JP3769568B2 - Projector having an image sensor with a spectrum selection mechanism - Google Patents

Description

  The present invention relates to a projector having an image sensor with a spectrum selection mechanism.

  Referring to FIG. 3 showing the configuration of a conventional projector with an imaging device, this projector is a projector that projects an image from a projection tube onto a screen provided separately, and receives light from the light source 11 and receives an image. , A spectroscope 15 that passes an image from the display element 12, an enlargement / reduction optical system 13 that optically enlarges the image from the spectroscope 15, and an image of the enlargement / reduction optical system 13 , The image pickup device 16 that captures the image on the screen 14 through the spectroscope 15, and the light beam pointer (pointer display of a desired position on the screen 14). The laser pointer) 17 and the image from the display element 12 and the image pickup from the image pickup element 16 are compared to extract the difference, and the absolute pointer display on the screen 14 is displayed. Identify target, and a difference extraction and calculation unit 18 for outputting the coordinate output section of the personal computer converts the absolute coordinates into relative coordinates (for example, see Patent Document 1).

  The difference extraction / arithmetic unit 18 captures an image captured through a spectroscope 15 via a display image storage area for storing an image from a display element that has received an image input, an enlargement / reduction optical system 13 from a screen, and the like. An imaging storage area captured from the element 16, a comparison operation unit that captures an image of the display image storage area and an image of the imaging storage area, extracts a difference, and specifies absolute coordinates, and a comparison operation with coordinates stored in a separate coordinate storage area A coordinate system converter for taking a difference from the absolute coordinate from the container and converting the absolute coordinate to the relative coordinate.

  Further, it is possible to directly output from the comparison computing unit to the coordinate input unit of the personal computer without converting the absolute coordinates into relative coordinates by the coordinate system converter.

  In this conventional example, in a projector that prepares a screen separately and projects it, an optical coordinate input detection function is added to the projector itself, so that an expensive screen laid with conventional sensors becomes unnecessary, The pointer can be easily displayed with a commonly used laser pointer, which is very effective for presentations and the like.

JP 2003-76494 A (page 2-4, FIG. 3)

  As shown in FIG. 4, many image sensors mounted on a conventional projector are called a Bayer array. In this Bayer array, even-numbered lines are arranged in green, red, green and red, and odd-numbered lines are arranged in blue, green, and green, and the pixels are arranged.

  For example, in order to acquire the coordinates of the infrared light pointer, a red photographing pixel is used. However, because of the characteristics of the Bayer array, the red pixel has only a quarter of the resolution of the image pickup device, and the coordinate acquisition is accurate. There is a problem that it is too low.

  An object of the present invention is to provide a coordinate input means represented by an infrared light pointer using an invisible light portion of a color filter and a spectrum selection mechanism capable of performing infrared test pattern photography used for automatic distortion correction. The object is to provide a projector having an image sensor.

  Another object of the present invention is to provide a projector having an image sensor with a spectrum selection mechanism that is used when a projected image or a handwritten image is captured using the red, green, and blue portions of a color filter.

  Furthermore, the object of the present invention is to limit the spectrum of light entering the image sensor with color filters of red, green, blue and invisible light, and by using a monochrome image sensor for the image sensor itself, red, green, blue, An object of the present invention is to provide a projector having an image pickup device with a spectrum selection mechanism that can extract the resolution of the image pickup device with all invisible light.

A projector having an image pickup device with a spectrum selection mechanism according to the present invention is a projector having an image pickup device, a color filter including red, green, blue, and invisible light filters for selecting an incident light spectrum to the image pickup device, and a plurality of colors. A selection mechanism that selects one color filter from the filter and a control unit that controls the selection mechanism are provided.

  In the projector having the imaging device with a spectrum selection mechanism according to the present invention, the color filter may be a red, green, blue, or invisible light filter.

  Furthermore, the projector having an imaging device with a spectrum selection mechanism according to the present invention is characterized in that the color filter is a circular filter obtained by dividing a red, green, blue, and invisible light filter into four rotation center angles.

  Furthermore, in the projector having an image pickup device with a spectrum selection mechanism according to the present invention, the invisible light portion of the color filter is selected when a coordinate input unit represented by an infrared light pointer is used. .

  Furthermore, the projector having an image pickup device with a spectrum selection mechanism according to the present invention is characterized in that the invisible light portion of the color filter is selected at the time of photographing an infrared test pattern used for automatic distortion correction.

  Furthermore, the projector having an image sensor with a spectrum selection mechanism according to the present invention is characterized in that the red, green, and blue portions of the color filter are used when a projected image or a handwritten image is captured.

Furthermore, it is preferable that the projector having the image pickup device with the spectrum selection mechanism of the present invention is configured such that the image pickup device is a monochrome image pickup device .

  As described above, according to the present invention, there is an effect that it is possible to use the electronic pen for both coordinate capture and video shooting by switching the filter. Secondary, by switching the primary color filter, it is possible to obtain a photographic image with higher resolution than a general digital camera image sensor.

  Next, embodiments of the present invention will be described in detail with reference to the drawings.

  Referring to FIG. 1 showing an embodiment of the present invention in (a) a front view and (b) a side view, a projector having an imaging element with a spectrum selection mechanism of this embodiment includes a projector 1 having a projection lens 2. A four-division color filter 3 that selects the light spectrum incident on the image sensor 4, a servo motor that is a selection mechanism 5 that selects one color filter from the four-division color filter 3, and a control that controls the selection mechanism 5 Part 6.

  Referring to FIG. 1, a servo motor which is a four-division color filter 3, an image sensor 4, and a selection mechanism 5 attached to the projector 1 is controlled by a control unit 6.

  Referring to FIG. 2, which is a flowchart showing an example of the operation of this embodiment, in normal times, the control unit 6 controls the servo motor which is the selection mechanism 5 so that the invisible light portion of the four-division color filter 3 is selected. At this time, invisible light is incident on the image sensor 4 (S11). In this state, it is used for acquiring the coordinates of the infrared light pointer and correcting the distortion by the infrared light test pattern (S12).

  When the user intends to capture a projected image (S13), first, the control unit 6 controls the servo motor as the selection mechanism 5 so that the red portion of the four-division color filter 3 is selected (S21). 4 acquires the red component of the image (S22). Next, the control unit 6 controls the servo motor that is the selection mechanism 5 so that the green portion of the four-division color filter 3 is selected (S23), and the image sensor 4 acquires the green component of the image (S24). Finally, the control unit 6 controls the servo motor that is the selection mechanism 5 so that the blue portion of the four-division color filter 3 is selected (S25), and the image sensor 4 acquires the blue component of the image (S26). Thereafter, the control unit 6 combines the red, blue, and green components of the image and outputs a natural color image (S27). This projection image capturing operation is completed in less than 1 second, and does not bother the user.

  The above-described projection image capturing operation is used, for example, to capture an image written with a board marker on a whiteboard into a projector.

  As a possible application of a projector having an image pickup device with a spectrum selection mechanism, it is conceivable to project an image of a personal computer toward a white board and write a portion of the personal computer image that is not sufficient on the white board with a board marker. At this time, what is written on the whiteboard with a board marker must be handwritten. In order to solve this problem, the present invention captures the writing as an image using an image sensor.

  In addition to the above-mentioned applications, when an electronic pen or a laser pointer whose pen tip is made of a light emitting diode is used, it can be used to capture where the bright spot is.

  By limiting the spectrum of light entering the image sensor with red, green, blue, and invisible light color filters, and using a monochrome image sensor for the image sensor itself, all of red, green, blue, and invisible light You can also increase the resolution.

  At this time, red, green, and blue are not photographed at the same time, but there is no problem because the projected image capturing in the electronic blackboard function is intended to capture a still image. Invisible light is normally selected, and a moving object such as an infrared light pointer can be captured in real time.

It is a block diagram which shows the structure of one embodiment of this invention. It is a flowchart which shows an example of the operation | movement in this embodiment. It is a block diagram of a prior art example. It is a figure which shows the Bayer array example in the conventional image sensor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Projector 2 Projection lens 3 Four division | segmentation color filter 4 Image pick-up element 5 Selection mechanism 6 Control part

Claims (6)

In a projector having an image sensor, a color filter composed of red, green, blue, and invisible light filters for selecting an incident light spectrum to the image sensor , and a selection mechanism for selecting one color filter from the plurality of color filters; And a control unit that controls the selection mechanism. A projector having an imaging device with a spectrum selection mechanism.   2. The projector having an image pickup device with a spectrum selection mechanism according to claim 1, wherein the color filter is a circular filter having a rotation center angle divided into four. The invisible light portion of the color filter, a projector having a spectrum selection mechanism with an imaging device according to claim 1 or 2, wherein the selected when using the coordinate input unit exemplified in infrared light pointer . The invisible light portion of the color filter, a projector having a spectrum selection mechanism with an imaging device according to claim 1 or 2, wherein the selected at infrared test pattern imaging to be used when the automatic distortion correction. The red, green, and blue portions of the color filter, a projector having a spectrum selection mechanism with an imaging device according to claim 1 or 2, wherein the to be used when the projected image or the handwritten image capture. 3. The projector having an image sensor with a spectrum selection mechanism according to claim 1, wherein the image sensor is a monochrome image sensor .

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