200839222 九、發明說明 【發明所屬之技術領域】 本發明係關於樹脂膜上所賦予的標記之檢測方法。詳 而言之，係關於爲了標示光學膜等的樹脂膜之缺陷位置等 而賦予的標記之檢測方法。 【先前技術】 光學膜等的樹脂膜，通常是製造成具有一定寬度之長 帶狀，以此狀態實施各種處理後，捲繞在輥上，而以原料 膜的狀態來保管。將來，再依據製品規格而從原料膜切割 出既定形狀的膜片（例如參照日本特開2001-305070號公 報）。 關於樹脂膜之缺陷檢測，通常也是以帶狀狀態來進行 ，爲了容易辨識缺陷部分，係用顫頭筆或噴墨等來賦予標 記。當切割出的膜片具有缺陷時，即使是肉眼難以辨識的 缺陷，由於賦予標記故相當容易辨別，而容易從製品剔除 〇 另一方面，爲了將切割出之具有缺陷的膜片剔除，又 爲了避開缺陷而高效率地切出膜片，期望能提供可高精度 自動檢測樹脂膜上賦予的標記之檢測方法。 已知的標記檢查方法，係將來自彩色攝影機之R、G 、B訊號予以二値化而得三種影像，根據這三種影像來判 定標記的顏色、大小（參照日本特開平6 - 5 0 7 3 5號公報） 200839222 然而，在該習知的方法，因樹脂膜之搬運時的振動、 筆按壓時之壓力變動、墨水之消耗等等，而造成標記變淡 或變模糊的情形等，可能導致檢測精度降低，又當樹脂膜 上形成有色圖案的情形，可能無法檢測出標記，因此期望 能提供更高精度的檢測方法。 【發明內容】 本發明之目的在於，提供一種爲了標示缺陷位置等而 賦予在樹脂膜上的標記之高精度檢測方法。 本申請發明人等，針對爲了標示缺陷位置等而賦予在 樹脂膜上的標記之高精度檢測方法，進行深入探討的結果 發現，對賦予黑色系以外的顏色標記之樹脂膜用光照射， 將其透過影像或反射影像用彩色CCD攝影機拍攝，將來 自彩色CCD攝影機之RGB訊號用HSV表色系處理後，將 所得像素之色相（Η )、彩度（S )及明度（V )的範圍分 別用256階表示，根據可符合：依所賦予的標記顏色而設 定之色相（Η)的範圍、彩度（S)在100〜225的範圍及 明度（V)在220〜2 5 5的範圍之像素數目，來檢測出該 標記，藉此可高精度檢測出所賦予的標記，而到達本發明 之完成。 本發明之標記之檢測方法，係在樹脂膜用黑色系以外 的顏色賦予的標記之檢測方法，係對賦予標記之樹脂膜用 光照射，將其透過影像或反射影像用彩色CCD攝影機拍 攝，將來自彩色CCD攝影機之RGB訊號用HSV表色系處 200839222 理後，將所得像素之色相（Η )、彩度（ 的範圍分別用256階表示，根據可符合： 顏色而設定之色相（Η )的範圍、彩度（ 的範圍及明度（V)在220〜25 5的範圍 檢測出該標記。 前述標記之檢測方法中，以25 6階g 的範圍，在紅色系標記的情形爲〇〜20 ί 藍色系標記的情形爲1 3 5〜1 75，在綠色 75 〜1 1 5 ° 又前述標記之檢測方法中，當根據符 素而求出之對應於標記的面積爲設定面積 形，判定是所賦予之標記。 【實施方式】 關於樹脂膜，可列舉：偏光膜、相位 膜等的光學膜；聚烯烴膜、丙烯酸膜、聚 限於此。 在本發明，係在樹脂膜賦予黑色系以 來進行檢測。標記之賦予方法是依公知方 ，是使用氈頭筆、噴墨等之人工或例如 3 05 0 70號公報所記載的方法來自動進行。 使用黑色、灰黑色系之標記時，除檢 外，可除去之附著物等也會被檢測出，因 檢測出附著物之紅色系、藍色系、綠色系 S )及明度（V ) 依所賦予的標記 S )在 1 00 〜225 之像素數目，來 Ε示之色相（Η ) ξ 23 5 〜25 5，在 系標記的情形爲 合前述範圍之像 的7 0 %以上的情 差膜、光學補償 楓膜等等，但不 外的顏色之標記 法來進行，通常 曰本特開 200 1 - 測對象之標記以 此是賦予不容易 等之黑色系以外 -6 - 200839222 的顏色之標記。當樹脂膜上形成有色圖案的情形’係賦予 和圖案的顏色不同之標記。 標記形狀沒有特別的限疋’通常是賦予線狀標5己。 關於所賦予的標記之拍攝方法’係和檢測樹脂膜的缺 陷時等同樣的，對樹脂膜用光照射，將其透過影像或反射 影像用彩色C C D攝影機拍攝。就光而言’可使用可見光 、紫外線等等。在用螢光筆來賦予標記的情形，係照射紫 外線。關於光源’可使用白色燈、螢光燈、紫外線燈等等 〇 使用黑白攝影機時’依標記顏色之不同可能無法檢測 出標記，因此在本發明，係賦予黑色系以外的標記，再用 彩色CCD攝影機來拍攝。當樹脂膜呈透明性的情形，將 透過影像或反射影像用彩色CCD攝影機拍攝，當呈不透 明的情形，拍攝其反射影像。 將來自彩色CCD攝影機之RGB訊號用影像處理裝置 依HSV表色系進行處理，根據所得像素之色相（Η )、彩 度（S )及明度（V )的範圍可符合設定範圍之像素來檢 測出標記。影像處理可使用市售裝置來進行。 由於所賦予的標記顏色已知，可配合所賦予之標記顏 色來設定色相（Η )的範圍。其範圍用2 5 6階表示（以下 相同），例如，在紅色系標記的情形爲〇〜20或23 5〜 2 5 5，較佳爲0〜9或2 5 0〜2 5 5 ;在藍色系標記的情形爲 135〜175，較佳爲141〜169 ;在綠色系標記的情形爲75 〜115，較佳爲 80〜108。不符合這些範圍的像素，就不 200839222 是構成檢測對象的顏色標記之像素。 彩度（s )的範圍和標記顏色無關，係在100〜225， 較佳爲105〜220 ;明度（V )範圍也和標記顏色無關，係 在220〜255，較佳爲245〜255。若縮小這些範圍，可能 無法檢測出變淡或變模糊的標記。 根據符合上述範圍之像素，來求出相當於標記之面積 。1像素大小爲已知，因此可由像素數目來求出面積。通 常，所賦予之標記面積、或拍攝的標記部分的面積爲已知 ，而將該面積當作設定面積。 由上述像素所求出的面積爲上述設定面積之70%以上 ，較佳爲80 %以上時，判定是所賦予的標記。雖然也能根 據像素求出標記的形狀來進行判定，但求取面積的方法較 爲容易。 第1圖係顯示本發明使用的裝置的一例之示意圖。藉 由前段之缺陷檢測裝置及標記裝置（未圖示），來檢測出 樹脂膜的缺陷，且爲了標示缺陷的位置而在樹脂膜賦予黑 色系以外的顏色之標記後，捲繞在輥上進行保管。 從保管中之捲繞著樹脂膜1 (賦予標記）的輥2，將 樹脂膜1回捲後搬運至膜切斷裝置3 (空心箭頭方向）。 切割出之膜片4，係藉由搬運輸送機5、6及支承輥7搬 運至區分裝置8。 從配置於支承輥7間之光源9照射光’將其透過影像 用彩色CCD攝影機10拍攝。將來自彩色CCD攝影機之 RGB訊號用影像處理裝置1 1實施HSV表色系處理，所得 200839222 像素之色相（Η )、彩度（S )及明度（V )的範圍，在賦 予紅色系標記的情形，分別用2 5 6階表示，根據可符合： 色相（H)在0〜20或235〜255的範圍、彩度（S)在 100〜225的範圍及明度（V)在220〜25 5的範圍之像素 ，來檢測出該標記。根據符合上述範圍之像素所求出之對 應於標記的面積爲設定面積之70%以上的情形，判定是所 賦予的標記。 將處理資料儲存於控制裝置1 2，視需要顯示於記錄 器1 3。 判定爲賦予標記之膜片，根據搬運速度檢測手段（未 圖示）之樹脂膜的搬運速度，在區分裝置8和未賦予標記 之膜片進行區分。 以下顯示本發明的實施例，但本發明並不限於這些。 實施例1 在偏光膜（住友化學製）之被檢查出的缺陷附近，用 紅色的氈頭筆（Pentel製）賦予線狀標記（長約23mm， 寬約3 m m，面積約6 9 m m2 )。 從該膜的下方用白色光（光源：螢光燈面光源，佳能 製）照射，將其透過影像，從上方使用影像感測器/影像 處理裝置之超高速數位多重攝影機CV-3 000 (基恩斯製） ’用彩色CCD攝影機（200萬像素）拍攝，將其RGB訊 號實施H S V表色系處理。又配置成，只拍攝標記部的前 端部（長2.5mm )。 -9 - 200839222 以2 5 6階表示之色相（Η )的設定範圍爲〇〜2 0或 235〜255，彩度（S)的設定範圍爲1〇〇〜225，明度（V )的設定範圍爲220〜255。 又拍攝的標記所對應的設定面積爲5mm2 (寬2mm X 長 2.5mm ) 。 結果，可檢測出上述賦予的標記。所得像素之色相（ H)範圍爲254〜255，彩度（S)範圍爲173〜213，明度 (V)範圍爲225〜255，都符合設定的範圍。 根據符合該設定範圍的像素面積（〇.〇52mm2)和其數 目來求出對應於標記的面積，結果爲4mm2，佔設定面積 5 m m 2 之 8 0 〇/〇 〇 又當色相（Η )的設定範圍爲2 5 3〜2 5 4時，根據符 合該範當之像素求出的面積未達設定面積之70%，因此無 法檢測出所賦予的標記。又當彩度（S )的設定範圍爲 1 53〜1 93時，同樣地無法檢測出所賦予的標記。 實施例2 將實施例1所使用之紅色氈頭筆予以消耗後，賦予變 淡的線狀標記（長約2 3 m m，寬約3 m m，面積約6 9 m m 2 ) ，和實施例1同樣地進行標記之檢測。 結果，可檢測出上述賦予的標記。所得像素之色相（ H)範圍爲254，彩度（S)範圍爲174〜197，明度（V) 範圍爲234〜249，都符合設定的範圍。根據符合該設定 範圍的像素面積（ 0.052mm2)和其數目來求出對應於標記 -10- 200839222 的面積，結果爲4mm2，佔設定面積5mm2之80%。 又當彩度（S )的設定範圍爲154〜177時，根據符合 該範當之像素求出的面積未達設定面積之70%，因此無法 檢測出所賦予的標記。又當明度（V )的設定範圍爲2 1 4 〜229時，同樣地無法檢測出所賦予的標記。 依據本發明，即使樹脂膜上所賦予之標記變淡或變模 糊的情形等，仍能高精度地進行檢測。 【圖式簡單說明】 第1圖係顯示本發明所使用的裝置的一例之示意圖。 【主要元件符號說明】 1 :樹脂膜 2 :輥 3 z膜切斷裝置 4 :膜片 5、6 :搬運輸送機 7 :支承輥 8 ·區分裝置 9 :光源 10 :彩色CCD攝影機 11 :影像處理裝置 1 2 :控制裝置 1 3 :記錄器 -11 -200839222 IX. Description of the Invention [Technical Field of the Invention] The present invention relates to a method for detecting a mark imparted on a resin film. Specifically, it relates to a method of detecting a mark imparted to mark a defect position of a resin film such as an optical film. [Prior Art] A resin film such as an optical film is usually formed into a long strip shape having a constant width. After performing various treatments in this state, it is wound around a roll and stored in a state of a raw material film. In the future, a film having a predetermined shape is cut out from the raw material film in accordance with the product specifications (for example, refer to Japanese Laid-Open Patent Publication No. 2001-305070). The defect detection of the resin film is usually carried out in a strip state, and in order to easily identify the defective portion, the mark is given by a trunometer or ink jet. When the cut film has defects, even defects which are difficult to be recognized by the naked eye are easily discerned due to the imparting of the mark, and are easily removed from the product. On the other hand, in order to remove the cut defective film, It is desirable to provide a detection method capable of automatically detecting a mark imparted on a resin film with high precision by avoiding defects and cutting out the film efficiently. The known mark inspection method is to convert the R, G, and B signals from the color camera to obtain three kinds of images, and determine the color and size of the mark according to the three images (refer to Japanese Patent Laid-Open No. 6-5507). Japanese Patent Publication No. 5, pp. No. 5, </ RTI> </ RTI> </ RTI> </ RTI> </ RTI> </ RTI> </ RTI> </ RTI> </ RTI> </ RTI> </ RTI> </ RTI> </ RTI> </ RTI> When the detection accuracy is lowered and the colored pattern is formed on the resin film, the mark may not be detected, and therefore it is desirable to provide a more accurate detection method. SUMMARY OF THE INVENTION An object of the present invention is to provide a high-precision detecting method for imparting a mark on a resin film in order to mark a defect position or the like. In the inventors of the present invention, in order to provide a high-precision detection method for imparting a mark on a resin film to mark a defect position or the like, it has been found that the resin film to which a color mark other than the black color is applied is irradiated with light. The image is captured by a color CCD camera through the image or the reflected image, and the RGB signals from the color CCD camera are processed by the HSV color system, and the hue (Η), chroma (S), and lightness (V) ranges of the obtained pixels are respectively used. 256-step representation, according to the range of hue (Η) set according to the color of the mark given, the range of chroma (S) in the range of 100 to 225, and the range of brightness (V) in the range of 220 to 2 5 5 The number is detected to detect the mark, whereby the assigned mark can be detected with high precision, and the completion of the present invention is reached. The method for detecting a mark according to the present invention is a method for detecting a mark applied to a resin film other than a black color, and the resin film to which the mark is applied is irradiated with light, and the image is transmitted through the image or the reflected image is captured by a color CCD camera. The RGB signal from the color CCD camera is determined by the HSV color system at 200839222, and the hue (Η) and chroma (the range of the obtained pixel are expressed by 256 steps respectively, according to the hue (Η) which can be set according to the color: The range, the range of chroma (the range and the brightness (V) are detected in the range of 220 to 25 5 . In the detection method of the above-mentioned mark, the range of 25 6 g, in the case of the red mark is 〇 20 20 . In the case of the blue mark, it is 1 3 5 to 1 75, and in the case of the green mark 75 to 1 1 5 °, in the detection method of the above-mentioned mark, the area corresponding to the mark obtained from the voxel is the set area shape, and the judgment is [Embodiment] The resin film may be an optical film such as a polarizing film or a phase film; the polyolefin film, the acrylic film, and the polymerization are limited thereto. In the present invention, the resin film is black. The method of applying the mark is performed by a method using a felt pen, an inkjet, or the like, or a method described in, for example, the Japanese Patent Publication No. 2003/70. In addition to the inspection, the removable attachments and the like are also detected, because the red, blue, and green S) and the lightness (V) of the attached matter are detected according to the mark S) at 100 〜 The number of pixels in 225, to show the hue (Η) ξ 23 5 ~ 25 5, in the case of the system mark, more than 70% of the image of the above range of the film, optical compensation maple film, etc., but not The marking method of the outer color is usually carried out. Generally, the mark of the object is measured. This is a mark of the color of the -6 - 200839222 which is not easy to be black. The case where a colored pattern is formed on the resin film is a mark which gives a different color to the pattern. There is no special limit to the shape of the mark, which is usually given to the line mark. In the same manner as in the case of detecting the defect of the resin film, the resin film is irradiated with light, and the transmitted image or the reflected image is imaged by a color C C D camera. In terms of light, visible light, ultraviolet light, and the like can be used. In the case where a mark is given by a fluorescent pen, the ultraviolet rays are irradiated. Regarding the light source, white light, fluorescent light, ultraviolet light, etc. can be used. When a black and white camera is used, the mark may not be detected depending on the color of the mark. Therefore, in the present invention, a mark other than the black type is given, and a color CCD is used. Camera to shoot. When the resin film is transparent, it is imaged by a color CCD camera through an image or a reflection image, and when it is opaque, the reflected image is taken. The RGB signal from the color CCD camera is processed by the image processing device according to the HSV color system, and the pixels of the obtained pixel are detected according to the range of the hue (Η), chroma (S), and brightness (V) of the obtained pixel. mark. Image processing can be performed using commercially available devices. Since the color of the mark imparted is known, the range of the hue (Η) can be set in accordance with the mark color imparted. The range is expressed by 2 5 6 (the same applies hereinafter), for example, in the case of a red mark, 〇20 or 23 5 to 2 5 5 , preferably 0 to 9 or 2 5 0 to 2 5 5 ; The color mark is 135 to 175, preferably 141 to 169; in the case of the green mark, it is 75 to 115, preferably 80 to 108. For pixels that do not meet these ranges, 200839222 is a pixel that constitutes the color mark of the detection object. The range of chroma (s) is independent of the color of the mark, and is in the range of 100 to 225, preferably 105 to 220; the range of brightness (V) is also independent of the color of the mark, and is in the range of 220 to 255, preferably 245 to 255. If you narrow these ranges, you may not be able to detect faded or blurred marks. The area corresponding to the mark is obtained from the pixels that satisfy the above range. The 1 pixel size is known, so the area can be obtained from the number of pixels. Usually, the area of the mark given, or the area of the marked portion to be photographed is known, and the area is regarded as the set area. When the area obtained by the pixel is 70% or more of the set area, and preferably 80% or more, it is determined that the mark is given. Although it is also possible to determine the shape of the mark based on the pixel, it is easier to determine the area. Fig. 1 is a schematic view showing an example of a device used in the present invention. The defect detecting device and the marking device (not shown) in the preceding stage detect the defect of the resin film, and mark the color of the resin film with a mark other than the black color in order to mark the position of the defect, and then wind it on the roller. storage. The resin film 1 is rewinded from the roll 2 in which the resin film 1 (marked) is wound during storage, and then conveyed to the film cutting device 3 (in the direction of the hollow arrow). The cut diaphragm 4 is transported to the sorting device 8 by the transport conveyors 5, 6 and the backup roller 7. Light is emitted from the light source 9 disposed between the backup rolls 7 and transmitted through the image by the color CCD camera 10. The RGB signal from the color CCD camera is subjected to the HSV color system processing by the image processing device 1 1 to obtain a range of hue (Η), saturation (S), and lightness (V) of the 200839222 pixel, which is given to the red mark. , respectively, expressed in 2 5 6 steps, according to which: hue (H) in the range of 0 to 20 or 235 to 255, chroma (S) in the range of 100 to 225 and brightness (V) in the range of 220 to 25 5 The pixels of the range are used to detect the mark. When it is determined that the area of the mark corresponding to the pixel in the above range is 70% or more of the set area, it is determined that the mark is given. The processing data is stored in the control device 12 and displayed on the recorder 13 as needed. It is determined that the film to which the mark is applied is distinguished between the sorting device 8 and the film to which the mark is not provided, based on the conveyance speed of the resin film of the conveyance speed detecting means (not shown). The embodiments of the present invention are shown below, but the present invention is not limited to these. Example 1 A linear felt mark (a length of about 23 mm, a width of about 3 mm, and an area of about 6 9 m 2 ) was imparted with a red felt pen (manufactured by Pentel) in the vicinity of a defect detected by a polarizing film (manufactured by Sumitomo Chemical Co., Ltd.). . Ultra-high-speed digital multi-camera CV-3 000 (Kiens) that uses white light (light source: fluorescent surface light source, manufactured by Canon) from the bottom of the film and transmits it through the image, using an image sensor/image processing device from above. System] 'Photographed with a color CCD camera (2 million pixels), the RGB signal is applied to the HSV color system. Further, it is arranged such that only the front end portion (length 2.5 mm) of the mark portion is photographed. -9 - 200839222 The setting range of hue (Η) expressed in 2 5 6 steps is 〇~2 0 or 235~255, and the setting range of chroma (S) is 1〇〇~225, the setting range of brightness (V) For 220~255. The set area corresponding to the mark taken is 5mm2 (width 2mm X length 2.5mm). As a result, the label given above can be detected. The obtained pixels have a hue (H) ranging from 254 to 255, a chroma (S) range of 173 to 213, and a brightness (V) ranging from 225 to 255, all meeting the set range. The area corresponding to the mark is obtained according to the pixel area (〇.〇52 mm2) and the number thereof, and the result is 4 mm2, which accounts for 8 0 〇/〇〇 of the set area of 5 mm 2 and is hue (Η). When the setting range is 2 5 3 to 2 5 4 , the area obtained by the pixel corresponding to the standard is less than 70% of the set area, and thus the given mark cannot be detected. Further, when the setting range of the saturation (S) is 1 53 to 1 93, the given mark cannot be detected in the same manner. Example 2 After the red felt pen used in Example 1 was consumed, a light-line mark (a length of about 23 mm, a width of about 3 mm, and an area of about 6 9 mm 2 ) was imparted, and the same as in the first embodiment. The detection of the mark is performed. As a result, the label given above can be detected. The obtained pixel has a hue (H) range of 254, a chroma (S) range of 174 to 197, and a brightness (V) range of 234 to 249, all meeting the set range. The area corresponding to the mark -10- 200839222 is obtained from the pixel area (0.052 mm2) which satisfies the set range and the number thereof, and the result is 4 mm2, which accounts for 80% of the set area of 5 mm2. Further, when the setting range of the saturation (S) is 154 to 177, the area obtained by the pixel satisfying the standard is less than 70% of the set area, and thus the given mark cannot be detected. Further, when the setting range of the brightness (V) is 2 1 4 to 229, the given mark cannot be detected in the same manner. According to the present invention, even when the mark imparted on the resin film is lightened or the paste is changed, the detection can be performed with high precision. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing an example of a device used in the present invention. [Description of main component symbols] 1 : Resin film 2 : Roll 3 z film cutting device 4 : Diaphragm 5 , 6 : Transport conveyor 7 : Support roller 8 · Distinguishing device 9 : Light source 10 : Color CCD camera 11 : Image processing Device 1 2: Control device 1 3 : Recorder-11 -