利用數位影像處理技術分析雲速

Application of Digital Image Processing Technique to Cloud Tracking

蘇良石(Liang-Shur Su)

《大氣科學》 12卷1期 (1985/03) Pp. 51-61

摘要

本研究旨在嘗試運用一套數位影像處理系統裝置，將衛星雲圖微縮片經掃描攝像、數位化等轉換過程從中獲取數位化雲圖資料，供作雲塊追蹤分析之用。關於圖片定位、資料修勻、亮度歸一，等資料整理步驟以及如何自微電腦記憶區抽取特定範圍之數位資訊，並配合軟體程式進行分族、適配、和計算雲端諸項工作均予詳盡之探討。由預先設定的參數，可藉電視監視幕以觀察各種分族情形。最後，將分析結果與日本衛星氣象中心發佈之衛星風場資料比對，大致相符。將來若能配合即時資料，把分析結果應用在數值預報模式中，相信對其預報結果，當能有所助益。

並列摘要

In this paper, the emphasis is on the design and setting of a digital image processing system for automatically tracking clouds. A description is given of the component parts that perform the following functions: digitize the sequence of pictures obtained from GMS-1 microfilm; geographic registration; smoothing technique; brightness normalization; subdivision of the cloud data into groups; matching groups at two different time stages; and computation of cloud motion vectors.Selection of different values of the preset parameters would lead to different sets of grouping results; and get a capability of display the cloud patterns on a T. V. monitor.From the results, the computed cloud motion were resonable and agreed qualitatively with motions reported by J. M. S. C. Fruther study is required to process the digitized cloud patterns in real time and Wild appropriate processing, the results of wind vectors may be proved to b e very valuable as input to numerical forcasting models.