ClassesClasses | | Operators

measure_projectionT_measure_projectionMeasureProjectionMeasureProjection (Operator)

Name

measure_projectionT_measure_projectionMeasureProjectionMeasureProjection — Extract a gray value profile perpendicular to a rectangle or annular arc.

Signature

measure_projection(Image : : MeasureHandle : GrayValues)

Herror T_measure_projection(const Hobject Image, const Htuple MeasureHandle, Htuple* GrayValues)

void MeasureProjection(const HObject& Image, const HTuple& MeasureHandle, HTuple* GrayValues)

HTuple HMeasure::MeasureProjection(const HImage& Image) const

HTuple HImage::MeasureProjection(const HMeasure& MeasureHandle) const

static void HOperatorSet.MeasureProjection(HObject image, HTuple measureHandle, out HTuple grayValues)

HTuple HMeasure.MeasureProjection(HImage image)

HTuple HImage.MeasureProjection(HMeasure measureHandle)

Description

measure_projectionmeasure_projectionMeasureProjectionMeasureProjectionMeasureProjection extracts a one-dimensional gray value profile perpendicular to a rectangle or annular arc. This is done by averaging the gray values in “slices” perpendicular to the major axis of the rectangle or arc. The sampling is done at subpixel positions in the image ImageImageImageImageimage at integer row and column distances (in the coordinate frame of the rectangle) from the center of the rectangle. Since this involves some calculations which can be used repeatedly in several projections, the operator gen_measure_rectangle2gen_measure_rectangle2GenMeasureRectangle2GenMeasureRectangle2GenMeasureRectangle2 is used to perform these calculations only once, thus increasing the speed of measure_projectionmeasure_projectionMeasureProjectionMeasureProjectionMeasureProjection significantly. Since there is a trade-off between accuracy and speed in the subpixel calculations of the gray values, different interpolation schemes can be selected in gen_measure_rectangle2gen_measure_rectangle2GenMeasureRectangle2GenMeasureRectangle2GenMeasureRectangle2 (the interpolation only influences rectangles not aligned with the image axes). The measure object generated with gen_measure_rectangle2gen_measure_rectangle2GenMeasureRectangle2GenMeasureRectangle2GenMeasureRectangle2 is passed in MeasureHandleMeasureHandleMeasureHandleMeasureHandlemeasureHandle.

For an explanation of the concept of 1D measuring see the introduction of chapter 1D Measuring.

Attention

It should be kept in mind that measure_projectionmeasure_projectionMeasureProjectionMeasureProjectionMeasureProjection ignores the domain of ImageImageImageImageimage for efficiency reasons. If certain regions in the image should be excluded from the measurement a new measure object with appropriately modified parameters should be generated.

Execution Information

Parameters

ImageImageImageImageimage (input_object)  singlechannelimage objectHImageHImageHobject (byte / uint2 / real)

Input image.

MeasureHandleMeasureHandleMeasureHandleMeasureHandlemeasureHandle (input_control)  measure_id HMeasure, HTupleHTupleHtuple (integer) (IntPtr) (Hlong) (Hlong)

Measure object handle.

GrayValuesGrayValuesGrayValuesGrayValuesgrayValues (output_control)  number-array HTupleHTupleHtuple (real) (double) (double) (double)

Gray value profile.

Result

If the parameter values are correct the operator measure_projectionmeasure_projectionMeasureProjectionMeasureProjectionMeasureProjection returns the value 2 (H_MSG_TRUE). Otherwise an exception is raised.

Possible Predecessors

gen_measure_rectangle2gen_measure_rectangle2GenMeasureRectangle2GenMeasureRectangle2GenMeasureRectangle2

Possible Successors

close_measureclose_measureCloseMeasureCloseMeasureCloseMeasure

Alternatives

gray_projectionsgray_projectionsGrayProjectionsGrayProjectionsGrayProjections

Module

1D Metrology


ClassesClasses | | Operators