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recomendaciones antes de abrir guitar proTRANSCRIPT
MUSIC HACK DAY, Vienna 2013
AudiverisOptical Music Recognition
Presented by Hervé [email protected] February 2, 2013
V1
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Agenda
● User demo● The big picture● Audiveris technology● Current 4.2 release● Integration● Future
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User Demo
● User oriented Input Corrections Outputs
● Case Input : Dichterliebe01.pdf Language : DEU Tempo : 80 Output : Finale Notepad
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Score Transcription « big picture »
SymbolicNotation
PrintedScores
OMR
MusicInfo
Retrieval
IndexSearch
Edition
ScoresImages
EditViewPlay
Transpose
Pivot Format
Optical Music Recognition
AudiverisAudiveris
MuseScore
PeachNote
Scan
MusicXML
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Music notation
● MusicXML Symbol level Meant for score interchange
● MIDI Note level Meant for digital instruments
● MP3 Sound level Meant for recorded music
High level
Low level
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OCR vs OMR
OCR(text)
OMR(music)
Complexity Horizontal lines of characters
Combined horizontal & vertical directions
Technology Rather mature Several yearsbehind OCR
Products Many Just a few. One FOSS: Audiveris
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Basic definitions: Runs & Sections
Black run of 3 pixels
White run of 18 pixels
Section of 6 adjacent runs
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Tech Demo
● Technology oriented Runs Grid
● Case Input : Chula.png Language : FRA Params : showRuns, showCombs Output : MuseScore
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Pixels: Staff Lines & other objects
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Black runs histo. → line thickness
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White runs histogram → interline
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Vertical runs > line thickness
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Vertical runs <= line thickness
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Short horizontal runs put aside
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Long hori. runs → lines skeleton
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Clusters of equidistant lines
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Staff lines detected
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Staff lines removed
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Wavy staff lines: Splines
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Wavy staff lines: Dewarped image
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Stems detected
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Sections → Glyphs → Shapes
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Generated score
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Audiveris version 4.2● Released in December 2012● Features:
Ghostscript integration– for PDF input
Adaptive Binarization– for non-uniform images
Tesseract OCR V3– for text handling
ART-based moments– for shape recognition
Plugins– for MusicXML consumers
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Local OMR Integration
MusicXML
scan
Audiverisplugin
plugin
MuseScore
display
client
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OMR as a Service (hack of the day)
MusicXML
scan
MuseScore
display
internet
Audiveris
FrontEnd
client server
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Audiveris evolution
● Technology Good building blocks available 4.2+: iterative approach OK for good-quality scans 5.x: fuzzy logic needed for poor-quality scans
● Architecture Focus on OMR service
● « Freemium » model Free for basic features or low volume Premium for more serious usage
