TWI387947B - Screen brightness adjustment system and method same - Google Patents
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Description
本發明涉及一種屏幕亮度調節系統和方法，特別涉及一種可根據外界環境之亮度自動調節屏幕亮度之屏幕亮度調節系統和方法。 The invention relates to a screen brightness adjusting system and method, in particular to a screen brightness adjusting system and method capable of automatically adjusting screen brightness according to the brightness of an external environment.
許多電子影像裝置(如數位相機、數位攝像機等)通過其內置屏幕來顯示所截取之圖像和各種操作資訊，其屏幕之亮度需根據外界環境亮度之變化進行調節以獲得較好之視覺效果。 Many electronic imaging devices (such as digital cameras, digital cameras, etc.) display captured images and various operational information through their built-in screens. The brightness of the screen needs to be adjusted according to changes in the brightness of the external environment to obtain better visual effects.
現有電子影像裝置之內置屏幕亮度調節功能通常是以手動調節之方式進入功能表模式裏找到屏幕亮度調節之功能選項進行微調操作。此種調節方法在每次外界環境亮度發生變化後均需要進行手動調節顯得十分麻煩，而且對於不熟悉電子影像裝置之初次使用者來說，要從複雜之功能表模式裏尋找屏幕亮度調節之功能選項也顯得十分不便。 The built-in screen brightness adjustment function of the existing electronic image device is usually performed by manually adjusting the function mode to find the screen brightness adjustment function in the function mode to perform fine adjustment operation. This adjustment method is very troublesome in that each time the brightness of the external environment needs to be manually adjusted, and for the first time users who are not familiar with the electronic image device, it is necessary to find the function of the screen brightness adjustment from the complicated function table mode. The options are also very inconvenient.
一種屏幕亮度調節系統，該系統包括顯示屏幕、亮度調節控制器、影像攝取裝置和同步訊號發生器，該亮度調節控制器進一步包括：測光模組，用於計算所攝取圖像之平均亮度值並判斷其是否在預先設定於該測光模組中之理想圖像平均亮度值之範圍內。 A screen brightness adjustment system, the system comprising a display screen, a brightness adjustment controller, an image capture device and a synchronization signal generator, the brightness adjustment controller further comprising: a light metering module, configured to calculate an average brightness value of the captured image and It is determined whether it is within a range of an ideal image average brightness value preset in the photometric module.
攝像參數設定模組，用於根據該測光模組之比較結果來設定攝像參數，如光圈值、快門時間和感光度值。 The camera parameter setting module is configured to set imaging parameters such as an aperture value, a shutter time, and a sensitivity value according to the comparison result of the light metering module.
外界環境亮度值計算模組，用於根據符合理想圖像平均亮度值要求之攝像參數計算出外界環境亮度值。 The external environment brightness value calculation module is configured to calculate the ambient environment brightness value according to the imaging parameters that meet the requirements of the ideal image average brightness value.
屏幕亮度值確定模組，用於根據外界環境亮度值計算出外界環境光照度值後再按照預先設定之對應關係確定適合外界環境亮度之屏幕亮度值。 The screen brightness value determining module is configured to calculate the ambient light level value according to the ambient environment brightness value, and then determine the screen brightness value suitable for the ambient environment brightness according to the preset correspondence relationship.
屏幕亮度調節模組，根據確定之屏幕亮度值調節顯示屏幕之亮度。 The screen brightness adjustment module adjusts the brightness of the display screen according to the determined brightness value of the screen.
一種屏幕亮度調節方法，該方法包括如下步驟：提供一影像攝取裝置並令其於垂直同步訊號之上升沿到來時攝取外界環境之圖像。 A method for adjusting a brightness of a screen, the method comprising the steps of: providing an image capture device and ingesting an image of an external environment when a rising edge of the vertical sync signal arrives.
判斷所攝取之外界環境圖像之平均亮度值是否在所設定之理想圖像之平均亮度值允許之範圍內。 It is judged whether the average brightness value of the taken outbound environment image is within the allowable range of the average brightness value of the set ideal image.
如果所攝取之外界環境圖像之平均亮度值在該理想圖像之平均亮度值允許之範圍內則將獲得所攝取之外界環境圖像之攝像參數，如光圈值、快門時間和感光度值代入曝光量參數方程式中計算出外界環境亮度值。 If the average brightness value of the ingested environment image is within the allowable range of the average brightness value of the ideal image, the imaging parameters of the taken outbound environment image, such as the aperture value, the shutter time, and the sensitivity value, are obtained. The ambient temperature value is calculated in the exposure parameter equation.
根據外界環境之亮度值計算出外界環境光照度值後再按照預先設定之對應關係確定適合外界環境亮度之屏幕亮度值。 The external ambient illuminance value is calculated according to the brightness value of the external environment, and then the screen brightness value suitable for the external environment brightness is determined according to the preset correspondence relationship.
根據確定之屏幕亮度值調整顯示屏幕之亮度。 Adjust the brightness of the display screen based on the determined screen brightness value.
相對於現有之屏幕亮度調節方法，本發明所提供之屏幕亮度調節系統和方法可根據外界環境亮度之變化自動調節屏幕亮度以獲得較好之視覺效果，從而避免了每次環境變化後都需要通過手動調節來改變屏幕亮度所帶來之不便。 Compared with the existing screen brightness adjustment method, the screen brightness adjustment system and method provided by the invention can automatically adjust the screen brightness according to the change of the brightness of the external environment to obtain a better visual effect, thereby avoiding the need to pass after each environmental change. Manual adjustment to change the brightness of the screen is inconvenient.
請參閱圖1，其為本發明提供之屏幕亮度調節系統2之硬體架構圖。該屏幕亮度調節系統2主要包括顯示屏幕4、對顯示屏幕4之亮度進行調節之亮度調節控制器6、一影像攝取裝置8及一用於協調影像攝取裝置8工作之同步訊號發生器10。 Please refer to FIG. 1 , which is a hardware architecture diagram of a screen brightness adjustment system 2 provided by the present invention. The screen brightness adjustment system 2 mainly includes a display screen 4, a brightness adjustment controller 6 for adjusting the brightness of the display screen 4, an image pickup device 8, and a sync signal generator 10 for coordinating the operation of the image pickup device 8.
該影像攝取裝置8為電荷耦合器件圖像感測器(CCD,Charge Coupled Device)或互補金屬氧化物半導體圖像感測器(CMOS,Complementary Metal Oxide Semiconductor)。該影像攝取裝置8可將外界之光線轉化為與光線強度相對應之數位訊號。 The image capturing device 8 is a charge coupled device image sensor (CCD) or a complementary metal oxide semiconductor image sensor (CMOS, Complementary Metal Oxide Semiconductor). The image capturing device 8 converts the external light into a digital signal corresponding to the light intensity.
該同步訊號發生器10提供週期性為1/30秒之垂直同步訊號。該垂直同步訊號用於協調影像攝取裝置8之工作，於每個垂直同步訊號上升沿到來時影像攝取裝置8進行攝取圖像之動作。在垂直同步訊號之協調作用下影像攝取裝置8每隔1/30秒對外界光線之亮度進行採樣以便於即時地根據外界環境亮度之變化調節顯示屏幕4之亮度。 The sync signal generator 10 provides a vertical sync signal with a periodicity of 1/30 second. The vertical sync signal is used to coordinate the operation of the image pickup device 8, and the image pickup device 8 performs an action of capturing an image when the rising edge of each vertical sync signal comes. Under the coordination of the vertical sync signals, the image pickup device 8 samples the brightness of the external light every 1/30 second to adjust the brightness of the display screen 4 in real time according to the change in the brightness of the external environment.
該亮度調節控制器6包括測光模組12、攝像參數設定模組14、外界環境亮度值計算模組16、屏幕亮度值確定模組18和屏幕亮度調節模組20。本發明所稱之模組是完成特 定功能之電腦程式段。 The brightness adjustment controller 6 includes a photometry module 12, an imaging parameter setting module 14, an ambient brightness value calculation module 16, a screen brightness value determination module 18, and a screen brightness adjustment module 20. The module referred to in the present invention is completed. The computer program segment of the function.
其中，該測光模組12用於計算所攝取圖像之平均亮度值Y並判斷其是否在預先設定於該測光模組中之理想圖像平均亮度值Y1所允許之範圍內，該攝取圖像平均亮度值Y和理想圖像平均亮度值Y1之定義如下：在攝取圖像後，影像攝取裝置8上之每個圖元所對應之亮度值並不相同，把圖像亮度值規格化到0至255之範圍內，以每個亮度值對應之圖元個數所占總圖元個數之比例則可得到所攝取圖像之平均亮度值Y。為權重值對0至255之亮度範圍進行加權運算 The photometric module 12 is configured to calculate an average brightness value Y of the captured image and determine whether it is within a range allowed by an ideal image average brightness value Y1 preset in the photometric module. The average brightness value Y and the ideal image average brightness value Y1 are defined as follows: after the image is taken, the brightness value corresponding to each element on the image capturing device 8 is not the same, and the image brightness value is normalized to 0. In the range of 255, the average luminance value Y of the captured image can be obtained by the ratio of the number of primitives corresponding to each luminance value to the total number of primitives. Weighting the luminance range from 0 to 255 for the weight value
為了達到較好之曝光效果，期望影像攝取裝置8上大多數圖元之亮度值分佈在0至255範圍之中間部分，而亮度值分佈在0和255附近之圖元數量較少，根據這種圖元亮度分佈加權運算可得到理想圖像平均亮度值Y1。各個廠家設定之理想曝光之圖元亮度分佈不完全相同，所計算出來之理想圖像平均亮度值Y1也不完全相同，其變化之範圍為130至140。 In order to achieve a better exposure effect, it is desirable that the luminance values of most of the primitives on the image pickup device 8 are distributed in the middle portion of the range of 0 to 255, and the number of primitives whose luminance values are distributed around 0 and 255 is small, according to this The luminance distribution weighting operation of the primitive can obtain the ideal image average luminance value Y1. The brightness distribution of the ideal exposures set by each manufacturer is not exactly the same, and the calculated average image brightness value Y1 is not exactly the same, and the range of variation is 130 to 140.
該攝像參數設定模組14用於根據該測光模組12之比較結果來設定攝像參數，如光圈值F、快門時間T和感光度值S以使得影像攝取裝置8所攝取圖像之平均亮度值Y在理想圖像平均亮度值Y1所允許之範圍之內。該攝像參數用於在後續步驟中計算出外界環境亮度值。 The camera parameter setting module 14 is configured to set imaging parameters such as the aperture value F , the shutter time T, and the sensitivity value S such that the average brightness value of the image captured by the image capturing device 8 is based on the comparison result of the light metering module 12. Y is within the range allowed by the ideal image average luminance value Y1. The camera parameter is used to calculate the ambient brightness value in a subsequent step.
該外界環境亮度值計算模組16用於把符合理想圖像平均亮度值Y1要求之攝像參數，如光圈值F、快門時間T 和感光度值S代入曝光量參數方程式計算出外界環境亮度值B v 。 The ambient brightness value calculation module 16 is configured to calculate the ambient environment brightness value B by substituting the imaging parameters such as the aperture value F , the shutter time T, and the sensitivity value S that meet the ideal image average brightness value Y1 into the exposure amount parameter equation. v .
該曝光量參數方程式：A V +T V =B V +S V 是根據正確曝光之條件：成像面上點之像面照度等於感光面正確曝光需要之曝光量所建立之經驗方程，是國際通用之自動曝光控制之理論基礎。 The equation of the exposure parameter: A V + T V = B V + S V is based on the conditions of correct exposure: the image illuminance of the image on the imaging surface is equal to the empirical equation established by the exposure required for the correct exposure of the photosensitive surface, and is internationally accepted. The theoretical basis of automatic exposure control.
其中，A V =2log2(F)，F是光圈值；T V =log2(1/T)，T是快門時間；S V =log2(0.3S)，S是感光度值；B V =log2(B/0.3K)，B V 是外界環境亮度值，B是外界環境平均亮度，K是經驗常數。 Where A V = 2log 2 ( F ), F is the aperture value; T V = log 2 (1/ T ), T is the shutter time; S V = log 2 (0.3 S ), S is the sensitivity value; B V =log 2 ( B /0.3 K ), B V is the ambient brightness value, B is the ambient brightness, and K is the empirical constant.
屏幕亮度值確定模組18，用於根據外界環境亮度值B v 計算出外界環境光照度值L v 後再按照預先設定之對應關係以得到合適外界環境亮度之屏幕亮度值L。 Screen brightness value determining module 18, for calculating the ambient light luminance value L v according to the external environment brightness B v and then in a corresponding relationship set in advance to give the appropriate external ambient brightness of the screen brightness value L.
該外界環境亮度值L v 與外界環境光照度值B v 之間之換算公式為：L v =11-log2(B v /33333)。如下表所示，該外界環境光照度值L v 與屏幕亮度值L之間之對應關係由內建表格之方式確定。若所計算出之外界環境光照度值L v 在表格中之兩個L v 值刻度之間則採取四捨五入之方法確定準確之L v 值。 The ambient luminance value L v and the ambient light luminance value between the conversion formula B v is: L v = 11-log 2 (B v / 33333). As shown below, the ambient light luminance value V L and the screen brightness value table of correspondence between the form of L is determined by the built-in manner. If the calculated ambient illuminance value L v is between the two L v scales in the table, the exact L v value is determined by rounding.
請參閱圖2，為本發明提供之屏幕亮度調節方法之流程圖。 Please refer to FIG. 2 , which is a flowchart of a method for adjusting the brightness of a screen provided by the present invention.
步驟S801，攝取圖像，通過一同步訊號發生器10產生一週期為1/30秒之垂直同步訊號，一影像攝取裝置8於垂直同步訊號上升沿到來時攝取一外界環境之圖像。 In step S801, the image is taken, and a vertical sync signal with a period of 1/30 second is generated by a sync signal generator 10. An image pickup device 8 takes an image of the external environment when the rising edge of the vertical sync signal arrives.
步驟S802，判斷圖像平均亮度Y是否合適，對影像攝取裝 置8所攝取圖像之圖元亮度值進行加權運算得到所攝取圖像之平均亮度值Y，判斷所攝取圖像之平均亮度值Y是否在所設定之理想圖像平均亮度值Y1允許之範圍內。 Step S802, determining whether the average brightness Y of the image is appropriate, and loading the image The brightness value of the picture element of the captured image is weighted to obtain the average brightness value Y of the captured image, and it is determined whether the average brightness value Y of the taken image is within the range allowed by the set ideal image average brightness value Y1. Inside.
步驟S803，重新設定攝像參數，如果所攝取圖像之平均亮度值Y不在所設定之理想圖像平均亮度值Y1允許之範圍內，則重新設定影像攝取裝置8之攝像參數並重新攝取新之外界環境圖像。 In step S803, the imaging parameter is reset. If the average brightness value Y of the captured image is not within the range allowed by the set ideal image average brightness value Y1, the imaging parameters of the image capturing device 8 are reset and the new outer boundary is re-acquired. Environmental image.
步驟S804，計算外界環境亮度值B v ，如果所攝取圖像之平均亮度值Y在所設定之理想圖像平均亮度值Y1允許之範圍內則將獲得所攝取圖像之攝像參數，如光圈值F、快門時間T和感光度值S代入曝光量參數方程式中計算出外界環境亮度值B v 。 Step S804, the calculation of the external environment brightness B v, if the average luminance value Y of the image pickup in the set within the range of the image over the average luminance value of the imaging parameters Y1 to allow the captured image will be obtained, such as the aperture value F , the shutter time T and the sensitivity value S are substituted into the exposure amount parameter equation to calculate the ambient brightness value B v .
步驟S805，確定屏幕亮度值L，根據外界環境亮度值B v 計算出外界環境光照度值L v 後再按照預先設定之對應關係確定適合外界環境之屏幕亮度值L。 Step S805, the screen brightness is determined value L, calculates the ambient light luminance value L v according to the external environment brightness B v then set according to the correspondence relationship is determined in advance for the external environment of the screen brightness value L.
步驟S806，調節屏幕亮度，根據該屏幕亮度值L調節屏幕之亮度。 Step S806, adjusting the brightness of the screen, and adjusting the brightness of the screen according to the brightness value L of the screen.
與先前技術相比，本發明提供之屏幕亮度調節系統和方法可根據外界環境亮度之變化自動調節屏幕亮度以獲得較好之視覺效果，從而避免了每次環境變化後都需要通過手動調節來改變屏幕亮度所帶來之不便。 Compared with the prior art, the screen brightness adjustment system and method provided by the invention can automatically adjust the screen brightness according to the change of the brightness of the external environment to obtain a better visual effect, thereby avoiding the need to change by manual adjustment after each environmental change. The inconvenience caused by the brightness of the screen.
綜上所述，本發明確已符合發明專利之要件，遂依法提 出專利申請。惟，以上所述者僅為本發明之較佳實施方式，自不能以此限制本案之申請專利範圍。舉凡熟悉本案技藝之人士援依本發明之精神所作之等效修飾或變化，皆應涵蓋於以下申請專利範圍內。 In summary, the present invention has indeed met the requirements of the invention patent, and Patent application. However, the above description is only a preferred embodiment of the present invention, and it is not possible to limit the scope of the patent application of the present invention. Equivalent modifications or variations made by persons skilled in the art in light of the spirit of the invention are intended to be included within the scope of the following claims.
2‧‧‧屏幕亮度調節系統 2‧‧‧Screen brightness adjustment system
4‧‧‧顯示屏幕 4‧‧‧ display screen
6‧‧‧亮度調節控制器 6‧‧‧Brightness adjustment controller
8‧‧‧影像攝取裝置 8‧‧‧Image capture device
10‧‧‧同步訊號發生器 10‧‧‧Synchronous signal generator
12‧‧‧測光模組 12‧‧‧Lighting module
14‧‧‧攝像參數設定模組 14‧‧‧ Camera parameter setting module
16‧‧‧外界環境亮度值計算模組 16‧‧‧Environmental environment brightness value calculation module
18‧‧‧屏幕亮度值確定模組 18‧‧‧Screen brightness value determination module
20‧‧‧屏幕亮度調節模組 20‧‧‧Screen brightness adjustment module
圖1係本發明提供之屏幕亮度調節系統之硬體架構圖。 1 is a hardware architecture diagram of a screen brightness adjustment system provided by the present invention.
圖2係本發明提供之屏幕亮度調節方法之流程圖。 2 is a flow chart of a screen brightness adjustment method provided by the present invention.
2‧‧‧屏幕亮度調節系統 2‧‧‧Screen brightness adjustment system
4‧‧‧顯示屏幕 4‧‧‧ display screen
6‧‧‧亮度調節控制器 6‧‧‧Brightness adjustment controller
8‧‧‧影像攝取裝置 8‧‧‧Image capture device
10‧‧‧同步訊號發生器 10‧‧‧Synchronous signal generator
12‧‧‧測光模組 12‧‧‧Lighting module
14‧‧‧攝像參數設定模組 14‧‧‧ Camera parameter setting module
16‧‧‧外界環境亮度值計算模組 16‧‧‧Environmental environment brightness value calculation module
18‧‧‧屏幕亮度值確定模組 18‧‧‧Screen brightness value determination module
20‧‧‧屏幕亮度調節模組 20‧‧‧Screen brightness adjustment module
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