digital time subtraction 中文意思是什麼
digital time subtraction
解釋
數字時間減影法- digital : adj. 1. 手指的；指狀的。2. 數字的，數據的。n. 1. （鋼琴等的）琴鍵。2. 手指。
- time : n 1 時，時間，時日，歲月。2 時候，時刻；期間；時節，季節；〈常pl 〉時期，年代，時代； 〈the time ...
- subtraction : n. 減去，扣除 （from）; 【數學】減法。
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In accordance with the above case, real - time background compensation against ir image for eliminating influence of thermal blooming can be carried out by using digital image processing methods such as frame subtraction and reversed color addition
針對上述情況，研究用數字圖像處理的方法幀相減、反色相加，對紅外圖像進行實時背景補償，以便消除熱暈的影響。 -
The author has a theory analysis on registration and its limitations, and then provides two schemes, one is manual registration and the other is automatic registration. in the automatic registration, the template registration is selected to deliver the automatic global registration. and the similarity measurement is based on the histogram " entropy of differences - based measures which makes the registration to be robust and efficient for real - time digital subtraction
所以此時需要對剪影圖象中的造影片和蒙片進行配準，本文首先進行了配準的理論分析並且提出配準的局限性，進而實現了兩類配準，一類為人工配準，另一類為自動配準，在自動配準中主要採用了模板匹配法進行整體配準。 -
From theoretical analysis, we know the existing demodulation methods have limitations as following : one is that the subtraction of the two signals frequencies will display as the result of demodulation when we demodulate two time - domain adding signals without modulating information ( fault information ) ; the other one is that aliasing phenomenon will occur as a result of getting absolute value, detection or square in the process of generalized demodulation analysis, such phenomenon will result in some superfluous frequency composition on the frequency spectrum, which will puzzle the detec tion of mechanical vibration. if the sampling frequency is selected from a suitable range, the aliasing phenomenon will be avoided ; the last one is that aliasing frequencies will be produced in zoom demodulation analysis because this algorithm cannot employ digital low - pass filtering to avert the folding frequencies of higher harmonics in the process of zoom sub - sampling
現有的解調分析方法存在以下三種局限性：將不包括調制信息（故障信息）的兩時域相加信號，也以其頻率之差作為解調信號而解出；廣義檢波濾波解調分析中，由於取絕對值、檢波或平方過程可能產生混頻效應，在解調譜中表現為無法分析的頻率成分，並由此推導出避免這種混頻現象的采樣頻率的選取范圍，從根本上避免此類誤診斷的產生；幾種細化解調分析新演算法中，因為無法在細化分析的選抽時進行數字低通濾波，有可能會出現調制頻率的高次諧波成分發生頻率混疊而反折到低頻部分的現象。
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