TW201737701A - System and method for adjusting projection brightness and contrast - Google Patents
System and method for adjusting projection brightness and contrast Download PDFInfo
- Publication number
- TW201737701A TW201737701A TW105110464A TW105110464A TW201737701A TW 201737701 A TW201737701 A TW 201737701A TW 105110464 A TW105110464 A TW 105110464A TW 105110464 A TW105110464 A TW 105110464A TW 201737701 A TW201737701 A TW 201737701A
- Authority
- TW
- Taiwan
- Prior art keywords
- brightness
- contrast
- value
- projector
- projection
- Prior art date
Links
Landscapes
- Projection Apparatus (AREA)
- Transforming Electric Information Into Light Information (AREA)
Abstract
Description
本發明關於一種投影亮度和對比的自動調整系統及投影亮度和對比的自動調整方法。 The invention relates to an automatic adjustment system for projection brightness and contrast and an automatic adjustment method for projection brightness and contrast.
投影機若持續投射高亮度的畫面,容易造成燈源壽命減少且不易散熱。一般而言,投影機畫面亮度和背景亮度差異過小時,會感覺畫面過暗且色澤不佳,但當投影機畫面亮度和背景亮度差異過大時,觀看畫面時眼睛容易不適。當畫面亮度和背景亮度在適當的比例下,視覺效果較佳且人眼也較舒適,因此,投影機使用時常有即時調整投影亮度的需求。然而,目前的投影機亮度都是以手動方式進行調整而較為不便。 If the projector continues to project a high-brightness screen, it will easily reduce the life of the light source and prevent heat dissipation. Generally speaking, if the brightness difference between the screen brightness and the background brightness of the projector is too small, the picture will be too dark and the color will be poor. However, when the difference between the brightness of the projector screen and the background brightness is too large, the eyes will be easily uncomfortable when viewing the screen. When the brightness of the screen and the background brightness are at an appropriate ratio, the visual effect is better and the human eye is more comfortable. Therefore, the projector often has a need to adjust the projection brightness in real time. However, current projector brightness is manually adjusted and is inconvenient.
本發明提供一種投影亮度和對比的自動調整系統及投影亮度和對比的自動調整方法。 The invention provides an automatic adjustment system for projection brightness and contrast and an automatic adjustment method for projection brightness and contrast.
本發明的其他目的和優點可以從本發明所揭露的技術特徵中得到進一步的了解。為達上述之一或部份或全部目的或是其他目的,本發明之一實施例提出一種投影亮度和對比的自動調整系統。投影亮度和對比的自動調整系統包含一影像擷取單元、一亮度量測單元、一測距單元、一亮度調整單元及一對比調整單元。影像擷取單元擷取一影像以取得投影區域或投影區域外的一背景區域的亮度,且亮度量測單元依據影像擷取單元的取像參數及投影機的鏡頭特性參數計算出一環境亮度值。測距單元依據投影機的自動對焦位置與 鏡頭特性參數計算出一對焦距離,且亮度調整單元依據對焦距離、環境亮度值及一亮度增大倍率計算出一輸出發光強度值,其中亮度增大倍率為一預設舒適亮度值與環境亮度值的比值,且投影機依據輸出發光強度值調整投射至投影區域的亮度。對比調整單元參考亮度增大倍率設定一輸出對比值,且投影機依據輸出對比值調整投影區域的對比。 Other objects and advantages of the present invention will become apparent from the technical features disclosed herein. In order to achieve one or a portion or all of the above or other objects, an embodiment of the present invention provides an automatic adjustment system for projection brightness and contrast. The automatic adjustment system for projecting brightness and contrast comprises an image capturing unit, a brightness measuring unit, a ranging unit, a brightness adjusting unit and a contrast adjusting unit. The image capturing unit captures an image to obtain brightness of a background area outside the projection area or the projection area, and the brightness measuring unit calculates an ambient brightness value according to the image capturing parameter of the image capturing unit and the lens characteristic parameter of the projector. . The ranging unit is based on the projector's AF position and The lens characteristic parameter calculates a focusing distance, and the brightness adjusting unit calculates an output luminous intensity value according to the focusing distance, the ambient brightness value and a brightness increasing magnification, wherein the brightness increasing magnification is a preset comfort brightness value and an ambient brightness value. The ratio, and the projector adjusts the brightness projected onto the projection area based on the output illumination intensity value. The contrast adjustment unit sets an output contrast value with reference brightness increase magnification, and the projector adjusts the contrast of the projection area according to the output contrast value.
藉由上述實施例的設計,投影機可以依據目前的環境亮度來自動調整畫面所需亮度或對比,提高畫面亮度調整的機動性及便利性,且透過投影機亮度或對比自動調整的功能,可避免持續使用高亮度投射畫面,故可延長燈源使用壽命並減少散熱需求。 According to the design of the above embodiment, the projector can automatically adjust the brightness or contrast required by the screen according to the current ambient brightness, improve the flexibility and convenience of the brightness adjustment of the screen, and can automatically adjust the brightness or contrast of the projector. Avoid continuous use of high-brightness projection screens, thus extending lamp life and reducing heat dissipation requirements.
本發明的其他目的和優點可以從本發明所揭露的技術特徵中得到進一步的了解。為讓本發明之上述和其他目的、特徵和優點能更明顯易懂,下文特舉實施例並配合所附圖式,作詳細說明如下。 Other objects and advantages of the present invention will become apparent from the technical features disclosed herein. The above and other objects, features, and advantages of the invention will be apparent from
10‧‧‧投影亮度和對比的自動調整系統 10‧‧‧Automatic adjustment system for projection brightness and contrast
12‧‧‧影像擷取單元 12‧‧‧Image capture unit
14‧‧‧亮度量測單元 14‧‧‧Brightness measurement unit
16‧‧‧測距單元 16‧‧‧Ranging unit
18‧‧‧亮度調整單元 18‧‧‧Brightness adjustment unit
19‧‧‧對比調整單元 19‧‧‧Contrast adjustment unit
21‧‧‧自動對焦單元 21‧‧‧Auto Focus Unit
22‧‧‧投影機 22‧‧‧Projector
22a‧‧‧鏡頭 22a‧‧‧ lens
23‧‧‧處理器 23‧‧‧ Processor
24‧‧‧攝像頭 24‧‧‧ camera
24a‧‧‧取像鏡頭 24a‧‧‧Image lens
24b‧‧‧光感測器 24b‧‧‧Photosensor
25‧‧‧光源驅動器 25‧‧‧Light source driver
26‧‧‧影像 26‧‧‧Image
27‧‧‧影像處理器 27‧‧‧Image Processor
28‧‧‧影像處理單元 28‧‧‧Image Processing Unit
29‧‧‧處理器 29‧‧‧Processor
32‧‧‧屏幕 32‧‧‧ screen
A‧‧‧投影區域 A‧‧‧projection area
B‧‧‧背景區域 B‧‧‧Background area
C‧‧‧對比值 C‧‧‧ contrast value
F‧‧‧亮度修正因子 F‧‧‧Brightness correction factor
I‧‧‧影像 I‧‧‧ images
L‧‧‧對焦距離 L‧‧‧Focus distance
N‧‧‧亮度增大倍率 N‧‧‧ brightness increase magnification
O‧‧‧輸出發光強度值 O‧‧‧Output luminous intensity value
S‧‧‧環境亮度值 S‧‧‧Environmental brightness value
S1、S2‧‧‧Gamma曲線 S1, S2‧‧‧Gamma curve
圖1為本發明一實施例的投影亮度和對比的自動調整系統的方塊示意圖。 1 is a block diagram showing an automatic adjustment system for projection brightness and contrast according to an embodiment of the present invention.
圖2及圖3為說明圖1的自動調整系統的一構件組成實例的示意圖。 2 and 3 are schematic views illustrating an example of the constitution of a component of the automatic adjustment system of Fig. 1.
圖4為本發明一實施例,顯示取像區域與投影區域的相對位置的示意圖。 4 is a schematic diagram showing a relative position of an image capturing area and a projected area according to an embodiment of the present invention.
圖5為說明由對焦距離計算輸出發光強度值之一例的示意圖。 Fig. 5 is a schematic view showing an example of calculating an output luminous intensity value from the focusing distance.
圖6為說明藉由設定不同Gamma曲線調整對比的示意圖。 Figure 6 is a diagram illustrating the adjustment of contrast by setting different gamma curves.
圖7為本發明一實施例的投影亮度和對比的自動調整方法的流程圖。 FIG. 7 is a flowchart of a method for automatically adjusting projection brightness and contrast according to an embodiment of the present invention.
圖8為本發明另一實施例的投影亮度和對比的自動調整方法的流程圖。 FIG. 8 is a flowchart of a method for automatically adjusting projection brightness and contrast according to another embodiment of the present invention.
圖9為本發明另一實施例的投影亮度和對比的自動調整方法的流程圖。 FIG. 9 is a flowchart of a method for automatically adjusting projection brightness and contrast according to another embodiment of the present invention.
圖10為本發明另一實施例,顯示取像區域與投影區域的相對位置的示意圖。 FIG. 10 is a schematic diagram showing a relative position of an image capturing area and a projected area according to another embodiment of the present invention.
有關本發明之前述及其他技術內容、特點與功效,在以下配合參考圖式之實施例的詳細說明中,將可清楚的呈現。以下實施例中所提到的方向用語,例如:上、下、左、右、前或後等,僅是參考附加圖式的方向。因此,使用的方向用語是用來說明並非用來限制本發明。 The above and other technical contents, features and advantages of the present invention will be apparent from the following detailed description of the embodiments of the invention. The directional terms mentioned in the following embodiments, such as up, down, left, right, front or back, etc., are only directions referring to the additional drawings. Therefore, the directional terminology used is for the purpose of illustration and not limitation.
圖1為本發明一實施例的投影亮度和對比的自動調整系統的示意圖。投影亮度和對比的自動調整系統10可依據周遭環境的亮度來自動調整投影畫面所需亮度或對比,使觀察者觀看到相對人眼較為舒適的投影畫面。如圖1所示,投影亮度和對比的自動調整系統10可包含一影像擷取單元12、一亮度量測單元14、一測距單元16、一亮度調整單元18以及一對比調整單元19。影像擷取單元12可擷取一影像I以取得一投影區域或者投影區域外的一背景區域的亮度,且亮度量測單元14可依據影像擷取單元12的取像參數及投影機的鏡頭特性參數計算出一環境亮度值S。測距單元16可依據投影機22的自動對焦位置與鏡頭特性參數計算出一對焦距離L,且亮度調整單元18可依據對焦距離L、環境亮度值S及一亮度增大倍率N計算 出一輸出發光強度值O,亮度增大倍率N可為一預設舒適亮度值與環境亮度值S的比值,投影機22可依據輸出發光強度值O調整投射至投影區域的亮度。對比調整單元19可參考亮度增大倍率N設定一輸出對比值C,且投影機22依據輸出對比值C調整投影區域的對比。如圖2所示,於一實施例中,投影機22可具有自動對焦單元21而具有自動對焦的功能,且可經由鏡頭22a投射影像到例如屏幕32的物件上,影像擷取單元12例如可為如圖3所示的一攝像頭24,攝像頭24例如可設置於投影機22上但不限定,測距單元16及亮度調整單元18例如可為一處理器23所構成,處理器23可提供計算對焦距離L、亮度增大倍率N及輸出發光強度值O的功能,亮度調整單元18例如可為投影機22的光源驅動器25,光源驅動器25可依據輸出發光強度值O調整發光強度,進而改變投射至投影區域的亮度。處理器23例如可設置於自動對焦單元21內或其他裝置而不限定。對比調整單元19例如可為投影機22的一影像處理器27,影像處理器27可依據設定的輸出對比值C調整輸出亮度的Gamma曲線。如圖3所示,攝像頭24例如可包含收集光訊號的取像鏡頭24a及將光訊號轉為電子信號的光感測器24b,電子信號再由影像處理單元28進行後續的影像處理。攝像頭24及影像處理單元28例如可為一相機中的元件。於一實施例中,亮度量測單元14可為影像處理單元28中的一處理器29,處理器29可依據攝像頭24的取像參數及投影機22的鏡頭特性參數計算出環境亮度值S。 1 is a schematic diagram of an automatic adjustment system for projection brightness and contrast according to an embodiment of the present invention. The automatic adjustment system 10 for projecting brightness and contrast can automatically adjust the brightness or contrast required of the projected picture according to the brightness of the surrounding environment, so that the observer can view a projection picture that is more comfortable with respect to the human eye. As shown in FIG. 1 , the automatic brightness adjustment system 10 for projecting brightness and contrast may include an image capturing unit 12 , a brightness measuring unit 14 , a ranging unit 16 , a brightness adjusting unit 18 , and a contrast adjusting unit 19 . The image capturing unit 12 can capture an image I to obtain the brightness of a background area or a background area outside the projection area, and the brightness measuring unit 14 can according to the image capturing parameters of the image capturing unit 12 and the lens characteristics of the projector. The parameter calculates an ambient brightness value S. The ranging unit 16 can calculate a focusing distance L according to the AF position and the lens characteristic parameter of the projector 22, and the brightness adjusting unit 18 can calculate according to the focusing distance L, the ambient brightness value S, and a brightness increasing magnification N. An output luminous intensity value O is obtained, and the brightness increasing magnification N is a ratio of a preset comfort brightness value to an ambient brightness value S, and the projector 22 can adjust the brightness projected to the projection area according to the output luminous intensity value O. The contrast adjustment unit 19 can set an output contrast value C with reference to the brightness increase magnification N, and the projector 22 adjusts the contrast of the projection area according to the output contrast value C. As shown in FIG. 2, in an embodiment, the projector 22 can have an auto-focusing unit 21 and have an auto-focusing function, and can project an image onto the object such as the screen 32 via the lens 22a. The image capturing unit 12 can be, for example, For a camera 24 as shown in FIG. 3, the camera 24 can be disposed on the projector 22, for example, but is not limited. The ranging unit 16 and the brightness adjusting unit 18 can be, for example, a processor 23, and the processor 23 can provide calculations. The function of the focus distance L, the brightness increase magnification N, and the output illumination intensity value O, the brightness adjustment unit 18 can be, for example, the light source driver 25 of the projector 22, and the light source driver 25 can adjust the illumination intensity according to the output illumination intensity value O, thereby changing the projection. The brightness to the projection area. The processor 23 can be provided, for example, in the auto-focus unit 21 or other device without limitation. The contrast adjustment unit 19 can be, for example, an image processor 27 of the projector 22, and the image processor 27 can adjust the Gamma curve of the output brightness according to the set output contrast value C. As shown in FIG. 3, the camera 24 may include, for example, an image taking lens 24a for collecting optical signals and a light sensor 24b for converting optical signals into electronic signals. The electronic signals are then subjected to subsequent image processing by the image processing unit 28. Camera 24 and image processing unit 28 may be, for example, components in a camera. In one embodiment, the brightness measurement unit 14 can be a processor 29 in the image processing unit 28, and the processor 29 can calculate the ambient brightness value S according to the image taking parameters of the camera 24 and the lens characteristic parameters of the projector 22.
如圖4所示,投影機22可於屏幕32上形成一投影區域A,且照相機24可拍攝一包含且大於投影區域A的影像26,因此,影像26中於投影區域A外的區域可視為一背景區域B,照相機24於擷取影像26時,可取得投影區域A或者背景區域B的亮度,亮度 量測單元14可依據攝像頭24的取像參數(例如曝光時間、亮度增益值及灰階位元值)以及投影機22的鏡頭特性參數(例如投影畫面尺寸、鏡頭對焦長度等)計算出一環境亮度值S。再者,測距單元16可依據投影機22的自動對焦位置與鏡頭特性參數計算出一對焦距離L(即投影機完成自動對焦後鏡頭至投射畫面的直線距離)。如下說明利用投影機22的自動對焦功能獲得投影機鏡頭22a與屏幕32間的一對焦距離L的一例。如下表所示,假設投影機22已完成30吋畫面的位置校正,獲得其對應一絕對參考點的位置所需的馬達步數為200步,當投影機22完成自動對焦後,鏡頭22a移動到目前位置所需的馬達步數為124步,因投影屏幕32的位置不變,故可由下表中得出對焦距離為2629mm。再者,若實際馬達步數並未出現於下表中,可使用內插的方式或另外建立每一步數對應對焦距離的表格來獲得對焦距離。 As shown in FIG. 4, the projector 22 can form a projection area A on the screen 32, and the camera 24 can capture an image 26 that is larger than the projection area A. Therefore, the area of the image 26 outside the projection area A can be regarded as In the background area B, when the camera 24 captures the image 26, the brightness of the projection area A or the background area B can be obtained. The measuring unit 14 can calculate an environment according to the image taking parameters of the camera 24 (such as exposure time, brightness gain value and gray scale bit value) and the lens characteristic parameters of the projector 22 (for example, the projected picture size, the lens focus length, etc.). Brightness value S. Furthermore, the ranging unit 16 can calculate a focus distance L according to the auto focus position and the lens characteristic parameter of the projector 22 (ie, the linear distance of the lens to the projected picture after the projector completes autofocus). An example of obtaining a focus distance L between the projector lens 22a and the screen 32 by the autofocus function of the projector 22 will be described below. As shown in the following table, assuming that the projector 22 has completed the position correction of the 30-inch picture, the number of motor steps required to obtain the position corresponding to an absolute reference point is 200 steps. When the projector 22 completes the auto-focus, the lens 22a moves to The number of motor steps required for the current position is 124 steps. Since the position of the projection screen 32 is unchanged, the focusing distance can be 2629 mm from the table below. Furthermore, if the actual number of motor steps does not appear in the table below, the focus distance can be obtained by interpolation or by additionally creating a table of the number of steps corresponding to each step.
投影畫面所需的預設舒適亮度值可設定為環境亮度 值S的N倍(N>1),亦即,當測得環境亮度值S後,投影畫面的亮度調整為環境亮度值的N倍時可獲得具有舒適亮度的畫面,N值可定義為亮度增大倍率。因此,於一實施例中,若投影機具有投射出N倍的亮度值的能力時,可依據對焦距離L、環境亮度值S及亮度增大倍率N計算出投影機光源所需的一輸出發光強度值O而即時調整投射至投影區域A的亮度。於一實施例中,投影機22的光源驅動器25輸出的輸出發光強度值O可以由下列的式子獲得: 輸出發光強度值O(lm)=環境亮度值(lm/m2)×亮度增益倍率N×投影區域面積(m2)=環境亮度值S(lm/m2)×亮度增大倍率N×對焦距離L(m)×tanθv×(2×對焦距離L(m)×tanθH);式中參數之定義如圖5所示,其中θH是投影區域A相對光軸的水平夾角,且tanθV是投影畫面相對光軸的垂直夾角。 The preset comfort brightness value required for the projected picture can be set to N times the ambient brightness value S (N>1), that is, when the ambient brightness value S is measured, the brightness of the projected picture is adjusted to N times the ambient brightness value. A picture with comfortable brightness can be obtained, and the N value can be defined as a brightness increase magnification. Therefore, in an embodiment, if the projector has the ability to project N times the brightness value, an output illuminance required by the projector light source can be calculated according to the focus distance L, the ambient brightness value S, and the brightness increase magnification N. The intensity value O is used to instantly adjust the brightness projected onto the projection area A. In an embodiment, the output luminous intensity value O output by the light source driver 25 of the projector 22 can be obtained by the following formula: Output luminous intensity value O (lm) = ambient brightness value (lm / m 2 ) × brightness gain ratio N × projection area area (m 2 ) = ambient brightness value S (lm / m 2 ) × brightness increase magnification N × focus distance L (m) × tan θ v × (2 × focus distance L (m) × tan θ H ); The definition of the parameters in the formula is as shown in Fig. 5, where θ H is the horizontal angle of the projection area A with respect to the optical axis, and tan θ V is the vertical angle of the projection picture with respect to the optical axis.
於一實施例中,當投影機22的光源無法達到投射出N倍的亮度值的能力時,對比調整單元19可如圖6所示選擇加強輸出對比的Gamma曲線S1,藉以彌補亮度增強的不足以獲得較佳的投影畫面品質。於另一實施例中,亦可先調整對比的Gamma曲線後再考慮調高亮度增益倍率N,如此可獲得以較小的亮度增益倍率N得到良好的畫面的效果,藉以節省光源耗電量。於另一實施例中,亦可考慮同時調整對比的Gamma曲線(例如選擇曲線S1加強對比或曲線S2減弱對比)與亮度增益倍率N,以獲得不錯的畫面品質同時能達到節能效果。 In an embodiment, when the light source of the projector 22 cannot reach the capability of projecting N times the brightness value, the contrast adjusting unit 19 can select the Gamma curve S1 for enhancing the output contrast as shown in FIG. 6 to compensate for the lack of brightness enhancement. For better projection picture quality. In another embodiment, the contrast gamma curve may be adjusted first, and then the brightness gain magnification N may be increased, so that a good picture with a small brightness gain ratio N can be obtained, thereby saving power consumption of the light source. In another embodiment, it is also conceivable to simultaneously adjust the contrast gamma curve (for example, the selection curve S1 to strengthen the contrast or the curve S2 to weaken the contrast) and the brightness gain ratio N to obtain a good picture quality while achieving energy saving effects.
以下表為例,若亮度增益倍率N設定在5-7倍,Gamma可在25-75%的範圍內藉由表值選定,以獲得不錯的畫面品質同時能達到節能效果。於本實施例中,表值可依據公式訂出:例如[Nn,Gn]=[(7-0.2n),(25+5n)]。 For example, if the brightness gain ratio N is set to 5-7 times, Gamma can be selected by the table value in the range of 25-75% to obtain good picture quality and achieve energy saving effect. In this embodiment, the table value can be determined according to the formula: for example, [Nn, Gn]=[(7-0.2n), (25+5n)].
於另一實施例中,如下表所示,表值可不依公式直接由經驗值或需求訂出:
於一實施例中,如圖7所示,一種投影亮度和對比的自動調整方法可包含下列步驟: In an embodiment, as shown in FIG. 7, an automatic adjustment method of projection brightness and contrast may include the following steps:
步驟S102:將系統開機。 Step S102: Turn on the system.
步驟S104:利用一影像擷取單元擷取一影像以取得該投影區域或者投影區域外的一背景區域的亮度。 Step S104: Capture an image by using an image capturing unit to obtain brightness of a background area outside the projection area or the projection area.
步驟S106:依據影像擷取單元的取像參數及投影機的鏡頭特性參數計算出一環境亮度值。 Step S106: Calculate an ambient brightness value according to the image capturing parameter of the image capturing unit and the lens characteristic parameter of the projector.
步驟S108:進行投影機的自動對焦操作。 Step S108: Perform an autofocus operation of the projector.
步驟S110:依據投影機的對焦位置與鏡頭特性參 數計算出一對焦距離。 Step S110: According to the focus position and lens characteristic of the projector The number calculates a focus distance.
步驟S112:依據對焦距離及環境亮度值計算出一輸出亮度值,且投影機依據輸出亮度值及亮度增益倍率調整投射至投影區域的亮度及對比。再者,可視周遭環境亮度變化即時調整輸出亮度及對比(步驟S116),若周遭環境亮度產生變化時,可跳回步驟S104重覆上述流程調整投影畫面亮度及對比,若不需調整則結束本次調整流程,於此「結束」用語代表結束本次調整流程並等待下次環境變化時系統再進行調整(步驟S118)。 Step S112: Calculate an output brightness value according to the focus distance and the ambient brightness value, and the projector adjusts the brightness and contrast projected to the projection area according to the output brightness value and the brightness gain magnification. Furthermore, the output brightness and the contrast can be adjusted in real time according to the ambient brightness change (step S116). If the ambient brightness changes, the process can be repeated by repeating the above process to adjust the brightness and contrast of the projected picture, and if not, the end is The sub-adjustment process, in which the "end" term represents the end of the adjustment process and waits for the next environmental change to be adjusted (step S118).
如圖8所示,於另一實施例中,一種投影亮度和對比的自動調整方法可包含下列步驟: As shown in FIG. 8, in another embodiment, an automatic adjustment method of projection brightness and contrast may include the following steps:
步驟S202:將系統開機。 Step S202: Turn on the system.
步驟S204:進行投影機的自動對焦操作。 Step S204: Perform an autofocus operation of the projector.
步驟S206:利用一影像擷取單元擷取一影像以取得投影區域或者投影區域外的一背景區域的亮度。 Step S206: Capture an image by using an image capturing unit to obtain brightness of a background area outside the projection area or the projection area.
步驟S208:依據影像擷取單元的取像參數及投影機的鏡頭特性參數計算出一環境亮度值。 Step S208: Calculate an ambient brightness value according to the image capturing parameter of the image capturing unit and the lens characteristic parameter of the projector.
步驟S210:依據投影機的自動對焦位置與鏡頭特性參數計算出一對焦距離。 Step S210: Calculate a focus distance according to the auto focus position and the lens characteristic parameter of the projector.
步驟S212:依據對焦距離及環境亮度值計算出一輸出亮度值,投影機依據輸出亮度值及亮度增益倍率調整投射至投影區域的亮度及對比。再者,例如當投影機移動或其它因素而有重新對焦的需要時(步驟S216),可跳回步驟S204重覆上述流程調整投影畫面亮度及對比,若不需調整則結束本次調整流程,於此「結束」用語代表結束本次調整流程並等待下次環境變化時系統再進行調整(步驟S218)。 Step S212: Calculate an output brightness value according to the focus distance and the ambient brightness value, and the projector adjusts the brightness and contrast projected to the projection area according to the output brightness value and the brightness gain magnification. Furthermore, for example, when the projector moves or other factors have the need to refocus (step S216), the process may be repeated by step S204 to repeat the above process to adjust the brightness and contrast of the projected screen. If no adjustment is needed, the adjustment process is ended. Here, the term "end" means that the current adjustment process is ended and the system waits for the next environmental change to be adjusted (step S218).
如圖7及圖8所示的亮度調整流程僅為示例而不限定,於其他的實施例中,例如亦可同時進行投影機的自動對焦及影像擷取單元擷取影像的操作。再者,雖然圖7及圖8所示為同時調整投影區域的亮度及對比的調整流程,但其並不限定,亦可視各種因素(例如投影機出光能力、節能效率、畫面品質需求)等僅調整投影區域的亮度或僅調整投影區域的對比。再者,無論投影機22採用自動對焦或手動對焦方式,均能實施前述的投影區域的對比調整流程。 The brightness adjustment process shown in FIG. 7 and FIG. 8 is only an example and is not limited. In other embodiments, for example, the autofocus of the projector and the operation of capturing images by the image capturing unit may be performed simultaneously. In addition, although FIG. 7 and FIG. 8 show the adjustment process of adjusting the brightness and contrast of the projection area at the same time, it is not limited, and various factors (such as projector light-emitting capability, energy-saving efficiency, and screen quality requirements) may be used. Adjust the brightness of the projected area or adjust only the contrast of the projected area. Furthermore, the contrast adjustment process of the aforementioned projection area can be implemented regardless of whether the projector 22 adopts an auto focus or a manual focus mode.
綜上所述,本發明之實施例至少具有下列其中一個優點:藉由上述各個實施例的設計,投影機可以依據目前的環境亮度來自動調整畫面所需亮度或對比,提高畫面亮度調整的機動性及便利性,且透過投影機亮度或對比的自動調整的功能,可避免持續使用高亮度投射畫面,故可延長燈源使用壽命並減少散熱需求。 In summary, the embodiment of the present invention has at least one of the following advantages: by the design of the above various embodiments, the projector can automatically adjust the brightness or contrast required for the picture according to the current ambient brightness, and improve the maneuver of the brightness adjustment of the picture. Sexuality and convenience, and through the automatic adjustment of the brightness or contrast of the projector, the continuous use of high-brightness projection images can be avoided, thus extending the life of the light source and reducing the heat dissipation requirement.
如圖9所示,於另一實施例中,一種投影亮度的自動調整方法可包含下列步驟: As shown in FIG. 9, in another embodiment, an automatic adjustment method of projection brightness may include the following steps:
步驟S302:將系統開機。 Step S302: Turn on the system.
步驟S304:進行投影機的自動對焦操作。 Step S304: Perform an autofocus operation of the projector.
步驟S306:利用一影像擷取單元擷取一影像以取得該投影區域以及投影區域外的一背景區域的亮度。 Step S306: Capture an image by using an image capturing unit to obtain brightness of the projection area and a background area outside the projection area.
步驟S308:依據影像擷取單元的取像參數及投影機的鏡頭特性參數計算出一環境亮度值。 Step S308: Calculate an ambient brightness value according to the image capturing parameter of the image capturing unit and the lens characteristic parameter of the projector.
步驟S310:判斷投影區域的亮度經由一亮度修正因子加權計算後所得之加權值,是否達到預設的舒適亮度。於一實施例中,預設舒適亮度值可為環境亮度值的N倍(=環境亮度值(lm/m2)×N),亮度修正因子F之值可為投影畫面的畫素總數除以所有畫素的亮 度值之總和,因此當目前投影亮度值(lm/m2)乘上亮度修正因子F所得之加權值,不等於預設舒適亮度值時,則增加或減少投影機的亮度(步驟S312)並跳至步驟S306重覆上述流程,直到該加權值等於預設舒適亮度值時結束本次調整流程,於此「結束」用語代表結束本次調整流程並等待下次環境變化時系統再進行調整(步驟S314)。 Step S310: determining whether the brightness of the projection area is weighted by a brightness correction factor, and whether the preset comfort brightness is reached. In an embodiment, the preset comfort brightness value may be N times the ambient brightness value (=ambient brightness value (lm/m 2 )×N), and the brightness correction factor F may be the total number of pixels of the projected picture divided by The sum of the brightness values of all the pixels, so when the current projection brightness value (lm/m 2 ) multiplied by the brightness correction factor F is not equal to the preset comfort brightness value, the brightness of the projector is increased or decreased ( Step S312) and skipping to step S306 to repeat the above process until the weighting value is equal to the preset comfort brightness value, ending the adjustment process, where the "end" term represents the system that ends the adjustment process and waits for the next environmental change. Adjustment is further made (step S314).
藉由本實施例的設計,不需計算出對焦距離亦能獲得投影亮度和對比的自動調整的效果。 With the design of the embodiment, the effect of automatic adjustment of the projection brightness and contrast can be obtained without calculating the focusing distance.
如圖10所示,於一實施例中,若影像擷取單元12擷取的影像26範圍小於投影機22的一投影區域A,可在投影時插入黑畫面或未投影時量測以獲得背景亮度,同樣可依據對焦距離及環境亮度值計算出一輸出亮度值。 As shown in FIG. 10, in an embodiment, if the image 26 captured by the image capturing unit 12 has a smaller range than the projection area A of the projector 22, the black screen may be inserted during projection or measured when not projected to obtain a background. Brightness, also can be calculated according to the focus distance and ambient brightness value.
惟以上所述者,僅為本發明之較佳實施例而已,當不能以此限定本發明實施之範圍,即大凡依本發明申請專利範圍及發明說明內容所作之簡單的等效變化與修飾,皆仍屬本發明專利涵蓋之範圍內。另外本發明的任一實施例或申請專利範圍不須達成本發明所揭露之全部目的或優點或特點。此外,本說明書或申請專利範圍中提及的「第一」、「第二」等用語僅用以命名元件的名稱或區別不同實施例或範圍,而並非用來限制元件數量上的上限或下限。 The above is only the preferred embodiment of the present invention, and the scope of the invention is not limited thereto, that is, the simple equivalent changes and modifications made by the scope of the invention and the description of the invention are All remain within the scope of the invention patent. In addition, any of the objects or advantages or features of the present invention are not required to be achieved by any embodiment or application of the invention. In addition, the terms "first" and "second" as used in the specification or the scope of the claims are only used to name the components or distinguish different embodiments or ranges, and are not intended to limit the upper or lower limits of the number of components. .
10‧‧‧投影亮度和對比的自動調整系統 10‧‧‧Automatic adjustment system for projection brightness and contrast
12‧‧‧影像擷取單元 12‧‧‧Image capture unit
14‧‧‧亮度量測單元 14‧‧‧Brightness measurement unit
16‧‧‧測距單元 16‧‧‧Ranging unit
18‧‧‧亮度調整單元 18‧‧‧Brightness adjustment unit
19‧‧‧對比調整單元 19‧‧‧Contrast adjustment unit
22‧‧‧投影機 22‧‧‧Projector
Claims (13)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
TW105110464A TWI703868B (en) | 2016-04-01 | 2016-04-01 | System and method for adjusting projection brightness and contrast |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
TW105110464A TWI703868B (en) | 2016-04-01 | 2016-04-01 | System and method for adjusting projection brightness and contrast |
Publications (2)
Publication Number | Publication Date |
---|---|
TW201737701A true TW201737701A (en) | 2017-10-16 |
TWI703868B TWI703868B (en) | 2020-09-01 |
Family
ID=61021534
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
TW105110464A TWI703868B (en) | 2016-04-01 | 2016-04-01 | System and method for adjusting projection brightness and contrast |
Country Status (1)
Country | Link |
---|---|
TW (1) | TWI703868B (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109036235A (en) * | 2018-09-10 | 2018-12-18 | 天津大学 | Automatic brightness adjustment projector |
CN113727084A (en) * | 2021-11-03 | 2021-11-30 | 恒林家居股份有限公司 | Self-adaptive brightness control method and system for projection equipment |
US11218674B2 (en) | 2019-08-23 | 2022-01-04 | Coretronic Corporation | Projection device and brightness adjusting method thereof |
CN114143523A (en) * | 2021-12-10 | 2022-03-04 | 深圳市火乐科技发展有限公司 | Brightness adjusting method and device, projection equipment and storage medium |
US20220408065A1 (en) * | 2019-11-25 | 2022-12-22 | Chengdu Xgimi Technology Co., Ltd. | Self-adaptive Adjustment Method and Adjustment System for Brightness of Projection Apparatus |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103424974B (en) * | 2012-05-22 | 2015-09-23 | 宏碁股份有限公司 | Projection arrangement and focusing method |
CN104111579B (en) * | 2014-07-04 | 2016-05-25 | 深圳市雅图新媒体科技有限公司 | Regulate in real time method and the projector of contrast ratio of projector |
-
2016
- 2016-04-01 TW TW105110464A patent/TWI703868B/en active
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109036235A (en) * | 2018-09-10 | 2018-12-18 | 天津大学 | Automatic brightness adjustment projector |
US11218674B2 (en) | 2019-08-23 | 2022-01-04 | Coretronic Corporation | Projection device and brightness adjusting method thereof |
US20220408065A1 (en) * | 2019-11-25 | 2022-12-22 | Chengdu Xgimi Technology Co., Ltd. | Self-adaptive Adjustment Method and Adjustment System for Brightness of Projection Apparatus |
US11818513B2 (en) * | 2019-11-25 | 2023-11-14 | Chengdu Xgimi Technology Co., Ltd. | Self-adaptive adjustment method and adjustment system for brightness of projection apparatus |
CN113727084A (en) * | 2021-11-03 | 2021-11-30 | 恒林家居股份有限公司 | Self-adaptive brightness control method and system for projection equipment |
CN113727084B (en) * | 2021-11-03 | 2022-02-08 | 恒林家居股份有限公司 | Self-adaptive brightness control method and system for projection equipment |
CN114143523A (en) * | 2021-12-10 | 2022-03-04 | 深圳市火乐科技发展有限公司 | Brightness adjusting method and device, projection equipment and storage medium |
Also Published As
Publication number | Publication date |
---|---|
TWI703868B (en) | 2020-09-01 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN107305312B (en) | Automatic adjustment system and method for projection brightness and contrast | |
TWI703868B (en) | System and method for adjusting projection brightness and contrast | |
CN104991432B (en) | Method for adjusting laser display brightness | |
US9762806B2 (en) | Imaging apparatus having variable diaphragm | |
US9560278B2 (en) | Imaging device, imaging device drive method, and imaging device control program | |
JP6490029B2 (en) | Microscope and method for generating one combined image from a plurality of individual images of an object | |
JP5986364B2 (en) | Three-dimensional shape measuring apparatus, control method for three-dimensional shape measuring apparatus, and program | |
KR101624654B1 (en) | Focusing apparatus and Focusing method | |
US20170134634A1 (en) | Photographing apparatus, method of controlling the same, and computer-readable recording medium | |
WO2010031252A1 (en) | Method for correcting lightness of electrical display screen | |
JP2017123633A (en) | Light field camera and video processing method therefor | |
WO2010134366A1 (en) | Monitoring apparatus | |
US20090206235A1 (en) | Method and device for adjusting flash intensity | |
TWI393981B (en) | Use the flash to assist in detecting focal lengths | |
US9113095B2 (en) | Imaging device with the autofocus | |
JP2010062668A (en) | Image processing apparatus, image processing method, program, and image capturing apparatus | |
WO2020155995A1 (en) | Projection method and projection device | |
WO2017051511A1 (en) | Illuminance acquiring device, illuminance control system, and program | |
US20110249140A1 (en) | Electronic camera | |
JP5609459B2 (en) | Binarization processing method and image processing apparatus | |
CN209731466U (en) | The projector of adaptive out-of-flatness curtain correction | |
TWI511549B (en) | Image processing method and image processing system | |
US20190052803A1 (en) | Image processing system, imaging apparatus, image processing apparatus, control method, and storage medium | |
US20240114117A1 (en) | Method for adjusting projection system and projection system | |
KR101217785B1 (en) | Video camera with adjustable brightness of light and method for adjusting of the same |