Detect local orientation using connected pixels

kolhizin / bujo

Proof of concepts and sharedlib for bujo app

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Detect local orientation using connected pixels #17

Closed kolhizin closed 5 years ago

kolhizin commented 5 years ago

Use local approach, but combine loss function with orientation, so that loss-function penalizes if line starts to go diagonal to text direction.

Either of two options:

find "local" orientation of text
check proposed lines against text in that bounding box & calculate "dot-product"

DoD:

set of lines, represented by support points

kolhizin commented 5 years ago

Read http://www3.ntu.edu.sg/home/EXDJiang/JiangX.D.-PR-07-1P.pdf

kolhizin commented 5 years ago

Tested selection of connected "points" and determination of local orientation by

projection with maximal length -- unstable under outliers
projection with least std dev

Method is not stable when lines blend, hence produces incorrect angle. Idea 2 migrated into manual-coded radon transform. It is on the edge of performance.