东北农业大学：《病虫害诊断》课程教学资源（PPT课件讲稿）葫芦科蔬菜病害（制作人：张艳菊）

一、主链 二、支链 三、端基 四、侧基

东北农业大学：《病虫害诊断》课程教学资源（PPT课件讲稿）十字花科蔬菜病害症状及病原物形态观察

The output y[n] of a frequency-selective LTI discrete-time system with a frequency response exhibits some delay relative to the input x[n] caused by the nonzero phase response of the system

Example - Determine the DTFT of Let We can therefore write From Table 3.1, the DTFT of x[n] is given by

Transform-Domain Representation of Discrete-Time Signals Three useful representations of discrete-time sequences in the transform domain: Discrete-time Fourier Transform (DTFT) Discrete Fourier Transform (DFT) z-Transform

BIBO Stability Condition - A discrete-time LTI system is BIBO stable if the output sequence {y[n]} remains bounded for any bounded input sequence{x[n]}

Sound knowledge of linear algebra and calculus Signals and systems (ECE 351 and ECE 352 or equivalent courses) Basic Matlab programming skillsRequirements

*对比度增强 *图象平滑 *图象锐化 *同态滤波 *伪彩色与假彩色处理 *代数运算 *几何运算

一、频率响应 二、传输函数 三、简单滤波器 四、一些特殊的传输函数