1 | |
---|
2 | <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" |
---|
3 | "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> |
---|
4 | |
---|
5 | <!-- Generated by IDLdoc 2.0 --> |
---|
6 | |
---|
7 | <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> |
---|
8 | <head> |
---|
9 | <title>quadrilateral2square.pro (SAXO Documentation)</title> |
---|
10 | |
---|
11 | |
---|
12 | <link rel="stylesheet" type="text/css" media="all" href="./../main_files.css" /> |
---|
13 | <link rel="stylesheet" type="text/css" media="print" href="./../main_files_print.css" /> |
---|
14 | |
---|
15 | |
---|
16 | <script type="text/javascript"> |
---|
17 | function setTitle() { |
---|
18 | parent.document.title="quadrilateral2square.pro (SAXO Documentation)"; |
---|
19 | } |
---|
20 | </script> |
---|
21 | </head> |
---|
22 | |
---|
23 | <body onload="setTitle();"> |
---|
24 | |
---|
25 | <div id="navbar_title"> |
---|
26 | <h1>SAXO Documentation</h1> |
---|
27 | </div> |
---|
28 | |
---|
29 | |
---|
30 | <div id="main_navbar"> |
---|
31 | |
---|
32 | <table cellspacing="0"> |
---|
33 | <tr> |
---|
34 | |
---|
35 | <td><a href="./../overview.html?format=raw" title="Overview of library">Overview</a></td> |
---|
36 | |
---|
37 | |
---|
38 | |
---|
39 | <td >Directory</td> |
---|
40 | |
---|
41 | |
---|
42 | |
---|
43 | <td><a href="./../idldoc-categories.html?format=raw" title="Browse library by category">Categories</a></td> |
---|
44 | |
---|
45 | |
---|
46 | |
---|
47 | <td><a href="./../idldoc-index.html?format=raw" title="Index of files, routines, and parameters">Index</a></td> |
---|
48 | |
---|
49 | |
---|
50 | |
---|
51 | <td><a href="./../search-page.html?format=raw" title="Search library">Search</a></td> |
---|
52 | |
---|
53 | |
---|
54 | <td id="selected">File</td> |
---|
55 | |
---|
56 | |
---|
57 | <td >Source</td> |
---|
58 | |
---|
59 | |
---|
60 | |
---|
61 | <td><a href="./../idldoc-help.html?format=raw" title="Help on IDLdoc">Help</a></td> |
---|
62 | |
---|
63 | |
---|
64 | <td >Etc</td> |
---|
65 | |
---|
66 | <td id="flexible">Developer documentation</td> |
---|
67 | </tr> |
---|
68 | </table> |
---|
69 | |
---|
70 | </div> |
---|
71 | |
---|
72 | <div id="secondary_navbar"> |
---|
73 | |
---|
74 | <a href="neighbor.html"><<prev file</a> | <a href="spl_fstdrv.html">next file >></a> <a href="quadrilateral2square.html" target="_TOP">view single page</a> | <a href="./../index.html?format=raw" target="_TOP">view frames</a> summary: fields | routine details: <a href="#routine_details">routine</a> |
---|
75 | |
---|
76 | </div> |
---|
77 | |
---|
78 | |
---|
79 | <div id="container"> |
---|
80 | |
---|
81 | <h1 class="directory"><a href="directory-overview.html?format=raw">Interpolation/</a></h1> |
---|
82 | <h2 class="pro_file">quadrilateral2square.pro</h2> |
---|
83 | |
---|
84 | <div id="file_attr"> |
---|
85 | <dl> |
---|
86 | </dl> |
---|
87 | </div> |
---|
88 | |
---|
89 | <div id="file_comments"> warm (or map) an arbitrary quadrilateral onto a unit square |
---|
90 | according to the 4-point correspondences: |
---|
91 | (x0,y0) -> (0,0) |
---|
92 | (x1,y1) -> (1,0) |
---|
93 | (x2,y2) -> (1,1) |
---|
94 | (x3,y3) -> (0,1) |
---|
95 | This is the inverse function of square2quadrilateral.pro |
---|
96 | The mapping is done using perspective transformation which preserve |
---|
97 | lines in all orientations and permit quadrilateral to quadrilateral |
---|
98 | mappings. see ref. bellow. |
---|
99 | </div> |
---|
100 | |
---|
101 | |
---|
102 | |
---|
103 | |
---|
104 | |
---|
105 | |
---|
106 | |
---|
107 | |
---|
108 | |
---|
109 | <div id="routine_details"> |
---|
110 | |
---|
111 | |
---|
112 | <div class="routine_details" id="_quadrilateral2square"> |
---|
113 | |
---|
114 | <h2><a class="top" href="#container">top</a>quadrilateral2square <span class="categories"> image, grid manipulation |
---|
115 | </span></h2> |
---|
116 | |
---|
117 | <p class="header"> |
---|
118 | <span class="result">result = </span>quadrilateral2square(<span class="result"><a href="#_quadrilateral2square_param_x0in">x0in</a>, <a href="#_quadrilateral2square_param_y0in">y0in</a>, <a href="#_quadrilateral2square_param_x1in">x1in</a>, <a href="#_quadrilateral2square_param_y1in">y1in</a>, <a href="#_quadrilateral2square_param_x2in">x2in</a>, <a href="#_quadrilateral2square_param_y2in">y2in</a>, <a href="#_quadrilateral2square_param_x3in">x3in</a>, <a href="#_quadrilateral2square_param_y3in">y3in</a>, <a href="#_quadrilateral2square_param_xxin">xxin</a>, <a href="#_quadrilateral2square_param_yyin">yyin</a></span>, <a href="#_quadrilateral2square_keyword_PERF">PERF</a>=<span class="result">PERF</span>)</p> |
---|
119 | |
---|
120 | <div class="comments"> |
---|
121 | </div> |
---|
122 | |
---|
123 | <h3>Return value</h3><div class="value"> |
---|
124 | |
---|
125 | (2,n) array: the new coodinates (xout, yout) of the (xin,yin) |
---|
126 | point(s) after mapping. |
---|
127 | If xin is a scalar, then n is equal to the number of elements of |
---|
128 | x0. If xin is an array , then n is equal to the number of |
---|
129 | elements of xin. |
---|
130 | </div> |
---|
131 | |
---|
132 | |
---|
133 | <h3>Parameters</h3> |
---|
134 | |
---|
135 | |
---|
136 | <h4 id="_quadrilateral2square_param_x0in">x0in |
---|
137 | <span class="attr">in</span> |
---|
138 | |
---|
139 | |
---|
140 | <span class="attr">required</span> |
---|
141 | |
---|
142 | |
---|
143 | |
---|
144 | |
---|
145 | </h4> |
---|
146 | |
---|
147 | <div class="comments"> the coordinates of the quadrilateral</div> |
---|
148 | |
---|
149 | <h4 id="_quadrilateral2square_param_y0in">y0in |
---|
150 | <span class="attr">in</span> |
---|
151 | |
---|
152 | |
---|
153 | <span class="attr">required</span> |
---|
154 | |
---|
155 | |
---|
156 | |
---|
157 | |
---|
158 | </h4> |
---|
159 | |
---|
160 | <div class="comments"> the coordinates of the quadrilateral</div> |
---|
161 | |
---|
162 | <h4 id="_quadrilateral2square_param_x1in">x1in |
---|
163 | <span class="attr">in</span> |
---|
164 | |
---|
165 | |
---|
166 | <span class="attr">required</span> |
---|
167 | |
---|
168 | |
---|
169 | |
---|
170 | |
---|
171 | </h4> |
---|
172 | |
---|
173 | <div class="comments"> the coordinates of the quadrilateral</div> |
---|
174 | |
---|
175 | <h4 id="_quadrilateral2square_param_y1in">y1in |
---|
176 | <span class="attr">in</span> |
---|
177 | |
---|
178 | |
---|
179 | <span class="attr">required</span> |
---|
180 | |
---|
181 | |
---|
182 | |
---|
183 | |
---|
184 | </h4> |
---|
185 | |
---|
186 | <div class="comments"> the coordinates of the quadrilateral</div> |
---|
187 | |
---|
188 | <h4 id="_quadrilateral2square_param_x2in">x2in |
---|
189 | <span class="attr">in</span> |
---|
190 | |
---|
191 | |
---|
192 | <span class="attr">required</span> |
---|
193 | |
---|
194 | |
---|
195 | |
---|
196 | |
---|
197 | </h4> |
---|
198 | |
---|
199 | <div class="comments"> the coordinates of the quadrilateral</div> |
---|
200 | |
---|
201 | <h4 id="_quadrilateral2square_param_y2in">y2in |
---|
202 | <span class="attr">in</span> |
---|
203 | |
---|
204 | |
---|
205 | <span class="attr">required</span> |
---|
206 | |
---|
207 | |
---|
208 | |
---|
209 | |
---|
210 | </h4> |
---|
211 | |
---|
212 | <div class="comments"> the coordinates of the quadrilateral</div> |
---|
213 | |
---|
214 | <h4 id="_quadrilateral2square_param_x3in">x3in |
---|
215 | <span class="attr">in</span> |
---|
216 | |
---|
217 | |
---|
218 | <span class="attr">required</span> |
---|
219 | |
---|
220 | |
---|
221 | |
---|
222 | |
---|
223 | </h4> |
---|
224 | |
---|
225 | <div class="comments"> the coordinates of the quadrilateral</div> |
---|
226 | |
---|
227 | <h4 id="_quadrilateral2square_param_y3in">y3in |
---|
228 | <span class="attr">in</span> |
---|
229 | |
---|
230 | |
---|
231 | <span class="attr">required</span> |
---|
232 | |
---|
233 | |
---|
234 | |
---|
235 | |
---|
236 | </h4> |
---|
237 | |
---|
238 | <div class="comments"> the coordinates of the quadrilateral |
---|
239 | (see above for correspondance with the unit square). Can be |
---|
240 | scalar or array. (x0,y0), (x1,y1), (x2,y2) and (x3,y3) are |
---|
241 | given in the anticlockwise order. |
---|
242 | </div> |
---|
243 | |
---|
244 | <h4 id="_quadrilateral2square_param_xxin">xxin |
---|
245 | <span class="attr">in</span> |
---|
246 | |
---|
247 | |
---|
248 | <span class="attr">required</span> |
---|
249 | |
---|
250 | |
---|
251 | |
---|
252 | |
---|
253 | </h4> |
---|
254 | |
---|
255 | <div class="comments"> the coordinates of the point(s) for which we want to do the |
---|
256 | mapping. Can be scalar or array.</div> |
---|
257 | |
---|
258 | <h4 id="_quadrilateral2square_param_yyin">yyin |
---|
259 | <span class="attr">in</span> |
---|
260 | |
---|
261 | |
---|
262 | <span class="attr">required</span> |
---|
263 | |
---|
264 | |
---|
265 | |
---|
266 | |
---|
267 | </h4> |
---|
268 | |
---|
269 | <div class="comments"> the coordinates of the point(s) for which we want to do the |
---|
270 | mapping. Can be scalar or array. |
---|
271 | </div> |
---|
272 | |
---|
273 | |
---|
274 | |
---|
275 | |
---|
276 | |
---|
277 | |
---|
278 | <h3>Keywords</h3> |
---|
279 | |
---|
280 | <h4 id="_quadrilateral2square_keyword_PERF">PERF |
---|
281 | |
---|
282 | |
---|
283 | |
---|
284 | |
---|
285 | |
---|
286 | |
---|
287 | |
---|
288 | |
---|
289 | </h4> |
---|
290 | |
---|
291 | <div class="comments"></div> |
---|
292 | |
---|
293 | |
---|
294 | |
---|
295 | <h3>Examples</h3><div class="value"> |
---|
296 | |
---|
297 | res = square2quadrilateral(x0,y0,x1,y1,x2,y2,x3,y3,xin,yin) |
---|
298 | |
---|
299 | |
---|
300 | |
---|
301 | IDL> splot,[0,5],[0,3],/nodata,xstyle=1,ystyle=1 |
---|
302 | IDL> tracegrille, findgen(11)*.1, findgen(11)*.1,color=indgen(12)*20 |
---|
303 | IDL> xin = (findgen(11)*.1)#replicate(1, 11) |
---|
304 | IDL> yin = replicate(1, 11)#(findgen(11)*.1) |
---|
305 | IDL> out = square2quadrilateral(2,1,3,0,5,1,2,3, xin, yin) |
---|
306 | IDL> tracegrille, reform(out[0,*],11,11), reform(out[1,*],11,11),color=indgen(12)*20 |
---|
307 | |
---|
308 | IDL> inorg=quadrilateral2square(2,1,3,0,5,1,2,3,out[0,*],out[1,*]) |
---|
309 | IDL> tracegrille, reform(inorg[0,*],11,11), reform(inorg[1,*],11,11),color=indgen(12)*20 |
---|
310 | </div> |
---|
311 | <h3>Version history</h3> |
---|
312 | |
---|
313 | |
---|
314 | <h4>History</h4><div class="value"> |
---|
315 | Sebastien Masson (smasson@lodyc.jussieu.fr) |
---|
316 | August 2003 |
---|
317 | Based on "Digital Image Warping" by G. Wolberg |
---|
318 | IEEE Computer Society Press, Los Alamitos, California |
---|
319 | Chapter 3, see p 52-56 |
---|
320 | </div> |
---|
321 | |
---|
322 | |
---|
323 | <h3>Known issues</h3> |
---|
324 | |
---|
325 | |
---|
326 | |
---|
327 | <h4>Restrictions</h4><div class="value"> I think degenerated quadrilateral (e.g. flat of |
---|
328 | twisted) is not work. This has to be tested. |
---|
329 | </div> |
---|
330 | |
---|
331 | |
---|
332 | |
---|
333 | |
---|
334 | |
---|
335 | |
---|
336 | |
---|
337 | |
---|
338 | |
---|
339 | |
---|
340 | |
---|
341 | </div> |
---|
342 | |
---|
343 | </div> |
---|
344 | |
---|
345 | |
---|
346 | |
---|
347 | <div id="tagline">Produced by IDLdoc 2.0.</div> |
---|
348 | |
---|
349 | </div> |
---|
350 | |
---|
351 | </body> |
---|
352 | </html> |
---|