Date : 12-11-29 14:34
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[Seisunix] Modifications to SU trace rasterizing routines suxwigb 구동시 선이 깨지는문제 해결
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Author :
07 (121.♡.152.151)
 Views : 6,696  recommend : 0
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 su-xwigb.zip (58.2K) [0] DATE : 2012-11-29 14:34:25 |
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[Seisunix] Modifications to SU trace rasterizing routines rfwtva.c and rfwtvaint.c
Inbox x Kris Vanneste kris.vanneste@oma.be via mailman.mines.edu Nov 4 Reply to seisunix Dear John and seisunix list members, Several years ago, I discovered and fixed a bug (or rather incompleteness) in the trace rasterizing routines that are used by xwigb and pswigb. When displaying a wiggle trace, you don't always get a continuous line. This problem appears when the number of rasterized samples exceeds the number of bits in the x direction (time axis), and disappears when you zoom in far enough. The attached images suxwigb1_old.png and suxwigb2_old.png illustrate this problem for two different traces. I modified the rasterizing routines in the source files rfwtva.c and rfwtvaint.c (located in $CWPROOT/src/cwp/lib), so that bits in the y direction (amplitude axis) are correctly set. Basically, I had to add a loop over the y coordinates that intervene between two subsequent x coordinates. The result of these modifications can be seen in the attached images suxwigb1_new_interp=0.png, suxwigb1_new_interp=1.png and suxwigb2_new.png. Please find attached the modified source files rfwtva.c and rfwtvaint.c. I modified them from SU version 36 (but as far as I can see, these files have not been changed since then). I have marked all modified sections with /* (kvn) */ remarks. I tried to make as little modifications as possible, to make clear what exactly has been changed. I am not an experienced C programmer, so it is possible that the code can be further optimized. However, I have not encountered any problem with my modified code so far. I hope you will consider these modifications for inclusion in next versions of SU. Thank you for your continuing effort to improve Seismic Unix! Kind regards, Kris Vanneste -- |
