geometrical focus 中文意思是什麼
geometrical focus
解釋
幾何焦點- geometrical : adj. 1. 幾何學的，幾何圖形的。2. 按幾何級數增長的。adv. -rically
- focus : n （pl focuses foci ）1 【物理學】焦點。2 【物理學】焦距；聚焦，對焦點，配光，對光。3 （活動興趣...
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First, resistance to geometrical distortion was obtained by using moment normalization ; second, we focus on the phase of fourier - mellin transform. before detecting watermark, synchronization could be retrieved by using the phase information. to eliminate the influence of pixel value distortion generated during print / scan process, a dft - based robust watermark algorithm was designed, which could successfully detect watermark from a severe distorted image
另一種思路是根據圖像經過旋轉、縮放、平移后，其傅立葉?梅林變換域只有相位受到影響的特點，從其相位中提取幾何失真信息，然後再進行相應的失真補償，從而消除幾何失真的影響；對于列印掃描過程產生的像素值失真，本文也提出了一種基於dft的魯棒性演算法，能在較嚴重的圖像失真情況下，成功檢測水印。 -
2. not only made a details description of distort - image recovery methods including out - of - focus, motion - image and geometrical - transformation, but also realize the recovery function under the environment of visual c + + and matalb. this application is also an innovation in the image processing technology
由於失真的原因多種多樣，本論文將詳細地介紹離焦、運動這兩種主要失真圖像的復原方法，並且將利用vc + +語言和matlab語言結合起來實現這一功能。 -
According to geometrical focusing theory, the gamma knife can focus in spirals 30 beams of co - 60 gamma rays through a collimator to form a high - quality high - dose radiation field. the size of radiation filed can be varied and shaped according to tumor size for 3d radiotherapy. therefore, it can effectively increase radiation dose to tumor tissues and decease radiation dose to normal tissues
根據幾何聚焦原理，將30束鈷60伽瑪射線通過準直后經一個固定的軸線旋轉聚焦，形成品質優良的高劑量區分佈，經治療計劃系統的優化，可使高劑量區的劑量分佈，在三維方向上和腫瘤的形狀一致，從而實現三維適形放射治療。
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