JP2007074364A - Imaging apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an imaging apparatus which prevents photographing of faulty image data. <P>SOLUTION: A digital still camera 10 is provided with a normal photographing mode and a macro photographing mode. A subject at a normal distance is photographed by the digital still camera 10 where the macro photographing mode is selected. A face display pixel extraction part 45 extracts pixels showing a width of a face of the subject of image data GD1 obtained by photographing, as the number of face display pixels. A determination part 47 determines whether the distance between the digital still camera 10 and the subject allows macro photographing or not by comparing the number of face display pixels with a reference number of face display pixels preliminarily stored in a ROM 26. In the case that the determination part 47 determines that the number of face display pixels is smaller than the reference number of face display pixels, a warning is given to a user by using a warning means to prompt the user to photograph again. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an imaging device that prevents shooting of defective image data.

  A digital still camera or camera with an imaging device that converts image signals obtained by imaging subject light with a solid-state imaging device such as a CCD into digital image data and stores the image data in a storage medium such as a memory card Cell phones are known. These imaging devices are equipped with a strobe device that emits strobe light in synchronization with shooting and compensates for insufficient subject brightness, and a macro shooting mode suitable for shooting a subject at a short distance. The normal shooting mode is a shooting mode for shooting at a long distance (for example, 1 m to infinity) in the distance to the subject (hereinafter referred to as the distance between the subjects), and the macro shooting mode has a distance between the subjects. This is a photographing mode for photographing at a short distance (for example, 10 cm to 1 m). When normal shooting (medium or long-distance shooting) is performed in this macro shooting mode, the target subject is not focused and a high-quality image cannot be obtained. Therefore, it is preferable that the digital still camera is equipped with a distance measuring sensor capable of measuring the distance between the subjects, and if the distance between the subjects is not suitable for the selected photographing mode, it is preferable to notify the photographer in advance.

The camera disclosed in Patent Document 1 reads subject light using a multi-auto focus (hereinafter referred to as multi-AF) that is a distance measuring sensor, and makes it possible to control an appropriate flash emission amount and exposure amount. In such multi AF, an object (subject) is irradiated with infrared rays, ultrasonic waves, and the like, and the distance is detected based on the time until the reflected wave returns and the irradiation angle.
JP-A-9-73116

  However, when the multi-AF disclosed in Patent Document 1 is used as a distance measuring unit for measuring the distance between subjects, an error in the detection distance occurs due to lens deformation accompanying a temperature change. Due to such detection distance errors, if the photographer does not realize that the distance between subjects is not suitable for the selected shooting mode or is outside the reachable range of the strobe light, the subject will be in focus. This results in defective image data such as no image data or low-brightness image data.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide an imaging apparatus that prevents shooting of defective image data.

  The present invention provides a photographing mode selection means for selecting a photographing mode from a normal photographing mode for photographing a subject at a normal distance and a macro photographing mode for photographing the subject at a short distance, and the subject obtained through the photographing lens. Imaging means for photoelectrically converting the subject light as an imaging signal, the imaging means generating the imaging signal from the subject light obtained from the photographing lens, and storing the imaging signal as digital image data A macro shooting mode detecting unit for detecting that the shooting mode selecting unit has selected a macro shooting mode, and extracting a set of pixels indicating a face from the image data as the number of face display pixels. And a face display pixel extracting means that performs the first farthest distance within the distance range that can be photographed in the macro photographing mode. The first determination for determining whether the face display pixel number for the subject at the farthest distance is the first reference face display pixel number, and which is smaller between the face display pixel number and the first reference face display pixel number And a warning means for warning the photographer about reshooting, and when the first determination means determines that the face display pixel number is smaller than the first reference face display pixel number, the warning means And a first warning is used.

  A flash shooting mode selection unit that selects whether or not to use a flash shooting mode that emits flash light to the subject at the time of shooting, and that the flash shooting mode selection unit detects that the use of the flash shooting mode is selected A strobe shooting mode detecting means for detecting the strobe light, a second farthest distance within a distance range where the strobe light can reach the subject, a second farthest distance, and a second number of face display pixels of the subject at the second farthest distance. Reference face display pixel number, and second determination means for determining which of the face display pixel number and the second reference face display pixel number is smaller, wherein the second determination means includes the face display pixel. When it is determined that the number is smaller than the second reference face display pixel number, it is preferable that a second warning is issued using the warning means.

  It is preferable to use the first or second reference face display pixel number determined from the first or second farthest distance, a screen diagonal length of the imaging device, and a focal length of the photographing lens.

  Preferably, the first and second reference face display pixel numbers are pixel numbers representing the face width of the subject at the first or second farthest distance, and represent an average value of the face width of the subject. More preferably, it is the number of pixels.

  The warning unit is preferably an image display device that displays an image, and preferably includes a display control unit that causes the image display device to display a message prompting re-taking as the first or second warning.

  The present invention also provides a flash shooting mode selection means for selecting whether or not to use a flash shooting mode for emitting a flash light to a subject at the time of shooting, and subject light from the subject obtained through the shooting lens as an imaging signal. In the imaging device, the imaging unit generates the imaging signal from the subject light obtained from the photographing lens, and stores the imaging signal as digital image data in a storage medium. Strobe shooting mode detection means for detecting that the flash shooting mode selection means has selected the use of the flash shooting mode; and face display pixels for extracting a set of pixels representing the face from the image data as the number of face display pixels The farthest distance within the distance range in which the strobe light can reach the subject is defined as the second farthest distance. The face display pixel number for the subject at the second farthest distance is defined as a second reference face display pixel number, and it is determined whether one of the face display pixel number and the second reference face display pixel number is smaller. 2 determining means and warning means for warning a photographer to reshoot, and when the second determining means determines that the face display pixel number is smaller than the second reference face display pixel number, the warning A second warning is provided using the means.

  It is preferable to use the second reference face display pixel number determined from the second farthest distance, the screen diagonal length of the imaging device, and the focal length of the photographing lens.

  The second reference face display pixel number is preferably the number of pixels representing the face width of the subject at the second farthest distance, and the number of pixels representing an average value of the face width of the subject. More preferred.

  The warning means is preferably an image display device that displays an image, and as the second warning, it is preferable that the warning means includes display control means for displaying a message prompting the user to retake the image.

  According to the imaging apparatus of the present invention, macro shooting mode detection means for detecting that the shooting mode selection means has selected the macro shooting mode, and a collection of pixels representing the face as the number of face display pixels from the image data. And a face display pixel extracting unit that performs the first farthest distance within the distance range that can be photographed in the macro photographing mode, and the number of face display pixels for the subject at the first farthest distance as the first reference face display pixel. A first determination unit that determines whether one of the face display pixel number and the first reference face display pixel number is small, and a warning unit that warns the photographer of reshooting, and the first determination unit includes: When it is determined that the number of face display pixels is smaller than the first reference face display pixel number, the warning means is used to give the first warning. Can be notified It is possible to avoid the loss of shooting opportunity.

  Further, according to the imaging apparatus of the present invention, the strobe shooting mode detecting means for detecting that the strobe shooting mode selects the use of the strobe shooting mode, and a set of pixels indicating the face from the image data as the number of face display pixels. The face display pixel extracting means for extracting, the farthest distance within the distance range in which the strobe light can reach the subject, the second farthest distance, and the number of face display pixels for the subject at the second farthest distance as the second reference face A determination unit that determines whether the display pixel number is smaller than the face display pixel number or the second reference face display pixel number, and a warning unit that warns the photographer of reshooting. When it is determined that the number of display pixels is smaller than the second reference face display pixel number, the warning means is used to give the second warning, so the photographer is informed that sufficient subject brightness cannot be obtained without the strobe light reaching. notification Becomes a function, it is possible to avoid the loss of shooting opportunity.

  The first or second farthest distance, the diagonal length of the screen of the imaging device, and the first or second reference face display pixel number determined from the focal length of the photographing lens are used. Further, the first and second reference face display pixel numbers are the pixel numbers representing the width of the face of the subject at the first or second farthest distance, and the first and second reference face display pixel numbers are the first or second Since the number of pixels represents the average value of the face width of the subject at the second farthest distance, the determination calculation process by the determination unit is simplified.

  The warning means is an image display device that displays an image and, as a warning, includes a display control means for displaying a message prompting the user to retake the image on the image display device. As a result, loss of photographing opportunities can be prevented.

  In FIG. 1, a digital still camera 10 includes a lens barrel 12 protruding from the front surface of a camera body 11. A photographing lens 13 is held on the lens barrel 12. The strobe light emitting unit 14 emits strobe light for supplementing subject brightness at the time of shooting when the strobe shooting mode is selected.

  On the upper surface of the digital still camera 10, an operation dial 15 and a release button 16 are provided that are operated when the power switch is turned on / off and the photographing mode / playback mode / setting mode is switched. The release button 16 can be pressed in two stages, a half-press operation and a full-press operation. When the release button 16 is pressed halfway, exposure adjustment and focus adjustment are performed in the selected shooting mode. When a full-press operation is performed to push the release button 16 in a state where the release button 16 is half-pressed, an image signal for one screen subjected to exposure adjustment and focus adjustment is converted into image data. Further, the image data is subjected to various image processing described later and stored in the memory card 18.

  In FIG. 2, a liquid crystal display panel 20 is provided on the rear surface of the digital still camera 10. The display panel 20 functions as an electronic viewfinder in the shooting mode, and displays a captured through image, a warning screen for notifying a photographer of predetermined information, and the like. In the playback mode, a still image stored as image data is displayed. Further, in the setting mode, various setting screens are displayed on the display panel 20.

  The memory card 18 is detachably loaded in a memory card slot 10a provided on the side surface of the digital still camera 10. Image data obtained in the shooting mode is stored in the memory card 18.

  The cursor button 21 is used for switching various settings and for operations on various processing confirmation screens displayed on the display panel 20. The decision button 22 is a button for executing the process selected by the cursor button 21. The shooting mode selection button 23 is a button for switching between a macro shooting mode for shooting a subject at a short distance and a normal shooting mode for shooting a subject at a normal distance. The strobe button 24 is a button for switching whether to use a strobe shooting mode in which a strobe light is emitted to a subject during shooting. By operating these buttons 23 and 24, a shooting mode suitable for shooting a subject can be selected.

  In FIG. 3, the control unit 25 reads the sequence program stored in the ROM 26 into the RAM 27, which is a work memory, and executes it. The control unit 25 controls each part of the digital still camera 10 in accordance with operation signals generated by operating the operation dial 15, the release button 16, the cursor button 21, the enter button 22, the shooting mode selection button 23, and the strobe button 24.

  By pressing the shooting mode selection button 23, a shooting mode switching signal is input to the control unit 25. The control unit 25 exclusively selects one of the normal shooting mode and the macro shooting mode in response to the detection of the input of the shooting mode switching signal. In this way, information on the selected shooting mode is stored in the RAM 27.

  In the lens barrel 12, a photographic lens 13 including a zoom lens 30 and a focus lens 31, and an aperture mechanism 32 are incorporated. Under the control of the control unit 25, the zoom lens 30 and the focus lens 31 are moved along the optical axis direction by the zoom motor 30a and the focus motor 31a provided with a driver circuit, and the change of the optical photographing magnification and the focus adjustment are performed. Done. The zoom lens 30 and the focus lens 31 are movable within a movable range corresponding to the shooting mode selected by the control unit 25. The aperture mechanism 32 is driven by an actuator 32a having a driver circuit, and the aperture diameter is switched.

  A CCD image sensor 33 is disposed behind the photographic lens 13. As is well known, the CCD image sensor 33 includes a photocathode in which a large number of light receiving elements are arranged in a matrix, and forms an image on the photocathode through the zoom lens 30, the focus lens 31, and the aperture mechanism 32. Subject light is photoelectrically converted as an imaging signal.

  The CCD image sensor 33 is driven by a CCD driver 33a. The charge accumulation time (exposure time) of the CCD image sensor 33 is determined according to the electronic shutter drive signal supplied from the CCD driver 33a. Then, in synchronization with the vertical transfer clock and horizontal transfer clock supplied from the CCD driver 33a, the charges accumulated for each pixel are output as a serial imaging signal line by line.

  The CDS / AMP circuit 34 includes a correlated double sampling circuit (CDS) and an amplifier (AMP). The CDS generates R, G, B analog image signals from the imaging signals output from the CCD image sensor 33. The AMP amplifies R, G, B analog image signals generated by the CDS. The A / D converter 35 converts the analog image signal output from the CDS / AMP circuit 34 into image data that is a digital image signal. The digital image data digitally converted by the A / D converter 35 is temporarily stored in the SDRAM 36.

  The image signal processing circuit 37 performs image processing such as gradation conversion, white balance correction, γ correction, YC conversion processing, and distance measurement processing on the image data read from the SDRAM 36. The VRAM 38 temporarily stores image data that has been subjected to various types of image processing by the image signal processing circuit 37 as display image data. The video encoder 39 converts the display image data written in the VRAM 38 or the warning screen data stored in the ROM 26 into a composite signal, and displays a through image or a warning screen on the display panel 20.

  The compression / decompression processing circuit 41 performs predetermined image processing such as a JPEG format on the image data that has been subjected to various types of image processing by the image signal processing circuit 37 when shooting is performed by fully pressing the release button 16. Image compression is applied in the compression format. The compressed image data is stored in the memory card 18 via the media controller 42.

  When the strobe light emitting unit 14 detects a strobe light emission command from the control unit 25, the strobe light emitting unit 14 emits strobe light. This strobe light is applied to the subject to compensate for the subject brightness at the time of shooting.

  The face display pixel extraction unit 45 performs face display pixel extraction processing that extracts a collection of pixels representing the width of a human face from the image data stored in the SDRAM 36 as the number of face display pixels based on the face display pixel determination condition. . This face display pixel determination condition is composed of the color, shape, arrangement, etc. of the face, eyes, nose, and mouth of the person and the face, and is stored in the ROM 26 in advance. The number of face display pixels extracted in the face display pixel extraction process is temporarily stored in the SDRAM 36.

  The determination unit 47 determines which of the face display pixel number and the reference face display pixel number extracted from the image data by the face display pixel extraction unit 45 is smaller. This reference face display pixel number is determined from the diagonal length of the screen of the CCD image sensor 33 of the digital still camera 10, the focal length of the photographing lens 13, and the distance between subjects, and is stored in the ROM 26 in advance.

  Next, a method for calculating the number of reference face display pixels will be described with reference to FIGS. The reference face display pixel number can be obtained by the following three procedures. In the first procedure, the diagonal distance X1 stored in the image data GD1 is calculated using the relational expression of the angle of view. In the second procedure, the distance Z1 per pixel constituting the image data is obtained from the diagonal distance X1. In the third procedure, the reference face display pixel number A0 is obtained from the distance Z1 per pixel and the reference width dimension A1 that is the average value of the face width.

  Details of each of the first to third procedures will be described. First, a first procedure for obtaining the diagonal distance X1 stored in the image data GD1 will be described. As shown in FIG. 4, using a digital still camera 10 having a photographing lens 13 having a focal length F1 and a CCD image sensor 33 having a diagonal line length G1, a subject H1 separated from the photographing lens 13 by a distance Y1 between the subjects. The actual diagonal distance X1 that can be captured and stored in the image data is expressed as tan (θ / 2) = G1 / (2 · F1) from the relational expression of the angle of view. Further, the relationship between the diagonal distance X1, the inter-subject distance Y1, and the angle of view θ is expressed as tan (θ / 2) = X1 / (2 · Y1). From these two equations, an equation A of G1 / (2 · F1) = X1 / (2 · Y1) is derived. The focal length F1 and the screen diagonal length G1 in the formula A are determined by the photographing lens 13 and the CCD image sensor 33. That is, from this formula A, the diagonal distance X1 at the inter-subject distance Y1 can be obtained.

  Next, a second procedure for obtaining the distance Z1 per pixel constituting the image data GD1 from the diagonal distance X1 will be described. In FIG. 4, image data GD1 obtained from the imaging signal generated by the CCD image sensor 33 is shown in FIGS. As shown in FIG. 5, the actual diagonal distance indicated by the image data GD1 and the horizontal distance are X1 and B1, respectively. The diagonal distance X1 can be obtained by using the above-described equation A, and the horizontal distance B1 can be obtained from the diagonal distance X1 and the aspect ratio of the image data GD1. Next, by dividing the horizontal distance B1 stored in the image data GD1 by the number of horizontal pixels B0 (FIG. 6) of the CCD image sensor 33, a distance Z1 per pixel that the image data GD1 constitutes is obtained. Can do.

  Next, a third procedure for obtaining the reference face display pixel number from the distance Z1 per pixel and the average value of the face width will be described. When the reference width dimension A1 representing the average value of the human face width stored in advance in the ROM 26 is divided by the distance Z1 per pixel, the reference face display pixel number A0 representing the average human face width is obtained. be able to. Thus, the reference face display pixel number A0 of the subject H0 at the subject distance Y1 can be obtained by calculation.

  As the inter-subject distance Y1, the first or second farthest distance corresponding to the shooting mode selected by operating the shooting mode selection button 23 or the strobe button 24 is used. The first farthest distance depends on the movable range of the zoom lens 30 and the focus lens 31 in the macro shooting mode of the digital still camera 10, and the second farthest distance is the reach of the strobe light emitted by the strobe light emitting unit 14. Determined by. By using the first or third procedure described above with the first or second farthest distance as the subject distance Y1, the reference face display pixel number at the first or second farthest distance can be obtained. it can. When the macro shooting mode and the flash shooting mode are selected at the same time, the smaller farthest distance of the first and second farthest distances may be set as the inter-subject distance Y1.

  Next, the operation of the digital still camera 10 of the present invention will be described using the flowchart of FIG. First, when shooting a subject with the digital still camera 10, the operation dial 15 is operated to turn on the power of the digital still camera 10 and select a shooting mode.

  Under the photographing mode, subject light formed through the photographing lens 13 is photoelectrically converted by the CCD image sensor 33 into an imaging signal. This imaging signal becomes analog image data via the CDS / AMP circuit 34 and is further converted into digital image data by the A / D converter 35.

  The digitally converted image data is sequentially recorded in the SDRAM 36. The image data recorded in the SDRAM 36 is subjected to various image processing such as gradation conversion, white balance correction, γ correction, and YC conversion processing by the image signal processing circuit 37 and then becomes display image data in the VRAM 38. Stored. The display image data stored in the VRAM 38 is displayed as a through image on the display panel 20 via the video encoder 39. When the release button 16 is pressed halfway in this state, exposure adjustment and focus adjustment are performed, and shooting preparation processing is performed.

  Next, the shooting mode is selected by operating the shooting mode selection button 23 and the strobe button 24. When the macro shooting mode is selected, under the control of the control unit 25, the zoom motor 30a and the focus motor 31a move the zoom lens 30 and the focus lens 31 constituting the shooting lens 13 to positions according to the macro shooting mode. To do. When the strobe shooting mode is selected, the strobe light emitting unit 14 performs predetermined processing in preparation for strobe shooting (step S100). Here, the control unit 25 stores information on the selected shooting mode in the RAM 27.

Further, the control unit 25 reads the shooting mode information stored in the RAM 27, and sets the reference face display pixel number A0 according to the effective shooting mode. When the macro shooting mode is selected, the reference face display pixel number corresponding to the first farthest distance is set as the reference face display pixel number A0. On the other hand, when the flash photography mode is valid, the reference face display pixel number corresponding to the second farthest distance is set as the reference face display pixel number A0. When both the macro shooting mode and the flash shooting mode are enabled, the larger reference face display pixel number of the reference face display pixels corresponding to the first or second farthest distance is referred. The face display pixel number A0 is set (step S110).

  When the release button 16 is fully pressed and the control unit 25 detects the full press operation of the release button 16, one image data GD1 is obtained through a predetermined process. The image data GD1 is temporarily stored in the SDRAM 36. (Step S120). When the strobe shooting mode is valid, the control unit 25 causes the strobe light emitting unit 14 to emit strobe light when detecting that the release button 16 is fully pressed.

  The control unit 25 reads the shooting mode information from the RAM 27, and determines whether either the macro shooting mode or the flash shooting mode is selected (step S130). If the macro photography mode or the flash photography mode is not selected, the operation state of the digital still camera 10 is changed to step S200. If the macro photography mode or the flash photography mode is selected, the operation state is changed to step S140.

  The face display pixel extraction unit 45 reads face display pixel determination conditions from the ROM 26, and performs face display pixel extraction processing on the image data GD1 based on the face display pixel determination conditions. By this face display pixel extraction process, the number of face display pixels representing the width of a human face is obtained. The face display pixel number is temporarily stored in the SDRAM 36 (step S140).

  Next, the determination unit 47 determines whether or not the face display pixel number obtained by the face display pixel extraction process is smaller than the reference face display pixel number A0 (steps S150 and S160). When the determination unit 47 determines that the face display pixel number is larger than the reference face display pixel number A0, the operation state of the digital still camera 10 transitions to step S200. On the other hand, when the determination unit 47 determines that the face display pixel number is smaller than the reference face display pixel number A0, the video encoder 39 displays a warning message for prompting re-shooting under the control of the control unit 25. The information is displayed on the panel 20 (step S170 in FIG. 7).

  This warning message corresponds to the determination condition used in the determination unit 47. Under the control of the control unit 25, the video encoder 39, when the reference face display pixel number A0 based on the first farthest distance is used for this determination process, the first warning message MS1 (FIG. 8), the second farthest When the reference face display pixel number A0 based on the distance is used, a second warning message MS2 (FIG. 9) is displayed on the display panel 20.

  When the control unit 25 detects an operation signal from the buttons 21 and 22 during the display of the first or second warning message MS1 or MS2, the video encoder 39 is displayed on the display panel 20 under the control of the control unit 25. A predetermined selection screen is displayed (step S180). By operating the buttons 21 and 22 while the selection screen is displayed, the photographer selects whether to discard the image data GD1 and perform re-shooting. When the control unit 25 detects a re-photographing permission signal during the selection screen display, the operation state of the digital still camera 10 transitions to step S100 without performing the storage process of the image data GD1. On the other hand, when the control unit 25 detects a rejection signal for re-shooting during the selection screen display, the operation state of the digital still camera 10 transitions to step S200 while holding the image data GD1.

  In step S200, the image data GD1 stored in the SDRAM 36 is subjected to a predetermined image compression process, and the media controller 42 stores the compressed image data GD1 in the memory card 18.

  In the above embodiment, the reference face display pixel number A0 is obtained by calculation. However, the present invention is not limited to this, and the reference face display pixel number A0 may be calculated based on a result of actual shooting. For example, the face display pixel number obtained by subjecting the image data obtained by photographing the subject H1 at the subject distance Y1 as shown in FIG. 4 to the face display pixel extraction process may be set as the reference face display pixel number A0. It is.

  In the above embodiment, the reference face display pixel number A0 is calculated using the average value of the human face width as the reference width dimension A1, but this is not restrictive, and the actual measured dimension of the subject's face width is the reference width dimension A1. As such, the reference face display pixel number A0 may be calculated.

  Although the digital still camera 10 has been described in the above embodiment, the present invention is not limited to this, and the same effect can be obtained by applying the present invention to other imaging devices such as a camera-equipped mobile phone.

It is a perspective view of the front side of the digital still camera of the present invention. It is a perspective view of the back side of the digital still camera of the present invention. It is a block diagram which shows the internal structure of the digital still camera of this invention. Using a digital still camera having an imaging lens with a focal length F1 and a CCD image sensor with a diagonal length G1 on the screen, it can be stored as image data when a subject H1 that is separated from the imaging lens by a distance Y1 between the subjects is imaged. It is explanatory drawing which showed the relationship of diagonal distance X1. FIG. 5 is an explanatory diagram showing image data GD1 obtained by photographing the subject H1 in FIG. 4 and a diagonal distance X1 that can be stored in the image data GD1. FIG. 5 is an explanatory diagram showing image data GD1 obtained by photographing the subject H1 in FIG. 4 and a screen diagonal length G1. 3 is a flowchart of the operation of the digital still camera of the present invention. It is explanatory drawing which shows the state which displayed 1st warning message MS1 on the display panel. It is explanatory drawing which shows the state which displayed 2nd warning message MS2 on the display panel.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Digital still camera 13 Shooting lens 14 Strobe light emission part 15 Operation dial 16 Release button 18 Memory card 20 Display panel 23 Shooting mode selection button 24 Strobe button 25 Control part 30 Zoom lens 31 Focus lens 33 CCD image sensor 39 Video encoder 42 Media controller 45 Face display pixel extraction unit 47 Judgment unit GD1 Image data A0 Reference face display pixel number A1 Reference width dimension F1 Focal length G1 Diagonal length X1 Diagonal distance Y1 Distance between subjects MS1 First warning message MS2 Second warning message

Claims (13)

A shooting mode selection means for selecting a shooting mode from a normal shooting mode for shooting a subject at a normal distance and a macro shooting mode for shooting the subject at a short distance;
Imaging means for photoelectrically converting subject light from the subject obtained through the photographing lens as an imaging signal;
In the imaging apparatus in which the imaging unit generates the imaging signal from the subject light obtained from the imaging lens, and stores the imaging signal as digital image data in a storage medium.
Macro shooting mode detection means for detecting that the shooting mode selection means has selected a macro shooting mode;
Face display pixel extraction means for extracting a collection of pixels indicating a face from the image data as the number of face display pixels;
The farthest distance within the distance range that can be photographed in the macro photographing mode is the first farthest distance, the face display pixel number for the subject at the first farthest distance is the first reference face display pixel number, and the face First determination means for determining which of a display pixel number and the first reference face display pixel number is smaller;
With warning means to warn the photographer about re-taking,
The imaging apparatus according to claim 1, wherein when the first determination unit determines that the face display pixel number is smaller than the first reference face display pixel number, the warning unit is used to issue a first warning. Strobe shooting mode selection means for selecting whether or not to use a strobe shooting mode that emits strobe light to the subject at the time of shooting;
Strobe shooting mode detection means for detecting that the strobe shooting mode selection means selects use of the strobe shooting mode;
The farthest distance within the distance range where the strobe light can reach the subject is a second farthest distance, and the face display pixel number of the subject at the second farthest distance is a second reference face display pixel number, Second determination means for determining whether one of the face display pixel number and the second reference face display pixel number is small;
The said 2nd determination means gives a 2nd warning using the said warning means, when it determines with the said face display pixel number being smaller than the said 2nd reference face display pixel number. Imaging device.   2. The first or second reference face display pixel number determined from the first or second farthest distance, a diagonal length of a screen of the imaging device, and a focal length of the photographing lens. Or the imaging device of 2.   4. The image pickup apparatus according to claim 1, wherein the first and second reference face display pixel numbers are pixel numbers representing a face width of the subject at the first or second farthest distance. 5.   5. The imaging apparatus according to claim 4, wherein the number of first and second reference face display pixels is the number of pixels representing an average value of the width of the face of the subject at the first or second farthest distance. .   The imaging apparatus according to claim 1, wherein the warning unit is an image display apparatus that displays an image.   The imaging apparatus according to claim 6, further comprising display control means for displaying a message prompting re-taking on the image display apparatus as the first or second warning. A flash shooting mode selection means for selecting whether or not to use a flash shooting mode in which a flash light is emitted to a subject during shooting;
Imaging means for photoelectrically converting subject light from the subject obtained through the photographing lens as an imaging signal;
In the imaging apparatus in which the imaging unit generates the imaging signal from the subject light obtained from the imaging lens, and stores the imaging signal as digital image data in a storage medium.
Strobe shooting mode detection means for detecting that the strobe shooting mode selection means has selected the use of the strobe shooting mode, and face display for extracting a set of pixels indicating the face from the image data as the number of face display pixels Pixel extraction means;
The farthest distance within the distance range where the strobe light can reach the subject is the second farthest distance, and the face display pixel number for the subject at the second farthest distance is the second reference face display pixel number, Second determination means for determining whether one of the face display pixel number and the second reference face display pixel number is small;
With warning means to warn the photographer about re-taking,
2. The imaging apparatus according to claim 1, wherein when the second determination unit determines that the face display pixel number is smaller than the second reference face display pixel number, the warning unit is used to issue a second warning.   9. The imaging apparatus according to claim 8, wherein the second reference face display pixel number determined from the second farthest distance, a screen diagonal length of the imaging apparatus, and a focal length of the photographing lens is used.   10. The image pickup apparatus according to claim 8, wherein the second reference face display pixel number is a pixel number representing a face width of the subject at the second farthest distance. 11.   11. The imaging apparatus according to claim 10, wherein the second reference face display pixel number is a pixel number representing an average value of the face width of the subject at the second farthest distance.   The imaging device according to claim 8, wherein the warning unit is an image display device that displays an image. The image pickup apparatus according to claim 12, further comprising display control means for causing the image display device to display a message prompting reshooting as the second warning.

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