JP2014010609A - Projection device, pointer device and projection system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve detection accuracy of a point position irrespective of a distance between a projection plane and a pointer device.SOLUTION: The projecting device includes: an input/output part 11 that inputs an image signal; a light source part 15 that has a light emitting element; projection systems 13, 14, 16 and 17 each of which forms an optical image corresponding to the image signal to be input by use of light emitted by the light source part 15 and projects the light image; and a Central Processing Unit (CPU) 18 that inserts an optical image corresponding to a position detection image for detecting a position in the optical image, projects the optical image through the projection systems 13, 14, 16 and 17, transmits information instructing detection of a position coordinate to an external pointer device of the device via a pointer communication part 23 and an antenna 25 at a timing of projecting the optical image corresponding to the position detection image, receives illuminance information transmitted from the responding pointer device via the antenna 25 and the pointer communication part 23 and adjusts brightness of the position detection image on the basis of the received illuminance information.

Description

  The present invention relates to a projection apparatus, a pointer apparatus, and a projection system suitable for a DLP (registered trademark) projector using a dedicated pointer pen.

  In order to accurately detect the position indicated by the laser beam or the like in the projection image projected on the screen, an area sensor that images the screen and a laser beam that is emitted from the laser pointer to the area sensor are input to a color-sequential projector. An area sensor unit composed of an optical filter or the like that uses only R light of the same color and a timing extraction unit that extracts R, G, and B projection timings are provided, and the projection timing of the R image arrives during the explanation image projection period. Then, even if there is a portion of the same color as the laser beam in the projected image by letting the MPU perform a process of picking up an image of the screen at that time and detecting the indicated position indicated by the laser beam based on the picked-up image A technique for enabling detection of the indicated position is considered. (For example, Patent Document 1)

JP 2004-110797 A

  In order to detect the pointing position with a projector using a general-purpose laser pointer or other pointing device, including the technique described in the above-mentioned patent document, an imaging unit such as an area sensor for shooting a projected image on the projector side Is necessary, and the configuration of the apparatus is complicated and the cost increases.

  Recently, in a DLP (registered trademark) projector, an environment that can be used like a laser pointer is realized by using a dedicated pointer pen. This type of dedicated pointer pen includes a light receiving sensor unit that detects the brightness of a spot-like minimum range and a communication unit that transmits and receives control signals between the projector body.

  FIG. 6 is a timing chart illustrating the projection image timing on the DLP (registered trademark) system projector apparatus main body side using the dedicated pointer pen and the operation content on the dedicated pointer pen side. One frame of the color image is composed of an image period that occupies most of the frame and a coordinate period for detecting pointer coordinates inserted at the end timing.

  The image period is composed of three fields of R (red), G (green), and B (blue). On the projector body side, in the R field, red light is continuously emitted from the light source unit during the field period (P01), and at the same time, the red component image IMr is displayed on the micromirror element, which is the display element. An optical image is formed and projected through a projection lens (P02).

  Similarly, in the G field, the light source unit continuously emits green light during the field period (P03), and at the same time, the green component image IMg is displayed on the micromirror element, which is the display element, so that the green component light image is displayed. Form and project through the projection lens (P04). In the B field, the light source portion continuously emits blue light during the field period (P05), and at the same time, the blue component image IMb is displayed on the micromirror element as the display element, thereby forming a blue component light image. Then, the image is projected through the projection lens (P06).

  In one coordinate period, the R, G, and B light sources are simultaneously turned on simultaneously in the light source unit to emit white light as a mixed color (P07), and at the same time, a total of 4 in the micromirror element as a display element. By sequentially displaying the gradation images IMc1 to IMc4, a light image of the white coordinate position detection image is formed and projected through the projection lens, and synchronized with the projection of the gradation images IMc1 to IMc4. To instruct the dedicated pointer pen to detect illuminance.

  Here, in order to simplify the drawing, only two of IMc1 and IMc3 are extracted from the four gradation images IMc1 to IMc4.

  The dedicated pointer pen executes illuminance detection of the facing image portion according to the instruction timing from the projector main body, converts the detection result into coordinate data, and transmits it to the projector main body. The projector body projects the beam light from the dedicated pointer pen by superimposing a pointer image such as an arrow on the corresponding position in the projected image according to the coordinate data sent from the dedicated pointer pen. It appears on the image as if it were specifying the position.

  In principle, for example, one of the upper end and the lower end for Y coordinate detection is the brightest and the other is the darkest gradation as the gradation image projected by the projector main body during the coordinate period in order to use this kind of dedicated pointer pen. A set of two images (for example, IMc1) and an image (for example, IMc3) in which one of the left end and the right end for X coordinate detection is the brightest and the other has the darkest gradation can be configured as a minimum unit.

  However, when only one set of gradation images is inserted in the coordinate period, as an afterimage combining the two images, a luminance change is given such that the luminance changes obliquely along one diagonal line with respect to the original projection image. It becomes unnatural.

  For this reason, in order to cancel this, the images whose gradation gradation change directions are opposite to each other are paired, and for example, the luminance change opposite to that of the gradation image IMc1 and the luminance change opposite to that of the gradation image IMc3 are made. The image IMc4 is added, and two sets of four gradation images are inserted as basic units.

  However, with such a dedicated pointer pen that detects the brightness of the projection surface, the brightness obtained varies greatly depending on the distance to the projection surface, for example. Therefore, when the projection surface is close and the actual received light amount is large compared to the dynamic range of the received light amount by the pointer pen, and the projection surface is far away and the actual received light amount is small, the position detection accuracy is high. There is a problem that it drops significantly.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a projection device, a pointer device, and a projection system that can improve detection accuracy of a point position.

  One embodiment of the present invention uses an input unit that inputs an image signal, a light source having a light emitting element, and light emitted from the light source to form and project an optical image corresponding to the image signal input by the input unit. Projection means for projecting, a projection control means for inserting a light image corresponding to a position detection image for detecting a position in the optical image and projecting it by the projection means, and the position detection image by the projection control means Transmitting means for transmitting information instructing detection of position coordinates to a pointer device outside the apparatus at a timing at which a light image corresponding to the above is projected by the projection means, and the pointer device in response to transmission by the transmission means Receiving means for receiving illuminance information sent from the apparatus, and brightness adjusting means for adjusting the brightness of the position detection image projected by the projection control means based on the illuminance information received by the receiving means Characterized by comprising a.

  According to the present invention, the point position detection accuracy can be improved.

The figure which shows the connection structure of the projection system which concerns on one Embodiment of this invention. FIG. 2 is a block diagram showing a functional configuration of the data projector apparatus according to the embodiment. The block diagram which shows the function structure of the pointer pen which concerns on the embodiment. 6 is a flowchart showing the processing content related to pointer position detection image setting according to the embodiment. The flowchart which shows the processing content of the point position detection by the pointer pen side and illuminance measurement which concern on the same embodiment. 6 is a timing chart illustrating a projection image timing on the DLP (registered trademark) system projector apparatus main body side that uses a dedicated pointer pen, and an operation content on the dedicated pointer pen side.

  Hereinafter, an embodiment in which a projection system is constructed by connecting a personal computer (hereinafter abbreviated as “PC”) to a DLP (registered trademark) projector will be described with reference to the drawings.

  FIG. 1 illustrates the connection configuration of the projection system according to the present embodiment. In the figure, 1 is a projector and 2 is a PC that provides an image to be projected onto the projector 1. The projector 1 and the PC 2 are connected by wire with a VGA cable VC and a USB cable UC. An image signal is provided from the PC 2 via the VGA cable VC, and the projector 1 projects a projection image PI corresponding to the image signal onto the screen as needed.

  A pointer pen 3 dedicated to the projector 1 is wirelessly connected between the projector 1 and the pointer pen 3 by, for example, Bluetooth (registered trademark) technology. The projection image PI projected by the projector 1 includes a position detection image in a time division manner in addition to the image provided from the PC 2.

  The pointer pen 3 includes a communication circuit with the projector 1 and an arithmetic circuit that calculates position coordinates from the received light intensity (illuminance). The pointer pen 3 receives an illuminance measurement instruction from the projector 1, and the light receiving unit of the pointer pen 3 The position coordinate is calculated from the illuminance at the point position in the projected image PI that is faced, and is transmitted to the projector 1 as the coordinate information (position coordinate) of the point instruction.

In the projector 1, based on the received coordinate information of the pointer pen 3, an image signal that superimposes the image of the point mark PT on the projection image PI is generated and projected.
Therefore, the user holding the pointer pen 3 can operate the pointer pen 3 as if the light having the shape of the point mark PT is emitted directly from the pointer pen 3.

FIG. 2 is a diagram showing a schematic functional configuration of the projector 1.
The input / output unit 11 includes, for example, a video input terminal, an RGB input terminal, a VGA terminal, a USB terminal for connecting to a PC, and the like. The image signal input to the input / output unit 11 is digitized as necessary, and then sent to the image conversion unit 12 via the system bus SB.

  The image conversion unit 12 is also referred to as a scaler, and the input image data is unified into image data of a predetermined format suitable for projection and sent to the projection processing unit 13.

  At this time, data such as symbols indicating various operating states for OSD (On Screen Display) including the point mark PT is also superposed on the image data by the image conversion unit 12 as necessary, and the processed image data is projected. The data is sent to the processing unit 13.

  The projection processing unit 13 multiplies a frame rate according to a predetermined format, for example, 120 [frames / second], the number of color component divisions, and the number of display gradations, in accordance with the transmitted image data. The micromirror element 14 that is a spatial light modulation element is driven to display by the time-division driving.

  This micromirror element 14 is turned on / off individually at a high speed for each inclination angle of a plurality of micromirrors arranged in an array, for example, WXGA (Wide eXtended Graphics Array) (horizontal 1280 pixels × vertical 800 pixels). By displaying the image, an optical image is formed by the reflected light.

  At this time, the image displayed by the micromirror element 14 includes the point position detection image of the pointer pen 3 at an appropriate frequency in a time division manner instead of the image corresponding to the image signal input by the input / output unit 11. It is. Details will be described later.

  On the other hand, light of a plurality of colors including primary color lights of R (red), G (green), and B (blue) is sequentially emitted in a time division manner from the light source unit 15 in a time division manner. The light from the light source unit 15 is totally reflected by the mirror 16 and applied to the micromirror element 14.

  Then, a light image corresponding to the color of the light source light is formed by the reflected light from the micromirror element 14, and the formed light image is projected and displayed on a screen (not shown) to be projected through the projection lens unit 17. Is done.

  The light source unit 15 includes, for example, three types of semiconductor light emitting elements that emit R, G, and B primary colors, such as LEDs (light emitting diodes) and LDs (semiconductor lasers). It is assumed that W (white) light is emitted by causing the light emitting elements to emit light simultaneously, and a monochrome image can be projected from the projection lens unit 17.

  The CPU 18 controls all the operations of the above circuits. The CPU 18 is directly connected to the main memory 19 and the program memory 20. The main memory 19 is composed of, for example, an SRAM and functions as a work memory for the CPU 18. The program memory 20 is composed of an electrically rewritable nonvolatile memory, and stores an operation program executed by the CPU 18 and various fixed data. The CPU 18 uses the main memory 19 and the program memory 20 to perform overall control operations in the projector 1.

  The CPU 18 performs various projection operations according to key operation signals from the operation unit 21. The operation unit 21 includes a key operation unit provided in the main body of the projector 1 and an infrared light receiving unit that receives infrared light from a remote controller (not shown) dedicated to the projector 1. A key operation signal based on the key operated by the remote controller is directly output to the CPU 18.

The CPU 18 is further connected to an audio processing unit 22 and a pointer communication unit 23 via the system bus SB. The sound processing unit 22 includes a sound source circuit such as a PCM sound source, converts the sound data given during the projection operation into an analog signal, drives the speaker unit 24 to emit a loud sound, or generates a beep sound or the like as necessary.
The pointer communication unit 23 is wirelessly connected to the pointer pen 3 via the antenna 25, receives coordinate information sent from the pointer pen 3, operation signals of various keys provided in the pointer pen 3, and the like to the CPU 18. Send it out.

Furthermore, the pointer communication unit 23 also transmits an instruction for detecting the illuminance to the pointer pen 3 and a setting as to whether or not to adjust the brightness of the position detection image. (Details will be described later.)
Next, the functional configuration of the pointer pen 3 will be described with reference to FIG.
A light receiving lens system 31 is incorporated at the tip of the pointer pen 3, and, for example, a phototransistor 32 is disposed as a light receiving element at a focus position of the light receiving lens system 31. The output signal of the phototransistor 32 is digitized by the A / D conversion unit 33 and then sent to the coordinate calculation unit 35 via the holding unit 34.

  The coordinate calculation unit 35 calculates and checks the position coordinates indicating the point position of the pointer pen 3 in the projection image PI from the contents of the holding unit 34 and outputs the calculation result to the CPU 36 via the bus B.

  The CPU 36 controls the A / D conversion unit 33, the holding unit 34, the coordinate calculation unit 35, and the pointer pen 3 as a whole, and the main memory 37 and the program memory 38 are directly connected to each other. The main memory 37 functions as a work memory for the CPU 36. The program memory 38 stores an operation program executed by the CPU 36 and various fixed data. The CPU 36 executes the control operation in the pointer pen 3 using the main memory 37 and the program memory 38.

  Further, a key operation signal is input from the click key unit 39 to the CPU 36. The click key unit 39 outputs an operation signal of each of the two click keys disposed along the axial direction of the pointer pen 3 to the CPU 36, for example.

  Here, the two click keys constituting the click key unit 39 are, for example, as shown in FIG. 1, the click key 3a (corresponding to the left click key of the mouse pointer) located on the tip side of the pointer pen 3 and having a larger operation area. And a relatively small click key 3b (corresponding to the right click key of the mouse pointer) located on the rear side adjacent to the key.

  Further, the CPU 36 is also connected to the projector communication unit 40 via the bus B. The projector communication unit 40 is wirelessly connected to the projector 1 via the antenna 41, receives information instructing illuminance detection from the projector 1, and is calculated based on the illuminance acquired at the designated timing. The information on the average illuminance and the operation signal of the click key unit 39 are transmitted to the projector 1.

Further, the projector communication unit 40 can receive a setting as to whether or not to adjust the brightness of the position detection image by the brightness adjusting means, and can change the process according to the setting. (Details will be described later.)
Note that the hardware configuration of the PC 2 is a very common and well-known technique, and therefore the description thereof will be omitted.

Next, the operation of the above embodiment will be described with reference to FIGS.
FIG. 4 is a timing chart illustrating the projection image timing on the main body side of the projector 1 and the operation content on the pointer pen 3 side. One frame of the color image is composed of an image period that occupies most of the frame and a coordinate period for detecting pointer coordinates inserted at the end timing.

  The image period is composed of three fields of R (red), G (green), and B (blue). On the projector 1 main body side, in the R field, the light source unit 15 emits red light continuously during the field period (P11), and at the same time, the red mirror image IMr is displayed on the micromirror element 14 as a display element. A red component light image is formed and projected through the projection lens unit 17 (P12).

  Similarly, in the G field, the light source unit 15 continuously emits green light during the field period (P13), and at the same time, the green component image IMg is displayed on the micromirror element 14, thereby forming a green component light image. Then, the image is projected through the projection lens unit 17 (P14). In the B field, the light source unit 15 continuously emits blue light during the field period (P15), and at the same time, the micromirror element 14 displays the blue component image IMb, thereby forming and projecting a blue component light image. Projecting is performed through the lens unit 17 (P16).

  In one coordinate period, the light source unit 15 continuously turns on each of the R, G, and B light sources to emit white light as a mixed color (P07), and at the same time, the micromirror element 14 generates a total of four sheets. By displaying the gradation images IMc1 to IMc4 sequentially in a time-division manner, a light image of a white coordinate position detection image is formed and projected through the projection lens unit 17, and the gradation images IMc1 to IMc4 are projected together. The pointer pen 3 is instructed to detect illuminance in synchronization with each other.

Here, in order to simplify the drawing, only two sheets of the first IMc1 and the third IMc3 are extracted from the four gradation images IMc1 to IMc4.
The gradation image IMc2 is an image obtained by inverting the light and dark pattern of the gradation image IMc1. Similarly, it is assumed that the gradation image IMc4 is an image obtained by inverting the light and dark pattern of the gradation image IMc3.

Now, let us consider an example of the projection timing of a color image having a frame number: m (m is a natural number) and a frame number: m−1 positioned in front of it.
In the coordinate period at the time of projecting one frame of the color image of the frame number: m-1, first, at the initial timing t11, the projector 1 starts projecting the gradation image IMc1 and instructs the pointer pen 3 to detect illuminance. Is sent out.

  Upon receiving this instruction, the pointer pen 3 performs a light receiving operation after a preset adjustment time Δt, and acquires the amount of light received by the phototransistor 32 through the light receiving lens system 31 at that time (P21). This amount of received light changes according to the relative distance between the projector 1 and the pointer pen 3 and becomes an illuminance corresponding to the coordinate position in the projected image PI where the optical axis of the light receiving lens system 31 faces.

  Since the gradation image IMc1 is an image in which the gradation changes along the vertical direction of the image, it is possible to detect the illuminance corresponding to the Y coordinate of the position where the pointer pen 3 points to the projection image PI.

  The same operation is also performed for the projection of the subsequent gradation images IMc2 to IMc4, and the illuminance corresponding to the Y coordinate for the gradation image IMc2 and the X for the gradation image IMc3 as needed with the pointer pen 3 in response to an instruction from the projector 1 The light receiving operation with the illuminance (P23) corresponding to the coordinates and the illuminance corresponding to the X coordinate for the gradation image IMc4 is executed.

  In the pointer pen 3, after the illuminance detection for these four gradation images IMc1 to IMc4, at the beginning of the image period of the subsequent frame number: m, the coordinate position pointed to in the projection image PI is calculated from each illuminance information. (P25), and sends the image data to the projector 1 via the projector communication unit 40 and the antenna 41 (P26).

  In addition to the transmission of the point coordinate position, the pointer pen 3 also has information indicating the average illuminance as a result of the four illuminance detections when the mode for adjusting the light amount in the coordinate period is set. (P27).

  Upon receiving this, the projector 1 performs a projection operation such that the point mark PT is superimposed on the projection image PI in accordance with the received coordinate position, and also the light source in the coordinate period that continues in accordance with the received illuminance information. The respective light emission amounts of R, G, and B of the unit 15 are adjusted (P31).

  That is, the CPU 18 on the projector 1 side considers the contents of the coordinate data of the point position detected on the pointer pen 3 side, and the average illuminance information sent at the same time deviates from the preset illuminance information range. The amount of light emission is adjusted depending on whether or not there is.

  Specifically, when the average value of the illuminance detected on the pointer pen 3 side is higher than the upper limit value of the preset illuminance information range, it is determined that the pointer pen 3 is too close to the projection plane. Thus, the light emission amount in the coordinate period is reduced.

  On the other hand, if the average value of the illuminance detected on the pointer pen 3 side is lower than the lower limit value of the preset illuminance information range, it is determined that the pointer pen 3 is too far from the projection plane, Increase the amount of light emission in the coordinate period.

  Thus, the phototransistor 32 of the pointer pen 3 sets a range of illuminance information that is set in advance based on the dynamic range of the light receiving performance, and if the phototransistor 32 is out of the range, the light emission amount in the coordinate period is set in the correct direction. By adjusting to, the detection accuracy of the point position by the pointer pen 3 can always be kept high corresponding to the distance between the projection plane and the pointer pen 3.

  Further, when adjusting the light emission amount, by adjusting according to the driving conditions (for example, driving current value) of the semiconductor light emitting element in the light source unit 15, position detection can be performed without changing the display gradation on the micromirror element 14. Therefore, the light emission amount can be adjusted while maintaining the quantization level (for example, 8 bits).

  On the other hand, the light emission amount can be adjusted as a result by changing the display gradation on the micromirror element 14 without changing the driving condition of the semiconductor light emitting element in the light source unit 15. When the light emission amount is adjusted by the display gradation as described above, it is suitable for an apparatus using an element such as a high pressure mercury lamp in which it is difficult to adjust the luminance of the light emitting element used in the light source unit 15 at high speed. Can be adjusted easily and with high accuracy.

Next, the contents of processing executed on the pointer pen 3 side will be described with reference to FIG.
FIG. 5 is a flowchart showing the processing contents relating to the point coordinate position detection executed by the CPU 36 in the pointer pen 3 as a pointing device for the projection image PI.

  At the beginning of the process, the CPU 36 sets the variable n for counting the number of gradation images to an initial value “1” (step S01), and then waits for an illuminance detection instruction signal from the projector 1 (step S01). S02).

  When an illuminance detection instruction signal is sent from the projector 1, it is determined in step S02, and standby adjustment is performed for a preset time Δt (step S03). Thereafter, the CPU 36 detects the illuminance at the point position in the gradation image that is the projected image PI at that time based on the amount of light received by the phototransistor 32 (step S04), and the detected illuminance information corresponds to the value of the variable n at that time. In addition, it is held by the holding unit 34.

  Next, the CPU 36 updates the value of the variable n to “+1” and sets it to “2” (step S06), and the updated variable n is not a numerical value “5” exceeding the total number of gradation images “4”. After confirming (step S07), the process returns to step S02 again.

  In this way, when the processes in steps S01 to S04 are repeated four times in total and the detection of the illuminance at the point positions in the four gradation images is completed, the CPU 36 determines that the variable n has become the numerical value “5” in step S07. The coordinate calculation unit 35 calculates the pointed coordinate position based on the content held in the holding unit 34 (step S08).

  In addition, the CPU 36 causes the coordinate calculation unit 35 to calculate the average value of the illuminance information for a total of four times (step S09).

  Next, the CPU 36 determines whether or not the mode for adjusting the light amount of the coordinate position detection image is set at that time (step S10).

  If it is determined that the light amount adjustment mode is set, the CPU 36 transmits information on the point coordinate position calculated in step S08 and the average illuminance information calculated in step S09 to the projector 1 (step S11) Assuming that the series of processes has been completed, the process returns to the process from step S01 to prepare for the next point coordinate position detection.

  If it is determined in step S10 that the light amount adjustment mode is not set, the CPU 36 transmits only the information on the point coordinate position calculated in step S08 to the projector 1 (step S12). Assuming that the processing is completed, the processing returns to step S01 to prepare for the next point coordinate position detection.

  In the description of FIG. 5 described above, the case where the pointer pen 3 side determines whether or not the light amount adjustment mode is set and the content of information to be transmitted to the projector 1 is changed, but the pointer pen 3 side unconditionally. The information on the point coordinate position and the average illuminance information may be transmitted to the projector 1, and the received average illuminance information may be used as necessary depending on whether the light amount adjustment mode is set on the projector 1 side.

  Further, in the flow of FIG. 5, prior to the determination in step S10 whether or not the mode for adjusting the light amount of the coordinate position detection image is set, the coordinate calculation unit 35 calculates the average value of the illuminance information for a total of four times. However, only when it is determined that the mode for adjusting the light amount of the coordinate position detection image is set, the coordinate calculation unit 35 calculates the average value of the illuminance information for four times in total. You may make it perform the step to calculate.

  In that case, when the mode for adjusting the light amount of the coordinate position detection image is not set, it is possible to avoid performing the step of calculating the average value of the illuminance information for a total of four times by the coordinate calculation unit 35. When the mode for adjusting the light amount of the coordinate position detection image is not set, the load on the point pen 3 side can be reduced, and the processing can be speeded up.

  Whether or not the mode for adjusting the light amount of the coordinate position detection image is set may be received from the projection apparatus 1 or may be set individually on the point pen 3 side.

  In the flow of FIG. 5 described above, the average illuminance information is calculated on the point pen 3 side, but the average illuminance may be calculated on the projector 1 side.

  In this case, the load on the point pen 3 side can be further reduced, and the power consumption of the pointer pen 3 that must use a battery as a power source can be suppressed as much as possible.

  As described above in detail, according to the present embodiment, the influence of the distance between the position of the image PI projected by the projector 1 and the pointer pen 3 is eliminated as much as possible, and the amount of light received by the pointer pen 3 is set to an appropriate range. As a result, it is possible to improve the detection accuracy of the point position by the pointer pen 3.

In the above embodiment, the light amount of the gradation image for coordinate position detection projected in the coordinate period is independent of the light amount of the image projected in the image period in the image period and the coordinate period constituting one frame of the color image. It was supposed to be adjusted.
Thereby, the detection accuracy of the point position of the pointer pen 3 can be improved without directly affecting the brightness of the projected image in the image period visually recognized by the user, which can be adjusted by the brightness setting key or the projection mode setting menu.

  In the above embodiment, since the brightness is adjusted for each frame into which the position detection image is inserted, the detection accuracy of the point position of the pointer pen 3 can be improved quickly and continuously.

  In the above embodiment, the coordinates of the point position are calculated on the pointer pen 3 side, and the calculation result is transmitted to the projector 1, so the burden on position detection by the CPU 18 on the projector 1 side performing the projection operation is reduced. it can.

  On the other hand, a configuration is also conceivable in which the illuminance detection and transmission of the detected illuminance information are only performed on the pointer pen 3 side, and the point position is calculated from the illuminance information on the projector 1 side. With such a configuration, the power consumption of the pointer pen 3 that must use a battery as a power source can be minimized.

  In the above embodiment, since the point mark PT is projected on the projection image PI based on the calculation result, the position pointed by the pointer pen 3 is visualized, and the pointer pen having only the light receiving means. 3 can be used as if it were a laser pointer, and depending on the setting, the shape and color of the point mark PT can be arbitrarily changed to match the projection image PI.

  In the above embodiment, two images are used in which the brightness per unit time is uniform for each position and the change patterns of light and darkness are inverted with respect to each other as in the relationship between the gradation images IMc1 and IMc2, and IMc3 and IMc4. As a result, the influence of ambient light can be offset and point position detection accuracy can be improved.

  In addition, in the above embodiment, two sets of images in which the directions of the change patterns of light and dark are orthogonal to each other as in the relationship between the gradation images IMc1 and IMc2 and IMc3 and IMc4, The two-dimensional coordinate position can be accurately detected.

  Further, in the above embodiment, since the light source unit 15 of the projector 1 uses a semiconductor light emitting element, high-speed luminance adjustment can be realized, and position detection can be performed without affecting the brightness of the originally projected image. Accuracy can be improved.

  Although not described in the above embodiment, in a general projector apparatus, a mode in which brightness is given priority over a color of an image projected in a presentation or the like (presentation mode) or a brightness such as when playing a movie is used. Most models that can select and set various projection modes, such as a mode that prioritizes color reproducibility (theatre mode), and the usage frequency of the pointer pen differ depending on the projection mode. Conceivable.

  Therefore, for example, in a mode that prioritizes color reproducibility, the brightness of the position detection image should be adjusted in consideration of the setting state of the projection mode so that the brightness of the position detection image is kept low. If necessary, it is possible to appropriately balance the improvement in detection accuracy of the pointer pen 3 and the maintenance of the image quality of the projected image.

  In the above embodiment, the DLP (registered trademark) projector 1 connected to the PC is described in relation to a projection system in which the projector 1 is wirelessly connected to the dedicated pointer pen 3, but the present invention is not limited thereto. The present invention is not limited to this, and the present invention is similarly applicable to a system configuration in which the pointer pen is wirelessly connected to a PC in which an application program for using the pointer pen is installed.

  In addition, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention in the implementation stage. Further, 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 of a plurality of disclosed constituent elements. For example, even if some constituent requirements are deleted from all the constituent requirements shown in the embodiment, if the effect is obtained, a configuration from which the constituent requirements are deleted can be extracted as an invention.

Hereinafter, the invention described in the scope of claims of the present application will be appended.
The invention according to claim 1 forms an optical image corresponding to an image signal input by the input means, using an input means for inputting an image signal, a light source having a light emitting element, and light emitted from the light source. Projection means for projecting, projection control means for inserting a light image corresponding to a position detection image for detecting a position in the optical image and projecting by the projection means, and for the position detection by the projection control means Transmitting means for transmitting information instructing detection of position coordinates to a pointer device outside the apparatus at a timing at which a light image corresponding to an image is projected by the projecting means, and the pointer in response to transmission by the transmitting means Brightness adjustment for adjusting the brightness of the position detection image projected by the projection control means based on the illuminance information received by the receiving means and the illuminance information sent from the apparatus Characterized by comprising a stage.

  According to a second aspect of the present invention, in the first aspect of the invention, the projection control unit is configured such that the brightness at the time of projecting the position detection image is independent from that at the time of projecting the optical image corresponding to the image signal. It is characterized by adjusting.

  According to a third aspect of the invention, in the first or second aspect of the invention, the projection control means adjusts the brightness at the time of projecting the position detection image every time the position detection image is inserted. Features.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the projection control unit adjusts brightness at the time of projecting the position detection image according to a driving condition of a light emitting element of the light source. It is characterized by that.

  According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, the projection control unit adjusts brightness at the time of projecting the position detection image according to a gradation of the position detection image. It is characterized by that.

  The invention described in claim 6 is the invention according to any one of claims 1 to 5, wherein the receiving means receives the illuminance information together with the position coordinate information calculated by the pointer device.

  The invention according to claim 7 is the position calculation for calculating the position coordinates pointed by the pointer device based on the illuminance information received from the pointer device by the receiving means in the invention according to any one of the first to fifth aspects. The apparatus further comprises means.

  The invention according to claim 8 is the invention according to any one of claims 1 to 7, wherein the projection means arranges a pointer image at the detected coordinate position in the optical image to be projected.

  The invention according to claim 9 is the invention according to any one of claims 1 to 10, wherein the brightness adjusting means is configured such that the illuminance information received by the receiving means is brighter than a preset brightness. The position detection image projected by the projection control means is adjusted to be darker.

  According to a tenth aspect of the present invention, in the invention according to any one of the first to ninth aspects, the brightness adjusting unit is configured to perform the above operation when the illuminance information received by the receiving unit is darker than preset brightness. It is characterized in that the brightness of the position detection image projected by the projection control means is adjusted to be brighter.

  According to an eleventh aspect of the present invention, in the invention according to any one of the first to tenth aspects, the light source includes a semiconductor light emitting element.

  The invention according to claim 12 is the invention according to any one of claims 1 to 11, further comprising mode setting means for setting the brightness of the optical image projected by the projection means for each mode, and the brightness adjustment. The means adjusts the brightness of the position detection image projected by the projection control means in consideration of the mode set by the mode setting means.

  According to a thirteenth aspect of the present invention, there is provided a pointer device cooperating with the projection device, the receiving device receiving illuminance measurement instruction information from the projection device, and the presetting of the facing direction based on reception by the receiving device. Measuring means for measuring the illuminance per unit time in the specified range, and transmitting means for transmitting the illuminance information including the position coordinates in the opposite direction and the average illuminance measured by the measuring means to the projection device. It is characterized by that.

  The invention described in claim 14 further comprises calculation means for calculating position coordinates and average illuminance from the illuminance information measured by the measurement means in the invention described in claim 13, wherein the transmission means is the calculation means. The information on the position coordinates and average illuminance calculated in step 1 is transmitted.

  The invention according to claim 15 is the invention according to claim 14, wherein the receiving means receives an instruction as to whether or not to adjust the brightness of the position detection image set on the projection device side, and When the instruction to adjust the brightness of the position detection image is received by the receiving means, the average illuminance is calculated by the calculating means.

  According to a sixteenth aspect of the invention, there is provided the setting method according to the fourteenth aspect, further comprising setting means for setting whether to adjust the brightness of the position detection image in cooperation with the projection device. When the brightness of the position detection image is set by the means, the average illuminance is calculated by the calculation means.

  A seventeenth aspect of the invention includes the projection apparatus according to any one of the first to twelfth aspects and the pointer apparatus according to the thirteenth aspect.

  DESCRIPTION OF SYMBOLS 1 ... Projector, 2 ... PC, 3 ... Pointer pen, 11 ... Input / output part, 12 ... Image conversion part, 13 ... Projection process part, 14 ... Micromirror element, 15 ... Light source part, 16 ... Mirror, 17 ... Projection lens , 18 ... CPU, 19 ... main memory, 20 ... program memory, 21 ... operation unit, 22 ... audio processing unit, 23 ... pointer communication unit, 24 ... speaker unit, 25 ... antenna, 31 ... light receiving lens system, 32 ... Phototransistor 33 ... A / D conversion unit 34 ... Holding unit 35 ... Coordinate calculation unit 36 ... CPU 37 ... Main memory 38 ... Program memory 39 ... Click key unit 40 ... Projector communication unit 41 ... Antenna, B ... bus, PI ... projected image, PT ... point mark, SB ... system bus, VC ... VGA cable, UC ... USB cable.

Claims (17)

An input means for inputting an image signal;
A light source having a light emitting element;
Projecting means for forming and projecting a light image corresponding to an image signal input by the input means using light emitted from the light source;
Projection control means for inserting a light image corresponding to a position detection image for detecting a position in the light image and projecting it by the projection means;
Transmitting means for transmitting information instructing detection of position coordinates to a pointer device outside the apparatus at a timing at which the projection control means projects a light image corresponding to the position detection image by the projection means;
Receiving means for receiving illuminance information transmitted from the pointer device in response to transmission by the transmitting means;
A projection apparatus comprising: brightness adjustment means for adjusting brightness of a position detection image projected by the projection control means based on illuminance information received by the reception means.   The projection apparatus according to claim 1, wherein the projection control unit adjusts the brightness at the time of projecting the position detection image independently of the projection of the optical image corresponding to the image signal.   The projection apparatus according to claim 1, wherein the projection control unit adjusts brightness at the time of projecting the position detection image every time the position detection image is inserted.   The projection apparatus according to claim 1, wherein the projection control unit adjusts brightness at the time of projecting the position detection image according to a driving condition of a light emitting element of the light source.   The projection apparatus according to claim 1, wherein the projection control unit adjusts brightness at the time of projecting the position detection image according to a gradation of the position detection image.   The projection apparatus according to claim 1, wherein the reception unit receives the illuminance information together with position coordinate information calculated by the pointer device.   6. The projection apparatus according to claim 1, further comprising position calculation means for calculating position coordinates pointed by the pointer device based on the illuminance information received from the pointer device by the reception means. .   The projection apparatus according to claim 1, wherein the projection unit arranges a pointer image at the detected coordinate position in a light image to be projected.   The brightness adjusting means adjusts the brightness of the position detection image projected by the projection control means to be dark when the illuminance information received by the receiving means is brighter than a preset brightness. The projection apparatus according to claim 1, wherein:   The brightness adjusting means adjusts the brightness of the position detection image projected by the projection control means to be brighter when the illuminance information received by the receiving means is darker than preset brightness. The projection apparatus according to claim 1, wherein:   The projection apparatus according to claim 1, wherein the light source includes a semiconductor light emitting element. Further comprising mode setting means for setting the brightness of the light image projected by the projection means for each mode;
The brightness adjustment unit adjusts the brightness of the position detection image projected by the projection control unit in consideration of the mode set by the mode setting unit. Projection device. A pointer device cooperating with the projection device,
Receiving means for receiving illuminance measurement instruction information from the projection device;
Measuring means for measuring illuminance per unit time in a preset range in the opposite direction based on reception by the receiving means;
A pointer device comprising: transmitting means for transmitting illuminance information including the position coordinates in the opposite direction and the average illuminance measured by the measuring means to the projection device. Further comprising calculation means for calculating position coordinates and average illuminance from the illuminance information measured by the measuring means,
14. The pointer device according to claim 13, wherein the transmission unit transmits information on the position coordinates and average illuminance calculated by the calculation unit. The receiving means receives an instruction as to whether or not to adjust the brightness of the position detection image set on the projection device side;
15. The pointer device according to claim 14, wherein when the instruction to adjust the brightness of the position detection image is received by the receiving means, the average illuminance is calculated by the calculating means. Further comprising setting means for setting whether or not to adjust the brightness of the position detection image in cooperation with the projection device;
15. The pointer device according to claim 14, wherein when the setting unit is set to adjust the brightness of the position detection image, the calculation unit calculates the average illuminance.   A projection system comprising the projection device according to any one of claims 1 to 12 and the pointer device according to any one of claims 13 to 16.

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