JP2008242312A - Document and picture projection device, document and picture projecting method, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To avoid giving an unpleasant impression to a person who view a projected image by limiting projection of unnecessary images, as much as possible. <P>SOLUTION: The document and picture projection device comprises photography systems (39 to 41, and 36) which acquire image information on a document/picture table 12, projection systems (14, and 24 to 33) which form and project a light image based upon the acquired image information, and a control unit 34 which decides that a document or picture is placed not in a stationary state from the image information obtained by the photography systems (39 to 41, and 36) and temporarily stops the projection of the image information, obtained by the photography systems (39 to 41, and 36), by the projection systems (13, and 24 to 33) according to the decision result. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a document projection apparatus, a document projection method, and a program for projecting images of various documents placed on a document table.

Conventionally, a system in which a document camera device is connected to a projector device and a document image photographed by the document camera device is projected by the projector device has been generally used. (For example, Patent Document 1)
JP 2005-143091 A

  In general, the document camera including the technique of Patent Document 1 captures an image on the document table in real time and outputs the image signal. Therefore, not only when a document is placed on the document table, but also when the document is being replaced on the document table and when no document is placed on the document table. Is output in real time. Therefore, in addition to the original document image to be projected, an unsightly image, an unsightly image, and an image that does not need to be seen are projected together.

  The present invention has been made in view of the above circumstances, and its purpose is to limit the projection of unnecessary images and to give an unpleasant impression to the viewer of the projected image. It is an object of the present invention to provide a document projection apparatus, a document projection method, and a program that can be avoided as much as possible.

  The invention described in claim 1 is an image acquisition unit that acquires image information of a document table on which a document is placed, a projection unit that forms and projects an optical image based on the image information obtained by the image acquisition unit, Judgment means for judging a state in which a document is not statically placed on the document table from image information obtained by the image acquisition means, and the image acquisition by the projection means corresponding to the determination result of the determination means Projection control means for temporarily stopping projection of image information obtained by the means.

  According to a second aspect of the present invention, in the first aspect of the invention, the determination unit determines a state in which no document is placed on the document table based on a contrast value of image information obtained by the image acquisition unit. It is characterized by that.

  According to a third aspect of the present invention, the image processing device according to the first aspect further comprises image storage means for storing image information in place of a document image in advance, and the projection control means is an image obtained by the image acquisition means. When the information projection is temporarily stopped, the image information stored in the image storage unit is projected by the projection unit.

  The invention according to claim 4 is the invention according to claim 3, wherein the image storage means stores a plurality of pieces of image information, and a selection means for selecting one of the plurality of images stored in the image storage means. Further, the projection control means reads out the image information selected by the selection means from the image storage means and causes the projection means to project when the projection of the image information obtained by the image acquisition means is temporarily stopped. Features.

  According to a fifth aspect of the present invention, there is provided an image acquisition unit that acquires image information of a document table on which a document is placed, and a projection unit that forms and projects an optical image based on the image information obtained by the image acquisition unit. A document projection method in a document projection apparatus provided with a determination step of determining a state in which a document is not stationary and placed on the document table from image information obtained by the image acquisition unit, and in this determination step And a projection control step of temporarily stopping projection of the image information obtained by the image acquisition unit by the projection unit.

  According to a sixth aspect of the present invention, there is provided an image acquisition unit that acquires image information of a document table on which a document is placed, and a projection unit that forms and projects an optical image based on the image information acquired by the image acquisition unit. A program executed by a computer incorporated in the document projection apparatus provided, and a determination step of determining a state in which the document is not statically placed on the document table from the image information obtained by the image acquisition unit; Corresponding to the determination result in the determination step, the computer causes the computer to execute a projection control step of temporarily stopping projection of the image information obtained by the image acquisition unit by the projection unit.

  According to the present invention, since the projection of the image on the document table is temporarily stopped in a state where the document is not placed stationary on the document table, the projection of unnecessary images is limited, It is possible to avoid giving an unpleasant impression on the side of viewing the projected image as much as possible.

  Hereinafter, an embodiment in which the present invention is applied to a projector apparatus having a document camera function will be described with reference to the drawings.

  FIG. 1 shows an external configuration of the projector apparatus 10 according to the present invention as viewed from the oblique upper side including the front surface. The projector apparatus 10 has a substantially rectangular parallelepiped main body casing 11 whose upper surface is a glass-made document table 12, and various document materials to be projected are faced down so that the surface to be projected is on the lower side. 12 is mounted.

  FIG. 1 shows a state in which a cover (not shown) that is detachably attached to the upper surface of the main body casing 11 of the projector device 10 is removed. The document camera function is not used or the power is turned off. When in use or the like, the pair of legs provided on the cover is inserted and mounted by the two cover mounting parts 13 and 13 so that the cover can be opened and closed in the same manner as a general copier or flatbed scanner. Can be attached.

  A projection lens 14 is disposed on the front face and lower left side of the main casing 11. In addition, a pair of leg portions 15 are provided at the left and right lower ends of the front surface of the main body casing 11. The lengths of the leg portions 15 and 15 can be adjusted by manually rotating, and the installation angle of the projector device 10 can be changed. A fixed leg portion is disposed in the center of the bottom surface of the main body casing 11 (not shown) near the back surface, and the projector device 10 is supported at three points together with the leg portions 15 and 15.

  Further, an Ir light receiving unit 16 that receives an Ir (infrared) signal from a remote controller of the projector device 10 (not shown) is disposed on the front surface of the main casing 11. An Ir light receiving unit similar to the Ir light receiving unit 16 is also disposed on the back side of the main body casing 11 (not shown), and the user of the projector device 10 operates the remote controller from any direction toward the projector device 10. Even so, the operation signal can be reliably received.

  Further, although not shown, various input / output connector portions for connecting cables to external devices for inputting image signals, such as personal computers and video movie cameras, are provided on the back side of the main casing 11. .

  Further, on the right side surface of the main casing 11, a key switch portion 17 is provided so that the projector device 10 can be directly operated without using the above-described remote controller.

  Examples of the key switch unit 17 include a power key, an AFK (Automatic Focus / Automatic Keystone correction) key, a zoom key, an input selection key, a “Mode” key, a cursor (“↑”, “ ↓ ”,“ ← ”,“ → ”) key,“ Enter ”key,“ Cancel ”key, and the like. It is assumed that similar keys are also provided in the remote controller of the projector apparatus 10 described above.

Next, the configuration of the electronic circuit of the projector apparatus 10 will be described with reference to FIG.
In the figure, in an external input mode for projecting an externally input image, various standard image signals input from the input / output connector unit 21 are transmitted via the input / output interface (I / F) 22 and the system bus SB. After being unified into an image signal of a predetermined format by the image conversion unit 23, it is sent to the projection control unit 24.

  The projection control unit 24 develops and stores the transmitted image signal in the video RAM 25 and then generates a video signal from the stored contents of the video RAM 25. The projection control unit 24 multiplies the frame rate of the video signal, for example, 60 [frames / second], the number of color component divisions, and the number of display gradations, and performs a spatial light modulation element (SOM) by faster time division driving. For example, the micromirror element 26 is driven to display.

  On the other hand, the light source lamp 28 that is disposed in the reflector 27 using, for example, an ultra-high pressure mercury lamp emits white light with high luminance. The white light emitted from the light source lamp 28 is colored into a primary color in a time-sharing manner through the color wheel 29, converted into a luminous flux having a uniform luminance distribution by the integrator 30, and then totally reflected by the mirror 31 to the micromirror element 26. Irradiated. Thus, an optical image is formed by the reflected light from the micromirror element 26, and the formed optical image is projected and displayed on the screen (not shown) to be projected through the projection lens 14.

  The projection lens 14 enlarges the optical image formed by the micromirror element 26 and projects it onto a target such as a screen, and the focus position and the zoom position (projection angle of view) can be arbitrarily changed.

  However, the projection light processing unit 33 executes the lighting driving of the light source lamp 28 and the rotation driving of the motor (M) 32 that rotates the color wheel 29.

  The controller 34 controls all the operations of the above circuits. The control unit 34 includes a CPU, a work memory, and the like, and executes a control operation using an operation program, various fixed data, and the like that are fixedly stored in a program memory 35 that is a nonvolatile memory.

  Further, a document photographing unit 36, a document storing unit 37, and an audio processing unit 38 are connected to the control unit 34 via the system bus SB.

  In the document input mode, not in the external input mode from the main body casing 11, the document photographing unit 36 drives the light source lamp 39 to emit light and irradiates the document table 12 from the inside of the main body casing 11 over the entire surface.

  When white light from a light source lamp 39 formed of, for example, an LED lamp array is irradiated on a document placed on the document table 12, the image of the document is reflected on the CCD 41, which is an area image sensor, via the photographing lens 40 by the reflected light. Information is acquired by being incident and imaged. Specifically, the photoelectric output of the CCD 41 is digitized by the document photographing unit 36, and pre-processing such as pixel interpolation processing, γ correction processing, and white balance processing is executed, thereby the document placed on the document table 12 described above. The acquired image data is stored in the document storage unit 37.

  The document storage unit 37 has a capacity for storing image data of at least two documents in addition to image data for user setting when there is no subject to be described later, and an output image in a document input mode to be described later. It is used for switching control and the like.

  The sound processing unit 38 includes a sound source circuit such as a PCM sound source, converts the sound data given during the projection operation into an analog signal, and drives a speaker 42 provided on, for example, the back surface of the main body casing 11 of the projector device 10 to emit sound. Or, a beep sound or the like is generated if necessary.

An operation signal corresponding to a user's key operation is directly input to the control unit 34 from the key switch unit 17 and the Ir light receiving unit 43.
The Ir light receiving unit 43 includes the Ir light receiving unit 16 provided on the front surface of the main body casing 11 and an Ir (infrared) light receiving unit provided on the back surface, and demodulates an infrared light modulation signal from a remote controller (not shown). It is converted into a code signal and sent to the control unit 34.

Next, the operation of the above embodiment will be described.
FIG. 3 shows the processing contents in the document input mode executed by the control unit 34 based on the operation program read from the program memory 35 immediately after the power is turned on. At the beginning, it is determined whether or not to set a projection state when there is no subject, that is, a state where a document as a subject is not placed on the document table 12 (step S01).

This is the case in the projected image immediately after power-on, for example
“Do you want to set the image when there is no subject?
YES → Enter / NO → Cancel ”
A guide message for prompting the selection is projected, and the determination is made based on the contents of the keys operated thereafter.

  Here, the default value of the projector device 10 is set to use standby image data stored together with the operation memory in the program memory 35, and in particular, black or blue without any projection. It is assumed that a setting for projecting only the blank image and a setting for reading and projecting an image stored in advance in the document storage unit 37 by the user can be selected.

  However, when the key operation for setting in step S01 is performed, there are three choices of “blank”, “default setting image”, and “user setting image”, and a guide message that prompts one of them to be selected is displayed. After the projection, the determination is made based on the contents of the key operated thereafter, and the selected setting is held (step S06).

  Thereafter, the normal projection operation is performed, and the document placed on the document table 12 is photographed by the CCD 41 as a subject, and the image data is input from the document photographing unit 36 and temporarily stored in the document storage unit 37 ( Step S07).

Next, the print contrast value PCS (Print Contrast Signal) is obtained by using two points having the largest difference in reflectance with a plurality of predetermined points in the held image, for example, a total of five points including the center of the photographing optical axis and four corners as measurement points. Next formula
PCS = (Rp−Ri) / Rp
(However, Rp: reflectance of (white) ground on the paper surface,
Pi: Reflectance of ink on the paper. )
Based on whether or not the obtained contrast value is larger than a preset threshold value, it is determined whether or not any document is placed on the document table 12 as a subject (step S08).

  If a contrast value greater than the threshold value is obtained and it is determined that the document is placed on the document table 12 as a subject, the image data of the document read in the immediately preceding step S07 is used as the basis. Then, an optical image is formed by the micromirror element 26 and projected from the projection lens 14 onto the screen to be projected (step S09).

  In this projection state, it is continuously determined whether or not the power key is operated to end the projection (step S10) and whether or not the projection state when no subject is set (step S11). Then, the process returns to step S07 again, and the photographing and projecting operations of the document placed on the document table 12 as the subject are continued.

  If it is determined in step S08 that the contrast value obtained from the image data of the photographed document is equal to or less than a preset threshold value and no document as a subject is placed on the document table 12 Next, it is determined what is set as an image to be projected when there is no subject (step S12).

  Here, when “blank” is set and it is determined that a specific image is not displayed, according to the setting, a blank state of one black or one blue is set without performing any projection (step). S13).

  FIG. 4 illustrates the state of this blank projection. In this example, the character “(BLANK)” is written for the purpose of explanation, but in actuality, such a character is not required to be displayed. Alternatively, a single color image is projected in blue.

  At this time, in order to project a black image, all the primary colors R (red), G (green), and B (blue) transmitted through the color wheel 29 by the micromirror element 26 are applied to the projection lens 14. This is realized by substantially blocking the projection light by reflecting the entire surface outside the projection light.

  In order to project an image of a single blue color, R (red) and G (green) primary color light transmitted through the color wheel 29 by the micromirror element 26 is totally reflected outside the projection light to the projection lens 14. On the other hand, by using only the primary color light of B (blue), the projection light that is totally reflected in the projection light to the projection lens 14 is realized.

  If it is determined in step S12 that a default image is set as an image to be projected when there is no subject, the default image prepared from the program memory 35 in the projector device 10 from the beginning according to the setting. Is stored in the video RAM 25, and a corresponding optical image is formed by the micromirror element 26 and projected from the projection lens 14 toward the projection target (step S14).

  FIG. 5 illustrates a state where the default setting screen is projected. Here, as a standby for the next projected image, for example, by projecting an image IM01 in which characters such as “NEXT ...” are inserted in a rape flower image, the next projected image is waited. It expresses that

  Further, if it is determined in step S12 that an image arbitrarily set by the user as an image to be projected when there is no subject is set, the image data stored in the document storage unit 37 is stored according to the setting. The data is read and held in the video RAM 25, and a corresponding optical image is formed by the micromirror element 26 and projected from the projection lens 14 toward the projection target (step S15).

  FIG. 6 explains a screen arbitrarily set by the user. Here, assuming that the next image to be projected is awaited, by projecting the image IM02 created by the user for presentation or the like, it looks good even when there is no image to be originally projected, and the presentation etc. smoothly Will be able to proceed.

  After selecting one of the projections in steps S13 to S15, the process proceeds to step S10 and the projection operation is continued.

  However, if there is a key operation for setting the projection state when there is no subject in step S11, the process proceeds to step S06, and the document as the subject is not placed on the document table 12 instead. One of the three options is selected to set the image to be displayed, and the selected setting is retained.

  If a key operation for not setting the projection state in the state where the document as a subject is not placed on the document table 12 is performed in step S01, the process proceeds to the normal projection operation as it is, and the document table is changed. 12 is photographed by the CCD 41 as a subject, and the image data is input from the document photographing unit 36 and temporarily stored in the document storage unit 37 (step S02).

  Next, an optical image is formed by the micromirror element 26 based on the read image data of the document, and is projected onto the screen to be projected from the projection lens 14 (step S03).

  In the process of steps S02 and S03, the projection operation is executed on the assumption that a document is placed regardless of whether or not a document is actually placed on the document table 12. .

  Therefore, even if the document is removed from the document table 12 and nothing is present, or the document is moving on the document table 12 to replace the document, the image is read and read regardless of the state. Projection of the resulting image is performed.

  In this projection state, it is continuously determined whether or not the power key is operated to end the projection (step S04) and whether or not to set the projection state when there is no subject (step S05). Then, the process returns to step S02 again, and the photographing and projecting operations of the document placed on the document table 12 as the subject are continued.

  If there is a key operation for setting the projection state when there is no subject in step S05, the process proceeds to step S06, and the document as the subject is not placed on the document table 12 instead. One of the three options is selected to set the image to be displayed, and the selected setting is retained.

  When the operation of the power key for ending the projection is performed in step S10 or S04, the projection operation in the document input mode according to FIG. 3 is temporarily ended.

  As described above, according to the present embodiment, the projection of unnecessary images, such as a state in which a document as a subject is not placed on the document table 12, is restricted, and the projected image is viewed. It is possible to avoid giving an unpleasant impression as much as possible.

  In step S08 in FIG. 3, a document as a subject is displayed on the document table 12 depending on whether or not the print contrast value PCS obtained from the image data of the document table 12 obtained by photographing is larger than a predetermined threshold value. Although it is determined whether or not it is placed in a stationary state, the present invention is not limited to this.

  For example, using a plurality of predetermined points as measurement points, the density of YMC (Y: yellow, M: magenta, C: cyan) at each measurement point is measured, and the difference between the two points having the largest density difference is obtained. If the difference is greater than or equal to a certain value, it may be determined that the document as the subject is placed on the document table 12.

  Alternatively, the reflectance A or the density value B at the document table 12 is stored in the program memory 35 in advance, and the measurement data C that is most different from the A value or the B value among a plurality of locations near the center. If there is a difference between the values of C and A or C and B that exceeds a certain level, it may be determined that the document as the subject is placed on the document table 12.

  In any case, a document as a subject is not placed on the document table 12, or even if it is placed, it is not in a stationary state, and the document is printed at the moment of photographing with the CCD 41 to replace the document. Is moving on the document table 12, the contrast value of the acquired image data is clearly significantly reduced, so that the document as a subject is placed on the document table 12 in a stationary state. It is possible to determine the state of not being very easily and accurately.

  In the above embodiment, image data in place of the document image is stored in advance in the program memory 35 or the document storage unit 37, and stored in a state where the document is not placed. Therefore, even when the document document is replaced during the presentation using the projector device 10, for example, the complicated state on the document table 12 is not projected and the image is displayed. The presentation operation can be smoothly continued without the projection state being interrupted.

  At that time, by enabling the projection of the default image, it is possible to realize an uninterrupted state of the image projection state while reducing the burden on the user, while allowing the user to arbitrarily set and project the image. The above-described presentation can be executed more effectively, and in any case, a comfortable projection environment can be realized appropriately according to the user's selection settings.

  In addition, although the said embodiment demonstrated embodiment when a projector apparatus of a DLP (trademark) system is applied as what has a document camera function, this invention is not limited to this, A projector apparatus As a method according to a display element that forms a light image, for example, a liquid crystal projector device that performs a projection operation using a transmissive color liquid crystal panel as a display element, or a monochrome liquid crystal display panel that uses a primary color light source in a time-sharing manner The present invention can be similarly applied to a field-sequentially driven liquid crystal type projector device that transmits light through the screen.

  Similarly, it is not limited to a document camera that reads the document table 12 placed on the document table 12 with the document surface facing down, from the lower surface side thereof. Of course, the present invention can be similarly applied to a document having a configuration of a stand-type document camera that reads a predetermined image taken from above the document placed on the document table.

  In addition, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention in the implementation stage. In addition, the functions executed in the above-described embodiments may be combined as appropriate as possible. The above-described embodiment includes various stages, and various inventions can be extracted by an appropriate combination according to a plurality of disclosed structural requirements. For example, even if several constituent requirements are deleted from all the constituent requirements shown in the embodiment, if the effect can be obtained, a configuration from which the constituent requirements are deleted can be extracted as an invention.

1 is a perspective view showing an external configuration of a projector device with a document camera function according to an embodiment of the present invention. The block diagram which shows the function structure of the electronic circuit of the projector apparatus which concerns on the same embodiment. 6 is a flowchart showing processing details of a projection operation in a document camera mode according to the embodiment. The figure which illustrates the blank projection state at the time of the non-subject concerning the embodiment. The figure which illustrates the projection state of the default setting image at the time of a to-be-photographed object based on the embodiment. The figure which illustrates the projection state of the user setting image at the time of the non-subject based on the embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Projector apparatus, 11 ... Main body casing, 12 ... Document stand, 13 ... Cover mounting part, 14 ... Projection lens, 15 ... Leg part, 16 ... Ir light-receiving part, 17 ... Key switch part, 21 ... Input / output connector part, DESCRIPTION OF SYMBOLS 22 ... Input / output interface (I / F), 23 ... Image conversion part, 24 ... Projection control part, 25 ... Video RAM, 26 ... Micromirror element (SOM), 27 ... Reflector, 28 ... Light source lamp, 29 ... Color wheel , 30 ... Integrator, 31 ... Mirror, 32 ... Motor (M), 33 ... Projection light processing unit, 34 ... Control unit, 35 ... Program memory, 36 ... Document shooting unit, 37 ... Document storage unit, 38 ... Audio processing unit , 39: light source lamp, 40: photographing lens, 41: CCD, 42: speaker, SB: system bus.

Claims (6)

Image acquisition means for acquiring image information of a document table on which the document is placed;
Projection means for forming and projecting an optical image based on the image information obtained by the image acquisition means;
Determination means for determining a state in which a document is not placed stationary on the document table from image information obtained by the image acquisition means;
A document projection apparatus comprising: a projection control unit that temporarily stops projection of image information obtained by the image acquisition unit by the projection unit in response to a determination result of the determination unit.   2. The document projection apparatus according to claim 1, wherein the determination unit determines a state in which no document is placed on the document table based on a contrast value of image information obtained by the image acquisition unit. It further comprises image storage means for storing image information to replace the document image in advance,
2. The document projection according to claim 1, wherein the projection control unit causes the projection unit to project the image information stored in the image storage unit when the projection of the image information obtained by the image acquisition unit is temporarily stopped. apparatus. The image storage means stores a plurality of pieces of image information,
And further comprising selection means for selecting one of the plurality of images stored in the image storage means,
The projection control means reads the image information selected by the selection means from the image storage means and causes the projection means to project when the projection of the image information obtained by the image acquisition means is temporarily stopped. Item 4. The document projection apparatus according to Item 3. Document printing on a document projection apparatus comprising an image acquisition unit that acquires image information of a document table on which a document is placed, and a projection unit that forms and projects a light image based on the image information obtained by the image acquisition unit A projection method,
A determination step of determining a state in which the document is not placed stationary on the document table from the image information obtained by the image acquisition unit;
A document projection method comprising: a projection control step of temporarily stopping projection of image information obtained by the image acquisition unit by the projection unit in response to a determination result in the determination step. A document projection apparatus including an image acquisition unit that acquires image information of a document table on which a document is placed and a projection unit that forms and projects a light image based on the image information obtained by the image acquisition unit is built in. A program executed by a computer,
A determination step for determining a state in which the document is not placed stationary on the document table from the image information obtained by the image acquisition unit;
A program that causes a computer to execute a projection control step of temporarily stopping projection of image information obtained by the image acquisition unit by the projection unit in response to a determination result in the determination step.

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