JP5374906B2 - projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projector for projecting a projection image without a screen, a wall or the like. <P>SOLUTION: This projector includes: a projecting part 14 for projecting a projection image; an imaging part 16 for imaging object light; a projection area detecting part 32 for detecting an area on which the projecting part projects an image based on the pick-up image obtained by the imaging part; and a projection control part 26 for changing the projection position and the projection size of the projection image by the projecting part to project the projection image in the projection area detected by the projection area detecting part. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a portable projector.

Small and portable projectors are known. In such a projector, a user projects a projected image on a projection surface such as a screen or a wall while holding the projector by hand (see, for example, Patent Document 1).
JP 2005-326557 A

  However, the projector described above requires a place for projecting a projected image such as a screen or a wall. When the projector is carried and used outdoors, the projected image is projected if there is no screen or wall. I can't. In addition, it may be possible to provide a liquid crystal panel or the like separately from the projection unit in case there is no place for projecting a projection image such as a screen or a wall. In this case, however, the cost increases and the size of the apparatus increases. Problems arise.

  An object of the present invention is to provide a projector capable of projecting a projected image even when there is no screen or wall.

The projector according to the present invention includes a projection unit that projects a projection image, an imaging unit that captures subject light, and a palm as a projectable region of the projection image by the projection unit based on the captured image captured by the imaging unit. A projectable area detecting unit for detecting the projection image, and changing a projection position and a projection size of the projection image by the projecting unit to project the projection image on the palm detected by the projectable area detecting unit, and Based on the color of the palm detected by the projectable area detection unit, the projected image is subjected to color balance correction that weakens yellow to red and increases blue, and the tilt of the palm detected by the projectable area detection unit And a projection control unit that performs keystone correction on the projection image based on whether the palm is the left or right hand, and the projection unit The projection of the projection image begins when the palm is detected by the projection region detection unit, the projected image when the palm be closed the hand becomes undetectable by the projection area detection section The projection is terminated.

  According to the projector of the present invention, it is possible to project a projection image even when it is small and portable and has no screen or wall.

  A projector according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram illustrating an appearance of a projector according to an embodiment. The projector 2 has a small rectangular parallelepiped shape, includes a projector projection window 4 and a photographing lens 6 at the upper part of the front surface, a power switch 8 on the side surface, and a multi selector (not shown) for selecting a projected image on the rear surface. It has been.

  FIG. 2 is a block diagram showing a system configuration of the projector according to the embodiment. The projector 2 includes a CPU 10. The CPU 10 stores a power switch 8, an operation unit 12 including a multi-selector, a projection unit 14 that projects a projection image, an imaging unit 16 that captures a projection area by the projection unit, and projection image data. A memory card 18 is connected.

  The projection unit 14 includes a power source control unit 22 that turns on and off the LED 20 that is a light source, an LCOS (reflection type liquid crystal element) 24 that reads out image data of the projection image from the memory card 18 and displays the projection image, and a projectable region described later. A projection image processing unit 26 that performs predetermined processing on the projection image based on the projectable region detected by the detection unit 32 is provided. In addition, the imaging unit 16 outputs the image of the subject light through the imaging lens 6 and is output from the imaging element 28 and the imaging element 28 configured by a CCD or a CMOS that generates an imaging signal (analog signal as accumulated charge). Based on the captured image, an image data storage unit 30 that generates an image data of an image captured by A / D converting the captured image signal in an A / D conversion unit (not shown), and temporarily stores the image data. A projectable area detection unit 32 that detects a projectable area in which an image can be projected by the projection unit 14 is provided.

  FIG. 3 is a diagram illustrating a configuration of the projection unit according to the embodiment. The projection unit 14 is an LED 20 that is a light source for image projection, a condensing lens 36 for making the light emitted from the LED 20 substantially parallel, and separates the incident light into P-polarized component light and S-polarized component light. A polarizing beam splitter 38, an LCOS 24 for displaying a projection image, and a projection lens 40 for projecting a projection image. Note that the left surface 38a of the polarization beam splitter 38 in FIG.

  In the projection unit 14, the light emitted from the LED 20 is converted into substantially parallel light by the condenser lens 36, and the light that has been converted into substantially parallel light is incident on the polarization beam splitter 38. Of the light incident on the polarizing beam splitter 38, the S-polarized component light is reflected to the left in FIG. 3 and travels toward the non-reflecting surface 38a of the polarizing beam splitter 38, while the P-polarized component light is The light passes through the polarization beam splitter 38. The P-polarized component light transmitted through the polarization beam splitter 38 enters the LCOS 24. The P-polarized component light incident on the LCOS 24 travels through the liquid crystal layer of the LCOS 24 and is reflected by a reflection film (not shown), and then travels in the reverse direction through the liquid crystal layer of the LCOS 24 and is emitted from the LCOS 24. The light emitted from the LCOS 24 is incident on the polarization beam splitter 38 again. When a voltage is applied to the liquid crystal layer of the LCOS 24, the LCOS 24 functions as a phase plate, and converts P-polarized component light into S-polarized component light. Therefore, the light incident on the polarization beam splitter 38 again is a mixed light of the S polarization component and the P polarization component. The polarization beam splitter 38 reflects only the S-polarized light component of the re-incident light at the polarization separation unit, and the reflected S-polarized light component is reflected from the projector projection window 4 through the projection lens 40 to the projector 2. Projected forward. That is, the image displayed on the LCOS 24 is read out as a projected image and projected onto the projectable area in front of the projector 2.

  Next, processing of the projector according to the embodiment will be described with reference to the flowchart shown in FIG. As described above, the projector 2 has a small rectangular parallelepiped shape, and the projector projection window 4 and the photographing lens 6 are provided on the upper part of the front surface. Therefore, as shown in FIG. When the projector 2 is inserted, the projector projection window 4 and the photographing lens 6 are exposed to the outside from the breast pocket. In such a state, when the main power source of the projector 2 is turned on by the power switch 8, the projector 2 images the subject light in the projection MAX area 42 shown in FIG. The projector enters a standby state for waiting for projection (step S2). Here, the projection MAX area 42 is an area including the maximum area in which a projection image can be projected by the projection unit 14 of the projector 2. Captured image data of an image based on subject light captured by the image sensor 28 of the imaging unit 16 is temporarily stored in the image data storage unit 30. The projectable area detection unit 32 detects whether or not a palm that is a projectable area exists within a predetermined distance from the projector 2 based on the captured image data stored in the image data storage unit 30. If it cannot be detected (step S3), the process returns to the standby state and continues to image the projection MAX area 42 (step S2).

  On the other hand, the projectable area detection unit 32 detects that a palm that is a projectable area exists within a predetermined distance from the projector 2 based on the captured image data stored in the image data storage unit 30. If so (step S3), the palm shape, position, size, color, and tilt are recognized based on the captured image data (step S4).

  The projection image processing unit 26 of the projection unit 14 projects the projection image so that the image displayed on the LCOS 24 is appropriately projected on the palm by the projection unit 14 based on the recognized palm shape, position, and size. The display size is changed and the display position is changed (step S5). Also, based on the recognized palm color, the color balance of the image is corrected so that the image can be displayed in an appropriate color on the palm. I do. For example, since the color of the palm is slightly strong from yellow to red, color balance correction is performed to weaken red to yellow and slightly increase blue (step S6). Further, it is estimated from the outer shape of the hand whether the palm is facing the chest or tilted (step S7), and if it is determined that the palm is tilted, keystone correction is performed (step S8). Then, the projection image that has been subjected to the predetermined processing by the projection image processing unit 26 is displayed on the LCOS 24, and the projection image is read out by the light emitted from the LED 20, and through the projection lens 40 as shown in FIG. Projection is projected from the projector projection window 4 onto the palm (step S9). In this case, the focal length of the projection lens 40 is also changed as necessary. Here, during the projection of the projected image, when movement such as palm movement or change in tilt amount is detected by the projectable area detection unit 32 from the image captured by the imaging unit 16 (step S10), the image data Based on the image data of the projection MAX area 42 stored in the storage unit 30, it is detected whether or not a palm that is a projectable area exists within a predetermined distance from the projector 2 (step S11). If a palm is detected in step S11, the projection unit 14 continues to project the projected image, and the process returns to step S4 to recognize the palm shape, position, size, color, and inclination again. The processes shown in steps S5 to S9 are repeated. That is, the display position / display size and color balance of the projection image projected on the palm are adjusted, and if the palm is tilted, trapezoidal correction is further performed to continue projecting the image.

  On the other hand, in step S10, based on the image data picked up by the image pickup unit 16, when the movement of the palm is not detected by the projectable area detection unit 32, the projection image displayed on the LCOS 24 is adjusted or corrected. The projection of the image is continued (step S9).

  In step S11, when the palm cannot be detected by the projectable area detection unit 32 based on the image data captured by the imaging unit 16, the projection unit 14 ends the projection of the projection image ( Step S12).

  According to the projector according to the present embodiment, it is possible to project a projection image even when there is no screen or wall, and it is not necessary to hold it in the hand when projecting the projection image, thereby preventing the occurrence of camera shake. be able to. In addition, the projection of the image is started when the projectable area is detected, the projection of the image is stopped when the projectable area is not detected, and the projection image is adjusted according to the movement of the palm that is the projectable area. Alternatively, since the correction is performed, it is possible to reduce the effort for the user to start and stop the projection, and to adjust the projection image or to instruct the correction.

  In the above-described embodiment, when it is estimated that the palm is tilted in step S7, it is determined whether the hand is a right hand or a left hand from the shape of the palm in step S8, and the determination result is reflected in the keystone correction. You may let them. That is, in the case of the left hand, the thumb side is closer to the body and the little finger side is more distant, and the right hand is the opposite, so it is determined whether the hand is the right hand or the left hand, and the lateral direction The keystone correction can be applied. In addition, the palm tilt amount may be estimated from the image captured by the image capturing unit 16 and reflected in the correction amount in the trapezoidal correction.

  In the above-described embodiment, an image of the palm of the user may be registered in advance and used for individual authentication. In this case, when the projection area detection unit recognizes the palm, individual authentication is performed based on characteristics such as shape, color, and palm. When it is recognized that the user's palm is registered in advance, the projection image is projected onto the palm. In this case, color balance correction of the projected image according to the registered palm may be performed.

  Further, in the above-described embodiment, when the projectable area detection unit detects that the palm is opened, projection is started, and it is detected that the palm is not opened, such as a closed hand. Sometimes the projection may end.

  In the above-described embodiment, the chest pocket mounting type in which the projector is inserted into the breast pocket has been described. However, the pendant type shown in FIG. 7 or the head mount type shown in FIG. These projectors are also small and portable, and can project projected images even when there is no screen or wall, so that when projecting projected images, they do not need to be held in the hands and prevent camera shake. be able to.

  In the above-described embodiment, the palm is described as an example of the projectable area, but a screen, a wall, or the like may be used. Although the light source is LED and the display unit is LCOS, the light source is laser, the display unit is composed of a micro mirror, and the micro electro-mechanical is a MEMS that moves the micro mirror at high speed using the electrostatic effect. In addition, DLP (registered trademark) in which mirrors that can be independently driven are spread on a CMOS semiconductor may be used for the display unit.

  Further, as shown in FIG. 9, the projector according to the present embodiment may be provided in a mobile phone. In this case, it is possible to project a projected image during a call. That is, by arranging the projector projection window 46 and the photographing lens 48 on the lower surface of the mobile phone 44, a projected image is projected from the projection window 46 onto a projection surface such as a palm or a desk during a call. Note that paper having a specific shape or color, such as paper placed on a desk, may be detected as a projectable region.

  Further, a specific small screen may be attached to the projector, and the small screen may be held by hand or attached to a wall. In this case, the projectable area detection unit stores the shape and color of the small screen in advance, and starts projecting the image when the small screen is detected.

1 is a diagram showing an external appearance of a projector according to an embodiment of the present invention. 1 is a block diagram showing a system configuration of a projector according to an embodiment of the present invention. It is a figure which shows the structure of the projection part which concerns on embodiment of this invention. It is a flowchart which shows the process of the projector which concerns on embodiment of this invention. It is a figure which shows the use condition of the projector which concerns on embodiment of this invention. It is a figure which shows the use condition of the projector which concerns on embodiment of this invention. It is a figure which shows the use condition of the projector which concerns on embodiment of this invention. It is a figure which shows the use condition of the projector which concerns on embodiment of this invention. It is a figure which shows the use condition of the projector which concerns on embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 2 ... Projector, 4 ... Projector projection window, 6 ... Shooting lens, 10 ... CPU, 14 ... Projection part, 16 ... Imaging part, 20 ... LED, 24 ... LCOS, 28 ... Imaging element, 32 ... Projection possible area detection 38, a polarizing beam splitter, 40, a projection lens, 42, a projection MAX region.

Claims (2)

A projection unit for projecting a projection image;
An imaging unit for imaging subject light;
A projectable region detection unit that detects a palm as a projectable region of the projection image by the projection unit based on a captured image captured by the imaging unit;
In order to project the projection image on the palm detected by the projectable area detection unit, the projection position and the projection size of the projection image by the projection unit are changed, and the projection area detection unit detects the projection image Based on the color of the palm, the projected image is subjected to a color balance correction that weakens yellow to red and strengthens blue. And a projection control unit that performs keystone correction on the projection image,
The projection unit starts projecting the projection image when the palm is detected by the projectable region detection unit, the hand is closed by the projectable region detection unit , and the palm becomes undetectable. A projector that terminates the projection of the projected image in the event of failure.   The projector according to claim 1, further comprising an individual authentication unit that performs individual authentication based on the characteristics of the palm detected by the projectable area detection unit.

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