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authorThéo de la Hogue2023-09-06 10:01:12 +0200
committerThéo de la Hogue2023-09-06 10:01:12 +0200
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Renaming aruco markers pipeline chapter. Working on aruco camera configuratin chapter.
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-Build ArUco markers scene
-=========================
-
-First of all, ArUco markers needs to be printed and placed into the scene.
-
-## Print ArUco markers from a ArUco dictionary
-
-ArUco markers always belongs to a set of markers called ArUco markers dictionary.
-
-![ArUco dictionaries](../../img/aruco_dictionaries.png)
-
-Many ArUco dictionaries exist with properties concerning the format, the number of markers or the difference between each markers to avoid error in tracking.
-
-Here is the documention [about ArUco markers dictionaries](https://docs.opencv.org/3.4/d9/d6a/group__aruco.html#gac84398a9ed9dd01306592dd616c2c975).
-
-The creation of [ArUcoMarkers](../../argaze.md/#argaze.ArUcoMarkers.ArUcoMarker) pictures from a dictionary is illustrated in the code below:
-
-``` python
-from argaze.ArUcoMarkers import ArUcoMarkersDictionary
-
-# Create a dictionary of specific April tags
-aruco_dictionary = ArUcoMarkersDictionary.ArUcoMarkersDictionary('DICT_APRILTAG_16h5')
-
-# Export marker n°5 as 3.5 cm picture with 300 dpi resolution
-aruco_dictionary.create_marker(5, 3.5).save('./markers/', 300)
-
-# Export all dictionary markers as 3.5 cm pictures with 300 dpi resolution
-aruco_dictionary.save('./markers/', 3.5, 300)
-```
-
-!!! note
- There is **A4_DICT_APRILTAG_16h5_5cm_0-7.pdf** file located in *./src/argaze/ArUcoMarkers/utils/* folder ready to be printed on A4 paper sheet.
-
-Let's print some of them before to go further.
-
-!!! warning
- Print markers with a blank zone around them to help in their detection.
-
-## Describe ArUco markers place
-
-Once [ArUcoMarkers](../../argaze.md/#argaze.ArUcoMarkers.ArUcoMarker) pictures are placed into a scene it is possible to describe their 3D places into a file.
-
-![ArUco scene](../../img/aruco_scene.png)
-
-Where ever the origin point is, all markers places need to be described in a [right-handed 3D axis](https://robotacademy.net.au/lesson/right-handed-3d-coordinate-frame/) where:
-
-* +X is pointing to the right,
-* +Y is pointing to the top,
-* +Z is pointing to the backward.
-
-!!! warning
- All ArUco markers spatial values must be given in **centimeters**.
-
-### Edit OBJ file description
-
-OBJ file format could be exported from most 3D editors.
-
-``` obj
-o DICT_APRILTAG_16h5#0_Marker
-v -5.000000 14.960000 0.000000
-v 0.000000 14.960000 0.000000
-v -5.000000 19.959999 0.000000
-v 0.000000 19.959999 0.000000
-vn 0.0000 0.0000 1.0000
-s off
-f 1//1 2//1 4//1 3//1
-o DICT_APRILTAG_16h5#1_Marker
-v 25.000000 14.960000 0.000000
-v 30.000000 14.960000 0.000000
-v 25.000000 19.959999 0.000000
-v 30.000000 19.959999 0.000000
-vn 0.0000 0.0000 1.0000
-s off
-f 5//2 6//2 8//2 7//2
-o DICT_APRILTAG_16h5#2_Marker
-v -5.000000 -5.000000 0.000000
-v 0.000000 -5.000000 0.000000
-v -5.000000 0.000000 0.000000
-v 0.000000 0.000000 0.000000
-vn 0.0000 0.0000 1.0000
-s off
-f 9//3 10//3 12//3 11//3
-o DICT_APRILTAG_16h5#3_Marker
-v 25.000000 -5.000000 0.000000
-v 30.000000 -5.000000 0.000000
-v 25.000000 0.000000 0.000000
-v 30.000000 0.000000 0.000000
-vn 0.0000 0.0000 1.0000
-s off
-f 13//4 14//4 16//4 15//4
-```
-
-Here are common OBJ file features needed to describe ArUco markers places:
-
-* Object lines (starting with *o* key) indicate markers dictionary and id by following this format: **DICTIONARY**#**ID**\_Marker.
-* Vertice lines (starting with *v* key) indicate markers corners. The marker size will be automatically deducted from the geometry.
-* Plane normals (starting with *vn* key) need to be exported for further pose estimation.
-* Face (starting with *f* key) link vertices and normals indexes together.
-
-!!! warning
- All markers must have the same size and belong to the same dictionary.
-
-### Edit JSON file description
-
-JSON file format allows to describe markers places using translation and euler angle rotation vectors.
-
-``` json
-{
- "dictionary": "DICT_APRILTAG_16h5",
- "marker_size": 5,
- "places": {
- "0": {
- "translation": [-2.5, 17.5, 0],
- "rotation": [0.0, 0.0, 0.0]
- },
- "1": {
- "translation": [27.5, 17.5, 0],
- "rotation": [0.0, 0.0, 0.0]
- },
- "2": {
- "translation": [-2.5, -2.5, 0],
- "rotation": [0.0, 0.0, 0.0]
- },
- "3": {
- "translation": [27.5, -2.5, 0],
- "rotation": [0.0, 0.0, 0.0]
- }
- }
-}
-```