Operator Reference

HALCON Operator Reference / 3D Reconstruction / Photometric Stereo
ClassesClasses | | Operators

estimate_al_amestimate_al_amEstimateAlAmEstimateAlAmestimate_al_am (Operator)

estimate_al_amestimate_al_amEstimateAlAmEstimateAlAmestimate_al_am — Estimate the albedo of a surface and the amount of ambient light.

Signature

estimate_al_am(Image : : : Albedo, Ambient)

Herror estimate_al_am(const Hobject Image, double* Albedo, double* Ambient)

Herror T_estimate_al_am(const Hobject Image, Htuple* Albedo, Htuple* Ambient)

void EstimateAlAm(const HObject& Image, HTuple* Albedo, HTuple* Ambient)

HTuple HImage::EstimateAlAm(HTuple* Ambient) const

double HImage::EstimateAlAm(double* Ambient) const

static void HOperatorSet.EstimateAlAm(HObject image, out HTuple albedo, out HTuple ambient)

HTuple HImage.EstimateAlAm(out HTuple ambient)

double HImage.EstimateAlAm(out double ambient)

def estimate_al_am(image: HObject) -> Tuple[Sequence[float], Sequence[float]]

def estimate_al_am_s(image: HObject) -> Tuple[float, float]

Description

estimate_al_amestimate_al_amEstimateAlAmEstimateAlAmestimate_al_am estimates the AlbedoAlbedoAlbedoalbedoalbedo of a surface, i.e. the percentage of light reflected by the surface, and the amount of ambient light AmbientAmbientAmbientambientambient by using the maximum and minimum gray values of the image.

Attention

It is assumed that the image contains at least one point for which the reflection function assumes its minimum, e.g., points in shadows. Furthermore, it is assumed that the image contains at least one point for which the reflection function assumes its maximum. If this is not the case, wrong values will be estimated.

Execution Information

  • Multithreading type: reentrant (runs in parallel with non-exclusive operators).
  • Multithreading scope: global (may be called from any thread).
  • Automatically parallelized on tuple level.

Parameters

ImageImageImageimageimage (input_object)  singlechannelimage(-array) → objectHImageHObjectHObjectHobject (byte)

Image for which albedo and ambient are to be estimated.

AlbedoAlbedoAlbedoalbedoalbedo (output_control)  real(-array) → HTupleSequence[float]HTupleHtuple (real) (double) (double) (double)

Amount of light reflected by the surface.

AmbientAmbientAmbientambientambient (output_control)  real(-array) → HTupleSequence[float]HTupleHtuple (real) (double) (double) (double)

Amount of ambient light.

Result

estimate_al_amestimate_al_amEstimateAlAmEstimateAlAmestimate_al_am always returns the value 2 ( H_MSG_TRUE) .

Possible Successors

sfs_mod_lrsfs_mod_lrSfsModLrSfsModLrsfs_mod_lr, sfs_orig_lrsfs_orig_lrSfsOrigLrSfsOrigLrsfs_orig_lr, sfs_pentlandsfs_pentlandSfsPentlandSfsPentlandsfs_pentland, photometric_stereophotometric_stereoPhotometricStereoPhotometricStereophotometric_stereo, shade_height_fieldshade_height_fieldShadeHeightFieldShadeHeightFieldshade_height_field

Module

3D Metrology

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