avdb-py/INDEXING.md

INDEXING

Overview

Each image is processed into multiple down-sampled images (powers of 2).

Each level is analyzed as

• tile-sets (lower resolution stages)
• gridded histograms (higher resolution stages) or
• or not at all (highest resolution stages/too much detail)*

- orig
- detail/no analysis
- detail/no analysis
- gridded histogram
- gridded histogram
- gridded histogram
- tile-set
- tile-set
- tile-set

• gridded-histogram X 81
  • 9 X 9 X 48 bin Lab histogram
• gridded-histogram X 25
  • 5 X 5 X 48 bin Lab histogram
• gridded-histogram X 9
  • 3 X 3 X 48 bin Lab histogram
• tile-set X 9
  • ~300 X 9
• tile-set X 5
  • 80 X 5
• tile-set X 1
  • 20 X 1

COL LABELS

Mapping tiles to analysis data:

• tile_id
• img_id
• level (resolution)
• tilex
  • logical tile x
• tiley
  • logical tile y
• x
  • upper left @ histogram levels (in original resolution)
  • center @ tile-set levels
• y
  • ...
• x0
  • upper left @ histogram levels (in down-sampled resolution)
  • center @ tile-set levels
• y0
  • ...
• w
  • width of histogram region
  • or width/size of tile-set
• h
  • height of histogram region
  • or width/size of tile-set (redundant with w - option 2)
• foreign key to histograms table
• foreign key to tile-sets table

Reverse mapping: analysis data to tiles:

• foreign key to histograms table
• tile id

OR

• foreign key to tile-data table
• tile-id

ORIGINAL_RESOLUTION <-> DOWN_SAMPLED_RESOLUTION

• point
• rectangle
• area