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Enable AOI analysis
===================
Once [ArFrame](../../argaze.md/#argaze.ArFeatures.ArFrame) is [configured](configuration_and_execution.md) and [2D AOI are described](aoi_2d_description.md), fixation can be matched with AOI to build an AOI scan path before analyzing it.
## Add ArLayer to ArFrame JSON configuration file
The [ArLayer](../../argaze.md/#argaze.ArFeatures.ArLayer) class defines a space where to match fixations with AOI and inside which those matches need to be analyzed.
Here is an extract from the JSON [ArFrame](../../argaze.md/#argaze.ArFeatures.ArFrame) configuration file with a sample where one layer is added:
```json
{
"argaze.ArFeatures.ArFrame": {
"name": "My FullHD screen",
"size": [1920, 1080],
...
"layers": {
"MyLayer": {
"aoi_scene" : {
"GeoSector": [[860, 160], [1380, 100], [1660, 400], [1380, 740], [1440, 960], [920, 920], [680, 800], [640, 560]],
"LeftPanel": {
"Rectangle": {
"x": 0,
"y": 0,
"width": 350,
"height": 1080
}
},
"CircularWidget": {
"Circle": {
"cx": 1800,
"cy": 120,
"radius": 80
}
}
},
"aoi_matcher": {
"argaze.GazeAnalysis.DeviationCircleCoverage.AOIMatcher": {
"coverage_threshold": 0.5
}
},
"aoi_scan_path": {
"duration_max": 30000
},
"aoi_scan_path_analyzers": {
"argaze.GazeAnalysis.Basic.AOIScanPathAnalyzer": {},
"argaze.GazeAnalysis.TransitionMatrix.AOIScanPathAnalyzer": {},
"argaze.GazeAnalysis.NGram.AOIScanPathAnalyzer": {
"n_min": 3,
"n_max": 5
}
}
}
}
}
}
```
!!! note
Timestamped gaze movements identified by the parent [ArFrame](../../argaze.md/#argaze.ArFeatures.ArFrame) are passed one by one to each [ArLayer](../../argaze.md/#argaze.ArFeatures.ArLayer). So, the execution of all [ArLayers](../../argaze.md/#argaze.ArFeatures.ArLayer) is done during the parent [ArFrame.look](../../argaze.md/#argaze.ArFeatures.ArFrame.look) method call, as explained in the [previous chapter](configuration_and_execution.md).
Now, let's understand the meaning of each JSON entry.
### *layers*
An [ArFrame](../../argaze.md/#argaze.ArFeatures.ArFrame) instance can contains multiples [ArLayers](../../argaze.md/#argaze.ArFeatures.ArLayer) stored by name.
### MyLayer
The name of an [ArLayer](../../argaze.md/#argaze.ArFeatures.ArLayer). Basically, it is useful for visualization purposes.
### *aoi_scene*
The set of 2D AOI into the layer as defined at [2D AOI description chapter](aoi_2d_description.md).
### *aoi_matcher*
The first [ArLayer](../../argaze.md/#argaze.ArFeatures.ArLayer) pipeline step aims to match identified gaze movement with the layer's AOI.
The matching algorithm can be selected by instantiating a particular [AOIMatcher from the GazeAnalysis submodule](pipeline_modules/aoi_matchers.md) or [from another Python package](advanced_topics/module_loading.md).
In the example file, the chosen matching algorithm is the [Deviation Circle Coverage](../../argaze.md/#argaze.GazeAnalysis.DeviationCircleCoverage) which has one specific *coverage_threshold* attribute.
!!! warning "Mandatory"
JSON *aoi_matcher* entry is mandatory. Otherwise, the [AOIScanPath](../../argaze.md/#argaze.GazeFeatures.AOIScanPath) and [AOIScanPathAnalyzers](../../argaze.md/#argaze.GazeFeatures.AOIScanPathAnalyzer) steps are disabled.
### *aoi_scan_path*
The second [ArLayer](../../argaze.md/#argaze.ArFeatures.ArLayer) pipeline step aims to build an [AOIScanPath](../../argaze.md/#argaze.GazeFeatures.AOIScanPath) defined as a list of [AOIScanSteps](../../argaze.md/#argaze.GazeFeatures.AOIScanStep) made by a set of successive fixations/saccades onto the same AOI.
Once gaze movements are matched to AOI, they are automatically appended to the AOIScanPath if required.
The [AOIScanPath.duration_max](../../argaze.md/#argaze.GazeFeatures.AOIScanPath.duration_max) attribute is the duration from which older AOI scan steps are removed each time new AOI scan steps are added.
!!! note "Optional"
JSON *aoi_scan_path* entry is not mandatory. If *aoi_scan_path_analyzers* entry is not empty, the [AOIScanPath](../../argaze.md/#argaze.GazeFeatures.AOIScanPath) step is automatically enabled.
### *aoi_scan_path_analyzers*
Finally, the last [ArLayer](../../argaze.md/#argaze.ArFeatures.ArLayer) pipeline step consists of passing the previously built [AOIScanPath](../../argaze.md/#argaze.GazeFeatures.AOIScanPath) to each loaded [AOIScanPathAnalyzer](../../argaze.md/#argaze.GazeFeatures.AOIScanPathAnalyzer).
Each analysis algorithm can be selected by instantiating a particular [AOIScanPathAnalyzer from the GazeAnalysis submodule](pipeline_modules/aoi_scan_path_analyzers.md) or [from another Python package](advanced_topics/module_loading.md).
In the example file, the chosen analysis algorithms are the [Basic](../../argaze.md/#argaze.GazeAnalysis.Basic) module, the [TransitionMatrix](../../argaze.md/#argaze.GazeAnalysis.TransitionMatrix) module and the [NGram](../../argaze.md/#argaze.GazeAnalysis.NGram) module, which has two specific *n_min* and *n_max* attributes.
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