the image data in the peripheral area is corrected Characterized by comprising a synthesizing means for synthesizing the reduced image by the reduction unit and the first captured image.

According to the present invention, two image pickup systems are provided, and each image pickup system includes an image pickup device and a lens for forming an image of a subject on the image pickup device. Then, for example, the second lens can use a telephoto lens longer than the focal length of the first lens, and the first lens can use a wide-angle lens. That is, it is possible to obtain picked-up images having different shooting angles of view by the two shooting systems. The first image sensor and the second image sensor are composed of, for example, CCDs having substantially the same number of pixels.

The reduction means reduces the second captured image captured by the second image sensor to an image having an angle of view substantially the same as that of the first captured image captured by the first image sensor. That is, an image corresponding to the central portion of the first captured image is generated from the second captured image.

The synthesizing means synthesizes the first photographed image and the image reduced by the reducing means. At this time, since the image reduced by the reducing means is generated from the image captured by the second telephoto system, the information amount is the information amount of the image in the central portion of the first captured image. More than. Therefore, the image quality of the central portion of the image can be improved.

Further, due to the composition, the boundary portion between the first photographed image and the image reduced by the reducing means becomes discontinuous, which may deteriorate the image quality. Therefore, the synthesizing means
When combining, the continuity of the image data of the peripheral area is corrected based on the image data of the predetermined peripheral area of the image reduced by the reducing means and the image data corresponding to the peripheral area of the first captured image. To do. As a result, it is possible to prevent the image at the boundary from becoming unnatural.

As described in claim 2, the synthesizing means includes image data of a predetermined peripheral area of the image reduced by the reducing means and an image corresponding to the peripheral area of the first captured image. A correction data generation unit that generates correction data for correcting the continuity of the image data of the peripheral area based on the data, and the first captured image and the image reduced by the reduction unit are combined. With
A replacement unit that replaces the image data of the peripheral region with the correction data can be configured.

Further, as described in claim 3, a setting means for setting a photographing angle of view, and a captured image of the subject imaged by the first image sensor are enlarged to the image of the photographing field angle. And a reduction unit that reduces the captured image captured by the second image sensor to an image having the shooting angle of view, and the correction data generating unit has an image having the shooting angle of view. Based on the image data of the predetermined peripheral area of the reduced image reduced to and the image data corresponding to the peripheral area of the enlarged image enlarged to the image of the shooting angle of view, the image data of the peripheral area is continuous. Correction data for correcting the property, and the replacement means,
The enlarged image and the reduced image may be combined and the image data of the peripheral area may be replaced with the correction data. As a result, it is possible to obtain an image with an arbitrary photographing field angle set by the setting means.

At least one of the first lens and the second lens may be a zoom lens. This makes it possible to obtain the same effect as high-power zoom.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION (First Embodiment) An example of the first embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows a block diagram of a digital camera according to an embodiment of the present invention. This digital camera 10
Are two independent shooting systems (first shooting system 12
A and a second photographing system 12B), and CCDs 18A and 18B through photographing optical systems 14A and 14B, respectively.
A subject image is formed on the light receiving surface of the.

The first photographing system 12A is used for acquiring a photographed image, and the second photographing system 12B is used for focus adjustment (for AF control).

The photographing optical system 14A comprises a first lens group 19A including a photographing lens 15A and a focus lens 16A.
Similarly, the taking optical system 14B is configured to include a second lens group 19B including a taking lens 15B and a focus lens 16B and an aperture 17B.

The lens group 19A includes, for example, FIG.
As shown in (B), the angle of view α is wider than the angle of view β of the lens group 19B (short focal length) is a wide-angle system single focus lens. The lens group 19B is a telephoto single-focus lens whose angle of view β is narrower (longer focal length) than the angle of view α of the lens group 19A. The lens group 19
A and 19B may be configured by zoom lenses (focal length variable lenses). Further, either of the lens groups 19A and 19B may be composed of a single focus lens.

The CCD 18A and the CCD 18B are, for example, CCDs of the same size, that is, the same number of pixels. Therefore, the image photographed by the first photographing system 12A is
If the captured image 62A as shown in FIG.
The image captured by the second image capturing system 12B is a captured image 62B in which the central portion of FIG. 3A is enlarged, as shown in FIG. 3B.

The CCD 18A corresponds to the first image sensor of the present invention, the CCD 18B corresponds to the second image sensor of the present invention, and the first lens group 19A corresponds to the first lens of the present invention. The second lens group 19B corresponds to the second lens of the present invention.

The subject images formed on the light receiving surfaces of the CCDs 18A and 18B via the respective photographing optical systems 14A and 14B are converted into signal charges by the respective sensors according to the incident light amount. The signal charges accumulated in this way are read by CCD driving pulses applied from the CCD driving circuits 20A and 20B, and are sequentially output from the CCDs 18A and 18B as voltage signals (analog image signals) corresponding to the signal charges.

Each of the CCDs 18A and 18B is provided with a shutter drain via a shutter gate. By driving the shutter gate with a shutter gate pulse, accumulated signal charges can be swept out to the shutter drain. That is, the CCD 18
It has a so-called electronic shutter function that controls the accumulation time (shutter speed) of the charge accumulated in each sensor by the shutter gate pulse.

The signals read from the CCDs 18A and 18B are subjected to correlated double sampling (CDS) processing in the CDS circuits 22A and 22B, and R,
Color separation processing is performed on each of the G and B color signals, and the signal level of each color signal is adjusted (for example, pre-white balance processing).

The image signal subjected to the predetermined analog signal processing is added to A / D converters 24A and 24B, and the A
After being converted into R, G, B digital signals by the / D converters 24A, 24B, they are stored in the memories 26A, 26B. The memories 26A and 26B may be one memory, or may be separate memories for each imaging system.
The memories 26A and 26B also store various data other than image data.

The timing signal generation circuit (TG) 28 is
CCD drive circuit 20 in response to a command from CPU 30
A, 20B, CDS circuits 22A, 22B, and A / D converters 24A, 24B are provided with appropriate timing signals, and each circuit is driven in synchronization with a timing signal added from a timing signal generation circuit 28. It has become so.

The CPU 30 is a control unit for integrally controlling each circuit of the digital camera 10, and includes a gain adjusting circuit 34, a gamma correction circuit 36, a luminance / color difference signal processing circuit (referred to as YC processing circuit) 38 via a bus 32. Compression / expansion circuit 4
0, card interface 44 of the memory card 42,
And a display driver 48 for driving the display unit 46 and the like.

The CPU 30 controls corresponding circuit blocks based on an input signal from the operation unit 50, controls zooming operations of the photographing lenses 15A and 15B and automatic focus adjustment (AF) operations by the focus lenses 16A and 16B, and Controls automatic exposure adjustment (AE).

The operation section 50 includes a release button for giving an instruction to start recording an image, a mode selection means for the camera, a zoom operation means, and various other input means. These input means have various forms such as switch buttons, dials, and sliding knobs, and there is a mode in which a setting menu or selection items are displayed on the screen of a touch panel or a liquid crystal monitor display unit and a desired item is selected with a cursor. . The operation unit 50 may be provided in the camera body, or may be configured as a remote control transmitter separated from the camera body.

The CPU 30 performs various calculations such as focus evaluation calculation and AE calculation based on the image signals output from the CCDs 18A and 18B, and based on the calculations, the photographing lenses 15A and 15B and the focus lenses 16A and 16B.
B, and drive circuits 52A and 52B for the diaphragms 17A and 17B
To control. That is, when the lens groups 19A and 19B are composed of zoom lenses, the photographing lenses 15A and 15B are zoomed by driving the motors 54A and 54B to change the photographing magnification. In the case of manual zooming or a single focus lens, the motor 5
4A and 54B can be omitted.

By driving the motors 56A and 56B, the focus lenses 16A and 16B are moved to the in-focus position, and the diaphragms 17A and 17B are set to proper diaphragm values. The motors 56A and 56B are stepping motors, and the focus lens position is controlled by controlling the number of steps. The motor 56A,
56B is not limited to a stepping motor, but a DC motor or the like may be used, for example. Note that the motors 54A and 54B are also stepping motors and DCs.
A motor or the like can be used.

The AF control employs a contrast AF method in which the focus lenses 16A and 16B are moved so that the high frequency component of the G signal becomes maximum. That is, the focus lenses 16A and 16B are moved by driving the motors 56A and 56B via the drive circuits 52A and 52B, and the focus lenses 16A and 16B are positioned at the position where the contrast value is maximum.

In the AE control, the subject brightness (photographing EV value) is obtained based on the integrated value obtained by integrating the R, G, B signals of one frame by the integrating circuits 60A, 60B, and the aperture value is calculated based on this photographing EV value. The shutter speed is determined, the diaphragms 17A and 17B are driven through the drive circuits 52A and 52B, and the charge accumulation time of the CCDs 18A and 18B is controlled by the electronic shutter so that the determined shutter speed is achieved. Therefore, only by directing the taking lenses 15A and 15B of the digital camera 10 to the subject, the optimum exposure adjustment is performed and the focusing is automatically performed.

At the time of shooting and recording, the above-mentioned AF operation is performed when the release button is "half-pressed", and an accurate shooting EV is obtained by repeating the photometric operation a plurality of times, and the aperture value at the time of shooting is obtained based on this shooting EV. And finally the shutter speed is decided. Then, press the release button "fully."
Sometimes, the aperture value is adjusted so that the aperture value finally determined is the same as the aperture value 17
A and 17B are driven, and the charge accumulation time is controlled by the electronic shutter so that the shutter speed becomes the determined shutter speed. Note that the AE control may be performed using a known photometric sensor or the like in addition to the method of controlling based on the image signals acquired from the CCDs 18A and 18B.

Further, the digital camera 10 has a strobe light emitting device 55 and a light receiving element 57 for light control, and in response to the operation of a strobe mode setting button included in the operation unit 50, the strobe light emitting device 55 at low brightness. Set to "low-brightness automatic flash mode" that automatically flashes, "forced flash mode" that flashes the flash 55 regardless of subject brightness, or "flash off mode" that disables flashing of the flash 55 To be done.

The CPU 30 controls the charging of the main capacitor of the strobe light emitting device 55 and the discharge (light emission) timing to the light emitting tube (for example, a xenon tube) according to the strobe mode selected by the user, and the light receiving element. 5
The light emission stop control is performed based on the measurement result from 7. The light receiving element 57 receives the reflected light from the subject illuminated by the strobe light and converts it into an electric signal according to the amount of received light. The signal of the light receiving element 57 is integrated by an integrating circuit (not shown), and when the integrated amount of received light reaches a predetermined appropriate amount of received light, the strobe light emitting device 55 stops emitting light.

The data output from the A / D converters 24A and 24B are stored in the memories 26A and 26B and added to the integrating circuits 60A and 60B. Integrating circuit 6
0A and 60B include a plurality of blocks (for example,
(8 × 8 64 blocks), and the G signal received for each block is integrated. It should be noted that a luminance signal (Y signal) may be generated from the R, G, and B data and integrated calculation of the luminance signal may be performed. In addition, the integrating circuits 60A and 60
B can also be used as an AF arithmetic circuit or an AE arithmetic circuit. Information (calculation result) of the integrated value obtained by the integrating circuits 60A and 60B is input to the CPU 60.

The CPU 30 calculates the evaluation value E of the photographing screen based on the information received from the integrating circuits 60A and 60B,
The obtained evaluation value E is used to determine the gain value (amplification factor) in the gain adjustment circuit 34. The CPU 30 controls the gain amount in the gain adjusting circuit 34 according to the determined gain value.

R stored in the memories 26A and 26B,
The G and B image data are sent to the gain adjusting circuit 34, and are amplified there. The image data subjected to the amplification processing is subjected to gamma correction processing in the gamma correction circuit 36 and then sent to the YC processing circuit 38, where it is converted from RGB data into a luminance signal (Y signal) and a color difference signal (Cr, Cb signal). To be converted.

The luminance / color difference signal (abbreviated as YC signal) generated in the YC processing circuit 38 is stored in the memory 26A,
It is written back to 26B. The YC signal stored in the memories 26A and 26B is supplied to the display driver 48, converted into a predetermined system signal (for example, NTSC system color composite video signal), and output to the display unit 46. Display unit 46
A liquid crystal display or other display device capable of color display is used as the display device. The display unit 46 may be of a type compatible with YC signal input or may be of a type compatible with RGB signal input, and a driver compatible with a display device may be applied.

Image data is periodically rewritten by image signals output from the CCDs 18A and 18B, and a video signal generated from the image data is supplied to the display unit 46, so that images captured by the CCDs 18A and 18B are real-time. Is displayed on the display unit 46 as a moving image (live image) or as a substantially continuous image although not in real time.

The display section 46 can be used as an electronic viewfinder, and the photographer can confirm the photographing field angle by the display image of the display section 46 or the electronic viewfinder (not shown). In response to a predetermined recording instruction (imaging start instruction) operation such as a release button pressing operation, the acquisition of the recording image data is started.

When the photographer inputs a photographing / recording instruction from the operation unit 50, the CPU 30 causes the compression / expansion circuit 4 to operate as necessary.
A command is sent to 0, whereby the compression / expansion circuit 40 compresses the YC data on the memories 26A and 26B in accordance with a predetermined format such as JPEG. The compressed image data is transferred to the memory card 42 via the card interface 44.
Recorded in.

When the mode for recording non-compressed image data (non-compression mode) is selected, the compression processing by the compression / expansion circuit 40 is not performed, and the image data remains uncompressed in the memory card 42. Recorded in.

Digital camera 10 according to the present embodiment
Is a memory card 42 as a means for storing image data.
Is used. Specifically, for example, a recording medium such as smart media is applied. The form of the recording medium is not limited to the above, but may be a PC card, a micro drive, a multimedia card (MMC), a magnetic disk,
Various forms such as an optical disc, a magneto-optical disc, and a memory stick are possible, and a signal processing means and an interface according to the medium used are applied.

In the reproduction mode, the memory card 42
The image data read from the display unit 4 is expanded by the compression / expansion circuit 40, and is displayed on the display unit 4 via the display driver 48.
6 is output.

Next, the synthesizing process of photographed images photographed by the two photographing systems will be described. In the present embodiment, the first
By combining the photographed image 62A photographed by the photographing system 12A and the photographed image 62B photographed by the second photographing system 12B, an image in which the image quality of the central portion of the photographed image is improved is generated.

For example, in the case where the zoom operation means has instructed the shooting at the widest angle, that is, the shooting at the view angle α, the second shooting is performed as shown in FIGS. A reduced image 66 is generated by reducing the captured image 62B captured by the system 12B to the same capturing magnification (capturing angle of view) as that of the captured image 62A captured by the first capturing system 12B.
It is combined with the photographed image 62A photographed by the photographing system 12A. That is, the captured image 62A corresponding to the reduced image 66
By replacing the image in the center of the image with the reduced image 66, both images are combined. This makes it possible to obtain an image in which the image quality of the central portion of the image is improved.

However, if the central image of the photographed image 62A is simply replaced by the reduced image 66, the boundary between the two becomes unnatural, and the image quality may deteriorate.

Therefore, in the present embodiment, as shown in FIG. 4A, the image data of the peripheral area 68 (area indicated by diagonal lines) of the reduced image 66 and the peripheral area 68 of the photographed image 62A.
The correction data for correcting the image of the peripheral region 68 is generated based on the image data of No. Then, this correction data is used as the image data of the peripheral area 68. This allows
It is possible to prevent unnaturalness from occurring at the boundary between the captured image 62A and the reduced image 66, and to prevent deterioration in image quality.

Next, the process of generating the correction data for the peripheral area 68 will be described.

FIG. 5 shows an example of the image data 70 of the specific color (for example, R) between A and B shown in FIG. 4A and the image data 72 of the reduced image 66 of the image data forming the photographed image 62A. showed that.

In the generation of the correction data, the position X ₁ indicating the position of the outer edge of the peripheral region 68 to the position X _n indicating the position of the inner edge of the peripheral region 68 is divided into n (n = 1, 2,
3, ...). Then, the correction data D _{1 to} D _n corresponding to the n-divided positions X _{1 to} X _n are obtained.

First, as the correction data D _{1 at the} position X ₁ indicating the position of the outer edge of the peripheral area 68, as shown in FIG. 5, the image data of the image data 70 forming the photographed image 62A is used as it is, Position X _n indicating the position of the inner edge of 68
The correction data D _n of the reduced image 66
The image data of the image data 72 constituting the above is used as it is. Then, the correction data D _{2 to} D at the positions X _{2 to} X _{n-1
Calculate n-1} according to the following formula.

D _i = D ₁ − {(X _i −X ₁ ) / L} × H ...
(1) Here, i = 2, 3, ... N-1. Also, L
Is the width of the peripheral region 68 and can be represented by X _n −X ₁ . H is the difference between the correction data D ₁ and the correction data D _n .

That is, from the position X ₁ which is the left end of the peripheral area 68 to the position X _n which is the right end of the peripheral area 68, the correction data D ₁ to D _n is determined. As a result, the correction data of the peripheral area 68 is represented by the correction curve as shown by the alternate long and short dash line in FIG. It is possible to prevent the boundary part between and from becoming unnatural.

As shown in FIG. 6, the above processing is performed for all the image data 70 and 72 of the peripheral area 68 on the radiation 76 centered on the center position 74 of the captured image 62A, whereby the peripheral area is obtained. Correction data is generated for all 68.

Then, by carrying out these processes for all the R, G, B images, the generation of the correction data is completed.

The generation of the correction data is not limited to the above method, and any method may be adopted as long as the image data between A and B is substantially continuous.

In the case of generating an image of intermediate magnification, that is, an image of intermediate magnification between the photographing magnification of the photographed image 62A and the photographing magnification of the photographed image 62B, an enlarged image obtained by enlarging the photographed image 62A to the intermediate magnification. Is generated, a reduced image obtained by reducing the captured image 62B to an intermediate magnification is generated, and the reduced image may be combined by the above method. As a result, it is possible to obtain an intermediate-magnification image steplessly without using a zoom lens.

Next, as an operation of this embodiment, the CPU
The control routine executed in 30 will be described with reference to the flowchart in FIG.

In step 100, it is determined whether or not the release button has been fully pressed. If the release button has not been pressed, the determination in step 100 is denied, and the process waits until the release button is pressed.

On the other hand, if the release button is pressed, the determination in step 100 is affirmative, and step 102
Then, the imaging process is performed in each of the first imaging system 12A and the second imaging system 12B as described above. As a result, the captured image 62A is stored in the memory 26A and the captured image 62B is stored in the memory 26B.

In the next step 104, the first photographing system 1
The captured image 62A captured in 2A is enlarged to the designated magnification. This magnification is determined according to the zoom operation amount of the zoom operation means. The process of step 104 is
The zoom operation means corresponds to the enlargement means of the present invention, and the zoom operation means corresponds to the setting means of the present invention.

Then, in the next step 106, the photographed image 62B photographed by the second photographing system 12B is reduced to the designated magnification. The processing of step 106 corresponds to the reducing means of the present invention.

Next, in step 108, the correction data of the peripheral area 68 is generated as described above. That is, the image data of the peripheral area of the reduced image obtained by reducing the captured image 62B captured by the second capturing system 12B and the captured image 62A captured by the first capturing system 12A are enlarged to a specified magnification. The correction data of the peripheral area is generated based on the image data of the peripheral area of the image data of the image. This correction data is the first part which is the peripheral part of the image.
Magnified image of the photographic image 62A taken by the second photographic system 12B and the photographic image 6 taken by the second photographic system 12B
The image data at the boundary with the reduced image obtained by reducing 2B is determined to be substantially continuous. This can prevent the boundary portion between the enlarged image and the reduced image from becoming unnatural. The processing of step 108 corresponds to the correction data generating means of the present invention.

Then, in the next step 110, image synthesizing processing is performed. That is, the enlarged image obtained by enlarging the photographed image 62A photographed by the first photographing system 12A is
The reduced image obtained by reducing the captured image 62B captured by the image capturing system 12B is combined, and the peripheral area of the reduced image is replaced with the correction data generated in step 108. As a result, the image data of the peripheral portion of the composite image is stored in the first imaging system 1
It becomes image data of an enlarged image obtained by enlarging the taken image 62A taken by 2A, and the image data of the central portion of the composite image becomes image data of a reduced image obtained by reducing the taken image 62B taken by the second taking system 12B. The boundary portion between the enlarged image and the reduced image is the generated correction data. The processing of step 110 corresponds to the synthesizing means of the present invention.

As described above, according to the present embodiment, a photographic image photographed by the wide-angle photographic system and a photographic image photographed by the telephoto photographic system are combined, and the image data of the boundary portion between the two is Replace the image data of the image shot with the wide-angle shooting system with the correction data that gradually approaches the image data of the image shot with the telephoto shooting system, and the image data near the boundary is almost continuous. Synthesize so as to maintain sex. As a result, the image quality of the central portion of the image can be improved and the image of the boundary portion can be prevented from becoming unnatural.

Further, the zoom lens can be used by synthesizing a magnified image obtained by enlarging a photographed image taken by the wide-angle taking system and a reduced image obtained by reducing the taken image taken by the telephoto taking system. Without it, it is possible to obtain an intermediate magnification image steplessly. As a result, images with various magnifications can be obtained with a simple device configuration.

It should be noted that, in the present embodiment, a case has been described in which a monofocal lens is used in any photographing system, but the present invention is not limited to this, and at least one may be a zoom lens.
For example, the first lens group 19A may be a super wide-angle single focus lens, and the second lens group 19B may be a wide-angle to telephoto low-magnification zoom lens. Further, the first lens group 19A may be a super-telephoto single-focus lens, and the second lens group 19B may be a wide-angle to telephoto low-magnification zoom lens. In this way, by combining one single-focus lens and one zoom lens, it is possible to obtain the same effect as a high-magnification zoom lens.

[0072]

As described above, according to the present invention, it is possible to prevent the boundary portion from becoming unnatural even if the telephoto shot image is combined with the central portion of the wide-angle shot image. There is an effect that images of various photographing magnifications can be obtained with a simple configuration.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of a digital camera.

2A is a schematic configuration diagram of a first imaging system according to the first embodiment, and FIG. 2B is a schematic configuration diagram of a second imaging system according to the first embodiment.

FIG. 3A is an image diagram of an image taken by the first imaging system according to the first embodiment, and FIG. 3B is an image taken by the second imaging system according to the first embodiment. FIG.

FIG. 4A is an image diagram of an image taken by a first imaging system according to the first embodiment, and FIG. 4B is an image taken by a second imaging system according to the first embodiment. FIG.

FIG. 5 is a diagram showing a relationship between image data and a position in a boundary portion of an image.

FIG. 6 is an image diagram for explaining generation of correction data.

FIG. 7 is a flowchart of a control routine executed by a CPU.

[Explanation of symbols]

10 digital camera 12A, 12B shooting system 14A, 14B Photographic optical system 15A, 15B shooting lens 16A, 16B focus lens 20A, 20B CCD drive circuit 22A, 22B CDS circuit 24A, 24B A / D converter 26A, 26B memory 28 Timing signal generation circuit 32 buses 34 Gain adjustment circuit 36 Gamma correction circuit 38 Processing circuit 40 compression / expansion circuit 42 memory card 44 card interface 46 Display 48 display driver 50 Operation part 52A, 52B drive circuit 54A, 54B motor 55 Strobe light emitting device 56A, 56B motor 57 Light receiving element 60A, 60B integrating circuit

Claims (3)

[Claims] 1. A first imaging system including a first imaging device for imaging a subject and a first lens for forming an image of the subject on the first imaging device; and an imaging for the subject. And a second lens having a focal length longer than that of the first lens and forming an image of the subject on the second image sensor. Reducing means for reducing the second captured image captured by the second image sensor to an image having a field angle substantially the same as that of the first captured image captured by the first image sensor; The continuity of the image data of the peripheral area is corrected based on the image data of the predetermined peripheral area of the image reduced by and the image data corresponding to the peripheral area of the first captured image, and Combining the first captured image and the image reduced by the reducing means A digital camera equipped with a synthesizing means for. 2. The synthesizing means, based on image data of a predetermined peripheral area of the image reduced by the reducing means, and image data corresponding to the peripheral area of the first captured image, A correction data generation unit that generates correction data for correcting the continuity of the image data of the region, the first captured image and the image reduced by the reduction unit are combined, and the image data of the peripheral region is combined. 2. The digital camera according to claim 1, further comprising: a replacement unit that replaces the correction data with the correction data. 3. A setting means for setting a photographing angle of view, and an enlarging means for enlarging a captured image of the subject captured by the first image sensor to an image of the photographing angle of view, The reduction unit reduces the captured image captured by the second image sensor to the image with the shooting angle of view, and the correction data generation unit determines in advance the reduced image reduced to the image with the shooting angle of view. Correction data for correcting the continuity of the image data of the peripheral area based on the image data of the peripheral area and the image data corresponding to the peripheral area of the enlarged image enlarged to the image of the shooting angle of view. 3. The digital camera according to claim 2, wherein the replacement unit combines the enlarged image and the reduced image and replaces the image data of the peripheral region with the correction data.