525368 A7 .五 經濟部智慧財產局員工消費合作社印製 7828twf.doc/002 發明說明（/) 本發明是有關於一種掃描灰階影像之方法及系統，且 特別是有關於一種利用現有之彩色掃描器掃描灰階影像之 方法及系統。 在現有的掃描器中有分黑白、灰階及彩色掃描器，而 之所以會有這樣的區別，是以掃描後所得之影像顏色而有 所區分。當然使用者仍可以用黑白掃描器掃描彩色影像， 但掃描後所得之影像會是黑白影像，依此類推，若是灰階 掃描器掃描彩色影像，則會是具有灰階的影像，但其表現 出來的影像色彩效果較黑白掃描器好。 除了上述之應用外，使用者亦可用彩色掃描器對黑白 或灰階影像進行掃描，當然彩色掃描器對單純爲黑白影像 的掃描處理較爲容易，因爲掃描所得之影像資料只有兩種 可能顏色存在，但在掃描灰階影像時，則因在黑白之間有 不同層級的灰階顏色（端視亮度値而定），是以在對灰階 影像進行掃描時必須進行彩色轉灰階的過程，但爲了使彩 色掃描器能對灰階影像進行掃描，使得彩色掃描器在設計 上必須增加其硬體之成本，或是增加其處理影像上的時 間。 例如，在習知之技術上，有單純增加彩色掃描器內部 的硬體設計來對掃描後所得之彩色影像資料轉爲灰階影像 資料，之後，再將轉換後得到的灰階影像資料傳送至主機 (HOST)端。此種增加硬體電路而達成掃描灰階影像之方 法的優點在於速度快、品質佳，但缺點確是必須付出硬體 製作上的成本。 3 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） --------------------訂---------線 (請先閱讀背面之注意事項再填寫本頁) 525368 7828twf.doc/002 A7 B7 五、發明說明（ 另外一種係利用主機端的軟體，將彩色掃描器掃描後 所得之彩色影像資料轉爲灰階影像資料。其優點係品質 佳，不需付出額外的硬體製作成本，但其缺點確是需處理 自彩色掃描器掃描後所傳輸之三倍大的影像資料（因爲需 傳輸每一個灰階圖點的R、G、B三原色亮度値資料），並 且需對傳輸進來的R、G、B三原色亮度値資料進行彩色轉 灰階的複雜運算，所以效率差。 還有一種習知彩色轉灰階之方法，係僅選擇R/G/B其 中一個管道作爲掃描影像的擺取裝置，其優點爲速度快、 不必付出額外的硬體製作成本，但其缺點係品質差。 其中，在執行彩色轉灰階的技術上皆需進行一段彩色 轉灰階的運算，其運算式如下：525368 A7. Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Five Ministry of Economic Affairs 7828twf.doc / 002 Description of the Invention (/) The present invention relates to a method and system for scanning grayscale images, and in particular to a method using existing color scanning Method and system for scanning gray-scale images by a scanner. There are black-and-white, gray-scale and color scanners in the existing scanners. The reason for this difference is that they are distinguished by the color of the image obtained after scanning. Of course, users can still scan color images with a black and white scanner, but the image obtained after scanning will be a black and white image, and so on. If a grayscale scanner scans a color image, it will be a grayscale image, but it will show The color effect of the image is better than that of a black and white scanner. In addition to the above applications, users can also scan black and white or grayscale images with a color scanner. Of course, it is easier to scan a black and white image with a color scanner, because only two possible colors exist in the scanned image data. , But when scanning grayscale images, because there are different levels of grayscale colors between black and white (depending on the brightness 値), the process of color to grayscale must be performed when scanning grayscale images. However, in order for the color scanner to scan grayscale images, the color scanner must be designed to increase the cost of its hardware or increase the time it takes to process the image. For example, in the conventional technology, there is a simple increase in the hardware design of the color scanner to convert the scanned color image data into grayscale image data, and then send the converted grayscale image data to the host. (HOST) side. The advantage of this method of adding hardware circuits to scan grayscale images is that it is fast and of good quality, but the disadvantage is that it must pay the cost of hardware production. 3 This paper size applies to China National Standard (CNS) A4 (210 X 297 mm) -------------------- Order --------- (Please read the precautions on the back before filling this page) 525368 7828twf.doc / 002 A7 B7 V. Description of the Invention (Another is to use the software on the host computer to convert the color image data obtained by the color scanner to grayscale Image data. Its advantages are high quality and no additional hardware production costs are needed, but its disadvantage is that it needs to process image data that is three times as large as scanned by the color scanner (because each grayscale image needs to be transmitted) Point R, G, B three primary color brightness (data), and the R, G, B three primary color brightness (data) need to perform a complex operation of color to gray scale, so the efficiency is poor. There is also a known color to gray scale The method is to select only one of the R / G / B channels as the scanning image pick-up device, which has the advantages of high speed and no additional hardware production costs, but its disadvantage is poor quality. Among them, performing color conversion Gray scale technology requires a color to gray scale calculation , Its expression is as follows:
Y=Cr*R+Cg*G+Cb*B 或是 Y=Cr*R，+Cg*G，+Cb*B’ 其中，Y爲灰階圖點的灰階亮度値； 原色係數部分·· Cr= 0.299，Cg= 0.587, CB= 0.114 ·’ R、G、B :係掃描過程中，彩色影像資料之亮度値； R，、G，、B’ ：係掃描過程中，經伽碼修正（Gamma Correction)後之彩色影像資料之亮度値。 是以，上述三種利用純硬體或純軟體或者是取R/G/B 其中一個管道作爲擷取裝置，即是要用來作爲實現上述之 彩色轉灰階的運算方法。但因習知三種方法各有其在速 度、品質、成本上的優缺點，是以如何取其優點而避其缺 4 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） --------------------訂---------線 I, (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 525368 A7 7 828twf.doc/002 五·、發明說明（/ ) 點，達到在速度、品質、成本上的均衡發展，即成爲本發 明之追求目標。 有鑒於此，本發明即提出一種掃描灰階影像之方法， 可以達到速度快、品質佳及不需耗費硬體製作上之成本。 此掃描灰階影像之方法包括：先下載三組伽馬表 (Gamma Table)至彩色掃描器，其中每一組伽馬表包括 數個索引位址及與每一個索引位址相對應之儲存空間，在 每一個儲存空間內係存放有關彩色轉灰階之彩色空間 (color space)轉換値。 在下載期間，可掃描灰階圖點以得到灰階圖點之數位 資料，在此數位資料中包括屬於灰階圖點之三個原色亮度 値，之後，將屬於灰階圖點之三個原色亮度値與相對應之 三組伽馬表中的索引位址作比對，得到與灰階圖點之三個 原色亮度値相同値之索引位址。 依此三個索引位址，取得屬於灰階圖點之彩色空間轉 換値’然後傳送至主機作兩次加法處理，得到有關灰階圖 點之灰階亮度値。 本發明又提出一種掃描灰階影像之系統，係有關於利 用彩色掃描器掃描灰階影像，以將灰階影像之亮度値傳送 至與彩色掃描器相連接之主機，其中在灰階影像中包括數 個灰階圖點，且在本系統中所使用之裝置及軟體皆係原本 在一般彩色掃描器及主機中皆具有之裝置及軟體。 在此掃描灰階影像之系統中包括：記憶體、緩衝區、 控制裝置及加法單元。 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） (請先閱讀背面之注意事項再填寫本頁) --------訂---------線I赢 經濟部智慧財產局員工消費合作社印製 經濟部智慧財產局員工消費合作社印製 525368 7828twf.doc/002 „ J\i B7 五、發明說明（y) 其中 < 記憶體，係存在於彩色掃描器中，用以儲存自 主機下載之三組伽馬表，其中在每一組伽馬表中包括數個 索引位址及與每一個索引位址相對應之儲存空間，另外，在 每一個儲存空間內皆係存放有關彩色轉灰階之彩色空間轉 換値。 緩衝區，係存在於彩色掃描器中且耦接於記憶體，用 以儲存至少一個灰階圖點在掃描過後已轉換成之數位資 料，在數位資料中包含有三個數位化原色亮度値，且一個 數位化原色亮度値對應一組伽馬表。 控制裝置，係存在於彩色掃描器中且耦接於記憶體及 緩衝區，用以將灰階圖點的三個數位化原色亮度値與相對 應之三組伽馬表中的索引位址作比對，且自與對應之索引 位址相對應之儲存空間內，取得灰階圖點之彩色空間轉換 値，並傳送與三個數位化原色亮度値相對應之彩色空間轉 換値至主機。 存在於主機中的加法單元，即會對自彩色掃描器所傳 送之有關灰階圖點之三個彩色空間轉換値，執行加法運 算，得到有關灰階圖點之灰階亮度値。 在本發明中，即是利用原本在彩色掃描器中即有之硬 體裝置進行彩色轉灰階運算式中的乘法部分，以得到三個 彩色空間轉換値，再利用原有在主機中即有的加法功能對 已得到的三個彩色空間轉換値進行兩次加法運算，使得本 發明可以達到速度快、品質佳及不需耗費硬體製作上之成 本即可達成掃描灰階影像之目的。 6 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） ------------· 11-----訂----I----線 w__w. (請先閱讀背面之注意事項再填寫本頁) 525368 A7 7828twf.doc/002 五、發明說明（^Τ) 爲讓本發明之上述和其他目的、特徵、和優點能更明 顯易懂，下文特舉較佳實施例，並配合所附圖式，作詳細 說明如下： 圖式之簡單說明： 第1圖繪示的是本發明之一流程圖； 第2圖繪示的是本發明之一方塊圖；以及 第3圖繪示的是本發明彩色掃描器中記憶體之一示意 圖。 標號說明 200 :彩色掃描器 210 ·電何稱合裝置 220 :類比/數位轉換器 230 :伽碼修正電路 240 :緩衝區 242 :數位資料 244 :數位化R原色亮度値 246 :數位化G原色亮度値 248 :數位化B原色亮度値 250 :控制裝置 260 :記憶體 300 :主機 302 :驅動程式 步驟slOO至步驟s 108係本發明之一實施步驟 較佳實施例 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 525368 7828twf.doc/002 A7 B7 五、發明說明（6) 請參照第1圖、第2圖及第3圖，其繪示的是依照本 發明一較佳實施例的一種掃描灰階影像之方法，係有關於 利用彩色掃描器200掃描灰階影像之方法，其中在灰階影 像中包括數個灰階圖點，其組成之色素皆爲灰階色素，但 因每一個灰階圖點係有8個位元（bit)，即一個位元組 (byte)，來處理其亮度値之強度級數，而彩色掃描器200 在處理一個圖點時，則是以3個byte，分別爲r、g、B三 原色來處理其亮度値之強度級數，是以以彩色掃描器200 對灰階影像進行掃描，可使掃描出的灰階影像爲高品質的 灰階影像。 但在追求高品質的過程中，可能會造成彩色掃描器在 製作成本上的增加，或是使彩色掃描器在掃描過程中的速 度降低，是以透過本發明之掃描灰階影像之方法中，即可 在追求高品質的過程中，使得彩色掃描器在掃描過程中的 速度不致降低，甚而可比習知以彩色掃描器掃描灰階影像 的速度上更快速，且亦不會導致彩色掃描器在製作成本上 的增加。 在本發明之掃描灰階影像之方法步驟中包括：步驟 slOO,自與彩色掃描器200相連接之主機300中的掃描器 驅動程式302，下載三組伽馬表（Gamma Table)至彩色掃 描器2〇〇中的記憶體260，如圖3中在記憶體260中的伽 馬表262、伽馬表264及伽馬表266。 其中，在每一組伽馬表中包括數個索引位址及與每一 個索引位址相對應之儲存空間，而在每一個儲存空間內係 8 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） 賴 " -----------------I--訂----I----^_wl (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 525368 7828twf.doc/002 A7 R7 &、發明說明（q) 存放有關彩轉灰階之彩色空間（colorspace)轉換値。 所謂的彩色空間轉換値，係利用原色係數乘上預設原 色亮度値而得到。其中，原色係數係一個針對三原色有關 彩色轉灰階的固定値，分別爲Cr=(K299，Cg= 0.587，Cb = 0.114。而預設原色亮度値的強度級數，則是依照主機300 內部的設定而有所改變，亦即當主機300內部係設定全彩 (full color)模式，則每一個原色皆會以8個位元來強度 級數種類，是以每一個原色皆會被分割成256種強度級 數。 在圖3中儲存在記憶體260中的三原色伽馬表（分別 爲紅、綠、藍三原色伽馬表），即可看出各個伽馬表的儲 存空間數量係與主機300內部的預設原色亮度値強度級數 成正比關係，也就是一個強度級數會佔據一個儲存空間， 而又因爲一個索引位址對應一個儲存空間，是以當主機300 內部將每一原色的強度級數分割成256種，則相對的在每 一個伽馬表中就會有256個索引位址及儲存空間用來指定 及儲存256個彩色空間轉換値。 附帶一提的是，因爲彩色掃描器在全彩模式下係以24 個位元來處理三原色的亮度値，是以以這24個位元可組合 出16,777,216種亮度値強度級數（即爲二的二十四次方）， 而這也遠比只能利用一個管道（channel)，即8個位元， 對灰階影像進行掃描的品質高出許多。 而當在進行步驟slOO的下載伽馬表動作時，亦可進行 步驟sl〇2的掃描灰階圖點動作，以得到經轉換後儲存在緩 ^纸張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） (請先閱讀背面之注意事項再填寫本頁) -va Γ 經濟部智慧財產局員工消費合作社印製 經濟部智慧財產局員工消費合作社印製 525368 7 82 8twf.doc/002 幻 ____ B7 五、發明說明（汶） 衝區240的數位資料242，當然在緩衝區240中儲存的數 位資料並不只有數位資料242而已，但爲簡化說明，以一 筆數位資料中所包含的三個數位化原色亮度値爲例作說 明。其中，在數位資料242中包含數位化R原色亮度値 244、數位化G原色亮度値246及數位化B原色亮度値248 三個數位化原色亮度値，且一個數位化原色亮度値對應一 組伽馬表，分別爲伽馬表262、伽馬表264及伽馬表266。 在步驟sl02得到R、G、B三個數位化原色亮度値後， 控制裝置25〇即會在步驟sl〇4中，將掃描灰階圖點所得之 三個數位化原色亮度値與相對應之三組伽馬表中的索引位 址作比對。在本實施例中係假設三個數位化原色亮度値分 別係R : 116，G : 85，B : 90，作爲掃描得到之三個數位 化原色亮度値，是以控制裝置250即會參考相對應的三組 伽馬表，並利用掃描得到之三個數位化原色亮度値比對三 組伽馬表的索引位址，之後當在步驟sl〇6，找到與三個數 位化原色亮度値相同値的三個索引位址時，就可自相對應 於索引位址之儲存空間內，取得屬於灰階圖點的三個彩色 空間轉換値，而在本實施例，可由與R原色相對應之伽馬 表262中，知道R原色轉灰階的彩色空間轉換値爲34.68 (即0.299*116)，由與G原色相對應之伽馬表264中， 知道G原色轉灰階的彩色空間轉換値爲49.90 (即 0·587*85 )，而由與B原色相對應之伽馬表266中，知道 Β原色轉灰階的彩色空間轉換値爲ι〇·26 (即〇114*9〇)。 當控制裝置250經由步驟sl〇6知道灰階圖點的三個彩 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） (請先閱讀背面之注意事項再填寫本頁) ----I ---訂·--------. 525368 7828twf.doc/002 A7 B7 五、發明說明（y) 色空間轉換値後，即會將這三個彩色空間轉換値傳送至主 機300，而主機300即會在步驟sl08中，對屬於灰階圖點 的三個彩色空間轉換値執行兩次加法運算，得到有關灰階 圖點之灰階亮度値爲94.84 (即將34·68+49.90+10.26)。 在上述實施例中的三個數位化原色亮度値（116、85、 90)係未經伽碼修正（Gamma Correction)的亮度値，即 爲Y=Cr*R+Cg*G+Cb*B的運算式中的R、G、B亮度値。 但有時使用者會利用主機300中的掃描軟體進行預設亮度 値的修改，例如增加三原色的預設亮度値或是減少三原色 的預設亮度値，當使用者進行這樣的修改時，則主機300 會透過驅動程式302將修改的指令送至伽碼修正電路 230,伽碼修正電路230就會對掃描得到的三個數位化原色 亮度値進行亮度値修正，此即爲伽碼修正（Gamma Correction)，即在運算式 Y=Cr*R，+Cg*G’+Cb*B，中的 R’、 G’、B’是經伽碼修正後之彩色影像資料之亮度値。 另請再次參照第2圖，其繪示的是依照本發明一較佳實 施例的一種掃描灰階影像之系統，在此掃描灰階影像之系 統中的裝置皆係原本存在於一般彩色掃描器中就有的裝 置。 其中，電荷親合裝置（Charge Couple Device ;簡稱 CCD) 210，係用以掃描灰階影像以將得到之感測到的光強 度轉換成一類比訊號，然後類比/數位轉換器220會將類比 訊號轉換成數位訊號，而若使用者有修改主機300內部的預 設亮度値，則經轉換後之數位化原色亮度値就需經伽碼修 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） -------------------訂---------線_ (請先閱讀背面之注咅？事項再填寫本頁) 經濟部智慧財產局員工消費合作社印製 525368 7828twf.doc/002 pj B7 五·、發明說明（ (請先閱讀背面之注意事項再填寫本頁) 正電路230的亮度値修正，若使用者沒有修改主機300內部 的預設亮度値，則轉換後的數位化原色亮度値就直接暫存 於緩衝區240中。 而在圖2中的緩衝區240、控制裝置250、記憶體260亦 是原本就存在於一般彩色掃描器的裝置，其中，控制裝置 250即爲特殊應用積體電路（Application Specified Integrated Circuit ;簡稱ASIC)，而這些裝置在進行掃描 灰階影像的功能上已在上述實施例中作以說明，在此不加 贅述。 而加法單元，即是對屬於灰階圖點的三個彩色空間轉 換値執行兩次加法運算的單元，此單元所執行的功能即爲 主機300中的驅動程式302其中的一項功能。 綜上所述，本發明的優點： 1·不需經由新設計的電路及軟體即可完成掃描灰階影 像的功能。 經濟部智慧財產局員工消費合作社印製 2·不需將所有需進行運算的步驟皆交由主機的驅動程 式來運作，使得不需將三倍的影像資料皆傳輸至主機，主 機只需進行簡單的加法運算，省卻資料傳輸時間及浮點乘 法運算時間。 3·可利用所有的R、G、B管道（channel)進行影像的 處理，使得掃描後所得之灰階影像的品質優於只用〜個管 道進行影像處理的彩色掃描器。 雖然本發明已以較佳實施例揭露如上，然其並非用以 限定本發明，任何熟習此技藝者，在不脫離本發明之精神 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） 525368 A7 經濟部智慧財產局員工消費合作社印製 7828twf.doc/002 五、發明說明（i丨） - 和範圍內，當可作各種之更動與潤飾，因此本發明之保護 範圍當視後附之申請專利範圍所界定者爲準。 13 ---丨丨丨丨丨訂---------線 (請先閱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（210 X 297公釐）Y = Cr * R + Cg * G + Cb * B or Y = Cr * R, + Cg * G, + Cb * B 'where Y is the grayscale brightness of the grayscale point 値; the primary color coefficient part ... Cr = 0.299, Cg = 0.587, CB = 0.114 · 'R, G, B: the brightness of the color image data during scanning; R, G, B': the gamma correction during scanning ( Brightness of color image data after Gamma Correction). Therefore, the above three use pure hardware or pure software or take one of the R / G / B channels as the capture device, which is to be used as the calculation method to achieve the above-mentioned color to grayscale. However, because the three methods are known, each has its advantages and disadvantages in speed, quality, and cost. How to take advantage of them to avoid their shortcomings. 4 This paper size applies the Chinese National Standard (CNS) A4 specification (210 X 297 mm)- ------------------- Order --------- Line I, (Please read the notes on the back before filling this page) Intellectual Property Bureau of the Ministry of Economic Affairs Printed by the Employee Consumption Cooperative 525368 A7 7 828twf.doc / 002 Fifth, the invention description (/) point, to achieve a balanced development in speed, quality, and cost, has become the pursuit of the present invention. In view of this, the present invention proposes a method for scanning grayscale images, which can achieve fast speed, good quality, and no cost in terms of hardware production. The method for scanning grayscale images includes: first downloading three sets of gamma tables to a color scanner, where each set of gamma tables includes several index addresses and a storage space corresponding to each index address In each storage space, the color space conversion 有关 of color to gray scale is stored. During downloading, you can scan the grayscale image points to obtain the digital data of the grayscale image points. This digital data includes the three primary colors of the grayscale image points. Then, the three primary colors of the grayscale image points will be included. The brightness 値 is compared with the corresponding index addresses in the three sets of gamma tables to obtain the index addresses which are the same as the three primary color brightness 点 of the grayscale image points. According to these three index addresses, the color space conversion 属于 ′ belonging to the grayscale image points is obtained and then transmitted to the host for two addition processes to obtain the grayscale brightness 値 of the grayscale image points. The present invention also proposes a system for scanning grayscale images, which relates to scanning a grayscale image by using a color scanner to transmit the brightness of the grayscale image to a host connected to the color scanner. The grayscale image includes Several grayscale map points, and the devices and software used in this system are all devices and software originally found in general color scanners and hosts. The system for scanning gray-scale images includes: memory, buffer, control device and addition unit. This paper size applies to China National Standard (CNS) A4 specification (210 X 297 mm) (Please read the precautions on the back before filling this page) -------- Order --------- Online I printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs printed 525368 7828twf.doc / 002 „J \ i B7 V. Description of the invention (y) where < memory, which exists in The color scanner is used to store three sets of gamma tables downloaded from the host. Each set of gamma tables includes several index addresses and a storage space corresponding to each index address. In addition, in each A storage space is used to store the color space conversion related to color to grayscale. Buffer, which exists in the color scanner and is coupled to the memory, is used to store at least one grayscale image point that has been converted into The digital data includes three digitized primary color luminances 値, and one digitized primary color luminance 値 corresponds to a group of gamma tables. The control device exists in the color scanner and is coupled to the memory and the buffer. To map the grayscale The three digitized primary color luminances are compared with the corresponding index addresses in the three sets of gamma tables, and the color space conversion of the grayscale points is obtained from the storage space corresponding to the corresponding index addresses.値, and transmit the color space conversion corresponding to the three digitized primary color luminances 値 to the host. The addition unit existing in the host will translate the three color spaces of the grayscale image points transmitted from the color scanner. Convert 値 and perform the addition operation to obtain the gray-scale brightness 有关 of the gray-scale graph points. In the present invention, the multiplication part of the color-to-gray-level calculation formula is performed by using a hardware device originally available in a color scanner. To obtain three color space conversions 値, and then use the existing addition function existing in the host to perform two addition operations on the three color space conversions 得到 that have been obtained, so that the present invention can achieve fast speed, good quality and no It takes the cost of hardware production to achieve the purpose of scanning grayscale images. 6 This paper size is applicable to China National Standard (CNS) A4 specifications (210 X 297 mm) ------------ · 11 ----- Order ---- I ---- line w__w. (Please read the notes on the back before filling out this page) 525368 A7 7828twf.doc / 002 5. Description of the Invention (^ Τ) The above and other objects, features, and advantages of the invention can be more clearly understood. The preferred embodiments are described below in detail with the accompanying drawings as follows: A brief description of the drawings: FIG. 1 shows A flowchart of the present invention; FIG. 2 shows a block diagram of the present invention; and FIG. 3 shows a schematic diagram of a memory in the color scanner of the present invention. Reference numeral 200: Color scanner 210 · What's called a device 220: Analog / digital converter 230: Gamma correction circuit 240: Buffer 242: Digital data 244: Digitized R primary color brightness 値 246: Digitized G primary color brightness 値 248: Digitized B primary color brightness 値250: control device 260: memory 300: host 302: driver steps s100 to s108 are one of the implementation steps of the present invention. The preferred embodiment of this paper is the Chinese National Standard (CNS) A4 specification (210 X 297 mm). ) -------------------- Order --------- line (please read the back first Please fill in this page for further information) Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 525368 7828twf.doc / 002 A7 B7 V. Description of the invention (6) Please refer to Figure 1, Figure 2, and Figure 3. It is a method for scanning grayscale images according to a preferred embodiment of the present invention. The method relates to a method for scanning grayscale images by using the color scanner 200. The grayscale image includes several grayscale image points. The pigments are all gray-scale pigments, but because each gray-scale image point system has 8 bits, that is, a byte, to process the intensity level of its brightness, and the color scanner 200 When processing a picture point, the intensity level of the brightness 値 is processed with 3 bytes, which are the three primary colors of r, g, and B. The grayscale image is scanned with the color scanner 200, which can scan out Grayscale images are high-quality grayscale images. However, in the pursuit of high quality, it may cause an increase in the production cost of the color scanner or reduce the speed of the color scanner during the scanning process. In the method for scanning grayscale images through the present invention, That is, in the pursuit of high quality, the speed of the color scanner in the scanning process will not be reduced, and even faster than the speed of scanning grayscale images with the color scanner, and it will not cause the color scanner to Increase in production costs. The method steps of scanning the grayscale image of the present invention include: Step S100, downloading three sets of Gamma Tables to the color scanner from the scanner driver 302 in the host computer 300 connected to the color scanner 200 The memory 260 in 2000 is the gamma table 262, the gamma table 264, and the gamma table 266 in the memory 260 in FIG. Among them, each group of gamma tables includes several index addresses and storage space corresponding to each index address, and each of the storage spaces is 8 paper standards applicable to Chinese National Standard (CNS) A4 specifications. (210 X 297 mm) Lai " ----------------- I--Order ---- I ---- ^ _ wl (Please read the notes on the back first (Fill in this page again) Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 525368 7828twf.doc / 002 A7 R7 & Description of Invention (q) Stores the color space conversion 有关 for color to gray scale. The so-called color space conversion 値 is obtained by multiplying the primary color coefficient by the preset primary color brightness 値. Among them, the primary color coefficient is a fixed 値 for the three primary colors related to color to grayscale, respectively Cr = (K299, Cg = 0.587, Cb = 0.114. And the intensity level of the preset primary color brightness 値 is according to the internal of the host 300 The setting is changed, that is, when the full color mode is set inside the host 300, each primary color will be 8-bit intensity level type, so that each primary color will be divided into 256 The three primary color gamma tables (red, green, and blue primary color gamma tables stored in the memory 260 in FIG. 3) can be seen that the amount of storage space of each gamma table is the same as that of the host 300. The internal preset primary color brightness 値 intensity level is directly proportional, that is, an intensity level will occupy a storage space, and because an index address corresponds to a storage space, when the host 300 internally changes the intensity of each primary color The number of stages is divided into 256 types, and there will be 256 index addresses and storage spaces in each gamma table to specify and store 256 color space conversions. Incidentally, because of color scanning In full-color mode, the processor uses 24 bits to process the brightness of the three primary colors, so that these 24 bits can be combined to 16,777,216 brightness 値 intensity levels (that is, the power of two to the twenty-fourth). This is also far better than scanning a grayscale image using only one channel, that is, 8 bits. When performing the download of the gamma table in step sl100, step sl can also be performed. 〇2 Scan the grayscale dots to obtain the converted and stored in the buffer ^ Paper size applies Chinese National Standard (CNS) A4 specification (210 X 297 mm) (Please read the precautions on the back before filling this page ) -va Γ Printed by the Employees 'Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs Printed by the Employees' Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 525368 7 82 8twf.doc / 002 Magic ____ B7 V. Description of the Invention (Wen) Digital Data of Red Zone 240 242 Of course, the digital data stored in the buffer 240 is not only the digital data 242, but to simplify the description, the three digitalized primary color brightness values included in a piece of digital data are taken as an example. Among them, the digital data 242 Medium bag Digitized R primary color brightness 値 244, Digitized G primary color brightness 値 246 and Digitized B primary color brightness 値 248 Three digitized primary color brightness 値, and one digitized primary color brightness 値 corresponds to a group of gamma tables, which are respectively gamma tables 262, Gamma table 264, and Gamma table 266. After obtaining three digitized primary color luminances R, G, and B in step sl02, the control device 25 will scan the grayscale image points in step sl104. The three digitized primary color luminances 比 are compared with the corresponding three sets of index addresses in the gamma table. In this embodiment, it is assumed that the three digitized primary color luminances 系 are R: 116, G: 85, B: 90, as the three digitalized primary color luminances obtained by scanning, the control device 250 will refer to the corresponding three sets of gamma tables, and compare the three digitalized primary color luminances obtained by scanning with the three groups of gammas. The index address of the horse watch, and then in step 106, when three index addresses with the same brightness as the three digitized primary colors are found, the storage space corresponding to the index address can be obtained from the storage space corresponding to the index address. The three color spaces of the points of the grayscale graph are transformed. In this embodiment, from the gamma table 262 corresponding to the R primary colors, it is known that the color space conversion of the R primary colors to gray scales is 34.68 (that is, 0.299 * 116). From the gamma table 264 corresponding to the G primary colors, Knowing the color space conversion G of the G primary color to gray scale is 49.90 (ie, 0.587 * 85), and from the gamma table 266 corresponding to the B primary color, knowing the color space conversion of the B primary color to gray scale 値 is ι. -26 (i.e., 114 * 9). When the control device 250 knows that the three color paper sizes of the gray scale dots are applicable to the Chinese National Standard (CNS) A4 (210 X 297 mm) via step s106, (please read the precautions on the back before filling this page) ---- I --- Order · --------. 525368 7828twf.doc / 002 A7 B7 V. Description of the invention (y) After color space conversion, these three color spaces will be converted. Send to the host 300, and in step sl08, the host 300 performs three addition operations on the three color spaces belonging to the grayscale map points, and obtains the grayscale brightness of the grayscale map points, which is 94.84 (about 34 68 + 49.90 + 10.26). In the above embodiment, the three digitized primary color luminances (116, 85, 90) are luminances without gamma correction (Gamma Correction), that is, Y = Cr * R + Cg * G + Cb * B R, G, B brightness 値 in the expression. However, sometimes the user will use the scanning software in the host computer 300 to modify the preset brightness, such as increasing the default brightness of the three primary colors, or reducing the preset brightness of the three primary colors. When the user makes such a modification, the host will 300 will send the modified instruction to the gamma correction circuit 230 through the driver 302, and the gamma correction circuit 230 will correct the brightness and brightness of the three digitized primary colors obtained by scanning. This is the Gamma Correction. ), That is, in the expression Y = Cr * R, + Cg * G '+ Cb * B, R', G ', and B' are the brightness 値 of the color image data after gamma correction. Please also refer to FIG. 2 again, which shows a system for scanning grayscale images according to a preferred embodiment of the present invention. The devices in the system for scanning grayscale images are originally present in general color scanners. There is a device in it. Among them, a Charge Couple Device (CCD) 210 is used to scan a grayscale image to convert the obtained light intensity into an analog signal, and then the analog / digital converter 220 converts the analog signal Into a digital signal, and if the user has modified the default brightness 値 inside the host 300, the converted digitized primary color brightness 需 will need to be gamma-modified. The paper size applies the Chinese National Standard (CNS) A4 specification (210 X 297 mm) ------------------- Order --------- line_ (Please read the note on the back? Matters before filling this page) Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs 525368 7828twf.doc / 002 pj B7 V. Description of the invention ((Please read the precautions on the back before filling this page) Brightness 値 correction of the positive circuit 230, if the user has not modified The preset brightness 値 in the host 300 is directly stored temporarily in the buffer 240. The buffer 240, the control device 250, and the memory 260 in FIG. 2 also exist originally. In a general color scanner device, the control device 250 is Application Specified Integrated Circuit (ASIC for short), and the function of these devices to scan grayscale images has been described in the above embodiment, and will not be repeated here. The addition unit is the The unit that performs three additions of three color space conversion points that belong to the grayscale graph points, and performs the function of this unit is one of the functions of the driver 302 in the host 300. In summary, the advantages of the present invention : 1. It can complete the function of scanning gray-scale images without the need of newly designed circuits and software. Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs 2. It is not necessary to send all the steps that need to be calculated to the driver of the host Operation, so that it is not necessary to transfer three times the image data to the host, the host only needs to perform simple addition operations, saving data transmission time and floating-point multiplication operation time. 3. All R, G, B channels can be used ( channel) to perform image processing, so that the quality of the grayscale image obtained after scanning is better than that of a color scanner that uses only ~ channels for image processing. Although the present invention has been disclosed in the preferred embodiment as above, it is not intended to limit the present invention. Any person skilled in the art can apply the Chinese National Standard (CNS) A4 specification (210 X 297) without departing from the spirit of the present invention. (Mm) 525368 A7 Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 7828twf.doc / 002 V. Description of the invention (i 丨)-Within the scope, it can be modified and retouched. Therefore, the scope of protection of the present invention is deemed The appended application patent shall prevail. 13 --- 丨 丨 丨 丨 丨 Order --------- line (Please read the precautions on the back before filling this page) This paper size applies to China National Standard (CNS) A4 (210 X 297) %)