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Terms in this set (20)
What is a bit?
smallest binary unit
What is a byte?
8 bits, number of bits required to encode a single character
What comes next? bit, byte, MB, GB...
Terabyte, petabyte, exabyte
Is analogue continuous or discrete?
continuous
Is digital continuous or discrete?
discrete
how many steps in an 8 bit image?
256
what is the equation to find file size?
matrix size x bit depth
What are the three steps in digitization?
scanning, sampling, quantisation
what does scanning do?
divides the image into a matrix of small cells
What will occur if the pixels are too big?
poor resolution, pixelated image
What will occur if the pixels are too small?
wasted resources
At the end of the scanning stage what is the image in terms of space and value?
discrete in space and continuous in value
What occurs during sampling?
the intensity of each pixel area is measured
On a dexel, where is energy stored? Where is it not?
energy is stored on the del detector surface. It is not stored on the TFT od storage capacitor
Describe the detector read out process
- gate lines from the address driver control the sequence at which the dels dump their charge into data lines.
- gate lines apply charge to TFT, allowing the charge to flow down the data lines
- the sotred charge is read one del at a time, column by column, row by row
- row 1 selected, signal is supplied and closes the transitors switches
- column 1 selected, multiplexer closes switch to s1. charge from the del moves into data lines and into the amplifier and adc and computer.
- multiplexer closes s1 and opens s2 to select del 2
what is sampling pitch?
distance between each point of sampled information
what is nyquist frequency?
every signal must be sampled twice per brightness change
What occurs during quantisation?
a vaule is assigned to each pixel representing a grey value
After quantisation, what is the image in terms of space and value?
discrete in space and discrete in value
What happens to the original data before digitisation?
it is lost
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