approx_chain_simpleT_approx_chain_simpleApproxChainSimpleApproxChainSimpleapprox_chain_simple (算子名称)

名称

approx_chain_simpleT_approx_chain_simpleApproxChainSimpleApproxChainSimpleapprox_chain_simple — Approximate a contour by arcs and lines.

Warning

approx_chain_simpleapprox_chain_simpleApproxChainSimpleApproxChainSimpleApproxChainSimpleapprox_chain_simple is obsolete and is only provided for reasons of backward compatibility.

参数签名

描述

The contour of a curve is approximated by a sequence of lines and arcs.

The result of the procedure is returned separately as arcs and lines. If one is interested in the sequence of the segments the individual resulting elements can be read successively from the resulting tuples. The sequence can be taken from the return parameter order (0: next element is next line segment, 1: next element is next arc segment).

The operator approx_chain_simpleapprox_chain_simpleApproxChainSimpleApproxChainSimpleApproxChainSimpleapprox_chain_simple behaves similarly as approx_chainapprox_chainApproxChainApproxChainApproxChainapprox_chain except that in the case of approx_chain_simpleapprox_chain_simpleApproxChainSimpleApproxChainSimpleApproxChainSimpleapprox_chain_simple the missing parameters are internally allocated as follows: MinWidthCoord = 1.0, MaxWidthCoord = 3.0, ThreshStart = 0.5, ThreshEnd = 0.9, ThreshStep = 0.3, MinWidthSmooth = 1.0, MaxWidthSmooth = 3.0, MinWidthCurve = 2, MaxWidthCurve = 9, Weight1 = 1.0, Weight2 = 1.0, Weight3 = 1.0.

运行信息

• Multithreading type: reentrant (runs in parallel with non-exclusive operators).
• Multithreading scope: global (may be called from any thread).
• Processed without parallelization.

参数表

例程 (C)

/* read edge image */
read_image(&Image,"fig1_kan");
/* construct edge region */
hysteresis_threshold(Image,&RK1,64,255,40,1);
connection(RK1,&Rand);
/* fetch chain code */
T_get_region_contour(Rand,&Rows,&Columns);
firstline = get_i(Tline,0);
firstcol = get_i(Tcol,0);
/* approximation with lines and circular arcs */
T_approx_chain_simple(Rows,Columns,
                &Bzl,&Bzc,&Br,&Bwl,&Bwc,&Ll0,&Lc0,&Ll1,&Lc1,&order);
nob = length_tuple(Bzl);
nol = length_tuple(Ll0);
/* draw lines and arcs */
set_i(WindowHandleTuple,WindowHandle,0);
set_line_width(WindowHandle,4);
if (nob>0) T_disp_arc(Bzl,Bzc,Br,Bwl,Bwc);
set_line_width(WindowHandle,1);
if (nol>0) T_disp_line(WindowHandleTuple,Ll0,Lc0,Ll1,Lc1);

结果

The operator approx_chain_simpleapprox_chain_simpleApproxChainSimpleApproxChainSimpleApproxChainSimpleapprox_chain_simple returns the value 2 ( H_MSG_TRUE) if the parameters are correct. Otherwise an exception is raised.

可能的前置算子

sobel_ampsobel_ampSobelAmpSobelAmpSobelAmpsobel_amp, edges_imageedges_imageEdgesImageEdgesImageEdgesImageedges_image, get_region_contourget_region_contourGetRegionContourGetRegionContourGetRegionContourget_region_contour, thresholdthresholdThresholdThresholdThresholdthreshold, hysteresis_thresholdhysteresis_thresholdHysteresisThresholdHysteresisThresholdHysteresisThresholdhysteresis_threshold

可能的后置算子

set_line_widthset_line_widthSetLineWidthSetLineWidthSetLineWidthset_line_width, disp_arcdisp_arcDispArcDispArcDispArcdisp_arc, disp_linedisp_lineDispLineDispLineDispLinedisp_line

可替代算子

get_region_polygonget_region_polygonGetRegionPolygonGetRegionPolygonGetRegionPolygonget_region_polygon, approx_chainapprox_chainApproxChainApproxChainApproxChainapprox_chain

参考其它

get_region_chainget_region_chainGetRegionChainGetRegionChainGetRegionChainget_region_chain, smallest_circlesmallest_circleSmallestCircleSmallestCircleSmallestCirclesmallest_circle, disp_circledisp_circleDispCircleDispCircleDispCircledisp_circle, disp_linedisp_lineDispLineDispLineDispLinedisp_line

模块

Foundation

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