In the context of digital image processing , description（）
A. is also referred to as representation
B. is also called feature extraction
C. involves extracting attributes that result in some quantitative information of interest
D. is the process of recognize Individual objects
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The application areas of DSP include the following but（）
A. earthquake recording & analysis
B. cognitive science
C. echo reduction
D. simulation and modeling
showed experimentally the possibility of electromagnetic wave propagation in waveguide（）
A. Heinrich Hertz
B. George Southworth and W.L.Barron
C. Oliver Heaviside
D. Lord Rayleigh
A continuous signal is also called because its waveform is often analogous to that of the physical variable（）
A. an analog signal
B. a discrete signal
C. a digital signal
D. a sampled signal
Which of the following statements best describes the property of the system T if y1（t）=T[x1（t）], y2（t）= T[x2（t）] implies T[ax1（t-s）+bx2（t-s）]= ay1（t-s）+by2（t-s）（）
A. the system is linear
B. it is a linear time-invariant system
C. the system satisfies the principle of superposition
D. the system satisfies additivity and time-invariance
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