def _convert_2d_to_3d_point_undistort(point_group, camera, fbw, fbh, lcox,
lcoy, camera_fov, frame, pos, depth):
"""
Convert a 2D point (undistorted) into a 3D point, in world space.
:param point_group: Camera Point Group for camera.
:param camera: The camera to use for rolling shutter calculations.
:param fbw: Camera's film back width value.
:param fbh: Camera's film back height value.
:param lcox: Camera lens lens center offset X value.
:param lcoy: Camera lens lens center offset Y value.
:param camera_fov: Camera Field of View as list of left, right,
bottom and top.
:param frame: The 2D point's frame number (in internal 3DE frame numbers).
:param pos: Input 2D data.
:param depth: The content distance to calculate rolling shutter at.
:return: Corrected 2D point.
:rtype: vec2d
"""
focal = tde4.getCameraFocalLength(camera, frame)
r3d = vl_sdv.mat3d(tde4.getPGroupRotation3D(point_group, camera, frame))
p3d = vl_sdv.vec3d(tde4.getPGroupPosition3D(point_group, camera, frame))
left, right, bottom, top = camera_fov
p2d = [0, 0]
p2d[0] = (pos[0] - left) / (right - left)
p2d[1] = (pos[1] - bottom) / (top - bottom)
p2d = tde4.removeDistortion2D(camera, frame, p2d)
p2d_cm = vl_sdv.vec2d((p2d[0] - 0.5) * fbw - lcox,
(p2d[1] - 0.5) * fbh - lcoy)
homogeneous_point = r3d * vl_sdv.vec3d(p2d_cm[0], p2d_cm[1], -focal).unit()
out_point = homogeneous_point * depth + p3d
return out_point
def _remove_rs_from_2d_point(point_group, camera, frame, input_2d, depth):
"""
Correct Rolling Shutter for the given input_2d point data, on frame.
:param point_group: Camera Point Group for camera.
:param camera: The camera to use for rolling shutter calculations.
:param frame: The 2D point's frame number (in internal 3DE frame numbers).
:param input_2d: Input 2D data.
:param depth: The content distance to calculate rolling shutter at.
:return: 2D point with corrected position.
:rtype: [float, float]
"""
assert isinstance(input_2d, vl_sdv.vec2d)
num_frames = tde4.getCameraNoFrames(camera)
if num_frames == 1:
return input_2d
# Static camera and lens values.
camera_fps = tde4.getCameraFPS(camera)
camera_fov = tde4.getCameraFOV(camera)
lens = tde4.getCameraLens(camera)
fbw = tde4.getLensFBackWidth(lens)
fbh = tde4.getLensFBackHeight(lens)
lcox = tde4.getLensLensCenterX(lens)
lcoy = tde4.getLensLensCenterY(lens)
rs_time_shift = tde4.getCameraRollingShutterTimeShift(camera)
rs_value = rs_time_shift * camera_fps
# Sample at previous frame
prev_pos = vl_sdv.vec3d(0, 0, 0)
prev_frame = frame - 1
if frame > 1:
prev_pos = _convert_2d_to_3d_point_undistort(
point_group, camera,
fbw, fbh, lcox, lcoy,
camera_fov,
prev_frame, input_2d, depth)
# Sample at next frame
next_pos = vl_sdv.vec3d(0, 0, 0)
next_frame = frame + 1
if frame < num_frames:
next_pos = _convert_2d_to_3d_point_undistort(
point_group, camera,
fbw, fbh, lcox, lcoy,
camera_fov,
next_frame, input_2d, depth)
# Sample at current frame
curr_pos = _convert_2d_to_3d_point_undistort(
point_group, camera,
fbw, fbh, lcox, lcoy,
camera_fov,
frame, input_2d, depth)
# Blend previous, next and current frame values based on the
# position of the 2D point vertical position and the rolling
# shutter value.
if frame == 1:
prev_pos = curr_pos + (curr_pos - next_pos)
if frame == num_frames:
next_pos = curr_pos + (curr_pos - prev_pos)
t = rs_value * (1.0 - input_2d[1])
curr_pos = _apply_rs_correction(-t, prev_pos, curr_pos, next_pos)
# Back-projection
focal = tde4.getCameraFocalLength(camera, frame)
r3d = vl_sdv.mat3d(tde4.getPGroupRotation3D(point_group, camera, frame))
p3d = vl_sdv.vec3d(tde4.getPGroupPosition3D(point_group, camera, frame))
d = r3d.trans() * (curr_pos - p3d)
p2d = [0, 0]
p2d[0] = (d[0] * focal / (-d[2] * fbw)) + (lcox / fbw) + 0.5
p2d[1] = (d[1] * focal / (-d[2] * fbh)) + (lcoy / fbh) + 0.5
p = tde4.applyDistortion2D(camera, frame, p2d)
left, right, bottom, top = camera_fov
p = vl_sdv.vec2d((p[0] * (right - left)) + left,
(p[1] * (top - bottom)) + bottom)
v = (input_2d + (input_2d - p)).list()
return v