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75 lines
3.2 KiB
C
75 lines
3.2 KiB
C
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/**********************************************************************
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* File: scanedg.h (Formerly scanedge.h)
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* Description: Raster scanning crack based edge extractor.
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* Author: Ray Smith
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* Created: Fri Mar 22 16:11:50 GMT 1991
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*
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* (C) Copyright 1991, Hewlett-Packard Ltd.
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** Licensed under the Apache License, Version 2.0 (the "License");
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** you may not use this file except in compliance with the License.
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** You may obtain a copy of the License at
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** http://www.apache.org/licenses/LICENSE-2.0
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** Unless required by applicable law or agreed to in writing, software
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** distributed under the License is distributed on an "AS IS" BASIS,
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** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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** See the License for the specific language governing permissions and
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** limitations under the License.
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*
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**********************************************************************/
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#ifndef SCANEDG_H
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#define SCANEDG_H
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#include "varable.h"
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#include "grphics.h"
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#include "img.h"
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#include "pdblock.h"
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#include "crakedge.h"
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DLLSYM void block_edges( //get edges in a block
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IMAGE *t_image, //threshold image
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PDBLK *block, //block in image
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ICOORD page_tr //corner of page
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);
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void make_margins( //get a line
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PDBLK *block, //block in image
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BLOCK_LINE_IT *line_it, //for old style
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UINT8 *pixels, //pixels to strip
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UINT8 margin, //white-out pixel
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INT16 left, //block edges
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INT16 right,
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INT16 y //line coord
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);
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void whiteout_block( //clean it
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IMAGE *t_image, //threshold image
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PDBLK *block //block in image
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);
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void line_edges ( //scan for edges
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INT16 x, //coord of line start
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INT16 y, //coord of line
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INT16 xext, //width of line
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UINT8 uppercolour, //start of prev line
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UINT8 * bwpos, //thresholded line
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CRACKEDGE ** prevline //edges in progress
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);
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CRACKEDGE *h_edge ( //horizontal edge
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INT16 x, //xposition
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INT16 y, //y position
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INT8 sign, //sign of edge
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CRACKEDGE * join //edge to join to
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);
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CRACKEDGE *v_edge ( //vertical edge
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INT16 x, //xposition
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INT16 y, //y position
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INT8 sign, //sign of edge
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CRACKEDGE * join //edge to join to
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);
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void join_edges( //join edge fragments
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CRACKEDGE *edge1, //edges to join
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CRACKEDGE *edge2 //no specific order
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);
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void free_crackedges( //really free them
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CRACKEDGE *start //start of loop
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);
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#endif
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