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approx_chain_simpleT_approx_chain_simpleApproxChainSimpleApproxChainSimpleapprox_chain_simple (Operator)

approx_chain_simpleT_approx_chain_simpleApproxChainSimpleApproxChainSimpleapprox_chain_simple — Approximate a contour by arcs and lines.

Warning

approx_chain_simpleapprox_chain_simpleApproxChainSimpleApproxChainSimpleapprox_chain_simple is obsolete and is only provided for reasons of backward compatibility.

Signature

approx_chain_simple( : : Row, Column : ArcCenterRow, ArcCenterCol, ArcAngle, ArcBeginRow, ArcBeginCol, LineBeginRow, LineBeginCol, LineEndRow, LineEndCol, Order)

Herror T_approx_chain_simple(const Htuple Row, const Htuple Column, Htuple* ArcCenterRow, Htuple* ArcCenterCol, Htuple* ArcAngle, Htuple* ArcBeginRow, Htuple* ArcBeginCol, Htuple* LineBeginRow, Htuple* LineBeginCol, Htuple* LineEndRow, Htuple* LineEndCol, Htuple* Order)

void ApproxChainSimple(const HTuple& Row, const HTuple& Column, HTuple* ArcCenterRow, HTuple* ArcCenterCol, HTuple* ArcAngle, HTuple* ArcBeginRow, HTuple* ArcBeginCol, HTuple* LineBeginRow, HTuple* LineBeginCol, HTuple* LineEndRow, HTuple* LineEndCol, HTuple* Order)

static void HMisc::ApproxChainSimple(const HTuple& Row, const HTuple& Column, HTuple* ArcCenterRow, HTuple* ArcCenterCol, HTuple* ArcAngle, HTuple* ArcBeginRow, HTuple* ArcBeginCol, HTuple* LineBeginRow, HTuple* LineBeginCol, HTuple* LineEndRow, HTuple* LineEndCol, HTuple* Order)

static void HOperatorSet.ApproxChainSimple(HTuple row, HTuple column, out HTuple arcCenterRow, out HTuple arcCenterCol, out HTuple arcAngle, out HTuple arcBeginRow, out HTuple arcBeginCol, out HTuple lineBeginRow, out HTuple lineBeginCol, out HTuple lineEndRow, out HTuple lineEndCol, out HTuple order)

static void HMisc.ApproxChainSimple(HTuple row, HTuple column, out HTuple arcCenterRow, out HTuple arcCenterCol, out HTuple arcAngle, out HTuple arcBeginRow, out HTuple arcBeginCol, out HTuple lineBeginRow, out HTuple lineBeginCol, out HTuple lineEndRow, out HTuple lineEndCol, out HTuple order)

def approx_chain_simple(row: Sequence[int], column: Sequence[int]) -> Tuple[Sequence[int], Sequence[int], Sequence[float], Sequence[int], Sequence[int], Sequence[int], Sequence[int], Sequence[int], Sequence[int], Sequence[int]]

Description

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_simpleApproxChainSimpleApproxChainSimpleapprox_chain_simple behaves similarly as approx_chainapprox_chainApproxChainApproxChainapprox_chain except that in the case of approx_chain_simpleapprox_chain_simpleApproxChainSimpleApproxChainSimpleapprox_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.

Execution Information

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

Parameters

RowRowRowrowrow (input_control)  point.y-array → HTupleSequence[int]HTupleHtuple (integer) (int / long) (Hlong) (Hlong)

Row of the contour.

Default: 32

ColumnColumnColumncolumncolumn (input_control)  point.x-array → HTupleSequence[int]HTupleHtuple (integer) (int / long) (Hlong) (Hlong)

Column of the contour.

Default: 32

ArcCenterRowArcCenterRowArcCenterRowarcCenterRowarc_center_row (output_control)  arc.center.y-array → HTupleSequence[int]HTupleHtuple (integer) (int / long) (Hlong) (Hlong)

Row of the center of an arc.

ArcCenterColArcCenterColArcCenterColarcCenterColarc_center_col (output_control)  arc.center.x-array → HTupleSequence[int]HTupleHtuple (integer) (int / long) (Hlong) (Hlong)

Column of the center of an arc.

ArcAngleArcAngleArcAnglearcAnglearc_angle (output_control)  arc.angle.rad-array → HTupleSequence[float]HTupleHtuple (real) (double) (double) (double)

Angle of an arc.

ArcBeginRowArcBeginRowArcBeginRowarcBeginRowarc_begin_row (output_control)  arc.begin.y-array → HTupleSequence[int]HTupleHtuple (integer) (int / long) (Hlong) (Hlong)

Row of the starting point of an arc.

ArcBeginColArcBeginColArcBeginColarcBeginColarc_begin_col (output_control)  arc.begin.x-array → HTupleSequence[int]HTupleHtuple (integer) (int / long) (Hlong) (Hlong)

Column of the starting point of an arc.

LineBeginRowLineBeginRowLineBeginRowlineBeginRowline_begin_row (output_control)  line.begin.y-array → HTupleSequence[int]HTupleHtuple (integer) (int / long) (Hlong) (Hlong)

Row of the starting point of a line segment.

LineBeginColLineBeginColLineBeginCollineBeginColline_begin_col (output_control)  line.begin.x-array → HTupleSequence[int]HTupleHtuple (integer) (int / long) (Hlong) (Hlong)

Column of the starting point of a line segment.

LineEndRowLineEndRowLineEndRowlineEndRowline_end_row (output_control)  line.end.y-array → HTupleSequence[int]HTupleHtuple (integer) (int / long) (Hlong) (Hlong)

Row of the ending point of a line segment.

LineEndColLineEndColLineEndCollineEndColline_end_col (output_control)  line.end.x-array → HTupleSequence[int]HTupleHtuple (integer) (int / long) (Hlong) (Hlong)

Column of the ending point of a line segment.

OrderOrderOrderorderorder (output_control)  integer-array → HTupleSequence[int]HTupleHtuple (integer) (int / long) (Hlong) (Hlong)

Sequence of line (value 0) and arc segments (value 1).

Example (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);

Result

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

Possible Predecessors

sobel_ampsobel_ampSobelAmpSobelAmpsobel_amp, edges_imageedges_imageEdgesImageEdgesImageedges_image, get_region_contourget_region_contourGetRegionContourGetRegionContourget_region_contour, thresholdthresholdThresholdThresholdthreshold, hysteresis_thresholdhysteresis_thresholdHysteresisThresholdHysteresisThresholdhysteresis_threshold

Possible Successors

set_line_widthset_line_widthSetLineWidthSetLineWidthset_line_width, disp_arcdisp_arcDispArcDispArcdisp_arc, disp_linedisp_lineDispLineDispLinedisp_line

Alternatives

get_region_polygonget_region_polygonGetRegionPolygonGetRegionPolygonget_region_polygon, approx_chainapprox_chainApproxChainApproxChainapprox_chain

See also

get_region_chainget_region_chainGetRegionChainGetRegionChainget_region_chain, smallest_circlesmallest_circleSmallestCircleSmallestCirclesmallest_circle, disp_circledisp_circleDispCircleDispCircledisp_circle, disp_linedisp_lineDispLineDispLinedisp_line

Module

Foundation

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