WO2017000812A1 - 一种投影仪的控制方法及适用于该方法的投影仪 - Google Patents

一种投影仪的控制方法及适用于该方法的投影仪 Download PDF

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WO2017000812A1
WO2017000812A1 PCT/CN2016/086623 CN2016086623W WO2017000812A1 WO 2017000812 A1 WO2017000812 A1 WO 2017000812A1 CN 2016086623 W CN2016086623 W CN 2016086623W WO 2017000812 A1 WO2017000812 A1 WO 2017000812A1
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projector
ave
rgb
image
current environment
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PCT/CN2016/086623
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English (en)
French (fr)
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唐金腾
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芋头科技（杭州）有限公司
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Priority to US15/740,244 priority Critical patent/US10194122B2/en
Priority to JP2017567756A priority patent/JP6623239B2/ja
Priority to EP16817176.7A priority patent/EP3319316A4/en
Publication of WO2017000812A1 publication Critical patent/WO2017000812A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3179—Video signal processing therefor
    • H04N9/3182—Colour adjustment, e.g. white balance, shading or gamut
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3191—Testing thereof
    • H04N9/3194—Testing thereof including sensor feedback
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/64—Circuits for processing colour signals
    • H04N9/73—Colour balance circuits, e.g. white balance circuits or colour temperature control

Definitions

  • the present invention relates to the field of projector devices, and in particular, to a projector control method and a projector suitable for the method.
  • CRT is the abbreviation of English Cathode Ray Tube, translated as cathode ray tube.
  • This kind of projector can decompose the input signal source into the fluorescent screens of three CRT tubes of R (red) and G (green) B (blue).
  • the phosphor is amplified, concentrated, and displayed on the large screen under the action of high voltage. Color image.
  • the optical system and the CRT tube form a projection tube.
  • the so-called three-gun projector is a projector composed of three projection tubes. Because of the use of the internal light source, it is also called an active projection method.
  • the CRT technology is mature, the displayed image is rich in color, good in reductibility, and has rich geometric distortion adjustment capability, but its important technical indicators image resolution and brightness mutually restrict each other, directly affecting the brightness value of the CRT projector, so far, its brightness The value is always below 300Lm.
  • the operation of the CRT projector is complicated, especially the convergence adjustment is cumbersome, the body is large, and it is only suitable for installation in a place where the ambient light is relatively weak and relatively fixed, and it is not suitable for moving.
  • LCD is the abbreviation of Liquid Crystal Device.
  • LCD projectors are divided into liquid crystal panels and liquid crystal light valves.
  • Liquid crystal is a substance between liquid and solid. It does not emit light by itself.
  • the working property is greatly affected by temperature. Its working temperature is -55 °C ⁇ +77 °C.
  • the projector uses the photoelectric effect of the liquid crystal, that is, the arrangement of the liquid crystal molecules changes under the action of the electric field, affecting the transmittance or reflectance of the liquid crystal cell, and affecting its optical properties when the machine is driven, resulting in different gray levels and colors. image.
  • DLP is the abbreviation of English Digital Light Processor, translated as digital light processor. The birth of this new projection technology enabled us to finally display digital information after we have the ability to capture, receive, and store digital information. DLP technology is an epoch-making revolution in the field of display. Just as CDs have had a huge impact in the audio field, DLP will open a new page for video projection display. Its technical key points for DMD (Digital Micromirror Device) digital micro-reflector as a light valve imaging device DLP projector are as follows: First, the digital advantage.
  • the adoption of digital technology makes the gray level of the image reach 256-1024, the color reaches 2563-10243, the image noise disappears, the picture quality is stable, the accurate digital image can be continuously reproduced, and it is timeless.
  • Second is the advantage of reflection.
  • the application of the reflective DMD device enables the total light efficiency of the imaging device to be more than 60%, and the uniformity of contrast and brightness is excellent.
  • On the DMD block each pixel has an area of 16 ⁇ m ⁇ 16 ⁇ m and an interval of 1 ⁇ m.
  • DLP projectors can be divided into: single-chip, two-chip, three-chip.
  • the DLP projector has high definition, uniform image and sharp color.
  • the brightness of the three-chip machine can reach more than 1000lm.
  • all types of projectors display the same principle.
  • the projector first emits light onto the image display element to produce an image, which is then projected through the lens.
  • the image display element of the projector includes a transmissive type that generates an image by light transmission and a reflective type that generates an image using the reflected light. Either type, the light of the projector is divided into three colors of red, green and blue, and then images of various colors are produced. Since the component itself can only be displayed in a single color, it is necessary to generate three color components by using three color components. The three color images are then combined into one image by a prism and finally projected onto the screen through the lens.
  • the projector needs to project an image onto a white screen to maximize the quality of the projected image.
  • the screen is not white, such as the screen is yellow, red, green, or the surrounding environment is yellow, red, etc.
  • the quality of the projected image will be affected by the color of the screen or the color of the ambient light, resulting in image distortion.
  • the reason for the image distortion is that the projector does not have the function of automatically white balance according to the screen color or the ambient light color.
  • the projector simply projects the original image as realistic as possible. There is no adaptive self-adjustment capability for different color screens or ambient light of different colors.
  • the present application provides a method for controlling a projector, including the steps of:
  • S2 starting the sensing module to obtain an output image or a current environment image
  • the step S3 comprises the steps of:
  • the present invention also provides a projector suitable for the control method of the projector, comprising a projector body for projecting to a screen, characterized in that it further comprises a sensing module, wherein the sensing module is located at the On the projector body, for acquiring the output image or the current environment image;
  • the control device processes the output image or the current environment image, obtains gain coefficients of three channels of RGB in the projector after calculation, and adjusts gains of the three channels of the RGB according to the gain coefficient.
  • control device comprises:
  • Reading unit acquiring the RGB component of the output image or the current environment image
  • a calculating unit calculating the gray value Gary of the output image or the current environment image
  • a coefficient acquiring unit calculates the gain coefficients K r , K g , K b of the three channels R, G, and B according to the respective average values of the gray value Gary and the RGB components;
  • the adjusting unit adjusts the R, G, and B gains of each pixel in the projected image according to the gain coefficients K r , K g , and K b of the three channels.
  • the sensing module is an RGB light sensor.
  • the sensing module is an RGB optical sensing matrix.
  • the sensing module is a camera.
  • the direction of the sensing module is the same as the projection direction of the projector body.
  • the present patent application describes a projector control method and a projector suitable for the method, and the beneficial effects are as follows: if the sensing module 2 collects an output image Then, the projector can make the projection screen no longer limited by color, that is, with the projector, the screen of various colors can be freely selected, and the influence effect of the projection is not affected; if the transmission is The sensor module 2 collects the current environment image, and the invention can also remove the influence of the color temperature of the ambient light on the projection effect.
  • FIG. 1 is a flow chart 1 of a control method of a projector according to the present invention.
  • FIG. 2 is a second flowchart of a control method of a projector according to the present invention.
  • Figure 3 is a schematic structural view 1 of a projector of the present invention.
  • FIG. 4 is a schematic structural view 2 of a projector of the present invention.
  • a method for controlling a projector includes the steps of:
  • S2 starting the sensing module 2 to obtain an output image or a current environment image
  • the step S3 includes the following steps:
  • the projector is first activated to project on the screen.
  • the sensing module 2 is activated to acquire an output image or a current environment image, and process the output image or the current environment image to obtain RGB components thereof, and calculate respective average values R ave , G ave , and B ave of the RGB components.
  • the control method of the projector if the output image is acquired in step S2, the method makes the projection screen no longer limited by color, that is, using this method, the screen of various colors can be freely selected, and the influence of the projection The effect will not be affected. If the current environmental image is acquired in step S2, the present invention is also capable of removing the influence of the color temperature of the ambient light on the projection effect.
  • a control method of a projector is proposed.
  • This embodiment proposes a projector suitable for the control method.
  • the projector includes:
  • a projector body 1 for projecting to a screen
  • a sensing module 2 on the projector body 1, for acquiring the output image or the current environment image
  • the control module 3 processes the output image or the current environment image, obtains gain coefficients of three channels of RGB in the projector after calculation, and adjusts gains of the three channels of the RGB according to the gain coefficient .
  • the control module 3 includes:
  • the reading unit 31 acquires an RGB component of the output image or the current environment image
  • the statistic unit 32 calculates statistical average values R ave , G ave , B ave of the RGB components;
  • the calculating unit 33 is configured to calculate the gray value Gary of the output image or the current environment image
  • the coefficient obtaining unit 34 calculates the gain coefficients K r , K g , K b of the three channels R, G, and B according to the respective average values of the gray value Gary and RGB components;
  • the adjusting unit 35 adjusts the R, G, and B gains of each pixel in the projected image according to the gain coefficients K r , K g , and K b of the three channels.
  • the sensing module 2 is three RGB light sensors, which are simple to implement and low in cost, but have low precision.
  • the sensing module 2 can also be a matrix of RGB light sensors or a camera. The accuracy of the latter two is higher than the former, and the final gain effect will be better, but the cost is higher than the previous one.
  • the position setting of the sensing module 2 should also be different depending on the application. When it is required to realize automatic white balance of the screen color, the sensing module 2 needs to acquire the output image, and then the sensing module 2 needs to face the projection direction of the projector body 1; When the ambient light is automatically white balanced, the sensing module 2 needs to acquire the current environment image, and then the position and direction of the sensing module 2 need not be strictly set.
  • the projector body 1 projects to the screen
  • the sensing module 2 captures an output image or a current environment image
  • the reading unit 31 reads the RGB components of the acquired image and transmits them to the camera.
  • the statistic unit 32 after which the statistic unit 32 counts the respective average values R ave , G ave , B ave of the RGB components, and the calculating unit 33 acquires the images acquired by the sensing module 2 according to the three average values.
  • the gray value Gary, the respective average values R ave , G ave , B ave of the RGB components and the gray value Gary of the image are transmitted to the coefficient acquisition unit 34, and the gain coefficients K r of the three channels R, G, and B are calculated. , K g , K b .
  • the adjusting unit 35 adjusts the R, G, and B gains of each pixel in the projected image according to K r , K g , and K b .
  • the projector can make the projection screen no longer limited by color, that is, with the projector, the screen of various colors can be freely selected, and the influence of the projection The effect will not be affected. If the sensing module 2 captures the current environmental image, the present invention can also remove the influence of the color temperature of the ambient light on the projection effect. The use of the projector makes the projection screen no longer limited by color, that is, with such a projector, the screen of various colors can be freely selected, and the effect of the projection is not affected. In addition, the projector can also remove the influence of the color temperature of the ambient light on the projection effect, and greatly improve the projection effect.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)
  • Projection Apparatus (AREA)
  • Controls And Circuits For Display Device (AREA)
  • Processing Of Color Television Signals (AREA)

Abstract

本发明提供了一种投影仪的控制方法及适用于该方法的投影仪，包括步骤：启动投影仪，在屏幕上投影；启动传感模块，获得输出图像或当前环境图像；对所述输出图像或者所述当前环境图像进行处理获取RGB分量，并根据自动白平衡算法，计算RGB三个通道的增益系数；根据所述增益系数，调整所述投影仪中RGB三个通道的增益。采用本方法及所述投影仪使得投影屏幕不再受颜色的限制，即可以自由选择各种颜色的屏幕，投影的影响效果均不会收到影响；此外，所述投影仪还能够去除周围环境光线的色温对投影效果的影响，大幅提高投影效果。

Description

一种投影仪的控制方法及适用于该方法的投影仪 技术领域
本发明涉及投影仪装置技术领域，尤其涉及一种投影仪的控制方法及适用于该方法的投影仪。
背景技术
目前为止，投影机主要通过三种显示技术实现，即CRT投影技术、LCD投影技术以及近些年发展起来的DLP投影技术。
CRT是英文Cathode Ray Tube的缩写，译作阴极射线管。作为成像器件，它是实现最早、应用最为广泛的一种显示技术。这种投影机可把输入信号源分解成R(红)、G(绿)B(蓝)三个CRT管的荧光屏上，荧光粉在高压作用下发光系统放大、会聚、在大屏幕上显示出彩色图像。光学系统与CRT管组成投影管，通常所说的三枪投影机就是由三个投影管组成的投影机，由于使用内光源，也叫主动式投影方式。CRT技术成熟，显示的图像色彩丰富，还原性好，具有丰富的几何失真调整能力，但其重要技术指标图像分辨率与亮度相互制约，直接影响CRT投影机的亮度值，到目前为止，其亮度值始终徘徊在300Lm以下。另外CRT投影机操作复杂，特别是会聚调整繁琐，机身体积大，只适合安装于环境光较弱、相对固定的场所，不宜搬动。
LCD是Liquid Crystal Device的英文缩写。LCD投影机分为液晶板和液晶光阀两种。液晶是介于液体和固体之间的物质，本身不发光，工作性质受温度影响很大，其工作温度为-55℃～+77℃。投影机利用液晶的光电效应，即液晶分子的排列在电场作用下发生变化，影响其液晶单元的透光率或反射率，从机时影响它的光学性质，产生具有不同灰度层次及颜色的图像。
DLP是英文Digital Light Processor的缩写，译作数字光处理器。这一新的投影技术的诞生，使我们在拥有捕捉、接收、存储数字信息的能力后，终于实现了数字信息显示。DLP技术是显示领域划时代的革命，正如CD在音频领域产生的巨大影响一样，DLP将为视频投影显示翻开新的一页。它以DMD(Digital Micromirror Device)数字微反射器作为光阀成像器件DLP投影机的技术关键点如下：首先是数字优势。数字技术的采用，使图像灰度等级达256-1024级，色彩达2563-10243种，图像噪声消失，画面质量稳定，精确的数字图像可不断再现，而且历久弥新。其次是反射优势。反射式DMD器件的应用，使成像器件的总光效率达60％以上，对比度和亮度的均匀性都非常出色。在DMD块上，每一个像素的面积为16μm×16μm，间隔为1μm。根据所用DMD的片数，DLP投影机可分为：单片机、两片机、三片机。DLP投影机清晰度高、画面均匀，色彩锐利，三片机亮度可达1000lm以上， 它抛弃了传统意义上的会聚，可随意变焦，调整十分便利；只是分辨率不高，不经压缩分辨率为800×600(有些机型的最新产品的分辨率已经达到1280×1024)。但由于是新技术，维修的难度及费用并不低。
基本上所有类型的投影机显示图像的原理都一样。投影机先将光线照射到图像显示元件上来产生影像，然后通过镜头进行投影。投影机的图像显示元件包括利用透光产生图像的透过型和利用反射光产生图像的反射型。无论哪一种类型，都是将投影灯的光线分成红、绿、蓝三色，再产生各种颜色的图像。因为元件本身只能进行单色显示，因此就要利用3色元件分别生成3色成分。然后再通过棱镜将这3色图像合成为一个图像，最后通过镜头投影到屏幕上。
以DLP投影仪为例，投影仪需要把影像投射到白色的屏幕上，才能最大限度的保证投射的影像质量。当屏幕不是白色，如屏幕是黄色、红色、绿色，或者周围环境有黄色、红色的等干扰时。投影出来的影像质量就会受屏幕颜色，或者环境光颜色影响，而产生图像失真。
产生图像失真的原因是投影仪没有根据屏幕颜色，或者环境光颜色自动白平衡的功能。投影仪只是把原始影像以尽可能的逼真程度投射出去，对于不同颜色的屏幕，或者不同颜色的环境光，没有自适应自调节能力。
发明内容
针对上述技术问题，本申请提供了一种投影仪的控制方法，包括步骤：
S1：启动投影仪，在屏幕上投影；
S2：启动传感模块，获得输出图像或当前环境图像；
S3：对所述输出图像或者所述当前环境图像进行处理获取RGB分量，并根据自动白平衡算法，计算RGB三个通道的增益系数；
S4：根据所述增益系数，调整所述投影仪中RGB三个通道的增益。
较佳的，所述步骤S3包括步骤：
S31：获取所述输出图像或者所述当前环境图像的RGB分量；
S32：统计所述RGB分量的各个平均值Rave、Gave、Bave；
S33：计算所述输出图像或者所述当前环境图像的灰度值Gary；
S34：根据所述灰度值Gary和RGB分量的各个平均值，计算R、G、B三个通道的增益系数Kr、Kg、Kb；
S35：根据三个通道的所述增益系数Kr、Kg、Kb，调整投影图像中每个像素的R、G、B增益。
较佳的，在所述步骤S33中，所述灰度值Gary的计算公式为：Gray＝(Rave+Gave+Bave)/3。
较佳的，在所述步骤S34中，所述增益系数Kr、Kg、Kb的计算公式分别为：kr＝Gray/Rave； kg＝Gray/Gave；kb＝Gray/Bave。
本发明还提供了一种投影仪，适用于所述的投影仪的控制方法，包括投影仪本体，用于向屏幕进行投影，其特征在于，还包括传感模块，所述传感模块位于所述投影仪本体上，用于获取所述输出图像或所述当前环境图像；以及
控制装置，对所述输出图像或所述当前环境图像进行处理，经计算后获得所述投影仪中RGB三个通道的增益系数，并根据所述增益系数调整所述RGB三个通道的增益。
较佳的，所述控制装置包括：
读取单元，获取所述输出图像或者所述当前环境图像的所述RGB分量；
统计单元，统计所述RGB分量的各个平均值Rave、Gave、Bave；
计算单元，计算所述输出图像或者所述当前环境图像的所述灰度值Gary；
系数获取单元，根据所述灰度值Gary和所述RGB分量的各个平均值，计算R、G、B三个通道的增益系数Kr、Kg、Kb；
调整单元，根据三个通道的所述增益系数Kr、Kg、Kb，调整投影图像中每个像素的R、G、B增益。
较佳的，所述传感模块为RGB光传感器。
较佳的，所述传感模块为RGB光传感矩阵。
较佳的，所述传感模块为摄像头。
较佳的，所述传感模块的方向和所述投影仪本体的投影方向相同。
综上所述，由于采用了上述技术方案，本专利申请记载了一种投影仪的控制方法及适用于该方法的投影仪，其有益效果有：如果所述传感模块2采集的是输出图像，那么所述投影仪可以使得投影屏幕不再受颜色的限制，即采用这种所述投影仪，可以自由选择各种颜色的屏幕，投影的影响效果均不会收到影响；如果所述传感模块2采集的是当前环境图像，本发明还能够去除周围环境光线的色温对投影效果的影响
附图说明
图1是本发明一种投影仪的控制方法流程图一；
图2是本发明一种投影仪的控制方法流程图二；
图3是本发明一种投影仪的结构示意图一；
图4是本发明一种投影仪的结构示意图二。
具体实施方式
本申请中提出了一种投影仪的控制方法及适用于该方法的投影仪，下面结合附图对本发明的具体实施方式作进一步的说明。
实施例一
如图1所示，一种投影仪的控制方法，包括步骤：
S1：启动投影仪，在屏幕上投影；
S2：启动传感模块2，获得输出图像或当前环境图像；
S3：根据自动白平衡算法，计算RGB三个通道的增益系数；
S4：根据所述增益系数，调整所述投影仪中RGB通道的增益。
如图2所示，其中，所述步骤S3包括步骤：
S31：获取所述输出图像或者所述当前环境图像的RGB分量；
S32：统计所述RGB分量的各个平均值Rave、Gave、Bave；
S33：计算所述输出图像或者当前环境的灰度值Gary，其中Gray＝(Rave+Gave+Bave)/3；
S34：计算R、G、B三个通道的增益系数Kr、Kg、Kb：kr＝Gray/Rave，kg＝Gray/Gave，kb＝Gray/Bave；
S35：根据三个通道的增益系数Kr、Kg、Kb，调整投影图像中每个像素的R、G、B增益。
工作时，首先启动所述投影仪，使其在屏幕上进行投影。然后启动所述传感模块2，获取输出图像或者当前环境图像，并对所述输出图像或者当前环境图像进行处理获得其RGB分量，计算RGB分量的各个平均值Rave、Gave、Bave。假设任意一副图像，当它有足够的色彩变化时，它的RGB分量的均值会趋于同一灰度值Gray，所以所述输出图像或者当前环境的灰度值Gary＝(Rave+Gave+Bave)/3。计算R、G、B三个通道的增益系数Kr、Kg、Kb，最后根据这三个增益系数调整投影图像中每个像素的R、G、B增益，从而实现了投影仪的自动白平衡。所述投影仪的控制方法，如果在步骤S2中采集的是输出图像，那么本方法使得投影屏幕不再受颜色的限制，即采用这种方法，可以自由选择各种颜色的屏幕，投影的影响效果均不会收到影响。如果在步骤S2中采集的是当前环境图像，本发明还能够去除周围环境光线的色温对投影效果的影响。
实施例二
根据上述实施例提出了一种投影仪的控制方法，本实施例提出了一种适用于所述控制方法的投影仪。
所述投影仪包括：
投影仪本体1，用于向屏幕进行投影；
传感模块2，所述投影仪本体1上，用于获取所述输出图像或所述当前环境图像；
控制模块3，对所述输出图像或所述当前环境图像进行处理，经计算后获得所述投影仪中RGB三个通道的增益系数，并根据所述增益系数调整所述RGB三个通道的增益。
其中，所述控制模块3包括：
读取单元31，获取所述输出图像或者所述当前环境图像的RGB分量；
统计单元32，统计所述RGB分量的各个平均值Rave、Gave、Bave；
计算单元33，计算所述输出图像或者所述当前环境图像的所述灰度值Gary；
系数获取单元34，根据所述灰度值Gary和RGB分量的各个平均值，计算R、G、B三个通道的增益系数Kr、Kg、Kb；
调整单元35，根据三个通道的所述增益系数Kr、Kg、Kb，调整投影图像中每个像素的R、G、B增益。
其中，所述计算单元33对所述灰度值Gary的计算公式为：Gary＝(Rave+Gave+Bave)/3，所述系数获取单元34对R、G、B三个通道的增益系数Kr、Kg、Kb的计算公式分别为：kr＝Gray/Rave，kg＝Gray/Gave，kb＝Gray/Bave。
所述传感模块2是三个RGB光传感器，所述RGB光传感器实现简单，成本低廉，但是其精度也较低。所述传感模块2还可以为RGB光传感器矩阵，也可以为摄像头。后两者的精度相比前者要高，最终的增益效果也会更好，但是其成本较之前者也更高。根据不同的应用，所述传感模块2的位置设置也应有所不同。当需要实现对屏幕颜色自动白平衡时，所述传感模块2需要获取所述输出图像，那么此时所述传感模块2需要正对着所述投影仪本体1的投射方向；当需要实现对环境光自动白平衡的时候，所述传感模块2需要获取当前环境图像，那么此时所述传感模块2的位置和方向不需要进行严格设置。
工作时，所述投影仪本体1向屏幕进行投影，所述传感模块2采集输出图像或者当前环境图像，所述读取单元31读取所采集到的图像的RGB分量并将其传递至所述统计单元32，之后所述统计单元32统计RGB分量的各个平均值Rave、Gave、Bave，所述计算单元33根据这三个平均值获取所述传感模块2采集到的图像的灰度值Gary，将RGB分量的各个平均值Rave、Gave、Bave以及图像的灰度值Gary传递至所述系数获取单元34，计算R、G、B三个通道的增益系数Kr、Kg、Kb。最后，所述调整单元35根据Kr、Kg、Kb，调整投影图像中每个像素的R、G、B增益。通过调整投影图像中像素的R、G、B增益，
如果所述传感模块2采集的是输出图像，那么所述投影仪可以使得投影屏幕不再受颜色的限制，即采用这种所述投影仪，可以自由选择各种颜色的屏幕，投影的影响效果均不会收到影响。如果所述传感模块2采集的是当前环境图像，本发明还能够去除周围环境光线的色温对投影效果的影响。采用所述投影仪使得投影屏幕不再受颜色的限制，即采用这种投影仪，可以自由选择各种颜色的屏幕，投影的影响效果均不会收到影响。此外，所述投影仪还能够去除周围环境光线的色温对投影效果的影响，大幅提高投影效果。
以上所述仅为本发明较佳的实施例，并非因此限制本发明的实施方式及保护范围，对于本领域技术人员而言，应当能够意识到凡运用本发明说明书及图示内容所做出的等同替换和显而易见的变化所得到的方案，均应当包含在本发明的保护范围内。

Claims (10)

  1. 一种投影仪的控制方法，其特征在于，包括步骤：
    S1：启动投影仪，在屏幕上投影；
    S2：启动传感模块，获得输出图像或当前环境图像；
    S3：对所述输出图像或者所述当前环境图像进行处理获取RGB分量，并根据自动白平衡算法，计算RGB三个通道的增益系数；
    S4：根据所述增益系数，调整所述投影仪中RGB三个通道的增益。
  2. 根据权利要求1所述的投影仪的控制方法，其特征在于，步骤S3包括步骤：
    S31：获取所述输出图像或者所述当前环境图像的RGB分量；
    S32：统计所述RGB分量的各个平均值Rave、Gave、Bave；
    S33：计算所述输出图像或者所述当前环境图像的灰度值Gary；
    S34：根据所述灰度值Gary和所述RGB分量的各个平均值，计算出R通道的增益系数Kr，计算出G通道的增益系数Kg，计算出B通道的增益系数Kb；
    S35：根据所述增益系数Kr、所述增益系数Kg和所述增益系数Kb，调整投影图像中每个像素的R、G、B增益。
  3. 根据权利要求2所述的投影仪的控制方法，其特征在于，在步骤S33中，所述灰度值Gary的计算公式为：Gray＝(Rave+Gave+Bave)/3。
  4. 根据权利要求2所述的投影仪的控制方法，其特征在于，在步骤S34中，所述增益系数Kr、Kg、Kb的计算公式分别为：kr＝Gray/Rave；kg＝Gray/Gave；kb＝Gray/Bave。
  5. 一种投影仪，包括投影仪本体，用于向屏幕进行投影，其特征在于，还包括传感模块，所述传感模块位于所述投影仪本体上，用于获取输出图像或当前环境图像；以及
    控制装置，与所述传感模块相连，对所述输出图像或所述当前环境图像进行处理，经计算后获得所述投影仪中RGB三个通道的增益系数，并根据所述增益系数调整所述RGB三个通道的增益。
  6. 根据权利要求5所述的投影仪，其特征在于，所述控制装置包括：
    读取单元，用以获取所述输出图像或者所述当前环境图像的所述RGB分量；
    统计单元，与所述读取单元相连，用以统计所述RGB分量的各个平均值Rave、Gave、Bave；
    计算单元，与所述统计单元相连，用以计算所述输出图像或者所述当前环境图像的所述灰度值Gary；
    系数获取单元，与所述计算单元相连，用以根据所述灰度值Gary和所述RGB分量的各个平均值，计算R、G、B三个通道的增益系数Kr、Kg、Kb；
    调整单元，与所述系数获取单元相连，用以根据三个通道的所述增益系数Kr、Kg、Kb，调整投影图像中每个像素的R、G、B增益。
  7. 根据权利要求5所述的投影仪，其特征在于，所述传感模块为RGB光传感器。
  8. 根据权利要求5所述的投影仪，其特征在于，所述传感模块为RGB光传感矩阵。
  9. 根据权利要求5所述的投影仪，其特征在于，所述传感模块为摄像头。
  10. 根据权利要求9所述的投影仪，其特征在于，所述传感模块的方向和所述投影仪本体的投影方向相同。
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