focal distance [length] 【物理學】焦距。
[length] 【物理學】焦距。 “focal“ 中文翻譯： adj. 1.【物理學】焦點的，(集中)在點上的，有焦點 ...“distance“ 中文翻譯： n. 1.距離，路程。 2.遠隔，遠離；遠處，遠方。 3 ...“focal distance, focal length“ 中文翻譯： 焦距“anterior focal distance“ 中文翻譯： 主焦距,前焦距“anterior principal focal distance“ 中文翻譯： 前主焦距,主焦距“anterior vertex focal distance“ 中文翻譯： 前焦距,前頂焦距“back focal distance“ 中文翻譯： 后頂焦距,后焦距; 后截距“effective focal distance“ 中文翻譯： 有效焦距“flange focal distance“ 中文翻譯： 法蘭焦距; 基面焦距; 肩焦距; 鏡座距，指鏡頭座與菲林平面的距離“focal distance of objective“ 中文翻譯： 物鏡焦距“focal distance of the monochromater“ 中文翻譯： 單色器焦距“focal distance ratio“ 中文翻譯： 焦距比“focal film distance“ 中文翻譯： 焦點膠片距離“focal spot-film distance“ 中文翻譯： 焦點膠片距離“focal-film distance“ 中文翻譯： 焦點-膠片距離,焦點膠片距離“front focal distance“ 中文翻譯： 前焦距,前頂焦距“front vertex focal distance“ 中文翻譯： 前頂焦距“posterior focal distance“ 中文翻譯： 第二主焦距,次焦距“posterior principal focal distance“ 中文翻譯： 后主焦距,次焦距“posterior vertex focal distance“ 中文翻譯： 后頂焦距,后焦距“primary focal distance“ 中文翻譯： 前主焦距,主焦距“primary principal focal distance“ 中文翻譯： 第一主焦距,主焦距“principal focal distance“ 中文翻譯： 主焦距離“secondary focal distance“ 中文翻譯： 后主焦距,次焦距“secondary principal focal distance“ 中文翻譯： 第二主焦距,次焦距
focal infection |
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In course of auto - focusing , the paper takes the sum of the square of gray difference as focal distance evaluation function to decided that image is in focus or not quickly and put forward an effective auto - focus searching way based on threshold value and curve fitting . these improve speed and precision of auto - focusing 在圖象式自動聚焦過程中，論文采用了圖象的灰度差分的絕對值之和的平方作為焦距評價函數，解決了是否正確聚焦的快速判斷問題；采用了一種行之有效的基于閾值和曲線擬合的自動聚焦搜索方式，使聚焦速度和精度都得到了很大的提高。 |
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1 , cut over a head : bring up to combine the applied technique most and early for the toshiba , and is also current usage to is the most extensive . he adopts a laser head , and prepare the different slice of 2 focal distances the sony for cut over , passing the conversion differently focusing the coming respectively reading dvd with cd , its shape looking with double head to resemble respectively , because can see two sets focuse the , laser head to interiorly can t see . he reads the signal quantity is higher , but because of want the conversioning to focuse the , therefore the cost belong to the inside and so forth of level , and recognize the dish speed slow , same the implicit mechanical trouble rate is high 1切換雙鏡頭：為toshiba最早提出并應用的技術，也是目前使用最廣泛的。他采用一個激光頭，分別準備2個焦距不同的鏡片切換，通過轉換不同的聚焦鏡來分別讀取dvd和cd ，它的外形看起來與雙頭的sony相似，因為只能看到二組聚焦鏡，激光頭在內部看不見。他讀取信號質量較高，但由于要轉換聚焦鏡，所以成本屬于中等水平，認盤速度較慢，同樣隱含的機械故障率比較高。 |
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The company develops the production the panoramic camera to use 120 or220 roll films , the lens focal distance scope : 28 - 300mm , the fuselageuses the pure metal numerical control processing , but preciselyestablishes the shooting angle , the entire automatic attire volume , receives the volume , and may control remotely the photography , in thephotography may the automatic compensation exposure ; the panoramicpicture enlarger and bright room panoramic picture making anenlargement machine may use in 80 cm length the panoram negative , extremely conveniently manufactures each kind of width the panoramicpicture 公司研制生產的全景照相機使用120或220膠卷，鏡頭焦距范圍: 28 - 300mm ，機身采用全金屬數控加工，可精確設定拍攝角度，全自動裝卷收卷，并可遙控拍攝，拍攝中可自動補償曝光全景照片放大機和明室全景照片擴印機可用cm長度內的全景底片，非常方便地制作各種寬度的全景照片。 |
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In course of auto - focusing , the paper takes the sum of the square of gray difference as focal distance evaluation function to decided that image is in focus or not quickly and put forward an effective auto - focus searching way based on threshold value and curve fitting . these improve speed and precision of auto - focusing 在自動聚焦過程中，論文采用了圖象的灰度差分的絕對值之和的平方作為焦距評價函數，解決了是否正確聚焦的快速判斷問題；采用了一種行之有效的基于閾值和曲線擬合的自動聚焦搜索方式，使聚焦速度和精度都得到了很大的提高。 |
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This multi - purpose optical metering system had adopted the twyman - green interferometric system as its center , containing an advanced digital wave surface interferometry and a kind of homodyne interferometer displacement testing method with nanometer - sized capacity . at the same time , many wide - applied metering technology , for example , the diffracted field ( fringe ) measurement , co - focal lens system , optical fiber sensors and 4f ( focal distance ) space filter system which can embody the chief principle of fourier optics well , were combined into it successfully . this instrument can firstly offer and show modern optical testing method in the laboratory for majors of information processing , instrument science , measuring and testing technology and automatic technology 該多功能激光光電實驗系統以泰曼-格林干涉( twyman - green )光路作核心，包括先進的數字波面干涉技術和一種基于空間干涉原理的、納米分辨率零差干涉儀位移測量方法，同時將多種新穎、工程實用價值高的測量技術和光路如衍射測量、共焦顯微技術、光纖傳感技術以及反映傅立葉光學基本光學原理的4f空間濾波系統也組合進去。 |
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Query two : two public so - called and wild china south tiger photographs , fold to match together to analyze , discover different angle different focal distance takes not and meantime of “ living “ tiger , facial features , outline , striped pattern , height consistent 質疑二：兩張公開的所謂野生華南虎照片，疊合在一起分析,發現不同角度不同焦距不同時間拍攝的“活生生“的老虎,五官、輪廓、斑紋、高度一致 |
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Abstract : the rules of ganssian light beams extended by lens are disscussed firstey , and the relation between the optimum waist extended and focal distance of the lens are found out 文摘:首次討論了用透鏡來擴展高斯光束的一般規律，找出了最佳擴展束腰與透鏡焦距的關系 |
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Abstract : it is proved that a small circular aperture has the positive and minus focal distances , and the research experiments for small aperture glasses are introduced concisely 文摘:提出了證明小圓孔具有正、負焦距的一種方法，簡要地介紹了關于小孔眼鏡的實驗研究 |
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In this paper , the focal distance formula of lens in varied shapes is obtained by using object methods to make its physical meaning more obvious 摘要采用直觀的方法得出了空氣中各種形狀的薄透鏡的焦距公式，使其物理意義更加明顯。 |
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Correct under the guiding of route , we successfully design and have trial - produced the one kind of new long large - scale camera of focal distance 在正確路線的指引下，我們成功地設計和試制了一種新型長焦距大型照相機。 |