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# SPDX-License-Identifier: GPL-2.0-or-later
bl_info = {
"name": "Refine tracking solution",
"author": "Stephen Leger",
"license": "GPL",
"version": (1, 1, 5),
"blender": (2, 80, 0),
"location": "Clip Editor > Tools > Solve > Refine Solution",
"description": "Refine motion solution by setting track weight according"
" to reprojection error",
"warning": "",
"doc_url": "{BLENDER_MANUAL_URL}/addons/video_tools/refine_tracking.html",
"category": "Video Tools",
}
import bpy
from bpy.types import (
Operator,
Panel,
)
from bpy.props import FloatProperty
from mathutils import Vector
class TRACKING_OP_refine_solution(Operator):
bl_idname = "tracking.refine_solution"
bl_label = "Refine"
bl_description = "Set track weight by error and solve camera motion"
bl_options = {"UNDO"}
@classmethod
def poll(cls, context):
return (context.area and context.area.spaces and
hasattr(context.area.spaces.active, 'clip') and
context.area.spaces.active.clip is not None
)
def execute(self, context):
error = context.window_manager.TrackingTargetError
smooth = context.window_manager.TrackingSmooth
clip = context.area.spaces.active.clip
try:
tracking = clip.tracking
tracks = tracking.tracks
winx = float(clip.size[0])
winy = float(clip.size[1])
aspy = 1.0 / tracking.camera.pixel_aspect
start = tracking.reconstruction.cameras[0].frame
end = tracking.reconstruction.cameras[-1].frame
except:
return {'CANCELLED'}
marker_position = Vector()
for frame in range(start, end):
camera = tracking.reconstruction.cameras.find_frame(frame=frame)
if camera is not None:
camera_invert = camera.matrix.inverted()
else:
continue
for track in tracking.tracks:
marker = track.markers.find_frame(frame)
if marker is None:
continue
# weight incomplete tracks on start and end
if frame > start + smooth and frame < end - smooth:
for m in track.markers:
if not m.mute:
tstart = m
break
for m in reversed(track.markers):
if not m.mute:
tend = m
break
dt = min(0.5 * (tend.frame - tstart.frame), smooth)
if dt > 0:
t0 = min(1.0, (frame - tstart.frame) / dt)
t1 = min(1.0, (tend.frame - frame) / dt)
tw = min(t0, t1)
else:
tw = 0.0
else:
tw = 1.0
reprojected_position = camera_invert @ track.bundle
if reprojected_position.z == 0:
track.weight = 0
track.keyframe_insert("weight", frame=frame)
continue
reprojected_position = reprojected_position / -reprojected_position.z * \
tracking.camera.focal_length_pixels
reprojected_position = Vector(
(tracking.camera.principal[0] + reprojected_position[0],
tracking.camera.principal[1] * aspy + reprojected_position[1], 0)
)
marker_position[0] = (marker.co[0] + track.offset[0]) * winx
marker_position[1] = (marker.co[1] + track.offset[1]) * winy * aspy
dp = marker_position - reprojected_position
if dp.length == 0:
track.weight = 1.0
else:
track.weight = min(1.0, tw * error / dp.length)
track.keyframe_insert("weight", frame=frame)
bpy.ops.clip.solve_camera('INVOKE_DEFAULT')
return{'FINISHED'}
class TRACKING_OP_reset_solution(Operator):
bl_idname = "tracking.reset_solution"
bl_label = "Reset"
bl_description = "Reset track weight and solve camera motion"
bl_options = {"UNDO"}
@classmethod
def poll(cls, context):
return (context.area.spaces.active.clip is not None)
def execute(self, context):
clip = context.area.spaces.active.clip
try:
tracking = clip.tracking
tracks = tracking.tracks
start = tracking.reconstruction.cameras[0].frame
end = tracking.reconstruction.cameras[-1].frame
except:
return {'CANCELLED'}
start = tracking.reconstruction.cameras[0].frame
end = tracking.reconstruction.cameras[-1].frame
for frame in range(start, end):
camera = tracking.reconstruction.cameras.find_frame(frame=frame)
if camera is None:
continue
for track in tracking.tracks:
marker = track.markers.find_frame(frame=frame)
if marker is None:
continue
track.weight = 1.0
track.keyframe_insert("weight", frame=frame)
bpy.ops.clip.solve_camera('INVOKE_DEFAULT')
return{'FINISHED'}
class TRACKING_PT_RefineMotionTracking(Panel):
bl_label = "Refine solution"
bl_space_type = "CLIP_EDITOR"
bl_region_type = "TOOLS"
bl_category = "Solve"
@classmethod
def poll(cls, context):
return (context.area.spaces.active.clip is not None)
def draw(self, context):
layout = self.layout
col = layout.column(align=True)
col.prop(context.window_manager, "TrackingTargetError", text="Target error")
col.prop(context.window_manager, "TrackingSmooth", text="Smooth transition")
sub_box = col.box()
sub_box.scale_y = 0.25
row = col.row(align=True)
row.operator("tracking.refine_solution")
row.operator("tracking.reset_solution")
classes =(
TRACKING_OP_refine_solution,
TRACKING_OP_reset_solution,
TRACKING_PT_RefineMotionTracking
)
def register():
bpy.types.WindowManager.TrackingTargetError = FloatProperty(
name="Target Error",
description="Refine motion track target error",
default=0.3,
min=0.01
)
bpy.types.WindowManager.TrackingSmooth = FloatProperty(
name="Smooth Transition",
description="Smooth weight transition on start and end of incomplete tracks",
default=25,
min=1
)
for cls in classes:
bpy.utils.register_class(cls)
def unregister():
for cls in reversed(classes):
bpy.utils.unregister_class(cls)
del bpy.types.WindowManager.TrackingTargetError
del bpy.types.WindowManager.TrackingSmooth
if __name__ == "__main__":
register()
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