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106
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ISW
2004
Springer
15 years 6 months ago
2004
Springer
CAPTCHAs are tests that distinguish humans from software robots in an online environment [3, 14, 7]. We propose and implement three CAPTCHAs based on naming images, distinguishing ...
IBPRIA
2007
Springer
15 years 7 months ago
2007
Springer
72
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IBPRIA
2007
Springer
15 years 7 months ago
2007
Springer
61
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IBPRIA
2007
Springer
15 years 7 months ago
2007
Springer
92
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ICPR
2008
IEEE
15 years 7 months ago
2008
IEEE
Most successful object recognition systems are based on a visual alphabet of quantised gradient orientations. Here, we introduce two richer image feature alphabets for use in obje...