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http://vectormaoic.com/home (cannot save)
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Vector Image
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Vector images also called or oåject-oriented images
€ Images are repræentedby q.collectíon of poinß, lines and other
geometic obiecß
€ Instead of storing tlte pixel color values, a vector graphic file
contains the instructions forthe computer to create the shape, size,
position, and color for each obiect in an image
"B Compared to bitrnap images
ÉVector images resize better; the objecs change proportionally
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It is easier to edit an obiect in
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as realistic as
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Tracing sofrware isneeded to
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DigitalVideo
 Avideoisjustasequenceofimages(frames)showingoneafter
anotherveryquickly
 Twomostcommonvideosignalstandards
 PAL(PhraseAlternatingLine)
25framespersecond(fps)
Frameresolution:VCD(352x288),DVD(704x576)pixels
 NTSC(NationalTelevisionSystemCommittee)
30framespersecond(fps)
Frameresolution:VCD(352x240),DVD(704x480)pixels
 ForVCD/DVDvideo,colordepthtypicallyis24bits
 HDTVprovidesevenhigherresolution:
720p:(1280x720)
1080p:(1920x1080)(so‐called“FullHigh‐Definition”)
Ultra‐HDTV:(7680x4320)(currentlyadoptedbyJapanNHKas8KUHDTV)
JeanWang/CS1102‐ Lec07
23
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For you to explore after class
what is the compression ratio when compressing a stereo 2
into the MP3 format with 128 kbit/s bit rate? (assumÏñf
1k=1
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similar to audio, uncompressed video
amount of storage space. For a 30 seconds clip
with stereo sound in a sample rate of 48 kHz, how many bytes are
needed? (assu
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9.8 Mb
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clip in
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Jean Wang
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