JP3399454B2 - Digital camera, image processing method, and recording medium recording image photographing program - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital camera for photographing a subject and recording image data, an image processing method, and a recording medium recording an image photographing program.

[0002]

2. Description of the Related Art Generally, a digital camera is provided with a liquid crystal display or the like for displaying an image, and by displaying an image on the liquid crystal display or the like, a subject obtained by photographing can be confirmed. it can. However, even in a digital camera, since image data cannot be read from the image sensor during exposure (during charge accumulation), the subject image being exposed cannot be displayed on the liquid crystal display or the like. On the other hand, in the case of a digital camera having an optical viewfinder, the subject can be confirmed through the optical viewfinder during exposure. However, even in this case, it is difficult to confirm the subject through the optical viewfinder when the subject is dark such as a night view.

[0003]

Conventionally, since it is not possible to confirm the subject being exposed, it is unclear what kind of image can be obtained until the shooting is completed, especially during long-time shooting such as bulb shooting. There was a problem that was.

Therefore, the present invention has been made in view of the above problems, and provides a digital camera capable of confirming a subject image during the exposure of the digital camera, and Another object of the present invention is to provide a simple image processing method and a recording medium in which an image capturing program for realizing the method is recorded.

[0005]

In order to achieve the above object, an invention according to claim 1 is a digital camera for photographing a subject and recording image data, comprising a pixel column of a first field and a pixel column of a first field. Image data obtained from the pixel array of the second field and an image pickup unit having a pixel array of two fields are recorded, and the image data obtained from the pixel array of the first field is exposed during the exposure of the pixel array of the second field. And a control unit that performs image display processing using the obtained image data.

According to a second aspect of the present invention, there is provided a digital camera for photographing a subject to generate image data.
An image pickup means having a pixel row of a field and a pixel row of a second field; and a control means for controlling the exposure time of the pixel row of the first field and the exposure time of the second field to be different from each other, The control means sets the exposure time of the pixel row of the first field shorter than the exposure time of the pixel row of the second field, and the image data obtained from the pixel row of the second field is stored in a predetermined recording means. It is characterized by recording.

According to a third aspect of the present invention, in the digital camera according to the second aspect, the control means is the first
It is characterized in that an image is displayed on a predetermined display means based on the image data obtained from the pixel array of the field.

According to a fourth aspect of the present invention, in the digital camera according to the third aspect, the control means is the second camera.
The exposure of the pixel row of the first field and the image display are repeatedly performed until the exposure of the pixel row of the field is completed, and when the repeated image display is performed, the exposure from the pixel row of the first field is performed. It is characterized in that a predetermined process is performed using the obtained image data and the previously displayed image data, and then the image data is displayed.

According to a fifth aspect of the present invention, in the digital camera according to the fourth aspect, the predetermined processing adds the image data obtained from the pixel row of the first field and the previously displayed image data. It is characterized in that it is a process.

The invention according to claim 6 is the invention according to claims 3 to 5.
In the digital camera according to any one of items 1 to 3, the control means performs gain adjustment on both image data obtained from the pixel row of the second field and image data obtained from the pixel row of the first field. It is characterized in that the gain for the image data obtained from the pixel row of the first field is set to be larger than the gain for the image data obtained from the pixel row of the second field.

According to a seventh aspect of the present invention, there is provided an image processing method for photographing an object using an image pickup means having a first field pixel row and a second field pixel row and recording image data. Exposing the pixel columns of the first field repeatedly until the exposure of the pixel columns of the second field is completed, and displaying an image based on image data sequentially obtained from the pixel columns of the first field; When the exposure of the pixel row of the second field is completed, an image is recorded based on the image data obtained from the pixel row of the second field.

According to an eighth aspect of the present invention, the digital camera is installed in a computer readable recording medium in a microcomputer incorporated in the digital camera, so that the digital camera can be stored in the digital camera. It is characterized in that it stores an image capturing program for functioning as.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will now be described in detail with reference to the drawings.

<1. Configuration and Operation of Digital Camera> FIGS. 1 and 2 are views showing the outer appearance of the digital camera 1 according to the present embodiment. FIG. 1 is a front view and FIG. 2 is a rear view. FIG. 3 is a block diagram showing the functional internal configuration of the digital camera 1.

The digital camera 1, as shown in FIG.
It is composed of a box-shaped camera body 2 and a rectangular parallelepiped image pickup unit 3. The image pickup unit 3 includes a zoom lens 11 with a macro function which is a photographing lens, and a CCD image pickup device 12 which is an interlace type CCD color area sensor having a predetermined size at a proper position behind the zoom lens 11 (see FIG. 3). ) Is provided. Further, the image pickup unit 3 includes an optical finder 6 for confirming a subject at the time of shooting.
Is provided.

As shown in FIG. 1, on the front surface of the camera body portion 2, a grip portion 4 is provided at the left end and a built-in flash 5 is provided at the upper center, and a shutter button 61 is provided on the top surface.

On the other hand, as shown in FIG.
A liquid crystal display unit (hereinafter, referred to as "LCD 51) is provided. A key switch group 62 for operating the digital camera 1 is provided below the LCD 51.

A quad switch 63 is provided on the right side of the rear surface of the camera. In the photographing mode, the zoom motor drive unit 33 drives the zoom lens 301 by pressing the left and right buttons to perform zooming. At the time of shooting, the AF motor driving unit 32 (see FIG. 3) is driven and the CCD lens 12 is driven by the zoom lens 11.
A subject image is formed on.

A shutter button 61 and a key switch group 62
The quad switch 63 is provided on the operation unit 6 operated by the user.
0 (see FIG. 3).

A card loading chamber 72 (see FIG. 3) is provided on the bottom side of the camera body 2, and a memory card 8 serving as recording means for recording an image and a setup program for the digital camera 1 are provided. A setup card 9 which is a recording medium in which the above items are stored can be attached and detached.

Next, the internal structure of the image pickup unit 3 will be described in order with reference to FIG.

CCD image pickup device 1 by zoom lens 11
The optical image of the object formed on the image pickup device 2 is photoelectrically converted by the CCD image pickup device 12, and image signals of R (red), G (green) and B (blue) color components (pixel signals received by each pixel are received. Output as a signal consisting of the signal train of).

FIG. 4 is a diagram showing an example of a pixel array in the CCD image pickup device 12. As shown in FIG. 4, the color components of each pixel of the CCD image pickup element 12 are arranged in a Bayer array, and a G component of 2 pixels, an R component of 1 pixel, and a B component of 1 pixel are arranged in a neighboring 4 pixel region 12a. Contains ingredients. Therefore, it is possible to reproduce a color image of a subject with two horizontal lines.

Further, the image pickup surface of the CCD image pickup device 12 is divided into a first field F1 and a second field F2 for every two horizontal lines, and the timing generator 31 reads out electric charges for each field, that is, Image readout is controlled. Of the two fields F1 and F2, the first field F1 is a display for outputting image data to be displayed on the LCD 51 by repeatedly performing exposure and reading during exposure of the second field F2 (during charge accumulation). The second field F2 is a recording field for outputting image data for recording by photographing.

The signal for each pixel output from the CCD image pickup device 12 is input to the signal processing circuit 13. The signal processing circuit 13 includes an auto gain control unit (hereinafter, “A
"GC". ) Various signal processing units including 13a are provided. The AGC 13a sets a gain value based on a gain setting command from the control CPU 20, and gives a gain to an output signal from the CCD image pickup device 12.

When the image data is acquired from the display field F1, the signal processing circuit 13 adds pixel data for four pixels included in each neighboring four pixel area 12a.
As a result, the color information is lost and the image data becomes a luminance image related to the subject luminance.

The image data output from the signal processing circuit 13 is given to the image processing unit 14, and various image processing is performed in the image processing unit 14. In addition, this image processing unit 1
Under the control of the control CPU 20, the image processing performed in 4 has different contents between the image data obtained from the display field F1 and the image data obtained from the recording field F2.

The image data subjected to the image processing in the image processing section 14 is stored in the image memory 15.

The control CPU 20 is composed of a microcomputer built in the digital camera 1,
A drive signal is given to the motor drive unit 32 and the zoom motor drive unit 33, and the timing generator 3
1 for display field F1 and recording field F
A command is given so that the exposure time differs between 2 and. Further, the control CPU 20 controls the processing operation in the signal processing circuit 13 and the image processing unit 14, accesses the image memory 15 to acquire the stored image data, and stores the image data in the VRAM 41 or the card. I / F7
The image data is recorded on the memory card 8 in the card loading chamber 72 via 1. The image data stored in the VRAM 41 is output to the LCD 51 and the image of the subject is displayed.

The photographing operation when the shutter button 61 is operated in the digital camera 1 having the above-mentioned structure will be described. FIG. 5 is a timing chart showing the relationship between the exposure (charge accumulation) when the shutter button 61 is operated, the output from the CCD image sensor 12, and the display image displayed on the LCD 51. Note that FIG. 5 illustrates a case of so-called bulb photography.

As shown in FIG. 5, when the shutter button 61 is operated and the shutter signal changes from the off state to the on state, the data is accumulated in the display field F1 and the recording field F2 of the CCD image pickup device 12 before that. The charges are output as image data X from the CCD image pickup device 12 and displayed as a display image X on the LCD 51. Then, when the charge output in each of the fields F1 and F2 is completed, both the display field F1 and the recording field F2 of the CCD image pickup device 12 are simultaneously exposed, that is, charge accumulation is started.

At this time, the accumulation time in the display field F1 is set to 1/10 sec, for example,
It is set so that charge accumulation is periodically repeated at / 10 sec. On the other hand, the accumulation time of the recording field F2 continues until the shutter signal is turned off.

Then, the charge of the image data P1 is accumulated in the display field F1 for the first 1/10 sec of accumulation time, and after the accumulation time of 1/10 sec is completed, from the display field F1 to the pixels for four pixels as described above. The image data P1 is output after adding the data, and the LCD 5
The display image G1 based on the image data P1 is displayed for 1.

Here, the LCD 51 is, for example, 1 / 30se.
Although an image of one frame can be displayed with c, the accumulation time is 1/10 sec, so that the same image is displayed on the LCD 51 three times in succession. Generally, it is assumed that the subject is dark when the shutter operation time is long, such as bulb photography, but in such a case 1/3
Since the image obtained by completing the charge accumulation in 0 sec becomes an extremely dark image, it is necessary to make the exposure time of the display field F1 longer than the displayable time of one frame. Therefore, in the present embodiment, the exposure of the display field F1 is continued while the display for three frames is performed.

When the first 1/10 sec accumulation time ends, the next 1/10 sec charge accumulation starts and the image data P2 charge accumulation starts. 1 / 10s
When the accumulation time of ec ends, the image data P2 is output from the display field F1 similarly to the image data P1, and the display image G2 is generated by performing image synthesis with the previously displayed image data G1 and is displayed on the LCD 51. Display image G
Display 2.

Thereafter, similarly, image display is repeated based on the image data obtained from the display field F1.
When an arbitrary natural number is n, the display image Gn when the exposure and reading of the display field F1 are repeated n times
Becomes Gn = P1 + P2 + ... + Pn = ΣPn. Therefore, the image displayed on the LCD 51 is an image in which the image data P1, P2, ... Obtained sequentially from the display field F1 are superimposed. By this superposition,
On the LCD 51 of the digital camera 1, the content of the image recorded in the recording field F2 is displayed while being updated. Therefore, there is an effect that the state during exposure can be updated and the image can be displayed in a state close to the recorded image.

Besides simple overlaying, there is also a method of averaging after overlaying or a method of comparing images P1, P2, ..., Pn and displaying only bright areas.

While the exposure and reading of the display field F1 are repeated, the recording field F2 is continuously exposed.

When the operation of the shutter button 61 is completed and the shutter signal is changed to the off state, the charge accumulation of the recording image data PM in the recording field F2 is completed and the CCD image pickup device 12 outputs it. And
The image data PM is recorded in the memory card 8 and displayed on the LCD 51 as a display image GM.
By performing this display, the image captured in the recording field F2 can be confirmed.

In the digital camera 1, the above-described operation may be performed by the control CPU 20 reading and executing the image photographing program recorded in the setup card.

<2. Processing Sequence> Next, the processing sequence of the digital camera 1 will be described. FIG. 6 is a flowchart showing a processing sequence in the digital camera 1 at the time of bulb photography.

First, the digital camera 1 performs live view display (step S10). The live view display is
When the shutter button 61 is not operated by the user, an image obtained from the display field F1 of the CCD image pickup device 12 is displayed on the LCD 51 every 1/30 sec or 1/10 sec to confirm the subject. It is a display.

Then, it is determined whether or not the shutter operation is performed (step S12). If the shutter operation is performed and the shutter signal is turned on, the process proceeds to step S14, and if the off state is maintained, The live view display (step S10) is continued.

When the shutter signal is turned on, the control CPU 20 sets the mode in which only the display field F1 in the CCD image pickup device 12 is read out (step S14). Then, the control CPU 20 uses the signal processing circuit 13
The gain of the AGC 13a is set to about 6 times the normal gain value (step S16). This makes it possible to raise the signal level of each pixel when a relatively dark subject is photographed in the display field F1 in a short time. Then, the read cycle of the display field F1 is set to 1/10 sec (step S18). As a result, during the exposure time of the recording field F2, it becomes possible to periodically repeat charge accumulation / charge output in the display field F1.

Then, when the first 1/10 sec has elapsed, the image data in the display field F1 is read (step S20).

Then, the read image data is subjected to image processing in the signal processing circuit 13 and the image processing section 14 (step S22). The image processing performed here is a gain adjustment processing by the AGC 13a, an image conversion processing for adding a signal value of 4 pixels included in each neighboring 4 pixel area 12a to convert a color image into a luminance image, L
This is thinning processing for matching the display resolution of the CD 51. In addition, gamma correction processing and the like are performed.

The image conversion processing is performed by adding the signal values of the four pixels included in the adjacent four pixel area 12a so as to eliminate the sensitivity decrease when photographing a relatively dark subject and increase the sensitivity. Is. In addition, since the photographing resolution of the CCD image pickup device 12 is generally smaller than the display resolution of the LCD 51, the thinning process causes the display field F to be reduced.
The image size obtained from 1 can be adapted to the display image size on the LCD 51.

FIG. 7 is a diagram showing a conversion process by image processing of image data obtained from the display field F1.
FIG. 7A shows the image pickup surface of the CCD image pickup device 12, and the image data PF1 is read from the display field F1 shown by the shaded area (FIG. 7B). This image data PF
1, the image size in the horizontal direction is the same as that of the CCD image sensor 12, but the image size in the vertical direction is 1.
It is 1/2 the size of 2. Therefore, the size ratio of the vertical direction and the horizontal direction is matched with the size ratio of the LCD 51, and the image data PF1 is thinned so as to match the display size of the LCD 51, and the image G used for display is displayed.
F1 is generated (FIG. 7 (c)). Note that when the image GF1 is generated, it is sufficient to perform thinning processing in the horizontal direction and the vertical direction to reduce the image, so that efficient image processing is possible.

Then, in step S24, the image GF1 obtained as described above and the display image previously displayed on the LCD 51 are added to generate a new display image. When this step S24 is performed for the first time, since the previously displayed image for display does not exist, the image GF1 obtained as a result of the above image processing is displayed as it is. On the other hand, when the process of step S24 is the second time or later, the image for display GF1 obtained by the above image processing is added to the image for display stored in the VRAM 41, and a new image for display is added. The image will be displayed.

Then, the control CPU 20 stores the newly generated display image in the VRAM 41 and causes the LCD 51 to display the display image (step S26).

Next, the control CPU 20 causes the shutter button 6
It is determined whether or not the operation No. 1 has been stopped (step S2
8) If the shutter signal is turned off, step S
If it is in the ON state, the process returns to step S20.

If the shutter signal remains on,
Since the exposure of the recording field F2 of the CCD image pickup device 12 is continued, the processes of steps S20 to S26 are repeated, and the LCD 5 using the images sequentially obtained from the display field F1 in the subsequent 1/10 sec cycle.
The display image in 1 is updated.

As a result, the subject image can be displayed on the LCD 51 by using the image of the display field F1 even while the shutter operation is continuously performed and the exposure of the recording field F2 is continued. Field F2
Even during the exposure, it is possible to visually confirm what kind of image is currently being captured by the image displayed on the LCD 51.

On the other hand, if the process proceeds to step S30,
The control CPU 20 stops the image reading mode from the display field F1 and sets the mode to read only the recording field F2 in the CCD image pickup device 12. Then, the control CPU 20 uses the AGC 13 a of the signal processing circuit 13.
, The gain is returned to the normal gain value (step S3
2).

While the shutter signal is on,
Image data composed of electric charges accumulated in the recording field F2 is read (step S34), and image processing is performed on the image data (step S36).

FIG. 8 is a diagram showing a conversion process by image processing of image data obtained from the recording field F2.
FIG. 8A shows the image pickup surface of the CCD image pickup device 12, and it shows the image data P from the recording field F2 shown as a solid color.
F2 is read (FIG. 8 (b)). This image data PF2
The image size in the horizontal direction is the same as that of the CCD image pickup device 12, but the image size in the vertical direction is
It is 1/2 size. Therefore, in order to adjust the size ratio in the vertical direction and the horizontal direction, the size conversion processing of the aspect ratio is performed. For example, when a recorded image with the resolution originally obtained by the CCD image pickup device 12 is generated, a process of complementing a vertical blank line is performed to generate a recorded image GF2 (FIG. 8).
(C)).

Further, other image processing may be performed. The image data obtained from the recording field F2 is subjected to image processing with a color image as it is.

Then, the image data for recording which has been subjected to the image processing is stored in the VRAM 41 by the control CPU 20 and displayed as an image on the LCD 51 (step S3).
8). With this image display, the user can confirm the image taken while operating the shutter button 61.

Then, the control CPU 20 records the image data for recording, which has been subjected to the image processing, on the memory card 8 mounted in the card loading chamber 72, and stores the image data obtained as a result of photographing.

By performing the above-described processing, image display is performed using the image exposed in the display field F1 during photographing of the subject, that is, during exposure of the recording field F2 in the CCD image pickup device 12. Therefore, the content of the image being exposed can be visually recognized.

An example will be described in which the object to be photographed (object) is a fireworks display. FIG. 9 shows images P1 sequentially obtained from the display field F1 every 1/10 sec.
10 to P5, and FIG. 10 shows display images G1 to G on the LCD 51 that are sequentially updated based on those images.
It is a figure which shows 5.

Immediately after the shutter button 61 is pressed, the image P1 obtained from the display field F1 and the LCD 5 are displayed.
The image G1 displayed in No. 1 is the same image. Next, the image P2 obtained from the display field F1 is added to the previous display image G1 and the image G2 is displayed on the LCD 51. Therefore, the displayed image G2 is an image in which the loci of rising fireworks balls are combined. Next, the image P3 obtained from the display field F1 is added to the preceding display image G2, and the image G3 is displayed on the LCD 51.

Next, the image P4 obtained from the display field F1 is added to the preceding display image G3, and LC
The image G4 is displayed on D51. Further subsequently, the image P5 obtained from the display field F1 is added to the preceding display image G4, and the image G5 is displayed on the LCD 51.

Therefore, the exposure state which is advancing in the recording field F2 is displayed on the LCD 51 as it is, and the user can confirm the image being photographed even during photographing. .

In the present embodiment, when the shutter signal is in the on state, the images are sequentially read from the display field F1 and the images sequentially obtained are added. Therefore, the composite image obtained by the addition is added. May be used as the recording image. However, when reading out during exposure, the charge transfer path of the CCD image pickup device 12 is easily affected by noise called smear, and it is not preferable to use it as a recording image for which a high quality image is required. On the other hand, since the image for display is a temporary image and is not stored, it is considered that the image quality does not have to be so high. Therefore, in this embodiment, the display field F1 is used.
While the image is sequentially read out for display at regular intervals, the recording field F2 is configured to expose the recording image with high quality.

<3. Modifications> Although the embodiments of the present invention have been described above, the present invention is not limited to the above description.

For example, in the above description, the image obtained from the first field F1 is used for display and the second field is used.
The image obtained from the field F2 was used for recording, but the present invention is not limited to this. This is because, if attention is paid to the fact that two types of images can be obtained only by making the exposure times of the first field F1 and the second field F2 different, the use of these images is not particularly limited. .

Further, in the above description, the arrangement of the color components for each pixel of the image pickup means for photographing the subject is not limited to the above, and may be any arrangement. Then, the first field F1 and the second field F
Also with respect to the division form with 2, the line may be divided into one line or every three or more lines.

Further, in the above description, an example in which an image obtained from the display field F1 is displayed in a state of being converted from a color image to a luminance image in order to increase sensitivity has been described, but the present invention is not limited to this. Instead, the color image may be displayed as it is. Further, in the above description, the bulb photographing is mainly taken as an example, but the present invention is not limited to this, and the present case may be applied to a long-time exposure of, for example, several tens of seconds. In addition, the mode may be selected so that the normal field recording can be switched to.

[0070]

As described above, according to the first aspect of the invention, the recording process of the image data obtained from the pixel column of the second field is performed and the pixel column of the second field is exposed. Since the image display processing is performed using the image data obtained from the pixel column of the first field, it is possible to confirm the subject image during the exposure during the exposure of the digital camera.

According to the second aspect of the invention, the exposure time of the pixel row of the first field is set shorter than the exposure time of the pixel row of the second field, and the image data obtained from the pixel row of the second field is set. Is recorded in a predetermined recording means, so that a high quality image is recorded in the recording means.

According to the third aspect of the invention, since the image is displayed on the predetermined display means based on the image data obtained from the pixel row of the first field, the image display is performed during the exposure of the pixel row of the second field. It can be performed.

According to the fourth aspect of the invention, the exposure of the pixel row of the first field and the image display are repeated until the exposure of the pixel row of the second field is completed, and the repeated image display is performed. When performing, the image data obtained from the pixel column of the first field and the previously displayed image data are subjected to a predetermined process and then displayed, so that the pixel column of the second field is displayed. An image can be displayed during the exposure of, and the display content can be sequentially updated.

According to the fifth aspect of the present invention, since the image data obtained from the pixel column of the first field and the image data displayed last time are added, the pixel column of the second field is added. It is possible to display an image suitable for the exposure state of, and the display contents can be sequentially updated.

According to the sixth aspect of the invention, the gain adjustment is performed on both the image data obtained from the pixel row of the second field and the image data obtained from the pixel row of the first field. Since the gain for the image data obtained from the pixel column of the first field is set to be larger than the gain for the image data obtained from the pixel column of the second field, good image display can be performed even when the subject is dark.

According to the seventh aspect of the present invention, it is possible to take a picture during the exposure of the digital camera while confirming the subject image during the exposure.

According to the eighth aspect of the present invention, it is possible to confirm the subject image during the exposure even during the exposure of the digital camera.

[Brief description of drawings]

FIG. 1 is a diagram showing an appearance of a digital camera.

FIG. 2 is a diagram showing an appearance of a digital camera.

FIG. 3 is a block diagram showing a functional internal configuration of a digital camera.

FIG. 4 is a diagram showing an example of a pixel array in a CCD image sensor.

FIG. 5 is a timing chart when a shutter button is operated.

FIG. 6 is a flowchart showing a processing sequence in the digital camera.

FIG. 7 is a diagram showing a conversion process of image data obtained from a display field by image processing.

FIG. 8 is a diagram showing a conversion process by image processing of image data obtained from a recording field.

FIG. 9 is a diagram showing images sequentially obtained from display fields.

FIG. 10 is a diagram showing a display image that is sequentially updated based on the image of FIG.

[Explanation of symbols]

1 digital camera 8 Memory card (recording means) 9 Setup card (recording medium) 12 CCD image sensor (imaging means) 20 Control CPU (control means) 51 LCD (display means) F1 display field (first field) F2 recording field (second field)

Claims (8)

(57) [Claims] 1. A digital camera for photographing a subject and recording image data, comprising: image pickup means having a pixel row of a first field and a pixel row of a second field; and a digital camera obtained from the pixel row of the second field. The image data recording process is performed, and the image display process is performed by using the image data obtained from the pixel column of the first field during the exposure of the pixel column of the second field. Characteristic digital camera. 2. A digital camera for photographing a subject and generating image data, comprising: an image pickup unit having a pixel row of a first field and a pixel row of a second field; and an exposure of the pixel row of the first field. Control means for controlling the time and the exposure time of the second field so as to be different from each other, wherein the control means sets the exposure time of the pixel row of the first field to the exposure time of the pixel row of the second field. A digital camera characterized in that the image data obtained from the pixel array of the second field is recorded in a predetermined recording means. 3. The digital camera according to claim 2, wherein the control unit causes a predetermined display unit to display an image based on image data obtained from the pixel row of the first field. . 4. The digital camera according to claim 3, wherein the control unit repeats the exposure of the pixel row of the first field and the image display until the exposure of the pixel row of the second field is completed. When performing repeated image display, a predetermined process is performed using the image data obtained from the pixel array of the first field and the previously displayed image data, and then the image is displayed. And a digital camera. 5. The digital camera according to claim 4, wherein the predetermined process is a process of adding image data obtained from a pixel array of the first field and previously displayed image data. And a digital camera. 6. The digital camera according to claim 3, wherein the control unit is image data obtained from a pixel row of the second field and image data obtained from a pixel row of the first field. And the gain adjustment is performed for both of them, and the gain for the image data obtained from the pixel row of the first field is set to be larger than the gain for the image data obtained from the pixel row of the second field. A digital camera that does. 7. An image processing method for photographing an object and recording image data by using an image pickup means having a pixel column of a first field and a pixel column of a second field, wherein the pixel column of the second field. Exposure of the first field pixel row is repeatedly performed until the exposure is completed, and image display is performed based on image data sequentially obtained from the first field pixel row, and the second field pixel row is displayed. The step of performing image recording based on the image data obtained from the pixel row of the second field when the exposure of step 2 is completed. 8. A program for recording an image for causing the digital camera to function as the digital camera according to claim 1 by being installed in a microcomputer incorporated in the digital camera. Characteristic computer-readable recording medium.