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"""Module for matching algorithm based on fixation's focus point
This program is free software: you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free Software
Foundation, either version 3 of the License, or (at your option) any later
version.
This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
this program. If not, see <https://www.gnu.org/licenses/>.
"""
__author__ = "Théo de la Hogue"
__credits__ = []
__copyright__ = "Copyright 2023, Ecole Nationale de l'Aviation Civile (ENAC)"
__license__ = "GPLv3"
import cv2
import numpy
from argaze import GazeFeatures, DataFeatures
from argaze.AreaOfInterest import AOIFeatures
class AOIMatcher(GazeFeatures.AOIMatcher):
"""Matching algorithm based on fixation's focus point."""
@DataFeatures.PipelineStepInit
def __init__(self, **kwargs):
# Init AOIMatcher class
super().__init__()
self.__looked_aoi_data = (None, None)
self.__matched_gaze_movement = None
def __reset(self):
self.__looked_aoi_data = (None, None)
self.__matched_gaze_movement = None
@DataFeatures.PipelineStepMethod
def match(self, gaze_movement: GazeFeatures.GazeMovement, aoi_scene) -> tuple[str, AOIFeatures.AreaOfInterest]:
"""Returns AOI containing fixation focus point."""
if GazeFeatures.is_fixation(gaze_movement):
for name, aoi in aoi_scene.items():
if name not in self.exclude and aoi.contains_point(gaze_movement.focus):
# Update looked aoi data
self.__looked_aoi_data = (name, aoi)
# Update matched gaze movement
self.__matched_gaze_movement = gaze_movement
return self.__looked_aoi_data
elif GazeFeatures.is_saccade(gaze_movement):
self.__reset()
return (None, None)
def draw(self, image: numpy.array, aoi_scene: AOIFeatures.AOIScene, draw_matched_fixation: dict = None,
draw_looked_aoi: dict = None, looked_aoi_name_color: tuple = None, looked_aoi_name_offset: tuple = (0, 0)):
"""Draw matching into image.
Parameters:
image: where to draw
aoi_scene: to refresh looked aoi if required
draw_matched_fixation: Fixation.draw parameters (which depends on the loaded gaze movement identifier
module, if None, no fixation is drawn)
draw_looked_aoi: AOIFeatures.AOI.draw parameters (if None, no looked aoi is drawn)
looked_aoi_name_color: color of text (if None, no looked aoi name is drawn)
looked_aoi_name_offset: offset of text from the upper left aoi bounding box corner
"""
if self.__matched_gaze_movement is not None:
if GazeFeatures.is_fixation(self.__matched_gaze_movement):
# Draw matched fixation if required
if draw_matched_fixation is not None:
self.__matched_gaze_movement.draw(image, **draw_matched_fixation)
# Draw matched aoi
if self.looked_aoi().all() is not None:
# Draw looked aoi if required
if draw_looked_aoi is not None:
self.looked_aoi().draw(image, **draw_looked_aoi)
# Draw looked aoi name if required
if looked_aoi_name_color is not None:
top_left_corner_pixel = numpy.rint(self.looked_aoi().bounding_box[0]).astype(int) + looked_aoi_name_offset
cv2.putText(image, self.looked_aoi_name(), top_left_corner_pixel, cv2.FONT_HERSHEY_SIMPLEX, 1, looked_aoi_name_color, 1, cv2.LINE_AA)
def looked_aoi(self) -> AOIFeatures.AreaOfInterest:
"""Get most likely looked aoi for current fixation."""
return self.__looked_aoi_data[1]
def looked_aoi_name(self) -> str:
"""Get most likely looked aoi name for current fixation."""
return self.__looked_aoi_data[0]
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