bounding box recenter and uncenter?

[davinca]

    def uncenter(self, raw_image, search_location, edge_spacing_x, edge_spacing_y):
        self.x1 = max(0.0, self.x1 + search_location.x1 - edge_spacing_x)
        self.y1 = max(0.0, self.y1 + search_location.y1 - edge_spacing_y)
        self.x2 = min(raw_image.shape[1], self.x2 + search_location.x1 - edge_spacing_x)
        self.y2 = min(raw_image.shape[0], self.y2 + search_location.y1 - edge_spacing_y)

    def recenter(self, search_loc, edge_spacing_x, edge_spacing_y, bbox_gt_recentered):
        bbox_gt_recentered.x1 = self.x1 - search_loc.x1 + edge_spacing_x
        bbox_gt_recentered.y1 = self.y1 - search_loc.y1 + edge_spacing_y
        bbox_gt_recentered.x2 = self.x2 - search_loc.x1 + edge_spacing_x
        bbox_gt_recentered.y2 = self.y2 - search_loc.y1 + edge_spacing_y

as aforemention, I dont understand the meaning of recenter and uncenter operation?

[davinca]

I guess that the output's coordinates is relative the top left of search region, so it should convert to correct one that relative the top left of the whole image