201137675 六、發明說明： 【發明所屬之技術領域】 且特別是有關=於·觸控點之追蹤方法及追蹤系統’ 、種多點觸控·點之追蹤方法及追蹤系統。 【先前技術】 的進步：以平:f術的發展，顯示器的顯示效果已有長足 優點，可以有j示器為例，其係具有重量輕、體積小等 其逐漸成為市在電子I置中所佔用的空間，使 各樣桌上型I车u机的平面顯示器，並且廣泛地應用在 生/、手持式電子裝置中。 近年來，為γ # 的便利性，業^ ^ 、更直覺的操作方式，以提升使用上 面板以及顯；面合觸控功能的顯示器，將觸控 接點選晝面來進行各：：一模組中，讓使用者可藉由直 觸控、電容式觸:各常見的觸控方式包含電阻式 A,- 電磁式觸控、紅外光觸控等方式，而 用^可以早點式操作逐漸邁向多點式觸控操作，讓使 用者：:在觸控面板上進行多樣化的手勢操作。 t而。觸控面板是沿著—掃描方向依序感測面板 或多個觸控點。然而此種感測方式容易導致使用者 t面板上多點晝線時，發生晝線錯誤的問題。當使用 在觸控面板上以多個觸控點，同時沿掃瞒方向的正向及 反向晝線時，因為觸控點在掃猫方向上的先後次序發生改 變’會導致線條連接錯誤的問題。如此便無法在觸控面板 上正確晝出多條平行於掃瞄方向的直線。 201137675 【發明内容】 因此，本發明之目的是在提供一種觸控點之追蹤方法 及追蹤系統，用以解決多點式觸控交錯晝線時，發生畫線 錯誤的問題。 本發明之一方面係提出一種觸控點的追蹤方法，包含201137675 VI. Description of the Invention: [Technical Fields of the Invention] In particular, it relates to a tracking method and tracking system for a touch point, a multi-touch, point tracking method, and a tracking system. [Prior Art] Progress: With the development of Ping: f technology, the display effect of the display has a long-term advantage, and there can be a display device, which has a light weight, a small volume, etc., which gradually becomes a city in the electronic I. The space occupied makes a flat panel display of various desktop type I vehicles, and is widely used in raw/handheld electronic devices. In recent years, for the convenience of γ#, the industry's ^ ^, more intuitive operation mode, to enhance the use of the upper panel and display; surface touch function display, touch the touch point to select each side: In the module, users can use direct touch and capacitive touch: common touch methods include resistive A, electromagnetic touch, infrared touch, etc., and can be operated early. Towards a multi-touch operation, the user:: performs a variety of gesture operations on the touch panel. t and. The touch panel sequentially senses the panel or multiple touch points along the scan direction. However, such a sensing method is likely to cause a problem of a twisting line when a user clicks on a multi-point line on the panel. When using multiple touch points on the touch panel and simultaneously tweeting in the forward and reverse directions along the broom direction, the order of the touch points in the direction of sweeping the cat changes, which may result in incorrect line connection. problem. In this way, it is impossible to correctly draw a plurality of straight lines parallel to the scanning direction on the touch panel. SUMMARY OF THE INVENTION Therefore, the object of the present invention is to provide a tracking method and a tracking system for a touch point, which are used to solve the problem of line drawing errors when multi-point touch interleaving is performed. One aspect of the present invention provides a method for tracking a touch point, including
• 下述步驟：於一第一掃瞄時間中取得N個基準觸控點，N . 為大於或等於2之整數；於一第二掃瞄時間中取得Μ個參 • 考觸控點，Μ為大於或等於2之整數；計算Μ個參考觸控 點各自與第η個基準觸控點的距離，η為1〜Ν之整數；輸 出Μ個參考觸控點中與第η個基準觸控點距離最短者；以 及，根據輸出之參考觸控點及對應之第η個基準觸控點形 成一第一線條。 依據本發明一實施例，追蹤方法更包含判斷Μ是否大 於或等於Ν之步驟。當判斷出Μ大於或等於Ν時，執行 計算步驟。 • 依據本發明一實施例，計算Μ個參考觸控點各自與第 η個基準觸控點距離之步驟、輸出Μ個參考觸控點中與第 η個基準觸控點距離最短者之步驟及形成第一線條之步驟 係重複執行Ν次，以形成Ν條第一線條。 .依據本發明一實施例，追蹤方法更包含判斷Μ是否大 於或等於Ν之步驟。當判斷出Μ小於Ν時，計算Ν個基 準觸控點各自與第m個參考觸控點的距離，m為1〜Μ之整 數。追蹤方法接著更包含以下步驟：輸出Ν個基準觸控點 中與第m個參考觸控點距離最短者；以及，根據輸出之基 201137675 準觸控點及對應之第m個參考觸控點形成一第二線條。 依據本發明一實施例，計算N個基準觸控點各自與第 m個參考觸控點距離之步驟、輸出N個基準觸控點中與第 m個參考觸控點距離最短者之步驟及形成第二線條之步驟 係重複執行Μ次，以形成Μ條第二線條。 本發明之另一方面係提出一種觸控點的追蹤系統，包 - 含一擷取單元、一運算單元、一輸出單元以及一繪製單元。 擷取單元用以於不同之掃瞄時間中分別取得Ν個基準觸控 φ 點及Μ個參考觸控點，Ν及Μ分別為大於或等於2之整 數。運算單元用以計算Μ個參考觸控點各自與第η個基準 觸控點的距離，η為1〜Ν之整數。輸出單元用以由Μ個參 考觸控點中輸出與第η個基準觸控點距離最短者。繪製單 元用以根據輸出之參考觸控點及對應之第η個基準觸控點 形成一第一線條。 依據本發明一實施例，追蹤系統更包含一判斷單元， 用以判斷Μ是否大於或等於Ν。運算單元用以於判斷單元 _ 判斷出Μ大於或等於Ν時計算Μ個參考觸控點各自與第η 個基準觸控點的距離。 依據本發明一實施例，運算單元更用以於判斷單元判 斷出Μ小於Ν時計算Ν個基準觸控點各自與第m個參考 觸控點的距離，m為1〜Μ之整數。 依據本發明一實施例，輸出單元更用以由Ν個基準觸 控點中輸出與第m個參考觸控點距離最短者。繪製單元更 用以根據輸出之基準觸控點及對應之第m個參考觸控點形 成一第二線條。 201137675 上述本發明實施例之觸控點之追蹤方法及追蹤系統， 利用求出最短距離之觸控點來畫線，可以提升多指交錯晝 線時的準確性，提升觸控的品質。 【實施方式】 請參照第1圖，其繪示依照本發明一實施例之一種觸 ‘ 控點之追蹤方法的流程圖。本實施例之追蹤方法首先執行 : 步驟S1，於一第一掃瞄時間中取得N個基準觸控點。 • 實際應用上，本實施例之觸控點的追蹤方法係應用於 追蹤多點式之觸控點，因此N為大於或等於2之整數，表 示在第一掃瞄時間中係取得兩個以上的基準觸控點。進一 步來說，取得N個基準觸控點之步驟至少包含下述子步 驟··感測一觸控位置；根據一感測訊號值計算取得所述觸 控位置之一座標值，以取得一個基準觸控點；以及，在第 一掃瞄時間中重複執行感測步驟及計算步驟，以取得N個 基準觸控點。 • 為了簡化說明，並且凸顯出本發明之特徵，首先係以 取得兩個基準觸控點為例進行說明，亦即N為2。請同時 參照第2圖，其繪示在第一掃瞄時間中取得兩個基準觸控 點的示意圖。追蹤方法係於觸控面板之一掃瞄畫面200中 . 取得第一基準觸控點211及第二基準觸控點212。此掃瞄 晝面200係對應於第一掃瞄時間。首先於掃瞄晝面200中， 沿一觸控掃瞄方向D感測觸控位置。例如由掃瞄畫面200 之左側沿觸控掃瞄方向D朝向掃瞄晝面200之右侧感測觸 控位置，藉以感測到第一個觸控位置（對應於第一基準觸 201137675 控=11的觸控位置）。接著，根據觸控面板的觸控感測器 所產生之對應於帛-侧魏置的❹彳 所述第-侧控位置在掃”面上的絲值2以取 得第-基準觸控點21卜在計算過程中更可進—步利用補 插值法提高取得座標值的精確度β第—_時間中係重 複執行感測、計算之步驟，以感測到第二個觸控位置（對 應於第二基準觸控點212的觸控位置）並計真=值， 進而取得第二基準觸控點212。 、 $ 如步驟S2所述’本實施例之追蹤方法接著於一第二掃 晦時間中取得Μ個參考觸控點。同樣地，由於本實施例之 觸控點的追蹤方法係應用於追縱多點式之觸控點，因此Μ 為大於或等於2之整數’表示在第二掃瞄時間中係取得兩 個以上的參考觸控點。進一步來說，取得Μ個參考觸控點 之步驟至少包含下述子步驟：感測觸控位置；根據感測訊 號值計算取得所述觸控位置之座標值，以取得一個參考觸 控點；以及，在第二掃瞄時間中重複執行感測步驟及計算 步驟，以取得]V[個參考觸控點。 此處係以取得兩個參考觸控點為例進行說明’亦即Μ 為2。請同時參照第3圖’其、繪示在第二掃猫時間中取得 兩個參考觸控點的示意圖。追蹤方法係於對應第二掃瞄時 間的掃瞄畫面2〇〇,中取得第一參考觸控點221及第二參考 觸控點222。首先於掃瞄晝面2〇〇’中’沿一觸控掃猫方向D 感測觸控位置。例如由掃瞄畫面200’之左側沿觸控掃瞄方 向D朝向掃瞄畫面200’之右侧感測觸控位置，藉以感蜊到 第一個觸控位置（對應於第二參考觸控點222的觸控仇 201137675 置）。接著，根據觸控面板的觸控感測器所產生之對應於第 一個觸控位置的感測訊號值，計算取得所述第一個觸控位 置在掃瞄畫面200’上的座標值，藉以取得第二參考觸控點 222。在第二掃瞄時間中係重複執行感測、計算之步驟，以 感測到第二個觸控位置（對應於第一參考觸控點221的觸 控位置）並計算其座標值，進而取得第一參考觸控點221。 如步驟S3所示，本實施例之追蹤方法接著進行判斷Μ 是否大於或等於Ν的步驟。在取得第一基準觸控點211與 第二基準觸控點212，以及取得第一參考觸控點221與第 二參考觸控點222的條件下，Ν及Μ均為2。也就是由第 一掃瞄時間至第二掃瞄時間時，觸控點的數量並沒有發生 變化。當判斷出Μ大於或等於Ν時，追蹤方法接著執行步 驟S4。 如步驟S4所示，計算Μ個參考觸控點各自與第η個 基準觸控點的距離，其中η為1~Ν之整數。當η為1時， 計算第一參考觸控點221與第一基準觸控點211的距離 W1，以及計算第二參考觸控點222與第一基準觸控點211 的距離W2。 如步驟S5所示，輸出Μ個參考觸控點中與第η個基 準觸控點距離最短者。由前述計算取得之距離W1及W2 可以得知第一參考觸控點221及第二參考觸控點222何者 與第一基準觸控點211距離最短。舉例來說，距離W1小 於距離W2，亦即第一參考觸控點221與第一基準觸控點 211距離最短。因此輸出第一參考觸控點221，將其作為與 第一基準觸控點211關聯之觸控點。 m 9 201137675 如步驟S6所示，根據輸出之參考觸控點及對應之第η 個基準觸控點形成一第一線條。請同時參照第4圖，其繪 示在第3圖之掃瞄畫面中形成第一線條的示意圖。在步驟 S6中係根據前述輸出之第一參考觸控點221及對應之第一 基準觸控點211，形成一條第一線條410。 接下來，本實施例之追蹤方法係重複執行步驟S4至步 驟S6數次，並改變η的值。當η為2時，計算第一參考觸 控點221與第二基準觸控點212的距離W3,以及計算第二 參考觸控點222與第二基準觸控點212的距離W4，如第3 圖所示。舉例來說，距離W4小於距離W3，亦即第二參考 觸控點222與第二基準觸控點212距離最短。因此輸出第 二參考觸控點222，將其作為與第二基準觸控點212關聯 之觸控點。接著根據前述輸出之第二參考觸控點222及對 應之第二基準觸控點212，形成另一條第一線條410，如第 4圖所示。 實際應用上，步驟S4、步驟S5及步驟S6係重複執行 Ν次，直到計算取得所有參考觸控點與所有基準觸控點各 自之距離，並進一步對應形成Ν條第一線條410。 前述第二掃瞄時間之掃瞄晝面200’中，係以取得第一 參考觸控點221及第二參考觸控點222為例，然而本發明 之技術並不限制於第一、第二掃瞄時間中具有相同數量的 觸控點。請參照第5圖，其繪示在第二掃瞄時間中取得三 個參考觸控點的示意圖。在第二掃瞄時間的掃瞄晝面500’ 中，係以取得第一參考觸控點221、第二參考觸控點222 及第三參考觸控點223為例，也就是說Ν為2，Μ為3。 201137675 當在步驟S3中判斷出Μ大於或等於N時，追蹤方法接著 執行步驟S4。 在步驟S4中，計算三個參考觸控點（第一參考觸控點 22卜第二參考觸控點222及第三參考觸控點223)各自與 第η個基準觸控點的距離。當η為1時，計算第一參考觸 控點221與第一基準觸控點211的距離計算第二參考 觸控點222與第一基準觸控點211的距離W2,並且計算第 三參考觸控點223與第一基準觸控點211的距離W5。 如步驟S5所示，輸出三個參考觸控點中與第一基準 211觸控點距離最短者。舉例來說，距離W1為三個距離 Wl、W2及W5中最小者，亦即第一參考觸控點221與第 一基準觸控點211距離最短。因此輸出第一參考觸控點 221，將其作為與第一基準觸控點211關聯之觸控點。 如步驟S6所示，根據輸出之第一參考觸控點221及對 應之第一基準觸控點211，形成一條第一線條410，如第6 圖所示。第6圖繪示在第5圖之掃瞄畫面中形成第一線條 的示意圖。 另外在步驟S4中，當η為2時，計算第一參考觸控點 221與第二基準觸控點212的距離W3，計算第二參考觸控 點222與第二基準觸控點212的距離W4,並且計算第三參 考觸控點223與第二基準觸控點212的距離W6，如第5 圖所示。舉例來說，距離W4為三個距離W3、W4及W6 中最小者，亦即第二參考觸控點222與第二基準觸控點212 距離最短。因此輸出第二參考觸控點222，將其作為與第 二基準觸控點212關聯之觸控點。接著根據輸出之第二參 IS] 11 201137675 考觸控點222及對應之第二基準觸控點212，形成另一條 第一線條410，如第6圖所示。 前述步驟S3中，係以取得之參考觸控點數大於或等於 基準觸控點數的條件下進行說明（如第3圖及第4圖所 示）。然而當參考觸控點數小於基準觸控點數時，在步驟 S3中係判斷出Μ小於N，追蹤方法接著執行步驟S7。 請參照第7圖及第8圖，第7圖繪示在第一掃瞄時間 中取得三個基準觸控點的示意圖，第8圖繪示在第二掃瞄 時間中取得兩個參考觸控點的示意圖。當在第一掃瞄時間 之掃瞄晝面700中取得第一基準觸控點211、第二基準觸 控點212及第三基準觸控點213 (亦即Ν為3)，以及在第 二掃瞄時間之掃瞄晝面700’中取得第一參考觸控點221及 第二參考觸控點222 (亦即Μ為2)時，追蹤方法係執行 步驟S7。 如步驟S7所示，計算Ν個參考觸控點各自與第m個 基準觸控點的距離，其中m為1〜Μ之整數。當m為1時， 計算第一基準觸控點211與第一參考觸控點221的距離 W1，計算第二基準觸控點212與第一參考觸控點221的距 離W2，並且計算第三基準觸控點213與第一參考觸控點 221的距離W3。 如步驟S8所示，輸出N個基準觸控點中與第m個參 考觸控點距離最短者。舉例來說，距離W2為三個距離W卜 W2及W3中最小者，亦即第二基準觸控點212與第一參考 觸控點221距離最短。因此輸出第二基準觸控點212，將 其作為與第一參考觸控點221關聯之觸控點。 I S] 12 201137675 如步驟S9所示，根據輸出之基準觸控點及對應之第m 個參考觸控點形成一第二線條。請同時參照第9圖，其繪 示在第8圖之掃瞄畫面中形成第二線條的示意圖。在步驟 S9中係根據前述輸出之第二基準觸控點212及對應之第一 參考觸控點221，形成一條第二線條420。 接下來，本實施例之追蹤方法係重複執行步驟S7至步 驟S9數次，並改變m的值。當m為2時，計算第一基準 觸控點211與第二參考觸控點222的距離W4,以及計算第 二基準觸控點212與第二參考觸控點222的距離W5,並且 計算第三基準觸控點213與第二參考觸控點222的距離W6 如第3圖所示。舉例來說，距離W6為三個距離W4、W5 及W6中最小者，亦即第三基準觸控點213與第二參考觸 控點222距離最短。因此輸出第三基準觸控點213，將其 作為與第二參考觸控點222關聯之觸控點。接著根據前述 輸出之第三基準觸控點213及對應之第二參考觸控點 222，形成另一條第二線條420，如第9圖所示。 實際應用上，步驟S7、步驟S8及步驟S9係重複執行 Μ次，直到計算取得所有基準觸控點與所有參考觸控點各 自之距離，並進一步對應形成Μ條第二線條420。 另外一方面，本發明實施例之觸控點的追蹤方法係以 應用於一追蹤系統為例，請參照第10圖。第10圖繪示依 照本發明一實施例之一種觸控點之追蹤系統的功能方塊 圖。追蹤系統100至少包含一擷取單元110、一運算單元 120、一輸出單元130以及一繪製單元140。擷取單元110 用以於不同的掃瞄時間中分別取得Ν個基準觸控點及Μ個 I S1 13 201137675 參考觸控點，N及Μ分別為大於或等於2之整數。運算單 元120用以計算Μ個參考觸控點各自與第η個基準觸控點 的距離，η為1〜Ν之整數。輸出單元130用以由Μ個參考 觸控點中輸出與第η個基準觸控點距離最短者。繪製單元 140用以根據輸出之參考觸控點及對應之第η個基準觸控 點形成第一線條。 更進一步來說，追蹤系統100更包含一判斷單元150， 用以判斷Μ是否大於或等於Ν。運算單元120係於判斷單 元150判斷出Μ大於或等於Ν時，計算Μ個參考觸控點 各自與第η個基準觸控點的距離，以取得Μ個參考觸控點 中與第η個基準觸控點距離最短者。另外，運算單元120 更用以於判斷單元150判斷出Μ小於Ν時，計算Ν個基 準觸控點各自與第m個參考觸控點的距離，m為1〜Μ之整 數。經由運算單元120之計算，追蹤系統100可以取得Ν 個基準觸控點中與第m個參考觸控點距離最短者。 另外，輸出單元130更用以由N個基準觸控點中，輸 出與第m個參考觸控點距離最短者。繪製單元140更用以 根據輸出之基準觸控點及對應之第m個參考觸控點形成第 二線條。 上述依照本發明實施例之觸控點之追蹤方法及追蹤系 統，當參考觸控點之數目等於或大於基準觸控點之數目 時，係由多個參考觸控點中輸出與第η個基準觸控點距離 最短者，並根據輸出之參考觸控點及對應之第η個基準觸 控點形成線條。當參考觸控點之數目小於基準觸控點之數 目時，係由多個基準觸控點中輸出與第m個參考觸控點距 201137675 離最短者，並根據輸出之基準觸控點及對應之第m個參考 觸控點形成線條。以此方式利用最短距離之觸控點作為晝 線時的下一點，可以避免多觸控點交錯晝線時發生線條連 接錯誤的問題，提升觸控操作的正確性。 雖然本發明已以實施方式揭露如上，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 範圍内，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為準。 【圖式簡單說明】 為讓本發明之上述和其他目的、特徵、優點與實施例 能更明顯易懂，所附圖式之說明如下： 第1圖繪示依照本發明一實施例之一種觸控點之追蹤 方法的流程圖。 第2圖繪示在第一掃瞄時間中取得兩個基準觸控點的 示意圖。 I 第3圖繪示在第二掃瞄時間中取得兩個參考觸控點的 示意圖。 第4圖繪示在第3圖之掃瞄晝面中形成第一線條的示 意圖。 第5圖繪示在第二掃瞄時間中取得三個參考觸控點的 示意圖。 第6圖繪示在第5圖之掃瞄晝面中形成第一線條的示 意圖。 第7圖繪示在第一掃瞄時間中取得三個基準觸控點的 I S1 15 201137675 示意圖。 第8圖繪示在第二掃瞄時間中取得兩個參考觸控點的 示意圖。 第9圖繪示在第8圖之掃瞄畫面中形成第二線條的示 意圖。 第10圖繪示依照本發明一實施例之一種觸控點之追 蹤系統的功能方塊圖。 【主要元件符號說明】 100 :追蹤系統 700’ ：掃瞄晝面 110 :擷取單元 D :方向 120 :運算單元 S1 :步驟 130 :輸出單元 S2 :步驟 140 :繪製單元 S3 :步驟 150 :判斷單元 S4 :步驟 200 :掃瞄晝面 S5 :步驟 200’ ：掃瞄晝面 S6 :步驟 211 :第一基準觸控點 S7 :步驟 212 :第二基準觸控點 S8 :步驟 213 :第三基準觸控點 S9 :步驟 221 :第一參考觸控點 W1 :距離 222 :第二參考觸控點 W2 :距離 223 :第三參考觸控點 W3 :距離 410 :第一線條 W4 :距離 420 :第二線條 W5 :距離 201137675 500’ ：掃瞄晝面 700 :掃瞄晝面• The following steps: obtain N reference touch points in a first scan time, N. is an integer greater than or equal to 2; obtain a touch point in a second scan time, Μ An integer greater than or equal to 2; calculating the distance between each of the reference touch points and the nth reference touch point, η is an integer from 1 to ;; outputting the reference touch points and the nth reference touch The point distance is the shortest; and, according to the output reference touch point and the corresponding nth reference touch point, a first line is formed. According to an embodiment of the invention, the tracking method further comprises the step of determining whether Μ is greater than or equal to Ν. When it is judged that Μ is greater than or equal to Ν, the calculation step is performed. According to an embodiment of the invention, the steps of calculating the distance between each of the reference touch points and the nth reference touch point, and outputting the shortest distance between the reference touch points and the nth reference touch point are The step of forming the first line is repeated one time to form the first line of the stringer. According to an embodiment of the invention, the tracking method further comprises the step of determining whether the defect is greater than or equal to Ν. When it is judged that Μ is smaller than Ν, the distance between each of the reference touch points and the mth reference touch point is calculated, and m is an integer of 1 to Μ. The tracking method further includes the following steps: outputting the shortest distance between the reference touch points and the mth reference touch point; and forming the quasi-touch point and the corresponding mth reference touch point according to the output base 201137675 A second line. According to an embodiment of the invention, the steps of calculating the distance between each of the N reference touch points and the mth reference touch point, and the step of outputting the shortest distance between the N reference touch points and the mth reference touch point are formed. The step of the second line is repeated one time to form a second line of the purlin. Another aspect of the present invention provides a tracking system for a touch point, comprising: a capture unit, an arithmetic unit, an output unit, and a drawing unit. The capture unit is configured to obtain one reference touch φ point and one reference touch point respectively in different scan times, and Ν and Μ are respectively integers greater than or equal to 2. The operation unit is configured to calculate a distance between each of the reference touch points and the nth reference touch point, and η is an integer of 1 to 。. The output unit is used to minimize the distance between the output of the reference touch point and the nth reference touch point. The drawing unit is configured to form a first line according to the output reference touch point and the corresponding nth reference touch point. According to an embodiment of the invention, the tracking system further includes a determining unit for determining whether the defect is greater than or equal to Ν. The operation unit is configured to calculate a distance between each of the reference touch points and the nth reference touch point when the determining unit _ determines that Μ is greater than or equal to Ν. According to an embodiment of the invention, the computing unit is further configured to calculate a distance between each of the reference touch points and the mth reference touch point when the determining unit determines that Μ is smaller than Ν, where m is an integer from 1 to 。. According to an embodiment of the invention, the output unit is further configured to: the output of the reference touch points is the shortest distance from the mth reference touch point. The drawing unit is further configured to form a second line according to the output reference touch point and the corresponding mth reference touch point. 201137675 The tracking method and tracking system of the touch point according to the embodiment of the present invention, by using the touch point of the shortest distance to draw a line, can improve the accuracy of the multi-finger interlaced line and improve the quality of the touch. [Embodiment] Please refer to FIG. 1 , which is a flow chart of a method for tracking a touch point according to an embodiment of the invention. The tracking method of this embodiment is first executed: Step S1, N reference touch points are obtained in a first scan time. In actual application, the tracking method of the touch point in this embodiment is applied to track the multi-point touch point, so N is an integer greater than or equal to 2, indicating that more than two are obtained in the first scan time. The base touch point. Further, the step of obtaining the N reference touch points includes at least the following substeps: sensing a touch position; calculating a coordinate value of the touch position according to a sensed signal value to obtain a reference a touch point; and repeating the sensing step and the calculating step in the first scan time to obtain N reference touch points. • In order to simplify the description and highlight the features of the present invention, first, two reference touch points are taken as an example, that is, N is 2. Please also refer to FIG. 2, which shows a schematic diagram of obtaining two reference touch points in the first scan time. The tracking method is performed on one of the touch screens 200 of the touch panel. The first reference touch point 211 and the second reference touch point 212 are obtained. This scan face 200 corresponds to the first scan time. First, in the scanning head 200, the touch position is sensed along a touch scanning direction D. For example, the touch position is sensed from the left side of the scan screen 200 along the touch scan direction D toward the right side of the scan head 200, thereby sensing the first touch position (corresponding to the first reference touch 201137675 control = 11 touch position). Then, according to the touch sensor of the touch panel, the silk value 2 corresponding to the side-side control position of the first side control position is obtained to obtain the first reference touch point 21 In the calculation process, the interpolation method can be used to improve the accuracy of obtaining the coordinate value. The first step is to perform the sensing and calculation steps to sense the second touch position (corresponding to The touch position of the second reference touch point 212 is calculated as a true value, and the second reference touch point 212 is obtained. The transaction method of the embodiment is followed by a second broom time as described in step S2. In the same manner, since the tracking method of the touch point in this embodiment is applied to track the multi-point touch point, Μ is an integer greater than or equal to 2, which is indicated in the second In the scanning time, more than two reference touch points are obtained. Further, the step of obtaining the reference touch points includes at least the following substeps: sensing the touch position; and obtaining the according to the sensing signal value calculation The coordinate value of the touch position to obtain a reference touch point; And repeating the sensing step and the calculating step in the second scanning time to obtain]V[a reference touch point. Here, taking two reference touch points as an example for description, that is, Μ is 2 Please also refer to Figure 3, which shows a schematic diagram of obtaining two reference touch points in the second scan time. The tracking method is based on the scan screen corresponding to the second scan time. a reference touch point 221 and a second reference touch point 222. First, the touch position is sensed along a touch sweeping direction D in the scanning plane 2〇〇'. For example, by the left side of the scan screen 200' The touch position is sensed along the right side of the scan screen 200' along the touch scan direction D, so that the first touch position is sensed (corresponding to the second reference touch point 222 of the touch control 201137675). And calculating a coordinate value of the first touch position on the scan screen 200 ′ according to the sensing signal value corresponding to the first touch position generated by the touch sensor of the touch panel. The second reference touch point 222 is obtained. In the second scan time, the sensing and counting are repeated. The step of sensing the second touch position (corresponding to the touch position of the first reference touch point 221) and calculating the coordinate value thereof to obtain the first reference touch point 221. As shown in step S3, The tracking method of this embodiment then performs the step of determining whether Μ is greater than or equal to Ν. The first reference touch point 211 and the second reference touch point 212 are obtained, and the first reference touch point 221 and the second reference touch are obtained. Under the condition of the control point 222, both Ν and Μ are 2. That is, the number of touch points does not change from the first scanning time to the second scanning time. When it is judged that Μ is greater than or equal to Ν, The tracking method then performs step S4. As shown in step S4, the distance between each of the reference touch points and the nth reference touch point is calculated, where η is an integer from 1 to 。. When η is 1, the first is calculated. The distance W1 between the touch point 221 and the first reference touch point 211 is referenced, and the distance W2 between the second reference touch point 222 and the first reference touch point 211 is calculated. As shown in step S5, the shortest distance from the nth reference touch point among the reference touch points is output. The distances W1 and W2 obtained by the foregoing calculations can be used to determine which of the first reference touch point 221 and the second reference touch point 222 is the shortest distance from the first reference touch point 211. For example, the distance W1 is less than the distance W2, that is, the distance between the first reference touch point 221 and the first reference touch point 211 is the shortest. Therefore, the first reference touch point 221 is outputted as a touch point associated with the first reference touch point 211. m 9 201137675 As shown in step S6, a first line is formed according to the output reference touch point and the corresponding nth reference touch point. Please also refer to Fig. 4, which shows a schematic diagram of forming a first line in the scan screen of Fig. 3. In step S6, a first line 410 is formed according to the first reference touch point 221 and the corresponding first reference touch point 211. Next, the tracking method of the present embodiment repeats steps S4 to S6 several times and changes the value of η. When η is 2, the distance W3 between the first reference touch point 221 and the second reference touch point 212 is calculated, and the distance W4 between the second reference touch point 222 and the second reference touch point 212 is calculated, as in the third The figure shows. For example, the distance W4 is smaller than the distance W3, that is, the distance between the second reference touch point 222 and the second reference touch point 212 is the shortest. Therefore, the second reference touch point 222 is outputted as a touch point associated with the second reference touch point 212. Then, according to the output second reference touch point 222 and the corresponding second reference touch point 212, another first line 410 is formed, as shown in FIG. In practical applications, step S4, step S5, and step S6 are repeatedly executed until the distances of all the reference touch points and all the reference touch points are calculated, and the first line 410 is further formed correspondingly. In the scan surface 200' of the second scan time, the first reference touch point 221 and the second reference touch point 222 are taken as an example, but the technology of the present invention is not limited to the first and second There are the same number of touch points in the scan time. Please refer to FIG. 5, which illustrates a schematic diagram of obtaining three reference touch points in the second scan time. In the scan face 500' of the second scan time, the first reference touch point 221, the second reference touch point 222, and the third reference touch point 223 are taken as an example, that is, the value is 2 , Μ is 3. 201137675 When it is judged in step S3 that Μ is greater than or equal to N, the tracking method then proceeds to step S4. In step S4, the distance between each of the three reference touch points (the first reference touch point 22, the second reference touch point 222 and the third reference touch point 223) and the nth reference touch point is calculated. When η is 1, calculating a distance between the first reference touch point 221 and the first reference touch point 211, calculating a distance W2 between the second reference touch point 222 and the first reference touch point 211, and calculating a third reference touch The distance W5 between the handle 223 and the first reference touch point 211. As shown in step S5, the shortest distance from the first reference 211 touch point among the three reference touch points is output. For example, the distance W1 is the smallest of the three distances W1, W2, and W5, that is, the distance between the first reference touch point 221 and the first reference touch point 211 is the shortest. Therefore, the first reference touch point 221 is output as a touch point associated with the first reference touch point 211. As shown in step S6, a first line 410 is formed according to the output first reference touch point 221 and the corresponding first reference touch point 211, as shown in FIG. Fig. 6 is a view showing the formation of the first line in the scan screen of Fig. 5. In addition, in step S4, when n is 2, the distance W3 between the first reference touch point 221 and the second reference touch point 212 is calculated, and the distance between the second reference touch point 222 and the second reference touch point 212 is calculated. W4, and calculating the distance W6 between the third reference touch point 223 and the second reference touch point 212, as shown in FIG. For example, the distance W4 is the smallest of the three distances W3, W4, and W6, that is, the distance between the second reference touch point 222 and the second reference touch point 212 is the shortest. Therefore, the second reference touch point 222 is output as the touch point associated with the second reference touch point 212. Then, according to the output second reference IS] 11 201137675 test touch point 222 and the corresponding second reference touch point 212, another first line 410 is formed, as shown in FIG. In the foregoing step S3, the description is made under the condition that the number of reference touch points obtained is greater than or equal to the number of reference touch points (as shown in FIGS. 3 and 4). However, when the number of reference touch points is less than the number of reference touch points, it is determined in step S3 that Μ is smaller than N, and the tracking method then performs step S7. Please refer to FIG. 7 and FIG. 8 . FIG. 7 is a schematic diagram of obtaining three reference touch points in the first scan time, and FIG. 8 is a view showing two reference touches in the second scan time. A schematic diagram of the point. The first reference touch point 211, the second reference touch point 212, and the third reference touch point 213 (that is, 3) are obtained in the scan surface 700 of the first scan time, and in the second When the first reference touch point 221 and the second reference touch point 222 are obtained in the scan time 700' of the scan time (that is, Μ is 2), the tracking method performs step S7. As shown in step S7, the distance between each of the reference touch points and the mth reference touch point is calculated, where m is an integer from 1 to 。. When m is 1, the distance W1 between the first reference touch point 211 and the first reference touch point 221 is calculated, the distance W2 between the second reference touch point 212 and the first reference touch point 221 is calculated, and the third is calculated. The distance W3 between the reference touch point 213 and the first reference touch point 221 . As shown in step S8, the shortest distance from the mth reference touch point among the N reference touch points is output. For example, the distance W2 is the smallest of the three distances Wb and W3, that is, the distance between the second reference touch point 212 and the first reference touch point 221 is the shortest. Therefore, the second reference touch point 212 is output as the touch point associated with the first reference touch point 221. I S] 12 201137675 As shown in step S9, a second line is formed according to the output reference touch point and the corresponding mth reference touch point. Please also refer to Fig. 9, which shows a schematic diagram of forming a second line in the scan screen of Fig. 8. In step S9, a second line 420 is formed according to the output second reference touch point 212 and the corresponding first reference touch point 221. Next, the tracking method of this embodiment repeats steps S7 to S9 several times and changes the value of m. When m is 2, the distance W4 between the first reference touch point 211 and the second reference touch point 222 is calculated, and the distance W5 between the second reference touch point 212 and the second reference touch point 222 is calculated, and the calculation is performed. The distance W6 between the three reference touch points 213 and the second reference touch point 222 is as shown in FIG. For example, the distance W6 is the smallest of the three distances W4, W5, and W6, that is, the distance between the third reference touch point 213 and the second reference touch point 222 is the shortest. Therefore, the third reference touch point 213 is output as the touch point associated with the second reference touch point 222. Then, according to the output third reference touch point 213 and the corresponding second reference touch point 222, another second line 420 is formed, as shown in FIG. In practical applications, step S7, step S8, and step S9 are repeatedly executed until the distance between all the reference touch points and all the reference touch points is calculated, and further, the second line 420 is formed correspondingly. On the other hand, the tracking method of the touch point in the embodiment of the present invention is applied to a tracking system as an example. Please refer to FIG. FIG. 10 is a functional block diagram of a tracking system for a touch point according to an embodiment of the invention. The tracking system 100 includes at least one capture unit 110, an arithmetic unit 120, an output unit 130, and a rendering unit 140. The capturing unit 110 is configured to obtain one reference touch point and one I S1 13 201137675 reference touch point respectively in different scanning times, and N and Μ are respectively integers greater than or equal to 2. The computing unit 120 is configured to calculate the distance between each of the reference touch points and the nth reference touch point, and η is an integer from 1 to 。. The output unit 130 is configured to be the shortest distance between the output of the reference touch points and the nth reference touch point. The drawing unit 140 is configured to form a first line according to the output reference touch point and the corresponding nth reference touch point. Further, the tracking system 100 further includes a determining unit 150 for determining whether the defect is greater than or equal to Ν. The computing unit 120 calculates the distance between each of the reference touch points and the nth reference touch point when the determining unit 150 determines that Μ is greater than or equal to Ν, to obtain the nth reference point among the reference touch points. The touch distance is the shortest. In addition, the computing unit 120 is further configured to calculate a distance between each of the reference touch points and the mth reference touch point when the determining unit 150 determines that Μ is less than Ν, where m is an integer of 1 Μ. Through the calculation of the computing unit 120, the tracking system 100 can obtain the shortest distance from the mth reference touch point among the plurality of reference touch points. In addition, the output unit 130 is further configured to output, by the N reference touch points, the shortest distance from the mth reference touch point. The drawing unit 140 is further configured to form a second line according to the output reference touch point and the corresponding mth reference touch point. The tracking method and the tracking system of the touch point according to the embodiment of the present invention, when the number of reference touch points is equal to or greater than the number of reference touch points, is outputted from the plurality of reference touch points and the nth reference The touch point is the shortest distance, and the line is formed according to the output reference touch point and the corresponding nth reference touch point. When the number of reference touch points is less than the number of reference touch points, the output from the plurality of reference touch points and the mth reference touch point distance 201137675 are the shortest, and according to the output reference touch points and corresponding The mth reference touch point forms a line. In this way, the touch point of the shortest distance is used as the next point when the line is twisted, which can avoid the problem of line connection error when the multi-touch point is interlaced, and improve the correctness of the touch operation. Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and the present invention can be modified and modified without departing from the spirit and scope of the present invention. The scope is subject to the definition of the scope of the patent application attached. BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features, advantages and embodiments of the present invention will become more <RTIgt; Flow chart of the tracking method of the handle. Figure 2 is a schematic diagram showing the acquisition of two reference touch points in the first scan time. I Figure 3 shows a schematic diagram of obtaining two reference touch points in the second scan time. Fig. 4 is a view showing the formation of a first line in the scanning pupil plane of Fig. 3. Figure 5 is a schematic diagram showing three reference touch points obtained in the second scan time. Fig. 6 is a view showing the formation of a first line in the scanning pupil plane of Fig. 5. Figure 7 is a schematic diagram showing I S1 15 201137675 for obtaining three reference touch points in the first scan time. Figure 8 is a schematic diagram showing the acquisition of two reference touch points in the second scan time. Fig. 9 is a view showing the formation of a second line in the scan screen of Fig. 8. FIG. 10 is a functional block diagram of a tracking point tracking system according to an embodiment of the invention. [Description of Main Component Symbols] 100: Tracking System 700': Scanning Surface 110: Capture Unit D: Direction 120: Operation Unit S1: Step 130: Output Unit S2: Step 140: Drawing Unit S3: Step 150: Judging Unit S4: Step 200: Scanning face S5: Step 200': Scanning face S6: Step 211: First reference touch point S7: Step 212: Second reference touch point S8: Step 213: Third reference touch Control point S9: Step 221: First reference touch point W1: Distance 222: Second reference touch point W2: Distance 223: Third reference touch point W3: Distance 410: First line W4: Distance 420: Second Line W5: Distance 201137675 500': Scanning face 700: Scanning face