JP2006349792A - Projector, image processing method for projector and image processing program for projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projector capable of easily attaining satisfactory color reproduction even in various kinds of viewing environment, and achieving the shortening of adjusting time taken until it can be used, and the reduction of manufacture cost. <P>SOLUTION: The projector is equipped with: a projection optical unit to project a projected image to a projection surface in accordance with input image information; a plurality of color conversion tables prepared corresponding to every predetermined wall color; a color light sensor to measure the level of each color on the projection surface to which the projected image being a reference is projected; a color conversion table selection means to decide the wall color of the projection surface based on the level of each color measured by the color light sensor and select any of the plurality of color conversion tables based on the wall color; and a color conversion device to correct the input image information based on the color conversion table selected by the color conversion table selection means. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a projector, an image processing method in the projector, and an image processing program in the projector.

  When performing color display using a projector, various viewing environments (for example, viewing environments in which the wall of the projection surface is colored, viewing environments in which bright light is irradiated on the screen of the projection surface, etc.) )) Has also been proposed (see, for example, Non-Patent Document 1 and Patent Document 1).

  Among these, in the projector described in Non-Patent Document 1, by selecting an appropriate wall color manually from the wall color correction selection menu, it is determined in advance according to the wall color (corresponding to the viewing environment described above). Any one of the seven types of color conversion is performed. For this reason, according to the projector described in Non-Patent Document 1, since appropriate color conversion is performed according to the wall color (viewing environment), good color reproduction is possible even in various viewing environments.

Further, in the projector described in Patent Document 1, a color light obtained by projecting a reference projection image on a screen under an actual viewing environment and measuring the hue of the projection image using a color light sensor. From the information, an RGB input / output characteristic profile under an actual visual environment is created. For this reason, according to the projector described in Patent Document 1, color conversion of input image data can be performed based on an RGB input / output characteristic profile under an actual viewing environment. Better color reproduction is possible.
NEC View Technology Co., Ltd. Projector General Catalog May 2005 (wall color correction function description column) JP 2001-320725 A

  However, in the projector described in Non-Patent Document 1, every time the projector is placed in a different viewing environment, it is necessary for the user to manually select the wall color from the wall color correction selection menu every time. At the same time, there is a problem that good color reproduction is not always easy because the user's allegiance is involved in the adjustment work.

  In the projector described in Patent Document 1, an RGB input / output characteristic profile is created from a large amount of color light information obtained by measuring the hue of a reference projection image for each predetermined gradation unit. In this case, since complicated matrix calculation is required, it takes time to create the RGB input / output characteristic profile, and there is a problem that adjustment time until the projector is used becomes long. In addition, since a complicated matrix operation is required when creating an RGB input / output characteristic profile from an enormous amount of color light information, there is a problem that expensive CPU resources are required and the manufacturing cost increases.

  Therefore, the present invention has been made to solve such problems, and it is easy to perform good color reproduction in various viewing environments, adjustment time until use is short, and manufacturing. An object is to provide a low-cost projector. It is another object of the present invention to provide an image processing method and an image processing program for performing good color reproduction using such a projector.

(1) A projector of the present invention includes a projection optical unit that projects a projection image on a projection surface according to input image information, a plurality of color conversion tables prepared for each predetermined wall color, a reference, A color light sensor that measures the level of each color on the projection surface on which the projection image is projected, and a wall color of the projection surface is determined based on the level of each color measured by the color light sensor, and based on the wall color A color conversion table selection device that selects any one of the plurality of color conversion tables, and correction of the input image information based on the color conversion table selected by the color conversion table selection device. And a color conversion device.

  Therefore, according to the projector of the present invention, it is possible to eliminate the user's arbitrary intention by automatically correcting the input image information based on the color light information obtained by measuring the reference projection image using the color light sensor. Therefore, it is easy to perform good color reproduction even in various viewing environments.

  Further, according to the projector of the present invention, any one of a plurality of color conversion tables prepared in advance based on color light information obtained by measuring a projection image serving as a reference using a color light sensor. It is possible to select a table and correct input image information based on this color conversion table. For this reason, a procedure for creating an RGB input / output characteristic profile from a large amount of color light information is not required, so that the adjustment time until use can be shortened and the manufacturing cost can be reduced.

  In the present invention, the “wall color” means that the projection image is colored by ambient light in addition to the color of the projection surface itself when the projection image appears colored because the projection surface itself has color. This also means the color of the projection surface including the ambient light when it is visible, and is used in a broader sense than the original wall color.

(2) In the projector according to the aspect of the invention, it is preferable that the level of each color is divided into two to three stages.

  By the way, in the projector described in Patent Document 1, since it is necessary to measure the hue of a projected image serving as a reference for each predetermined gradation unit (for example, 256 gradations), it takes time to obtain colored light information. There is also a problem that it takes. On the other hand, by configuring as in the present invention, the wall color of the projection plane is determined and optimized by only measuring the level of each color on the projection plane on which the projection image serving as a reference is projected, for example, once. Since the color conversion table can be selected, the work for obtaining the color light information can be made extremely short.

  Further, by configuring as in the present invention, it is possible to use an inexpensive color light sensor with relatively large noise as the color light sensor, and to reduce the manufacturing cost.

  In this case, when the level of each color is set to three levels for each color, 27 color conversion tables are required. However, as will be described later, only 24 or 18 color conversion tables may be required. it can. On the other hand, when the level of each color is set to two stages for each color, eight color conversion tables are required. However, as will be described later, only six color conversion tables can be required.

(3) In the projector according to the aspect of the invention, it is preferable that the color light sensor is a color image sensor.

In recent years, color imaging devices are generally available at a low cost, and thus, the manufacturing cost can be reduced by configuring as in the present invention.
As the color image sensor, a CCD or a CMOS can be preferably used. In this case, it is not always necessary to use a high-resolution, high-gradation, low-noise device such as a CCD or CMOS for shooting video images as content.

(4) In the projector according to the aspect of the invention, the color light sensor has a function of measuring a level of each color for each region on the projection plane, and the color conversion table selection device performs the projection for each region. Preferably, the color conversion device has a function of determining the wall color of the surface, and the color conversion device has a function of correcting the input image information for each region.

  With this configuration, optimal color correction can be performed for each region. Therefore, when projecting a projected image on a projection surface where the wall color is changing in the projection surface, Even in this case, it is possible to perform good color reproduction by performing optimum color correction for each region accordingly.

(5) The projector of the present invention preferably has a function of correcting trapezoidal distortion based on a result of photographing by the color image sensor.

  Many projectors in recent years include an image sensor for taking a projected image projected on a projection surface in order to correct trapezoidal distortion. For this reason, by configuring as in the present invention, it becomes possible to combine an image sensor for correcting trapezoidal distortion and a color image sensor for performing good color reproduction with one color image sensor, Manufacturing costs can be reduced.

(6) In the projector according to the aspect of the invention, it is preferable that the color light sensor includes a photo sensor and a color filter.

  As described above, a color image sensor can be used as the color light sensor, but a color light sensor including a photo sensor and a color filter can also be used as in the present invention.

(7) The image processing method in the projector according to the present invention includes a color conversion table preparation step of preparing a plurality of color conversion tables corresponding to each predetermined wall color, and a color conversion table preparation step for each color on the projection plane on which a reference projection image is projected. A color conversion table selection step of measuring a level, determining a wall color of the projection plane based on the measured level of each color, and selecting any one of the plurality of color conversion tables; And an input image information correction step for correcting the input image information based on the color conversion table determined in the color conversion table selection step.

  Therefore, according to the image processing method in the projector of the present invention, it is possible to perform good color reproduction using the projector of the present invention.

(8) The image processing program in the projector of the present invention measures the level of each color on the projection surface on which the reference projection image is projected on the projector having a plurality of color conversion tables corresponding to each predetermined wall color. A color conversion table selection step of determining a wall color of the projection plane based on the measured level of each color and selecting any one of the plurality of color conversion tables; and the color conversion table selection And an input image information correction step of correcting the input image information based on the color conversion table determined in the step.

  Therefore, according to the image processing projector in the projector of the present invention, it is possible to perform good color reproduction using a projector having a plurality of color conversion tables corresponding to each predetermined wall color.

  Hereinafter, a projector, an image processing method in the projector, and an image processing program in the projector of the present invention will be described based on the embodiments shown in the drawings.

Embodiment 1
FIG. 1 is a functional block diagram of a projector 10 according to the first embodiment.
As shown in FIG. 1, the projector 10 according to the first embodiment includes a projection optical unit 100 that projects a projection image on a projection surface according to input image information, and a plurality of projectors that are prepared for each predetermined wall color. Based on the color conversion table storage unit 20 for storing the color conversion table, the color light sensor 30 for measuring the level of each color on the projection surface on which the reference projection image is projected, and the level of each color measured by the color light sensor 30. The color conversion table selection device 40 that determines the wall color of the projection surface and selects one of the plurality of color conversion tables based on the wall color, and the color conversion table selection device 40 selects the color conversion table. And a color conversion device 50 that corrects input image information based on the color conversion table.

  The projection optical unit 100 includes an illumination device 110 including a light source lamp, a color separation light guide optical system 120 that color-separates an illumination light beam emitted from the illumination device 110 and guides it to an illuminated area, and color separation light guide optics. Three liquid crystal light modulation devices 130R, 130G, 130B as electro-optic modulation devices that modulate each of the three color lights separated by the system 120 according to image information, and modulation by each of the liquid crystal light modulation devices 130R, 130G, 130B A cross dichroic prism 140 that synthesizes the colored light, and a projection lens 150 that projects the light synthesized by the cross dichroic prism 140 onto a projection surface such as a screen SCR.

  The projector 10 according to the first embodiment includes an A / D conversion device 60 that converts input analog image information into digital image information and the color conversion device 50 described above, and includes digital image information (from the A / D conversion device 60). Image processing apparatus 70 that performs various image processing (resolution conversion, trapezoidal distortion correction, γ correction, color conversion, etc.) on digital image information or digital image information originally input as digital information), and output from image processing apparatus 70 D / A converter 80 that converts the digital image information into analog image information, a liquid crystal drive device 90 that receives the analog image information and drives each of the liquid crystal light modulators 130R, 130G, and 130B, and a control that controls these Part (not shown).

  As the color light sensor 30, a color image sensor composed of a CCD is used. In the projector 10 according to the first embodiment, the color correction is performed and the trapezoidal distortion is corrected based on the photographing result (color light information or trapezoidal distortion information such as the projected image shape and the screen shape). .

  To perform image processing using the projector 10 according to the first embodiment, first, in the projector 10, a plurality of color conversion tables corresponding to each predetermined wall color are prepared and stored in the color conversion table storage unit 20. (Color conversion table preparation step).

  Then, as a pre-process when actually starting to use the projector 10, one of the prepared color conversion tables is selected according to the wall color (color conversion table selection step). When the projector 10 is actually used, the input image information is corrected based on the color conversion table determined in the color conversion table selection step (input image information correction step), and projection relating to the corrected image information is performed. Project an image.

  FIG. 2 is a flowchart for explaining the color conversion table selection step. FIG. 3 is a diagram illustrating a state in which the color conversion table selection step is executed using the projector 10 according to the first embodiment.

  As shown in FIG. 2, the color conversion selection step projects a reference projection image by the projector 10 (reference projection image projection step S2), and sets the level of each color on the projection surface on which the reference projection image is projected. Measurement is performed by the color light sensor 30 (measurement step S4 for each color level), the wall color of the projection surface is determined based on the level of each color measured by the color light sensor 30, and a plurality of color conversions are performed based on the determined wall color. One of the color conversion tables is selected from the tables (wall color determination and color conversion table selection step S6).

  In each color level measurement step S4, as shown in FIG. 3, the color light sensor 30 measures the level of each color in the substantially central portion of the projection surface S.

  FIG. 4 is a diagram for explaining the level of each color in the projector 10 according to the first embodiment. 4A is a diagram for explaining the red level, FIG. 4B is a diagram for explaining the green level, and FIG. 4C is a diagram explaining the blue level. FIG. FIG. 5 is a diagram illustrating a wall color / color conversion table correspondence table in the projector 10 according to the first embodiment. FIG. 6 is a diagram illustrating an example of a color conversion table in the projector 10 according to the first embodiment.

In the projector 10 according to the first embodiment, as shown in FIG. 4, the level of each color is divided into three stages for each color. That is, as shown in FIG. 4A, when the measured intensity of red light is less than the threshold value _TR1 , the red level is set to 1, and the measured intensity of red light is the threshold value. If it is less than the threshold value T _R2 is a T _R1 above, the red level and 2, if the intensity of the red light to be measured is the threshold T _R2 above, and 3 the red level To do. Similarly, as shown in FIG. 4B, when the measured green light intensity is less than the threshold _TG1 , the green level is set to 1, and the measured green light intensity is the threshold. If the value is greater than or equal to the value T _G1 and less than the threshold value T _G2 , the green level is set to 2, and if the measured green light intensity is greater than or equal to the threshold value T _G2 , the green level is set to 3. And Similarly, as shown in FIG. 4C, when the measured blue light intensity is less than the threshold value _TB1 , the blue level is set to 1, and the measured blue light intensity is the threshold. If it is less than the value T _B1 or in and threshold _TB2 is blue levels and 2, when the intensity of the blue light to be measured is the threshold T _B2 above, and 3 blue levels To do.

  In the projector 10 according to the first embodiment, the color conversion table selection device 40 refers to the wall color / color conversion table correspondence table as shown in FIG. 5 to determine the wall color from the level of each color measured by the color light sensor 30. And a corresponding color conversion table is selected from the wall color. For example, when the screen SCR is reddish white and the level of each color is [red, green, blue] = [3, 2, 2], the color conversion table selection device 40 is shown in FIG. As shown, the wall color number is determined to be No. 23, and the color conversion table number is determined to be No. 21.

  The color conversion device 50 corrects the input image information based on the 21st color conversion table (see FIG. 6) selected by the color conversion table selection device 40, and the projector 10 performs the correction. Project a projected image related to the image information. In this case, as shown in FIG. 6, the color conversion device 50 converts the gradation value related to the input image information so as to be small for red, and outputs it, while regarding green and blue, the input image information is converted. The gradation value is converted as it is and output. For this reason, even if the screen SCR is reddish white, the projected image projected from the projector 10 is projected in a form in which the red component is weakened, and therefore, good color reproduction can be performed. .

  For this reason, according to the projector 10 according to the first embodiment, the input image information is automatically corrected based on the color light information obtained by measuring the reference projection image using the color light sensor 30, and the user's arbitrary Therefore, it is easy to perform good color reproduction even in various viewing environments.

  Further, according to the projector 10 according to the first embodiment, a color conversion table prepared in advance is selected from color light information obtained by measuring a projection image serving as a reference using the color light sensor 30, and this color conversion table is selected. The input image information can be corrected based on the above. For this reason, a procedure for creating an RGB input / output characteristic profile from a vast amount of color light information is not required, so that the adjustment time until use can be shortened and the manufacturing cost can be reduced.

  Further, in the projector 10 according to the first embodiment, the level of each color is divided into very few stages, ie, three stages for each color. Therefore, the level of each color on the projection surface on which the reference projection image is projected is measured once, for example. Thus, it becomes possible to determine the wall color of the projection surface and select the optimum color conversion table, and the work of obtaining the color light information can be made extremely short. In addition, an inexpensive color light sensor with relatively large noise can be used as the color light sensor 30, and the manufacturing cost can be reduced.

  In the projector 10 according to the first embodiment, a color image sensor that is generally distributed is used as a color light sensor. In this case, however, high resolution, high gradation, and low noise, such as a CCD or CMOS for photographing, are used. Since it is not always necessary, the manufacturing cost can be reduced.

  Further, the projector 10 according to the first embodiment has a function of correcting trapezoidal distortion based on the result of photographing with the color image sensor described above. For this reason, an image pickup device for correcting trapezoidal distortion and a color image pickup device for performing good color reproduction can be shared by one color image pickup device, and the manufacturing cost can be reduced. it can.

  In the projector 10 according to the first embodiment, as shown in FIG. 5, the levels of the colors are [red, green, blue] = [3, 3, 3], [red, green, blue] = [2 , 2, 2] or [red, green, blue] = [1, 1, 1], the screen SCR is regarded as having no color and color conversion is not performed. That is, the color conversion table is not used.

[Modification 1]
In the projector 10 according to the first embodiment, 24 color conversion tables are prepared as shown in FIG. 5, but the number can be further reduced. FIG. 7 is a diagram illustrating a wall color / color conversion table correspondence table in the projector 10A according to the first modification of the first embodiment.

  In the projector 10A (not shown) according to Modification 1 of Embodiment 1, for example, the color conversion table used for wall color number 15 is the color conversion table number 1 used for wall color number 2. By using the table with assistance, the number of color conversion tables stored in the color conversion table storage unit 20 is further reduced (specifically, 18). This is because wall color number 15 [red, green, blue] = [2, 2, 3] and wall color number 2 [red, green, blue] = [1, 1, 2] Although the brightness is different, the color of the screen SCR is considered to be the same.

  For this reason, according to the projector 10A according to the first modification of the first embodiment, it is possible to obtain an effect that less memory resources are required as compared with the projector 10 according to the first embodiment.

  In addition, the projector 10A according to the first modification of the first embodiment has the same effect as the projector 10 according to the first embodiment.

[Modification 2]
In the projector 10A according to the first modification of the first embodiment, 18 color conversion tables are prepared as shown in FIG. 7, but the number can be further reduced.
FIG. 8 is a diagram illustrating a wall color / color conversion table correspondence table in the projector 10B according to the second modification of the first embodiment.

  In the projector 10B (not shown) according to the second modification of the first embodiment, the level of each color is set to two levels for each color. For this reason, the color conversion table stored in the color conversion table storage unit 20 can be reduced to six. As a result, the projector 10B according to the second modification of the first embodiment requires less memory resources than the projector 10 according to the first embodiment and the projector 10A according to the first modification of the first embodiment. An effect is obtained.

  In addition, the projector 10B according to the second modification of the first embodiment has the same effect as the projector 10A according to the first modification of the first embodiment.

[Modification 3]
FIG. 9 is a diagram illustrating an example of a color conversion table in the projector 10C according to the third modification of the first embodiment.
A projector 10C (not shown) according to the third modification of the first embodiment basically has the same configuration as the projector 10 according to the first embodiment, but the function of the color conversion table is the same as that of the first embodiment. This is different from the case of the projector 10. That is, in the projector 10C according to the third modification of the first embodiment, as shown in FIG. 9, the color conversion table has a function of converting 256-gradation input image information into 1024-gradation image information and outputting it. is doing.

  As described above, the projector 10C according to the third modification of the first embodiment is different from the projector 10 according to the first embodiment in the function of the color conversion table. The projector 10 has the effect as it is.

[Embodiment 2]
FIG. 10 is a diagram illustrating an example of a usage state of the projector 10D according to the second embodiment.
The projector 10D according to the second embodiment basically has the same configuration as the projector 10 according to the first embodiment, but the function of the color light sensor, the function of the color conversion table selection device, and the function of the color conversion table are implemented. This is different from the projector 10 according to the first embodiment. That is, the projector 10D according to the second embodiment, as shown in FIG. 10, the color light sensor 30D measures the level of each color for each _(a total of 64 regions. Of S 11 _{to S 88)} each region of the projection surface features The color conversion table selection device has a function of determining the wall color of the projection plane for each region, and the color conversion device has a function of correcting input image information for each region.

  For this reason, according to the projector 10D according to the second embodiment, optimal color correction can be performed for each region, and thus a projection image can be displayed on a projection surface in which the wall color changes in the projection surface. Even in the case of projection, it is possible to perform good color reproduction by performing appropriate color correction for each region accordingly. In this case, the number of each region is not limited to 64, but can be increased to a number corresponding to the number of pixels of the color imaging device, and in that case, further appropriate color correction can be performed. Become.

  In addition, the projector 10D according to the second embodiment has the same effect as the projector 10 according to the first embodiment.

[Embodiment 3]
The projector 10E (not shown) according to the third embodiment basically has the same configuration as the projector 10 according to the first embodiment, but the configuration of the color conversion table and the function of the color conversion device are the embodiments. 1 is different from the projector 10 according to the first embodiment. That is, in the projector 10E according to the third embodiment, the color conversion table storage unit stores a color conversion table in a form that considers gamma correction. The color conversion device corrects the input image information according to the wall color based on a color conversion table in a form that takes gamma correction into consideration.

  For this reason, according to the projector 10E according to the third embodiment, when the input image information is corrected according to the wall color, the correction is performed based on the color conversion table in the form of taking the gamma correction into consideration. The correction according to the wall color and the gamma correction can be performed simultaneously, and the configuration of the image processing apparatus can be simplified.

  In addition, the projector 10E according to the third embodiment has the same effect as the projector 10 according to the first embodiment. .

  As described above, the projector, the image processing method in the projector, and the image processing program in the projector according to the present invention have been described based on each of the above embodiments, but the present invention is not limited to each of the above embodiments, and the gist thereof is The present invention can be implemented in various modes without departing from the scope, and for example, the following modifications are possible.

(1) In each of the above embodiments, 24 color conversion tables are prepared as shown in FIG. 5, or 18 color conversion tables are prepared as shown in FIG. This can be made even smaller. For example, for wall color number 20 ([red, green, blue] = [3, 1, 2]), wall color number 19 ([red, green, blue] = [3, 1, 1]) By performing color conversion by interpolation using the color conversion table and the color conversion table of wall color number 21 ([red, green, blue] = [3, 1, 3]), wall color number 20 ([red , Green, blue] = [3, 1, 2]).

(2) In the above embodiments, the input image information is corrected according to the color conversion table prepared for each predetermined wall color. However, the present invention is not limited to this. A plurality of color conversion relational expressions can be prepared for each predetermined wall color, and the input image information can be corrected according to these color conversion relational expressions.

(3) In each of the above embodiments, the present invention has been described by taking a front type projector as an example. However, the present invention is not limited to this, and the present invention can also be applied to a rear type projector.

(4) In each of the above embodiments, a liquid crystal light modulation device is used as the electro-optic modulation device, but the present invention is not limited to this. In general, the electro-optical modulation device may be any device that modulates incident light in accordance with image information, and a micromirror light modulation device can also be used.

(5) In each of the above embodiments, a color image sensor is used as the color light sensor, but the present invention is not limited to this. As the color light sensor, a color light sensor including a photo sensor and a color filter may be used.

(6) In each of the above embodiments, the image processing method in the projector has been described. However, on the projection surface on which a reference projection image is projected on a projector having a plurality of color conversion tables corresponding to each predetermined wall color. A color conversion table selection step of measuring a level of each color, determining a wall color of the projection plane based on the measured level of each color, and selecting any one of the plurality of color conversion tables; An image processing program in a projector having a procedure for executing an input image information correction step for correcting the input image information based on the color conversion table determined in the color conversion table selection step is also included in the present invention.

1 is a functional block diagram of a projector 10 according to a first embodiment. The flowchart shown in order to demonstrate a color conversion table selection step. FIG. 3 is a diagram illustrating a state in which a color conversion table selection step is performed using the projector according to the first embodiment. FIG. 4 is a diagram for explaining the level of each color in the projector 10A according to the first embodiment. FIG. 4 is a diagram illustrating a wall color / color conversion table correspondence table in the projector according to the first embodiment. FIG. 3 is a diagram illustrating an example of a color conversion table in the projector according to the first embodiment. FIG. 10 is a diagram showing a wall color / color conversion table correspondence table in the projector 10A according to the first modification of the first embodiment. FIG. 10 is a diagram showing a wall color / color conversion table correspondence table in a projector 10B according to a second modification of the first embodiment. FIG. 10 is a diagram illustrating an example of a color conversion table in a projector 10C according to a third modification of the first embodiment. FIG. 10 is a diagram illustrating a state in which a color conversion table selection step is executed using a projector 10D according to the second embodiment.

Explanation of symbols

10, 10A, 10B, 10C, 10D, 10E ... projector, 20 ... color conversion table storage unit, 30 ... color light sensor, 40 ... color conversion table selection device, 50 ... color conversion device, 60 ... A / D conversion device, 70 DESCRIPTION OF SYMBOLS ... Image processing apparatus, 80 ... D / A converter, 100 ... Projection optical unit, 110 ... Illumination device, 120 ... Color separation light guide optical system, 130R, 130G, 130B ... Liquid crystal light modulation device, 140 ... Cross dichroic prism, 150 ... projection lens, L ... ambient light, S ... projection area, S _{11 to} S ₈₈ ... each area, SCR ... screen

Claims (8)

A projection optical unit that projects a projected image on a projection surface in accordance with input image information;
A plurality of color conversion tables prepared for each predetermined wall color;
A color light sensor for measuring the level of each color on the projection surface on which a projection image serving as a reference is projected;
Color conversion that determines a wall color of the projection plane based on the level of each color measured by the color light sensor and selects any one of the plurality of color conversion tables based on the wall color A table selection device;
A projector comprising: a color conversion device that corrects the input image information based on a color conversion table selected by the color conversion table selection device. The projector according to claim 1, wherein
The projector is characterized in that the level of each color is divided into two to three stages for each color. The projector according to claim 1 or 2,
The projector according to claim 1, wherein the color light sensor is a color image sensor. The projector according to claim 3, wherein
The color light sensor has a function of measuring the level of each color for each region of the projection plane,
The color conversion table selection device has a function of determining a wall color of the projection plane for each region,
The color conversion device has a function of correcting the input image information for each area. The projector according to claim 3 or 4,
A projector having a function of correcting trapezoidal distortion based on a result of photographing by the color image sensor. The projector according to claim 1 or 2,
The projector according to claim 1, wherein the color light sensor includes a photo sensor and a color filter. A color conversion table preparation step of preparing a plurality of color conversion tables corresponding to each predetermined wall color;
One of the plurality of color conversion tables is obtained by measuring the level of each color on the projection plane on which the projection image serving as a reference is projected, determining the wall color of the projection plane based on the measured level of each color. A color conversion table selection step for selecting a color conversion table of
An image processing method in a projector, comprising: an input image information correction step for correcting the input image information based on the color conversion table determined in the color conversion table selection step. To a projector having a plurality of color conversion tables corresponding to each predetermined wall color,
One of the plurality of color conversion tables is obtained by measuring the level of each color on the projection plane on which the projection image serving as a reference is projected, determining the wall color of the projection plane based on the measured level of each color. A color conversion table selection step for selecting a color conversion table of
An image processing program in a projector, comprising: a step of executing an input image information correction step of correcting the input image information based on the color conversion table determined in the color conversion table selection step.

Images