200906175 九、發明說明： 【發明所屬之技術領域】 本發明關於調整攝取影像品質之調整裝置，尤其係 關於一種調整攝像裝置感光度之感光度調整裝置及調整 方法。 【先前技術】 隨著科技之不斷發展，攜帶式電子裝置如移動電 話，應用日益廣泛，同時也日漸趨向於輕巧、美觀及多 功能化，其中照相功能係近年流行之移動電話之附加功 能。應用於移動電話之數位相機模組不僅要滿足輕薄短 小之要求，其還須具有較高之照相性能。感光度之選取 範圍係影響相機模組之照相品質之重要參數之一，因 此，對感光度之調整有利於所獲取影像亮度及照相品質 之提高。 感光度（Sensitivity )係指根據光源之不同強度相機 之感光能力。在數位相機中，感光度之調整係通過調整 由影像感測器所獲取之像素值來完成之。當放大該影像 感測器所獲取之像素值，則提高了感光度，相反，則為 降低了感光度。 通常感光度之調整係通過調整控制影像感測器本 身之放大器以將其所採集來之訊號進行放大或縮小，從 而調整影像感測器之感光度以及所獲取影像之亮度。但 是上述方法會受限於放大器本身之設計，而且對其所採 集之訊號進行放大之過程中，訊號中會摻雜入噪音，而 7 200906175 降低了影像之品質。 【發明内容】 有鐾於此，有必要提供一種能減少影像訊號之°桑音且 調整感光度之感光度調整裝置及調整方法。 一種感光度調整裝置，其包括一存儲單元，用於存儲 預先設定之複數像素值調整對應表，每個像素值調整對 應表具有一輸入值域以及一與該輸入值域一一對應之輸 出值域；一影像獲取單元，用於獲取影像並取得該影像 各像素點之像素值，並確定各像素值所組成之範圍；一 比較單元，用於將影像獲取單元獲取之像素值範圍與存 儲單元内存儲之各像素值調整對應表之輸入值域比較， 並確定輸入值域；一調整單元，用於根據所確定之輸入 值域所對應之像素值調整對應表將獲取影像之像素值進 行調整，並輸出調整後之像素值以調整感光度。 一種感光度調整方法，其包括下列步驟： 從待調整影像上獲取該影像各像素點之像素值，並確 定該像素值所組成之範圍； 將像素值範圍與複數像素值調整對應表之各輸入值 域比較，並確定一輸入值域；及 根據所確定之輸入值域對應之像素值調整對應表將 獲取影像之像素值進行調整，並輸出調整後之像素值以 調整感光度。 上述感光度調整裝置及調整方法可根據所獲取之影 像之像素值動態地選擇像素值調整對應表以調整攝影裝 8 200906175 置之感光度，不僅突破了放大器本身之限制，而且還減 少了因感光度調整而使放大器產生之雜訊號。 【實施方式】 下面將結合附圖，對本發明作進一步之詳細說明。 請參閱圖1，其為本發明實施例之所提供之感光度 調整裝置之功能結構。該感光度調整裝置設置於攝像裝 置中，如數位相機、具有拍攝功能之移動電話以及個人 數位處理等，在本實施例中所述攝像裝置為數位相機。 該感光度調整裝置包括存儲單元Π、影像獲取單元12、 比較單元13、調整單元14。 所述存儲單元11用於存儲預先設定之複數像素值 調整對應表。當然可以想到的是，該存儲單元11還可以 存儲其他數據，如影像，文字等諸如此類。 如圖2及圖3所示，該像素值調整對應表為影像之 像素值調整對應表，其所對應之曲線即為伽馬曲線 (Gamma曲線），通過該像素值調整對應表之作用，配合 所述感光度調整裝置中各單元模組之作用，可對影像之 像素值進行放大或縮小，從而可以增大或減小數位相機 之感光度。該像素值調整對應表可以有複數個，但其中 每個像素值調整對應表之輸入值域與輸出值域係——對 應的，且每個像素值調整對應表之輸入值域之範圍係不 同的，其輸出值域可以相同也可以不同。在本實施例中， 僅提供二個像素值調整對應表Ilia、111b及其所對應之 Gamma曲線作為示例。在該實施例中，所述像素值調整 9 200906175 對應表Ulb之輸入值域為像素值調整對應表Ilia之一 半，且它們之輸出值域是相同的，都為0〜255。所述像 素值調整對應表111a之輸入值域0〜255，所述像素值調 整對應表111b之輸入值域0〜127。可以理解的是，像素 值調整對應表111a之輸入值域與像素值調整對應表111b 之輸入值域之比例可以任意’如三分之一、四分之一或 其他。當然，其輸出值域也可以不同。在本實施例中， 僅為說明感光度調整裝置及其調整方法，舉如上兩個例 子，在感光度調整過程中，選取其中一個來調整數碼相 機之感光度。 所述影像獲取單元12用於獲取影像並取得該影像 各像素點之像素值，並確定該像素值所組成之範圍。該 影像獲取單元12為影像感測晶片。 所述比較單元13用於將影像獲取單元獲取之像素 值範圍與存儲單元之各像素值調整對應表，如Ilia、111b 之輸入值域比較，並確定一適於該像素值所組成之範圍 之輸入值域。 所述調整單元14用於根據所確定之輸入值域所對 應之像素值調整對應表111a或111b將獲取影像之像素 值進行調整，並輸出調整後之像素值以調整感光度。如 果調整後之像素值與調整前之像素值相比，調整後之像 素值被增大時，則該感光度被提高了，若調整後之像素 值被縮小，則該感光度被降低了。 可以想到的是，為了擴展像素值調整對應表之數 10 200906175 據，該感光度調整裝置還可以包括一用於初始化設置像 素值調整對應表之輸入值域之初始化設置單元15，其可 以隨時對該像素值調整對應表進行調整。 下面將對本實施例所提供之感光度調整裝置之調整 方法進行詳細說明，如圖4所示，為本發明所提供之感 光度調整方法之流程圖。 首先，步驟S201，初始化設置像素值調整對應表； 步驟S202，從待調整影像上獲取該影像各像素點之 像素值，並確定該像素值所組成之範圍； 步驟S203，將像素值範圍與各像素值調整對應表 111a、111b之輸入值域比較，並確定一輸入值域； 步驟S204，根據所確定之輸入值域對應之像素值調 整對應表111a或111b將像素值進行調整，並輸出調整 後之像素值以調整感光度。 在步驟S201中，所述像素值調整對應表111a、111b 之初始化係在影像攝取之前進行的，其像素值調整對應 表Ilia、111b之設置根據用戶之要求與數位相機本身之 性能來設置，例如，用戶攝影所要之曝光時間以及數位 相機本身之感光度設置範圍。 在步驟S203中，如圖5所示，所述確定獲取當前影 像時適於感光度調整之像素值調整對應表之輸入值域之 方法包括下列步驟： 首先，步驟S301，獲取影像之各像素點之像素值； 步驟S302,選取各像素值調整對應表111a、111b 11 200906175 之輸入值域之較大端點值大於該像素值之像素值調整對 應表； 步驟S303，將該像素值分別與各所選取之像素值調 整對應表之輸入值域之較大端點值求差值； 步驟S304，將所得差值作比較，取得最小之差值； 步驟S305，確定與該差值相對應之輸入值域即為所 選取之值域。 需要說明的是，在該步驟S303中，所進行比較之像 素值調整對應表為111a、111b，在步驟S304中，只將所 得之兩個差值作比較即可。如果有複數像素值調整對應 表時，如三個、四個或更多個，則在步驟S304中，要將 所得之多個差值兩兩作比較，以取得最小之差值。 上述感光度調整裝置及調整方法可根據所獲取之影 像之像素值動態之選擇像素值調整對應表以調整攝影裝 置之感光度，不僅突破了放大器本身之限制，而且還減 少了因感光度之調整而使放大器產生之雜訊號。 綜上所述，本發明符合發明專利要件，爰依法提出 專利申請。惟，以上所述者僅為本發明之較佳實施方式， 本發明之範圍並不以上述實施方式為限，舉凡熟習本案 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内。 【圖式簡單說明】 圖1係本發明提供之感光度調整裝置之功能模組圖。 圖2係本發明的一像素值調整對應表及其所對應之 12 200906175200906175 IX. Description of the Invention: [Technical Field] The present invention relates to an adjustment device for adjusting the image quality of an image pickup, and more particularly to a sensitivity adjustment device and an adjustment method for adjusting the sensitivity of an image pickup device. [Prior Art] With the continuous development of technology, portable electronic devices such as mobile phones have become more and more widely used, and at the same time, they are becoming lighter, more beautiful, and more functional. Among them, the camera function is an additional function of the popular mobile phone in recent years. The digital camera module used in mobile phones not only has to meet the requirements of lightness and thinness, but also has high photographic performance. The sensitivity range is one of the important parameters that affect the photographic quality of the camera module. Therefore, the adjustment of the sensitivity is beneficial to the improvement of the brightness and photographic quality of the acquired image. Sensitivity refers to the sensitivity of the camera to the intensity of the light source. In digital cameras, sensitivity adjustment is done by adjusting the pixel values acquired by the image sensor. When the pixel value obtained by the image sensor is enlarged, the sensitivity is increased, and conversely, the sensitivity is lowered. Generally, the sensitivity is adjusted by adjusting the amplifier of the image sensor itself to enlarge or reduce the signal collected by the image sensor, thereby adjusting the sensitivity of the image sensor and the brightness of the acquired image. However, the above method is limited by the design of the amplifier itself, and during the amplification of the signals it collects, the signal is doped with noise, and 7 200906175 reduces the quality of the image. SUMMARY OF THE INVENTION In view of the above, it is necessary to provide a sensitivity adjusting device and an adjusting method capable of reducing the sensitivity of the image signal and adjusting the sensitivity. A sensitivity adjusting device includes a storage unit for storing a preset plurality of pixel value adjustment correspondence table, each pixel value adjustment correspondence table having an input value field and an output value corresponding to the input value field one-to-one correspondence An image acquisition unit is configured to acquire an image and obtain a pixel value of each pixel of the image, and determine a range of each pixel value; a comparison unit, configured to acquire a pixel value range and a storage unit of the image acquisition unit The input value range of each pixel value adjustment corresponding table is compared, and the input value field is determined; an adjusting unit is configured to adjust the pixel value of the acquired image according to the pixel value adjustment corresponding table corresponding to the determined input value field And output the adjusted pixel value to adjust the sensitivity. A sensitivity adjustment method includes the following steps: acquiring a pixel value of each pixel of the image from the image to be adjusted, and determining a range of the pixel value; adjusting the input of the pixel value range and the complex pixel value correspondence table The value range is compared, and an input value field is determined; and the pixel value of the acquired image is adjusted according to the pixel value adjustment corresponding table corresponding to the determined input value field, and the adjusted pixel value is output to adjust the sensitivity. The sensitivity adjustment device and the adjustment method can dynamically select a pixel value adjustment correspondence table according to the pixel value of the acquired image to adjust the sensitivity of the photography device 8 200906175, which not only breaks the limitation of the amplifier itself, but also reduces the sensitivity. Degree adjustment to make the noise generated by the amplifier. [Embodiment] Hereinafter, the present invention will be further described in detail with reference to the accompanying drawings. Please refer to FIG. 1, which is a functional structure of a sensitivity adjusting apparatus according to an embodiment of the present invention. The sensitivity adjusting device is provided in an image pickup device such as a digital camera, a mobile phone having a photographing function, and personal digital processing. In the present embodiment, the image pickup device is a digital camera. The sensitivity adjustment apparatus includes a storage unit Π, an image acquisition unit 12, a comparison unit 13, and an adjustment unit 14. The storage unit 11 is configured to store a preset complex pixel value adjustment correspondence table. It is of course conceivable that the storage unit 11 can also store other data such as images, texts and the like. As shown in FIG. 2 and FIG. 3, the pixel value adjustment correspondence table is a pixel value adjustment correspondence table of the image, and the corresponding curve is a gamma curve (Gamma curve), and the role of the corresponding table is adjusted by the pixel value. The function of each unit module in the sensitivity adjusting device can enlarge or reduce the pixel value of the image, thereby increasing or decreasing the sensitivity of the digital camera. The pixel value adjustment correspondence table may have a plurality of numbers, but each of the pixel value adjustment correspondence table input value domain and the output value domain system corresponding to each other, and the range of the input value domain of each pixel value adjustment correspondence table is different. The output value fields can be the same or different. In the present embodiment, only two pixel value adjustment correspondence tables Ilia, 111b and their corresponding Gamma curves are provided as an example. In this embodiment, the pixel value adjustment 9 200906175 corresponds to the input value field of the table U1b being one-half of the pixel value adjustment correspondence table Ilia, and their output value fields are the same, both are 0 to 255. The pixel values adjust the input value fields 0 to 255 of the correspondence table 111a, and the pixel values adjust the input value fields 0 to 127 of the correspondence table 111b. It can be understood that the ratio of the input value field of the pixel value adjustment correspondence table 111a to the input value field of the pixel value adjustment correspondence table 111b can be arbitrarily 'such as one third, one quarter or the other. Of course, its output value range can also be different. In the present embodiment, only the sensitivity adjusting device and the adjusting method thereof are described. As the above two examples, in the sensitivity adjustment process, one of them is selected to adjust the sensitivity of the digital camera. The image acquisition unit 12 is configured to acquire an image and obtain a pixel value of each pixel of the image, and determine a range of the pixel value. The image acquisition unit 12 is an image sensing wafer. The comparing unit 13 is configured to compare a pixel value range obtained by the image acquiring unit with each pixel value adjustment correspondence table of the storage unit, such as an input value field of Ilia, 111b, and determine a range suitable for the pixel value. Enter the value range. The adjusting unit 14 is configured to adjust the pixel value of the acquired image according to the pixel value adjustment corresponding table 111a or 111b corresponding to the determined input value field, and output the adjusted pixel value to adjust the sensitivity. If the adjusted pixel value is increased compared to the pixel value before the adjustment, the sensitivity is increased, and if the adjusted pixel value is reduced, the sensitivity is lowered. It is conceivable that, in order to expand the pixel value adjustment correspondence table number 10 200906175, the sensitivity adjusting device may further comprise an initialization setting unit 15 for initializing an input value field of the setting pixel value adjustment correspondence table, which may be The pixel value adjustment correspondence table is adjusted. The adjustment method of the sensitivity adjusting device provided in this embodiment will be described in detail below. As shown in FIG. 4, it is a flowchart of the method for adjusting the sensitivity provided by the present invention. First, in step S201, the setting pixel value adjustment correspondence table is initialized; in step S202, the pixel value of each pixel of the image is obtained from the image to be adjusted, and the range of the pixel value is determined; Step S203, the pixel value range and each Pixel value adjustment correspondence table 111a, 111b input value field comparison, and determine an input value field; Step S204, according to the determined input value field corresponding pixel value adjustment correspondence table 111a or 111b to adjust the pixel value, and output adjustment The pixel value is followed by the sensitivity. In step S201, the initialization of the pixel value adjustment correspondence tables 111a, 111b is performed before the image capturing, and the setting of the pixel value adjustment correspondence table Ilia, 111b is set according to the requirements of the user and the performance of the digital camera itself, for example, The exposure time required by the user's photography and the sensitivity setting range of the digital camera itself. In the step S203, as shown in FIG. 5, the method for determining the input value range of the pixel value adjustment correspondence table for the sensitivity adjustment when the current image is acquired includes the following steps: First, in step S301, the pixels of the image are acquired. a pixel value; in step S302, a pixel value adjustment correspondence table in which a larger end point value of each input value field of each pixel value adjustment correspondence table 111a, 111b 11 200906175 is larger than the pixel value is selected; and step S303, the pixel value is respectively associated with each pixel value The selected pixel value adjusts the larger end point value of the input value field of the correspondence table to obtain a difference value; in step S304, the obtained difference value is compared to obtain a minimum difference value; and in step S305, the input value corresponding to the difference value is determined. The domain is the selected value range. It should be noted that, in this step S303, the pixel value adjustment correspondence tables to be compared are 111a and 111b, and in step S304, only the obtained two difference values may be compared. If there are multiple pixel value adjustment correspondence tables, such as three, four or more, then in step S304, the obtained plurality of differences are compared two by two to obtain the smallest difference. The sensitivity adjusting device and the adjusting method can adjust the correspondence table according to the selected pixel value of the pixel value of the obtained image to adjust the sensitivity of the photographing device, which not only breaks the limitation of the amplifier itself, but also reduces the adjustment due to the sensitivity. And the noise signal generated by the amplifier. In summary, the present invention complies with the requirements of the invention patent, and proposes a patent application according to law. However, the above description is only a preferred embodiment of the present invention, and the scope of the present invention is not limited to the above-described embodiments, and those skilled in the art will be able to make equivalent modifications or changes in accordance with the spirit of the present invention. It should be covered by the following patent application. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a functional block diagram of a sensitivity adjusting device provided by the present invention. 2 is a pixel value adjustment correspondence table of the present invention and corresponding thereto 12 200906175
Gamma曲線。 圖3係本發明之另一像素值調整對應表及其所對應 之Gamma曲線。 圖4係本發明提供之感光度調整方法之流程圖。 圖5係圖4中輸入值域之確定方法之流程圖。 【主要元件符號說明】 存儲單元 11 影像獲取單元 12 比較單元 13 調整單元 14 初始化設置單元 15 像素值調整對應表 Ilia 、 111b 13Gamma curve. Fig. 3 is another pixel value adjustment correspondence table of the present invention and its corresponding gamma curve. 4 is a flow chart of a method for adjusting sensitivity of the present invention. FIG. 5 is a flow chart of a method for determining an input value range in FIG. 4. [Description of main component symbols] Storage unit 11 Image acquisition unit 12 Comparison unit 13 Adjustment unit 14 Initialization setting unit 15 Pixel value adjustment correspondence table Ilia, 111b 13