Interference No. 103,587
He showed his father how he scanned two rows and used prior outputs with hysteresis to form
adjacent groups of dots. The idea for Dot 2 was implemented through experiments. He planned
a series of experiments in which he produced test patterns of dots. Then he performed many dot
pattern tests to determine the effect of changing the value of the constant which controls the
amount of hysteresis. The dot pattern tests were grey scale tests using a grey wedge that goes
from zero to 100% along a grey scale.
Subsequent to November 8, 1997 and the dot pattern tests, Raphael printed screened
images using Dot 2 throughout the whole month. He showed his father numerous test printouts.
Raphael recently found a computer file written in BASIC called WAVY.BAS on the hard drive
of his computer that he wrote when he first implemented an early version of Dot 2. Raphael
showed his father a BASIC program printed from the WAVY.BAS computer program file, dated
November 12, 1987. LX-8 is a photocopy of the label and markings on the hard disc drive which
contains the WAVY.BAS computer program file. Raphael showed his father early printouts of
Dot 2 screens which he called a wavy line screen or zebra line screen. The wavy lines were
replaced with more traditional rounded dot shapes when Raphael substituted a serpentine scan
for raster scan sometime between November 12 and 30, 1987. Because of his practice of
screening images as soon as he wrote a program, he would have reduced his Dot 2 invention to
practice as of November 12, 1987.
Jack Levien saved a printout screened with Dot 2 that was taken at his son Alex’s
sixteenth birthday celebration on November 30, 1987. Raphael took the picture using his digital
camera. The camera was connected to a power supply and interfaced with his computer.
Raphael immediately screened and printed out this picture using Dot 2. LX-9 is the image he
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