Patent ID: 9619642
Date: 2017-04-11
CPC Classifications: G06F

Claim:
1. A method for generating, by a processor, an image for use in a test to tell computers and humans apart comprising: receiving, by the processor, a selection of a range of characters corresponding to code points from Unicode plane 0, the selected range of characters at least including the 8-bit ASCII character range; receiving, by the processor, a selection of a font for the selected range of characters; testing, by the processor, each character in the selected range of characters, characters of the selected range of characters that pass the testing forming a challenge character subset, the testing comprising: receiving, by the processor, a selection of a number of challenge characters; generating, in response to receiving a request for an image, by the processor: calculating, by the processor, a solution threshold, the solution threshold being a value based on the selected font size of each of the characters in the challenge included in the response and a predetermined distance from the locations of each of the characters in the challenge included in the response.