Α7 Β7 五 、發明説明（ 本發明係有關於平台式影像掃瞄器（flatbed scanner)方面 的技術，特別是有關於一種應用在平台式影像掃猫器中’ 用以校正掃瞄文件之水平起始點的方法與裝置。 平台式影像掃瞄器爲一種常用之影像掃瞄裝置’用以 將文件上之文字及圖形等印刷資料經一掃瞄程序而轉換成 數位形式。平台式影像掃瞄器一般包含一光學感應裝置， 用以將放置於平台上之一透明玻璃視窗上的文件上的資料 經掃瞄過程而轉換成數位形式。此光學感應裝置—般係由 一線性陣列之電荷藕合裝置（Charge Coupled Device，CCD)所構 成，並裝設於一可移動之載具（carriage)上。 於掃瞄過程中，文件係將掃瞄的一面朝下放置，並固 定於透明玻璃視窗上，再將載具移動以使CCD光學感應裝 置通過透明玻璃視窗下方，以逐行掃瞄之方式（line-by-line) 將文件上所印的資料經光學掃瞄及CCD的光電感應，而轉 渙成數位形式。 透明玻璃視窗一般爲一長方形，且尺寸須較掃瞄之文 件的尺寸爲大，以使光學感應裝置能夠掃瞄到整張文件。 文件放置於透明玻璃視窗的方式係將文件的一角對準透明 玻璃視窗的一指定角（稱爲參考角）放置。此參考角即爲 掃瞄影像中之像素點（pixel)座.標中的原點（0，0 )。設計平台 式影像掃瞄器中的一項重要課題便是在於如何使光學感應 裝置中的CCD陣列能準確地定位於此參考角上，以使掃瞄 程序能正好從文件的最左上角開始進行。 一 2 - 匕'紙張尺度適用中國國家標準（CNS ) A4規格（21〇>< 297公釐） ----------f------IT------ (請先閲讀背面之注意事項再填寫本頁) 經濟部中央標準局員工消費合作社印製 經濟部中央標準局員工消費合作社印製 A7 ____________B7五、發明説明（） 習知之技術包括美商惠普公司（Hewlett Packard Inc.)的中 華民國專利第147,499號，名稱爲“在一文件掃瞄機中找出亥 件參考角之位置的方法與裝置”。然而此專利所揭露之方法 與裝置在進行CCD光學感應裝置之位置調整時，須同時在 文件之X B方向及Y軸_.发向作調整》此雙向調整之方式使 得調整誤差較大，且亦較費時。 本發明之主要目的便是在於提供一種新穎之掃瞄文件 水平起始點之校正方法與裝置，其可僅在單方向作位置調 整，以使掃瞄裝置能更快速地定丨^文件之水平起始點的 — .. 一 _· "，—————— 位置， ---------- 根據以上所述之目的，本發明提供了一種新穎之掃瞄 文件水平起始點之校正方法與裝置。本發明在方法上包含以 下步驟：（1)將至少二個暗色之校正標誌設置在文件前緣 及該掃瞄裝置之原始位置的中間；該二個校正標誌之平行 中心線與該掃瞄裝置之原始位置相距一第一距離，且與該 文件前緣相距一第二距離；（2)將掃瞄裝置自原始位置向 前移動第一距離至該二個校正標誌上；（3)令該掃瞄裝置 偵測出該二個校正標誌之內側邊線的位置，藉以求出掃猫 裝置上之第一個CCD惑測單元與偵測出該二個校正標誌中 近水平起始點之校正標誌之內側邊線位置的CCD感測單元 二者之間所有CCD感測單元的第一總數，以及二個校正標 誌之內側邊線之間所有CCD感測單元的第二總數；（4 )將 上述第二總數之値減去文件之寬度所對應的像素點總數再 ---------^------1T------^ {請先閲讀背面之注意事項再填寫本頁) 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） ^96440 Α7 Β7 i、發明説明（） 經濟部中央標.準局β貝工消費合作社印製 除二，以求出該二個校正標誌之內側邊線與文件之水平起 始點二者之間的像素點之第二總數；（5)將第一總數與第 二總數相加，以求出掃瞄裝置上對應文件之水平起始點之· CCD感測單元爲何者；（6)將掃瞄裝置自該二個校正標誌 處向前移動第二距離至文件前緣；（7)將掃瞄裝置自文件 前緣向前移動通過文件上方，並從對應文件之水平起始$ 之CCD感測單元開始，對文件進行掃瞄程序。 校正裝置包含至少二個暗色之校正標誌’設置在文 件前緣及該掃瞄裝置之原始位置的中間；該二個校1E標誌 之平行中心線與該掃瞄裝置之原始位置相距一第一距離’ 且與該文件前緣相距一第二距離。該校正裝置所執行之校 正程序係首先將掃瞄裝置自原始位置向前移動第一距離至 該二個校正標誌上，令該掃瞄裝置偵測出該二個校正標誌 之內側邊線的位置，藉以求出掃瞄裝置上之第一個CCD感 測單元與偵測出該二個校正標誌中近水平起始點之校正標 誌之內側邊線位置的CCD感測單元二者之間所有CCD感測 單元的第一總數，以及二個校正標誌之內側邊線之間所有 CCD感測單元的第二總數；接著將上述第二總數之値減去 文件之寬度所對應的像素點總數再除二’以求出該一個校 正標誌之內側邊線與文件之水平起始點二者之間的像素點 之第二總數；接著將第一總數與第二總數相加’以求出掃 瞄裝置上對應文件之水平起始點之CCD惑測單元爲何者；再 接著將掃瞄裝置自該二個校正標誌處向前移動第一距離至 文件前緣；最後將掃瞄裝置自文件前緣向前移動通過文件 一 4 - 本紙張尺度適用中國國家標準（CNS ) A4規格（210><297公釐〉 私衣— (請先閲請背面之注意事項再填寫本頁) '訂 線 A7 B7 經濟部中央標准局員工消费合作杜印製 五、發明説明（） 上方’並從對應文件之水平起始點之CCD感測單元開始’ 對文件進行掃瞄程序》 以下參佐所附圖示詳細說明本發明之實施例： 第1A-1C圖顯示採用本發明之掃瞄文件水平起始點校正方法 與裝置之平台式影像掃瞄器的側視示意圖，分別.顯 示其中之掃瞄程序的三個操作階段； 第2圖顯示第1圖之影像掃瞄器的上視示意圖；以及 第3圖爲一流程圖，顯示本發明之掃猫文件水平起始點校 正裝置執行校正過程中所採用的步驟。 請參閱第1A-1C圖，其中顯示採用本發明之掃瞄文件 水平起始點校正裝置之一平台式影像掃瞄器1〇〇的側視 示意圖。如第1A圖所示，此平台式影像掃瞄器100在機 構上大致與習知者相同，包含一可移動之掃瞄裝置110 以及一用以放置一文件D的透明玻璃視窗120 。掃瞄裝 置110內包含一光源111 ’ 一光學掃瞄頭（scan head) 112 ，一光學鏡片系統113 ，以及一光學感應裝置 114 。掃瞄裝置110於未使用於掃瞄文件之時，係停置 於右側，使其掃瞄頭1 1 2位於—原始位置（Home) PQ上。 光學感應裝置114由一直線陣列之複數個電荷藕合 裝置（CCD)感測單元（未詳細顯示）所組成，每單位長度內 之ccp_感測單元的.總數即代表掃瞄裝置…之一解析度 (resolut丨on)，7 般以 DPI (dot perϋ：)表i。單一個 CCD 感測單元 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） (請先閲讀背面之注意事項再填寫本頁〕 、--° A7 B7 經濟部中夬標準局員工消費合作社印製 五、發明説明（） 即對應於瞄裝影像上的一個像素點（pixel) » —般平台式影像 掃瞄器提供包括300 dpi，600 dpi，1,200 dpi等不同程度之解析 度》以下本發明之實施例中將以600 dpi爲例作說明。由於 此處之掃瞄裝置1 1 〇其結構及功能均屬習知之技術，因 此於本說明書中將不對其作詳細之敘述。 請同時參閱第2圖，本發明之特徵部分在於透明玻璃 視窗120的上緣處之校正紙（Calibration Paper)上設有二暗色 之方形校正標誌301 ，3 0 2 ，其暗色與周圍之機體表面 的顏色之間的對比（contrast)愈大愈好，以使CCD光學感應 裝置114較易偵測出校正標誌301 ， 302的內側邊線 301a，302a之位置。此二個校正標誌301 > 302設 置在掃瞄裝置110之原始位置P。與文件D之前緣（亦即 圖中所示之位置p2)的中間處；且該二個校正標誌 301 ，302之水平中心線（亦即圖中所示之位置Pi)與該 掃瞄裝置11〇之原始位置P|)相距之距離爲·>^ ’而與該 文件前緣位置p2之距離爲3其中距離^1及之値均 爲預先量測而得’並預存於該掃猫裝置1 10的位移控制 器（未顯示）中。 所欲掃猫之文件D在第2圖中係放置於透明玻璃視窗 1 2 0上之虛線方框1 2 1所示的位置上’其垂直中心線如 虛直線C所示。文件D之寬度爲’，長度爲1 °以下本 發明之實施例中將以最常用之8 5x11吋（Letter Slze)之文件紙 張爲例作說明，亦即时’ L=U时。掃猫裝置11〇之 最大水平掃瞄範圍如長度S所示。 -6 - 本紙張尺度適用中國S家標準（CNS ) A4規格（210x297公釐） ¥ m —m · ¾-- (請先閲讀背面之注意事項再填寫本頁) 訂 —I If i A7 •B7 經濟部中央標準局肩工消費合作社印裝 五、發明説明（） 對文件D進行掃瞄程序之前，掃瞄裝置11〇首先須 執行一根據本發明之校正程序，以找出文件D之水平起始 黏〇的座標位置（亦即第2圖中之虛線方框121的最左上角 的像素點），並以掃瞄裝置110中之光學惑應裝置114上 對應於此水平起始點〇之CCD感測單元爲掃瞄起始之像素 點a此校正程序之流程圖如第3圖所示3 請參閱第3圖’校正程序於步驟501中將掃瞄器100 開機後，便執行步累502 ’以將掃瞄裝置11〇自原始位置 P〇移動內建之距離’使掃瞄裝置11〇上的掃瞄頭112 大致對準二個校正標誌301 - 30 2上之水平中心線位置 P ,(如第1B圚所示）。 接著於步驟503及5〇4中令掃瞄裝置11〇中之CCD光 學感應裝置114分別讀取二個校正標誌301 ’ 3 0 2上之 反射資料並記錄各像素點之RGB値》 接著於步驟5 1 1中，若偵測到位於左方之校正標誌 3〇1之內側邊線301a的CCD感測單元在陣列中的位置爲 左起第α個，則代表光學感應裝置中之第一個CCD感測單元 至校正標誌301之內側邊線301a二者之間之水平（X軸 方向）距離所包含之CCD感測單元的總數爲《 3 同時在步驟5 2 1中，若偵測到位於右方之校正標誌 302之內側邊線302a的CCD感測單元在陣列中的位置爲 左起第個，則代表二個校正標誌3 〇 1 ，3 0 2之內側邊線 3 0 1a ， 302a之間的水平距離中所包含之像素點的個數 4爲4 =免· α 。 —-— ___一 Ί — 本紙張尺度賴 ) AW( ΐΓ〇Χ291^ ) I I I I I- n - (請先閱讀背面之注意事項再填寫本頁) ----iT------- 絲 經濟部中央標準局員工消費合作杜印製 ΑΊ B7 i、發明説明（） 接著於步驟511中’以下面公式 b - A i 2 - W * (Resolution)! 2 計算左邊之校正標誌301之內側邊線301a至文件水平起 始點Ο之水平距離中所包含之像素點的個數’其中 b 爲左邊之校正標誌301之內側邊線301a至文件 水平起始點〇之水平距離中所包含之像素點的個 數； A 爲二個校正標誌301 ’ 302之內側邊線 3 0 1a ， 302a之間的水平距離中所包含之像素 點的個數； W 爲文件寬度；Α7 Β7 V. Description of the invention (The present invention relates to the technology of the flatbed scanner), in particular to the application of a flatbed image scanner to correct the level of scanned documents. The method and device of the starting point. The platform image scanner is a commonly used image scanning device 'used to convert the printed data such as text and graphics on the document into a digital form through a scanning process. The platform image scanner It generally includes an optical sensing device for converting data on a document placed on a transparent glass window on the platform into a digital form through a scanning process. This optical sensing device is generally coupled by a linear array of charges Device (Charge Coupled Device, CCD), and installed on a movable carrier. During the scanning process, the document is placed with the scanning side down and fixed in a transparent glass window Then move the carrier to make the CCD optical sensor device pass through the transparent glass window, and scan the data printed on the document by line-by-line. Learn the scanning and photoelectric induction of CCD, and turn into digital form. The transparent glass window is generally a rectangle, and the size must be larger than the size of the scanned document, so that the optical sensing device can scan the entire document. The way to place the document in the transparent glass window is to align the corner of the document with a specified angle (called the reference angle) of the transparent glass window. This reference angle is the pixel coordinate of the scanned image. Origin (0,0). An important issue in designing a platform-type image scanner is how to accurately position the CCD array in the optical sensing device at this reference angle, so that the scanning process can be just right Start from the top left corner of the document. One 2-The dagger's paper size is in accordance with the Chinese National Standard (CNS) A4 specification (21〇 < 297mm) ---------- f --- --- IT ------ (Please read the precautions on the back before filling this page) Printed by the Ministry of Economy Central Standards Bureau Employee Consumer Cooperatives Printed by the Ministry of Economic Affairs Central Standards Bureau Employee Consumer Cooperatives A7 ____________B7 V. Description of invention ( ) Known technologies include American Hewlett Packard Hewlett Packard Inc.'s Republic of China Patent No. 147,499, titled "Method and Device for Finding the Position of the Reference Angle of the Hai Piece in a Document Scanner." However, the method and device disclosed in this patent are in progress When adjusting the position of the CCD optical sensing device, it is necessary to adjust the XB direction and Y axis of the document at the same time. This two-way adjustment method makes the adjustment error larger and more time-consuming. The main purpose of the present invention is to To provide a novel method and device for correcting the horizontal starting point of a scanned document, which can be adjusted in one direction only, so that the scanning device can more quickly determine the horizontal starting point of the document. _ · &Quot;, —————— Position, ---------- According to the above purpose, the present invention provides a novel method and device for correcting the horizontal starting point of scanning documents. The method of the present invention includes the following steps: (1) Set at least two dark calibration marks between the front edge of the document and the original position of the scanning device; the parallel center line of the two calibration marks and the scanning device The original position is at a first distance and a second distance from the leading edge of the document; (2) Move the scanning device forward from the original position by a first distance to the two calibration marks; (3) Make the The scanning device detects the position of the inner edge of the two calibration marks, so as to find the first CCD puzzle unit on the cat sweeping device and the calibration mark that detects the near horizontal starting point of the two calibration marks The first total number of all CCD sensing units between the two CCD sensing units at the inside edge position, and the second total number of all CCD sensing units between the inside edges of the two correction marks; (4) The total value minus the total number of pixels corresponding to the width of the document --------- ^ ------ 1T -------- ^ {Please read the precautions on the back before filling in this Page) This paper scale is applicable to China National Standard (CNS) A4 specification (210X297 ) ^ 96440 Α7 Β7 i. Description of the invention () Central Standard of the Ministry of Economic Affairs. Quasi-Bureau β Beigong Consumer Cooperatives printed and divided by two to find the inner edge of the two calibration marks and the horizontal starting point of the document The second total number of pixels; (5) Add the first total number and the second total number to find the horizontal starting point of the corresponding document on the scanning device · What is the CCD sensing unit; (6) Scan The pointing device moves forward from the two calibration marks a second distance to the leading edge of the document; (7) Move the scanning device forward from the leading edge of the document through the top of the document, and start from the level of the corresponding document The test unit starts and scans the file. The calibration device includes at least two dark calibration marks' set between the front edge of the document and the original position of the scanning device; the parallel centerlines of the two calibration 1E marks are separated from the original position of the scanning device by a first distance 'And a second distance from the leading edge of the file. The calibration procedure performed by the calibration device first moves the scanning device forward from the original position by a first distance to the two calibration marks, so that the scanning device detects the position of the inner edge of the two calibration marks, In order to find all the CCD sensing between the first CCD sensing unit on the scanning device and the CCD sensing unit that detects the position of the inner edge of the calibration mark of the near horizontal starting point of the two calibration marks The first total number of cells, and the second total number of all CCD sensing units between the inner edges of the two calibration marks; then subtract the total number of pixels corresponding to the width of the file and subtract two from the value of the second total Find the second total number of pixels between the inside edge of the one calibration mark and the horizontal starting point of the document; then add the first total number and the second total number to find the corresponding document on the scanning device What is the CCD measurement unit at the horizontal starting point; then move the scanning device forward from the two calibration marks a first distance to the leading edge of the document; and finally move the scanning device forward from the leading edge of the document Document 1-This paper scale is applicable to the Chinese National Standard (CNS) A4 specification (210 > < 297mm) Private clothing — (please read the precautions on the back before filling in this page) Printed by the Bureau of Standards and Staff's Consumer Cooperation V. Description of the invention () Above 'and starting from the CCD sensing unit of the horizontal starting point of the corresponding document' Scanning procedure of the document "The following attached drawings illustrate the invention in detail Examples: Figures 1A-1C show a schematic side view of a platform image scanner using the method and apparatus for calibrating the horizontal starting point of a scanning document of the present invention, showing the three operating stages of the scanning procedure, respectively. Figure 2 shows a schematic top view of the image scanner of Figure 1; and Figure 3 is a flow chart showing the steps used in the calibration process of the device for calibrating the horizontal starting point of a cat-scanning file of the present invention. Please Refer to FIGS. 1A-1C, which shows a schematic side view of a platform-type image scanner 100 that employs a scanning document horizontal starting point correction device of the present invention. As shown in FIG. 1A, this platform-type image scanner Sight 1 00 is roughly the same in mechanism as the conventional ones, including a movable scanning device 110 and a transparent glass window 120 for placing a document D. The scanning device 110 includes a light source 111 'and an optical scanning head ( scan head) 112, an optical lens system 113, and an optical sensor device 114. When the scanning device 110 is not used for scanning documents, it is parked on the right side, so that its scanning head 1 1 2 is in the original position (Home) on PQ. The optical sensing device 114 is composed of a plurality of charge coupling devices (CCD) sensing units (not shown in detail) in a linear array. The total number of ccp_ sensing units per unit length represents the scan Pointing device ... One resolution (resoluton), generally expressed in DPI (dot perϋ :). A single CCD sensing unit The paper scale is applicable to the Chinese National Standard (CNS) A4 specification (210X297mm) (please read the precautions on the back and then fill out this page),-° A7 B7 Employee consumption of the Central Standards Bureau of the Ministry of Economic Affairs Printed by the cooperative. The description of the invention () corresponds to a pixel on the mounted image. The general platform image scanner provides different degrees of resolution including 300 dpi, 600 dpi, 1,200 dpi, etc. In the embodiments of the present invention, 600 dpi will be used as an example for description. Since the structure and function of the scanning device 1 10 here are conventional technologies, they will not be described in detail in this specification. Please also Referring to FIG. 2, the characteristic part of the present invention is that the calibration paper (Calibration Paper) at the upper edge of the transparent glass window 120 is provided with two dark colored square calibration marks 301, 3 0 2, the dark color and the color of the surrounding body surface The greater the contrast between the two, the better, so that the CCD optical sensing device 114 can more easily detect the positions of the inner edges 301a, 302a of the calibration marks 301, 302. The two calibration marks 301 > 302 is set at the original position P of the scanning device 110. It is in the middle of the front edge of the document D (that is, the position p2 shown in the figure); and the horizontal centerlines of the two correction marks 301, 302 (that is, The position Pi) shown in the figure is the distance from the original position P |) of the scanning device 110. The distance from the front edge position p2 of the document is 3 > where the distance ^ 1 and the value are both Measured in advance and stored in the displacement controller (not shown) of the cat sweeping device 110. The document D to be scanned is placed on the transparent glass window 1 2 0 at the position shown by the dashed frame 1 2 1 in the second figure. The vertical center line is shown by the dashed straight line C. The width of the document D is', and the length is less than 1 °. In the embodiment of the present invention, the most commonly used document paper of 8 5x11 inches (Letter Slze) will be used as an example for illustration, even when L = U. The maximum horizontal scanning range of the cat sweeping device 110 is shown as the length S. -6-The size of this paper is applicable to the Chinese S-standard (CNS) A4 specification (210x297 mm) ¥ m —m · ¾-- (please read the precautions on the back and then fill out this page) Order—I If i A7 • B7 Printed by the Central Bureau of Standards of the Ministry of Economic Affairs. 5. Description of the invention () Before scanning the document D, the scanning device 110 must first perform a calibration procedure according to the present invention to find out the level of the document D. The coordinate position of the starting stick (that is, the pixel at the upper left corner of the dotted box 121 in Figure 2), and the optical response device 114 in the scanning device 110 corresponds to this horizontal starting point. The CCD sensing unit is the pixel point at the beginning of the scan a. The flow chart of this calibration procedure is shown in Figure 3. 3 Please refer to Figure 3 'Calibration procedure. After the scanner 100 is turned on in step 501, the step is performed. 502 'To move the scanning device 110 from the original position P〇 by a built-in distance' so that the scanning head 112 on the scanning device 110 is roughly aligned with the horizontal centerline position P on the two calibration marks 301-2, (As shown in Section 1B). Next, in steps 503 and 504, the CCD optical sensing device 114 in the scanning device 110 reads the reflection data on the two calibration marks 301 '3 0 2 and records the RGB values of each pixel. In 5 1 1, if the position of the CCD sensing unit on the inside edge 301a of the calibration mark 301 on the left in the array is the αth from the left, it represents the first CCD in the optical sensing device The horizontal (X-axis direction) distance between the sensing unit and the inner edge 301a of the calibration mark 301 includes a total number of CCD sensing units of <3 and in step 5 2 1 if it is detected that it is located on the right The position of the CCD sensing unit on the inside edge 302a of the correction mark 302 in the array is the first from the left, which represents the horizontal distance between the inside edges 3 0 1a and 302a of the two correction marks 3 〇1, 3 0 2 The number of pixel points contained in 4 is 4 = exempt · α. —-— ___ 一 Ί — The size of the paper depends on) AW (ΙΓ〇Χ291 ^) IIII I- n-(please read the precautions on the back before filling this page) ---- iT ------- The Ministry of Economic Affairs, Central Bureau of Standards and Staff of the Central Government Bureau of Consumer Cooperative Printing ΑΊ B7 i, invention description () Then in step 511 'in accordance with the following formula b-A i 2-W * (Resolution)! 2 Calculate the inside of the left calibration mark 301 The number of pixels included in the horizontal distance from the side line 301a to the horizontal starting point Ο of the document 'where b is the pixel points included in the horizontal distance from the inner side line 301a of the left calibration mark 301 to the horizontal starting point of the document The number of pixels; A is the number of pixels included in the horizontal distance 3 0 1a between the two correction marks 301 '302, 302a; W is the file width;
Resolution 爲光學感應裝置114所具有之解析度》 接著於步驟531中便可用下面公式： X = a b 計算出光學感應裝置140中之第一個CCD惑測單元至文件 D之水平起始點Ο之水平距離中所包含之像素點的個數。 若以=600 且文件紙張爲8.5x11吋爲例作說 明，如果經讀取二個校正標誌3 0 1 ’ 3 0 2上之反射資料 後得到乂 = 5,200個像素點且α = 20個像素點’貝 b = 5,200/2 - 8.5*600/2 =50 個像素點 進而可得： X =20 + 50 =70 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） ^^1 I I 訂 線 (婧先閲讀背面之注意事項再填寫本頁) A7 B7 五、發明説明（ 亦即光學感應裝置140中之左起第70個CCD感測單元爲文 件之第一個像素點》 接著於步驟532中指定光學感應裝置114上之第;c個 CCD感測單元爲掃瞄起始之像素點。再接著於步驟533 中，將掃瞄裝置110自位置P,移動內建之距離>^至文件 之前緣位置P2(如第1C圖所示）》此時便可進入步驟534 中，將掃瞄裝置110向前移動，開始對文件D進行掃瞄程 序》 本發明之掃瞄文件水平起始點之校正方法與裝置可僅在 單方向（即水平之X軸方向）作位置調整，因此可使影像掃 瞄器之光學感應裝置更快地定位出文件之水平起始點的位 置。 以上所述僅爲本發明之較佳實施例而已並非用以限 定本發明之範圍，凡其它未脫離本發明所揭示之精神下所 完成之等效改變或修飾均應包含在下述之專利範圍內- I^1TI----.41----- (請先閲讀背面之注意事項再填寫本頁) 經濟部中央標準局員工消費合作社印製 本紙張尺度適用中國國家標準（CNS ) Μ規格（210 X 297公釐）Resolution is the resolution of the optical sensing device 114. Then, in step 531, the following formula can be used: X = ab Calculate the horizontal starting point of the first CCD detection unit in the optical sensing device 140 to the file D The number of pixels included in the horizontal distance. If = 600 and the document paper is 8.5x11 inches as an example for illustration, if the reflection data on the two calibration marks 3 0 1 '3 0 2 is read, then = = 5,200 pixels and α = 20 pixels 'Bei b = 5,200 / 2-8.5 * 600/2 = 50 pixels and then available: X = 20 + 50 = 70 This paper scale is applicable to the Chinese National Standard (CNS) A4 specification (210X297 mm) ^^ 1 II Threading (Jing first read the precautions on the back and then fill out this page) A7 B7 V. Description of the invention (that is, the 70th CCD sensing unit from the left in the optical sensing device 140 is the first pixel of the document) Then follow In step 532, the c-th CCD sensing unit on the optical sensing device 114 is designated as the pixel point at which scanning starts. Then in step 533, the scanning device 110 is moved from the position P by the built-in distance> ^ To the front edge position P2 of the document (as shown in Fig. 1C) "At this point, you can enter step 534, move the scanning device 110 forward, and start the scanning process of the document D." The scanning document level of the present invention The starting point correction method and device can only adjust the position in one direction (that is, the horizontal X axis direction) Therefore, the optical sensor device of the image scanner can locate the horizontal starting point of the document faster. The above is only the preferred embodiment of the present invention and is not intended to limit the scope of the present invention. Equivalent changes or modifications completed without departing from the spirit disclosed by the present invention should be included in the following patent scope-I ^ 1TI ----. 41 ----- (please read the notes on the back before filling in This page) The paper printed by the Staff Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs applies the Chinese National Standard (CNS) M specifications (210 X 297 mm)