# 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