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Log gaze analysis
=================
[ArFrame](../../argaze.md/#argaze.ArFeatures.ArFrame) and [ArLayer](../../argaze.md/#argaze.ArFeatures.ArLayer) analysis can be logged by registering observers to their **look** method.
## Export gaze analysis to CSV file
[ArFrame](../../argaze.md/#argaze.ArFeatures.ArFrame) and [ArLayer](../../argaze.md/#argaze.ArFeatures.ArLayer) have an observers attribute to enable pipeline execution logging.
Here is an extract from the JSON ArFrame configuration file where logging is enabled for the [ArFrame](../../argaze.md/#argaze.ArFeatures.ArFrame) and for one [ArLayer](../../argaze.md/#argaze.ArFeatures.ArLayer) by pointing to dedicated Python files:
```json
{
"name": "My FullHD screen",
"size": [1920, 1080],
"observers": "my_frame_logger.py",
...
"layers": {
"MyLayer": {
"observers": "my_layer_logger.py",
...
}
}
}
```
!!! note
[ArFrame](../../argaze.md/#argaze.ArFeatures.ArFrame) and its [ArLayers](../../argaze.md/#argaze.ArFeatures.ArLayer) automatically notify **look** method observers after each call.
Here is *my_frame_logger.py* file:
```python
from argaze import DataFeatures
from argaze.utils import UtilsFeatures
class ScanPathAnalysisLogger(DataFeatures.PipelineStepObserver, UtilsFeatures.FileWriter):
def on_look(self, timestamp, ar_frame, exception):
"""Log scan path metrics"""
if ar_frame.analysis_available:
log = (
timestamp,
ar_frame.scan_path_analyzers['argaze.GazeAnalysis.Basic'].path_duration,
ar_frame.scan_path_analyzers['argaze.GazeAnalysis.Basic'].steps_number
)
# Write to file
self.write(log)
# Export logger as observer
__observers__ = {
"Scan path analysis logger": ScanPathAnalysisLogger(path="./scan_path_metrics.csv", header=("Timestamp (ms)", "Duration (ms)", "Steps number"))
}
```
Assuming that [ArGaze.GazeAnalysis.Basic](../../argaze.md/#argaze.GazeAnalysis.Basic) scan path analysis module is enabled for 'My FullHD screen' ArFrame, a ***scan_path_metrics.csv*** file would be created:
|Timestamp (ms)|Duration (ms)|Steps number|
|:-------------|:------------|:-----------|
|3460 |1750 |2 |
|4291 |2623 |3 |
|4769 |3107 |4 |
|6077 |4411 |5 |
|6433 |4760 |6 |
|7719 |6050 |7 |
|... |... |... |
Here is *my_layer_logger.py* file:
```python
from argaze import DataFeatures
from argaze.utils import UtilsFeatures
class AOIScanPathAnalysisLogger(DataFeatures.PipelineStepObserver, UtilsFeatures.FileWriter):
def on_look(self, timestamp, ar_layer, exception):
"""Log aoi scan path metrics."""
if ar_layer.analysis_available:
log = (
timestamp,
ar_layer.aoi_scan_path_analyzers['argaze.GazeAnalysis.NGram'].ngrams_count
)
# Write to file
self.write(log)
# Export logger as observer
__observers__ = {
"AOI Scan path analysis logger": AOIScanPathAnalysisLogger(path="./aoi_scan_path_metrics.csv", header=("Timestamp (ms)", "NGram counts"))
}
```
Assuming that [ArGaze.GazeAnalysis.NGram](../../argaze.md/#argaze.GazeAnalysis.NGram) AOI scan path analysis module is enabled for 'MyLayer' ArLayer, a ***aoi_scan_path_metrics.csv*** file would be created:
|Timestamp (ms)|NGram counts|
|:-------------|:-----------|
|5687 |"{3: {}, 4: {}, 5: {}}"|
|6208 |"{3: {('LeftPanel', 'GeoSector', 'CircularWidget'): 1}, 4: {}, 5: {}}"|
|... |... |
!!! note ""
Learn to [script the pipeline](./advanced_topics/scripting.md) to know more about [ArFrame](../../argaze.md/#argaze.ArFeatures.ArFrame) and [ArLayers](../../argaze.md/#argaze.ArFeatures.ArLayer) attributes.
### Export gaze analysis to video file
As explained in [pipeline steps visualisation chapter](visualisation.md), it is possible to get [ArFrame.image](../../argaze.md/#argaze.ArFeatures.ArFrame.image) once timestamped gaze positions have been processed by [ArFrame.look](../../argaze.md/#argaze.ArFeatures.ArFrame.look) method.
```python
from argaze import DataFeatures
from argaze.utils import UtilsFeatures
class VideoRecorder(DataFeatures.PipelineStepObserver, UtilsFeatures.VideoWriter):
def on_look(self, timestamp, ar_frame, exception):
"""Record frame image into video file."""
self.write(ar_frame.image())
# Export recorder as observer
__observers__ = {
"Video recorder": VideoRecorder(path="./video.mp4", width=1920, height=1080, fps=15)
}
```
Assuming that [ArFrame.image_parameters](../../argaze.md/#argaze.ArFeatures.ArFrame.image_parameters) are provided, ***video.mp4*** file would be created.
|
