Add the tablet photos of S04 and describe each session

README.md

@@ -33,18 +33,18 @@ protocol is built around label correctness.
 
 | | |
 |---|---|
-| Images | 531 |
-| Arrangements (distinct kernel layouts) | 117 |
+| Images | 588 |
+| Arrangements (distinct kernel layouts) | 119 |
 | Kernels per image | 170 – 800 |
 | Images with point annotations | 28 |
-| Splits | test: 74, train: 457 |
+| Splits | test: 131, train: 457 |
 
 | Session | Species | Lot | Light | Chaff | Cameras | Images | Arrangements | Kernels |
 |---|---|---|---|---|---|---|---|---|
 | S01 | rye-w | rye-w-A | desk | light | Galaxy S23, iPhone 8 | 108 | 27 | 274–787 |
 | S02 | oats-s | oats-s-A | desk | none | Galaxy S23, iPhone 8 | 124 | 31 | 240–798 |
 | S03 | barley-w | barley-w-A | desk | light | Galaxy S23, SM-P610, iPhone 8 | 225 | 28 | 225–733 |
-| S04 | wheat-w | wheat-w-A | desk | light | Pixel 9 | 74 | 31 | 170–800 |
+| S04 | wheat-w | wheat-w-A | desk | light | Galaxy Tab S6 Lite, Pixel 9 | 131 | 33 | 170–800 |
 
 ## Fields
 
@@ -117,6 +117,20 @@ the number on the current card, and the card and the layout are photographed aga
 Lighting (window light, desk lamp, cold and warm light, morning and evening), phones (see
 the table above) and backgrounds (table, mat, tray, floor).
 
+### Sessions
+
+- **S01:** winter rye (`rye-w-A`), light chaff, desk light; Galaxy S23 and iPhone 8;
+  2026-09-15/16.
+- **S02:** spring oats (`oats-s-A`), no chaff, desk light; Galaxy S23 and iPhone 8;
+  2026-10-02.
+- **S03:** winter barley (`barley-w-A`), light chaff, desk light; Galaxy S23 (shot as DNG),
+  iPhone 8 and Galaxy Tab S6 Lite (`SM-P610`); shot over three days, 2026-09-16 to 09-21.
+  The only weighed session.
+- **S04:** winter soft wheat (`wheat-w-A`), light chaff, desk light; Pixel 9 and Galaxy Tab
+  S6 Lite; 2026-10-15. Test data. The tablet missed or misdated the photos of cards 0, 3, 8,
+  14 and 15; its photos of those layouts were placed on the card by hand and checked
+  against the Pixel photos.
+
 ### Labelling
 
 A script decodes the card photos and assigns their total to the photos that follow them.
@@ -129,7 +143,7 @@ Card photos and scale photos are not included.
 
 ## Splitting
 
-Images are **not independent**: every arrangement appears in 1–22 photos (several phones,
+Images are **not independent**: every arrangement appears in 2–22 photos (several phones,
 several angles), and consecutive arrangements of a session share most of their kernels.
 Split by `lot`, or at least by `session`; never by image, and never by `arrangement_id`
 alone.