A7 416216 _B7_ 五、發明說明（） 發明領域： 本發明係與一種影像讀取系統之校正方法有關，特別 是有關於一種應用於影像讀取系統内、用以減少使用之校 正白板寬度的校正方法。 發明背景： 隨著電子工業的進步及電子科技應用的快速發展，電 子工業已成為廿世紀中最重要的工業之一，隨著多種計算 系統及處理系統效能上的提昇，已有越來越多的電子產 品，如電腦、通訊、以及各項消費性電子產品等，被頻繁 的應用於日常生活中。在近年來，由於處理器及電腦等產 品在處理速度及資料儲存與交換能力上的增強，圊形處理 的效能大為增加，使影像處理系統有更為頻繁的使用，而 在影像擷取、處理、傳遞、及輸出等的應用上扮演極為重 要的角色。 一般而言，大多數的影像讀取系統可以分為兩類，第 一類為讀取裝置靜止式的系統，在此類系統之中，影像讀 取裝置或是讀取頭係於文件讀取時保持靜止不動，並藉由 移動原稿經過影像讀取裝置或是讀取頭前方的方式，完成 整份原稿文件的讀取，此類的設計經常可見於傳真機及饋 紙式（sheet-feed)的掃瞄器之中，並由於其設計簡化的特 本紙張尺度適用t國國家標準（CNS)A4規格（210 X 297公窆） (請先閱讀背面之达意事項再填寫本頁) - 裝-------1訂·--------線 經濟部智慧財產局員工消費合作社印S衣 416216 A7 ___B7_ 五、發明說明（） 性，可減少系統的零件數目及縮小整體系統所佔的體積。 相對於讀取裝置静止式的系統，另一類的影像讀取系 統即是所謂的移動式讀取裝置的系統，在此類系統之中， 係驅動影像讀取裝置或是讀取頭平行移動，而以逐線讀取 的方式通過被讀取物或是被讀取文件的前方，並完成整個 掃瞄過程。此類設計較常被應用於較高品質的掃瞄系統之 中，例如傳統的平台式掃瞄器等，以提供較佳的影像品質 及穩定性β 在上述兩類掃瞄器的任一類之中，係使用一整個陣列 或直線列的影像感測器、藉由光源的照明來讀取影像。一 般而言，常使用的光源可包含如勞光燈管（fluorescent lamp) 或陰極射線管類的小型曰光燈管、或是使用單一個或多個 的發光二極體等，以提供所需的照明，將被掃瞄物的影像 反射至影像感測器。 I..----------It·-------訂---------線 (請先閱讀背面之注意事項再填寫本頁) 經濟部智慧財產局員工消費合作社印製 及的然光明的 、 以好。明照源式 、良取照，光方 度有讀到外明與 亮具像達此照間 之上影難；是時 源線的很性其瞄 光瞄質往致尤掃 明掃品往一 、、 照列高，的度度 之 一而中度感溫 供同確之感敏著 提在準統敏之隨 所需供系之器會 ，即提及器測往 中，能件測感往 之度方元感像， 統感，的像影性 系敏性造影及勻 瞄之勻製及以均 掃器均量以度布 在測及大度亮分 而感性在亮之及 像致，之源度 影一而源光亮 本紙張尺度適用中國國家標準（CNS)A4規格（210x 297公釐） A7 416216 _ B7_ 五、發明說明（） 以及其他諸多條件的不同而有所變化，而影響影像讀取的 品質β 為了解決上述的均勻度問題、並改善影像讀取的準確 性，現今多數的掃瞄系統皆具有於掃瞄器啟動後或每次掃 瞄開始前進行校正的設計。在較為常見的設計之中，是使 用一白板做為參考板，並於校正過程_掃瞄白板，再以白 板的亮度做為參考值、或是定義為亮度感測的最亮值，以 做為實際掃瞄時的基準β藉由校正過程中針對每一個別影 像感測器提供相同的參考基準，即可校正因照明光源之亮 度以及影像感測器之敏感度的不一致性及非均勻性的誤 差，而提供一致的基準。 在不限制本發明之精神及應用範圍之下，以下即以一 般的平台式掃描系統為例，介紹白板校正的設計及結構。 第一圖為平台式掃描系統内、由玻璃平板背面處所見的局 部掃瞄器示意圖，其中掃瞄區10會占去大多數的面積， 而原稿或被掃瞄物即可透過透明的玻璃平板來讀取其影 像；校正用的白板12通常即置於掃瞄區10的前方，並同 樣可以透明的玻璃平板加以覆蓋。 在掃瞄器啟動後、或是每次掃瞄起始前，影像讀取裝 置（其讀取區域 14)即會讀取白板 12所在的區域，並藉由 讀取到的影像訊號進行校正的動作，而完成所謂的白板校 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） --:-----------^--------訂---------線 (請先閲讀背面之汶意事項再填寫本頁) 經濟部智慧財產局員工消費合作社印5巩 416216 A7 經濟部智慧財產局員工消費合作社印製 B7 五、發明說明（） 正。 因此’配合上述的校正方式，習知的掃瞄系統之中皆 需提供足夠的白板寬度，例如約為200像素的寬度’以於 白板校正時產生足夠的參考基準。此外，除了提供上述的 基本寬度之外’通常亦需提供額外的白板寬度，以補償掃 瞄系統組裝過程之中因白板貼合位置或角度誤差所造成的 問題、或是補償因影像讀取裝置光開口偏斜的現象；在多 數的掃瞄系統組裝過程中，白板貼合時皆無可避免時會有 少許的位置或角度誤差’如第一圈中所示，而使影像讀取 頭讀取時、在部分區域上會無法取到足夠的寬度。以一般 解析度為每英吋300點（300 dot per inch ; DPI)的掃瞄器而 言’所需的額外寬度之任一例可為約0.85公分，或是約100 像素的寬度。 因此，為了補償組裝生產時的誤差，並提供校正過程 足夠的白板寬度，以此一例子而言，共需要約300像素的 白板寬度，以解析度為每英吋3 00點（300 dot per inch ; DPI) 的掃瞄系統而言，即需要約1英吋' 或是約2.54公分的白 板寬度。在傳統的平台式掃瞄系統之中，2·54公分宽的白 板所占用的額外空間尚在可接受的合理範圍之内；然而， 隨著掃瞄系統體積的日益縮小，白板宽度並無法配合縮 減，而占用過多的體積及玻璃板面積，成為發展未來小艘 積掃瞄系統的一大挑戰與障礙。 本紙張尺度適闬中國國家標準（CNS)A4規格（210 x297公釐） (諳先閲讀背面之注意事項再填寫本頁) --- i I I 丨 · I I I I 丨丨丨-I . 經濟部智慧財產局員工消費合作社印製 416216 A7 _B7 五、發明說明（） 除了上述的體積問題之外，傳統的白板校正方法亦會 產生另一問題，若在組裝時的誤差過大，而使白板位置偏 差過大或傾斜角度過多，可能會在進行校正時使影像讀取 裝置掃瞄到部分白板以外的區域，而使校正基準產生偏 差，使校正發生誤差，導致實際掃瞄時因校正基準變化而 導致讀取影像時濃淡誤差的問題。 發明目的及概述： 本發明的目的為提供一種影像讀取系統之校正方法。 本發明的另一目的為提供一種影像讀取系統之校正方 法，以減少所需使用的白板寬度。 本發明的另一目的為提供一種影像讀取系統之校正方 法，以縮減掃瞄系統的體積。 本發明的另一目的為提供一種影像讀取系統之校正方 法，以改善白板校正的準確度，消除組裝誤差所造成的影 響。 本發明中影像讀取系統之校正方法可包含以下步驟： 首先提供參考板以作為參考準位校正之用；接著以掃瞄線 本紙張又度適用尹國國家標準（CNS)A4規格（210 X 297公釐） * ^裝·----1!訂--------—線 (請先閱讀背面之注意事項再填寫本頁) A7 416216 B7_ 五、發明說明（） 之逐線讀取方式讀取參考板之影像，掃瞄線具有複數個影 像感測器；並選取每一個影像感測器所讀取影像中之至少 一個最大值；最後以對應於個別影像感測器之至少一個最 大值為基準，校正個別影像感測器。 以較佳實施例而言，上述之參考板可使用白板，其最 小寬度可為 I像素。而以配合不同掃瞄系統的校正設計而 言，上述之校正個別影像感測器的步驟可包含：複製至少 一個最大值為複數個參考值；再以對應於個別影像感測器 之複數個參考值為基準，校正個別影像感測器。 圈式簡箪說明 第一圖 顯示由傳統之平台式掃描系統内、玻璃平 板背面處所見的局部掃瞄器示意圖。 第二圖 顯示本發明中進行參考校正時所應用到之 主要硬體元件之功能方塊圖。 第三圖 顯示本發明中之校正方法的處理流程示意 圖。 第四圖 顯示本發明中校正方法應用時顯示部分的 參考板及部分的掃瞄區域之介紹示意圖。 本纸張尺度適用中國國家標準（CNS)A4規烙（2〗〇χ 297公釐） I ^ ---^·-------訂---------線 (請先閱讀背面之注意事項再填寫本頁) 經濟部智慧財產局員Η消費合作社印製A7 416216 _B7_ V. Description of the invention () Field of the invention: The present invention relates to a calibration method for an image reading system, and more particularly to a calibration method used in an image reading system to reduce the width of a calibration whiteboard used. . Background of the Invention: With the advancement of the electronics industry and the rapid development of electronic technology applications, the electronics industry has become one of the most important industries in the 21st century. With the improvement of the efficiency of various computing systems and processing systems, more and more Electronic products, such as computers, communications, and consumer electronics, are frequently used in daily life. In recent years, due to enhancements in processing speed and data storage and exchange capabilities of processors and computers, the efficiency of the cymbal processing has increased, making image processing systems more frequently used. It plays a very important role in applications such as processing, transmission, and output. Generally speaking, most image reading systems can be divided into two types. The first type is a stationary system of the reading device. In this type of system, the image reading device or the reading head is connected to the file reading. Keep it still at all times, and complete the reading of the entire original document by moving the original past the image reading device or the front of the reading head. Such designs are often found in fax machines and sheet-feed ), And because of its simplified design, the special paper size is applicable to the National Standard (CNS) A4 (210 X 297 cm) (Please read the notice on the back before filling out this page)-Install ------- 1 Order · -------- Line of clothing of the Intellectual Property Bureau of the Ministry of Economic Affairs printed S-shirt 416216 A7 ___B7_ V. Description of the invention () can reduce the number of system parts and reduce the overall The volume occupied by the system. Compared with the stationary system of the reading device, another type of image reading system is a so-called mobile reading device system. In this type of system, the image reading device or the reading head is driven to move in parallel. The line-by-line reading mode passes through the front of the object or file being read, and completes the entire scanning process. This type of design is more commonly used in higher-quality scanning systems, such as traditional platform scanners, to provide better image quality and stability. Β is in any of the two types of scanners described above. In the system, an entire array or linear image sensor is used, and the image is read by the illumination of the light source. Generally speaking, commonly used light sources can include small fluorescent lamps such as fluorescent lamps or cathode ray tubes, or use a single or multiple light emitting diodes to provide the required The reflected light reflects the image of the scanned object to the image sensor. I ..---------- It · ------- Order --------- line (Please read the notes on the back before filling this page) Ministry of Economic Affairs Intellectual Property The Bureau's Consumer Cooperatives printed it and it was bright and good. Bright light source type, good taking photos, it is difficult to read the brightness and brightness of the bright light in this photo; it is the nature of the time line, its aiming quality is especially good. One, one of the degrees according to the height of the column, and the medium temperature is the same as the sensitive one. It is provided in the quasi-system, which is provided according to the needs, that is, when the device is measured, the sensor can be measured. The degree of square element image, unity, and image quality are the uniformity of sensitivity contrast and uniformity, and the uniformity of the uniformity of the scanner is measured in degrees and the brightness is large, and the sensitivity is in the brightness and the image. The source of the shadow and the source of light This paper size applies the Chinese National Standard (CNS) A4 specification (210x 297 mm) A7 416216 _ B7_ V. The description of the invention () and many other conditions vary and affect the image Reading quality β In order to solve the above-mentioned uniformity problem and improve the accuracy of image reading, most scanning systems nowadays have a design that is calibrated after the scanner is started or before each scan is started. In more common designs, a white board is used as a reference board, and during the calibration process, the white board is scanned, and then the brightness of the white board is used as the reference value, or the brightest value of the brightness sensing is defined as As the reference β during actual scanning, by providing the same reference reference for each individual image sensor during the calibration process, it is possible to correct inconsistencies and non-uniformities due to the brightness of the illumination light source and the sensitivity of the image sensor Error while providing a consistent benchmark. Without limiting the spirit and scope of the present invention, the following describes the design and structure of whiteboard calibration using a general platform scanning system as an example. The first figure is a schematic view of a local scanner in a flatbed scanning system seen from the back of a glass plate. The scanning area 10 will occupy most of the area, and the original or the scanned object can pass through the transparent glass plate. Read the image; the calibration whiteboard 12 is usually placed in front of the scanning area 10, and can also be covered by a transparent glass plate. After the scanner is started or before each scan is started, the image reading device (its reading area 14) will read the area where the whiteboard 12 is located and correct the image based on the read image signal. Action, and complete the so-called whiteboard school-based paper size applicable to the Chinese National Standard (CNS) A4 specification (210 X 297 mm)-: ----------- ^ -------- Order --------- line (please read the Wen Yi matters on the back before filling out this page) Printed by the Consumers ’Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs, Printed G7 416216 A7 Printed by the Consumers’ Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs, printed B7 Description of the invention () Positive. Therefore, in accordance with the above-mentioned calibration method, the conventional scanning system needs to provide a sufficient whiteboard width, for example, a width of about 200 pixels, so as to generate a sufficient reference for whiteboard calibration. In addition, in addition to the above-mentioned basic width, it is usually necessary to provide an additional whiteboard width to compensate for problems caused by the whiteboard lamination position or angle error during the assembly of the scanning system, or to compensate for the image reading device. The phenomenon that the light opening is skewed; in the assembly process of most scanning systems, there is a slight position or angle error when the whiteboard is inevitably bonded. As shown in the first circle, the image reading head reads In some areas, sufficient width cannot be obtained in some areas. For a scanner with a general resolution of 300 dots per inch (DPI), any one of the extra widths required may be about 0.85 cm or a width of about 100 pixels. Therefore, in order to compensate for errors in assembly production and provide a sufficient whiteboard width for the calibration process, for example, a total width of about 300 pixels of whiteboard is required, with a resolution of 300 dots per inch (300 dot per inch) DPI) scanning system, which requires a whiteboard width of about 1 inch 'or about 2.54 cm. In the traditional platform scanning system, the additional space occupied by a 2.54 cm wide whiteboard is still within an acceptable and reasonable range; however, as the volume of the scanning system is shrinking, the width of the whiteboard cannot match Reduction, while occupying too much volume and glass plate area, will become a major challenge and obstacle for the development of future small ship scan systems. This paper is suitable for China National Standard (CNS) A4 (210 x 297 mm) (read the notes on the back before filling this page) --- i II 丨 · IIII 丨 丨 丨 -I. Intellectual Property of the Ministry of Economic Affairs Printed by the Bureau ’s Consumer Cooperatives 416216 A7 _B7 V. Description of the invention () In addition to the above-mentioned volume problems, the traditional whiteboard calibration method will also generate another problem. Too many tilt angles may cause the image reading device to scan to areas other than the whiteboard during calibration, which will cause deviations in the calibration reference and errors in the calibration, resulting in reading the image due to changes in the calibration reference during actual scanning The problem of time gradation error. Object and Summary of the Invention The object of the present invention is to provide a calibration method for an image reading system. Another object of the present invention is to provide a calibration method for an image reading system to reduce the width of a whiteboard required. Another object of the present invention is to provide a calibration method for an image reading system to reduce the size of the scanning system. Another object of the present invention is to provide a calibration method for an image reading system to improve the accuracy of whiteboard calibration and eliminate the influence caused by assembly errors. The calibration method of the image reading system in the present invention may include the following steps: firstly, a reference plate is provided for reference level calibration; then, the scanning paper is adapted to the Yin National Standard (CNS) A4 specification (210 X 297 mm) * ^ installed · ---- 1! Order ---------- line (please read the precautions on the back before filling in this page) A7 416216 B7_ 5. Line by line of the description of the invention () The reading method reads the image of the reference board, and the scanning line has a plurality of image sensors; and selects at least one of the maximum values of the images read by each image sensor; finally, the image corresponding to the individual image sensor is selected. At least one maximum value is used as a reference to calibrate individual image sensors. In a preferred embodiment, a white board can be used as the reference board, and the minimum width can be 1 pixel. To match the calibration design of different scanning systems, the above steps of calibrating individual image sensors may include: copying at least one maximum value to a plurality of reference values; and then using a plurality of references corresponding to the individual image sensors. The values are based on calibration of individual image sensors. Brief description of the circle type The first figure shows a schematic view of a partial scanner seen from the back of a glass plate in a conventional flatbed scanning system. The second figure shows the functional block diagram of the main hardware components used in the reference calibration in the present invention. The third figure is a schematic diagram showing the processing flow of the correction method in the present invention. The fourth figure shows the introduction of the reference plate of the display part and the scanning area of the part when the calibration method is applied in the present invention. This paper size is applicable to Chinese National Standard (CNS) A4 (2〗 〇297 297 mm) (Please read the notes on the back before filling out this page) Printed by a member of the Intellectual Property Bureau of the Ministry of Economic Affairs and a Consumer Cooperative
416216 A? 五、發明說明（） 發明详細說明： 本發明中提供一種影像讀取系統之校正方法’藉 正方式的改變，可縮減所需使用的白板寬度及所占想積° 利用選取所掃瞄之白板附近區域影像之最大值或最明亮 丈舍影 值、做為校正基準，可大幅減少所需白板寬度’而小 準校正的精破度，在較小的白板寬度下’以平台式样描系 坡誤 統而言，即可縮減掃瞄系統的體積及玻璃板面積’組取 差時白板偏移所造成之掃瞄影像品質降低的問題。 參見第二圖所示，即為進行參考校正時所應用到之主 要硬韙元件之功能方塊®，在不限制本發明之精神及應用 範圍之下，以下即以一般的平台式掃描系統為一較隹實施 例，介紹白板校正的系統與方法。 一般的平台式掃描系統皆屬於如發明背景中所述之移 動式讀取裝置的系統，平台式掃描系統可包含第二闽中所 述之影像讀取頭20 ’其可包含光源2〇a及影像讀取裝置 20b。一般來說，光源20a可使用螢光燈管或陰極射線管等 類的長條型燈管，以提供長條狀的照明區域，照亮掃晦線 所在區域’以A4尺寸的平台式掃描系統而言，燈管的長 度即約在2 1 0公厘以上。 影像讀取裝置20b多數會採用具有感光能力的電荷叙 本纸張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐〉 n ϋ n I J— · n i D ft n *1 f . (請先閱讀背面之注意事項再填寫本頁) 經濟部智慧財產局員工消費合作社印5私 416216 A7 經濟部智慈財產局員工消費合作社印製 9416216 A? 5. Description of the invention () Detailed description of the invention: The present invention provides a correction method of the image reading system. 'The change of the positive method can reduce the width of the whiteboard and the desired product. The maximum or brightest image of the area near the scanned whiteboard is used as the calibration standard, which can greatly reduce the required whiteboard width, while the accuracy of the small quasi-correction is reduced to the platform In terms of slope error, the size of the scanning system and the area of the glass plate can be reduced, which can reduce the scanning image quality caused by the whiteboard shift when the difference is taken. Refer to the second figure, which is the functional block of the main hard component used in reference calibration. Without limiting the spirit and scope of the present invention, the following is a general platform scanning system. The comparative example describes the system and method of whiteboard calibration. The general platform scanning system belongs to the system of the mobile reading device as described in the background of the invention. The platform scanning system may include the image reading head 20 ′ described in the second embodiment, which may include a light source 20a and Image reading device 20b. Generally, the light source 20a can use a long-type lamp such as a fluorescent tube or a cathode ray tube to provide a long-shaped illumination area to illuminate the area where the shading line is located. 'A4 size platform scanning system In terms of length, the length of the lamp tube is about 210 mm or more. Most of the image reading devices 20b will use a charge-reading paper with photosensitivity. The paper size is applicable to the Chinese National Standard (CNS) A4 (210 X 297 mm) n ϋ n IJ— · ni D ft n * 1 f. (Please (Please read the notes on the back before filling out this page) Printed by the Consumers ’Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs 5 Private 416216 A7 Printed by the Employees’ Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs 9
Β7 五、發明說明（） 合元件（charged coupled device; CCD)’並配合相關的反射 镜片組、成像透鏡組、以及濾色片或是分色用的三棱鏡等。 以讀取彩色影像而言’電荷耦合元件即是呈陣列狀排列， 以由不同列的感應單元分別感測不同顏色的影像’例如紅、 綠、藍（RGB)三色等。此外，在不同的設計之中’影像讀 取頭20亦可直接使用接觸式影像感應（contact imaSe sens〇r; CIS )模組’而由單一模組同時提供光源、影像感測器、以 及部分的控制電路等。在較新近的設計之中’亦可使用以 互補式金氧半導體（comp〖ementary metal oxide semiconductor; CMOS)元件組成的感光單元來取代上述的 電荷搞合元件（CCD)。 為了進行校正，即如第二圖中所示提供一參考板22 ,ϋ ib纯白 以較佳實施例而言，參考板22可使用一白板，以赭 ^像 色的平板做為亮度準位的校正基準。處理單元24則與=理 讀取頭20相連結，本例中之處理單元24内玎包含如要 器24a、類比-數位轉換器24b '以及記憶體24c等的 * > 9 4·相迷 裝置。控制單元26則與影像讀取頭20及處理单凡 22、以 結，以控制影像讀取頭20的運動’來掃瞄參考板 ^ *Ijt 及被掃瞄物及被掃瞄稿件等。一般而言’掃描後經* ^ I理設 單元24處理的訊號會傳送呈主機28、例如電肠等 備之中。 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公爱） -I J----------、裝--------^---------線.- - * <靖先閱讀背面之注意事項再填寫本頁) 416216 經濟部智慧財產局8工消費合作社印製 A7 B7_______- 五、發明說明（） 參見第三圏，即為本發明中之校正方法的處理流程示 意囷’首先進行步驟30中提供參考板的步驟，參考板即可 應用如上所述的白板，以作為參考準位的校正之用；在較 佳實施例之中’參考板之最小寬度僅需1像素，即可足夠 本發明中之選取最大值方法之應用，但亦可視準確度、可 靠度、以及掃瞄系統設計的不同需要，變化參考板的寬度， 以本例而言’參考板之宽度可為1或2像素至50像素之間， 其實際宽度則可由掃瞄系統之解析度換算而得。 參見第四囷所示，為簡化介紹起見’圖中僅顯示部分 的參考板及部分的掃瞄區域，其中為突顯組裝的誤差、係 顯示較為誇張的參考板22之傾斜程度，而產生參考板之位 置可相對於各個掃瞄線A至Η產生傾斜的狀況。 接著即於第三圖的步驟32中讀取參考板之影像，—般 係以個別掃瞄線逐線讀取的方式、讀取參考板22之影像， 掃晦線係具有多數個呈直線或陣列狀排列的影像感測器， 以掃瞄一整列的影像。如第四圖中所示，即顯示掃猫掃晦 線Α至Η時每列中個別影像感測器所讀取的格點，以圏中 所顯示的區域而言，影像讀取頭20即需掃瞄至每一個影像 感測器皆讀取到參考板22的至少部分區域’例如由梂糾 **坪晦線 Α至掃瞄線G。在本例之中，影像讀取頭20可掃瞄至每— 個影像感測器皆讀取到部分的參考板22區域、而能得# 少一個最大值即可。 至 本纸張尺度適用中國國家標準（CNS)A4規格（210 X 297公;S ) 1 ^----------- ---I--- ί 訂·! * - ' (請先閲讀背面之注意事項再填寫本頁) 416216 A7 五、發明說明（ 在第三圖中的步胁μ @ ^ 掃瞄參考板後，即於步驟34選 取每一個影像感測器所诗 士 m U所讀取影像中之一個、或是多個最大 ^ λ ή 的第5個影像感測器的掃瞄區域，在掃 過掃猫線Α至掃瞄線〇接，甚 @+ & 大值即會由參考板所在位置 處也就疋掃^線C處、因装l ,.rs ^ ^ ^ η 其月亮度較问而產生相對於其 他£域的差異’因此g各 即會在步驟34被選取出來。在第二圖 中上述所介紹之掃瞄李餘 陌糸統之中，此一選取步驟可藉由處 單元24的記錄及比較 ^ 衩運算而元成丨若是使用寬度較宽的白 板，例如20或3〇像素 見的白 1豕京的+板等，即可於步驟34選取出多 個最大值來做為參老禮，；??··»*^ .〇. 专值 而增加校正的準確性及不同位置 感測器的一致性》 最後，即針對各個可能各具不同敏感度、並於掃瞄區 接受到可能不同亮度之個別影像感測器’進行校正的步驟， 如第二圖中的步驟36，並以對應於個別影像感測器之一個 或多個最大值為基準，校正每—個影像感測器。因此，藉 由此一方法，即可以最小的白板寬度，來達成良好的校正 效果’而不會影筚校正的準確性與一致性，並可消除傳統 方法中因白板位置偏差過大而導致的校正誤差問題。 在不同的掃瞄系統設計之中，可能會由於不同的校正 需求而需要更多的參考值，例如100或是200像素等，為 配合此類系統的不同需求，校正步称36即可調整為以下的 本紙張尺度適用中國國家標準（CNS)A4現格（210 X 297公$ ) (諳先W讀背面之注意事項再填寫本頁) 裝--------訂- ------.線 經濟部智慧財產局員工消費合作社印製 416216 A7 _B7 五、發明說明（） 方式：首先須擴充參考值、也就是複製一個或多個的最大 值、成為更多個參考值，並將參考值儲存；然後再以對應 於個別影像感測器的之多數個參考值、例如I 0 〇或2 0 0個 參考值為基準，校正個別影像感測器，即可達成配合不同 設計之使用需求的目的。並可進一步縮小校正白板的寬度 至數公厘以下，大幅減少掃瞄系統的體積。 本發明以較佳實施例說明如上，僅用於藉以幫助了解 本發明之實施，非用以限定本發明之精神，而熟悉此領域 技藝者於領悟本發明之精神後，在不脫離本發明之精神範 圍内，當可作些許更動潤飾及等同之變化替換，其專利保 護範圍當視後附之申請專利範圍及其等同領域而定。 I'---------^---- I---訂--------- (請先閱讀背面之注意事項再填寫本頁) 經濟部智慧財產局員工消費合作社印*'Λ 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公Μ )Β7 V. Description of the invention () Coupled element (charged coupled device; CCD) 'and cooperate with related reflective lens group, imaging lens group, color filter or prism for color separation. In terms of reading color images, the 'charge-coupled elements are arranged in an array, and the images of different colors are sensed by sensing units in different columns, for example, three colors of red, green, and blue (RGB). In addition, in different designs, 'the image reading head 20 can also directly use a contact image sensing (CIS) module; and a single module can simultaneously provide a light source, an image sensor, and a part. Control circuit and so on. In more recent designs, a photosensitive unit composed of a complementary metal oxide semiconductor (CMOS) element can be used instead of the charge-coupled element (CCD). For calibration, a reference plate 22 is provided as shown in the second figure. In the preferred embodiment, the reference plate 22 can use a white board and a flat plate of color as the brightness level. Calibration benchmark. The processing unit 24 is connected to the physical reading head 20. The processing unit 24 in this example contains a device 24a, an analog-to-digital converter 24b ', and a memory 24c. * ≫ 9 4 · 相 迷Device. The control unit 26 scans the reference board ^ * Ijt, the scanned object and the scanned manuscript with the image reading head 20 and the processing unit 22 to control the movement of the image reading head 20 '. Generally speaking, the signals processed by the scanning unit 24 after being scanned are transmitted to the host 28, such as an electric intestine. This paper size applies to China National Standard (CNS) A4 specification (210 X 297 public love) -I J ----------, installed -------- ^ ------- --Line.--* < Jing first read the notes on the back before filling out this page) 416216 Printed by A8 B7 _______- 8 Cooperative Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs The processing flow of the correction method in the invention is schematic. 'First, the step of providing a reference board in step 30 is performed, and the reference board can apply the white board as described above for the reference level correction; in the preferred embodiment, 'The minimum width of the reference plate only needs 1 pixel, which is enough for the application of the method of selecting the maximum value in the present invention. However, the width of the reference plate can be changed depending on the accuracy, reliability, and different needs of the scanning system design. In this example, the width of the reference plate can be between 1 or 2 pixels and 50 pixels, and the actual width can be obtained by converting the resolution of the scanning system. See Figure 4 for the sake of simplicity. 'Only part of the reference plate and part of the scanning area are shown in the figure. In order to highlight the assembly error and display the inclination of the reference plate 22 which is exaggerated, a reference is generated. The position of the plate may be inclined relative to each of the scanning lines A to Η. Then, the image of the reference plate is read in step 32 of the third figure. Generally, the image of the reference plate 22 is read line by line with individual scanning lines. The scanning lines have a plurality of lines or An array of image sensors to scan an entire row of images. As shown in the fourth figure, the grid points read by the individual image sensors in each column are displayed when the cat scans the lines A to Η. In terms of the area shown in 圏, the image reading head 20 is It is necessary to scan until each image sensor reads at least a part of the area of the reference plate 22, for example, from the correction line A to the scan line G. In this example, the image reading head 20 can scan to a part of the reference plate 22 area which is read by each of the image sensors, and the maximum number of # can be obtained. To this paper size, the Chinese National Standard (CNS) A4 specification (210 X 297 male; S) 1 ^ ----------- --- I --- 订 Order *! *-'( Please read the precautions on the back before filling in this page) 416216 A7 V. Description of the invention (steps in the third picture μ @ ^ After scanning the reference board, select each poet in step 34 One of the images read by m U, or the scan area of the fifth image sensor with the largest ^ λ price, is scanned across the cat line A to the scan line 0, even @ + & The large value will be scanned from the position of the reference plate to line ^ C. Due to the difference in the monthly brightness of l, .rs ^ ^ ^ η, it will cause a difference from the other £ domains. Step 34 is selected. In the scanning of the Li Yumo system described above in the second figure, this selection step can be performed by recording and comparison of the unit 24 ^ 衩 operation, and if the width is used, Wide whiteboards, such as the +1 board of Bai 1 Jingjing at 20 or 30 pixels, etc., can select multiple maximum values as the old ceremony in step 34; ?? ·· »* ^ .〇. Specific value Accuracy and Consistency of Sensors in Different Positions "Finally, the calibration steps are performed for individual image sensors that may have different sensitivities and receive different brightness in the scanning area, as shown in the second figure In step 36, each image sensor is calibrated based on one or more maximum values corresponding to the individual image sensors. Therefore, by this method, the minimum whiteboard width can be achieved. 'Good calibration effect' does not affect the accuracy and consistency of the calibration, and can eliminate the problem of calibration errors caused by excessive deviation of the whiteboard position in the traditional method. In different scanning system designs, it may be caused by different The calibration needs require more reference values, such as 100 or 200 pixels. To meet the different needs of such systems, the calibration step 36 can be adjusted to the following paper standards. Applicable to China National Standard (CNS) A4. Grid (210 X 297 $) (谙 Please read the precautions on the back before filling out this page) Packing -------- Order -------. Printed by the Consumers ’Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs 416216 A7 _B 7 V. Description of the invention () Method: First, the reference value must be expanded, that is, one or more of the maximum values are copied to become more reference values, and the reference values are stored; then, the reference values corresponding to the individual image sensors are stored. Most of the reference values, such as I 00 or 200 reference values, can be adjusted by adjusting the individual image sensors to meet the needs of different designs. The width of the calibration whiteboard can be further reduced to several millimeters. The following description will reduce the volume of the scanning system substantially. The present invention is described above in the preferred embodiment, and is only used to help understand the implementation of the present invention. It is not intended to limit the spirit of the present invention, and those skilled in the art will appreciate this. After the spirit of the invention, without deviating from the spirit of the invention, when it can be modified and replaced with equivalent changes, the scope of patent protection shall depend on the scope of the attached patent application and its equivalent fields. I '--------- ^ ---- I --- Order --------- (Please read the notes on the back before filling out this page) Employees of the Intellectual Property Bureau of the Ministry of Economic Affairs Cooperative society stamp * 'Λ This paper size applies to China National Standard (CNS) A4 specification (210 X 297 gM)