JP6246175B2 - Imaging apparatus for imaging subject trajectory and control method of imaging apparatus - Google Patents

Imaging apparatus for imaging subject trajectory and control method of imaging apparatus Download PDF

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JP6246175B2
JP6246175B2 JP2015201315A JP2015201315A JP6246175B2 JP 6246175 B2 JP6246175 B2 JP 6246175B2 JP 2015201315 A JP2015201315 A JP 2015201315A JP 2015201315 A JP2015201315 A JP 2015201315A JP 6246175 B2 JP6246175 B2 JP 6246175B2
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control
shooting
exposure time
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JP2017073741A (en
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大久保 俊之
俊之 大久保
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キヤノン株式会社
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Description

  The present invention relates to an imaging apparatus capable of imaging a trajectory of a moving subject and a method for controlling the imaging apparatus.

  In recent years, imaging devices such as home video cameras and digital still cameras have become popular. These imaging devices provide a function for confirming a photographed image on the spot, and the convenience of photographing is improved for the user.

  Moreover, since the sensitivity of the image sensor of the compact digital camera has been improved and the SN has also been improved, there is also a model equipped with a mode in which the starry sky can be easily photographed. There are a mode for shooting a starry sky, and a mode for shooting a trajectory of stars moving with time.

  Japanese Patent Application Laid-Open No. 2004-133826 proposes a method of shooting a starry sky locus by shooting a plurality of times and performing comparatively bright synthesis.

JP2013-62740A

  However, when the starry sky locus is photographed by the method of Document 1, etc., there is a problem that the locus is interrupted between photographing. This is because the stars are constantly moving during the exposure of shooting, but when straddling between shootings, the output of the pixel where the stars are exposed will span two images, and for each image The output of the star pixel will be half of the normal output. For this reason, when a comparatively bright combination is performed by shooting a plurality of images, there is a problem that the locus is interrupted.

  SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide an imaging apparatus and an imaging apparatus control method that hardly generate an image with an interrupted trajectory, in an imaging apparatus that captures a trajectory of a subject. .

In order to solve the above problems, one form of an imaging apparatus according to the present invention includes an imaging unit having an imaging element, a control unit for controlling an exposure time of the imaging unit, and the imaging unit images the starry sky a plurality of times. Generating means for generating a starry sky image representing a star movement trajectory by combining the images, and the control means is configured such that the amount of star movement on the image plane of the image pickup device in each photographing is the amount of movement of the image pickup device. The exposure time is controlled so as to be within the length of two pixels .

With the configuration described in the means for solving the problem,
In the mode for photographing the star trail, it is possible to photograph a high-quality image without any interruption in the star trail.

It is a block diagram of this embodiment. It is a screen for selecting the shooting mode of the starry sky of the present embodiment. It is the figure which showed the flow of the starry night view photography mode of this embodiment. It is the figure which showed the flow of the starry sky locus | trajectory imaging mode of this embodiment. It is the figure which showed the cause which a discontinuation generate | occur | produces by comparative bright combination. It is the figure which showed the program diagram of the starlit sky photography mode of this embodiment. It is the table | surface which showed the relationship between the shutter speed of a break improvement of this embodiment, and a focal distance. It is a figure for converting the movement of a star of this embodiment, and a focal distance into a formula. It is a figure showing the relationship between the imaging | photography direction and shutter speed of this embodiment.

<First Embodiment>
Hereinafter, the present embodiment will be described with reference to the drawings. FIG. 1 is a diagram illustrating a configuration of a digital camera 100 as an example of an imaging apparatus according to the present embodiment. One or more of the functional blocks shown in FIG. 1 may be realized by hardware such as an ASIC or a programmable logic array (PLA), or may be realized by a programmable processor such as a CPU or MPU executing software. May be. Further, it may be realized by a combination of software and hardware. Therefore, in the following description, even when different functional blocks are described as the operation subject, the same hardware can be realized as the subject.

  10 is a photographic lens, 12 is a mechanical shutter having an aperture function, 14 is an image sensor that converts an optical image into an electrical signal, and 16 is an analog / digital (A / D) that converts an analog signal output of the image sensor 14 into a digital signal. ) Converter. In the present embodiment, the image sensor 14 is described as a CMOS sensor with a pixel configuration of a Bayer array (R, G1, G2, B) having color filters for each color. However, the sensor modes to which the present invention can be applied are not limited thereto. Absent.

  A timing generation circuit 18 supplies a clock signal and a control signal to the image sensor 14 and the A / D converter 16, and is controlled by the memory control circuit 22 and the system control circuit 50. In addition to the twelve mechanical shutters, the accumulation time can be controlled as an electronic shutter by controlling the reset timing of the eighteen image sensors, and can be used for moving image shooting and the like.

  An image processing circuit 20 performs predetermined pixel interpolation processing and color conversion processing on the data from the A / D converter 16 or the data from the memory control circuit 22. Further, an electronic zoom function is realized by performing image cutting and scaling processing by 20 image processing circuits.

  Further, the image processing circuit 20 performs predetermined arithmetic processing using the captured image data. Based on the calculation result obtained by the image processing circuit 20, the system control circuit 50 performs TTL (Through The Lens) AF processing and AE (Auto Exposure) processing on the exposure control means 40 and the distance measurement control means 42. ing.

  Further, the image processing circuit 20 performs predetermined arithmetic processing using captured image data, and also performs TTL AWB (auto white balance) processing based on the obtained arithmetic result.

  A memory control circuit 22 controls the A / D converter 16, the timing generation circuit 18, the image processing circuit 20, the memory 30, and the compression / decompression circuit 32.

  The data of the A / D converter 16 is written into the memory 30 via the image processing circuit 20 and the memory control circuit 22, or the data of the A / D converter 16 is directly written via the memory control circuit 22.

  Reference numeral 28 denotes an image display unit composed of a TFT LCD or the like, and display image data written in the memory 20 is displayed by the image display unit 28 via the memory control circuit 22.

  If the image data captured using the image display unit 28 is sequentially displayed, the electronic viewfinder function can be realized.

  The image display unit 28 can arbitrarily turn on / off the display according to an instruction from the system control circuit 50. When the display is turned off, the power consumption of the image processing apparatus 100 can be greatly reduced. I can do it.

  Reference numeral 30 denotes a memory for storing captured still images and moving images, and has a sufficient storage capacity to store a predetermined number of still images and a predetermined time of moving images.

  This makes it possible to write a large amount of images to the memory 30 at high speed even in continuous shooting or panoramic shooting in which a plurality of still images are continuously shot.

  The memory 30 can also be used as a work area for the system control circuit 50.

  Reference numeral 31 denotes a non-volatile memory composed of a flash ROM or the like. The program code executed by the system control circuit 50 is written in the nonvolatile memory 31, and the program code is executed while being read sequentially. In addition, an area for storing system information and an area for storing user setting information are provided in the nonvolatile memory, and various information and settings are read and restored at the next startup.

  Reference numeral 32 denotes a compression / decompression circuit that compresses and decompresses image data by adaptive discrete cosine transform (ADCT) or the like. Write to.

  Reference numeral 40 denotes an exposure control means for controlling the shutter 12 having a diaphragm function, and has a flash light control function in conjunction with the flash 48.

  Reference numeral 42 denotes distance measurement control means for controlling the focusing of the photographing lens 10, and reference numeral 44 denotes zoom control means for controlling the zooming of the photographing lens 10.

  A flash 48 has an AF auxiliary light projecting function and a flash light control function.

  The exposure control means 40 and the distance measurement control means 42 are controlled using the TTL method. Based on the calculation result obtained by calculating the captured image data by the image processing circuit 20, the system control circuit 50 performs the exposure control means 40 and the distance measurement. Control is performed on the control means 42.

  A system control circuit 50 controls the entire image processing apparatus 100.

  Reference numerals 60, 62, 64, 66, 70, and 72 denote operation means for inputting various operation instructions of the system control circuit 50. A single unit such as a switch, a dial, a touch panel, pointing by line-of-sight detection, a voice recognition device, or the like Consists of multiple combinations.

  Here, a specific description of these operating means will be given.

  Reference numeral 60 denotes a mode dial switch, which switches between power off, automatic shooting mode, normal shooting mode (still image), starry sky shooting mode, panoramic shooting mode, moving image shooting mode, playback mode, PC connection mode, and the like. I can do it.

  Reference numeral 62 denotes a shutter switch SW1, which is turned on during the operation of the shutter button, and instructs to start operations such as AF (autofocus) processing, AE (automatic exposure) processing, and AWB (auto white balance) processing.

  A shutter switch SW2 64 is turned on when the operation of the shutter button is completed. In the case of flash photography, after performing EF (flash pre-emission) processing, the image sensor 14 is exposed for the exposure time determined by the AE processing. In the case of flash photography, light is emitted during this exposure period, and light is shielded by the exposure control means 40 simultaneously with the end of the exposure period, thereby completing the exposure to the image sensor 14. Thereafter, the system control circuit 50 performs a read process of writing image data to the memory 30 via the A / D converter 16 and the memory control circuit 22 from the signal read from the image sensor 14. Further, the image data is read out from the development process using the calculation in the image processing circuit 20 and the memory control circuit 22 and the memory 30 and compressed in the compression / decompression circuit 32. Further, a recording process for writing image data to the recording medium 200 is performed. The instruction to the shutter switch SW2 instructs to start the operation of these series of processes.

  Reference numeral 66 denotes a display changeover switch, which can change the display of the image display unit 28. With this function, when photographing is performed using the optical viewfinder 104, it is possible to save power by cutting off the current supply to the image display unit including a TFT LCD or the like.

  Reference numeral 70 denotes an operation unit including various buttons, a touch panel, a rotary dial, and the like, which include a menu button, a set button, a macro button, a multi-screen playback page break button, a flash setting button, a single shooting / continuous shooting / self-timer switching button, and the like. . Menu move + (plus) button, menu move-(minus) button, playback image move + (plus) button, playback image move-(minus) button, shooting image quality selection button, exposure compensation button, date / time setting button, etc. There is also.

  Reference numeral 72 denotes a zoom switch unit as zoom operation means for a user to give an instruction to change the magnification of a captured image. Hereinafter, the zoom switch 72 is also referred to. The zoom switch 72 includes a tele switch that changes the imaging field angle to the telephoto side and a wide switch that changes the imaging angle of view to the wide angle side. By using the zoom switch 72, the zoom control unit 44 is instructed to change the imaging field angle of the photographing lens 10 and becomes a trigger for performing an optical zoom operation. In addition, it also serves as a trigger for electronic zooming change of the imaging angle of view by image cropping by the image processing circuit 20 or pixel interpolation processing.

  74 is a thermistor for measuring the temperature inside the camera. Since defective pixels of the image sensor are affected by temperature, it is necessary to change the flaw correction processing depending on the temperature at the time of shooting. The thermistor is disposed near the image sensor in the image pickup apparatus, and measures the temperature of the image sensor itself.

  Reference numeral 86 denotes a power supply means including a primary battery of an alkaline battery, a secondary battery such as a NiCd battery, a NiMH battery, or a Li ion battery, an AC adapter, or the like.

  Reference numeral 90 denotes an interface with a recording medium such as a memory card or hard disk, and reference numeral 92 denotes a connector for connecting to a recording medium such as a memory card or hard disk.

  Reference numeral 102 denotes protection means that is a barrier that prevents the imaging unit from being soiled or damaged by covering the imaging unit including the lens 10 of the image processing apparatus 100.

  Reference numeral 104 denotes an optical viewfinder, which can take an image using only the optical viewfinder without using the electronic viewfinder function of the image display unit 28.

  A communication unit 110 has various communication functions such as USB, IEEE1394, LAN, and wireless communication.

  Reference numeral 112 denotes a connector for connecting the image processing apparatus 100 to another device by the communication unit 110 or an antenna in the case of wireless communication.

  Reference numeral 200 denotes a recording medium such as a memory card or a hard disk.

  The recording medium 200 includes a recording unit 202 composed of a semiconductor memory, a magnetic disk, or the like, an interface 204 with the image processing apparatus 100, and a connector 206 for connecting to the image processing apparatus 100.

  Reference numeral 210 denotes a recording medium such as a memory card or a hard disk.

  FIG. 2 is a screen for selecting a starry sky shooting mode.

  The user can select the starry sky shooting mode by operating the operation unit 70 while referring to sample images of the shot images in each mode as shown in FIG. In the present embodiment, as a starry sky shooting mode, a starry night view mode for shooting a star as a point in one shooting, and a starry sky trajectory mode for shooting a plurality of times for shooting a trajectory of moving stars. Have.

  For the selected mode, the system control circuit 50 writes the mode information in the memory 30 and stores the mode selected by the user.

  3 and 4 are flowcharts showing the night sky shooting mode and the starry locus shooting mode, respectively. Each step is executed by each unit in accordance with the instruction from the system control circuit 50 or the system control circuit 50. Before entering this flow, it is assumed that various settings for photographing the night sky of the star have been made in advance by the user. The various settings include, for example, white balance, setting of the strength of noise reduction processing, exposure time in the starry sky shooting mode (when set manually), total shooting time in the starry sky locus mode, and the like.

  When the user presses the shutter switch 64 to give a shooting instruction, the system control circuit 50 reads out the mode stored in the memory 30 and performs shooting processing in the specified shooting mode.

  If the stored shooting mode is the starry night view mode, processing is performed by each unit in the flow shown in FIG. In step S101, the aperture, shutter speed, and ISO sensitivity are set based on the photometric result. Although details will be described later with reference to FIG. 5, in this mode, exposure control is performed so that stars have appropriate brightness as dots. In S102, a still image is taken based on the exposure control set in S101. In S103, the captured image is developed using the image processing circuit 20, and in S104, the system control circuit 50 encodes the image developed by the image processing circuit 20 using a predetermined encoding method. For example, writing to the recording medium 200 is performed. In this embodiment, the image is recorded after the development processing, but may be recorded as a so-called RAW image without performing the development processing.

  Next, if the stored shooting mode is the starry sky trajectory mode, the user sets a total shooting time in advance in S201. A long shooting time is set when it is desired to capture a star trail for a long time, and a short shooting time is set when a short locus is desired. Usually, shooting times of 1 to 2 hours are often set.

  In step S202, the aperture based on the photometric result and the shutter speed and ISO sensitivity for one shooting are set. Although details will be described later with reference to FIG. 5, in this embodiment, in this mode, the trajectory of moving stars is left in the image, and exposure control and shooting are performed so that the trajectory is not interrupted in the final image. . In S203, still images are continuously shot based on the exposure control and shooting settings set in S202. In S204, a comparatively bright combination process with the images captured up to the previous time is performed after the second imaging. In the case of the first shooting, the image processing unit 20 holds the shot image on the memory for performing the comparatively bright combination process and proceeds to the next. In S204, a comparatively bright combination process is performed on the combined image obtained by combining the previously captured images and the captured image captured this time. The comparatively bright combination process is a process that compares the pixel levels of corresponding pixels between images and leaves the pixel level not lower. In the present embodiment, synthesis is performed in the state of RGB signals obtained by the Bayer array, and pixel levels are compared between R, G, and B pixels. However, the present invention is not limited to this, and the RGB signal may be converted into a YUV (luminance and color difference) 422 signal, and then the Y and UV signals between the images may be compared. Further, the unit to be compared is not necessarily one pixel unit. For example, in RGB in a Bayer array state, the comparison may be performed by comparing the average value, the intermediate value, and the like in one Bayer unit (RG1G2B).

  Since stars always move in the sky as seen by the photographer, the positions of the stars differ between the images to be synthesized. For this reason, by performing comparison, it is possible to synthesize a continuous trajectory without erasing the star trajectories of the two trajectories reflecting the movement of the stars. In S205, it is determined whether or not the time set in advance by the user has elapsed. If the set time is not reached, the process returns to S203 and repeats the shooting / combination processing. If the set time is exceeded, the shooting is completed. The process proceeds to S206.

  In S206, the captured image is developed using the image processing circuit 20, and in S207, the system control circuit 50 encodes the image developed by the image processing circuit 20 using a predetermined encoding method. For example, writing to the recording medium 200 is performed. At this time, by combining a plurality of still images, a final image having a trajectory by connecting the stars of the combined images is generated and recorded. As in the starry sky shooting mode, a composite image (final image) may be recorded as a RAW image before development.

  FIG. 5 is an image diagram for explaining the cause of discontinuity in the star trajectory when the starry sky photographed image is synthesized by the comparatively bright synthesis process.

  FIG. 5A schematically shows the brightness of stars in images taken on the Nth and N + 1th images during long-second shooting. For example, when shooting for a long time of about 30 seconds, the stars move in the sky due to the rotation of the earth. Therefore, especially for stars with a size that spans multiple pixels, the amount of exposure compared to the center portion of the end portion There are few, and it becomes thin.

  When such two images are comparatively brightly combined, the light from the star straddles the two images, and the output per sheet is halved in the main combining process, which is the selective combining. For this reason, when comparatively bright combination is performed in long-second shooting, the interruption of the image may be conspicuous.

  On the other hand, as shown in FIG. 5 (b), if the shooting is performed in a reasonably short time, stars that do not appear as if the star trajectory does not appear in the star image per image stop and the image is low in light and shade. By comparing and synthesizing each other, the trajectory is less likely to be interrupted.

  FIG. 6 is a diagram showing a program diagram in the starry sky shooting mode.

  In the figure, the program diagram of the starry night view mode and the starry sky locus mode is written.

  The program diagram in the starry night view mode is a program diagram that balances the shutter speed at which the stars do not flow easily and the high-sensitivity noise that is not noticeable. The aperture goes to the open side as soon as possible, and then the ISO sensitivity is increased while increasing the shutter speed.

  On the other hand, the program chart in the starry sky locus mode has a shutter speed that is shorter than the movement of the star and gives priority to the shutter speed that can be synthesized by suppressing the interruption of the star locus. In this embodiment, the shutter speed is a maximum of 8 seconds. Keep it below. When the shutter speed reaches the maximum time, the aperture is opened and finally the ISO sensitivity is increased.

  As described above, the shutter speed in the starry sky trajectory mode is shorter than that in the starry night view mode even under the exposure conditions of the scene considered to be the darkest starry sky.

  Thus, in the starry sky trajectory mode, it is possible to prevent the trajectory from being interrupted in the combined image by setting a shutter speed of 8 seconds or less even in a dark scene.

  FIG. 7 is a table showing the relationship between the shutter speed and the focal length for improving discontinuity.

  The shutter speed described with reference to FIG. 6 is a shutter speed when a focal length is taken at 24 mm in 35 mm format conversion. If the focal length changes, the movement of the stars on the imaging surface per unit time (within the angle of view) increases, so the shutter speed at which interruption is improved differs. For example, it is effective to set it to 3.8 seconds or less at a focal length of 50 mm.

  This relationship will be described later in detail with reference to FIG.

  FIG. 8 is a diagram for converting star movement and focal length into equations.

  Generally, as shown in FIG. 8A, the lens focal length, the angle of view, and the line length on the imaging surface of the imaging element 14 have the following relationship.

Angle of view: θ Focal length: f Line length on the imaging surface: d
Considering this relationship in association with stars on the imaging surface, the angle of view can be replaced with the rotation angle of the star, and the line length on the imaging device can be replaced with the amount of movement of the star, so as shown in FIG. Can be read as

Star rotation angle: θ Focal length: f Amount of star movement on the imaging surface: d
Further, the shutter speed Tv is obtained as follows using the rotation angle θ of the star.

  Here, the reason why the trajectory is not interrupted if the exposure is 8 seconds or less in the present embodiment will be described below.

  When a star is exposed with the configuration of the Bayer array as in the present embodiment, it does not appear as an image unless light from the star is received over at least two pixels. On the other hand, with respect to a star that can receive light across a plurality of pixels of two or more pixels, if a movement amount of two or more pixels is allowed, shading appears in the locus.

  For example, if the sensor size is a 1-type image sensor and the number of pixels is 20 million, the pixel pitch is 2.4 μm. A lens having a focal length of 24 mm in terms of 35 mm has an actual focal length of 8.8 mm. Since the distance for moving this two pixels on the image sensor is 2.4 μm × 2, it is expressed by the following equation.

  If 7.5 sec is rounded up to the camera standard exposure time, 8 sec is obtained. That is, a star receiving light with a size of about one pixel under the above-described shooting conditions is highly likely not to be captured as an image unless exposed for about 8 seconds. In addition, if a star straddling two or more pixels is exposed for more than 8 seconds, there is a high possibility that the trajectory will be shaded due to the movement of the star. Therefore, in the starry sky trajectory mode of this embodiment, as shown in FIG. 6, the diagram is configured so that an exposure time of 8 seconds is obtained under many exposure conditions at a pixel pitch of 2.4 μm and a focal length of 24 mm in terms of 35 mm. Yes. Incidentally, when the pixel pitch is 1.6 μm under the same conditions, the exposure time of 5 seconds is appropriate.

  FIG. 9 is a diagram illustrating the relationship between the shooting direction and the shutter speed.

  As shown in FIG. 9, the optimum shutter speed at which the trajectory is not interrupted differs depending on the latitude of the shooting point and the shooting elevation angle. The above-mentioned number of the focal length of 24 mm and the shutter speed of 8 seconds is an example in the case of shooting in the direction of the celestial equator where the moving speed of the star is fastest. If the elevation angle is shifted from this, the moving speed of the stars will slow down, so the shutter time can be lengthened.

When this is represented in the figure, it is assumed that the shooting point P is at a position of latitude α ° on the earth. At this time, the direction perpendicular to the rotation axis of the earth is the celestial equator direction, and the moving speed of the star is the fastest. The imaging elevation angle with respect to the celestial equator direction is β, the optimum shutter speed previously obtained from the focal length is Tv, and the optimum shutter speed Tv ′ at the imaging elevation angle β has the following relationship.
Tv ′ = Tv × cos β
Thereby, the optimal shutter speed which changes with imaging | photography elevation angles can be calculated | required. In order to perform the control according to the latitude on the earth of the imaging apparatus as described above, a positioning means such as GPS (not shown) and an angle detection means such as a gyro sensor or a gravity sensor for detecting the angle of the imaging apparatus are provided. That's fine.

  In the present embodiment, in the description of FIG. 8, the shooting elevation angle is calculated on the assumption that the direction of the optical axis center is in the celestial equator direction. To get the best shutter speed. In addition, since an example is given with a calculation formula ignoring distortion aberration due to the lens, for example, calculation may be performed in consideration of each shooting condition stored in advance in the memory 30 and the distortion aberration correction amount of the shot image at the image height. .

  The program diagram of FIG. 6 also intersects the program diagram in the starry night view mode and the starry locus mode, but may be set so as not to intersect.

  The standard shooting time is 8 seconds. However, as the resolution increases as the number of pixels of the image sensor increases, the strictness of the standard shooting time changes. You should change it.

(Other embodiments)
The object of the present invention can also be achieved as follows. That is, a storage medium in which a program code of software in which a procedure for realizing the functions of the above-described embodiments is described is recorded is supplied to the system or apparatus. The computer (or CPU, MPU, etc.) of the system or apparatus reads out and executes the program code stored in the storage medium.

  In this case, the program code itself read from the storage medium realizes the novel function of the present invention, and the storage medium and program storing the program code constitute the present invention.

  Examples of the storage medium for supplying the program code include a flexible disk, a hard disk, an optical disk, and a magneto-optical disk. Further, a CD-ROM, CD-R, CD-RW, DVD-ROM, DVD-RAM, DVD-RW, DVD-R, magnetic tape, nonvolatile memory card, ROM, or the like can also be used.

  Further, by making the program code read by the computer executable, the functions of the above-described embodiments are realized. Furthermore, when the OS (operating system) running on the computer performs part or all of the actual processing based on the instruction of the program code, the functions of the above-described embodiments are realized by the processing. Is also included.

  Furthermore, the following cases are also included. First, the program code read from the storage medium is written in a memory provided in a function expansion board inserted into the computer or a function expansion unit connected to the computer. Thereafter, based on the instruction of the program code, the CPU or the like provided in the function expansion board or function expansion unit performs part or all of the actual processing.

  In addition, the present invention is not limited to devices such as digital cameras, but includes built-in or external connection of imaging devices such as mobile phones, personal computers (laptop type, desktop type, tablet type, etc.), game machines, etc. It can be applied to any device. Therefore, the “imaging device” in this specification is intended to include any electronic device having an imaging function.

DESCRIPTION OF SYMBOLS 10 Shooting lens 12 Shutter 14 Image pick-up element 16 A / D converter 18 Timing generation circuit 20 Image processing circuit 22 Memory control circuit 28 Image display part 30 Memory 32 Image compression / decompression circuit 40 Exposure control part 42 Distance control part 44 Zoom control 48 Flash 50 System control circuit 60 Mode dial switch 62 Shutter switch SW1
64 Shutter switch SW2
66 Display change switch 70 Operation unit 72 Zoom switch 74 Thermistor 200 Recording medium 202 Recording unit 204 Interface

Claims (11)

  1. Imaging means having an imaging element;
    Control means for controlling the exposure time of the imaging means;
    Generating means for generating a starry sky image representing a moving trajectory of stars by photographing the starlit sky a plurality of times and synthesizing the images;
    The said control means controls the said exposure time so that the movement amount of the star on the image surface of the said image pick-up element in each imaging | photography may be settled in the length of 2 pixels of the said image pick-up element .
  2.   The imaging apparatus according to claim 1, wherein the control unit performs control based on a pixel pitch and a focal length of the imaging element.
  3. It said control means, the image pickup apparatus according to claim 1 or 2, wherein the controller controls the exposure time according to the latitude of the shooting point.
  4. It said control means, the image pickup apparatus according to any one of claim 1 to 3, wherein the controller controls the exposure time according to the elevation angle at the time of shooting.
  5. A control step for controlling an exposure time of an imaging means having an imaging element;
    A shooting step of shooting the starry sky multiple times with the exposure time set in the control step;
    Generating a starry sky image representing a moving locus of a star by combining a plurality of images obtained in the photographing step; and
    In the control step, the exposure time is controlled so that a moving amount of a star on an image plane of the image sensor in each photographing is within a length of two pixels of the image sensor.
  6. Imaging means having an imaging element;
    Control means for controlling the exposure time of the imaging means;
    Generating means for generating a starry sky image representing a moving trajectory of stars by combining a plurality of images obtained by imaging the starry sky with the imaging means;
    In the image per one of the plurality of images, the control means causes the star trajectory to be shaded due to a difference in exposure amount due to a star moving on the image plane of the image sensor. An image pickup apparatus, wherein the exposure time is controlled so as to suppress the above.
  7. The image pickup apparatus according to claim 6, wherein the control unit controls the exposure time based on a pixel pitch and a focal length of the image pickup element.
  8. The imaging apparatus according to claim 6 or 7, wherein the control unit controls the exposure time according to a latitude of an imaging point.
  9. The image pickup apparatus according to claim 6, wherein the control unit controls the exposure time according to an elevation angle at the time of shooting.
  10. 10. The imaging apparatus according to claim 6, wherein the generation unit generates the starry sky image by performing comparatively bright combination of the plurality of images.
  11. A control step for controlling an exposure time of an imaging means having an imaging element;
    A shooting step of shooting the starry sky multiple times with the exposure time set in the control step;
    Generating a starry sky image representing a moving trajectory of a star by synthesizing a plurality of images obtained in the photographing step; and
    In the control step, in the image per one of the plurality of images, the star trajectory is shaded due to the difference in the exposure amount due to the movement of the star on the image plane of the image sensor. An imaging method characterized in that the exposure time is controlled so as to suppress the above.
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