593995 五、發明說明（l) 發明所屬之技術領域 本發明是有關於一種光學量測裝置，特別是有關於一 種可精確量測投影機鏡頭之解像力之光學量測裝置。 先前技術 一般來說，為了評估一投影機鏡頭（pr0jec_tor lens) 之解像力高低，可以採用幾種習知之量測裝置。 例如，請參閱第1圖，當一投影機2經由其鏡頭21向屏 幕11投射一影像S時，此影像S會被位於另一位置之ccd攝 像機12所接收。接著，CCD攝像機12會將其所接收到之類 比影像訊號傳送至一影像處理裝置（未顯示）中，經由影像 處理裝置將類比影像訊號轉換成數位影像訊號後，再傳送 至一電腦（未顯示）中。然後，藉由電腦中之一光學分析程 式來计异此數位影像訊號之MTF (調變轉換函數）值，而mtf 值之高低即可決定此投影機2之鏡頭21的解像力高低。 然而’仍請參閱第1圖，由於cCD攝像機1 2本身即具有 一鏡頭13，故會有鏡頭對焦或光學失真等問題。在CCD攝 像機12經由其鏡頭13接收到來自投影機2之影像s時，此影 像S之解析度就已產生誤差，因此，再經由後續處理分析 所得到之MTF值亦不會準確，而無法精確獲知投影機2之鏡 頭21的真實解像力高低。 發明内容 本發明基本上採用如下所詳述之特徵以為了要解決上593995 5. Description of the invention (l) Technical field to which the invention belongs The present invention relates to an optical measuring device, and more particularly to an optical measuring device capable of accurately measuring the resolution of a projector lens. Prior art Generally, in order to evaluate the resolution of a projector lens (pr0jec_tor lens), several conventional measurement devices can be used. For example, referring to FIG. 1, when a projector 2 projects an image S onto the screen 11 through its lens 21, this image S will be received by the ccd camera 12 located at another position. Then, the CCD camera 12 transmits the analog image signal it receives to an image processing device (not shown), converts the analog image signal into a digital image signal through the image processing device, and then sends it to a computer (not shown) )in. Then, an optical analysis program in the computer is used to calculate the MTF (Modulation Transfer Function) value of the digital image signal, and the mtf value can determine the resolution of the lens 21 of the projector 2. However, please refer to FIG. 1. Since the cCD camera 12 has a lens 13 itself, there are problems such as lens focus or optical distortion. When the CCD camera 12 receives the image s from the projector 2 through its lens 13, the resolution of this image S has an error. Therefore, the MTF value obtained through subsequent processing and analysis will not be accurate and cannot be accurate. It is known whether the true resolution of the lens 21 of the projector 2 is high or low. SUMMARY OF THE INVENTION The present invention basically adopts the features detailed below to solve the above problems.
0535-9359TWF(Nl);A91338;HAWD〇NG.ptd 第 5 頁' ' ---- 593995 五、發明說明（2) 述之問題。也就是說，本發明適用於量測一投影機鏡頭之 解像力’同時’該投影機鏡頭係供投射出一影像，本發明_ 包括一屏幕；一影像擷取單元，設置於該屏幕之上，係用 ^ 以接收投射至該屏幕之該影像，並輸出對應於該影像之一 類比影像訊號；一均質濾鏡，設置於該屏幕上，姐且對應 於該影像擷取單元之位置，係用以衰減及控制該影像之亮 度；以及一資料處理模組，連接於該影像擷取單元，係用 * 以接收該類比影像訊號並依此計算出該投影機鏡頭之解像 ’ 力。 同時’根據本發明之光學量測裝置，該資料處理模組 更包括一影像處理裝置以及一電腦，該影像處理裝置係用 _ 以轉換該類比影像訊號成一數位影像訊號，並輸出該數位 影像訊號，該電腦係用以接收該數位影像訊號，並計算出 e亥才又衫機鏡頭之調變轉換函數值（m〇(juiati〇n transfer function value) 〇 又在本發明中，該影像擷取單元係為—CCD感測器。 -又在本發明中，該CCD感測器係具有64〇 χ 48〇像素以 、 上之解析度。 又在本發明中，該影像處理裝置係具有64〇χ 48〇像素 以±之解析度。 、 又在本發明中，更包括一支座，連接於該屏幕，係用 _ 以支撐該屏幕。 為使本發明之上述目的、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做詳細說明。0535-9359TWF (Nl); A91338; HAWD〇NG.ptd Page 5 '' ---- 593995 5. The problem described in the description of the invention (2). That is, the present invention is suitable for measuring the resolution of a projector lens 'while' the projector lens is used to project an image, the present invention includes a screen; an image capture unit is disposed on the screen, Use ^ to receive the image projected to the screen and output an analog image signal corresponding to the image; a homogeneous filter set on the screen, and corresponding to the position of the image capture unit, use To attenuate and control the brightness of the image; and a data processing module, connected to the image capture unit, uses * to receive the analog image signal and calculates the resolution of the projector lens based on it. At the same time, according to the optical measuring device of the present invention, the data processing module further includes an image processing device and a computer. The image processing device uses _ to convert the analog image signal into a digital image signal, and outputs the digital image signal The computer is used to receive the digital image signal and calculate the modulation transfer function value of the camera lens (m〇 (juiati〇n transfer function value)). In the present invention, the image capture The unit system is a CCD sensor. In the present invention, the CCD sensor has a resolution of 64 × 480 pixels or more. In the present invention, the image processing device has 64. χ 48〇 pixels with a resolution of ±. Also in the present invention, a stand is connected to the screen, and _ is used to support the screen. In order to make the above objects, features and advantages of the present invention more obvious It is easy to understand. The preferred embodiments are described in detail below with reference to the accompanying drawings.
0535-9359TW(Nl);A91338;HAWD0NG.ptd " β f ' ----- 593995 五、發明說明（3) 實施方式 炫配合圖式說明本發明之較佳實施例。 請參閱第2 A圖及第2B圖，本實施例之光學量測裝置 100主要包括有一屏幕110、複數個影像擷取單元（例如一 CCD感測器）120、複數個均質濾鏡（neutral density filter)130以及一資料處理模組14〇。影像擷取單元12〇與 均質濾鏡130均是設置於屏幕11〇之上，並且均質濾鏡13〇 係對應於影像擷取單元丨2〇。資料處理模組14〇是連接於影 像擷取單元1 2 〇。 當一投影機200經由其鏡頭21〇投射一影像s至屏幕11〇 上時’設置於屏幕110上之複數個影像擷取單元12〇便會透 過均質遽鏡1 3 0接收此影像s，然後輸出對應於影像s之一 類比影像訊號。接著，資料處理模組丨4 〇會接收從影像擷 取單元1 2 0傳送過來之類比影像訊號，並根據此類比影像 訊號來計算投影機20 0之鏡頭210的解像力。 詳細的來說，資料處理模組丨4 〇具有一影像處理裝置 (frame grabber，未顯示）以及一電腦（未顯示）。資料處 理模組140即是藉由影像處理裝置來接收從影像擷取單元 1 2 0傳送過來之類比影像訊號，並且影像處理裝置會將此 類比影像訊號轉換成一數位影像訊號。然後，影像處理裝 置會再將此數位影像訊號輸出至電腦中，並經由電腦中之 一光學分析程式來計算此數位影像訊號之調變轉換函數值 (modulation transfer function value ， MTF value)，0535-9359TW (Nl); A91338; HAWD0NG.ptd " β f '----- 593995 V. Description of the invention (3) Embodiments The preferred embodiments of the present invention will be described with the accompanying drawings. Please refer to FIG. 2A and FIG. 2B. The optical measurement device 100 in this embodiment mainly includes a screen 110, a plurality of image capturing units (such as a CCD sensor) 120, and a plurality of homogeneous filters. filter) 130 and a data processing module 14o. The image capturing unit 12 and the homogenizing filter 130 are both disposed on the screen 11 and the homogenizing filter 13o corresponds to the image capturing unit 20. The data processing module 14 is connected to the image capturing unit 12. When a projector 200 projects an image s onto the screen 11 through its lens 21, a plurality of image capturing units 120 provided on the screen 110 will receive the image s through the homogeneous mirror 1 30, and then Output an analog image signal corresponding to image s. Then, the data processing module 丨 4 will receive the analog image signal transmitted from the image capturing unit 120 and calculate the resolution of the lens 210 of the projector 200 according to the analog image signal. In detail, the data processing module 410 has an image processing device (frame grabber, not shown) and a computer (not shown). The data processing module 140 receives the analog image signal transmitted from the image capturing unit 120 by the image processing device, and the image processing device converts the analog image signal into a digital image signal. Then, the image processing device outputs the digital image signal to the computer, and calculates a modulation transfer function value (MTF value) of the digital image signal through an optical analysis program in the computer.
0535-9359TWF(Nl);A91338;HAWDONG.ptd 第7頁 593995 五、發明說明（4) 此經分析求得之調變棘換函數佶夕‘， > 丁旧茭锝秧由数值之向低即代表投影機200 之鏡頭210的確實解像力高低。 至於本實施例採用均質遽鏡之原因則說明如下。由於 為了要避免習知之CCD攝像機之鏡頭失真等問題，故本實 施例乃採用不具鏡頭之CCD感測器（影像擷取單元12〇)，並 將其設置於屏幕上，以減小其所接收影像之光學誤差。然 而，當CCD感測器失去鏡頭之保護後，亦即失去鏡頭之光 圈保護’ CCD感測器所接收到的影像全都是飽和的白色影 像。而均質濾鏡本身具有類似鏡頭光圈之功能，若在CCD 感測器之前方設置-均質濾鏡，則可衰減及控制入射影像 之亮度或光量，以符合CCD感測器所能接受之入射影像之 1強度範圍。此外’因為均質濾鏡是一種平面濾鏡，故不 ^改變光的行進方向，也就不會造成入射影像的失真問 題0 ，得，意的是，本實施例亦可以同時採用複數個具有 不同焭度衰減比之均質濾鏡，以使(：(：1)感測器能夠接收不 同亮度範圍之影像。 此外，在本實施例中，影像擷取單元（CCD感測器）丨20 ^影像處理裝置皆可具有64〇 χ 48〇像素以上之解析度。同 時，光學量測裝置1〇〇亦可具有連接於屏幕u〇之一= 15〇，以支撐屏幕110。 〜雖然本發明已以較佳實施例揭露於上，然其並非用以 限定本發明，任何熟習此項技藝者，在不脫離本發明之精 神和範圍内，當可作些許之更動與潤飾，因此本發明之保0535-9359TWF (Nl); A91338; HAWDONG.ptd Page 7 593995 V. Description of the invention (4) The modulation spine transfer function 佶 xi 'obtained from the analysis, > That is, the true resolution of the lens 210 of the projector 200. The reason for using a homogeneous mirror in this embodiment is described below. In order to avoid problems such as lens distortion of the conventional CCD camera, this embodiment uses a CCD sensor (image capture unit 12) without a lens, and sets it on the screen to reduce its reception. Optical error of the image. However, when the CCD sensor loses the protection of the lens, that is, it loses the aperture protection of the lens. The images received by the CCD sensor are all saturated white images. The homogeneous filter itself has a function similar to a lens aperture. If a homogeneous filter is set in front of the CCD sensor, it can attenuate and control the brightness or light amount of the incident image to meet the incident image that the CCD sensor can accept. 1 intensity range. In addition, because the homogeneous filter is a flat filter, it does not change the traveling direction of the light, so it will not cause the problem of distortion of the incident image. 0. It is interesting that this embodiment can also use a plurality of different A homogeneous filter with a high attenuation ratio so that the (:(: 1) sensor can receive images of different brightness ranges. In addition, in this embodiment, the image capture unit (CCD sensor) 20 The processing devices can all have a resolution of 64 × 480 pixels or more. At the same time, the optical measurement device 100 can also have one of the screen u0 = 15 ° to support the screen 110. Although the present invention has been The preferred embodiment is disclosed above, but it is not intended to limit the present invention. Any person skilled in the art can make some changes and retouches without departing from the spirit and scope of the present invention.
593995 五、發明說明（5) 護範圍當視後附之申請專利範圍所界定者為準。 II·關 第9頁 0535-9359TWF(Nl);A91338;HAWD0NG.ptd 593995 圖式簡單說明 第1圖係一習知之投影機鏡頭之光學量測方式之示意 圖； 第2A圖係本發明之投影機鏡頭之光學量測方式之示意 圖；以及 第2B圖係顯示根據第2 A圖之光學量測裝置之前視示意 符號說明 1〜習知之投影機鏡頭之光學量測裝置 2〜投影機 11〜屏幕 12〜CCD攝像機 13〜鏡頭 21〜鏡頭 1 0 0〜光學量測裝置 110〜屏幕 120〜影像擷取單元 130〜均質濾鏡 140〜資料處理模組 150〜支座 200〜投影機 21 0〜鏡頭 S〜影像593995 V. Description of Invention (5) The scope of protection shall be determined by the scope of the attached patent application. II · Off Page 9 0535-9359TWF (Nl); A91338; HAWD0NG.ptd 593995 The diagram is a schematic illustration of the optical measurement method of a conventional projector lens; Fig. 2A is a projector of the present invention Schematic diagram of the optical measurement method of the lens; and FIG. 2B is a schematic diagram showing the front view of the optical measurement device according to FIG. 2A. The conventional optical lens measurement device of the projector lens 2 ~ projector 11 ~ screen 12 ~ CCD camera 13 ~ lens 21 ~ lens 1 0 0 ~ optical measuring device 110 ~ screen 120 ~ image acquisition unit 130 ~ homogeneous filter 140 ~ data processing module 150 ~ stand 200 ~ projector 21 0 ~ lens S ~image
0535-9359TWF(Nl);A91338;HAWDONG.ptd 第10頁0535-9359TWF (Nl); A91338; HAWDONG.ptd Page 10