yolo format documentation update (#295)

* add info about coordinates in yolo format doc
openvinotoolkit · Jun 11, 2021 · b86a6eb · b86a6eb
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -11,6 +11,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Support for import/export zip archives with images (<https://github.com/openvinotoolkit/datumaro/pull/273>)
 - Subformat importers for VOC and COCO (<https://github.com/openvinotoolkit/datumaro/pull/281>)
 - Support for KITTI dataset segmentation and detection format (<https://github.com/openvinotoolkit/datumaro/pull/282>)
+- Updated YOLO format user manual (<https://github.com/openvinotoolkit/datumaro/pull/295>)
 
 ### Changed
 -

diff --git a/docs/formats/yolo_user_manual.md b/docs/formats/yolo_user_manual.md
@@ -97,11 +97,12 @@ should contain information about labeled bounding boxes
 for images:
 ```
 # image1.txt:
-# <label_index> <x> <y> <width> <height>
+# <label_index> <x_center> <y_center> <width> <height>
 0 0.250000 0.400000 0.300000 0.400000
 3 0.600000 0.400000 0.400000 0.266667
 ```
-Here `x`, `y`, `width`, and `height` are relative to the image's width and height.
+Here `x_center`, `y_center`, `width`, and `height` are relative to the image's width and height.
+The `x_center` and `y_center` are center of rectangle (are not top-left corner).
 
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