Tracking: Implement Brown-Conrady distortion model

Implemented Brown-Conrady lens distortion model with 4 radial and
2 tangential coefficients to improve compatibility with other software,
such as Agisoft Photoscan/Metashapes, 3DF Zephir, RealityCapture,
Bentley ContextCapture, Alisevision Meshroom(opensource).

Also older programs: Bundler, CPMVS.
In general terms, most photogrammetric software.

The new model is available under the distortion model menu in Lens
settings.

For tests and demos check the original patch.

Reviewed By: sergey

Differential Revision: https://developer.blender.org/D9037
This commit is contained in:
Ivan Perevala 2020-09-30 15:12:14 +02:00 committed by Sergey Sharybin
parent 5ac4778056
commit 3a7d62cd1f
11 changed files with 471 additions and 2 deletions

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@ -25,6 +25,7 @@ using libmv::CameraIntrinsics;
using libmv::DivisionCameraIntrinsics;
using libmv::PolynomialCameraIntrinsics;
using libmv::NukeCameraIntrinsics;
using libmv::BrownCameraIntrinsics;
libmv_CameraIntrinsics *libmv_cameraIntrinsicsNew(
const libmv_CameraIntrinsicsOptions* libmv_camera_intrinsics_options) {
@ -64,6 +65,14 @@ libmv_CameraIntrinsics *libmv_cameraIntrinsicsCopy(
*nuke_intrinsics);
break;
}
case libmv::DISTORTION_MODEL_BROWN:
{
const BrownCameraIntrinsics *brown_intrinsics =
static_cast<const BrownCameraIntrinsics*>(orig_intrinsics);
new_intrinsics = LIBMV_OBJECT_NEW(BrownCameraIntrinsics,
*brown_intrinsics);
break;
}
default:
assert(!"Unknown distortion model");
}
@ -164,6 +173,35 @@ void libmv_cameraIntrinsicsUpdate(
break;
}
case LIBMV_DISTORTION_MODEL_BROWN:
{
assert(camera_intrinsics->GetDistortionModelType() ==
libmv::DISTORTION_MODEL_BROWN);
BrownCameraIntrinsics *brown_intrinsics =
(BrownCameraIntrinsics *) camera_intrinsics;
double k1 = libmv_camera_intrinsics_options->brown_k1;
double k2 = libmv_camera_intrinsics_options->brown_k2;
double k3 = libmv_camera_intrinsics_options->brown_k3;
double k4 = libmv_camera_intrinsics_options->brown_k4;
if (brown_intrinsics->k1() != k1 ||
brown_intrinsics->k2() != k2 ||
brown_intrinsics->k3() != k3 ||
brown_intrinsics->k4() != k4) {
brown_intrinsics->SetRadialDistortion(k1, k2, k3, k4);
}
double p1 = libmv_camera_intrinsics_options->brown_p1;
double p2 = libmv_camera_intrinsics_options->brown_p2;
if (brown_intrinsics->p1() != p1 || brown_intrinsics->p2() != p2) {
brown_intrinsics->SetTangentialDistortion(p1, p2);
}
break;
}
default:
assert(!"Unknown distortion model");
}
@ -228,6 +266,21 @@ void libmv_cameraIntrinsicsExtractOptions(
break;
}
case libmv::DISTORTION_MODEL_BROWN:
{
const BrownCameraIntrinsics *brown_intrinsics =
static_cast<const BrownCameraIntrinsics *>(camera_intrinsics);
camera_intrinsics_options->distortion_model =
LIBMV_DISTORTION_MODEL_BROWN;
camera_intrinsics_options->brown_k1 = brown_intrinsics->k1();
camera_intrinsics_options->brown_k2 = brown_intrinsics->k2();
camera_intrinsics_options->brown_k3 = brown_intrinsics->k3();
camera_intrinsics_options->brown_k4 = brown_intrinsics->k4();
camera_intrinsics_options->brown_p1 = brown_intrinsics->p1();
camera_intrinsics_options->brown_p2 = brown_intrinsics->p2();
break;
}
default:
assert(!"Unknown distortion model");
}
@ -366,6 +419,23 @@ static void libmv_cameraIntrinsicsFillFromOptions(
break;
}
case LIBMV_DISTORTION_MODEL_BROWN:
{
BrownCameraIntrinsics *brown_intrinsics =
static_cast<BrownCameraIntrinsics*>(camera_intrinsics);
brown_intrinsics->SetRadialDistortion(
camera_intrinsics_options->brown_k1,
camera_intrinsics_options->brown_k2,
camera_intrinsics_options->brown_k3,
camera_intrinsics_options->brown_k4);
brown_intrinsics->SetTangentialDistortion(
camera_intrinsics_options->brown_p1,
camera_intrinsics_options->brown_p2);
break;
}
default:
assert(!"Unknown distortion model");
}
@ -384,6 +454,9 @@ CameraIntrinsics* libmv_cameraIntrinsicsCreateFromOptions(
case LIBMV_DISTORTION_MODEL_NUKE:
camera_intrinsics = LIBMV_OBJECT_NEW(NukeCameraIntrinsics);
break;
case LIBMV_DISTORTION_MODEL_BROWN:
camera_intrinsics = LIBMV_OBJECT_NEW(BrownCameraIntrinsics);
break;
default:
assert(!"Unknown distortion model");
}

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@ -30,6 +30,7 @@ enum {
LIBMV_DISTORTION_MODEL_POLYNOMIAL = 0,
LIBMV_DISTORTION_MODEL_DIVISION = 1,
LIBMV_DISTORTION_MODEL_NUKE = 2,
LIBMV_DISTORTION_MODEL_BROWN = 3,
};
typedef struct libmv_CameraIntrinsicsOptions {
@ -49,6 +50,10 @@ typedef struct libmv_CameraIntrinsicsOptions {
// Nuke distortion model.
double nuke_k1, nuke_k2;
// Brown-Conrady distortion model.
double brown_k1, brown_k2, brown_k3, brown_k4;
double brown_p1, brown_p2;
} libmv_CameraIntrinsicsOptions;
libmv_CameraIntrinsics *libmv_cameraIntrinsicsNew(

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@ -50,6 +50,7 @@ enum {
OFFSET_K1,
OFFSET_K2,
OFFSET_K3,
OFFSET_K4,
OFFSET_P1,
OFFSET_P2,
@ -135,6 +136,26 @@ void ApplyDistortionModelUsingIntrinsicsBlock(
LOG(FATAL) << "Unsupported distortion model.";
return;
}
case DISTORTION_MODEL_BROWN:
{
const T& k1 = intrinsics_block[OFFSET_K1];
const T& k2 = intrinsics_block[OFFSET_K2];
const T& k3 = intrinsics_block[OFFSET_K3];
const T& k4 = intrinsics_block[OFFSET_K4];
const T& p1 = intrinsics_block[OFFSET_P1];
const T& p2 = intrinsics_block[OFFSET_P2];
ApplyBrownDistortionModel(focal_length,
focal_length,
principal_point_x,
principal_point_y,
k1, k2, k3, k4,
p1, p2,
normalized_x, normalized_y,
distorted_x, distorted_y);
return;
}
}
LOG(FATAL) << "Unknown distortion model.";
@ -168,6 +189,7 @@ void InvertDistortionModelUsingIntrinsicsBlock(
switch (invariant_intrinsics->GetDistortionModelType()) {
case DISTORTION_MODEL_POLYNOMIAL:
case DISTORTION_MODEL_DIVISION:
case DISTORTION_MODEL_BROWN:
LOG(FATAL) << "Unsupported distortion model.";
return;
@ -783,8 +805,9 @@ void EuclideanBundleCommonIntrinsics(
MAYBE_SET_CONSTANT(BUNDLE_TANGENTIAL_P2, OFFSET_P2);
#undef MAYBE_SET_CONSTANT
// Always set K3 constant, it's not used at the moment.
// Always set K3 and K4 constant, it's not used at the moment.
constant_intrinsics.push_back(OFFSET_K3);
constant_intrinsics.push_back(OFFSET_K4);
ceres::SubsetParameterization *subset_parameterization =
new ceres::SubsetParameterization(OFFSET_MAX, constant_intrinsics);

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@ -296,6 +296,72 @@ void NukeCameraIntrinsics::InvertIntrinsics(double image_x,
normalized_y);
}
// Brown model.
BrownCameraIntrinsics::BrownCameraIntrinsics()
: CameraIntrinsics() {
SetRadialDistortion(0.0, 0.0, 0.0, 0.0);
SetTangentialDistortion(0.0, 0.0);
}
BrownCameraIntrinsics::BrownCameraIntrinsics(
const BrownCameraIntrinsics &from)
: CameraIntrinsics(from) {
SetRadialDistortion(from.k1(), from.k2(), from.k3(), from.k4());
SetTangentialDistortion(from.p1(), from.p2());
}
void BrownCameraIntrinsics::SetRadialDistortion(double k1,
double k2,
double k3,
double k4) {
parameters_[OFFSET_K1] = k1;
parameters_[OFFSET_K2] = k2;
parameters_[OFFSET_K3] = k3;
parameters_[OFFSET_K4] = k4;
ResetLookupGrids();
}
void BrownCameraIntrinsics::SetTangentialDistortion(double p1,
double p2) {
parameters_[OFFSET_P1] = p1;
parameters_[OFFSET_P2] = p2;
ResetLookupGrids();
}
void BrownCameraIntrinsics::ApplyIntrinsics(double normalized_x,
double normalized_y,
double *image_x,
double *image_y) const {
ApplyBrownDistortionModel(focal_length_x(),
focal_length_y(),
principal_point_x(),
principal_point_y(),
k1(), k2(), k3(), k4(),
p1(), p2(),
normalized_x,
normalized_y,
image_x,
image_y);
}
void BrownCameraIntrinsics::InvertIntrinsics(
double image_x,
double image_y,
double *normalized_x,
double *normalized_y) const {
InvertBrownDistortionModel(focal_length_x(),
focal_length_y(),
principal_point_x(),
principal_point_y(),
k1(), k2(), k3(), k4(),
p1(), p2(),
image_x,
image_y,
normalized_x,
normalized_y);
}
std::ostream& operator <<(std::ostream &os,
const CameraIntrinsics &intrinsics) {
if (intrinsics.focal_length_x() == intrinsics.focal_length_x()) {
@ -344,6 +410,18 @@ std::ostream& operator <<(std::ostream &os,
PRINT_NONZERO_COEFFICIENT(nuke_intrinsics, k2);
break;
}
case DISTORTION_MODEL_BROWN:
{
const BrownCameraIntrinsics *brown_intrinsics =
static_cast<const BrownCameraIntrinsics *>(&intrinsics);
PRINT_NONZERO_COEFFICIENT(brown_intrinsics, k1);
PRINT_NONZERO_COEFFICIENT(brown_intrinsics, k2);
PRINT_NONZERO_COEFFICIENT(brown_intrinsics, k3);
PRINT_NONZERO_COEFFICIENT(brown_intrinsics, k4);
PRINT_NONZERO_COEFFICIENT(brown_intrinsics, p1);
PRINT_NONZERO_COEFFICIENT(brown_intrinsics, p2);
break;
}
default:
LOG(FATAL) << "Unknown distortion model.";
}

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@ -447,6 +447,71 @@ class NukeCameraIntrinsics : public CameraIntrinsics {
double parameters_[NUM_PARAMETERS];
};
class BrownCameraIntrinsics : public CameraIntrinsics {
public:
// This constants defines an offset of corresponding coefficients
// in the parameters_ array.
enum {
OFFSET_K1,
OFFSET_K2,
OFFSET_K3,
OFFSET_K4,
OFFSET_P1,
OFFSET_P2,
// This defines the size of array which we need to have in order
// to store all the coefficients.
NUM_PARAMETERS,
};
BrownCameraIntrinsics();
BrownCameraIntrinsics(const BrownCameraIntrinsics &from);
DistortionModelType GetDistortionModelType() const {
return DISTORTION_MODEL_BROWN;
}
int num_distortion_parameters() const { return NUM_PARAMETERS; }
double *distortion_parameters() { return parameters_; };
const double *distortion_parameters() const { return parameters_; };
double k1() const { return parameters_[OFFSET_K1]; }
double k2() const { return parameters_[OFFSET_K2]; }
double k3() const { return parameters_[OFFSET_K3]; }
double k4() const { return parameters_[OFFSET_K4]; }
double p1() const { return parameters_[OFFSET_P1]; }
double p2() const { return parameters_[OFFSET_P2]; }
// Set radial distortion coeffcients.
void SetRadialDistortion(double k1, double k2, double k3, double k4);
// Set tangential distortion coeffcients.
void SetTangentialDistortion(double p1, double p2);
// Apply camera intrinsics to the normalized point to get image coordinates.
//
// This applies the lens distortion to a point which is in normalized
// camera coordinates (i.e. the principal point is at (0, 0)) to get image
// coordinates in pixels.
void ApplyIntrinsics(double normalized_x,
double normalized_y,
double *image_x,
double *image_y) const;
// Invert camera intrinsics on the image point to get normalized coordinates.
//
// This reverses the effect of lens distortion on a point which is in image
// coordinates to get normalized camera coordinates.
void InvertIntrinsics(double image_x,
double image_y,
double *normalized_x,
double *normalized_y) const;
private:
double parameters_[NUM_PARAMETERS];
};
/// A human-readable representation of the camera intrinsic parameters.
std::ostream& operator <<(std::ostream &os,
const CameraIntrinsics &intrinsics);

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@ -117,6 +117,56 @@ struct InvertDivisionIntrinsicsCostFunction {
double x_, y_;
};
struct InvertBrownIntrinsicsCostFunction {
public:
typedef Vec2 FMatrixType;
typedef Vec2 XMatrixType;
InvertBrownIntrinsicsCostFunction(const double focal_length_x,
const double focal_length_y,
const double principal_point_x,
const double principal_point_y,
const double k1,
const double k2,
const double k3,
const double k4,
const double p1,
const double p2,
const double image_x,
const double image_y)
: focal_length_x_(focal_length_x),
focal_length_y_(focal_length_y),
principal_point_x_(principal_point_x),
principal_point_y_(principal_point_y),
k1_(k1), k2_(k2), k3_(k3), k4_(k4),
p1_(p1), p2_(p2),
x_(image_x), y_(image_y) {}
Vec2 operator()(const Vec2 &u) const {
double xx, yy;
ApplyBrownDistortionModel(focal_length_x_,
focal_length_y_,
principal_point_x_,
principal_point_y_,
k1_, k2_, k3_, k4_,
p1_, p2_,
u(0), u(1),
&xx, &yy);
Vec2 fx;
fx << (xx - x_), (yy - y_);
return fx;
}
double focal_length_x_;
double focal_length_y_;
double principal_point_x_;
double principal_point_y_;
double k1_, k2_, k3_, k4_;
double p1_, p2_;
double x_, y_;
};
} // namespace
void InvertPolynomialDistortionModel(const double focal_length_x,
@ -194,6 +244,46 @@ void InvertDivisionDistortionModel(const double focal_length_x,
*normalized_y = normalized(1);
}
void InvertBrownDistortionModel(const double focal_length_x,
const double focal_length_y,
const double principal_point_x,
const double principal_point_y,
const double k1,
const double k2,
const double k3,
const double k4,
const double p1,
const double p2,
const double image_x,
const double image_y,
double *normalized_x,
double *normalized_y) {
// Compute the initial guess. For a camera with no distortion, this will also
// be the final answer; the LM iteration will terminate immediately.
Vec2 normalized;
normalized(0) = (image_x - principal_point_x) / focal_length_x;
normalized(1) = (image_y - principal_point_y) / focal_length_y;
typedef LevenbergMarquardt<InvertBrownIntrinsicsCostFunction> Solver;
InvertBrownIntrinsicsCostFunction intrinsics_cost(focal_length_x,
focal_length_y,
principal_point_x,
principal_point_y,
k1, k2, k3, k4,
p1, p2,
image_x, image_y);
Solver::SolverParameters params;
Solver solver(intrinsics_cost);
/*Solver::Results results =*/ solver.minimize(params, &normalized);
// TODO(keir): Better error handling.
*normalized_x = normalized(0);
*normalized_y = normalized(1);
}
struct ApplyNukeIntrinsicsCostFunction {
public:
typedef Vec2 FMatrixType;

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@ -29,6 +29,7 @@ enum DistortionModelType {
DISTORTION_MODEL_POLYNOMIAL,
DISTORTION_MODEL_DIVISION,
DISTORTION_MODEL_NUKE,
DISTORTION_MODEL_BROWN,
};
// Invert camera intrinsics on the image point to get normalized coordinates.
@ -202,6 +203,58 @@ void ApplyNukeDistortionModel(const double focal_length_x,
double *image_x,
double *image_y);
} // namespace libmv
// Invert camera intrinsics on the image point to get normalized coordinates.
// This inverts the radial lens distortion to a point which is in image pixel
// coordinates to get normalized coordinates.
void InvertBrownDistortionModel(const double focal_length_x,
const double focal_length_y,
const double principal_point_x,
const double principal_point_y,
const double k1,
const double k2,
const double k3,
const double k4,
const double p1,
const double p2,
const double image_x,
const double image_y,
double *normalized_x,
double *normalized_y);
template <typename T>
inline void ApplyBrownDistortionModel(const T &focal_length_x,
const T &focal_length_y,
const T &principal_point_x,
const T &principal_point_y,
const T &k1,
const T &k2,
const T &k3,
const T &k4,
const T &p1,
const T &p2,
const T &normalized_x,
const T &normalized_y,
T *image_x,
T *image_y) {
T x = normalized_x;
T y = normalized_y;
// Apply distortion to the normalized points to get (xd, yd).
T x2 = x * x;
T y2 = y * y;
T xy2 = T(2) * x * y;
T r2 = x2 + y2;
T r_coeff = T(1) + (((k4 * r2 + k3) * r2 + k2) * r2 + k1) * r2;
T tx = p1 * (r2 + T(2) * x2) + p2 * xy2;
T ty = p2 * (r2 + T(2) * y2) + p1 * xy2;
T xd = x * r_coeff + tx;
T yd = y * r_coeff + ty;
// Apply focal length and principal point to get the final image coordinates.
*image_x = focal_length_x * xd + principal_point_x;
*image_y = focal_length_y * yd + principal_point_y;
} // namespace libmv
}
#endif // LIBMV_SIMPLE_PIPELINE_DISTORTION_MODELS_H_

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@ -687,6 +687,8 @@ typedef struct MovieClipCache {
float polynomial_k[3];
float division_k[2];
float nuke_k[2];
float brown_k[4];
float brown_p[2];
short distortion_model;
bool undistortion_used;
@ -1134,10 +1136,18 @@ static bool check_undistortion_cache_flags(const MovieClip *clip)
if (!equals_v2v2(&camera->division_k1, cache->postprocessed.division_k)) {
return false;
}
if (!equals_v2v2(&camera->nuke_k1, cache->postprocessed.nuke_k)) {
return false;
}
if (!equals_v4v4(&camera->brown_k1, cache->postprocessed.brown_k)) {
return false;
}
if (!equals_v2v2(&camera->brown_p1, cache->postprocessed.brown_p)) {
return false;
}
return true;
}
@ -1240,6 +1250,8 @@ static void put_postprocessed_frame_to_cache(
copy_v3_v3(cache->postprocessed.polynomial_k, &camera->k1);
copy_v2_v2(cache->postprocessed.division_k, &camera->division_k1);
copy_v2_v2(cache->postprocessed.nuke_k, &camera->nuke_k1);
copy_v4_v4(cache->postprocessed.brown_k, &camera->brown_k1);
copy_v2_v2(cache->postprocessed.brown_p, &camera->brown_p1);
cache->postprocessed.undistortion_used = true;
}
else {

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@ -457,6 +457,15 @@ static void distortion_model_parameters_from_tracking(
camera_intrinsics_options->nuke_k1 = camera->nuke_k1;
camera_intrinsics_options->nuke_k2 = camera->nuke_k2;
return;
case TRACKING_DISTORTION_MODEL_BROWN:
camera_intrinsics_options->distortion_model = LIBMV_DISTORTION_MODEL_BROWN;
camera_intrinsics_options->brown_k1 = camera->brown_k1;
camera_intrinsics_options->brown_k2 = camera->brown_k2;
camera_intrinsics_options->brown_k3 = camera->brown_k3;
camera_intrinsics_options->brown_k4 = camera->brown_k4;
camera_intrinsics_options->brown_p1 = camera->brown_p1;
camera_intrinsics_options->brown_p2 = camera->brown_p2;
return;
}
/* Unknown distortion model, which might be due to opening newer file in older Blender.
@ -491,6 +500,15 @@ static void distortion_model_parameters_from_options(
camera->nuke_k1 = camera_intrinsics_options->nuke_k1;
camera->nuke_k2 = camera_intrinsics_options->nuke_k2;
return;
case LIBMV_DISTORTION_MODEL_BROWN:
camera->distortion_model = TRACKING_DISTORTION_MODEL_BROWN;
camera->brown_k1 = camera_intrinsics_options->brown_k1;
camera->brown_k2 = camera_intrinsics_options->brown_k2;
camera->brown_k3 = camera_intrinsics_options->brown_k3;
camera->brown_k4 = camera_intrinsics_options->brown_k4;
camera->brown_p1 = camera_intrinsics_options->brown_p1;
camera->brown_p2 = camera_intrinsics_options->brown_p2;
return;
}
/* Libmv returned distortion model which is not known to Blender. This is a logical error in code

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@ -72,6 +72,12 @@ typedef struct MovieTrackingCamera {
/* Nuke distortion model coefficients */
float nuke_k1, nuke_k2;
/* Brown-Conrady distortion model coefficients */
/** Brown-Conrady radial distortion **/
float brown_k1, brown_k2, brown_k3, brown_k4;
/** Brown-Conrady tangential distortion **/
float brown_p1, brown_p2;
} MovieTrackingCamera;
typedef struct MovieTrackingMarker {
@ -458,6 +464,7 @@ enum {
TRACKING_DISTORTION_MODEL_POLYNOMIAL = 0,
TRACKING_DISTORTION_MODEL_DIVISION = 1,
TRACKING_DISTORTION_MODEL_NUKE = 2,
TRACKING_DISTORTION_MODEL_BROWN = 3,
};
/* MovieTrackingCamera->units */

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@ -1148,6 +1148,7 @@ static void rna_def_trackingCamera(BlenderRNA *brna)
"Division distortion model which "
"better represents wide-angle cameras"},
{TRACKING_DISTORTION_MODEL_NUKE, "NUKE", 0, "Nuke", "Nuke distortion model"},
{TRACKING_DISTORTION_MODEL_BROWN, "BROWN", 0, "Brown", "Brown-Conrady distortion model"},
{0, NULL, 0, NULL, NULL},
};
@ -1263,6 +1264,50 @@ static void rna_def_trackingCamera(BlenderRNA *brna)
RNA_def_property_ui_text(prop, "K2", "Second coefficient of second order Nuke distortion");
RNA_def_property_update(prop, NC_MOVIECLIP | NA_EDITED, "rna_tracking_flushUpdate");
/* Brown-Conrady distortion parameters */
prop = RNA_def_property(srna, "brown_k1", PROP_FLOAT, PROP_NONE);
RNA_def_property_clear_flag(prop, PROP_ANIMATABLE);
RNA_def_property_ui_range(prop, -10, 10, 0.1, 3);
RNA_def_property_ui_text(
prop, "K1", "First coefficient of fourth order Brown-Conrady radial distortion");
RNA_def_property_update(prop, NC_MOVIECLIP | NA_EDITED, "rna_tracking_flushUpdate");
prop = RNA_def_property(srna, "brown_k2", PROP_FLOAT, PROP_NONE);
RNA_def_property_clear_flag(prop, PROP_ANIMATABLE);
RNA_def_property_ui_range(prop, -10, 10, 0.1, 3);
RNA_def_property_ui_text(
prop, "K2", "Second coefficient of fourth order Brown-Conrady radial distortion");
RNA_def_property_update(prop, NC_MOVIECLIP | NA_EDITED, "rna_tracking_flushUpdate");
prop = RNA_def_property(srna, "brown_k3", PROP_FLOAT, PROP_NONE);
RNA_def_property_clear_flag(prop, PROP_ANIMATABLE);
RNA_def_property_ui_range(prop, -10, 10, 0.1, 3);
RNA_def_property_ui_text(
prop, "K3", "Third coefficient of fourth order Brown-Conrady radial distortion");
RNA_def_property_update(prop, NC_MOVIECLIP | NA_EDITED, "rna_tracking_flushUpdate");
prop = RNA_def_property(srna, "brown_k4", PROP_FLOAT, PROP_NONE);
RNA_def_property_clear_flag(prop, PROP_ANIMATABLE);
RNA_def_property_ui_range(prop, -10, 10, 0.1, 3);
RNA_def_property_ui_text(
prop, "K4", "Fourth coefficient of fourth order Brown-Conrady radial distortion");
RNA_def_property_update(prop, NC_MOVIECLIP | NA_EDITED, "rna_tracking_flushUpdate");
prop = RNA_def_property(srna, "brown_p1", PROP_FLOAT, PROP_NONE);
RNA_def_property_clear_flag(prop, PROP_ANIMATABLE);
RNA_def_property_ui_range(prop, -10, 10, 0.1, 3);
RNA_def_property_ui_text(
prop, "P1", "First coefficient of second order Brown-Conrady tangential distortion");
RNA_def_property_update(prop, NC_MOVIECLIP | NA_EDITED, "rna_tracking_flushUpdate");
prop = RNA_def_property(srna, "brown_p2", PROP_FLOAT, PROP_NONE);
RNA_def_property_clear_flag(prop, PROP_ANIMATABLE);
RNA_def_property_ui_range(prop, -10, 10, 0.1, 3);
RNA_def_property_ui_text(
prop, "P2", "Second coefficient of second order Brown-Conrady tangential distortion");
RNA_def_property_update(prop, NC_MOVIECLIP | NA_EDITED, "rna_tracking_flushUpdate");
/* pixel aspect */
prop = RNA_def_property(srna, "pixel_aspect", PROP_FLOAT, PROP_XYZ);
RNA_def_property_float_sdna(prop, NULL, "pixel_aspect");