background contrast ratio 中文意思是什麼

background contrast ratio 解釋
背景反差比
  • background : n 1 後景，背景；基本情況；（紡織品等的）底子；出身；經歷。2 隱蔽的[不引人注目的]地位；幕後。3 襯...
  • contrast : n 1 對照，對比；（對照中的）差異。2 對立面，對照物；【攝影】反差。3 【修辭學】對照法。vt 使對照，...
  • ratio : n. （pl. ratios）1. 比，比率，比值；比例；系數。2. 【經濟學】復本位制中金銀的法定比價。vt. 1. 用比例方式表達；求出…的比值；使…成比例。2. 將（相片）按比例放大或縮小。
  1. At present, the practical problem that the target place faces is that the target is too small, the distance is far, the contrast ratio between the target and background is small. in order to improving the recognition capability of the equipment to the low contrast ratio target, fast and effective pattern recognition becomes one of key technology which influences systematic function

    目前靶場所面臨的實際問題是測量目標小，距離遠，目標與背景對比度小，為了提高靶場光測設備對低對比度目標的識別能力，快速、有效的圖像識別處理成為影響系統性能的關鍵技術之一。
  2. Two wedge interferometers are designed that the thickness of one is higher than the other. so when the incident coherent light through the interferometers can acquire two fringe patterns which having space shift, but the incident incoherent light only result in consistent intensity signal. through a differentiating amplifier, two signals subtract which can eliminate noise of background and result in higher contrast ratio fringe signals. this method largely improves the system and the ability of detection. the spacing of line fringes is a function of incident laser wavelength, by analyzing, we can extract the wavelength of incident laser. the optical unit analyzing and results also simulated with matlab

    當背景光入射時，直接穿過干涉儀，僅發生強度的衰減，在兩個探測平面上產生幅度基本一致的灰度信號，通過差分放大器，相消為零，從而抑制了背景干擾。當激光信號入射，穿過干涉儀時受到調制，在探測平面上產生干涉條紋。通過所設計的存在平均厚度差的雙楔形干涉儀，兩路干涉條紋圖案出現相對移位：在兩個探測平面對應的位置上，一路出現亮紋，另一路出現暗紋。
  3. At first, carrying on varying the gray level of the picture which is gathered by ccd system in order to strengthening the contrast ratio between the target and background ; and smoothing the picture in order to getting rid of the noise which is produced by gathering and transmitting, so that we can detect the edge easily

    文中首先對ccd系統採集進來的圖像，進行灰度變換，增強靶標與背景的對比度；並對圖像進行平滑處理，去除圖像採集和傳輸中混入的噪聲，以利於圖像的邊緣檢測。
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