JP2005300638A - Projector and photographing system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a photographing system that ensures an image of optimum density whether the image is a person or a background, by providing and using a projector capable of projecting the background with a sufficient quantity of light at a time of photographing. <P>SOLUTION: The photographing system includes: the projector having a light bulb and a strobe as light sources; and an illumination means having a light bulb and a strobe as light sources; a photographing means for photographing a person; and a control means for performing control for setting the photographing conditions of the photographing means by projecting the background by the use of the light bulb of the projector and illuminating the person by the use of the light bulb of the illumination means, and for performing the control of the operation of the projector in synchronous with the photographing means photographing the person while illuminating the person by the use of the strobe of the illumination means. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a projector that magnifies and projects a film image, a liquid crystal image, and the like on a screen, and a photographing system that performs photographing on the background of an image on the screen projected by the projector.

  In person photography performed in a studio, it is necessary to select a screen as a background so as to suit the purpose of photography as well as selection of props such as costumes and chairs to suit the purpose of photography.

  For the background screen, large-format paper or cloth having a color tone and pattern suitable for the shooting purpose is adopted, but recently, instead of preparing multiple types of screen, it is plain, white, or light color In many cases, a predetermined color, pattern, and image are projected onto a screen by a projector (referred to as a projector), and the screen on which these are projected is used as a background. The projection onto the screen may be performed from the front side, or may be performed from the back side onto the translucent screen.

  As an application of such a technique, an image of a landscape, for example, an image of a coast, a mountain, a sunset, a group of urban buildings, a famous tourist spot, etc. is projected on the screen behind the person, and the person appears as a background image. There is also a proposal of a photo vending machine for the purpose of obtaining a photograph taken at a place (see, for example, Patent Document 1).

  In general, for human photography, both light from a light bulb (referred to as a lamp) and light from a strobe are used, but the strobe is dominant as a light source that contributes to photographing because of the difference in the amount of light. Under these conditions, when a person is photographed against the background of the screen described above, a strobe light having a light quantity suitable for the person is also emitted to the screen. The image has a low difference (dynamic range).

In other words, the density difference of the image projected on the screen is proportional to the intensity of the light source and the density difference of the projected document image, but the light quantity due to the instantaneous flash emission of the strobe and the lamp corresponding to that time. This phenomenon is caused by a large difference in the amount of light.
JP 2002-320178 A (page 1-2)

The present invention has been made to solve the above-described disadvantages. An object of the present invention is to provide a projector capable of projecting a background with a sufficient amount of light at the time of shooting, and by using this projector, a human image can be projected. Another object of the present invention is to provide a photographing system that can obtain an image having an optimum density for both background images.

The above-mentioned subject is achieved by realization of the following devices and systems.
(1) A projector having a light bulb and a strobe as a light source.
(2) a projector having a light bulb and a strobe as a light source;
Illumination means including a light bulb and a strobe as a light source;
Photographing means for photographing a person;
Control for projecting a background with the light bulb of the projector, irradiating a person with the light bulb of the illuminating means to set the photographing conditions of the photographing means, and the photographing performed while irradiating the person with a strobe of the illuminating means And a control means for controlling the operation of the projector in synchronism with the person photographing by the means.

  According to the first aspect of the present invention, a light source capable of projecting a bright projection image with a wide dynamic range that can support photographing using a strobe that is short-time exposure, and a light source for obtaining a projection image having a predetermined brightness for a certain period of time. By switching the light source suitable for the purpose of use of the projector, a projection image with a predetermined dynamic range can be obtained, and heat generation of the light source can be suppressed.

  According to the invention of claim 2, preparations required before photographing, for example, the pose of a person, the position of props, exposure conditions, etc., take a sufficient amount of time against the background of an image created by a projector using a light bulb as a light source. At the time of shooting, a background image is projected with a sufficient amount of light by a strobe light source, and the background image is also shot under appropriate conditions.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a diagram schematically showing the structure of a projector according to the present invention. The projector shown in the figure is a projector using a liquid crystal. However, in the case of a projector that projects an image of a reversal film that has been widely used in the past, it can be similarly applied to the light source unit related to the present invention, and color separation is performed. Therefore, the optical system is simpler than that of the liquid crystal method, so that the description in this case is omitted.

  The projector includes a halogen lamp HL as a first light source, a background strobe ST1 as a second light source, condenser lenses L1 and L2 for condensing light from the light source, mirrors M1, M2, M3, M4, M5, and M6. , Liquid crystal panels B, G, R, prism P, projection lens L3, and the like.

  The halogen lamp HL is a known electric component having a reflecting surface (cold mirror) that reflects visible light and transmits a long wavelength that is not related to image projection.

  The condensing lens L1 condenses the light emitted in each direction from the halogen lamp HL so that each surface of the liquid crystal panels B, G, and R is efficiently and uniformly irradiated.

  Mirrors M1 to M6 are formed by forming a metal thin film on the glass surface by vapor deposition, and are called dichroic mirrors, which are mirrors that separate transmitted light and reflected light according to wavelength according to the thickness and layer structure of the thin film. It is a known optical component. In this embodiment, M1 reflects light in the visible wavelength range, M2 transmits light in the blue wavelength range, and reflects light in the red and green wavelength ranges, and M3 is in the visible wavelength range. M4 reflects light in the red wavelength range and reflects light in the green wavelength range, and M5 and M6 are mirrors that reflect the entire visible range.

  The liquid crystal panels B, G, and R are panels formed of a transmissive liquid crystal surface that is sent from a computer and displays image information separated into three colors of blue, green, and red in monochrome. For example, the liquid crystal panel B displays only the blue image constituting the original image in monochrome on the panel surface, and the displayed image is illuminated with blue light, whereby the blue image is displayed on the screen. .

  The prism P is a known optical component for collecting blue, green, and red light coming from three directions in one direction.

  The projection lens L3 is an optical component that projects the images of the liquid crystal panels B, G, and R onto the screen.

  The background strobe ST1 is controlled to emit light in synchronism with the shutter of the photographing means, and is the same as in the case of the halogen lamp HL by the mirror M1 that has been moved to the dotted line in the figure before the strobe light is emitted. The image is projected on the screen through a simple optical path. The projection time of the image is the flash emission time, which is extremely short. However, in synchronization with this time, the shutter of the photographing means is released and photographing is performed. By using a strobe light source, a background with a sufficient dynamic range is projected, and much less power is required than when a background with a similar dynamic range is realized with a halogen lamp. This saves power and reduces heat generation of the light source.

  FIG. 2 is a conceptual diagram of the photographing system.

  The background image is projected by the projector 1 onto the screen SC placed behind the person. Usually, a projector is installed at a position not affected by a person during projection, for example, above or next to the person.

  In addition to the main photographing strobe ST2, a plurality of lamps (not shown) and a strobe (not shown) are provided as illumination means for photographing. Lamps other than strobes are used as illumination means used for preparation before shooting, for example, for setting shooting conditions.

  FIG. 3 is a block diagram showing the control relationship of the photographing system according to the present invention. In the drawing, the description of blocks not directly related to the present invention is omitted.

  The photographing means 2 is a digital camera. When the shutter of the camera is pressed, a shooting start signal is sent to the control means 5. Based on the shooting start signal, the control means 5 first sends a shooting preparation signal to the projector control means 10, and then receives a preparation completion signal from the projector control means 10 and then sends it to the shooting strobe control means 31. A signal for instructing the light emission of the photographing strobe ST2 and a signal for instructing the light emission of the background strobe ST1 are output to the projector control means 10, and two types of strobe light are emitted simultaneously. Note that the shutter of the digital camera is set in advance so that the shutter is released in accordance with the flash emission.

  Image information obtained by photographing is transferred to the control means 5.

  The projector 1 projects an image as a background on a screen by a halogen lamp HL that is a lamp for a light source except during shooting when the shutter is released. The projector control means 10 performs the operation control of the projector 1 and the data processing related to the projection image. When receiving the imaging start signal from the control means 5, the projector control means 10 controls the mirror M1 moving means 13 so that the mirror M1 is shown. It is moved to the position indicated by the dotted line 1. When the movement is completed, the mirror M1 moving means 13 sends a movement completion signal to the control means 5 via the projector control means 10 and waits for a signal that instructs the background strobe ST1 to emit light.

  The illumination unit 3 includes a shooting strobe ST2, a shooting strobe control unit 31, an illumination lamp LP, and an illumination lamp control unit 32 that performs dimming control.

  The operation display means 4 comprises a display such as a CRT or LCD, a keyboard, a remote control switch, and the like, and is a means for setting various conditions to the control means 5, confirming a photographed image, and operating instructions related to photographing.

  The control unit 5 is a computer system having a CPU, a memory, an input / output interface, and the like, and controls operations of the photographing unit 2, the photographing strobe, and the projector 1. Note that a program for control and a table to be referred to at the time of shooting, for example, a table in which conditions such as shutter speed, light emission amount, operation timing of each means are set are stored in the memory in advance.

  FIG. 4 is a flowchart showing an operation flow of the photographing system according to the present invention.

  When the photographer presses the shutter of the photographing means 2, a photographing start signal is sent from the photographing means 2 to the control means 5 (step S1). Upon receiving the shooting start signal, the control means 5 sends a shooting preparation signal for prompting preparation for shooting to the projector control means 10 (step S2). Receiving the photographing preparation signal, the projector control means 10 issues a movement instruction signal to the mirror moving means 13 (step S3). When the movement completion signal is received (step S4: Y), the photographing preparation completion signal is controlled. 5 (step S5).

  Recognizing that the preparation for photographing has been completed, the control means 5 provides the projector control means 10 with a shutter operation signal for the photographing means 2 and a signal for instructing light emission of the photographing strobe ST2 to the photographing strobe control means 31. Sends a signal to instruct the background strobe ST1 to emit light (step S6).

  The above three types of signals are output sequentially or simultaneously with reference to a preset operation timing setting table.

  When the shutter of the photographing means 2 is closed (step S7: Y), a photographing end signal is sent from the photographing means 2 to the control means 5 (step S8), and the control means 5 transfers the photographing end signal to the projector control means 10. (Step S9).

  Upon receiving the end signal, the projector control means 10 issues a movement instruction signal to the mirror M1 moving means 13 to return the mirror M1 to the position indicated by the solid line in FIG. 1, and from the position sensor (not shown) that the return is completed. After confirming with the signal, a return signal is sent to the control means 5.

  Receiving the return signal, the control means 5 displays on the operation display means 4 an image or text indicating that the next shooting or new work is possible (step S10).

  As described above, with the system described above, it is possible to obtain a high-quality image of both the person and the background.

It is a figure which shows the structure of a projector typically. It is a conceptual diagram of an imaging system. It is a block diagram which shows the control relationship of an imaging | photography system. It is a flowchart which shows the flow of operation | movement of an imaging | photography system.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Projector 2 Imaging | photography means 3 Illumination means 4 Operation display means 5 Control means 10 Projector control means 13 Mirror moving means B Liquid crystal panel G Liquid crystal panel R Liquid crystal panel M1-6 Mirror HL Halogen lamp LP Illumination lamp SC Screen ST1 Background strobe ST2 Photographing Strobe

Claims (2)

A projector comprising a light source and a light bulb and a strobe. A projector having a light bulb and a strobe as a light source;
Illumination means including a light bulb and a strobe as a light source;
Photographing means for photographing a person;
Control for projecting a background with the light bulb of the projector, irradiating a person with the light bulb of the illuminating means to set the photographing conditions of the photographing means, and the photographing performed while irradiating the person with a strobe of the illuminating means And a control means for controlling the operation of the projector in synchronism with the person photographing by the means.

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