CAPT OF A B727 TOOK OFF WHEN THE WX WAS RPTED BELOW TKOF MINIMUMS FOR THE RWY USED.

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UPON ARR AT THE ARPT WE NOTED A GND FOG CONDITION WHICH I ESTIMATED VISIBILITY TO BE APPROX 1/2 TO 1/4 MI. AFTER FLT PLANNING AND ARR AT THE ACFT I CHKED THE COMMERCIAL CHARTS AND DETERMINED THAT AUSTIN; TX; TKOF CAPABILITY WAS 600/600/600 RVR ON THE MOST CAPABLE RWY (ACTUALLY RWY 17L). AT THAT TIME I NOTICED 2 ACFT (B737'S) TAXIING TO TKOF ON RWY 17R. WE WERE SUBSEQUENTLY GIVEN TAXI INSTRUCTIONS TO RWY 17R. AT THIS TIME I WAS THINKING THAT RWY 17R MUST BE THE MOST CAPABLE RWY AND IT DIDN'T DAWN ON ME THAT I HAD LOOKED AT THE CHART FOR THE WRONG RWY (RWY 17L). WHEN SWITCHING TO TWR THEY ADVISED 1200 FT RVR TOUCHDOWN AND 1400 FT RVR MID-POINT. I WAS THINKING -- NO PROB; THE RWY CAPABILITY HAS 600/600/600 RVR CAPABILITY. WE WERE THEN GIVEN TKOF CLRNC AND UPON LINING UP I NOTICED THAT THERE WERE NO CTRLINE LIGHTS BUT THAT THERE WERE FULL RWY MARKINGS VISIBLE. I ALSO NOTED THAT I COULD SEE RWY 8 EDGE LIGHTS AND IT LOOKED TO BE 1600 FT RVR. MY MIND THEN ASSUMED THAT FOR THE 1200 FT RVR RPTED THAT THE RWY MARKINGS MUST BE AN ADEQUATE SUBSTITUTE FOR THE CTRLINE LIGHTS (WHICH THEY ARE NOT) BUT THAT THE PREVAILING VISIBILITY WOULD ALLOW FOR A LEGAL AND SAFE TKOF; SO THE TKOF WAS CONTINUED UNEVENTFULLY. AS WE CONTINUED DOWN THE RWY THE VISIBILITY IMPROVED EVEN FURTHER TO 10+ LIGHTS (RWY EDGE). AFTER TKOF I HEARD ANOTHER ACR STATE TO THE TWR THAT HE NEEDED 1600 FT RVR FOR TKOF. AT CRUISE I HAD ANOTHER LOOK AT THE TKOF PAGE AND NOTICED THAT I HAD IN FACT LOOKED AT THE WRONG CHART; FOR RWY 17L; AND THAT 1600 FT RVR WAS REQUIRED FOR TKOF ON RWY 17R. I FELT THAT WE IN FACT HAD 1600 FT RVR EVEN THOUGH IT WAS NOT RPTED AS SUCH BY THE TWR. I FEEL THAT THIS WAS AN ERROR COMPOUNDED BY THE FACT THAT OTHER ACFT WERE USING THE SAME RWY FOR TKOF (THEY MAY HAVE HAD BETTER VISIBILITY THAN WHEN WE ARRIVED AT THE TKOF POS); WHICH LULLED ME INTO A SENSE OF SECURITY IN MY ASSESSMENT OF THE SIT. I WILL TAKE MORE TIME TO READ THE TKOF PAGES IN FUTURE SITS.