数字图像处理课件(冈萨雷斯第三版)复习材料..docVIP

(1) 名词解释 RGB Red Green Blue，红绿蓝三原色 CMYK Cyan Magenta yellow blacK , 用于印刷的四分色 HIS Horizontal Situation Indicator 水平位置指示器 FFT Fast Fourier Transform Algorithm (method) 快速傅氏变换算法 CWT continuous wavelet transform 连续小波变换 DCT Discrete Cosine Transform 离散余弦变换DiscreteWaveletTransform 离散小波变换? Gray Level Histogram 灰度直方图基函数基图像多尺度分析高斯函数锐化滤波器平滑滤波器/卷积图像增强和图像恢复 （2）问答题 1. Cite one example of digital image processing Answer: In the domain of medical image processing we may need to inspect a certain class of images generated by an electron microscope to eliminate bright, isolated dots that are no interest. 2.Cite one example of frequency domain operation from the following processing result, make a general comment about ideal highpass filter (figure B) and Gaussian highpass filter(figure D) Original image ideal highpass filter In contrast to the ideal low pass filter, it is to let all the signals above the cutoff frequency fc without loss, and to make all the signals below the cutoff frequency of FC without loss of. the result of ideal highpass filter Gaussian highpass filter High pass filter, also known as low resistance filter, it is an inhibitory spectrum of the low frequency signal and retain high frequency signal model (or device). High pass filter can make the high frequency components, while the high-frequency part of the frequency in the image of the sharp change in the gray area, which is often the edge of the object. So high pass filter can make the image get sharpening processing The result of Gaussian filter 3.The original image, the ideal lowpass filter and Gaussian lowpass filter are shown below B nd C .D and E are the result of the either filter B or C Draw lines to connect the filter with their result Explain the difference of the two filters Due to excessive characteristics of the ideal low-pass filter too fast Jun, it will produce a ringing phenomenon.Over characteristics of Gauss filter is very flat, so it is not ringing 4.What is the result when a