JP2009092801A - Projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projector which is capable of easily suppressing the reduction of visibility due to overlap between a projected image and a drawing picture written by a hand. <P>SOLUTION: When a mask key is operated, a control part divides an input image Gi into 12 (4×3) areas and makes a user designate one of the plurality of divided areas. The user can designate a desired area by using a direction key to move a cursor C displayed on the input image Gi. When a determination key is operated after user's designating one area, the control part performs mask processing of erasing an image included in this area. In the case that the projector projects the input image Gi to a writable projection surface S like a white board, a drawing picture (characters, graphics, and the like to be written) is written into the masked area to avoid overlap between the projected image (input image Gi) projected from the projector and the drawing picture. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a projector that projects an image according to an input image signal.

  In recent years, presentations using projectors have become common, and it has become possible to explain while showing images projected on a screen or whiteboard. As shown in Patent Document 1, when an image is projected on a whiteboard instead of a screen, an explanation based on the projected image (hereinafter referred to as a projected image) and a handwritten figure or character (hereinafter referred to as a written image). It is possible to make an explanation using the same place at the same place, so that the convenience of the explainer is improved.

Japanese Patent Laid-Open No. 11-305335

  However, when it is desired to display the projected image and the written image at the same time, if the written image is written so as to overlap the projected image, one or both of the images may be difficult to see. In this case, it is necessary to write the written image outside the projected image. However, if there is not enough space (margin area) on the whiteboard, the position of the projected image with respect to the whiteboard is shifted, or the projected image is reduced. For example, it is necessary to perform an operation for securing a blank area. In order to shift the position of the projected image with respect to the whiteboard, the projector or the whiteboard must be moved, which is cumbersome work. It will also be necessary to restore it. Further, when the projected image is reduced, there is a problem that visibility is deteriorated because the projected image becomes smaller.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.

  Application Example 1 A projector according to this application example includes an image signal input unit that receives an image signal from the outside, an image projection unit that projects an image based on the image signal input to the image signal input unit, An area designating unit for designating a partial area of the image, and a mask unit for masking the area designated by the area designating unit and erasing an image included in the area And

  According to this projector, since the mask portion masks a part of the image, when projecting an image on a writable surface such as a whiteboard, an area for writing the image by handwriting is provided in the projected image. Is possible. As a result, when both the image based on the image signal and the image written by handwriting are shown, it is possible to easily suppress a decrease in visibility due to the overlapping of both.

  Application Example 2 In the projector according to the application example, it is preferable that the area designating unit divides the image based on the image signal into a plurality of areas and selects a desired area from the plurality of areas.

  According to this projector, since a desired area is selected from a plurality of divided areas, it is possible to easily specify an area to be masked.

  Application Example 3 In the projector according to the application example, the area specifying unit includes a plurality of operation keys corresponding to the plurality of areas, respectively, and allows the area to be specified by operating the operation keys. desirable.

  According to this projector, the area specifying unit has a plurality of operation keys corresponding to the plurality of divided areas, and the area to be masked is further specified by operating the operation keys. It can be easily performed.

  Application Example 4 In the projector according to the application example described above, it is preferable that the mask unit can simultaneously mask a plurality of the regions.

  According to this projector, since a plurality of areas can be masked simultaneously, the degree of freedom of the size of the area to be masked increases.

  Application Example 5 In the projector according to the application example described above, it is preferable that the projector further includes a mask canceling unit that cancels the masking of the region specified by the region specifying unit.

  According to this projector, since the mask can be released by designating the already masked area, the area to be masked can be easily changed.

(First embodiment)
Hereinafter, a projector that projects an image based on an image signal input from the outside (hereinafter referred to as an input image) and displays the input image on a projection surface such as a screen or a whiteboard will be described. The projector according to the present embodiment can divide the input image into a plurality of areas, mask an area specified by the user from the plurality of divided areas, and erase an image included in the area. It has become.

FIG. 1 is a block diagram illustrating a schematic configuration of a projector according to the present embodiment.
As shown in FIG. 1, the projector 1 includes an image projection unit 10, a control unit 20, a storage unit 21, an operation panel 22, a remote controller 23, an operation signal reception unit 24, an image signal input unit 25, an image processing unit 26, and an OSD process. It consists of part 27 grade | etc.,.

  The image projection unit 10 includes a light source 11, three liquid crystal light valves 12R, 12G, and 12B as light modulation devices, a projection lens 13 as a projection optical system, a light valve drive unit 14, and the like. The image projection unit 10 corresponds to a display unit, modulates the light emitted from the light source 11 with the liquid crystal light valves 12R, 12G, and 12B, forms an image, and projects the image from the projection lens 13. Displayed on the projection surface S.

  The light source 11 includes a discharge-type light source lamp 11a made of an ultra-high pressure mercury lamp, a metal halide lamp, or the like, and a reflector 11b that reflects light emitted from the light source lamp 11a toward the liquid crystal light valves 12R, 12G, and 12B. ing. Light emitted from the light source 11 is converted into light having a substantially uniform luminance distribution by an integrator optical system (not shown), and red (R), green (G), and blue, which are the three primary colors of light, by a color separation optical system (not shown). After being separated into each color light component of (B), it enters the liquid crystal light valves 12R, 12G, and 12B, respectively.

  The liquid crystal light valves 12R, 12G, and 12B are configured by a liquid crystal panel in which liquid crystal is sealed between a pair of transparent substrates. The liquid crystal light valves 12R, 12G, and 12B are formed with a plurality of pixels arranged in a matrix, and a driving voltage can be applied to the liquid crystal for each pixel. When the light valve driving unit 14 applies a driving voltage corresponding to the input image signal to each pixel, each pixel is set to a light transmittance corresponding to the image signal. Therefore, the light emitted from the light source 11 is modulated by transmitting through the liquid crystal light valves 12R, 12G, and 12B, and image light (image) corresponding to the image signal is formed for each color light. The formed image light of each color is synthesized for each pixel by a color synthesis optical system (not shown) to become color image light, and then enlarged and projected onto the projection plane S by the projection lens 13.

  The control unit 20 includes a CPU (Central Processing Unit), a RAM (Random Access Memory) used for temporary storage of various data, and the like, and operates according to a control program stored in the storage unit 21 to operate the projector 1. Centrally control the operation. That is, the control unit 20 functions as a computer together with the storage unit 21.

  The storage unit 21 includes a non-volatile memory such as a mask ROM (Read Only Memory), a flash memory, or an FeRAM (Ferroelectric RAM). The storage unit 21 stores a control program for controlling the operation of the projector 1, various setting data for defining operation conditions of the projector 1, and the like.

  The operation panel 22 and the remote controller 23 correspond to an input operation unit that receives an input operation from the user, and include a plurality of operation keys for the user to give various instructions to the projector 1. The operation keys provided on the operation panel 22 and the remote controller 23 include a “power key” for switching power on / off, a “menu key” for displaying a menu image for performing various settings, selection of an item in the menu image, and the like. "Direction keys" (four keys corresponding to the top, bottom, left and right) used in the menu, "Determine key" to determine the item selected in the menu image, etc., "Cancel key" to instruct to cancel the operation, and area mask There is a “mask key” and the like. When the user operates various operation keys on the operation panel 22, the operation panel 22 outputs an operation signal corresponding to the operation content of the user to the control unit 20. When the user operates various operation keys of the remote controller 23, the remote controller 23 emits an infrared operation signal corresponding to the user's operation content, and the operation signal receiving unit 24 receives this and transmits it to the control unit 20.

  The image signal input unit 25 includes a connection terminal (not shown) for connecting to an external image output device (not shown) such as a personal computer or a DVD (Digital Versatile Disc) playback device via a cable. Various types of image signals are input from the image output device. The image signal input unit 25 outputs the input image signal to the image processing unit 26.

  The image processing unit 26 generates image information representing the gradation of each pixel of the liquid crystal light valves 12R, 12G, and 12B based on various types of image signals sequentially input from the image signal input unit 25. Here, the generated image information is for each color light of R, G, and B, and is configured by a plurality of pixel values corresponding to all the pixels of the liquid crystal light valves 12R, 12G, and 12B. The pixel value determines the light transmittance of the corresponding pixel, and the intensity (gradation) of light emitted from each pixel is defined by the pixel value. Further, the image processing unit 26 performs image quality adjustment processing for adjusting brightness, contrast, sharpness, hue, and the like on the generated image information based on an instruction from the control unit 20, and finishes all processing. The image information is sequentially output to the OSD processing unit 27.

  Further, the image processing unit 26 can mask a part of the input image based on an instruction from the control unit 20 and erase an image included in this region. Specifically, when the control unit 20 outputs region information that can specify a region to be masked (mask region) to the image processing unit 26, the image processing unit 26 displays all the pixels included in the mask region. The image information is corrected so that the light transmittance is minimized. That is, the image processing unit 26 generates image information in which pixel values corresponding to all the pixels included in the mask area are set to the minimum value (0), and outputs this image information to the OSD processing unit 27.

  The OSD processing unit 27 performs processing for superimposing an OSD (on-screen display) image such as a menu image or a message image on the input image based on an instruction from the control unit 20. In the present embodiment, the boundary line when the input image is divided into a plurality of regions is also displayed using the OSD image. The OSD processing unit 27 includes an OSD memory (not shown), and stores OSD image information representing graphics, fonts, and the like for forming an OSD image. When the control unit 20 instructs to superimpose the OSD image, the OSD processing unit 27 reads out necessary OSD image information from the OSD memory and superimposes the OSD image on a predetermined position of the input image. The OSD image information is synthesized with the image information input from the. The image information combined with the OSD image information is output to the light valve driving unit 14. When there is no instruction to superimpose the OSD image from the control unit 20, the OSD processing unit 27 outputs the image information output from the image processing unit 26 to the light valve driving unit 14 as it is.

  When the light valve driving unit 14 drives the liquid crystal light valves 12R, 12G, and 12B according to the image information input from the OSD processing unit 27, the liquid crystal light valves 12R, 12G, and 12B form images according to the image information, This image is projected from the projection lens 13 onto the projection surface S.

Next, the operation of the projector 1 according to this embodiment will be described.
While the projector 1 (image projection unit 10) projects an input image corresponding to the image signal, the control unit 20 monitors an input operation on the operation panel 22 or the remote controller 23. Then, when an operation key provided on the operation panel 22 or the remote controller 23 is operated by the user, the control unit 20 performs an operation corresponding to the operated operation key.

  Here, when the mask key is operated, the control unit 20 divides the input image into a plurality of areas, and allows the user to specify any one of the divided areas. When an area is designated by the user, the control unit 20 performs either a mask process for erasing an image included in this area or a mask release process for canceling the mask of an already masked area. ing. The storage unit 21 stores mask information for identifying whether each divided area is in a masked state or an unmasked state (a state in which the mask is released). The control unit 20 updates the mask information after performing the mask process and the mask release process.

  FIG. 2 is a flowchart showing details of the operation of the projector when the mask key is operated, and FIG. 3 is an explanatory diagram for explaining the operation of the projector when the mask key is operated. FIGS. 4A to 4E, FIGS. 5A to 5C, FIG. 6, and FIG. 7 are explanatory diagrams for explaining specific examples of the operation of the projector. When the operation panel 22 or the remote controller 23 accepts the operation of the mask key, the control unit 20 operates according to the flow shown in FIG. It is assumed that the input image Gi shown in FIG. 4A is projected on the projection surface S until immediately before the mask key is operated.

  As shown in FIG. 2, in step S101, the control unit 20 divides the input image Gi into a plurality of regions. Specifically, the control unit 20 instructs the OSD processing unit 27 to set the boundary line L that divides the input image Gi into 12 4 × 3 areas A1 to A12 (see FIG. 3) on the input image Gi. Is displayed in a superimposed manner.

  In subsequent step S102, the control unit 20 instructs the OSD processing unit 27 to set the processing target on the periphery (on the boundary line L) of one region (for example, the region A1) among the plurality of divided regions. A frame-like cursor C indicating the area is displayed in a superimposed manner (see FIG. 4B).

  In step S103, the control unit 20 determines whether or not the operation panel 22 or the remote controller 23 has accepted an operation of a direction key, that is, whether or not any of the up, down, left, and right direction keys has been operated by the user. As a result, when the direction key is operated, the process proceeds to step S104, and when the direction key is not operated, the process proceeds to step S105.

  When the direction key is operated and the process proceeds to step S104, the control unit 20 instructs the OSD processing unit 27 to move the cursor C according to the operated direction key, and returns to step S103. For example, when the right direction key is operated in a state where the cursor C is in the upper left corner area A1 of the input image Gi, the cursor C is moved to the area A2 adjacent to the right (see FIG. 4C). When the down direction key is operated while the cursor C is in the area A1, the cursor C is moved to the area A5 adjacent below. If the up direction key or the left direction key is operated while the cursor C is in the area A1, that is, if the direction key is operated in a direction in which there is no adjacent area, the process is performed without performing any processing. Return to S103.

  As described above, by repeating Step S103 and Step S104, the user can move the cursor C to a desired area among the 12 areas A1 to A12, and processing is performed by moving the cursor C. The area to be targeted can be specified.

  When the direction key is not operated in step S103 and the process proceeds to step S105, the control unit 20 determines whether or not the operation panel 22 or the remote controller 23 accepts the operation of the determination key, that is, whether the determination key is operated by the user. Judge whether or not. As a result, when the enter key is operated, the process proceeds to step S106, and when the enter key is not operated, the process returns to step S103.

  When the enter key is operated and the process proceeds to step S106, the control unit 20 reads the mask information from the storage unit 21, and the area designated by the cursor C is already masked or masked. Judge whether it is not in the state. As a result, if not masked, the process proceeds to step S107, and if masked, the process proceeds to step S108.

  If the designated area is not masked and the process proceeds to step S107, the control unit 20 outputs area information that can specify the designated area to the image processing unit 26, and performs mask processing on the area. To the image processing unit 26. Upon receiving this instruction, the image processing unit 26 sets the pixel value of the pixel included in the region specified by the region information to the minimum value in the image information generated thereafter. As a result, the image included in the area designated by the cursor C is erased (see FIG. 4D). As the area information, for example, coordinate values of two pixels located at the diagonal of the area can be used, but the information is not limited to this as long as the position and size of the area can be specified.

  On the other hand, as shown in FIG. 5A, when the area designated by the cursor C is an area already masked and the process proceeds to step S108, the control unit 20 can identify the designated area. The region information is output to the image processing unit 26, and the image processing unit 26 is instructed to perform mask release processing on the region. Upon receiving this instruction, the image processing unit 26 uses the pixel values of the pixels included in the region specified by the region information in the image information generated thereafter based on the image signal input from the image signal input unit 25. Set to pixel value. As a result, an image corresponding to the image signal is displayed in the area designated by the cursor C (see FIG. 5B).

  When the process proceeds to step S109 via step S107 or step S108, the control unit 20 updates the mask information read in step S106 according to the mask process in step S107 or the mask release process in step S108, and the updated mask. Information is stored in the storage unit 21.

  In subsequent step S110, the control unit 20 instructs the OSD processing unit 27 to end the superimposed display of the boundary line L and the cursor C (see FIG. 4E and FIG. 5C), and ends the flow. To do.

  Since the projector 1 of the present embodiment operates as described above, the user designates a desired area after operating the mask key, thereby masking the area and erasing a part of the input image Gi. It can be in the state. If an area that has already been subjected to mask processing is designated after operating the mask key, the mask of the area can be released and the state where the input image Gi is displayed can be restored.

  The projector 1 can also mask a plurality of areas at the same time. For example, after masking the area A2 by the procedure shown in FIGS. 4A to 4E, if the area A3 is designated by operating the mask key again, as shown in FIG. The images included in the areas A2 and A3 are erased.

  Further, as shown in FIG. 7, when the projector 1 projects an input image Gi on a writable projection surface S such as a whiteboard WB, a written image Gh (characters or figures to be written) Is written in the masked area, the projected image (input image Gi) projected from the projector 1 and the written image Gh do not overlap each other.

As described above, according to the projector 1 of the present embodiment, the following effects can be obtained.
(1) According to the projector 1 of the present embodiment, since a partial area of the projected input image Gi can be masked, an image is projected onto a writable projection surface S such as a whiteboard WB. At this time, it is possible to provide an area for writing the handwritten image Gh in the projection image (input image Gi). As a result, when both the input image Gi and the written image Gh are shown, it is possible to easily suppress a decrease in visibility due to the overlapping of both.

  (2) According to the projector 1 of the present embodiment, when a region to be masked is specified, a desired region is selected from the plurality of divided regions A1 to A12. It can be easily performed.

  (3) According to the projector 1 of the present embodiment, since the mask is released when the designated area is already masked, it is possible to easily change the area to be masked.

  In this embodiment, in steps S101 to S104, the control unit for dividing the input image Gi into a plurality of areas and moving the cursor C according to the operation of the direction key by the user to designate the area to be masked. 20, the OSD processing unit 27, the operation panel 22 and the remote controller 23 correspond to an area specifying unit. In step S107, the control unit 20 and the image processing unit 26 for performing mask processing on the designated area correspond to a mask unit. In step S108, the control unit for performing mask release processing on the designated area. 20 and the image processing unit 26 correspond to a mask release unit.

(Second Embodiment)
Hereinafter, a projector according to a second embodiment will be described with reference to the drawings.
In the first embodiment, the cursor C is moved with the direction keys provided on the operation panel 22 and the remote controller 23 to designate the area to be masked or masked. On the other hand, in the present embodiment, the remote controller 23 has operation keys corresponding to the divided areas A1 to A12 on a one-to-one basis, and it is possible to directly designate an area by operating these operation keys. It is possible. Other configurations are the same as those in the first embodiment.

FIG. 8 is a plan view showing the remote controller 23 of the projector 1 according to the present embodiment.
As shown in FIG. 8, the remote controller 23 of this embodiment includes a power key 41, a menu key 42, four direction keys 43, an enter key 44, a cancel key 45, and a mask key 46, as in the first embodiment. In addition, there are many other operation keys. Here, 12 operation keys (including the menu key 42) are arranged in a 4 × 3 matrix in a region K surrounded by a broken line in the drawing. These twelve operation keys are assigned independent functions, and function as area designation keys for designating areas when the mask key is operated.

  The 12 operation keys included in the area designation key are associated with the 12 areas A1 to A12 of the input image Gi according to the position. For example, the operation key at the upper left corner of the area designation key is operated. By doing so, it is possible to specify the area A1 which is the upper left corner area of the input image Gi.

  FIG. 9 is a flowchart showing an operation when the mask key is operated in the projector 1 according to the present embodiment. FIGS. 10A to 10D are diagrams for explaining specific examples of the operation of the projector. It is explanatory drawing of. When the remote controller 23 accepts the operation of the mask key, the control unit 20 operates according to the flow shown in FIG. It is assumed that the input image Gi shown in FIG. 10A is projected on the projection surface S until immediately before the mask key is operated.

  9, in step S201, the control unit 20 instructs the OSD processing unit 27 to divide the input image Gi into 12 4 × 3 areas A1 to A12 (see FIG. 3). L is superimposed on the input image Gi (see FIG. 10B).

  In subsequent step S202, the control unit 20 determines whether or not the remote controller 23 has accepted the operation of the area designation key, that is, whether or not any of the area designation keys has been operated by the user. As a result, when the area designation key is operated, the process proceeds to step S203, and when the area designation key is not operated, the process proceeds to step S207.

  When the region designation key is operated and the process proceeds to step S203, the control unit 20 reads the mask information from the storage unit 21, and the region designated by the region designation key is in a masked state or is masked. It is determined whether it is not in a state. As a result, if not masked, the process proceeds to step S204. If masked, the process proceeds to step S205.

  If the designated area is not masked and the process proceeds to step S204, the control unit 20 outputs area information that can identify the designated area to the image processing unit 26, and performs mask processing on the area. To the image processing unit 26. Upon receiving this instruction, the image processing unit 26 sets the pixel value of the pixel included in the region specified by the region information to the minimum value in the image information generated thereafter. As a result, the image included in the area designated by the area designation key is deleted (see FIG. 10C).

  On the other hand, when the area designated by the area designation key is already masked and the process proceeds to step S205, the control unit 20 sends area information that can identify the designated area to the image processing unit 26. In addition to outputting, the image processing unit 26 is instructed to perform mask release processing on this area. Upon receiving this instruction, the image processing unit 26 uses the pixel values of the pixels included in the region specified by the region information in the image information generated thereafter based on the image signal input from the image signal input unit 25. Set to pixel value. As a result, an image corresponding to the image signal is displayed in the area designated by the area designation key (not shown).

  When the process proceeds to step S206 via step S204 or step S205, the control unit 20 updates the mask information read in step S203 according to the mask process in step S204 or the mask release process in step S205, and the updated mask. Information is memorize | stored in the memory | storage part 21, and it returns to step S202.

  When the region designation key is not operated in step S202 and the process proceeds to step S207, the control unit 20 determines whether or not the remote controller 23 accepts the determination key operation, that is, whether or not the determination key is operated by the user. to decide. As a result, when the enter key is operated, the process proceeds to step S208, and when the enter key is not operated, the process returns to step S202.

  In step S208, the control unit 20 instructs the OSD processing unit 27 to end the superimposed display of the boundary line L (see FIG. 10D), and ends the flow.

  Since the projector 1 of the present embodiment operates as described above, the user simply operates the area designation key corresponding to the desired area after operating the mask key, and the mask process and the mask release process for the area are performed. Can be performed. In addition, after performing mask processing and mask release processing on one area, the process returns to step S202 to accept the operation of the area designation key again. Therefore, once the mask key is operated, a plurality of areas are stored. On the other hand, it is possible to perform a mask process and a mask release process, or to perform a mask process and a mask release process on one area continuously.

As described above, according to the projector 1 of the present embodiment, the following effects can be obtained in addition to the effects of the first embodiment.
According to the projector 1 of the present embodiment, the remote controller 23 has a plurality of operation keys (area designation keys) corresponding to the divided areas A1 to A12 on a one-to-one basis, and operates these operation keys. Thus, since the area to be masked is designated, the area can be designated more easily.

  In the present embodiment, in steps S201 and S202, the control unit 20, the OSD processing unit 27, and the like when the input image Gi is divided into a plurality of regions and the region to be masked is designated by the operation of the region designation key by the user. The remote controller 23 corresponds to an area specifying unit. In step S204, the control unit 20 and the image processing unit 26 for performing mask processing on the designated area correspond to a mask unit. In step S205, the control unit for performing mask removal processing on the designated area. 20 and the image processing unit 26 correspond to a mask release unit.

(Modification)
In addition, you may change the said embodiment as follows.
In the first and second embodiments, when a partial area of the input image Gi is masked, the light transmittance of all the pixels included in this area is minimized. It is not limited. For example, white light may be projected into the region so that the light transmittance of all the pixels is maximized, or other color light may be projected. However, in order not to reduce the visibility of the written image Gh, it is desirable that the area is plain. In addition, the brightness and color scheme of the masked area may be set according to the usage conditions such as the ambient brightness, the reflectance of the projection surface S, and the color of the writing image Gh.

  In the second embodiment, the remote controller 23 is configured to include the area designation key. However, the operation panel 22 may include the area designation key.

  In the above-described embodiment, the transmissive liquid crystal light valves 12R, 12G, and 12B are used as the light modulator. However, it is also possible to use a reflective light modulator such as a reflective liquid crystal light valve. Also, a micromirror array device that modulates the light emitted from the light source 11 by controlling the emission direction of the incident light for each micromirror as a pixel can be used.

  In the embodiment, the light source 11 is constituted by the discharge-type light source lamp 11a. However, a solid light source such as an LED (Light Emitting Diode) light source or other light sources may be used.

1 is a block diagram showing a schematic configuration of a projector according to a first embodiment. 6 is a flowchart showing details of the operation of the projector when a mask key is operated in the first embodiment. Explanatory drawing for demonstrating operation | movement of the projector when a mask key is operated in 1st Embodiment. (A)-(e) is explanatory drawing for demonstrating the specific example of operation | movement of the projector which concerns on 1st Embodiment. (A)-(c) is explanatory drawing for demonstrating the specific example of operation | movement of the projector which concerns on 1st Embodiment. Explanatory drawing for demonstrating the specific example of operation | movement of the projector which concerns on 1st Embodiment. Explanatory drawing for demonstrating the specific example of operation | movement of the projector which concerns on 1st Embodiment. The top view which shows the remote control of the projector which concerns on 2nd Embodiment. 10 is a flowchart showing the operation of the projector when a mask key is operated in the second embodiment. (A)-(d) is explanatory drawing for demonstrating the specific example of operation | movement of the projector which concerns on 2nd Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Projector, 10 ... Image projection part, 11 ... Light source, 12R, 12G, 12B ... Liquid crystal light valve, 13 ... Projection lens, 14 ... Light valve drive part, 20 ... Control part, 21 ... Memory | storage part, 22 ... Operation panel , 23 ... remote control, 24 ... operation signal receiving section, 25 ... image signal input section, 26 ... image processing section, 27 ... OSD processing section, A1 to A12 ... area, Gi ... input image, Gh ... written image, C ... cursor , L: boundary line, S: projection surface, WB: whiteboard.

Claims (5)

An image signal input unit for inputting an image signal from the outside;
An image projection unit that projects an image based on the image signal input to the image signal input unit;
An area designating unit for designating a partial area of the image;
Masking the area specified by the area specifying unit, and erasing the image included in the area; and
A projector comprising: The projector according to claim 1,
The area specifying unit divides an image based on the image signal into a plurality of areas, and causes a desired area to be selected from the plurality of areas. The projector according to claim 2,
The area designating unit includes a plurality of operation keys respectively corresponding to the plurality of areas, and the area is designated by operating the operation keys. The projector according to claim 2 or 3,
The projector according to claim 1, wherein the mask unit is capable of simultaneously masking a plurality of the regions. The projector according to any one of claims 1 to 4,
The projector further comprising: a mask canceling unit that cancels the masking of the region specified by the region specifying unit when the region specified by the region specifying unit is already masked.

Images