1288293 九、發明說明： 【發明所屬之技術領域】 本發明係有關於一種數位攝影裝置之自動曝 法’尤其是指一種配合加權值（Weighting)的控制，可隨 易改變曝光策略，俾使曝光值的預測更精準、計算量更 少、速度更快之數位攝影裝置之自動曝光方法。 【先前技術】 按’在數位攝影裝置裡我們使用光圈（Iris)來調節數 . 位攝影裝置的進光量，已令所呈現之影像不致因曝光過度 而產生一片白茫茫的狀態或因曝光不足而形成一片漆零 之狀態；而除了調節光圈以外，我們還可以改變感測器的 感光值（ISO)及調整曝光時間（Exposure time)以得到適光 的進光量。 由於控制曝光的變因相當多（光圈（Iris)、感光值 (ISO)、曝光時間（Exposure time)等），使在多變因的自 動曝光演鼻法變得非常複雜，而自動曝光演算法若過於複 雜，會使自動曝光演算法難以發展，並造成難以維護及不 > 易商品化之缺失。 【發明内容】 有鑑於此，本發明提供一種數位攝影裝置之自動曝光 方法，該自動曝光方法係配合加權值（Weighting)的控 制，使之可隨易改變曝光策略，且當使用者將其中一個以 上變因設為手動時，本發明之自動曝光方法仍可依加權值 (Weighting)自行計算出新的曝光策略，以得到適當的曝 光量；另，在預測函數方面，使用表格查詢的方式取代複 雜的計算，表格的取得是依數位攝影裝置特性曲線測量得 1288293 到，此種方式將比使用數學式計算得到的預測更精準、計 算量更少、速度更快。 而為達成上述目的，本發明之數位攝影裝置之自動曝 先方法是由以下步驟實現： (A)根據此數位攝影裝置之特性曲線建立預測表格，並 以目前亮度值為參考值，查取距離目標亮度之所需 修正步階數； (β)依曝光值（Exposure Value，簡稱EV)建立曝光時 間表格及定義各曝光時間之加權值（Weighting); (C) 依曝光值建立感光值表格及定義各感光值之加權值 (Weighting)； (D) 依曝光值建立光圈表格及定義各光圈之加權值 (Weighting)； (E) 從曝光時間表格、感光表格、光圈表格中各選擇一 數值做為初始化設定，並計算曝光值； (F) 經由此數位攝影裝置中的感測器擷取一影像，並且 統計影像之亮度； (G) 將統計影像之亮度輸入（A)步驟所建立的預測表格， 得到距離目標亮度之所需修正步階數； ⑴當距離目標亮度之所需修正步階數為收斂時表示完 成自動曝光，並以此曝光值為當時環境下最佳曝光 值。 另外’ S距離目標免度之所需修正步階數為不 收斂時，則繼續執行以下步驟： ⑴將之前之曝光值加距離目標亮度之所需修正步階數 為新的曝光值； 6 1288293 (J) 依新的曝光值換算曝光時間（Exposure time)、感光 (ISO)、光圈（Iris)，並計算總加權值（Weighting simmation)，同一曝光值可能有多組不同設定可達 成，此時由總加權值（Weighting summation)判斷出 最佳的設定，並將最佳的曝光時間（Exp〇sure time)、感光（ISO)、光圈（iris)設定到數位攝影裝 置中，若曝光變因中，有一項以上的變因設定為手 動，則該變因固定不動； (K) 依（J)的設定經由此數位攝影裝置中的感測器擷取 一影像，並且統計影像之亮度； (L) 重覆（G)〜（K)’直到自動曝光收斂為止。 【實施方式】 而為令本發明之技術手段、創作目的及其達成功效能 夠有更完整、清楚的揭露，茲於下詳細說明之，並請一併 參閱所附之圖式及圖號。 請參閱第一圖所示’本發明之數位攝影裝置之自動曝 光方法包括以下步驟： (A) 根據此數位攝影裝置之特性建立預測表格，並以目 前责度值為參考值’查取距離目標亮度之所需修正 步階數；假設此數位攝影裝置之影像亮度規格化到 0〜255，則可由此數位攝影裝置特性建立如第二圖所 不之預測表格’於該預測表格中所需修正步階數為 零，即為表示自動曝光己收斂，故在第二圖所示的 預測表格中其亮度之收斂區間為影像亮度介於97 101 ; (B) 依曝光值建立曝光時間表格及定義各曝光時間之加 7 1288293 權值（Weighting)，如第三圖所示即為依假設之數位 攝影裝置的可用曝光時間（Exposure time)所建立 之曝光時間表格；其中， 曝光值 EV=—Log2 (Exposure time); (C)依曝光值建立感光值表格及定義各感光值之加權值 (Weighting)，如第四圖所示即為依假設之數位攝影 裝置的可用感光值（ISO)所建立之感光值表格；其 中， ~ 曝光值 EV= — Log2 ( ISO/100); (D) 依曝光值建立光圈表格及定義各光圈之加權值 (Weighting)，如第五圖所示即為依假設之數位攝影 裝置可用的光圈（Iris)所建立之光圈表格；其中， 曝光值 EV=2Log2 ( Iris); (E) 從曝光時間表格、感光表格、光圈表格中各選擇一 數值做為初始化設定，並計算目前之曝光值； (F) 經由此數位攝影裝置中的感測器擷取一影像，並且 統計影像之亮度； (G) 將統计影像之亮度輸入（A)步驟所建立的預測表格， 得到距離目標亮度之所需修正步階數； (H) 當距離目標亮度之所需修正步階數為零時表示自動 曝光收斂而完成自動曝光，並以此曝光值為當時環 境下最佳曝光值。 < 另外，當距離目標亮度之所需修正步階數不為 零時，則繼續執行以下步驟·· # (I)將之刖曝光值加距離目 新的曝光值； 標亮度之所需修正步階數為 1288293 (J) 依新的曝光值換算曝光時間（Exposure time)、感 光值（ISO )、光圈（Iris)，並計算總加權值 (Weighting summation)，同一曝光值可能有多組不 同設定可達成，此時由總加權值（Weighting summation)判斷出最佳的設定，並將最佳的曝光時 間（Exposure time)、感光值（ISO)、光圈（Iris) 設定到數位攝影裝置中，若曝光變因中，有一項以 上的變因設定為手動，則該變因固定不動； (K) 依（J)的設定統計影像之亮度； (L) 重覆（G)〜（K)，直到自動曝光收斂為止。 為證明本發明綠實能達到所預期之目的，特於 下列舉實施例說明之： 【實施例一】 在全自動模式情形下： 首先，需進行初始化之設定，令 初使之EV=3及之前的EV=3， 曝光時間（Exposure time) :1/16，感光值（iso): 1600，光圈（Iris) : 2· 8， 並將所設定之曝光時間（Exposure time)、感光值 (ISO)、光圈（Iris)三個參數設定到數位攝影裝置中， 剛剛所設定的參數反應到感測器中，擷取一張影像並統 計影像之亮度為149 則由第一圖預測表格中以亮度為149為輸入查得距離 目摞亮度之所需修正步階數（Pridect EV Step)為8 新的EV=之前的EV+距離目標亮度之所需修正步階 9 1288293 數0 EV = Previ ousEV + 8 = 3 + 8= U，新的 EV 取代之前的 EV，使之前的EV為11 繼由第三圖曝光時間表格、第四圖感光值表格、第五 圖光圈表格查4得知以其各表格中之相加後EV=n 的情形有以下組合 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 111288293 IX. Description of the Invention: [Technical Field] The present invention relates to an automatic exposure method of a digital photographic device, in particular to a control with weighting, which can easily change the exposure strategy and cause exposure An automatic exposure method for digital photographic devices with more accurate, less computationally intensive, and faster calculations. [Prior Art] According to 'In digital photography equipment, we use the iris (Iris) to adjust the amount of light entering the digital camera. This has caused the image to be displayed without being overexposed to a white state or due to insufficient exposure. Forming a state of lacquer zero; in addition to adjusting the aperture, we can also change the sensor's sensitization value (ISO) and adjust the exposure time (Exposure time) to get the amount of light. Due to the considerable variation in the control exposure (Iris, ISO, Exposure time, etc.), the automatic exposure of the multi-variable automatic nose method becomes very complicated, and the automatic exposure algorithm If it is too complicated, it will make the automatic exposure algorithm difficult to develop, and it will be difficult to maintain and not easy to commercialize. SUMMARY OF THE INVENTION In view of this, the present invention provides an automatic exposure method for a digital photographing apparatus, which is matched with weighting control so that the exposure strategy can be easily changed, and when the user puts one of them When the above variation is set to manual, the automatic exposure method of the present invention can still calculate a new exposure strategy according to the weighting value to obtain an appropriate exposure amount; and, in terms of the prediction function, use a table query instead. For complex calculations, the table is obtained by measuring 1288293 according to the digital camera's characteristic curve. This method will be more accurate, less computationally intensive and faster than the mathematically calculated prediction. To achieve the above object, the automatic exposure method of the digital camera of the present invention is implemented by the following steps: (A) establishing a prediction table according to the characteristic curve of the digital camera, and using the current brightness value as a reference value to check the distance The required correction step number of the target brightness; (β) establishes an exposure time table according to the Exposure Value (EV) and defines a weighting value (Weighting) of each exposure time; (C) establishes a photosensitive value table according to the exposure value and Define the weighting value of each photosensitive value (Weighting); (D) Establish the aperture table according to the exposure value and define the weighting value of each aperture (Weighting); (E) Select a value from each of the exposure time table, the sensitization table, and the aperture table. To initialize the settings and calculate the exposure value; (F) capture an image from the sensor in the digital camera and count the brightness of the image; (G) enter the prediction of the brightness of the statistical image (A) The table obtains the required number of correction steps from the target brightness; (1) when the required correction step number from the target brightness is converged, indicating that the automatic exposure is completed, and the exposure value is used The best exposure value for the environment at the time. In addition, when the required correction step number of the target distance exemption is not convergent, the following steps are continued: (1) The required exposure step number of the previous exposure value plus the distance target brightness is the new exposure value; 6 1288293 (J) Convert exposure time (Exposure time), sensitization (ISO), aperture (Iris) according to the new exposure value, and calculate the total weighting value (Weighting simmation). The same exposure value may have multiple sets of different settings. The optimal setting is determined by the weighting summation, and the optimal exposure time (Exp〇sure time), sensitization (ISO), and iris (iris) are set to the digital photographic device. If more than one variable is set to manual, the variable is fixed; (K) according to the setting of (J), an image is captured by the sensor in the digital camera, and the brightness of the image is counted; ) Repeat (G) ~ (K) ' until the auto exposure converges. [Embodiment] For a more complete and clear disclosure of the technical means, the purpose of creation and the success of the present invention, the following is a detailed description, and please refer to the attached drawings and drawings. Referring to the first figure, the automatic exposure method of the digital camera of the present invention comprises the following steps: (A) establishing a prediction table according to the characteristics of the digital camera, and using the current duty value as a reference value to check the distance target The required correction step number of brightness; assuming that the image brightness of the digital camera device is normalized to 0 to 255, the digital camera device characteristics can be established as shown in the second figure. If the number of steps is zero, it means that the automatic exposure has converged, so the convergence range of the brightness in the prediction table shown in the second figure is the image brightness is 97 101; (B) The exposure time table and definition are established according to the exposure value. Adding 7 1288293 weighting time for each exposure time, as shown in the third figure, is the exposure time table established by the available exposure time of the digital camera; the exposure value EV=—Log2 (Exposure time); (C) establish a sensitization value table according to the exposure value and define a weighting value of each sensitized value, as shown in the fourth figure, which is a hypothetical digital photographic device A table of sensitization values established by the sensitization value (ISO); where, ~ exposure value EV = - Log2 (ISO/100); (D) The aperture table is established according to the exposure value and the weighting value (Weighting) of each aperture is defined, such as The five figures show the aperture table created by the aperture (Iris) available to the hypothetical digital camera; where the exposure value is EV=2Log2 ( Iris); (E) from the exposure time table, the sensitization table, and the aperture table Select a value as the initial setting and calculate the current exposure value; (F) capture an image from the sensor in the digital camera and count the brightness of the image; (G) input the brightness of the statistical image ( A) The prediction table created by the step obtains the required correction step number from the target brightness; (H) When the required correction step number from the target brightness is zero, the automatic exposure converges and the automatic exposure is completed, and The exposure value is the optimum exposure value in the current environment. < In addition, when the required correction step number from the target brightness is not zero, the following steps are continued: # (I) Adding the exposure value to the new exposure value; The number of steps is 1284293 (J) The exposure time (Exposure time), the sensitization value (ISO), the aperture (Iris), and the weighting summation are calculated according to the new exposure value. The same exposure value may have different sets. The setting can be achieved. At this time, the optimal setting is determined by the weighting summation, and the optimal exposure time, the sensitivity value (ISO), and the aperture (Iris) are set to the digital camera. If one or more of the exposure factors are set to manual, the cause is fixed; (K) The brightness of the image is counted according to the setting of (J); (L) Repeat (G) ~ (K), Until the automatic exposure converges. In order to prove that the present invention can achieve the intended purpose, the following examples are described: [Embodiment 1] In the case of the fully automatic mode: First, the initialization setting is required to make the initial EV=3 and Previous EV=3, Exposure time: 1/16, sensitization value (iso): 1600, aperture (Iris): 2· 8, and the set exposure time (Exposure time), sensitization value (ISO ), Iris three parameters are set to the digital camera, the parameters just set are reflected in the sensor, capture an image and the brightness of the image is 149. The required correction step number (Pridect EV Step) for 149 is the input distance of the target brightness is 8 new EV = the previous EV + distance correction target required for the target brightness 9 1288293 number 0 EV = Previ ousEV + 8 = 3 + 8= U, the new EV replaces the previous EV, so that the previous EV is 11 followed by the third chart exposure time table, the fourth picture photosensitive value table, the fifth picture aperture table check 4 The case where EV=n is added in the following combination 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11
Exposure Time 1/16 1/32 1/32 1/64 1/64 1/64 1/128 1/128 1/128 1/128 1/256 1/256 1/256 1/256 1/256 1/512 1/512 1/512 1/512 1/1024 1/1024 1/1024Exposure Time 1/16 1/32 1/32 1/64 1/64 1/64 1/128 1/128 1/128 1/128 1/256 1/256 1/256 1/256 1/256 1/512 1/512 1/512 1/512 1/1024 1/1024 1/1024
Malting of Exposure tine 0 1 6 11 11 11 11 11 12 12 12 12 15 15 15 100 200 100 400 200 100 800 400 200 100 1600 800 400 200 100 1600 800 400 200 1600 800 400 WEIGHTING Iris Weighting Weighting OF ISO of Iris summation 2 11 16 18 3 11 16 20 2 8 14 17(最小值） 4 11 16 25 3 8 14 22 2 5.6 13 20 7 11 16 29 4 8 14 24 3 5.6 13 22 2 4 10 18 8 11 16 35 7 8 14 32 4 5· 6 13 28 3 4 10 24 2 2.8 9 22 8 8 14 34 7 5.6 13 32 4 4 10 26 3 2.8 9 24 8 5.6 13 36 7 4 10 32 4 2.8 9 28 10 1288293 選取Weighting summation最小值（設定最小值為最 佳狀態）’可传 EV= 11 最佳的 Exposure time=l/32， IS(M〇〇，Iris=8，再將以上所得到之曝光時間（Exp〇sure Time)、感光值（ISO)、光圈（iris)三個參數設定到數 位攝影裝置中，經由感測器擷取一張影像並統計影像之亮 度為Y=91 以免度為91為輸入查得距離目標亮度之所需修正步 階數為一 2 新的EV =之前的EV+距離目標亮度之所需修正步階 數， EV=PreviousEV — 2= 11 — 2=9，繼由第三圖曝光時間 表格、第四圖感光表格、第五圖光圈表格查詢得知以其各 表格中之EV值相加後EV= 9的情形有以下組合 EV Exposure Ifeigjitirgof ISO Weighting Iris Weighting Weighting time E?®osure tine of ISO of Iris summation 9 1/16 0 400 4 11 16 20 9 1/16 0 200 3 8 14 17 9 1/16 0 100 2 5.6 13 15 9 1/32 1 800 7 11 16 24 9 1/32 1 800 4 8 14 19 9 1/32 1 200 3 5.6 13 17 9 1/32 1 100 2 4 10 13(最小值） 9 1/64 5 1600 8 11 16 29 9 1/64 5 800 7 8 14 26 9 1/64 5 800 4 5.6 13 __—11 11 1288293 EV Exposure fei^itiigof ISO Weighting Iris Weighting Weighting time Bqposune time of ISO of Iris summation 9 1/64 5 200 3 4 10 18 9 1/64 5 100 2 2.8 9 16 9 1/128 6 1600 8 8 14 28 9 1/128 6 800 7 5.6 13 26 9 1/128 6 400 4 4 10 20 9 1/128 6 200 3 2· 8 9 18 9 1/256 11 1600 8 5· 6 13 32 9 1/256 11 800 7 4 10 28 9 1/256 11 400 4 2.8 9 24 9 1/512 12 1600 8 4 10 30 9 1/512 12 800 7 2.8 9 28 9 1/1024 15 1600 8 2.8 9 32Malting of Exposure tine 0 1 6 11 11 11 11 11 12 12 12 12 15 15 15 100 200 100 400 200 100 800 400 200 100 1600 800 400 200 100 1600 800 400 200 1600 800 400 WEIGHTING Iris Weighting Weighting OF ISO of Iris summation 2 11 16 18 3 11 16 20 2 8 14 17 (minimum) 4 11 16 25 3 8 14 22 2 5.6 13 20 7 11 16 29 4 8 14 24 3 5.6 13 22 2 4 10 18 8 11 16 35 7 8 14 32 4 5· 6 13 28 3 4 10 24 2 2.8 9 22 8 8 14 34 7 5.6 13 32 4 4 10 26 3 2.8 9 24 8 5.6 13 36 7 4 10 32 4 2.8 9 28 10 1288293 Choose Weighting summation minimum Value (set the minimum value to the best state) 'Transfer EV= 11 Best Exposure time=l/32, IS(M〇〇, Iris=8, then the exposure time obtained above (Exp〇sure Time) The three values of the sensitization value (ISO) and the iris (iris) are set to the digital photographic device, and an image is captured through the sensor and the brightness of the image is calculated as Y=91 to avoid the degree of 91 as the input to find the target brightness. The required number of correction steps is one 2 new EV = the number of correction steps required for the previous EV+ distance target brightness, EV=PreviousEV — 2= 11 — 2=9, followed by the third chart exposure time table, the fourth picture sensitization table, and the fifth picture aperture table query to find that the EV values in each table are added and EV=9 The situation has the following combination: EV Exposure Ifeigjitirgof ISO Weighting Iris Weighting Weighting time E?®osure tine of ISO of Iris summation 9 1/16 0 400 4 11 16 20 9 1/16 0 200 3 8 14 17 9 1/16 0 100 2 5.6 13 15 9 1/32 1 800 7 11 16 24 9 1/32 1 800 4 8 14 19 9 1/32 1 200 3 5.6 13 17 9 1/32 1 100 2 4 10 13 (minimum) 9 1/ 64 5 1600 8 11 16 29 9 1/64 5 800 7 8 14 26 9 1/64 5 800 4 5.6 13 __—11 11 1288293 EV Exposure fei^itiigof ISO Weighting Iris Weighting Weighting time Bqposune time of ISO of Iris summation 9 1/64 5 200 3 4 10 18 9 1/64 5 100 2 2.8 9 16 9 1/128 6 1600 8 8 14 28 9 1/128 6 800 7 5.6 13 26 9 1/128 6 400 4 4 10 20 9 1/128 6 200 3 2· 8 9 18 9 1/256 11 1600 8 5· 6 13 32 9 1/256 11 800 7 4 10 28 9 1/256 11 400 4 2.8 9 24 9 1/512 12 1600 8 4 10 30 9 1/512 12 800 7 2.8 9 28 9 1/102 4 15 1600 8 2.8 9 32
選取Weighting summation最小值（設定最小值為最 佳狀態），可得 EV=9 時，Exposure time=l/32，IS0=1 〇〇， Iris= 4為最佳設定，再將以上所得到之曝光時間 (Exposure time)、感光值（ISO)、光圈（IRIS)三個 數值輸入數位攝影裝置中，經由感測器擷取一張影像並統 計影像之亮度為Y=99。 以亮度為99為輸入查得距離目標亮度之所需修正步 階數為0，0表示自動曝光己收斂。 【實施例二】 當使用者將光圈（Iris)定為手動，並設定在5· 6的 狀態下： 12 1288293 首先’需進行初始化之設定，令 初使之EV=5及之前的EV=5， 曝光時間（Exposure time) : 1/16，感光值（ISO): 1600’光圈（Iris): 5. 6,並將所設定之曝光時間（Exposure time)、感光值（ISO)、光圈（Iris)三個參數設定到 數位攝影裝置中，剛剛所設定的參數反應到感測器中，擷 取一張影像並統計影像之亮度為134 則由第一圖預測表格中以亮度為134為輸入查得距離 目標亮度之所需修正步階數為6 EV = previ〇usEv+6=：5+6=ll，繼由第三圖曝光時 間表格、第四圖感光值表格、第五圖光圈表格查詢得知以 其^表格中之EV值相加德EV=11有以下組合 EV Exposu re time Weighting of Exposure time ISO Weightin g of ISO Iris Weightin g of Iris Weighting summation 11 1/64 5 100 2 5.6 13 20(最小值） 11 1/128 6 200 3 5.6 13 22 11 1/256 11 400 4 5.6 13 28 11 1/512 12 800 7 5.6 13 32 11 1/1024 15 1600 8 5.6 13 36 選取Weighting summation最小值（設定最小值為 最佳狀態），可得EV= 11最佳的Exposure time=l/64， ISO=100，Iris=5· 6，再將以上所得到之曝光時間 (Exposure time)、感光值（ISO)、光圈（Iris)三 13 1288293 個數值輸入數位攝影裝置中，經由感測器擷取一張影像 並統計影像之亮度為Y=105 以亮度為105為輸入查得距離目標亮度之所需修正步 階數為1 新的EV =之前的EV+距離目標亮度之所需修正步階 數， EV=PreviousEV+l = ll + l = 12，繼由第三圖曝光時間 表格、第四圖感光值表格、第五圖光圈表格查詢得知以其 各表格中之EV值相加後EV= 12的情形有以下組合 EV Exposu lfei^iting of ISO Weighting Iris Weighting Weighting re time Exjpogjce time of ISO of Iris summation 12 1/128 6 100 2 5. 6 13 21(最小值） 12 1/256 11 200 3 5.6 13 27 12 1/512 12 400 4 5.6 13 29 12 1/1024 15 800 7 5· 6 13 35 可得 EV = 12 最佳的 Exposure time=l/128，ISO=l00，Select Weighting summation minimum value (set the minimum value to the best state), when EV=9, Exposure time=l/32, IS0=1 〇〇, Iris= 4 is the best setting, then the above exposure is obtained. Time (Exposure time), sensitization value (ISO), and aperture (IRIS) are input into the digital camera. The image is captured by the sensor and the brightness of the image is Y=99. The required correction step number for finding the distance from the target brightness with the brightness of 99 as the input is 0, and 0 means that the automatic exposure has converged. [Embodiment 2] When the user sets the iris (Iris) to manual and sets it to the state of 5·6: 12 1288293 First, the initial setting is required, so that the initial EV=5 and the previous EV=5 Exposure time: 1/16, sensitization value (ISO): 1600' aperture (Iris): 5. 6, and set the exposure time (Exposure time), sensitization value (ISO), aperture (Iris The three parameters are set to the digital camera. The parameter just set is reflected in the sensor, and an image is captured and the brightness of the image is 134. The brightness is 134 as input from the first chart prediction table. The required correction step from the target brightness is 6 EV = previ〇usEv+6=:5+6=11, followed by the third exposure time table, the fourth picture sensitivity table, and the fifth picture aperture table query. It is known that the EV value in the table is EV=11 and has the following combination: EV Exposu re time Weighting of Exposure time ISO Weightin g of ISO Iris Weightin g of Iris Weighting summation 11 1/64 5 100 2 5.6 13 20( Minimum) 11 1/128 6 200 3 5.6 13 22 11 1/256 11 400 4 5.6 13 28 11 1/512 12 800 7 5.6 13 32 11 1/1024 15 1600 8 5.6 13 36 Selecting the Weighting summation minimum value (set the minimum value to the best state), you can get EV= 11 best Exposure time=l/64, ISO =100, Iris=5·6, and then input the exposure time (Exposure time), the sensitization value (ISO), and the aperture (Iris) three 13 1288293 values into the digital camera, and take a sensor through the sensor. The image and the brightness of the image are Y=105. The required correction step number for the target brightness is 1 with the brightness of 105. The new EV = the previous EV+ distance correction target, the required correction step, EV =PreviousEV+l = ll + l = 12, following the third picture exposure time table, the fourth picture sensation value table, the fifth picture aperture table query, it is found that the EV value in each table is added and EV=12 The situation has the following combination: EV Exposu lfei^iting of ISO Weighting Iris Weighting Weighting re time Exjpogjce time of ISO of Iris summation 12 1/128 6 100 2 5. 6 13 21 (minimum) 12 1/256 11 200 3 5.6 13 27 12 1/512 12 400 4 5.6 13 29 12 1/1024 15 800 7 5· 6 13 35 EV = 12 best Exposure time = l / 128, ISO = l00,
Iris=5· 6 ’再將以上所得到之曝光時間（Exposure time )、 感光值（ISO)、光圈（Iris)三個數值輸入數位攝影裝 置中，經由感測器擷取一張影像並統計影像之亮度為Y = 101 以亮度為101為輸入查得距離目標亮度之所需修正步 Ρ白數為0，0表不自動曝光己收敛。 此外’上述之預測表格、曝光時間表格、感光值表格、 光圈表格係由陣列表格或程式碼實現。 經由以上之說明，可知本發明具有下列幾項優點，如： 14 1288293 ι·由於該預測表格是依據數位攝影裝置的特性所設計，所 以預測準確度極高。 2·由於本發明是採用表格查詢取代傳統以數學計算方式 得到所需要的參數，因此可大幅降低運算量，縮短處理 時間’降低系統消耗功率，預測更精準。 3·此外，本發明可依加權值（Weighting)自行計算曝光策 略，且該曝光策略可以使用加權值（Weighting)輕易改 .人’备各曝光變因中其中一項以上的變因改為手動時， 乃^依加權值（Weighting)自行計算出新的曝光策略。 限定=發:何已:習較::::揭在露於上，然其並非用以 以申請專叫㈣之保護範圍 效，所韻之使用功 亦未曾公開於構造，不僅未曾見諸於同類產品中， 求，麦依法提出發^專全符/專利法之規定與要 專利，則實感德：申❺’懇請惠予審查，並賜准 15 1288293 【圖式簡單說明】 第一圖：本發明之步驟流程圖 第二圖：本發明根據數位攝影裝置之特性所建立之預測表格 第三圖：本發明根據數位攝影裝置之特性所建立之曝光時間 表格 第四圖：本發明根據數位攝影裝置之特性所建立之感光表格 第五圖：本發明根據數位攝影裝置之特性所建立之光圈表格 16Iris=5· 6 'Enter the three values of Exposure time, ISO and Iris, and input them into the digital camera. The brightness is Y = 101. The brightness of 101 is the input. The required correction step white is 0, and the 0 table does not automatically converge. In addition, the above prediction table, exposure time table, sensitization value table, and aperture table are implemented by an array table or a code. From the above description, it can be seen that the present invention has the following advantages, such as: 14 1288293 ι· Since the prediction table is designed according to the characteristics of the digital photographic device, the prediction accuracy is extremely high. 2. Since the present invention replaces the conventional mathematically calculated parameters by using a table query, the amount of calculation can be greatly reduced, and the processing time can be reduced to reduce the system power consumption and the prediction is more accurate. 3. In addition, the present invention can calculate the exposure strategy by weighting, and the exposure strategy can be easily changed by weighting. The person's change of one or more of the exposure factors is changed to manual. At the time, the new exposure strategy is calculated by weighting. Qualification = hair: He has: Xi:::: revealed in the above, but it is not used to apply for special protection (4) protection scope, the use of rhyme has not been disclosed in the structure, not only has not been seen in Among the similar products, the request, the law according to the law to issue the full-featured / patent law provisions and patents, the real sense of Germany: Shen Yi's request for review, and grant 15 1288293 [simple description of the map] First: Step 2 of the flow chart of the present invention: Predictive table established according to the characteristics of the digital photographic apparatus of the present invention. Third figure: The exposure time table established by the present invention according to the characteristics of the digital photographic apparatus. Fourth figure: The present invention is based on digital photography. Photosensitive Table Created by Characteristics of the Device Fifth Figure: Aperture Table 16 Established According to the Characteristics of Digital Photographic Apparatus of the Present Invention