Because of the objective factors , such as the detector noise and misalignments , it is very important to make a detailed study of the attacking methods for the sake of practicality 由于客觀因素的影響,比如探測器的噪聲、失調(diào)等,為了確保量子密鑰分配方案的實用性,研究竊聽者采取的竊聽方式是十分重要的。
The article analyzes background noise , amplifier noise and detector noise in detail from fixed character of infrared dim - small target image , also processes the infrared image and separates targets from the image 文章主要對紅外弱小目標(biāo)圖像中的背景輻射噪聲、放大器噪聲、探測器噪聲進行了詳細的定性分析,并對紅外圖像進行處理,從圖像中分離出了弱小目標(biāo)。
For example , the geometric effect and vignetting are simulated with the synthetic method in which they are modeled with ray tracing and then simulated with pixel - based processing . the effects of detector noise on imaging are simulated with the three - dimension model . the theory of pixel transfer function is extended and developed , and microscanned images of four patterns are simulated with good results 本文具有如下幾個突出特點:用光線追跡法分析建模,而用基于象素處理的綜合方法,模擬了光學(xué)系統(tǒng)中的幾何效應(yīng)和漸暈現(xiàn)象;利用三維噪聲模型,模擬了探測器噪聲對圖像質(zhì)量的影響;對象素傳遞函數(shù)理論進行了擴展和延伸,給出四種工作模式的微掃描成像系統(tǒng)的象素傳遞函數(shù)的具體數(shù)學(xué)表達式,并利用這些表達式模擬了探測器的空間效應(yīng)和微掃描成像的圖像效果。