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Captcha from rapidshare.de is the easiest,
No need to rotate the letters, no need to filter the background and no need to convert to gray scale. The best thing to do is to leave it as it is.
Letters always have different colors so if we find a different color it's a different letter. If there is a captcha that has 2 letters of same color, next letter can be found after matching the pattern for the re-scaled image. We re-scale it to a 8x8 matrix
01110000
01001100
11001100
11000100
11000100
11001100
11001100
11111000
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10000110
10000110
11011110
11011010
01011110
01111110
00110110
00110110
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01111100
11101100
11000000
11000000
11000000
11000000
11000000
01111000
| | D | W | C |
The format of this captcha is .png and it can't be loaded using IPicture interface, so it needs to be converted to a different format.
Test results for current version of captcha.dll using 100 downloaded captchas:
| !1C7.BMP -> 1C7 |
| !1OW.BMP -> 1OW |
| !1UB.BMP -> 1UB |
| !1ZW.BMP -> 1ZW |
| !2GV.BMP -> 2GV |
| !2TS.bmp -> 2TS |
| !2ZG.BMP -> 2ZG |
| !356.BMP -> 356 |
| !38W.BMP -> 38W |
| !3OP.BMP -> 3OP |
| !3UI.bmp -> 3UI |
| !3ZG.bmp -> 3ZG |
| !457.BMP -> 457 |
| !4GJ.BMP -> 4GJ |
| !4LI.bmp -> 4LI |
| !4XF.bmp -> 4XF |
| !5L1.BMP -> 5L1 |
| !5TE.bmp -> 5TE |
| !62T.BMP -> 62T |
| !6MI.BMP -> 6MI |
| F | !6NO.bmp -> 6ND |
| !6NX.bmp -> 6NX |
| !76B.BMP -> 76B |
| !7DA.BMP -> 7DA |
| !7I9.BMP -> 7I9 |
| !86H.BMP -> 86H |
| !87R.BMP -> 87R |
| !8JP.BMP -> 8JP |
| !8OX.BMP -> 8OX |
| !935.bmp -> 935 |
| !994.BMP -> 994 |
| !A7I.BMP -> A7I |
| F | !AS.BMP -> ASJ |
| !BD2.BMP -> BD2 |
| !BMT.bmp -> BMT |
| !BOR.BMP -> BOR |
| !CY7.BMP -> CY7 |
| !CZC.BMP -> CZC |
| !CZU.bmp -> CZU |
| !D9K.bmp -> D9K |
| !DBS.bmp -> DBS |
| !DP1.BMP -> DP1 |
| !DPV.BMP -> DPV |
| !DWC.BMP -> DWC |
| !DY1.bmp -> DY1 |
| !EAE.BMP -> EAE |
| !EDV.BMP -> EDV |
| !EW4.bmp -> EW4 |
| !F5U.BMP -> F5U |
| !FJS.BMP -> FJS |
| !GFU.BMP -> GFU |
| !GNP.BMP -> GNP |
| !GPL.BMP -> GPL |
| F | !GV.bmp -> GVJ |
| !H14.bmp -> H14 |
| !H7G.BMP -> H7G |
| !HA4.BMP -> HA4 |
| !HNC.bmp -> HNC |
| !HYD.BMP -> HYD |
| !JLM.BMP -> JLM |
| !JTU.BMP -> JTU |
| !KC3.BMP -> KC3 |
| !KCA.bmp -> KCA |
| !KD3.BMP -> KD3 |
| !KL5.BMP -> KL5 |
| !KUL.bmp -> KUL |
| !L82.bmp -> L82 |
| !LG5.BMP -> LG5 |
| !LOL.BMP -> LOL |
| !LOO.bmp -> LOO |
| !LRA.bmp -> LRA |
| !MMS.BMP -> MMS |
| !N5T.BMP -> N5T |
| !NC1.BMP -> NC1 |
| !NDT.BMP -> NDT |
| !NL4.BMP -> NL4 |
| !NYT.BMP -> NYT |
| !O77.BMP -> O77 |
| !O8T.BMP -> O8T |
| !O99.BMP -> O99 |
| !OY5.BMP -> OY5 |
| !PML.BMP -> PML |
| !PS4.BMP -> PS4 |
| !RYY.bmp -> RYY |
| !S33.BMP -> S33 |
| !S3O.BMP -> S3O |
| !SPJ.BMP -> SPJ |
| !SRV.BMP -> SRV |
| !TS8.BMP -> TS8 |
| !TTL.bmp -> TTL |
| !U39.BMP -> U39 |
| !U8U.BMP -> U8U |
| !UDW.BMP -> UDW |
| !V2W.BMP -> V2W |
| !V84.BMP -> V84 |
| !XHJ.BMP -> XHJ |
| !YDC.BMP -> YDC |
| !YU2.BMP -> YU2 |
| !Z68.BMP -> Z68 |
| !ZDG.BMP -> ZDG |
| !ZL9.BMP -> ZL9 |
| !ZR1.BMP -> ZR1 |
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