JP2019168545A - Projection controller, projector, projection control method, and program - Google Patents

Abstract

To maintain projection operation with high picture quality while adapting to a change of environment light.SOLUTION: The present invention comprises: an input processing unit 21 for inputting an image signal; a projection unit PJ for projecting an image that corresponds to the inputted image signal; an imaging unit IM for acquiring average illuminance on a surface to be projected by the projection unit PJ; and a CPU 33 for causing the average luminance of an inputted image signal to be acquired by a projection image drive unit 22, and changing/setting a projection condition for projection by the projection unit PJ on the basis of the acquired average luminance and average illuminance.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a projection control apparatus, a projection apparatus, a projection control method, and a program.

  In order to provide an environment-adaptive image display system, etc., a technology that corrects the color to increase the output of at least the low gradation range and increases the brightness when there is an influence of ambient light. Has been proposed. (For example, Patent Document 1)

JP 2002-125125 A

  In the technique described in the above-mentioned patent document, a period for projecting primary color light such as white is provided, and reflected light when the primary color light is projected on a screen is measured by a color light sensor, so that the influence of environmental light on the projected image Is calculated. However, it is unlikely that the primary color light projecting operation will be interrupted and executed in the middle of actually selecting and projecting a video signal such as a presentation video. This is considered to be an operation to be executed as an initial setting at the time of installation of the apparatus. For this reason, it is difficult to respond immediately in a situation where the influence of environmental light changes, such as an installation location that is affected by external light.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a projection control apparatus and a projection apparatus capable of maintaining a projection operation with high image quality adapted to changes in ambient light. Another object is to provide a projection control method and program.

  A projection control device according to an aspect of the present invention projects an image according to an image signal acquired by the image signal acquisition unit, with an image signal acquisition unit that acquires an image signal and a projection unit that projects the image. Projection control means for controlling, first brightness acquisition means for acquiring first brightness information including average brightness information in the image plane according to the image signal acquired by the image signal acquisition means, Second brightness acquisition means for acquiring second brightness information including average brightness information on the projection surface projected by the projection unit, the first brightness information, and the second brightness Projection condition setting means for changing and setting the projection condition in the projection unit based on the information.

  According to the present invention, it is possible to maintain a projection operation with high image quality adapted to changes in ambient light.

The block diagram which shows the function structure of the electronic circuit of the projector apparatus which concerns on one Embodiment of this invention. 6 is a flowchart showing processing contents executed in parallel during the projection operation according to the embodiment. The figure which shows the relationship between each acquisition result of the average brightness | luminance of the input image signal which concerns on the same embodiment, and the average illumination intensity on a projection surface, and estimated contrast.

Hereinafter, an embodiment when the present invention is applied to a projector apparatus will be described in detail with reference to the drawings.
FIG. 1 is a block diagram mainly showing a functional configuration of an electronic circuit of a projector apparatus 10 of a DLP (Digital Light Processing) system according to the present embodiment. In the figure, an input processing unit 21 includes, for example, a pin jack (RCA) type video input terminal, a D-sub15 type RGB input terminal, an HDMI (registered trademark) (High-Definition Multimedia Interface) terminal, and a USB (Universal Serial Bus). ) Terminal.

  An analog or digital image signal of various standards input to the input processing unit 21 or stored in a USB memory and selectively read out is digitized as necessary by the input processing unit 21, and then the system bus. The image is sent to the projection image drive unit 22 via SB. The projection unit PJ includes the projection image drive unit 22, a micromirror element 23, a light source unit 24, a mirror 25, a projection lens unit 26, and a lens motor (M) 27.

  The projection image driving unit 22 determines a frame rate according to a predetermined format according to the sent image data, for example, 120 [frame / second] when the input image data is 60 [Hz], and a color component. The micromirror element 23, which is a display element, is driven to display by faster time-division driving obtained by multiplying the number of divisions and the number of display gradations.

  The micromirror element 23 performs display operation by individually turning on / off each inclination angle of a plurality of micromirrors arranged in an array, for example, horizontal 1280 pixels × vertical 960 pixels (aspect ratio 4: 3) at high speed. Thus, an optical image is formed by the reflected light.

  On the other hand, R, G, B primary color lights are emitted cyclically from the light source unit 24 in a time-sharing manner. The light source unit 24 includes an LED (light emitting diode) that is a semiconductor light emitting element, and repeatedly emits primary color lights of R, G, and B in a time division manner. The LED included in the light source unit 24 may include an LD (semiconductor laser) or an organic EL element as an LED in a broad sense. The primary color light from the light source unit 24 is totally reflected by the mirror 25 and applied to the micromirror element 23.

  Then, an optical image is formed by the reflected light from the micromirror element 23, and the formed optical image is projected to the outside through the projection lens unit 26 and displayed on the projection target surface.

  The projection lens unit 26 includes a focus lens for moving a focus position and a zoom lens for changing a zoom (projection) angle of view in an internal lens optical system, and each of these lenses is a lens motor (M). 27, the position along the optical axis direction is selectively driven via a gear mechanism (not shown).

  On the other hand, the projector device 10 includes an imaging unit IM that captures the projection direction of the projection lens unit 26. The photographing unit IM has a photographing lens unit 28. The photographic lens unit 28 includes a zoom lens for changing the photographic angle of view and a focus lens for moving the focus position, and the photographic lens unit 28 and the projection unit PJ so as to capture an image projected by the projection unit PJ. In view of this parallax, the photographic field angle is slightly larger than the projected field angle emitted when the projection lens unit 26 is at the widest angle. An external optical image that enters the photographing lens unit 28 is formed on a CMOS image sensor 29 that is a solid-state imaging device.

  An image signal obtained by image formation by the CMOS image sensor 29 is digitized by the A / D converter 30 and then sent to the captured image processing unit 31.

  The photographed image processing unit 31 scans and drives the CMOS image sensor 29 to execute a photographing operation, and performs image processing on image data obtained by photographing, thereby extracting and extracting a projection range by the projection unit PJ. Calculation of average illuminance (second brightness information) within the projection range is executed. In addition, the photographic image processing unit 31 drives a lens motor (M) 32 for moving the focus lens position of the photographic lens unit 28.

  The CPU 33 controls all the operations of the above circuits. The CPU 33 is directly connected to the main memory 34 and the program memory 35. The main memory 34 is composed of, for example, an SRAM and functions as a work memory for the CPU 33. The program memory 35 is composed of an electrically rewritable nonvolatile memory, for example, a flash ROM, and various fixed data such as an operation program executed by the CPU 33 and an OSD (On Screen Display) image superimposed on a base image. Remember.

  The CPU 33 controls the projector apparatus 10 by reading out the operation program, fixed data, etc. stored in the program memory 35, developing and holding them in the main memory 34, and executing the program, thereby controlling the projector apparatus 10 in an integrated manner. To do.

  The CPU 33 executes various projection operations in accordance with operation signals from the operation unit 36. The operation unit 36 includes an operation key provided in a main body housing of the projector device 10 or a light receiving unit that receives an infrared modulation signal from a remote controller dedicated to the projector device 10 (not shown), and receives and accepts a key operation signal. A signal corresponding to the key operation signal is sent to the CPU 33.

The CPU 33 is further connected to the audio processing unit 37 via the system bus SB.
The sound processing unit 37 includes a sound source circuit such as a PCM sound source, converts the sound signal given during the projection operation into an analog signal, drives the speaker unit 38 to emit sound, or generates a beep sound or the like as necessary.

[Operation]
Next, the operation of the above embodiment will be described.
In the initial setting of the projection operation, the user of the projector device 10 operates the zoom lens in the projection lens unit 26 of the projection unit PJ to set a desired projection angle of view, and the screen (not shown) that is a projection target. Alternatively, an autofocus instruction on the curtain is operated in advance.

  As the zoom lens of the projection lens unit 26 of the projection unit PJ is operated, the zoom lens of the photographing lens unit 28 of the photographing unit IM is moved in conjunction with each other, so that the range of the image projected by the projection unit PJ is ensured. The shooting angle of view of the photographic lens unit 28 is set so as to cover the distance from the focus lens position to the projection target by the autofocus operation of the photographic image by driving the focus lens of the photographic lens unit 28. Can be acquired.

  Therefore, the position of the focus lens on the projection lens unit 26 side of the projection unit PJ is set to the same distance, and the position of the focus lens of the projection lens unit 26 is finely adjusted while monitoring the captured image by the imaging unit IM. Thus, accurate autofocus adjustment of the projected image can be realized.

  FIG. 2 shows the light emission luminance and micromirror element of each primary color light LED of the light source unit 24 executed in parallel with the projection operation according to the image signal input to the input processing unit 21 in the projector device 10. 23 is a flowchart showing the content of the emission luminance setting process in the projection unit PJ by the gradation adjustment of the image displayed in 23.

  The emission luminance setting process in the projection unit PJ is executed by the CPU 33, the captured image processing unit 31 of the imaging unit IM operating under the control of the CPU 33, and the projection image driving unit 22 of the projection unit PJ.

  At the beginning of processing, the CPU 33 sets the image frame count to a multiple of 120 if the acquisition timing set in advance, for example, the frame rate of the image signal input to the input processing unit 21 at that time is 120 [frames / second]. By repeatedly determining whether or not the acquisition timing has been reached once every 1 [second] depending on whether or not the timing is reached, the system waits for the timing (step S101).

  When it is determined that the acquisition timing is reached (Yes in step S101), the CPU 33 causes the captured image processing unit 31 of the imaging unit IM to capture a range including the projection image, and projects it from the captured image by the projection unit PJ. A region of the projection image corresponding to the image pattern is extracted (step S102).

  Next, the CPU 33 determines whether or not the automatic light control function is turned on at that time (step S102). If it is determined that the automatic light control function is not set to ON and is set to OFF (No in step S102), the CPU 33 cancels the subsequent processing and starts the processing from step S101 again. Return.

  If it is determined in step S102 that the automatic light control function is turned on (Yes in step S102), the CPU 33 causes the captured image processing unit 31 to capture the projection plane and obtains the obtained image data. The image data of the projection area is extracted and acquired by extracting a pattern distribution process with the image data projected by the projection unit PJ at that time and a substantially rectangular distribution area having higher illuminance than the surroundings. (Step S104).

  The CPU 33 calculates the illuminance gradation value (second brightness information) of all the pixels constituting the extracted projection area image data from the photographed image 31, and then calculates the illuminance gradation value of all the pixels. The average gradation value of illuminance is calculated by integrating and dividing by the number of pixels.

  In addition, the CPU 33 causes the projection image drive unit 22 to calculate the average gradation value (first brightness information) of the luminance of all pixels of the image data projected at that time, and the average gradation value is Whether or not the calculated average gradation value of the illuminance of the projection area is valid as a sample is determined based on whether or not the average gradation value of the other brightness calculated so far is dispersed by a certain value or more (step S105). .

The point of obtaining the average gradation value of the brightness of the projected image will be described. When the image data to be projected is composed of all n pixels, the CPU 33 uses the projection image driving unit 22 to calculate the luminance gradation value Yi at the i (i = 1 to n) -th pixel by a general luminance matrix calculation.
Yi = 0.29888Ri + 0.5868Gi + 0.1144Bi
(Where Y i is the luminance value of the i-th pixel,
Ri, Gi, Bi: R, G, B values of the i-th pixel. )
Calculate as Under the control of the CPU 33, the projection image driving unit 22 divides the total luminance of all n pixels by the number of pixels n, and calculates the average gradation value of the luminance of the projected image.

  The average gradation value of the illuminance of the projection area calculated by the photographic image processing unit 31 is also calculated by calculating the illuminance gradation value Ii of each photographic pixel by the same formula as the luminance matrix calculation. Is divided by the number of pixels to calculate an average gradation value of illuminance in the projection area.

  FIG. 3 is a diagram illustrating the relationship between the average gradation value of the luminance of all the pixels of the image input to the projection unit PJ and the average gradation value of the illuminance of the projection area calculated from the projection result.

  In the figure, the average gradation value of the luminance of all pixels of the input image is shown in the range of “0” to “255” corresponding to 8 bits, and the average gradation value of the luminance is “ When an image that is black on the entire screen is projected as “0”, the average gradation value of illuminance on the projection surface is I 0, and the average gradation value of luminance is “255”. The average gradation value of the illuminance on the projection surface when projected is denoted by If. To obtain as wide and dispersed samples as possible within the range of the minimum value I0 and the maximum value If of the average gradation value of the illuminance as indicated by the black dot plot position where the actual average gradation value of the illuminance is indicated. Thus, as shown by the linear expression “y = f (x)”, the relationship between the luminance of the input image and the illuminance on the projection surface corresponding to the projection environment can be estimated with higher accuracy.

  The CPU 33 causes the projection image driving unit 22 to calculate the average gradation value of the luminance of all the pixels of the image currently projected, while the average gradation of the illuminance of the projection area from the captured image processing unit 31 as described above. Let the value be calculated. The CPU 33 determines that the set of the average gradation value of the luminance of the input image and the average gradation value of the illuminance of the projection area in the photographed image is appropriately separated from the other set of the same average gradation value already calculated. For example, depending on whether one calculated value is obtained for each “30” gradation within the range of the average gradation value “0” to “255” of the luminance of the input image. It is determined whether the set of average gradation values is valid as a sample.

  When it is determined that the set of calculated average gradation values is not valid as a sample (No in step S105), the very vicinity of the black spot position already plotted in FIG. 3 is the calculated average gradation value set. Therefore, the CPU 33 invalidates the set of the average gradation values and returns to the processing from step S104 to obtain the next sample.

  If it is determined in step S105 that the set of calculated average gradation values is valid as a sample (Yes in step S105), the CPU 33 determines the average gradation value of the luminance of the input image and the projection area in the captured image. A set of average gradation values of illuminance is held and set as valid plot data in FIG. 3 (step S106).

  Thereafter, the CPU 33 determines whether or not the number of samples has reached a preset specified number, for example, “10” (step S107). If it is determined that the number of samples has not reached the specified number (No in step S107), the CPU 33 returns to the process from step S104 to obtain more samples.

  If it is determined in step S107 that the number of samples has reached the specified number (Yes in step S107), the CPU 33 determines the average gradation value of the luminance of the input image and the illuminance of the projection area in the captured image based on the sample result. The approximate expression is calculated by approximating the correlation of the average gradation values by linear approximation or other functions (step S108).

  When the correlation between the average gradation value of the luminance of the input image and the average gradation value of the illuminance of the projection area in the captured image is not linear due to the influence of gamma correction or the like, the CPU 33 obtains the prior correction information. By obtaining the average gradation value of the luminance of the input image by using the correction information, it is possible to cope with an approximation expression by linear approximation.

  The CPU 33 estimates the average gradation value I0 of the illuminance at the luminance gradation “0” in FIG. 3 and the average gradation value If of the illuminance at the luminance gradation “255” using the calculated approximate expression. Thus, the current contrast value is estimated (step S109).

  Then, it is determined whether or not the contrast value as the estimation result is out of an allowable range of the contrast value set in advance (step S110).

  Specifically, the contrast value as the estimation result is set in advance by comparing the contrast value of the allowable range of the contrast value stored in advance in the program memory 35 with the contrast value of the estimation result. It is determined whether the contrast value is out of the allowable range.

  When it is determined that the contrast value as the estimation result is not out of the allowable range of the contrast value set in advance and is within the allowable range (No in step S110), the CPU 33 does not need to adjust the contrast. The process returns to the process from step S101 and waits for the next acquisition timing.

  If it is determined in step S110 that the contrast value as the estimation result is outside the allowable range of the contrast value set in advance (No in step S110), the CPU 33 then projects the projection unit PJ at that time. Since the light emission luminance due to is low, it is determined whether or not the contrast value is below the allowable range (step S111).

  When it is determined that the light emission luminance of the projection unit PJ at that time is low and the contrast value is below the allowable range (Yes in step S111), the CPU 33 drives the driving current value of each LED in the light source unit 24 of the projection unit PJ. Is updated so as to increase the light emission luminance of these LEDs by a certain value (step S112), the process returns to the process from step S101 and waits for the next acquisition timing.

  In Step S111, when it is determined that the light emission luminance by the projection unit PJ at that time is not low and the contrast value is not below the allowable range (No in Step S111), the projection unit PJ at that time Since the light emission luminance is high and the contrast value exceeds the allowable range, the CPU 33 lowers the light emission luminance of the LEDs by a certain value by lowering the drive current value of each LED in the light source unit 24 of the projection unit PJ. After the update setting is made (step S113), the process returns to the process from step S101 and waits for the next acquisition timing.

  In steps S122 and S123 described above, the update setting is performed so that the light emission luminance of each LED in the light source unit 24 is adjusted to be increased or decreased by a certain value. However, the present embodiment is not limited to this, and the estimation result In accordance with the contrast value, the light emission luminance of the light source unit 24 is basically processed by only one adjustment operation so that the necessary contrast corresponding to the projection mode set at that time is obtained. Also good.

  In the above embodiment, after calculating an approximate expression using linear approximation for the correlation between the average gradation value of the luminance of the input image and the average gradation value of the illuminance of the projection area, the luminance gradation is “0”. Is configured to estimate the average gradation value I0 of the illuminance and the average gradation value If of the illuminance when the luminance gradation is "255". However, the present invention is not limited to this, and the value when the luminance gradation is "0" is used. It is also possible to configure such that only the estimation is performed and the influence of ambient light is estimated from the estimated average gradation value I0.

  With this configuration, when the average gradation value I0 is lower than the reference value, it is determined that the projection target is not affected by the ambient light and has a sufficiently high contrast ratio, and the emission luminance of the light source unit 24 is lowered. The amount of electric power consumed in the light source unit 24 can be suppressed while performing a process to ensure a sufficient contrast ratio. In addition, when the average gradation value I0 is higher than the reference value, a process of increasing the light emission luminance of the light source unit 24 may be performed to control the contrast ratio to be close to an ideal value.

  With the above configuration, without performing the process of estimating the average gradation value If when the luminance gradation is “255” and the process of calculating the estimated contrast ratio using the average gradation value I0 and the average gradation value If, The contrast ratio can be simply optimized and the amount of power consumed by the light source unit 24 can be reduced.

  In the above-described embodiment, the configuration is such that a plurality of sample points are acquired in order to estimate the correlation between the average gradation value of the luminance of the input image and the average gradation value of the illuminance of the projection area. I can't.

  For example, the average gradation value of the luminance of the input image is calculated in advance, and only the illuminance average value of the projection area when the input image whose average gradation value is the lowest in the entire input image is projected is acquired. You may do it. Based on the acquired relationship between the average illuminance value of the projection area and a predetermined reference value, the processing described in the above-described modification is performed.

  With this configuration, the number of sample acquisitions to be acquired can be reduced, and a simple process can be performed without estimating the correlation between the average gradation value of the luminance of the input image and the average gradation value of the illuminance of the projection area. Ambient light effects can be estimated.

  In addition, in order to detect a change in ambient light, the process of obtaining the average gradation value of the illuminance of the projection area at a timing at which the average gradation value of the luminance of the input image takes a specific value is performed at a predetermined interval. Anyway.

  By acquiring the average gradation value of the illuminance of the projection area at a predetermined interval, a change in ambient light can be detected from the change in the average gradation value of the illuminance. When a change is detected, the light emission luminance of the light source unit 24 may be changed according to the amount of change in the illuminance average gradation value, and control may be performed so that the contrast ratio approaches an ideal value. Moreover, when a change is detected, you may comprise so that the contrast correction process described in a present Example may be performed from the beginning.

  In the above-described embodiment, the contrast ratio is adjusted by adjusting the output of the light source unit 24, but the present invention is not limited to this. For example, the contrast ratio may be adjusted by increasing the average gradation value If by driving a zoom lens provided in the projection device to narrow the projection angle of view. Further, when the contrast ratio is lower than the reference value and the projection apparatus is in a power saving projection mode such as an eco mode at that time, the average gradation value If is changed to the normal projection mode. The contrast ratio may be adjusted by increasing the contrast ratio.

  Further, in the above-described embodiment, the above-described operation has been described as the acquisition timing set in advance for each period conceived for one frame of the projected image. However, the period can be arbitrarily set by the user of the projector device 10. good.

  Moreover, in the said embodiment, although comprised so that average brightness | luminance might be acquired from a picked-up image, you may comprise so that the brightness information of a projection surface may be acquired using the illuminance meter installed in the projection surface.

[effect]
As described above in detail, according to the present embodiment, it is possible to maintain a projection operation with high image quality adapted to changes in ambient light.

  In the above embodiment, the projector apparatus 10 includes the imaging unit IM together with the projection unit PJ, and the projection area including the projection image is acquired by the imaging unit IM in the apparatus. Projection operation with higher image quality can be maintained more accurately without the need to connect an external imaging device such as a digital camera.

  Furthermore, in the above embodiment, since the area of the projection surface is extracted from the captured image and the average illuminance in the area is acquired, the average illuminance in the projection area can be acquired with higher accuracy.

  In addition, in the above embodiment, since the average luminance of all the pixels constituting one frame of the image to be projected is calculated and acquired, the average luminance in the projection area can be acquired with higher accuracy.

  Although not described in the above embodiment, depending on the type of image signal to be input, information on average luminance in units of frames of the image may be added in advance as supplementary information. In the case of inputting an image signal, it is possible to further reduce the burden required for the arithmetic processing by effectively utilizing the added average luminance information.

  In the above embodiment, the projection condition can be changed and set after estimating the contrast of the image projected with higher accuracy based on the contents of the plurality of sets of the acquired average luminance and average illuminance.

  In addition, regarding the contents of multiple sets of average brightness and average illuminance acquired above, the validity of the information is judged and necessary multiple sets of information are secured, so the contrast of the projected image is estimated. Can maintain a high level of accuracy.

  Although the above embodiment has been described with respect to a case where the present invention is applied to a DLP (registered trademark) type projector apparatus using an LED as an element serving as a light source, the present invention does not limit the element of the light source, the projection system, etc. For example, the present invention can be similarly applied to a color liquid crystal type projector using a high-pressure mercury lamp.

  In addition, the present invention can be applied not only to the projection apparatus but also to various display apparatuses having a flat panel display or the control apparatus thereof, for example, in which the image display state changes depending on the surrounding environment. And

  In addition, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention in the implementation stage. In addition, the embodiments may be appropriately combined as much as possible, and in that case, the combined effect can be obtained. Further, the above embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements. For example, even if some constituent requirements are deleted from all the constituent requirements shown in the embodiment, the problem described in the column of the problem to be solved by the invention can be solved, and the effect described in the column of the effect of the invention Can be obtained as an invention.

Hereinafter, the invention described in the scope of claims of the present application will be appended.
[Claim 1]
Image signal acquisition means for acquiring an image signal;
A projection control unit configured to project an image according to the image signal acquired by the image signal acquisition unit in a projection unit that projects an image;
First brightness acquisition means for acquiring first brightness information including average brightness information in the image plane according to the image signal acquired by the image signal acquisition means;
Second brightness acquisition means for acquiring second brightness information including average brightness information on the projection surface projected by the projection unit;
A projection condition setting means for changing and setting a projection condition in the projection unit based on the first brightness information and the second brightness information;
A projection control apparatus comprising:
[Claim 2]
The projection control apparatus according to claim 1, wherein the second brightness information is information acquired from a projection surface on which an image corresponding to the first brightness information is projected.
[Claim 3]
An image pickup means for picking up an image of the projection surface including an image to be projected by the projection unit;
The second brightness acquisition means acquires second brightness information including average brightness information from the image of the projection surface imaged by the imaging means.
The projection control apparatus according to claim 1 or 2.
[Claim 4]
The second brightness acquisition unit acquires the second brightness information including the average brightness information within the corresponding range after extracting the projection range from the image of the projection surface imaged by the imaging unit. The projection control device according to claim 3.
[Claim 5]
The first brightness acquisition unit acquires first brightness information including average brightness information of all pixels constituting one frame of the image signal acquired by the image signal acquisition unit. The projection control apparatus in any one of thru | or 4.
[Claim 6]
The image signal acquisition means acquires an image signal including average brightness information,
The first brightness acquisition means acquires first brightness information including average brightness information included in the image signal acquired by the image signal acquisition means.
The projection control apparatus according to claim 1.
[Claim 7]
The projection condition setting means includes first brightness information including average brightness information acquired by the first brightness acquisition means and first brightness information including average brightness information acquired by the second brightness acquisition means. The projection control apparatus according to claim 1, wherein the projection condition in the projection unit is changed and set based on the contents of a plurality of sets of second brightness information.
[Claim 8]
The projection condition setting means includes first brightness information including average brightness information acquired by the first brightness acquisition means and first brightness information including average brightness information acquired by the second brightness acquisition means. The projection control according to claim 7, wherein the projection condition in the projection unit is changed and set based on a plurality of sets of information that are determined to be valid based on the validity of information that is a set of second brightness information. apparatus.
[Claim 9]
A projection apparatus comprising: the projection control apparatus according to any one of claims 1 to 8; and the projection unit.
[Claim 10]
An image signal acquisition step of acquiring an image signal;
A projection control step for controlling the projection unit that projects an image to project an image according to the image signal acquired in the image signal acquisition step;
A first brightness acquisition step of acquiring first brightness information including average brightness information in the image plane according to the image signal acquired in the image signal acquisition step;
A second brightness acquisition step of acquiring second brightness information including average brightness information on the projection surface projected by the projection unit;
Based on the first brightness information and the second brightness information, a projection condition setting step for changing and setting the projection condition in the projection unit,
A projection control method.
[Claim 11]
An apparatus including an image signal acquisition unit that acquires an image signal and a projection control unit that controls to project an image according to the image signal acquired by the image signal acquisition unit by a projection unit that projects an image is built in. A program executed by a computer, wherein the computer is
First brightness acquisition means for acquiring first brightness information including average brightness information in the image plane according to the image signal acquired by the image signal acquisition unit;
Second brightness acquisition means for acquiring second brightness information including average brightness information on the projection surface projected by the projection unit;
A projection condition setting means for changing and setting a projection condition in the projection unit based on the first brightness information and the second brightness information;
Program to make it work.

10. Projector device,
21 ... Input processing unit,
22 ... projected image drive unit,
23 ... Micromirror element,
24 ... light source part,
25 ... Mirror,
26 ... projection lens part,
27 ... Lens motor (M),
28 ... Photography lens part,
29 ... CMOS image sensor,
30 ... A / D converter,
31 ... The captured image processing unit,
32 ... Lens motor (M),
33 ... CPU,
34 ... Main memory,
35 ... Program memory,
36 ... operation unit,
37 ... voice processing unit,
38 ... Speaker unit,
IM ... Shooting part,
PJ ... projection part,
SB ... System bus

Claims (11)

Image signal acquisition means for acquiring an image signal;
A projection control unit configured to project an image according to the image signal acquired by the image signal acquisition unit in a projection unit that projects an image;
First brightness acquisition means for acquiring first brightness information including average brightness information in the image plane according to the image signal acquired by the image signal acquisition means;
Second brightness acquisition means for acquiring second brightness information including average brightness information on the projection surface projected by the projection unit;
A projection condition setting means for changing and setting a projection condition in the projection unit based on the first brightness information and the second brightness information;
A projection control apparatus comprising:   The projection control apparatus according to claim 1, wherein the second brightness information is information acquired from a projection surface on which an image corresponding to the first brightness information is projected. An image pickup means for picking up an image of the projection surface including an image to be projected by the projection unit;
The second brightness acquisition means acquires second brightness information including average brightness information from the image of the projection surface imaged by the imaging means.
The projection control apparatus according to claim 1 or 2.   The second brightness acquisition unit acquires the second brightness information including the average brightness information within the corresponding range after extracting the projection range from the image of the projection surface imaged by the imaging unit. The projection control device according to claim 3.   The first brightness acquisition unit acquires first brightness information including average brightness information of all pixels constituting one frame of the image signal acquired by the image signal acquisition unit. The projection control apparatus in any one of thru | or 4. The image signal acquisition means acquires an image signal including average brightness information,
The first brightness acquisition means acquires first brightness information including average brightness information included in the image signal acquired by the image signal acquisition means.
The projection control apparatus according to claim 1.   The projection condition setting means includes first brightness information including average brightness information acquired by the first brightness acquisition means and first brightness information including average brightness information acquired by the second brightness acquisition means. The projection control apparatus according to claim 1, wherein the projection condition in the projection unit is changed and set based on the contents of a plurality of sets of second brightness information.   The projection condition setting means includes first brightness information including average brightness information acquired by the first brightness acquisition means and first brightness information including average brightness information acquired by the second brightness acquisition means. The projection control according to claim 7, wherein the projection condition in the projection unit is changed and set based on a plurality of sets of information that are determined to be valid based on the validity of information that is a set of second brightness information. apparatus.   A projection apparatus comprising: the projection control apparatus according to any one of claims 1 to 8; and the projection unit. An image signal acquisition step of acquiring an image signal;
A projection control step for controlling the projection unit that projects an image to project an image according to the image signal acquired in the image signal acquisition step;
A first brightness acquisition step of acquiring first brightness information including average brightness information in the image plane according to the image signal acquired in the image signal acquisition step;
A second brightness acquisition step of acquiring second brightness information including average brightness information on the projection surface projected by the projection unit;
Based on the first brightness information and the second brightness information, a projection condition setting step for changing and setting the projection condition in the projection unit,
A projection control method. An apparatus including an image signal acquisition unit that acquires an image signal and a projection control unit that controls to project an image according to the image signal acquired by the image signal acquisition unit by a projection unit that projects an image is built in. A program executed by a computer, wherein the computer is
First brightness acquisition means for acquiring first brightness information including average brightness information in the image plane according to the image signal acquired by the image signal acquisition unit;
Second brightness acquisition means for acquiring second brightness information including average brightness information on the projection surface projected by the projection unit;
A projection condition setting means for changing and setting a projection condition in the projection unit based on the first brightness information and the second brightness information;
Program to make it work.