JP5771997B2 - Projection apparatus, projection method, and program - Google Patents

Description

  The present invention relates to a projection apparatus, a projection method, and a program suitable for, for example, a battery-powered projector with a limited power supply capacity.

  Recently, projectors using a semiconductor light emitting element such as a laser diode (hereinafter referred to as “LD”) as a light source have been put into practical use, and have high brightness, high color reproducibility, high pressure discharge lamps, etc. It is advantageous in terms of power consumption and heat countermeasures compared to the discharge tube, and has many excellent points such as easier device miniaturization.

  In this type of projector, various safety measures have been considered in order to prevent projection light from entering the human body, particularly the eyes. (For example, Patent Document 1)

Japanese Patent Application Laid-Open No. 2004-070298

  Various safety measures have been considered, including techniques described in the above-mentioned patent documents, for preventing laser light used for the light source from accidentally damaging the human body before reaching the projection plane.

  On the other hand, with the recent development of semiconductor technology, the semiconductor light-emitting element as a light source has been increased in output, and a brighter image can be projected. However, the amount of heat generated from the semiconductor light emitting element is increased in exchange for an increase in output of the semiconductor light emitting element, and a cooling fan generally used for this type of light source is required to have a larger capacity. There is a tendency.

  Therefore, especially when the projector is used in a narrow projection environment, the projected image becomes uselessly bright due to the short projection distance, and the driving sound of the cooling fan tends to be noisy. There are many points.

  In particular, in a portable projector using a battery as a power source, it is desired that the projection time is further increased by effectively utilizing a battery having a limited capacity while ensuring the projection image quality.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide a projection apparatus and a projection that can be operated while ensuring appropriate image quality and suppressing wasteful power consumption as much as possible. It is to provide a method and a program.

One embodiment of the present invention is a projection apparatus, which includes a light source, a projection unit that forms and projects a light image according to an input image signal using light from the light source, and a projection plane formed by the projection unit. Measurement means for measuring the distance to the projection, projection control means for variably setting the operation mode including brightness adjustment of the light image emitted from the projection means, and driving by the light source according to the measurement result of the measurement means. Detecting means for detecting brightness in the direction of the projection plane before and after the start, focusing means for focusing the optical image on the projection plane, and receiving means for receiving a focusing operation using the focusing means , The projection control means turns off the light source based on the focusing operation by the receiving means, and then detects the brightness in the direction of the projection plane before and after starting the driving by the light source by the detection means, and measures the measurement. Measurement by means And fruit, according to the difference in brightness between before and after the projection plane direction to start driving by the light source, and performing brightness adjustment of the light image emitted from the projection unit.

  According to the present invention, it is possible to ensure proper image quality and to operate while suppressing wasteful power consumption as much as possible.

1 is a diagram for mainly explaining a functional configuration of an electronic circuit of a data projector apparatus according to an embodiment of the present invention. 7 is a flowchart showing the contents of projection processing including initial settings after power-on according to the embodiment. The figure which shows the selection content of the projection mode memorize | stored in the program memory which concerns on the same embodiment, and the content of the lookup table.

  Hereinafter, an embodiment in which the present invention is applied to a DLP (Digital Light Processing) (registered trademark) battery-driven data projector apparatus will be described with reference to the drawings.

  FIG. 1 is a diagram for mainly explaining a functional configuration of an electronic circuit of the data projector device 10 according to the present embodiment. In the figure, reference numeral 11 denotes an input unit. The input unit 11 includes, for example, a pin jack (RCA) type video input terminal, a D-sub 15 type RGB input terminal, an HDMI (High-Definition Multimedia Interface) standard image / audio input terminal, and a USB (Universal Serial Bus). An image signal and an audio signal are input from an external device having a connector and connected by wire through any of these terminals.

  The image signals of various standards input from the input unit 11 are input to the projection image conversion unit 12 that is generally called a scaler via the system bus SB.

  The projection image conversion unit 12 unifies the input image signal into an image signal of a predetermined format suitable for projection, appropriately writes it in a built-in display buffer memory, and then reads and projects the written image signal. The image is sent to the image driver 13.

  At this time, data such as symbols indicating various operation states for OSD (On Screen Display) is also superimposed on the image signal by the buffer memory in the projection image conversion unit 12 as necessary, and the processed image signal is read out. The image is sent to the projection image drive unit 13.

  The projection image drive unit 13 multiplies a frame rate according to a predetermined format, for example, 60 [frames / second], the number of color component divisions, and the number of display gradations, in accordance with the transmitted image signal. The micromirror element 14 is driven to display by high-speed time-division driving.

  The micromirror element 14 performs a display operation by individually turning on / off each inclination angle of a plurality of, for example, WXGA (horizontal 1280 pixels × vertical 768 pixels) micromirrors arranged in an array. Then, an optical image is formed by the reflected light.

  On the other hand, R, G, and B primary color lights are emitted cyclically from the light source unit 15 in a time-sharing manner. The primary color light from the light source unit 15 is totally reflected by the mirror 16 and applied to the micromirror element 14.

  Then, an optical image is formed by the reflected light from the micromirror element 14, and the formed optical image is projected and displayed on a screen (not shown) to be projected via the projection lens unit 17.

  The projection lens unit 17 has a focus lens group for moving a focus position and a zoom lens group for changing a zoom (projection) angle of view in an internal lens optical system. It is driven by the rotation of the lens motor (M) 18. The lens motor 18 is driven based on a drive signal from the projection image drive unit 13.

The light source unit 15 includes an LD (hereinafter referred to as “G-LD”) 19 that emits green (G) light,
It has a light emitting diode (hereinafter referred to as “R-LED”) 20 that emits red (R) light and an LD (hereinafter referred to as “B-LD”) 21 that emits blue (B) light.

  Green light emitted from the G-LD 19 is transmitted to the mirror 16 after passing through the dichroic mirror 22.

  The red light emitted from the R-LED 20 is reflected by the dichroic mirror 23, then reflected by the dichroic mirror 22 and sent to the mirror 16.

The blue light emitted from the B-LD 21 is reflected by the mirror 24, then passes through the dichroic mirror 23, is then reflected by the dichroic mirror 22, and is sent to the mirror 16.
The dichroic mirror 22 transmits green light while reflecting red light and blue light. The dichroic mirror 23 reflects red light and transmits blue light.

  A cooling fan 25 is provided to cool the G-LD 19, R-LED 20, and B-LD 21. The cooling fan 25 is rotated by a fan motor (M) 26, applies the generated cooling air to the elements 19 to 21 of the light source to exchange heat, and discharges the heated air to the outside of the data projector apparatus 10.

  Accordingly, the projection light driving unit 27 controls the light emission timing of each of the G-LD 19, R-LED 20, and B-LD 21 of the light source unit 15, the waveform of the driving signal, and the like. The projection light drive unit 27 performs the light emission operation of the G-LD 19, the R-LED 20, and the B-LD 21 according to a timing signal synchronized with the image signal given from the projection image drive unit 13 and the control of the CPU 33 described later. In addition to the control, the intensity of the cooling air generated by the cooling fan 25 is controlled by the rotation of the fan motor 26.

  In addition, a light receiving lens 28 is disposed so as to be adjacent to the projection lens unit 17, and, for example, a CMOS image sensor 29, which is a solid-state imaging device, is disposed at a focus position of the light receiving lens 28.

  The light receiving lens 28 and the CMOS image sensor 29 are provided so as to be able to photograph including the projection range by the projection lens unit 17, and an image signal including the projection range obtained by the photographing operation by the CMOS image sensor 29 is After being digitized by the A / D converter 30, it is sent to the imaging control unit 31.

  The imaging control unit 31 scans and drives the CMOS image sensor 29 to execute an imaging operation, and also moves the position of the light receiving lens 28 to focus an optical image incident on the CMOS image sensor 29. The drive control of the motor 32 is also performed.

  The imaging control unit 31 sends image data obtained by imaging with the CMOS image sensor 29 to the CPU 33 that controls the overall control operation of the data projector apparatus 10.

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 such as a flash ROM, and stores an operation program executed by the CPU 33, various fixed data, test chart pattern image data, a lookup table, and the like to be described later.
The standard data stored in the program memory 35 includes drive information such as drive current values of the G-LD 19, R-LED 20, and B-LD 21 and a drive voltage value of the fan motor 26 that rotates the cooling fan 25. Including.

  The CPU 33 supervises the data projector device 10 by reading out the operation program, the fixed data, etc. stored in the program memory 35, developing and storing them in the main memory 34, and executing the program. Control.

The CPU 33 executes various projection operations in accordance with key operation signals from the operation unit 36.
Operation unit 36 of this includes a remote control receiver for receiving an infrared modulated signal from a remote controller (not shown) of the data projector apparatus 10 only, the key input unit provided in, for example, the housing upper surface of the data projector apparatus 10. The operation unit 36 outputs to the CPU 33 a key operation signal based on a key operated by a user using a remote controller dedicated to the data projector device 10 or a key input unit of the main body.

The CPU 33 is further connected directly to the power control unit 38 while being 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 39 to emit sound, or generates a beep sound or the like as necessary.

  The power control unit 38 manages charging / discharging of the battery 40 which is a power source of the data projector device 10, further converts the power from the battery 40 into a necessary voltage value, stabilizes it, and supplies it to the above circuits. The power supply control unit 38 sends to the CPU 33 a voltage value between terminals indicating the exhausted state of the battery 40.

Next, the operation of the above embodiment will be described.
FIG. 2 shows the processing contents of the initial setting operation executed when the power of the data projector apparatus 10 is turned on (turned on) and the subsequent projection operation. Immediately after the power is turned on, the CPU 33 first causes the CMOS image sensor 29 to measure the brightness in the projection direction in order to grasp the installation environment of the data projector device 10 (step S101).

  In this case, AF (automatic focusing) operation by the light receiving lens 28 and its focus lens motor 32 is not required, and for example, the light receiving lens 28 is focused at a preset intermediate position, for example, a shooting distance of 2 [m]. By photographing the projection direction in a fixed state, the approximate brightness of the projection range is measured.

  Next, the CPU 33 starts the light emission operation in the light source unit 15 (step S102), reads the image data of the test chart pattern from the program memory 35, and executes projection according to the image data (step S103).

  At this stage, since the distance to the projection surface is not yet known, the focus lens position of the projection lens unit 17 is fixed at a preset intermediate position, for example, a position where the projection distance is 2 [m]. Project in state.

  The brightness in the projection direction is measured again by photographing with the CMOS image sensor 29 from this projection state, and then an appropriate exposure (AE) condition in the CMOS image sensor 29 is calculated (step S104).

  Next, the calculated AE condition is set, and a so-called contrast AF operation is performed in which the light receiving lens 28 is moved by the focus lens motor 32 so that the contrast value of the image obtained from the CMOS image sensor 29 becomes the highest.

  Based on the in-focus position thus obtained, the CPU 33 drives the focus lens of the projection lens unit 17 by the lens motor 18 to execute the AF operation of the projection image (step S105).

  Next, the CPU 33 reads the look-up table (LUT) from the program memory 35 and stores it in the main memory 34 (step S106), and then the brightness Ldk in the projection direction measured before turning on the light source unit 15, and the light source The projection mode is selected by referring to the table based on the brightness Lbr in the projection direction measured after turning on the unit 15 and the distance to the projection plane obtained by the AF operation (step S107).

FIG. 3 shows a configuration example of a lookup table read from the program memory 35.
Here, in order to simplify the explanation, an example in which there are four stages of projection modes that are variably set is shown.

  FIG. 3A shows the mode name of each projection mode, the current value of the light source (19 to 21), the driving intensity of the cooling fan 25, and an approximate value of power consumption in the light source unit 15 as a remark. The larger the value of the projection mode number, the higher the power consumption and the brighter the image can be projected.

  The current values of the light sources (19 to 21) are not set to uniform current values for the G-LD 19, R-LED 20, and B-LD 21 having different characteristics. Furthermore, it shall be set individually taking into consideration.

  FIG. 3B shows a projection based on the difference between the brightness Ldk in the projection direction measured before turning on the light source unit 15 and the brightness Lbr in the projection direction measured after turning on the light source unit 15 and the projection distance. Fig. 4 illustrates a lookup for selecting a mode.

  Here, the installation of the data projector device 10 depends on whether the difference between the brightness Ldk before the light source is turned on and the brightness Lbr after the light source is turned on is less than or equal to a preset threshold value Lth. Whether the environment is a bright environment where light other than the projection light from the data projector apparatus 10 is incident on the projection surface, such as a presentation in a conference room, or other than the light projection of the data projector apparatus 10 Whether a dark environment such as a dark room state where no light is present is distinguished, and the projection mode shown in FIG. 3A is assigned according to the projection distance depending on the distinction.

  As a matter of course, in a bright environment, it is difficult to discriminate the contents of an image unless a brighter image is projected, compared to a dark environment.

  When the projection mode is selected in this way, the CPU 33 sets the G-LD 19, R-LED 20, and B-LD 21 of the light source unit 15 with the projection light driving unit 27 so as to obtain brightness in the selected projection mode (step S 108). In order to cool the light source elements (19 to 21) with a necessary and sufficient airflow, the fan motor 26 for the cooling fan 25 is set by the projection light driving unit 27 so as to have the fan intensity in the selected projection mode. (Step S109).

  As described above, assuming that the leading end and setting of the projection mode according to the installation environment have been completed, the CPU 33 subsequently executes normal projection processing according to the image signal input from the input unit 11 (step S110). It is repeatedly determined whether or not the user has operated the key to turn off the power using the operation unit 36 (step S111) and whether or not the “AF” key has been operated to instruct the automatic focusing again (step S112). .

  If it is determined that the “AF” key has been operated, the CPU 33 determines that in step S112, and after stopping the light emission operation in the light source unit 15 (step S113), as in the initial setting of power-on (step S113). Returning to step S101, similar processing is executed.

  If it is determined in step S111 that the user has performed a key operation to turn off the power using the operation unit 36, the CPU 33 stops the light emission operation in the light source unit 15 at that time (step S114). At the same time as the processing of FIG. 2 is finished, the apparatus is turned off (disconnected).

  As described above in detail, according to this embodiment, it is possible to ensure an appropriate image quality according to the projection environment and to operate while suppressing wasteful power consumption as much as possible.

  In particular, as in this embodiment, the closer the distance to the projection surface is, the lower the brightness of the light image emitted from the projection means is. It can be avoided that the dark part becomes difficult to see.

  In this case, in the above embodiment, since the brightness of the light image is lowered by adjusting the light emission luminance of the element serving as the light source, the power consumption using the battery 40 as a power source, particularly as in the data projector device 10. Even if the apparatus is restricted, it is possible to realize image projection considering the ease of viewing while avoiding unnecessary power consumption.

  Although not shown in the above embodiment, the brightness of the light source element is kept constant, but the brightness is improved by the gradation (reflection time in the direction of the projection lens unit 17) at the micromirror element 14 as a display element. Adjustment that lowers the height is also possible. In this case, the power saving effect is not as high as when the light emission luminance of the element serving as the light source is lowered, but it is possible to realize image projection in consideration of easiness of viewing.

  Furthermore, in the said embodiment, the cooling fan 25 and the fan motor 26 are provided as what cools G-LD19, R-LED20, and B-LD21 which are light emitting elements by the light source part 15, and cooling capacity is also variable according to light emission luminance. Since it is set, wasteful power consumption can be avoided in the entire apparatus, and generation of noise by the cooling fan 25 can be suppressed to the minimum necessary.

  In addition, in the above embodiment, since the focusing means for focusing the optical image on the projection surface is provided, the distance to the projection surface can be measured without requiring a dedicated member for distance measurement.

  Further, in the above embodiment, if a photographing unit having a contrast-type automatic focusing function is provided as a means for measuring the distance to the projection surface, for example, it is used in a camera function of a mobile phone terminal or a Web camera of a personal computer. By diverting the camera mechanism unit, the distance to the projection surface can be measured relatively accurately without the need for a distance measuring member such as the active autofocus method.

  This point can also be realized by adopting the phase difference method as in the contrast method, and the imaging unit can be realized with a simple configuration.

  In any of these passive autofocus methods, the AF function itself functions in a bright environment with the light source turned on as in the above embodiment, so that the projection surface can be reliably obtained without becoming incapable of ranging. Can be measured.

  Furthermore, in the above embodiment, the brightness before and after the start of driving by the light source is detected and the difference is taken into account, and the projection mode is selected according to the distance measurement result. The projection mode can be set more finely according to the environment in which the data projector apparatus 10 is installed, such as intentionally changing the selected projection mode.

  In addition, in the above embodiment, every time the focusing function is called, the light source is turned off, and the brightness in the projection plane direction before and after the start of driving by the light source is detected, so the installation situation has changed. When there is a high possibility, the projection mode can be automatically set.

  It should be noted that, particularly when the distance to the projection surface is short and projection is performed with the brightness of the projection image lowered, image processing such as edge enhancement and color image saturation is applied to the projection image. In addition, it is possible to obtain an image that is easier to view by projecting the image.

  Moreover, although the said embodiment demonstrated the case where the automatic focusing function to which it focuses automatically was applied, it may be made to calculate the distance to a projection surface from the focused position information manually and focusing. Good.

  In addition, although the said embodiment demonstrated the case where it applied to the battery-driven DLP system data projector apparatus, this invention does not limit a drive power supply, a projector system, etc., The projection apparatus of another system, or projection The present invention can be similarly applied to various electronic devices having functions.

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

  The invention described in the claims of the present application of the present application will be appended below.

  According to a first aspect of the present invention, there is provided a projection unit that forms and projects a light image corresponding to an input image signal using light from the light source, and a measurement unit that measures the distance to the projection plane by the projection unit. And projection control means for variably setting an operation mode including brightness adjustment of a light image emitted from the projection means according to the measurement result of the measurement means.

  According to a second aspect of the present invention, in the first aspect of the present invention, the projection control means increases the brightness of the light image emitted from the projection means as the distance to the projection plane measured by the measurement means decreases. It is characterized by lowering.

  The invention according to claim 3 is the invention according to claim 2, wherein the projection control means adjusts the light emission luminance of the light source, and the closer the distance to the projection surface measured by the measurement means, the closer the projection. The brightness of the light image emitted from the means is lowered.

  According to a fourth aspect of the present invention, in the invention according to the second aspect, the projection control means adjusts the gradation of the light image emitted from the projection means as the distance to the projection surface measured by the measurement means is shorter. It is characterized by lowering the brightness.

  According to a fifth aspect of the present invention, the projector according to the first aspect further includes a cooling unit that cools the light source, and the projection control unit emits light from the projection unit according to a measurement result of the measurement unit. The operation mode including the brightness adjustment of the light image to be performed and the cooling capacity adjustment by the cooling means is variably set.

  The invention according to claim 6 is the invention according to claim 5, wherein the projection control means lowers the cooling capacity of the cooling means as the distance to the projection surface measured by the measuring means is shorter. And

  According to a seventh aspect of the present invention, in the first aspect of the present invention, the image forming apparatus further includes a focusing unit that focuses the optical image on the projection surface, and the projection control unit uses the focusing function to focus the optical image. The distance to the projection plane is calculated from the obtained position information.

  The invention according to claim 8 is the invention according to claim 7, further comprising an imaging unit for photographing the projection plane, the focusing function is a contrast-type automatic focusing function, and the measuring means includes: The distance to the projection plane is calculated from the automatically focused position information.

  The invention according to claim 9 is the invention according to claim 7, further comprising an imaging unit for photographing the projection surface, wherein the focusing function is a phase difference type automatic focusing function, and the measuring means includes The distance from the automatically focused position to the projection plane is calculated.

  A tenth aspect of the present invention is the method of the first aspect, further comprising detection means for detecting brightness in a projection plane direction before and after driving by the light source, and the projection control means includes the measurement Adjusting the brightness of the light image emitted from the projection means according to the measurement result of the means and the difference in brightness in the direction of the projection plane before and after driving by the light source detected by the detection means. Features.

  The invention described in claim 11 is the invention described in claim 10, further comprising focusing means for focusing the optical image on the projection surface and receiving means for receiving a focusing instruction using the focusing means. The projection control means turns off the light source each time it is determined that the focusing instruction is given by the reception means, and then the brightness in the direction of the projection plane before and after the detection means starts driving by the light source. And the brightness of the light image emitted from the projection means is adjusted.

  The invention according to claim 12 is a projection method in an apparatus including a light source and a projection unit that forms and projects a light image according to an input image signal using light from the light source, A measurement step of measuring a distance to the projection surface by the projection unit, and a projection control step of variably setting an operation mode including brightness adjustment of a light image emitted from the projection unit according to a measurement result in the measurement step. It is characterized by having.

  The invention described in claim 13 is a program executed by a computer built in a device including a light source and a projection unit that forms and projects a light image according to an input image signal using light from the light source. And an operation mode including brightness adjustment of a light image emitted from the projection unit in accordance with a measurement unit that measures the distance to the projection plane by the projection unit and a measurement result of the measurement unit. It functions as a projection control means for variably setting.

  DESCRIPTION OF SYMBOLS 10 ... Data projector apparatus, 11 ... Input part, 12 ... Projection image conversion part, 13 ... Projection image drive part, 14 ... Micromirror element, 15 ... Light source part, 16 ... Mirror, 17 ... Projection lens part, 18 ... Lens motor (M), 19 ... green light emitting laser diode (G-LD), 20 ... red light emitting diode (R-LED), 21 ... blue light emitting laser diode (B-LD), 22 ... dichroic mirror, 23 ... dichroic mirror, 24 DESCRIPTION OF SYMBOLS ... Mirror, 25 ... Cooling fan, 26 ... Fan motor (M), 27 ... Projection light drive part, 28 ... Light receiving lens, 29 ... CMOS image sensor, 30 ... A / D converter, 31 ... Shooting control part, 32 ... Focus lens motor (M), 33 ... CPU, 34 ... main memory, 35 ... program memory, 36 ... operation unit, 37 ... audio processing unit, 38 Power supply control unit, 39 ... speaker, 40 ... battery.

Claims (11)

A light source;
Projection means for forming and projecting a light image according to an input image signal using light from the light source;
Measuring means for measuring the distance to the projection surface by the projection means;
Projection control means for variably setting an operation mode including brightness adjustment of a light image emitted from the projection means, according to the measurement result of the measurement means;
Detecting means for detecting brightness in the direction of the projection plane before and after driving by the light source;
Focusing means for focusing the light image on the projection surface;
Receiving means for receiving a focusing operation using the focusing means,
The projection control means turns off the light source based on the focusing operation by the receiving means, and then detects the brightness in the direction of the projection plane before and after starting the driving by the light source by the detection means, and measures the measurement. A projection apparatus characterized in that the brightness of the light image emitted from the projection means is adjusted according to a measurement result of the means and a difference in brightness in the direction of the projection plane before and after driving by the light source.   2. The projection apparatus according to claim 1, wherein the projection control unit decreases the brightness of the light image emitted from the projection unit as the distance to the projection surface measured by the measurement unit is shorter.   The projection control means adjusts the light emission luminance of the light source, and lowers the brightness of the light image emitted from the projection means as the distance to the projection surface measured by the measurement means is shorter. Item 3. The projection device according to Item 2.   4. The projection control unit according to claim 2, wherein the projection control unit decreases the brightness by adjusting the gradation of a light image emitted from the projection unit as the distance to the projection surface measured by the measurement unit is shorter. Projection device. A cooling means for cooling the light source;
The projection control unit variably sets an operation mode including brightness adjustment of a light image emitted from the projection unit and cooling capacity adjustment by the cooling unit according to a measurement result by the measurement unit. The projection apparatus in any one of Claims 1-4.   6. The projection apparatus according to claim 5, wherein the projection control unit lowers the cooling capacity of the cooling unit as the distance to the projection surface measured by the measuring unit is shorter. Said projection control means, by using the focusing means, the projection apparatus according to any one of claims 1 to 4, characterized in that to calculate the distance to the projection surface from the in-focus position information. It further comprises an imaging unit for photographing the projection plane,
The focusing means executes a contrast type automatic focusing function in the imaging unit ,
The projection apparatus according to claim 7, wherein the measurement unit calculates a distance to the projection plane from the position information that is automatically focused. It further comprises an imaging unit for photographing the projection plane,
The focusing means executes an automatic focusing function of a phase difference method in the imaging unit ,
The projection apparatus according to claim 7, wherein the measurement unit calculates a distance to the projection plane from the position information that is automatically focused. A projection method in an apparatus including a light source and a projection unit that forms and projects a light image according to an input image signal using light from the light source,
A measuring step of measuring the distance to the projection surface by the projection unit;
According to the measurement result in the measurement step, a projection control step for variably setting the operation mode including the brightness adjustment of the light image emitted from the projection unit,
A detection step of detecting brightness in the direction of the projection plane before and after driving by the light source;
A focusing process for focusing the light image on the projection surface;
A receiving process for receiving a focusing operation using the focusing process;
Have
The projection control step detects the brightness in the direction of the projection plane before and after driving by the light source is detected by the detection step after the light source is turned off based on the focusing operation by the reception step, and the measurement. A projection method comprising: adjusting the brightness of a light image emitted from the projection unit according to a measurement result in the step and a difference in brightness in a projection plane direction before and after driving by the light source. A program executed by a computer built in a light source and an apparatus including a projection unit that forms and projects a light image according to an input image signal using light from the light source,
The above computer
Measuring means for measuring the distance to the projection surface by the projection unit,
Projection control means for variably setting an operation mode including brightness adjustment of a light image emitted from the projection unit according to a measurement result of the measurement means,
Detecting means for detecting brightness in the direction of the projection plane before and after driving by the light source;
Function as focusing means for focusing the light image on the projection surface, and receiving means for receiving a focusing operation using the focusing means,
The projection control means turns off the light source based on the focusing operation by the receiving means, and then detects the brightness in the direction of the projection plane before and after starting the driving by the light source by the detection means, and measures the measurement. A program for adjusting the brightness of a light image emitted from the projection unit according to a measurement result of the means and a difference in brightness in a projection plane direction before and after driving by the light source.

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