548955 五、發明說明（/ ) 本發明是有關於一種補償拉鍊影像的方法，且特別是 有關於一種利用κ値補償拉錬影像及計算κ値的方法。 交錯式感應器（Stagger* CCD)的掃描器的系統方塊圖，可 由第1圖所繪示。由此圖可知，掃描器100與一台電腦主 機150相連接。而在掃描器100中則包括了每種顔色具有 一個主線與一個副線的一個交錯式感應器11 0，一個應用特 定積體電路（application specific integrated circuit，簡稱 ASIC)120，一個影像補償緩衝區130以及一個輸入/輸出介 面〗40。其中，掃描器100在掃描之前會先對掃描文件進行 補償的動作，並藉此得到進行影像補償時所需的影像補償 參數，而此影像補償參數則儲存在電腦主機150之中。 當交錯式感應器110要進行任何一部份文件的掃描 時，會先從電腦主機15〇之中，將對應於這部分文件的一 個部分影像補償參數，經過輸入/輸出介面140傳輸到影像 補償緩衝區130之中。而後，由交錯式感應器110以間隔 式掃描所得的間隔掃描影像，會根據由影像補償緩衝區130 傳送而來的部分影像補償參數，經由ASIC(120)來進行影像 校正的工作。而校正過後所得的校正影像，則經過輸入/輸 出介面H0而傳輸到電腦主機〗5〇中儲存起來。 但是當使用具有交錯式感應器的掃描器掃描文件 時，由於交錯式感應器之主線與副線的線距很短，所以主 線會受到副線之反射光影響，反之，主線之反射光也會影 響副線。因此使文件的真實影像（如第2圖繪示），在使用具 有交錯忒感應器的掃描器掃描後，會產生所謂的拉鍊 本紙張尺度適用中國國家標準（CNS)A4規格（210 x 297公釐） -----------裝—— (請先閱讀背面之注意事項再填寫本頁) · --線· 經濟部智慧財產局員工消費合作社印製 548955 7878twf.doc/009 A7 B7 五、發明說明（V) (zipper)影像（如第3圖所示）。尤其當掃描有黑白交接的文 件時，拉鍊現象會更爲明顯，而使掃描的影像與實際的影 像產生誤差。而習知尙無提出對拉鍊現象進行補償的方 法。 有鑒於此，本發明提出一種利用K値補償拉鍊影像及計 算K値的方法。使拉錬影像可藉由參考領先緣（leading edge reference，簡稱LER)線所計算出之交錯式感應器的主線（如 奇像素）與副線(如偶像素）互相影響的K値，而得到恰當的補 償。 爲達成上述目的，本發明提出一種利用K値補償拉鍊影 像方法，其適用於使用每種顏色具有主線與副線之交錯式 感應器的掃描器，藉以對文件進行掃描，包括下列步驟： 首先，判斷第m(m爲正整數)線之第n(n爲正整數)個原始像素 是否爲主線掃描所得。接著，如果第m線之第n個原始像素 爲主線掃描所得時，則第m線之第η個原始像素，將補償爲 第m線之第η個補償像素，其中第m線之第η個補償像素爲第 m線之弟η個原始像素減去第（m-k)( k爲該主線與該副線間 的線距且爲正整數）線之第η-1個原始像素與第（m-k)線之第 n+1個原始像素之和與K値相乘所得之積後所得的値。而如 果第m線之第η個原始像素爲副線掃描所得時，則第㈤線之 第η個原始像素，將補償爲第m線之第η個補償像素，其中第 m線之弟η個補彳員像素爲第m線之第η個原始像素減去第 (m+k)線之第η-1個原始像素與第（m+k)線之第η+1個原始像 素之和與Κ値相乘所得之積後所得的値。 4 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* 經濟部智慧財產局員工消費合作社印製 548955 A7 B7 7878twf.d〇c/009 五、發明說明（>]) 在本發明的一較佳實施例中，κ値是爲常數，且爲主 線與副線互相影響的比例常數。另外，K値是利用參考領先 緣線所計算得出的値。 本發明還提出一種利用參考領先緣線計算K値的方 法，其適用於使用每種顏色具有主線與副線之交錯式感應 器的掃描器，藉以對文件進行掃描，包括下列步驟：如果 參考領先緣線爲爲第m線，第m線之第η個原始像素爲主線 掃描所得時，將第m線之第η個原始像素減去第m線之第η+1 個原始像素，除以第（m-k)線之第η-1個原始像素及第（m-k) 線之第η+1個原始像素之和，而得到1^ (第n個K値）。而如果 參考領先緣線爲爲第m線，第m線之第η個原始像素爲副線 掃描所得時，將第m線之第η個原始像素減去第!!!線之第η+ι 個原始像素’除以弟（m+k)線之弟n_ 1個原始像素及第（m+k) 線之第n+1個原始像素之和，而得到Kn (第η個K値）。之後， 重複上述步驟，直到文件掃描完成，然後將1^(第1個Κ値）， Κ3(第2個Κ値），Κ5(第5個Κ値），…，以及κη的和除以一X， 其中該X爲Χ=(η+1)/2，且X大於0，而得到κ値，用以補償 拉鍊影像。 綜上所述，本發明藉由Κ値補償拉鍊影像及計算κ値的 方法’而使拉鍊現象得到恰當的補償。因此，當使用交錯 式感應器的掃描器對文件進行掃描時，本發明可以使掃描 所得的影像與真實的影像幾乎完全相同。 爲讓本發明之上述和其他目的、特徵、和優點能更明 本紙張尺度適用中國國家標準（CNS)A4規格（210x297公釐） (請先閱讀背面之注意事項再填寫本頁) --------訂-----— II · 經濟部智慧財產局員工消費合作社印製 548955 A7 B7 878twf.doc/009 五、發明說明) 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圖繪示的是交錯式感應器的掃描器的系統方塊 圖； 第2圖繪示的是文件的真實影像； 第3.圖繪示的是使用交錯式感應器的掃描器掃描文件 時，所產生的拉錬影像； 第4A圖繪示的是根據本發明之一較佳實施例之利用 參考領先緣線計算K値的流程圖； 第4B圖繪示的是根據本發明之另一較佳實施例之利 用參考領先緣線計算K値的流程圖；以及 第5圖繪示的是根據本發明之一較佳實施例之利用K 値補償拉鍊影像的流程圖。548955 V. Description of the invention (/) The present invention relates to a method for compensating a zipper image, and more particularly, to a method for compensating a pull image using κ 値 and calculating a κ 値. The system block diagram of the scanner of the Stagger * CCD can be shown in Figure 1. It can be seen from this figure that the scanner 100 is connected to a computer host 150. The scanner 100 includes an interleaved sensor 110 having one main line and one sub line for each color, an application specific integrated circuit (ASIC) 120, and an image compensation buffer. 130 and an input / output interface. The scanner 100 compensates the scanned file before scanning, and obtains the image compensation parameters required for image compensation. The image compensation parameters are stored in the computer 150. When the interleaving sensor 110 is to scan any part of the document, it will first transfer a part of the image compensation parameters corresponding to this part of the document from the computer host 15 to the image compensation through the input / output interface 140. In buffer 130. Then, the interval scanning image obtained by the interlaced sensor 110 at the interval scanning will perform the image correction work through the ASIC (120) according to some image compensation parameters transmitted from the image compensation buffer 130. The corrected image obtained after the correction is transmitted to the computer host through the input / output interface H0 and stored in 50. However, when scanning a document with a staggered sensor, the main line and the sub line have a short distance, so the main line will be affected by the reflected light from the sub line. Otherwise, the reflected light from the main line will also be affected. Affects the secondary line. Therefore, the actual image of the document (as shown in Figure 2) will be produced after scanning with a scanner with an interlaced chirp sensor. This will produce a so-called zipper. (Li) ----------- install—— (Please read the precautions on the back before filling in this page) · --- Line · Printed by the Consumers' Cooperative of Intellectual Property Bureau of the Ministry of Economic Affairs 548955 7878twf.doc / 009 A7 B7 V. Description of the invention (V) (zipper) image (as shown in Figure 3). Especially when scanning documents with black and white transfer, the zipper phenomenon will be more obvious, which will cause errors between the scanned image and the actual image. However, Xi Zhiyuan did not propose a method to compensate for the zipper phenomenon. In view of this, the present invention proposes a method for compensating a zipper image using K 値 and calculating K 値. The K 錬 image can be obtained by using the leading edge reference (LER) line to calculate the K 値 between the main line (such as odd pixels) and the auxiliary line (such as even pixels) of the interleaved sensor. Appropriate compensation. In order to achieve the above object, the present invention proposes a method for compensating a zipper image using K 値, which is suitable for scanning a document using an interlaced sensor with a main line and a sub line of each color to scan a document, including the following steps: First, Determine whether the nth (n is a positive integer) original pixel of the mth (m is a positive integer) line is obtained by scanning the main line. Next, if the n-th original pixel of the m-th line is obtained by scanning the main line, the n-th original pixel of the m-th line will be compensated as the n-th compensated pixel of the m-th line, of which the n-th The compensation pixel is the η original pixel of the m-th line minus the (mk) (k is the line distance between the main line and the sub-line and is a positive integer) the η-1th original pixel and the (mk) line値 obtained by multiplying the sum of the (n + 1) th original pixel of the line by K 値. And if the n-th original pixel of the m-th line is obtained by scanning the sub-line, the n-th original pixel of the y-th line will be compensated as the n-th compensated pixel of the m-th line, of which the n-th brother of the m-th line The patch pixel is the sum of the n-th original pixel of the m-th line minus the (n + 1) -th original pixel of the (m + k) -th line and the (n + 1) -th original pixel of the (m + k) -th line The 値 obtained by multiplying the product of K 値. 4 This paper size applies to Chinese National Standard (CNS) A4 (210 X 297 mm) (Please read the precautions on the back before filling this page) -------- Order -------- -Line * Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 548955 A7 B7 7878twf.doc / 009 V. Description of the Invention (>)) In a preferred embodiment of the present invention, κ 値 is constant and The proportionality constant that affects the main and auxiliary lines. In addition, K 値 is a 値 calculated using a reference leading edge. The present invention also proposes a method for calculating K 値 using a reference leading edge, which is suitable for scanning a document by using a scanner with an interlaced sensor of a main line and a sub line of each color, including the following steps: The edge line is the m-th line, and the n-th original pixel of the m-th line is obtained by scanning the main line. The sum of the (nk) th original pixel of the (mk) line and the (n + 1) th original pixel of the (mk) line yields 1 ^ (nth K 値). If the reference leading edge line is the m-th line, and the n-th original pixel of the m-th line is obtained by scanning the sub-line, the n-th original pixel of the m-th line is subtracted from the n-th original line of the !!! line. Divide the original pixels' by the sum of the n_1th original pixel of the (m + k) line and the (n + 1) th original pixel of the (m + k) th line to obtain Kn (nth K 値). After that, the above steps are repeated until the scanning of the file is completed, and then the sum of 1 ^ (the first κ 値), Κ3 (the second κ 値), κ5 (the fifth Κ 値), ..., and κη is divided by one X, where X is X = (η + 1) / 2, and X is greater than 0, and κ 値 is obtained to compensate the zipper image. In summary, the present invention appropriately compensates the zipper phenomenon by KK's method of compensating the zipper image and the method of calculating κ 値. Therefore, when scanning a document with a scanner using an interlaced sensor, the present invention can make the scanned image almost identical to the real image. In order to make the above and other objects, features, and advantages of the present invention clearer, the paper size applies the Chinese National Standard (CNS) A4 specification (210x297 mm) (Please read the precautions on the back before filling this page) --- ----- Order ------ II · Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economy 548955 A7 B7 878twf.doc / 009 V. Description of the invention) It is easy to understand. With the accompanying drawings, the detailed description is as follows: Brief description of the drawings = Figure 1 shows the system block diagram of the scanner of the staggered sensor; Figure 2 shows the actual image of the document; Figure 3 Figure 4 shows a pull image generated when a document is scanned by a scanner using an interlaced sensor; Figure 4A shows a calculation of K 値 using a reference leading edge according to a preferred embodiment of the present invention. Figure 4B shows a flowchart for calculating K 値 using a reference leading edge according to another preferred embodiment of the present invention; and Figure 5 shows a preferred implementation according to the present invention Example is a flowchart of compensating the zipper image using K 値.
重要元件標號 100 :掃描器 110 :交錯式感應器 120 ： ASIC 130 :影像補償緩衝區 140 :輸入/輸出介面 150 :電腦主機 s400-s410 :本發明之一較佳實施例之利用參考領先緣線計 算K値的施行步驟 s420-s430:本發明之另-較佳實施例之利用參考領先緣線 -----------裝--------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 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） 548955 五、發明說明) 計算K値的施行步驟 S500-S520 :本發明之一較佳實施例之利用K値補償拉鍊影 像的施行步驟 較佳實施例 因爲交錯式感應器之主線與副線的線距很短，因此主 線會受到副線之反射光影響，反之，主線之反射光也會影 響副線。所以在尋找參考領先緣線時，可同時計算主線與 副線互相影響的常數K。因主線與副線的架構一樣，所以 只需算出副線影響主線之K値即可。當補償時，只需判斷 是主線或副線即可。 第4A圖繪示的是根據本發明之一較佳實施例之利用 參考領先緣線計算K値的流程圖。而第4B圖繪示的是根據 本發明之另一較佳實施例之利用參考領先緣線計算K値的 流程圖。在第4A圖及第4B圖之中，假設主線與副線間的 線距是2條線，被決定的參考領先緣線稱爲第m(m爲正整 數)線，以及X=(n+l)/2，X爲>0的整數。 當使用具有交錯式感應器的掃描器掃描文件時，在尋 找參考領先緣線時，需有黑白交界的圖形在校正圖上，用 以決定參考領先緣線。請參照第4A圖，當參考領先緣線（第 m線）之第η個原始像素（Pn)m爲主線掃描所得時，將第m線 之第η個原始像素（Pn)m減去第m線之第n+1個原始像素 (Pr^U，除以第（m-2)線之第ii-l個原始像素及第（m-2) 線之第n+1個原始像素（P^)m_2之和，而得到第η個K値，也 就是 Kn=( Pn - Pn —】）m/( Pny P,1 + 1)m_2(如步驟 s400)。接下來會 7 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)Significant component numbers 100: scanner 110: interlace sensor 120: ASIC 130: image compensation buffer 140: input / output interface 150: computer host s400-s410: one of the preferred embodiments of the present invention using the reference leading edge Steps s420-s430 for calculating K 値: Another-preferred embodiment of the present invention uses a reference leading edge ----------- installation -------- order ---- ----- Line ^^ · (Please read the notes on the back before filling this page) Printed by the Intellectual Property Bureau of the Ministry of Economic Affairs, Consumer Cooperatives This paper is printed in accordance with China National Standard (CNS) A4 (210 X 297 mm) ) 548955 V. Description of the invention) Implementation steps S500-S520 for calculating K 値: One preferred embodiment of the present invention is the implementation step of using K 値 to compensate the zipper image. The line spacing is very short, so the main line will be affected by the reflected light from the auxiliary line. Conversely, the reflected light from the main line will also affect the auxiliary line. Therefore, when looking for the reference leading edge line, the constant K that the main line and the auxiliary line interact with each other can be calculated at the same time. Since the main line has the same structure as the auxiliary line, it is only necessary to calculate the K 算出 of the auxiliary line affecting the main line. When compensating, just judge whether it is the main line or the auxiliary line. FIG. 4A shows a flowchart for calculating K 値 using a reference leading edge according to a preferred embodiment of the present invention. FIG. 4B shows a flowchart for calculating K 値 using a reference leading edge according to another preferred embodiment of the present invention. In Figures 4A and 4B, it is assumed that the line spacing between the main line and the auxiliary line is 2 lines. The determined leading edge line is called the m-th (m is a positive integer) line, and X = (n + l) / 2, X is an integer of > 0. When using a scanner with an interlaced sensor to scan a document, when looking for a reference leading edge, a black-and-white border figure on the calibration chart is needed to determine the reference leading edge. Please refer to FIG. 4A. When the n-th original pixel (Pn) m of the leading edge (m-line) is referred to as the main line scan, the n-th original pixel (Pn) m of the m-th line is subtracted from the m-th The n + 1th original pixel of the line (Pr ^ U, divided by the (ii-2) th original pixel of the (m-2) th line and the n + 1th original pixel of the (m-2) th line (P ^ ) m_2 to get the nth K 値, which is Kn = (Pn-Pn —]) m / (Pny P, 1 + 1) m_2 (as in step s400). Next, the paper size will be applicable to China National Standard (CNS) A4 Specification (210 X 297 mm) (Please read the precautions on the back before filling this page)
裝--------訂-------I 經濟部智慧財產局員工消費合作社印製 548955 五、發明說明（b ) 重複上述步驟，直到文件掃描完成，然後將(第1個K値）， κ3(第2個K値），K5(第5個κ値），…，以及Kn的和除以X，而得 到Κ値（如步驟S410)，用以補償拉鍊影像。 接著請參照第4Β圖，當參考領先緣線（第m線）之第η 個原始像素（Pn)m爲副線掃描所得時，將第m線之第η個原始 像素（Pn)m減去第m線之第η+1個原始像素（Pn+1)m，除以第 (m+2)線之第η-1個原始像素（Ph)^及第（m+2)線之第n+1個 原始像素（Pn+1)m+2之和，而得到第η個K値，也就是1=(?11-)m/( Pw+ Pn+1)m+2(如步驟s420)。接下來會重複上述步 驟，直到文件掃描完成，然後將1(第1個K値），K3(第2個K 値），Κ5(第5個Κ値），…，以及Κη的和除以X，而得到Κ値（如 步驟s430)，用以補償拉鍊影像。 然後，利用上述所得到的Κ値，對拉錬影像進行補償。 第5圖繪示的是根據本發明之一較佳實施例之利用Κ値補償 拉鍊影像的流程圖。在第5圖中，假設主線與副線間的線距 是2條線。 在此實施例中，首先，判斷第m(m爲正整數）線之第η(η 爲正整數）個原始像素是否爲主線掃描所得（如步驟S500)。 接著，如果第m線之第η個原始像素爲主線掃描所得時，則 第m線之第η個原始像素，將補償爲第111線之第η個補償 像素（Pn’)m，其中第m線之第η個補償像素（。，、爲第⑺線之 第η個原始像素（Ρη)„^去第（m-2)線之第η-1個原始像素（Ρ„_ 山_2與第（m-2)線之第η+1個原始像素（Pn + i)m 2之和與κ値相乘 所得之積後所得的値，也就是（Pn’）m = ( Pn )m — K ( Pn_〗+ 8 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) ▼4^ · ! ί 丨——訂·----I I I 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 548955 五、發明說明（Λ )-------- Order ------- I Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 548955 V. Description of Invention (b) Repeat the above steps until the document scanning is completed, and then (the 1st K 値), κ3 (the second K 値), K5 (the fifth K 値), ..., and the sum of Kn divided by X to obtain K 値 (such as step S410), which is used to compensate the zipper image. Please refer to FIG. 4B. When the n-th original pixel (Pn) m of the leading edge (m-line) is referred to as the scan of the sub-line, the n-th original pixel (Pn) m of the m-th line is subtracted. The η + 1th original pixel (Pn + 1) m of the mth line divided by the η-1th original pixel (Ph) ^ of the (m + 2) th line and the nth of the (m + 2) th line +1 the sum of the original pixels (Pn + 1) m + 2 to obtain the nth K 値, that is, 1 = (? 11-) m / (Pw + Pn + 1) m + 2 (as in step s420). The above steps are repeated until the file scanning is completed, and then 1 (the first K 値), K3 (the second K 値), KK5 (the fifth K 値), ..., and the sum of κη divided by X , To obtain KK (step s430), which is used to compensate the zipper image. Then, using the obtained κ 値, the pull-up image is compensated. FIG. 5 is a flowchart of compensating a zipper image using KK using a preferred embodiment of the present invention. In Fig. 5, it is assumed that the line spacing between the main line and the sub-line is two lines. In this embodiment, first, it is determined whether the nth (n is a positive integer) original pixel of the mth (m is a positive integer) line is obtained by scanning the main line (step S500). Next, if the n-th original pixel of the m-th line is obtained by scanning the main line, the n-th original pixel of the m-th line will be compensated as the n-th compensated pixel (Pn ') m of the 111-th line, where the m-th The nth compensated pixel of the line (,, is the nth original pixel (Pη) of the second line, and goes to the (n-2) th line of the (n-2) th original pixel (P „_ 山 _2 and The -2 obtained by multiplying the sum of the η + 1th original pixel (Pn + i) m 2 of the (m-2) line by κ 値, which is (Pn ') m = (Pn) m — K (Pn_〗 + 8 This paper size applies to China National Standard (CNS) A4 size (210 x 297 mm) (Please read the precautions on the back before filling out this page) ▼ 4 ^ ·! Ί 丨 ——Order ·- --- IIII Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs 548955 V. Invention Description (Λ)
Pn+!)m_2(如步驟s5 1 0)。而如果第m線之第n個原始像素爲副線 掃描所得時’則第m線之第η個原始像素（Pn)m，將補償爲第 m線之第η個補償像素（Pn’)m，其中第!^線之第n個補償像素 (Ρη’ )111爲弟m線之弟η個原始像素（Pn)m減去第（m + 2)線之第η_ 1個原始像素（Pn〃)rn+2與第（m+2)線之第η+1個原始像素 (Pn+1)m+2之和與Κ値相乘所得之積後所得的値，也就是 (Pn )m = ( Pn )m - K ( Pw + Pn+i)m + 2(如步驟 s520)。之後，會 重複上述步驟，直到文件掃描完成，而使所產生的拉鍊影 像都得到恰當地補償。 綜上所述，本發明具有如下的優點： 1 ·藉由參考領先緣線所計算得到的K値，使得以交錯 式感應器的掃描器對文件進行掃描時，所產生的拉鍊影像 能夠得到恰當的補償。 2·使掃描文件後，所得到的影像，能與真實影像幾乎 完全相同。 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 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。 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)Pn +!) M_2 (as in step s5 1 0). And if the n-th original pixel of the m-th line is obtained from the sub-line scan, then the n-th original pixel (Pn) m of the m-th line will be compensated as the n-th compensated pixel (Pn ') m of the m-th line , Where the nth compensated pixel (Pη ′) of the! ^ Line is the nth original pixel (Pn) m of the mth line minus the η_ 1th original pixel (Pn〃) of the (m + 2) th line ) rn + 2 and the (m + 2) -th line of the η + 1th original pixel (Pn + 1) m + 2 and the product of the product obtained by multiplying κ 値, which is (Pn) m = (Pn) m-K (Pw + Pn + i) m + 2 (as in step s520). After that, the above steps are repeated until the document scanning is completed, so that the generated zipper images are properly compensated. To sum up, the present invention has the following advantages: 1 · The K 値 calculated by referring to the leading edge makes it possible to obtain a proper zipper image when scanning a document with a staggered sensor scanner. Compensation. 2. Make the image obtained after scanning the file almost the same as the real image. Although the present invention has been disclosed as above with a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can make various modifications and retouches without departing from the spirit and scope of the present invention. Therefore, the present invention The scope of protection shall be determined by the scope of the attached patent application. This paper size applies to China National Standard (CNS) A4 (210 X 297 mm) (Please read the precautions on the back before filling this page)