WO2017114256A1 - 一种投影亮度调节方法及装置 - Google Patents

一种投影亮度调节方法及装置 Download PDF

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Publication number
WO2017114256A1
WO2017114256A1 PCT/CN2016/111252 CN2016111252W WO2017114256A1 WO 2017114256 A1 WO2017114256 A1 WO 2017114256A1 CN 2016111252 W CN2016111252 W CN 2016111252W WO 2017114256 A1 WO2017114256 A1 WO 2017114256A1
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Prior art keywords
projection
value
brightness
ambient light
preset
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PCT/CN2016/111252
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English (en)
French (fr)
Inventor
姜訢
赵宝莹
黄永顺
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Beijing Asu Tech Co Ltd
Qingdao Haier Co Ltd
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Beijing Asu Tech Co Ltd
Qingdao Haier Co Ltd
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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]
    • H04N9/3179—Video signal processing therefor
    • H04N9/3182—Colour adjustment, e.g. white balance, shading or gamut
    • 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
    • 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]

Definitions

  • the present invention relates to the field of projection technology, and in particular, to a projection brightness adjustment method and apparatus.
  • the subjective quality of the projected image is affected by various factors such as the projected brightness and the image brightness of the original projected image when the image is projected on the projection background, in order to make the projected image have better subjective quality and better for the user.
  • the user experience needs to adjust the projection brightness according to the current projection environment factor during the projection process.
  • Embodiments of the present invention disclose a projection brightness adjustment method and apparatus for adjusting projection brightness to obtain a projected image having better subjective quality.
  • the embodiment of the invention discloses a method for adjusting the brightness of a projection, the method comprising:
  • the projection brightness is adjusted according to the projected brightness value.
  • the obtaining a projection brightness value according to the ambient light brightness value and the projection distance value includes:
  • Obtaining a projection brightness value according to the ambient light brightness value and the projection distance value in a preset data table wherein the preset data table is: for recording a projection brightness value, an ambient light brightness value, and a projection distance a data table of the correspondence between the three values;
  • the preset first transform function is: the projected brightness is related to ambient light brightness and projection The transformation function of the distance;
  • obtaining picture information of the image to be projected and obtaining a projection brightness value according to the picture information, the ambient light brightness value, the projection distance value, and a preset second transform function, the preset second transform
  • the function is: a transformation function of the projection brightness with respect to ambient light brightness and projection distance.
  • the preset data table is obtained by:
  • the preset data table is obtained according to the generated correspondence.
  • the preset first transform function is obtained by the following steps:
  • the projection distance value is a preset projection distance value
  • the ambient light brightness value is changed according to a preset ambient light brightness conversion rule, and a projection brightness value corresponding to each changed ambient light brightness value is obtained.
  • a curve fitting is performed on the obtained projection brightness value and the corresponding ambient light brightness value, and a function f(AL) of the projection brightness on the ambient light brightness is obtained, wherein AL represents an environment. brightness;
  • the projection distance value is changed according to a preset projection distance value conversion rule, and a projection brightness value corresponding to each changed projection distance value is obtained.
  • the preset first transform function is obtained according to the function f(AL) and the function g(D).
  • the obtaining the preset transform function according to the function f(AL) and the function g(D) includes:
  • the obtaining the screen information of the image to be projected, and obtaining the projection according to the screen information, the ambient light luminance value, the projection distance value, and a preset second transformation function Brightness values including:
  • a projection luminance value is obtained according to the adjustment coefficient, the ambient light luminance value, the projection distance value, and a preset second transformation function.
  • the embodiment of the invention discloses a projection brightness adjusting device, and the device comprises:
  • a parameter value obtaining module for obtaining an ambient light brightness value and obtaining a projected distance value
  • a projection brightness value obtaining module configured to obtain a projected brightness value according to the ambient light brightness value and the projected distance value
  • a projection brightness adjustment module is configured to adjust the projection brightness according to the projected brightness value.
  • the projection brightness value obtaining module is specifically configured to:
  • Obtaining a projection brightness value according to the ambient light brightness value and the projection distance value in a preset data table wherein the preset data table is: for recording a projection brightness value, an ambient light brightness value, and a projection distance a data table of the correspondence between the three values;
  • the preset first transform function is: the projected brightness is related to ambient light brightness and projection The transformation function of the distance;
  • obtaining picture information of the image to be projected and obtaining a projection brightness value according to the picture information, the ambient light brightness value, the projection distance value, and a preset second transform function, the preset second transform
  • the function is: a transformation function of the projection brightness with respect to ambient light brightness and projection distance.
  • the projection brightness adjustment device further includes:
  • a data table obtaining module configured to obtain the preset data table
  • the data table obtaining module includes:
  • the first projection brightness value obtaining sub-module is configured to obtain different brightness values of the ambient light and projection brightness values in the case of different projection distance values according to a preset test rule;
  • Corresponding relationship generation sub-module configured to generate a corresponding correspondence relationship between the obtained projection brightness according to the obtained projection brightness and the corresponding ambient light brightness and the corresponding projection distance;
  • the data table obtains a submodule for obtaining the preset data table according to the generated correspondence.
  • the projection brightness adjustment device further includes:
  • a transformation function obtaining module configured to obtain the preset first transformation function
  • the conversion function obtaining module includes:
  • a second projection brightness value obtaining sub-module configured to change the ambient light brightness value according to a preset ambient light brightness conversion rule, and obtain each changed after the projection distance value is a preset projection distance value a projected brightness value corresponding to the ambient light brightness value;
  • the first function obtains a sub-module for performing curve fitting on the obtained projection brightness value and the corresponding ambient light brightness value according to a preset first curve fitting algorithm, and obtaining a function of the projection brightness with respect to the ambient light brightness.
  • AL represents ambient light brightness
  • a third projection brightness value obtaining sub-module configured to change the projection distance value according to a preset projection distance value conversion rule, and obtain each changed after the ambient light brightness value is a preset ambient light brightness value
  • the projection distance value Corresponding projection brightness value
  • the second function obtains a sub-module for performing curve fitting on the obtained projection brightness value and the corresponding projection distance value according to a preset second curve fitting algorithm, and obtaining a function g (D) of the projection brightness with respect to the projection distance. ), where D represents the projection distance;
  • the transform function obtains a submodule for obtaining the preset first transform function according to the function f(AL) and the function g(D).
  • the transform function obtains a sub-module, and is specifically configured to obtain the preset first transform function L(AL, D) according to the following expression,
  • the projection brightness value obtaining module includes:
  • an image information obtaining sub-module configured to obtain a color histogram statistical value of the image to be projected and/or an image picture complexity of the image to be projected
  • An adjustment coefficient determining submodule configured to determine an adjustment coefficient according to the color histogram statistical value and/or the image picture complexity
  • a fourth projection brightness value obtaining submodule configured to obtain a projection brightness value according to the adjustment coefficient, the ambient light brightness value, the projection distance value, and a preset second transformation function.
  • Embodiments of the present invention provide a projection brightness adjustment method and apparatus, which first obtain an ambient light brightness value and a projection distance value; and then obtain a projected brightness value according to the obtained ambient light brightness value and the projected distance value; The projection brightness value adjusts the projection brightness. It can be seen that the embodiment of the present invention can adjust the projection brightness according to the ambient light brightness and the projection distance, and therefore, a projection image with better subjective quality can be obtained.
  • FIG. 1 is a schematic flowchart of a method for adjusting a projection brightness according to an embodiment of the present invention.
  • FIG. 2 is a diagram showing changes in relationship between projection brightness and ambient light brightness according to an embodiment of the present invention.
  • FIG. 3 is a diagram showing a relationship between a projection brightness and a projection distance according to an embodiment of the present invention.
  • FIG. 4 is a schematic flowchart of a method for obtaining a preset first transform function according to an embodiment of the present invention.
  • FIG. 5 is a sensitivity curve of a human eye receiving an optical signal according to an embodiment of the present invention.
  • FIG. 6 is an example of a color histogram of a projected image according to an embodiment of the present invention.
  • FIG. 7 is an example of a color histogram of another projected image according to an embodiment of the present invention.
  • FIG. 8 is a schematic structural diagram of a projection brightness adjusting apparatus according to an embodiment of the present invention.
  • FIG. 9 is a schematic structural diagram of a transform function obtaining module according to an embodiment of the present invention.
  • Embodiments of the present invention provide a projection brightness adjustment method and apparatus, which first obtain an ambient light brightness value and a projection distance value; and then obtain a projected brightness value according to the obtained ambient light brightness value and the projected distance value; The projection brightness value adjusts the projection brightness. It can be seen that the embodiment of the present invention can adjust the projection brightness according to the ambient light brightness and the projection distance, and therefore, a projection image with better subjective quality can be obtained.
  • FIG. 1 is a schematic flowchart of a method for adjusting a projection brightness according to an embodiment of the present invention, including the following steps:
  • the projection brightness of the projector is affected by the ambient light brightness and the projection distance. Under different ambient light and different projection distances, the projector needs to project with different projection lights to obtain Better projection effect.
  • the applicant has a certain relationship between the projection brightness and the ambient light brightness. There is also a certain relationship between the projection brightness and the projection distance.
  • FIG. 2 a relationship diagram between the brightness of the projection and the brightness of the ambient light is provided. It can be intuitively found from the figure that the brightness value of the projection increases as the brightness value of the ambient light increases; As shown in FIG. 3, a graph showing the relationship between the projection brightness and the projection distance is provided. It can be seen from the figure that the projection brightness value also increases as the projection distance value increases.
  • the projection brightness increases with the increase of the ambient light brightness, it increases with the increase of the projection distance, but the increase range is different. Specifically, it can be seen from FIG. 2 and FIG. As the brightness of the ambient light increases, the increase of the projection brightness becomes smaller, and as the projection distance increases, the increase range of the projection brightness becomes larger.
  • the ambient light brightness value can be obtained by a sensor.
  • a sensor There are also many types of sensors mentioned here.
  • an ambient light sensor can be used.
  • the ambient light sensor is mainly composed of a photosensitive element, and the ambient light sensor has a small dark current and a low The illuminance response, the sensitivity is high, and the current varies linearly with the illuminance enhancement. Therefore, the ambient light sensor can sense the ambient light and feed the ambient light signal to the processor.
  • the processor adjusts the projection brightness of the projection device to reduce the power consumption of the product. .
  • the ambient brightness value Normally, when the ambient brightness is high, the brightness of the projection will be adjusted to high brightness after adjustment with the ambient light sensor; when the external environment is dark, the brightness of the projection will be adjusted to low brightness.
  • the present invention does not further define the specific form of the sensor; not only that, the ambient light brightness value can also be obtained by receiving ambient light brightness from other devices than the projector. The way the value is obtained.
  • the projection distance refers to the distance between the projector lens and the projection background, and is generally expressed in meters. In practical applications, for the same projector, the projection distance has a direct relationship with the size of the projected image. Usually we define the ratio of the projection distance to the width of the screen as the projection ratio of the projector (Throw Ratio). Can be expressed as the following relationship:
  • Projection ratio projection distance / screen width
  • the projection ratio of a normal projector is usually between 1.5 and 1.9.
  • the throw ratio is less than 1, we usually call it a short-focus lens; when the throw ratio is below 0.6, we usually call it a short-short lens.
  • the projection ratio of the projector is a hardware parameter of the projector and does not change with changes in the external environment.
  • the projection distance value can be obtained by the distance measuring sensor, and the existing ranging sensors are various, such as: an infrared ranging sensor, a radar ranging sensor, a laser ranging sensor, an ultrasonic ranging sensor, and the like. The invention does not further define the specific components of the ranging sensor.
  • the projection brightness value can be obtained in the following common ways:
  • the first type obtaining the projection brightness value according to the manner of searching the data table for recording the correspondence between the projection brightness value, the ambient light brightness value and the projection distance value according to the ambient light brightness value and the projection distance value obtained in step S100.
  • you want to find the projection brightness value in the data table you must first create a data table, you can follow the steps below to create a data table:
  • the ambient light brightness value and the projection distance value are changed randomly or according to a certain rule, and the projected brightness value which is better subjective effect is obtained by adjusting the projected brightness, and the projected brightness value obtained in this case, the current
  • the ambient light brightness value and the projection distance value form a pair of corresponding relationship.
  • the ambient light brightness value may be used as the first change amount
  • the projected distance value may be used as the second change amount; it is understood that the above change is performed according to a certain rule.
  • the first amount of change can be understood as changing the first change amount according to a certain step size.
  • the step size can be 1 Lux, that is, each environment.
  • the brightness value is increased or decreased by 1 Lux, and the ambient light brightness value after each change can be obtained by the ambient light sensor measurement; after each change of the first change amount, the ambient light brightness value after the change can be continuously adjusted.
  • the projection distance for example, can be adjusted according to a certain step size to change the projection distance, for example, the projection distance from near to far is adjusted in steps of 0.01 m, and the corresponding projection after the adjustment of the projection distance is measured by the distance measuring sensor.
  • the distance value at the same time, each time the projection distance is adjusted, a corresponding projection brightness is obtained, which is the projection brightness value that is best subjectively observed by the tester after adjusting the projection brightness value of the projector multiple times.
  • the range of the ambient light luminance value as the first variation is 0 Lux_AL ⁇ 1000 Lux
  • the projection distance value as the second variation is 0 m ⁇ D ⁇ 5 m
  • the step of the first variation is 1 Lux
  • the step size of the second variation is 0.01 m
  • a plurality of correspondence data about the projection luminance value and the corresponding ambient light luminance value and the corresponding projection distance value are obtained according to the above variation rule ⁇ AL, D, L ⁇ , where AL (Ambient Lux) represents the ambient lightness value, D (Distance) represents the projected distance value, and L (Luminance) represents the projected brightness value, and the obtained correspondence data can be expressed as follows:
  • the preset data table is obtained according to the generated correspondence relationship.
  • the above data sheet can be obtained before the projector starts working.
  • the ambient light value is measured by the ambient light sensor
  • the projection distance value is measured by the distance sensor
  • the measured ambient light is separately measured.
  • the brightness value and the projection distance value are sent to the projector, and the projector searches for the desired projection brightness value according to the received value in the preset data table.
  • the second type obtaining the projected brightness value according to the ambient light brightness value, the projection distance value, and the preset first transform function obtained in step S100, wherein the preset first transform function is: the projected brightness is related to the environment. Brightness and projection The transformation function of the distance.
  • the preset first transformation function needs to be obtained first.
  • the embodiment of the present invention provides a method for obtaining a preset first transformation function, and the flow diagram of the method is shown in FIG. 4 . Shown, the flow chart shown includes the steps:
  • a value may be selected as the projection distance value within the above range, and the projection distance value is determined to keep the value unchanged, and then the ambient light brightness value is adjusted, for example, to make the ambient light brightness.
  • the value varies from 0-1000 Lux.
  • the 0-1000 Lux here is an empirical value, which can be determined according to the actual environment, and is not explicitly defined in this application. The change can be random or regular.
  • the projection distance value is 2.7 m
  • a large number of points determined by the projection luminance value and the ambient light luminance value can be obtained according to the above rule, for example, ⁇ 0, 2 ⁇ , ⁇ 1, 6 ⁇ , ⁇ 2, 10 ⁇ . ,..., ⁇ 999,680 ⁇ , ⁇ 1000,700 ⁇ and so on.
  • These points are discrete in the two-dimensional coordinate system, the horizontal axis of the coordinates represents the ambient light brightness, and the vertical axis represents the projected brightness. It is worth emphasizing that when the ambient light brightness value reaches the maximum, the projected brightness value will also reach the maximum value to ensure a better visual effect of the projected picture.
  • S202 Perform curve fitting on the obtained projection brightness value and the corresponding ambient light brightness value according to a preset first curve fitting algorithm, and obtain a function f(AL) of the projection brightness on the ambient light brightness, wherein AL Indicates the brightness of the ambient light;
  • the curve fitting algorithm is used to fit the curve, and there are many algorithms for curve fitting, and the linear fitting is more commonly used.
  • linear fitting refers to the linear equation of the transformed variable according to the principle of least squares.
  • the linear equation is often used to draw the standard curve of discrete data, and the linear equation can be reduced to a curve as needed. Equations to achieve curve fitting of discrete data.
  • a function f(AL) about the brightness of ambient light.
  • the projection distance value is changed according to a preset projection distance value conversion rule, and a projection corresponding to each changed projection distance value is obtained.
  • the projection machine when the user is using the projector, the projection machine is in a relatively stable environment.
  • the projector is in a conference room, multimedia classroom, living room, etc. for a long time, and the ambient light brightness changes in an environment for a long time. is very Small, after a lot of experiments, the more common ambient light brightness value is around 500Lux.
  • the 500Lux here is the empirical value, which can be determined according to the actual environment. This application does not explicitly limit it.
  • adjust the projection distance value After determining the ambient light brightness value, adjust the projection distance value. If the projection distance of the projector is 5m, the projection distance value can be changed within the range of 0-5m.
  • the change can be random or regular, such as: It can start from 0 and gradually increase in steps of 0.01m until the maximum ambient light level value is reached, and the corresponding projected brightness value after each increase of ambient light brightness is obtained.
  • the projection distance value is 505Lux
  • a large number of points determined by the projection luminance value and the projection distance value can be obtained according to the above rule, ⁇ 0, 2 ⁇ , ⁇ 0.01, 6 ⁇ , ⁇ 0.02, 10 ⁇ , ..., ⁇ 4.99,1000 ⁇ , ⁇ 5,1100 ⁇ .
  • These points are discrete in two-dimensional coordinates, the horizontal axis of the coordinates represents the projection distance, and the vertical axis represents the projected brightness. It is worth emphasizing that when the projection distance value reaches the maximum, the projection brightness value will also reach the maximum value to ensure a better visual effect of the projected picture.
  • S204 Perform curve fitting on the obtained projection brightness value and the corresponding projection distance value according to a preset second curve fitting algorithm, and obtain a function g(D) of the projection brightness with respect to the projection distance, where D represents a projection. distance;
  • the curve fitting algorithm is used to fit the curve, and the curve fitting algorithm has many, according to the distribution of the specific discrete points, Choose a more common nonlinear model for fitting.
  • Obtaining the preset first transformation function according to the function f(AL) and the function g(D) may have multiple relationships, and may be obtained by substituting, adding, multiplying, and squared the two functions; The two functions are multiplied to obtain a preset first transformation function, that is, the function f(AL) of the projection luminance obtained in S202 with respect to the ambient light luminance and the projection luminance obtained in S204 with respect to the projection distance function g(D) Multiply, to get the preset first transformation function L(AL, D),
  • the preset first transformation function L(AL, D) can be obtained before the projector starts working.
  • the ambient light luminance value is measured by the ambient light sensor
  • the projection distance value is measured by the distance sensor. And respectively transmitting the measured ambient light brightness value and the projection distance value to the projector, and the projector substitutes the received value into the preset first transformation function L(AL, D) to obtain the desired projection brightness. value.
  • the third type obtaining picture information of the image to be projected, and obtaining a projection brightness value according to the picture information, the ambient light brightness value, the projection distance value, and a preset second transformation function, the preset
  • the second transformation function is: a transformation function of the projection brightness with respect to ambient lightness and projection distance.
  • the wavelengths shown in Table 1 above are from short to long, and the corresponding color change is purple to red. This indicates that the perception of color by the human eye can be understood as different perception of the optical signal, so that the best projection brightness is desired.
  • the color histogram statistical value of the image to be projected can be obtained by performing image analysis and processing on the image to be projected, and then determining the projection brightness according to the obtained statistical value.
  • the process of obtaining the statistical value of the color histogram of the image to be projected may be implemented by a processor included in the projector; or the image to be projected and analyzed by the image analysis and processing software may be analyzed and processed before the image to be projected is connected with the projector, and obtained
  • the color histogram statistical value of the projected image is obtained, and the obtained color histogram statistical value of the image to be projected is saved together with the corresponding image to be projected, so that the projector directly obtains the color histogram of the image to be projected after the image to be projected is connected to the projector.
  • Statistics The embodiment of the present invention does not further define the specific form of obtaining the color histogram statistics.
  • the color histogram of the image can reflect the composition distribution of the image color, that is, the probability of occurrence of various colors, and the brightness distribution of the projected image can be obtained intuitively by the obtained color histogram statistical value, usually, the human eye There is a certain error between the obtained image picture brightness value and the actual picture brightness value.
  • K may take a value less than 1, as shown in FIG. 7, an example of a color histogram when K ⁇ 1. .
  • K the value can be set to 1;
  • K may take a value less than 1 or the like.
  • f(AL) aAL + b.
  • the above adjustment function can be obtained before the projector starts working.
  • the ambient light value is measured by the ambient light sensor
  • the projection distance value is measured by the distance sensor
  • the measured ambient light brightness value is respectively measured.
  • the projection distance value is sent to the projector, and the projector substitutes the received value into the adjustment function to obtain the desired projection brightness value.
  • the image picture complexity can also be considered.
  • the picture is simple, for example, the picture content only includes a few single lines, even if the projection brightness is low, the user can clearly see the projected picture, and if the picture is complicated, for example, the picture The content contains graphics with complex textures, etc. If the projection brightness is low, the user cannot clearly see the projected image.
  • the complexity of the image may be obtained by using an existing image analysis algorithm, and then the adjustment coefficient is determined according to the image complexity. For example, the image complexity is greater than a preset threshold. When the adjustment coefficient takes a larger value, and the image complexity is not greater than the preset threshold, the adjustment coefficient takes a smaller value, and the specific data can be determined according to the specific situation.
  • the projection brightness is adjusted by adjusting the parameters of the projector. Specifically, the adjustment of the projection brightness of the projector can be realized by changing the input current or voltage of the projector.
  • the ambient light brightness value and the projection distance value are first obtained; and then the projected brightness value is obtained according to the obtained ambient light brightness value and the projected distance value; and the projected brightness value obtained by the last root is obtained. Adjust the projection brightness.
  • the projection brightness can be adjusted according to the ambient light brightness and the projection distance, and therefore, a projected image with better subjective quality can be obtained.
  • FIG. 8 is a schematic structural diagram of a projection brightness adjusting apparatus according to an embodiment of the present disclosure, which corresponds to the method flowchart of FIG.
  • the parameter value obtaining module 100 is configured to obtain an ambient light brightness value and obtain a projected distance value.
  • the projection brightness value obtaining module 200 is configured to obtain a projected brightness value according to the ambient light brightness value and the projected distance value.
  • the projection luminance value obtaining module 100 can be expressed as the following structures:
  • the projection brightness adjusting device here should have a data table obtaining module, wherein the data table obtaining module should also include a projection for obtaining different ambient light brightness values and different projection distance values according to preset test rules.
  • a first projection brightness value of the brightness value obtains a sub-module; and is configured to generate a correspondence relationship between the set relationship of the obtained projection brightness according to the obtained projection brightness and the corresponding ambient light brightness and the corresponding projection distance thereof a submodule; configured to obtain a data table obtaining submodule of the preset data table according to the generated correspondence.
  • the ambient light luminance value and the projection distance value obtained in the module 100 in a data table for recording a correspondence relationship between the projection luminance value, the ambient light luminance value, and the projection distance value obtained by the data table obtaining module. Find and get the projected brightness value.
  • the projection brightness adjustment device is required to have a transformation function obtaining module, as shown in FIG. 9, wherein the transformation function obtaining module should further include:
  • the second projection brightness value obtaining sub-module 201 is configured to change the ambient light brightness value according to a preset ambient light brightness conversion rule if the projection distance value is a preset projection distance value, and obtain each change The projected brightness value corresponding to the ambient light brightness value.
  • the first function obtaining sub-module 202 is configured to perform curve fitting on the obtained projection brightness value and the corresponding ambient light brightness value according to a preset first curve fitting algorithm, and obtain a function of the projection brightness on the ambient light brightness. f(AL), where AL indicates the ambient light level.
  • the third projection brightness value obtaining sub-module 203 is configured to change the projection distance value according to a preset projection distance value conversion rule to obtain each change if the ambient light brightness value is a preset ambient light brightness value.
  • the projected brightness value corresponding to the subsequent projection distance value is configured to change the projection distance value according to a preset projection distance value conversion rule to obtain each change if the ambient light brightness value is a preset ambient light brightness value.
  • the second function obtaining sub-module 204 is configured to perform curve fitting on the obtained projection brightness value and the corresponding projection distance value according to a preset second curve fitting algorithm to obtain a function g of the projection brightness with respect to the projection distance ( D), where D represents the projection distance.
  • the transform function obtaining submodule 205 is configured to obtain the preset first transform function according to the function f(AL) and the function g(D).
  • the projection brightness value obtaining module 100 includes:
  • an image information obtaining sub-module configured to obtain a color histogram statistical value of the image to be projected and/or an image picture complexity of the image to be projected
  • An adjustment coefficient determining submodule configured to determine an adjustment coefficient according to the color histogram statistical value and/or the image picture complexity
  • a fourth projection brightness value obtaining submodule configured to obtain a projection brightness value according to the adjustment coefficient, the ambient light brightness value, the projection distance value, and a preset second transformation function.
  • the projection brightness value adjustment module 300 is configured to adjust the projection brightness according to the projection brightness value.
  • the embodiment of the present invention first obtaining an ambient light brightness value and a projection distance value; and further obtaining a projected brightness value according to the obtained ambient light brightness value and the projected distance value; and finally obtaining the projected brightness value adjusted projection brightness.
  • the projection brightness can be adjusted according to the ambient light brightness and the projection distance, and therefore, a projected image with better subjective quality can be obtained.

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Abstract

本发明实施例公开了一种投影亮度调节方法及装置，所述方法包括：先获得环境光亮度值以及投影距离值；再根据获得的环境光亮度值和投影距离值，获得投影亮度值；最后根据所获得的所述投影亮度值调节投影亮度。应用本发明实施例能根据环境光亮度和投影距离对投影亮度进行调节，能获得具有较佳主观质量的投影图像。

Description

一种投影亮度调节方法及装置
本申请要求了申请日为2015年12月31日，申请号为201511032414.3，发明名称为“一种投影亮度调节方法及装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本发明涉及投影技术领域，特别涉及一种投影亮度调节方法及装置。
背景技术
近年来，随着电子技术和电子产品的日益更新，投影机因其便携、灵活、寿命长等优点，已成为现代多媒体会议室、多媒体教室、电影院、家庭影院中不可缺少的图像输出设备，它能按照一定比例对图像进行放大或者缩小处理，以使得人们看到合适大小的图像，这是普通电视所无法实现的，另外，投影机可以把传统的视频信号、电脑的VGA信号等通过转接口转换后投射到投影背景上。
由于在投影背景上投影图像时，投影图像的主观质量受投影亮度、原始投影图像的图像亮度等多种因素的影响，因此，为了使得投影图像具有较佳的主观质量、给用户带来较佳的用户体验，需在投影过程中根据当前的投影环境因素调节投影亮度。
发明内容
本发明实施例公开了一种投影亮度调节方法及装置，以调节投影亮度，获得具有较佳主观质量的投影图像。
技术方案如下：
本发明实施例公开了一种投影亮度调节方法，所述方法包括：
获得环境光亮度值以及投影距离值；
根据所述环境光亮度值和所述投影距离值，获得投影亮度值；
根据所述投影亮度值调节投影亮度。
在本申请的一种具体实现方式中，所述根据所述环境光亮度值和所述投影距离值，获得投影亮度值，包括：
根据所述环境光亮度值和所述投影距离值在预设数据表中查找，获得投影亮度值，其中，所述预设数据表为：用于记录投影亮度值、环境光亮度值和投影距离值三者之间对应关系的数据表；
或，根据所述环境光亮度值、所述投影距离值以及预设的第一变换函数，获得投影亮度值，其中，所述预设的第一变换函数为：投影亮度关于环境光亮度和投影距离的变换函数；
或，获得待投影图像的画面信息，根据所述画面信息、所述环境光亮度值、所述投影距离值以及预设的第二变换函数，获得投影亮度值，所述预设的第二变换函数为：投影亮度关于环境光亮度和投影距离的变换函数。
在本申请的一种具体实现方式中，所述预设数据表通过如下方式获得：
按照预设的测试规则，获得不同环境光亮度值以及不同投影距离值情况下的投影亮度值；
根据所获得的投影亮度值以及其对应的环境光亮度值、其对应的投影距离值，生成一组针对所获得的投影亮度的对应关系；
根据所生成的对应关系，获得所述预设数据表。
在本申请的一种具体实现方式中，所述预设的第一变换函数通过如下步骤获得：
在所述投影距离值为预设投影距离值的情况下，按照预设的环境光亮度变换规则改变所述环境光亮度值，获得每一个改变后的所述环境光亮度值对应的投影亮度值；
按照预设的第一曲线拟合算法，对所获得的投影亮度值及其对应的环境光亮度值进行曲线拟合，获得投影亮度关于环境光亮度的函数f(AL)，其中，AL表示环境光亮度；
在所述环境光亮度值为预设环境光亮度值的情况下，按照预设的投影距离值变换规则改变所述投影距离值，获得每一个改变后的所述投影距离值对应的投影亮度值；
按照预设的第二曲线拟合算法，对所获得的投影亮度值及其对应的投影距离值进行曲线拟合，获得投影亮度关于投影距离的函数g(D)，其中，D表示投影距离；
根据所述函数f(AL)和所述函数g(D)，获得所述预设的第一变换函数。
在本申请的一种具体实现方式中，所述根据所述函数f(AL)和所述函数g(D)，获得所述预设的变换函数，包括：
根据以下表达式，获得所述预设的第一变换函数L(AL,D)，
L(AL,D)＝f(AL)*g(D)。
在本申请的一种具体实现方式中，所述获得待投影图像的画面信息，根据所述画面信息、所述环境光亮度值、所述投影距离值以及预设的第二变换函数，获得投影亮度值，包括：
获得待投影图像的颜色直方图统计值和/或所述待投影图像的图像画面复杂度；
根据所述颜色直方图统计值和/或所述图像画面复杂度，确定调整系数；
根据所述调整系数、所述环境光亮度值、所述投影距离值以及预设的第二变换函数，获得投影亮度值。
本发明实施例公开了一种投影亮度调节装置，所述装置包括：
参数值获得模块，用于获得环境光亮度值以及获得投影距离值；
投影亮度值获得模块，用于根据所述环境光亮度值和所述投影距离值，获得投影亮度值；
投影亮度调节模块，用于根据所述投影亮度值调节投影亮度。
在本申请的一种具体实现方式中，所述投影亮度值获得模块，具体用于：
根据所述环境光亮度值和所述投影距离值在预设数据表中查找，获得投影亮度值，其中，所述预设数据表为：用于记录投影亮度值、环境光亮度值和投影距离值三者之间对应关系的数据表；
或，根据所述环境光亮度值、所述投影距离值以及预设的第一变换函数，获得投影亮度值，其中，所述预设的第一变换函数为：投影亮度关于环境光亮度和投影距离的变换函数；
或，获得待投影图像的画面信息，根据所述画面信息、所述环境光亮度值、所述投影距离值以及预设的第二变换函数，获得投影亮度值，所述预设的第二变换函数为：投影亮度关于环境光亮度和投影距离的变换函数。
在本申请的一种具体实现方式中，所述投影亮度调节装置还包括：
数据表获得模块，用于获得所述预设数据表；
其中，所述数据表获得模块，包括：
第一投影亮度值获得子模块，用于按照预设的测试规则，获得不同环境光亮度值以及不同投影距离值情况下的投影亮度值；
对应关系生成子模块，用于根据所获得的投影亮度以及其对应的环境光亮度、其对应的投影距离，生成一组针对所获得的投影亮度的对应关系；
数据表获得子模块，用于根据所生成的对应关系，获得所述预设数据表。
在本申请的一种具体实现方式中，所述投影亮度调节装置还包括：
变换函数获得模块，用于获得所述预设的第一变换函数；
其中，所述变换函数获得模块，包括：
第二投影亮度值获得子模块，用于在所述投影距离值为预设投影距离值的情况下，按照预设的环境光亮度变换规则改变所述环境光亮度值，获得每一个改变后的所述环境光亮度值对应的投影亮度值；
第一函数获得子模块，用于按照预设的第一曲线拟合算法，对所获得的投影亮度值及其对应的环境光亮度值进行曲线拟合，获得投影亮度关于环境光亮度的函数f(AL)，其中，AL表示环境光亮度；
第三投影亮度值获得子模块，用于在所述环境光亮度值为预设环境光亮度值的情况下，按照预设的投影距离值变换规则改变所述投影距离值，获得每一个改变后的所述投影距离值 对应的投影亮度值；
第二函数获得子模块，用于按照预设的第二曲线拟合算法，对所获得的投影亮度值及其对应的投影距离值进行曲线拟合，获得投影亮度关于投影距离的函数g(D)，其中，D表示投影距离；
变换函数获得子模块，用于根据所述函数f(AL)和所述函数g(D)，获得所述预设的第一变换函数。
在本申请的一种具体实现方式中，所述变换函数获得子模块，具体用于根据以下表达式，获得所述预设的第一变换函数L(AL,D)，
L(AL,D)＝f(AL)*g(D)。
在本申请的一种具体实现方式中，所述投影亮度值获得模块，包括：
图像信息获得子模块，用于获得待投影图像的颜色直方图统计值和/或所述待投影图像的图像画面复杂度；
调整系数确定子模块，用于根据所述颜色直方图统计值和/或所述图像画面复杂度，确定调整系数；
第四投影亮度值获得子模块，用于根据所述调整系数、所述环境光亮度值、所述投影距离值以及预设的第二变换函数，获得投影亮度值。
本发明实施例提供了一种投影亮度调节方法及装置，先获得环境光亮度值以及投影距离值；再根据获得的环境光亮度值和所述投影距离值，获得投影亮度值；最后根获得的述投影亮度值调节投影亮度。可见，应用本发明实施例能根据环境光亮度和投影距离对投影亮度进行调节，因此，能获得具有较佳主观质量的投影图像。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为本发明实施例提供的一种投影亮度调节方法的流程示意图。
图2为本发明实施例提供的投影亮度和环境光亮度之间的关系变化图。
图3为本发明实施例提供的投影亮度和投影距离之间的关系变化图。
图4为本发明实施例提供的一种获得预设的第一变换函数方法的流程示意图。
图5为本发明实施例提供的人眼接收光信号的灵敏度曲线。
图6为本发明实施例提供的一个投影图像的颜色直方图示例。
图7为本发明实施例提供的另一个投影图像的颜色直方图示例。
图8为本发明实施例提供的一种投影亮度调节装置的结构示意图。
图9为本发明实施例提供的一种变换函数获得模块的结构示意图。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
本发明实施例提供了一种投影亮度调节方法及装置，先获得环境光亮度值以及投影距离值；再根据获得的环境光亮度值和所述投影距离值，获得投影亮度值；最后根获得的述投影亮度值调节投影亮度。可见，应用本发明实施例能根据环境光亮度和投影距离对投影亮度进行调节，因此，能获得具有较佳主观质量的投影图像。
下面通过具体实施例，对本发明进行详细说明。
图1为本发明实施例提供的一种投影亮度调节方法的流程示意图，包括如下步骤：
S100：获得环境光亮度值以及投影距离值。
本技术领域技术人员可以理解的是，投影机的投影亮度受环境光亮度以及投影距离影响，在不同的环境光下以及不同的投影距离下，投影机需要以不同的投影亮进行投影，以得到较佳的投影效果。
申请人经过大量实验，分析得到投影亮度与环境光亮度之间存在一定的变化关系，投影亮度与投影距离之间也存在一定的变化关系。
具体的，如图2所示，提供了一种投影亮度和环境光亮度之间的关系变化图，从图中可直观的发现，投影亮度值随着环境光亮度值的增加而增加；再如图3所示，提供了一种投影亮度和投影距离之间的关系变化图，从图中可见投影亮度值也是随着投影距离值的增加而增加的。
值得一提的是，虽然投影亮度随着环境光亮度的增加而增加，也随着投影距离的增加而增加，但是增加幅度是存在区别的，具体的，从图2和图3中明显可以看出，随着环境光亮度增加，投影亮度增加幅度变小，随着投影距离增加，投影亮度增加幅度变大。
具体的，环境光亮度值可以通过传感器获得，这里所说的传感器也有很多种，例如，可以采用环境光传感器，环境光传感器主要由光敏元件组成，环境光传感器具有暗电流小，低 照度响应，灵敏度高，电流随光照度增强呈线性变化等特性，所以环境光传感器可以感知周围光线情况，并将环境光信号反馈给处理器，处理器调节投影设备的投影亮度，降低产品的功耗。通常情况下，当环境亮度较高时，使用环境光传感器进行调节后，投影亮度就会调成高亮度；当外界环境较暗时，投影亮度就会调成低亮度。当然这里的对环境光亮度值的获得方式还有很多种，本发明并不对传感器的具体形式做进一步限定；不仅如此，环境光亮度值还可以通过接收投影机以外的其他设备采集的环境光亮度值的方式获得。
需要说明的是，本申请只是以上述为例进行说明，实际应用中并不限定环境光亮度值的获得方式。
可知的是，投影距离是指投影机镜头与投影背景之间的距离，一般用米来作为单位。在实际的应用当中，针对同一台投影机来说，投影距离和投影画面的大小有着直接的关系，通常我们将投影距离与画面宽度的比定义为投影机的投射比(Throw Ratio)，投射比可表示为如下关系式：
投射比＝投影距离/画面宽度
投射比越小，说明相同投影距离，投射画面的宽度越大。普通投影机的投射比，通常在1.5-1.9之间。当投射比小于1时，我们通常称之为短焦镜头；而当投射比达到0.6以下，我们通常称之为超短焦镜头。不难理解的是，投影机的投射比是投影机的硬件参数，不会随着外界环境的变化而发生变化。本发明实施例中，投影距离值可以通过测距传感器测量获得，现有的测距传感器有很多种，比如：红外线测距传感器、雷达测距传感器、激光测距传感器、超声波测距传感器等，本发明并不对测距传感器的具体元件做进一步限定。
S200：根据所述环境光亮度值和所述投影距离值，获得投影亮度值。
实际应用中，投影亮度值可通过如下几种常见的方式获得：
第1种：根据步骤S100中获得的环境光亮度值和投影距离值在用于记录投影亮度值、环境光亮度值和投影距离值三者之间对应关系的数据表查找的方式获得投影亮度值；这里，如果想在数据表中查找到投影亮度值的话，就必须先建立数据表，可以依照下述步骤建立数据表：
实际测量时，随机的或者按照一定的规则改变环境光亮度值以及投影距离值，通过调整投影亮度的方式获得主观效果较佳的投影亮度值，将这种情况下获得的投影亮度值、当前的环境光亮度值以及投影距离值形成一对对应关系，具体的，可以将环境光亮度值作为第一变化量，将投影距离值作为第二变化量；可以理解的是，按照一定的规则改变上述第一变化量，可以理解为按照一定的步长改变上述第一变化量，例如，该步长可以为1Lux，即每次环境 光亮度值增加或减少1Lux，每次变化后的环境光亮度值可通过环境光传感器测量获得；每改变一次第一变化量后，在该变化后的环境光亮度值下，还可以不断的调节投影距离，例如，可以按照一定的步长进行调节改变投影距离，如以0.01m的步长进行由近至远的调节投影距离，并通过测距传感器测得该次调节投影距离后对应的投影距离值，同时，在每一次调节投影距离时都获得一个对应的投影亮度，该投影亮度是经过多次调节投影机投影亮度值后测试人员所观测的主观效果最佳的投影亮度值。
根据以上步骤中获得的投影亮度值以及其对应的环境光亮度值、其对应的投影距离值，生成一组针对所获得的投影亮度的对应关系；
例如：作为第一变化量的环境光亮度值的范围是0Lux≤AL≤1000Lux，作为第二变化量的投影距离值的范围为0m≤D≤5m，取第一变化量的步长为1Lux，取第二变化量的步长为0.01m，按照上述的变化规则可获得大量的关于投影亮度值以及其对应的环境光亮度值、其对应的投影距离值的对应关系数据{AL,D,L}，其中，AL(Ambient Lux)表示环境光亮度值，D(Distance)表示投影距离值，L(Luminance)表示投影亮度值，获得的对应关系数据可以表示如下：
{0,0,0}，{0,0.01,0.5}，{0,0.02,0.6}，{0,0.03,0.8}，
{0,0.04,1.1}，…，{0,4.99,78}，{0,5,80}；
{1,0,0}，{1,0.01,0.6}，{1,0.02,0.8}，{1,0.03,1.1}，
{1,0.04,1.4}，…，{1,4.99,116}，{1,5,220}；
…
{999,0,0}，{999,0.01,3}，{999,0.02,5}，{999,0.03,8}，
{999,0.04,15}，…，{999,0.05,1050}，{999,5,1100}；
{1000,0,0}，{1000,0.01,3.5}，{1000,0.02,6}，{1000,0.03,10}，
{1000,0.04,17}，…，{1000,4.99,1060}，{1000,5,1120}；
根据所生成的上述对应关系，获得所述预设数据表。
上述的数据表可以在投影机开始工作之前就已经获得的，在实际使用时，通过环境光传感器测得环境光亮度值，通过距离传感器测得投影距离值，并分别将所测得的环境光亮度值以及投影距离值发送给投影机，投影机根据接收到的数值在上述预设数据表中查找，获得所需的投影亮度值。
第2种：根据步骤S100中所获得的环境光亮度值、投影距离值以及预设的第一变换函数，获得投影亮度值，其中，所述预设的第一变换函数为：投影亮度关于环境光亮度和投影 距离的变换函数。
采用第2种方法获得投影亮度值的时候，需要先获得预设的第一变换函数，本发明实施例提供了一种获得预设的第一变换函数方法，该方法的流程示意图如图4所示，所示流程图包括步骤：
S201：在所述投影距离值为预设投影距离值的情况下，按照预设的环境光亮度变换规则改变所述环境光亮度值，获得每一个改变后的所述环境光亮度值对应的投影亮度值；
通常情况下，用户在使用投影机的时候，都会在一定的距离段内投影，经过大量的实验发现，当投影距离控制在2-3m时，投影效果较佳。在本发明的一种较佳实现方式中，可在上述范围内选取一个数值作为投影距离值，确定好投影距离值后保持该值不变，再调节环境光亮度值，例如，使环境光亮度值从0-1000Lux变化，当然，这里的0-1000Lux是经验值，可根据实际环境确定，本申请不对其做明确限定。变化可以是随机的也可以是有规则的变化，如：可以从0开始，以1Lux的步长逐渐增加，直到达到最大环境光亮度值，并获得每一次增加环境光亮度后对应的投影亮度值。例如，选取投影距离值为2.7m，按照上述规则可获得大量的由投影亮度值和环境光亮度值所确定的点，例如，{0,2}，{1,6}，{2,10}，…，{999,680}，{1000,700}等等。这些点在二维坐标系里是离散的，坐标的横轴代表环境光亮度，纵轴代表投影亮度。值得强调的是，当环境光亮度值达到最大时，投影亮度值也将达到最大值，以保证投影画面具有较佳的视觉效果。
S202：按照预设的第一曲线拟合算法，对所获得的投影亮度值及其对应的环境光亮度值进行曲线拟合，获得投影亮度关于环境光亮度的函数f(AL)，其中，AL表示环境光亮度；
根据步骤S201获得的大量的由投影亮度值和环境光亮度值所确定的离散点，按照曲线拟合的算法对其进行拟合，曲线拟合的算法有很多，较常用的有线性拟合等等，其中，线性拟合是指按最小二乘法原理求出变换后变量的直线方程，在实际工作中常利用此直线方程绘制离散数据的标准变化曲线，同时根据需要可将此直线方程还原为曲线方程，实现对离散数据的曲线拟合。例如：本实施例中，投影亮度关于环境光亮度的变化关系可以表示为f(AL)＝a*AL+b，通过线性拟合的方法可获得式中的a、b值，从而获得投影亮度关于环境光亮度的函数f(AL)。
S203：在所述环境光亮度值为预设环境光亮度值的情况下，按照预设的投影距离值变换规则改变所述投影距离值，获得每一个改变后的所述投影距离值对应的投影亮度值；
同样的，用户在使用投影机的时候，投影机会处于一个比较稳定的环境中，如，投影机长时间处于会议室、多媒体教室、客厅等，长时间处于一种环境下其环境光亮度的变化是很 小的，经过大量的实验发现，较常见的环境光亮度值在500Lux左右，当然，这里的500Lux是经验值，可根据实际环境确定，本申请不对其做明确限定。确定环境光亮度值后，调节投影距离值，假设投影机的投影距离为5m，则，投影距离值可在0-5m范围内变化，变化可以是随机的也可以是有规则的变化，如：可以从0开始，以0.01m的步长逐渐增加，直到达到最大环境光亮度值，并获得每一次增加环境光亮度后对应的投影亮度值。例如，选取投影距离值为505Lux，按照上述规则可获得大量的由投影亮度值和投影距离值所确定的点，{0,2}，{0.01,6}，{0.02,10}，…，{4.99,1000}，{5,1100}。这些点在二维坐标里是离散的，坐标的横轴代表投影距离，纵轴代表投影亮度。值得强调的是，当投影距离值达到最大时，投影亮度值也将达到最大值，以保证投影画面具有较佳的视觉效果。
S204：按照预设的第二曲线拟合算法，对所获得的投影亮度值及其对应的投影距离值进行曲线拟合，获得投影亮度关于投影距离的函数g(D)，其中，D表示投影距离；
根据步骤S203获得的大量的由投影亮度值和投影距离值所确定的离散点，按照曲线拟合的算法对其进行拟合，曲线拟合的算法有很多，根据具体的离散点的分布情况，选择较常用的非线性模型进行拟合。例如：本实施例中，投影亮度关于投影距离的变化关系可以表示为g(D)＝(c*D2)，通过非线性模型进行拟合，获得投影亮度关于投影距离的函数g(D)。
S205：根据所述函数f(AL)和所述函数g(D)，获得所述预设的第一变换函数。
根据函数f(AL)和函数g(D)获得所述预设的第一变换函数，可以有多种关系，可以对两函数代换、相加、相乘、平方后获得；常见的是对两函数相乘，获得预设的第一变换函数，即，将S202中获得的投影亮度关于环境光亮度的函数f(AL)与S204中获得的投影亮度关于投影距离的函数g(D)相乘，得到预设的第一变换函数L(AL,D)，
L(AL,D)＝f(AL)*g(D)。
上述的预设的第一变换函数L(AL,D)可以在投影机开始工作之前就已经获得，在实际使用时，通过环境光传感器测得环境光亮度值，通过距离传感器测得投影距离值，并分别将所测得的环境光亮度值以及投影距离值发送给投影机，投影机根据接收到的数值代入预设的第一变换函数L(AL,D)中，获得所需的投影亮度值。
第3种：获得待投影图像的画面信息，根据所述画面信息、所述环境光亮度值、所述投影距离值以及预设的第二变换函数，获得投影亮度值，所述预设的第二变换函数为：投影亮度关于环境光亮度和投影距离的变换函数。
本领域技术人员可以理解的是，投影机所投影的投影画面颜色不同时，人眼能感觉到的投影画面的亮度也不同，这是因为人眼对色彩的感知不同，人眼对于不同波长的光线，接收 到的信号强度差别会很大，如图5所示，例如，同样是1W的辐射光，波长为555nm时，人眼能接收到683mW，而波长400nm时，人眼仅能接收到0.27mW，同时光线的波长与RGB颜色值有着密切的对应关系，其对应关系可参见表1：
表1：
Figure PCTCN2016111252-appb-000001
上述表1中所示的波长由短到长，对应的色彩变化为紫色达红色，这表明，人眼对颜色的感知不同可以理解为对光信号的感知不同，所以想获得最佳的投影亮度可以通过对待投影图像进行图像分析、处理，获得待投影图像的颜色直方图统计值，然后根据所获得的统计值确定投影亮度。该获得待投影图像的颜色直方图统计值的过程可由投影机内含的处理器实现；也可在待投影图像与投影机连接前通过图像分析、处理软件对待投影图像进行分析、处理，获得待投影图像的颜色直方图统计值，并将获得的待投影图像的颜色直方图统计值与对应的待投影图像一块保存，以便待投影图像连接投影机后投影机直接获取待投影图像的颜色直方图统计值。本发明实施例并不对颜色直方图统计值具体的获得形式做进一步限定。
可知的是，图像的颜色直方图能够反映图像颜色的组成分布，即各种颜色出现的概率，通过获得的颜色直方图统计值可以直观的得到投影图像的画面亮度分布，通常情况下，人眼获取的图像画面亮度值与实际画面亮度值之间存在着一定的误差，我们可以将人眼获取的画面亮度值与实际画面亮度值的接近程度用一个调整系数K来表示，在本发明的一种可选实现方式中，
在图像颜色直方图中有80％以上颜色对应波长λ＞600nm或者λ＜495nm时，K的取值可以设置为1，如图6所示，为K＝1时的一种颜色直方图的示例；
在图像颜色直方图中有80％以上颜色对应波长λ落在495nm-600nm范围内时，K可以取小于1的值，如图7所示，为K<1时的一种颜色直方图的示例。
需要说明的是，本申请只是以此为例进行说明，实际应用中，上述波长的取值范围可以根据实际情况确定。
例如，图像颜色直方图中有80％以上颜色对应波长λ＞600nm或者λ＜500nm时，K 的取值可以设置为1；
在图像颜色直方图中有80％以上颜色对应波长λ落在500nm-600nm范围内时，K可以取小于1的值等等。
关于具体的K值，可根据不同的图像内容，进行大量的测试，得到经验的数值。
由大量的实验可以得到人眼获取投影图像的画面亮度关于投影亮度以及投影距离的函数B＝L/(c*d2)，其中B(Brightness)为投影图像的画面亮度，d为投影距离，c为常量。大量的实验可以得到c常量的一个平均值。进而可得到人眼获取投影图像的画面亮度关于投影亮度和投影距离的函数B＝g(L,d)。
另外，在不同环境光亮度下，获得环境光亮度值以及当前条件下人眼获取投影图像的画面亮度值，通过线性拟合的方法获得人眼获取投影图像的画面亮度关于环境光亮度的函数B＝f(AL)，由前面的描述可知，一种可选的实现方式中，f(AL)＝aAL+b。
通过采集数据进行曲线拟合，可以得到常量a、b的值，进而得到具体的函数f(AL)。
对上述得到的两个函数进行代换，可得到投影亮度关于投影距离和环境光亮度的函数L＝c*d2*(a*AL+b)。
再根据所求的调整系数与可得到投影亮度关于投影距离和环境光亮度的函数相乘，得到调整函数L＝K*c*d2*(a*AL+b)。
上述调整函数可以在投影机开始工作之前就已经获得，在实际使用时，通过环境光传感器测得环境光亮度值，通过距离传感器测得投影距离值，并分别将所测得的环境光亮度值以及投影距离值发送给投影机，投影机根据接收到的数值代入调整函数中，获得所需的投影亮度值。
另外，获得投影亮度值时，还可以考虑图像画面复杂度。本领域内的技术人员可以理解的是，画面简单的话，例如，画面内容仅仅包含几条单一的线条，即使投影亮度低，用户依然能够清楚的看到投影画面，相反画面复杂的话，例如，画面内容包含纹理复杂的树叶等等图形，若投影亮度低，用户则无法清楚的看到投影画面。
具体的，利用图像的画面复杂度获得投影亮度值时，可以先通过现有的图像分析算法，获得图像的复杂度，然后根据图像复杂度确定调整系数，例如，图像复杂度大于预设的阈值时，调整系数取较大的数值，而图像复杂度不大于预设的阈值时，调整系数取较小的数值，具体数据可以根据具体情况确定。
另外，用于计算图像复杂度的图像分析算法现有技术中比较常见，这里不再一一叙述。
以上3种获得投影亮度值的方法只是本发明实施例的几种具体的举例，本申请并不对获 取投影亮度值的方法做进一步限定。
S300：根据所述投影亮度值调节投影亮度。
投影机得到S200中所获得的投影亮度值后，通过调节投影机的参数来实现投影亮度的调节。具体的，可以通过改变投影机的输入电流或电压的方式来实现对投影机投影亮度的调节。
可见，应用本发明实施例提供的方案，先获得环境光亮度值以及投影距离值；再根据获得的环境光亮度值和所述投影距离值，获得投影亮度值；最后根获得的述投影亮度值调节投影亮度。能根据环境光亮度和投影距离对投影亮度进行调节，因此，能获得具有较佳主观质量的投影图像。
图8为本发明实施例提供的一种投影亮度调节装置的结构示意图，与图1方法流程图对应，包括：
参数值获得模块100：用于获得环境光亮度值以及获得投影距离值。
投影亮度值获得模块200：用于根据所述环境光亮度值和所述投影距离值，获得投影亮度值。
实际应用中，投影亮度值获得模块100可以表示为以下几种结构：
A结构：这里的投影亮度调节装置应该具有数据表获得模块，其中，数据表获得模块还应该包括，用于按照预设的测试规则，获得不同环境光亮度值以及不同投影距离值情况下的投影亮度值的第一投影亮度值获得子模块；用于根据所获得的投影亮度以及其对应的环境光亮度、其对应的投影距离，生成一组针对所获得的投影亮度的对应关系的对应关系生成子模块；用于根据所生成的对应关系，获得所述预设数据表的数据表获得子模块。
根据参数值获得模块100中获得的环境光亮度值和投影距离值在用于记录投影亮度值、环境光亮度值和数据表获得模块所获得的投影距离值三者之间对应关系的数据表中查找，得到投影亮度值。
B结构：这里要求投影亮度调节装置具有变换函数获得模块，如图9所示，其中，变换函数获得模块还应该包括：
第二投影亮度值获得子模块201，用于在所述投影距离值为预设投影距离值的情况下，按照预设的环境光亮度变换规则改变所述环境光亮度值，获得每一个改变后的所述环境光亮度值对应的投影亮度值。
第一函数获得子模块202，用于按照预设的第一曲线拟合算法，对所获得的投影亮度值及其对应的环境光亮度值进行曲线拟合，获得投影亮度关于环境光亮度的函数f(AL)，其中， AL表示环境光亮度。
第三投影亮度值获得子模块203，用于在所述环境光亮度值为预设环境光亮度值的情况下，按照预设的投影距离值变换规则改变所述投影距离值，获得每一个改变后的所述投影距离值对应的投影亮度值。
第二函数获得子模块204，用于按照预设的第二曲线拟合算法，对所获得的投影亮度值及其对应的投影距离值进行曲线拟合，获得投影亮度关于投影距离的函数g(D)，其中，D表示投影距离。
变换函数获得子模块205，用于根据所述函数f(AL)和所述函数g(D)，获得所述预设的第一变换函数。
根据所述环境光亮度值、所述投影距离值以及投影亮度关于环境光亮度和投影距离的变换函数获得模块所获得的变换函数，获得投影亮度值。
C结构：投影亮度值获得模块100包括：
图像信息获得子模块，用于获得待投影图像的颜色直方图统计值和/或所述待投影图像的图像画面复杂度；
调整系数确定子模块，用于根据所述颜色直方图统计值和/或所述图像画面复杂度，确定调整系数；
第四投影亮度值获得子模块，用于根据所述调整系数、所述环境光亮度值、所述投影距离值以及预设的第二变换函数，获得投影亮度值。
投影亮度值调节模块300：用于根据所述投影亮度值调节投影亮度。
应用本发明实施例提供的方案，先获得环境光亮度值以及投影距离值；再根据获得的环境光亮度值和所述投影距离值，获得投影亮度值；最后根获得的述投影亮度值调节投影亮度。能根据环境光亮度和投影距离对投影亮度进行调节，因此，能获得具有较佳主观质量的投影图像。
对于装置实施例而言，由于其基本相似于方法实施例，所以描述的比较简单，相关之处请参见放方法实施例中的对应部分说明即可。
需要说明的是，在本文中，诸如第一和第二等之类的关系术语仅仅用来将一个实体或者操作与另一个实体或操作区分开来，而不一定要求或者暗示这些实体或操作之间存在任何这种实际的关系或者顺序。而且，术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含，从而使得包括一系列要素的过程、方法、物品或者设备不仅包括那些要素，而且还包括没有明确列出的其他要素，或者是还包括为这种过程、方法、物品或者设备所固有的 要素。在没有更多限制的情况下，由语句“包括一个……”限定的要素，并不排除在包括所述要素的过程、方法、物品或者设备中还存在另外的相同要素。
本说明书中的各个实施例均采用相关的方式描述，各个实施例之间相同相似的部分互相参见即可，每个实施例重点说明的都是与其他实施例的不同之处。尤其，对于装置实施例而言，由于其基本相似于方法实施例，所以描述的比较简单，相关之处参见方法实施例的部分说明即可。
以上所述仅为本发明的较佳实施例而已，并非用于限定本发明的保护范围。凡在本发明的精神和原则之内所作的任何修改、等同替换、改进等，均包含在本发明的保护范围内。

Claims (12)

  1. 一种投影亮度调节方法，其特征在于，所述方法包括：
    获得环境光亮度值以及投影距离值；
    根据所述环境光亮度值和所述投影距离值，获得投影亮度值；
    根据所述投影亮度值调节投影亮度。
  2. 根据权利要求1所述方法，其特征在于，所述根据所述环境光亮度值和所述投影距离值，获得投影亮度值，包括：
    根据所述环境光亮度值和所述投影距离值在预设数据表中查找，获得投影亮度值，其中，所述预设数据表为：用于记录投影亮度值、环境光亮度值和投影距离值三者之间对应关系的数据表；
    或，根据所述环境光亮度值、所述投影距离值以及预设的第一变换函数，获得投影亮度值，其中，所述预设的第一变换函数为：投影亮度关于环境光亮度和投影距离的变换函数；
    或，获得待投影图像的画面信息，根据所述画面信息、所述环境光亮度值、所述投影距离值以及预设的第二变换函数，获得投影亮度值，所述预设的第二变换函数为：投影亮度关于环境光亮度和投影距离的变换函数。
  3. 根据权利要求2所述方法，其特征在于，所述预设数据表通过如下方式获得：
    按照预设的测试规则，获得不同环境光亮度值以及不同投影距离值情况下的投影亮度值；
    根据所获得的投影亮度值以及其对应的环境光亮度值、其对应的投影距离值，生成一组针对所获得的投影亮度的对应关系；
    根据所生成的对应关系，获得所述预设数据表。
  4. 根据权利要求2所述方法，其特征在于，所述预设的第一变换函数通过如下步骤获得：
    在所述投影距离值为预设投影距离值的情况下，按照预设的环境光亮度变换规则改变所述环境光亮度值，获得每一个改变后的所述环境光亮度值对应的投影亮度值；
    按照预设的第一曲线拟合算法，对所获得的投影亮度值及其对应的环境光亮度值进行曲线拟合，获得投影亮度关于环境光亮度的函数f(AL)，其中，AL表示环境光亮度；
    在所述环境光亮度值为预设环境光亮度值的情况下，按照预设的投影距离值变换规则改变所述投影距离值，获得每一个改变后的所述投影距离值对应的投影亮度值；
    按照预设的第二曲线拟合算法，对所获得的投影亮度值及其对应的投影距离值进行曲线拟合，获得投影亮度关于投影距离的函数g(D)，其中，D表示投影距离；
    根据所述函数f(AL)和所述函数g(D)，获得所述预设的第一变换函数。
  5. 根据权利要求4所述的方法，其特征在于，所述根据所述函数f(AL)和所述函数g(D)，获得所述预设的变换函数，包括：
    根据以下表达式，获得所述预设的第一变换函数L(AL,D)，
    L(AL,D)＝f(AL)*g(D)。
  6. 根据权利要求2所述的方法，其特征在于，所述获得待投影图像的画面信息，根据所述画面信息、所述环境光亮度值、所述投影距离值以及预设的第二变换函数，获得投影亮度值，包括：
    获得待投影图像的颜色直方图统计值和/或所述待投影图像的图像画面复杂度；
    根据所述颜色直方图统计值和/或所述图像画面复杂度，确定调整系数；
    根据所述调整系数、所述环境光亮度值、所述投影距离值以及预设的第二变换函数，获得投影亮度值。
  7. 一种投影亮度调节装置，其特征在于，所述装置包括：
    参数值获得模块，用于获得环境光亮度值以及获得投影距离值；
    投影亮度值获得模块，用于根据所述环境光亮度值和所述投影距离值，获得投影亮度值；
    投影亮度调节模块，用于根据所述投影亮度值调节投影亮度。
  8. 根据权利要求7所述装置，其特征在于，所述投影亮度值获得模块，具体用于：
    根据所述环境光亮度值和所述投影距离值在预设数据表中查找，获得投影亮度值，其中，所述预设数据表为：用于记录投影亮度值、环境光亮度值和投影距离值三者之间对应关系的数据表；
    或，根据所述环境光亮度值、所述投影距离值以及预设的第一变换函数，获得投影亮度值，其中，所述预设的第一变换函数为：投影亮度关于环境光亮度和投影距离的变换函数；
    或，获得待投影图像的画面信息，根据所述画面信息、所述环境光亮度值、所述投影距离值以及预设的第二变换函数，获得投影亮度值，所述预设的第二变换函数为：投影亮度关于环境光亮度和投影距离的变换函数。
  9. 根据权利要求8所述装置，其特征在于，所述装置还包括：
    数据表获得模块，用于获得所述预设数据表；
    其中，所述数据表获得模块，包括：
    第一投影亮度值获得子模块，用于按照预设的测试规则，获得不同环境光亮度值以及不同投影距离值情况下的投影亮度值；
    对应关系生成子模块，用于根据所获得的投影亮度以及其对应的环境光亮度、其对应的投影距离，生成一组针对所获得的投影亮度的对应关系；
    数据表获得子模块，用于根据所生成的对应关系，获得所述预设数据表。
  10. 根据权利要求8所述装置，其特征在于，所述装置还包括：
    变换函数获得模块，用于获得所述预设的第一变换函数；
    其中，所述变换函数获得模块，包括：
    第二投影亮度值获得子模块，用于在所述投影距离值为预设投影距离值的情况下，按照预设的环境光亮度变换规则改变所述环境光亮度值，获得每一个改变后的所述环境光亮度值对应的投影亮度值；
    第一函数获得子模块，用于按照预设的第一曲线拟合算法，对所获得的投影亮度值及其对应的环境光亮度值进行曲线拟合，获得投影亮度关于环境光亮度的函数f(AL)，其中，AL表示环境光亮度；
    第三投影亮度值获得子模块，用于在所述环境光亮度值为预设环境光亮度值的情况下，按照预设的投影距离值变换规则改变所述投影距离值，获得每一个改变后的所述投影距离值对应的投影亮度值；
    第二函数获得子模块，用于按照预设的第二曲线拟合算法，对所获得的投影亮度值及其对应的投影距离值进行曲线拟合，获得投影亮度关于投影距离的函数g(D)，其中，D表示投影距离；
    变换函数获得子模块，用于根据所述函数f(AL)和所述函数g(D)，获得所述预设的第一变换函数。
  11. 根据权利要求10所述的装置，其特征在于，所述变换函数获得子模块，具体用于根据以下表达式，获得所述预设的第一变换函数L(AL,D)，
    L(AL,D)＝f(AL)*g(D)。
  12. 根据权利要求8所述的装置，其特征在于，所述投影亮度值获得模块，包括：
    图像信息获得子模块，用于获得待投影图像的颜色直方图统计值和/或所述待投影图像的图像画面复杂度；
    调整系数确定子模块，用于根据所述颜色直方图统计值和/或所述图像画面复杂度，确定调整系数；
    第四投影亮度值获得子模块，用于根据所述调整系数、所述环境光亮度值、所述投影距离值以及预设的第二变换函数，获得投影亮度值。
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