CVP BASIC VISION EXAM COMBINED
COMPLETE COURSE REVIEW GUIDE
◉ Rolling Shutter.
Answer: -exposes frame line after line
-number of exposures equals the number of lines in the frame
-better used on stationary targets/ not for use on moving targets
-less costly than global shutter
-can use stobe to stop motion
◉ Full Well Capacity.
Answer: -max. number of electrons that register a signal in a pixel
-larger pixels have higher well capacity which also leads to higher
sensitivity, better SNR, and increased dynamic range
◉ Dark Current Noise.
Answer: -rate of which electrons are produced due to thermal effects
-** every 8 degrees C = dark noise doubles **
-color camera = less dark noise
◉ Shot Noise/ Photon Noise.
,Answer: -due to random fluctuations in light
-Brighter/ Better light = less shot noise
◉ Characteristics of a telecentric lens:.
Answer: -designed to minized perspective error
-magnification can be maintained at differnent warning distances
-field of view is limited by the diameter of the front lens
-lenses can only meet their telecentric specifications over a specific
range of working distances
-because magnification is constant, different lenses are needed for
different fields of view
◉ Global Shutter.
Answer: -allows exposure of the whole frame at the same time
-use to stop motion - best for moving targets
-more costly than rolling shutter
◉ Correlation Pattern Matching.
Answer: -primarily relies on the grayscale info. in the image for
matching
-use when:
--template primarily characterized by grayscale info.
,--matching under uniform light changes
--little occulation and scale changes in an image
-**do not use when:**
--there is non-uniform lighting
--occlusion more than 10 percent
--scale changes
◉ Microlens.
Answer: -increase the photon collection area of the pixel and focus te
photons into the photo sensitive area. (Good "Fill Factor")
-all CCD designs use microlenses (color and monochrome)
-Pro: effectively increases quantum efficiency of the pixel
-Con: creates an angular sensitivity to the incident light ray.
◉ What if I have a CS-Mount camera and have a C-mount lens.
Answer: -add a 5mm adapter ring - adding 5mm = 17.526 mm
◉ What if I have a C-mount camera and have a CS-mount lens?.
Answer: -Your lens is not going to focus on the focal plane (image
sensor)
◉ Occlusion.
, Answer: -an area in an image you have no info on
◉ Is blob analysis usually a grey-scale algorithm?.
Answer: -no it is not
-blob analysis is a method of analyzing an image that has undergone
binarization
-image processing method for analyzing the shape features of an
object, such as the presence, number, area, position, length, and
direction of lumps
◉ MTF.
Answer: -Modulation Transfer Function
-the quantitative description of the image quality of a lens,
considering all aberations
◉ Photoelectric Effect.
Answer: -photons to electrons
-light photons hitting a silicon surface will dislodge electrons
-number of electrons released depends on intensity and wavelength
-takes place on each pixel to create an image
◉ Binning.
COMPLETE COURSE REVIEW GUIDE
◉ Rolling Shutter.
Answer: -exposes frame line after line
-number of exposures equals the number of lines in the frame
-better used on stationary targets/ not for use on moving targets
-less costly than global shutter
-can use stobe to stop motion
◉ Full Well Capacity.
Answer: -max. number of electrons that register a signal in a pixel
-larger pixels have higher well capacity which also leads to higher
sensitivity, better SNR, and increased dynamic range
◉ Dark Current Noise.
Answer: -rate of which electrons are produced due to thermal effects
-** every 8 degrees C = dark noise doubles **
-color camera = less dark noise
◉ Shot Noise/ Photon Noise.
,Answer: -due to random fluctuations in light
-Brighter/ Better light = less shot noise
◉ Characteristics of a telecentric lens:.
Answer: -designed to minized perspective error
-magnification can be maintained at differnent warning distances
-field of view is limited by the diameter of the front lens
-lenses can only meet their telecentric specifications over a specific
range of working distances
-because magnification is constant, different lenses are needed for
different fields of view
◉ Global Shutter.
Answer: -allows exposure of the whole frame at the same time
-use to stop motion - best for moving targets
-more costly than rolling shutter
◉ Correlation Pattern Matching.
Answer: -primarily relies on the grayscale info. in the image for
matching
-use when:
--template primarily characterized by grayscale info.
,--matching under uniform light changes
--little occulation and scale changes in an image
-**do not use when:**
--there is non-uniform lighting
--occlusion more than 10 percent
--scale changes
◉ Microlens.
Answer: -increase the photon collection area of the pixel and focus te
photons into the photo sensitive area. (Good "Fill Factor")
-all CCD designs use microlenses (color and monochrome)
-Pro: effectively increases quantum efficiency of the pixel
-Con: creates an angular sensitivity to the incident light ray.
◉ What if I have a CS-Mount camera and have a C-mount lens.
Answer: -add a 5mm adapter ring - adding 5mm = 17.526 mm
◉ What if I have a C-mount camera and have a CS-mount lens?.
Answer: -Your lens is not going to focus on the focal plane (image
sensor)
◉ Occlusion.
, Answer: -an area in an image you have no info on
◉ Is blob analysis usually a grey-scale algorithm?.
Answer: -no it is not
-blob analysis is a method of analyzing an image that has undergone
binarization
-image processing method for analyzing the shape features of an
object, such as the presence, number, area, position, length, and
direction of lumps
◉ MTF.
Answer: -Modulation Transfer Function
-the quantitative description of the image quality of a lens,
considering all aberations
◉ Photoelectric Effect.
Answer: -photons to electrons
-light photons hitting a silicon surface will dislodge electrons
-number of electrons released depends on intensity and wavelength
-takes place on each pixel to create an image
◉ Binning.
