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INDEXING.md

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+# 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
+
+