directional filtering 中文意思是什麼
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In this dissertation, a combinatorial algorithm based on the directional segmentation is proposed for the preprocessing of the fingerprint images, this combinatorial algorithm is composed of normalization, directional image computation, directional filtering ( gabor filtering ), local self - adaptive binarization, noise elimination and thinning
本文的預處理演算法包括以下步驟:規一化、方向圖計算、方向濾波（採用gabor濾波） 、局部自適應二值化、二值化去噪和細化。 -
The paper includes four sections followed here : the first section studies the modeling of signals of pulse doppler radar seeker, and establishes a radar signal simulation model, including radar emitting signal model, receiving signal model, receiving echo signal model, clutter model, noise model, sum channel directional pattern of antenna model, difference channel directional pattern of antenna model, sheltering model, rcs model, glint noise model, etc. the second section studies signal processing of pulse doppler radar seeker, and establishes radar signal processing mathematical model and data processing mathematical model for simulation, including windowing, doppler filtering, envelope demodulation, pdi, cfar, centering, velocity tracking, angle tracking, a - b filtering, etc. the third section studies the modeling of modified proportion guiding, and establishes guiding model, then dynamic simulation results is provided
論文的主要工作包括四部分：第一部分研究了脈沖多普勒雷達導引頭的信號建模問題，建立了雷達信號模型，主要包括：發射信號模型、接收信號模型、目標回波信號模型、雜波模型、噪聲模型、和差通道天線方向圖模型、遮擋因子模型、接收機噪聲模型、目標雷達截面積統計性模型、目標角閃爍模型等。第二部分研究了脈沖多普勒雷達導引頭的信號處理模式，建立了信號和數據處理模型，主要包括：加窗和多普勒濾波、包絡檢波、檢波后積累、頻域cfar處理、速度定心、速度跟蹤、角跟蹤、 ?濾波等，然後給出了信號處理流程。 -
Moreover, a spindly shaped damping zone is designed to improve the absorption capability of conditional damping zone, which has the function of two directional wave absorption and low - pass filtering
其中對阻尼消波技術作了改進，設計了一種紡錘形的阻尼消波器使其具有雙向消波功能和低通濾波功能。 -
In gabor filter, we use eight directional filtering to process fingerprint image to compare wiener filtering, we get good process result
在預處理中，採用八個方向的gabor濾波對指紋圖像進行濾波，把它與維納濾波作比較，得了較好的試驗結果。
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