h-d curve 中文意思是什麼
h-d curve
解釋
曝光特性曲線:乳膠的照射量-光密度曲線-
Firstly, fourier descriptor used to describe the object ' s shape is introduced to the extraction of feature of apple ' s shape. the boundary of apple is an obturated curve, distance between boundary point and centroid r ( k ) " is used as a function to express the 2 - d boundary in spatial domain. the fourier transform coefficients of the discrete sequences f ( h ) are spectrum values in frequency domain, and they compose feature parameters of shape
首次將圖像分析理論中對形狀的傅立葉描述方法引入到對蘋果形狀的特徵提取中,果實邊界是一條封閉曲線,用邊界點到形心之間的距離長度r ( l )作為空域中對二維曲線的表達函數,離散的函數值序列r ( k ) ~ l的離散傅立葉變換系數f ( h )就是頻域中得到的頻譜值,可作為形狀的特徵參數。
分享友人