forward velocity tracing 中文意思是什麼
forward velocity tracing
解釋
前向流速曲線-
The authors established an initial velocity model based on the first break time of the actual data, then realized the forward calculation with the improved shortest path ray tracing algorithm, and applied the improved constrained damped simultaneous iterative reconstruction technique ( cdsirt ) to solve large - scale and sparse equations for inversing the near - surface velocity field
根據實際地震數據的初至波時間建立初始速度模型；採用改進的最短路徑射線追蹤演算法進行正演；利用改進的約束帶阻尼聯合迭代重建技術（ cdsirt ）求解大型、稀疏的方程組來反演近地表的速度場。 -
The method is better than others. firstly, the system sets up several models to assist detection work, such as road model, illumination model, shadow model and relationship model among them ; secondly, it introduces hue. saturation degree information to distinguish vehicles from shadow ; thirdly, it makes use of binary decision tree to analyze pressing line of vehicles to improve the reliability of the system ; fourthly, it puts forward a way of one dimension video tracing to resolve the problem of vehicle velocity detection
該方法通過設置在每條車道中的兩條相互垂直的虛擬檢測線來檢測交通流信息（如車流量、車速等） ；設計一種彩色分段檢測技術來提取運動車輛的尺寸信息和色彩信息，再利用分類決策樹和濾波演算法確定運動車輛存在與否，增強了車輛、陰影、噪聲和背景之間的區分能力；設計了一種車速視頻檢測方法。 -
2 ) forward modeling method of refraction first - break in lateral varying velocity media. for layered media, a new forward modeling method of refraction is presented. for more complex near - surface conditions such as mountain areas, a new improved ray tracing method based on shortest path assumption is studied, it has higher accuracy and faster computing efficiency than conventional ones. the method can be used for the forward modeling of complex near - surface media
而對于折射面起伏較大、低速層和折射層速度變化較大的復雜近地表情況，提出了一種改進的最短路徑初至波射線追蹤方法，該方法精度高，計算速度快，適用於任意二維復雜近地表介質（如山地）的初至折射波的正演計算。
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