def local_to_global_cam()

in phosa/utils/camera.py [0:0]

• 14 lines of code
• 2 McCabe index (conditional complexity)

def local_to_global_cam(bboxes, cams, L):
    """
    Converts a weak-perspective camera w.r.t. a bounding box to a weak-perspective
    camera w.r.t. to the entire image.

    Args:
        bboxes (N x 4): Bounding boxes in xyxy format.
        cams (N x 3): Weak perspective camera.
        L (int): Max of height and width of image.
    """
    square_bboxes = make_bbox_square(bbox_xy_to_wh(bboxes))
    global_cams = []
    for cam, bbox in zip(cams, square_bboxes):
        x, y, b, _ = bbox
        X = np.stack((x, y))
        # Bbox space [0, b]
        s_crop = b * cam[0] / 2
        t_crop = cam[1:] + 1 / cam[0]

        # Global image space [0, 1]
        s_og = s_crop / L
        t_og = t_crop + X / s_crop

        # Normalized global space [-1, 1]
        s = s_og * 2
        t = t_og - 0.5 / s_og
        global_cams.append(np.concatenate((np.array([s]), t)))
    return np.stack(global_cams)