measure_projectionT_measure_projectionMeasureProjectionMeasureProjectionmeasure_projection (算子)

名称

measure_projectionT_measure_projectionMeasureProjectionMeasureProjectionmeasure_projection — 提取垂直于矩形或环形弧的灰度值剖面。

签名

描述

measure_projectionmeasure_projectionMeasureProjectionMeasureProjectionMeasureProjectionmeasure_projection 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 ImageImageImageImageimageimage 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_rectangle2GenMeasureRectangle2GenMeasureRectangle2GenMeasureRectangle2gen_measure_rectangle2 is used to perform these calculations only once, thus increasing the speed of measure_projectionmeasure_projectionMeasureProjectionMeasureProjectionMeasureProjectionmeasure_projection 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_rectangle2GenMeasureRectangle2GenMeasureRectangle2GenMeasureRectangle2gen_measure_rectangle2 (the interpolation only influences rectangles not aligned with the image axes). The measure object generated with gen_measure_rectangle2gen_measure_rectangle2GenMeasureRectangle2GenMeasureRectangle2GenMeasureRectangle2gen_measure_rectangle2 is passed in MeasureHandleMeasureHandleMeasureHandleMeasureHandlemeasureHandlemeasure_handle。

For an explanation of the concept of 1D measuring see the introduction of chapter 一维测量。

注意

It should be kept in mind that measure_projectionmeasure_projectionMeasureProjectionMeasureProjectionMeasureProjectionmeasure_projection ignores the domain of ImageImageImageImageimageimage 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.

执行信息

• 多线程类型：可重入（与非独占算子并行运行）。
• 多线程作用域：全局（可从任何线程调用）。
• 未采用并行化处理。

参数

结果

如果参数值正确，算子 measure_projectionmeasure_projectionMeasureProjectionMeasureProjectionMeasureProjectionmeasure_projection 返回值 2 ( H_MSG_TRUE )。否则将抛出异常。

可能的前趋

gen_measure_rectangle2gen_measure_rectangle2GenMeasureRectangle2GenMeasureRectangle2GenMeasureRectangle2gen_measure_rectangle2

可能的后继

close_measureclose_measureCloseMeasureCloseMeasureCloseMeasureclose_measure

替代

gray_projectionsgray_projectionsGrayProjectionsGrayProjectionsGrayProjectionsgray_projections

模块

一维计量