Moire patterns in an image probably arise from _______________.undersampling B.oversampling C.spatial filtering D.temporal filtering 12.

11.Moire patterns in an image probably arise from _______________.

A.undersampling

B.oversampling

C.spatial filtering

D.temporal filtering

12.Spatial filtering is a process for _____________ a digital image before size reduction by reducing the number of pixels.

A. anti-alias filtering

B pixel reduction filtering

C pixel averaging filtering

D pixel smoothing filtering

13.High-contrast gray scale for sonograms use ______ bits per pixel to quantize the image. 

A16

B24

C4

D8

14.In a charged couple photodetector incident photons incident generate hole-electron pairs proportional to the light intensity. A positive voltage _____________________.

1.attracts electrons to keep them in a potential “well”

2.moves electrons to the next well.

3.attracts holes to keep them in a potential “well”

4.none of these possible answers apply.

15.The difference between a CCD photodetector array and a CMOS photodetector array is _________________________.

A .each photodiode in a CMOS array has an amplifier that converts the charge to a voltage which is transmitted to an ADC.

B.each photodetector in a CCD device has separate RGB filters.

C.each photodiode in a CMOS array transfers its photo-generated charge to an ADC converter.

D.each photodiode in a CCD array has an amplifier that converts the charge to a voltage.

16.For identical pixel counts, large sensor arrays in digital cameras: 

A. have greater sensitivity for light and less sensitivity to noise.

B. have less sensitivity for light and less sensitivity to noise.

C. have greater sensitivity for light and greater sensitivity to noise.

D. have less sensitivity for light and greater sensitivity to noise.

17.In JPEG compression, the amplitudes of the two-dimensional Fourier frequencies are quantized with _____ bits for high frequencies and ____ bits for low frequencies.

A 4, 8

B 8, 4

C 16, 8

D 4, 16

18.MPEG compression only stores changes in subsequent frames to remove _______________ and uses ______ to reduce irrelevant data in the image. 

A. redundancy, JPEG

B. extra pixels, JPEG

C. alternate pixels, JPEG

D. noise, JPEG

19.To avoid artifacts in a digital image, the pixel spacing must be less than one half the smallest spacial wavelength in the original continuous image. This is predicted by the ___________.

A. Fourier theorem

B. Oersted’s Law

C. Conservation of energy

D. Nyquist theorem

20.A spatial filter is applied to a digitized image in order to _________________________

A. average the intensities of a square array of pixels to reduce rapid changes in intensity.

B.average the intensities of a square array of pixels to increase the number of pixels per inch.

C.to reduce the number of pixels.

D. average the intensities of a square array of pixels to reduce slow changes in intensity.

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