Auto mashup

1. read tags
2. detect passages
3. bpm detection
4. audio mixing
5. auto level adjust
6. auto groove generation

case

1. percussion: generate drum N'bass sequence
2. groove instruments: find 1 or 2+ bpm-matches in 1 or 2+ non-Electronica recordings, e.g., guitar solo or riff, cut them off properly to form a loop, possibly using Metadata tags for searching.
3. repeat #2 to lots of other recordings, e.g., ambient recordings, find spectral balance between selected tracks.
4. level adjust to avoid clipping and imbalanced EQ.
5. mix down

max angular sampling (write-up outline)

our scan line (radius) may fall between pixels, then in the sense of NN,

1. starting with a reference point A
2. evenly sample
3. can't predict the shape of the edge, so consider the worst case: the next edge point can be within one of the 8-neighbors.
4. which one of the 8-nb, determined by the orientation of the radius, position of the anchor point.