Verifying human interaction via rotated images

A computer-implemented method, comprising:

• at a server having one or more processors and memory storing one or more programs executed by the one or more processors:
• selecting a candidate image from an unscreened image repository;
• performing an image orientation detection test on the candidate image using an automated image orientation analyzer and determining that the test is passed when either the automated image orientation analyzer incorrectly identifies the orientation of the image, or the automated image orientation analyzer correctly identifies the orientation of the image but at a confidence level that is below a predefined threshold;
• if the candidate image passes the test, including the candidate image in a plurality of challenges;
• logging numbers of correct and incorrect identifications of the candidate image in responses to the plurality of challenges;
• and
• if the numbers of correct and incorrect identifications for the candidate image satisfy predefined criteria, adding the candidate image to a screened image repository.

A system, comprising:

• memory;
• one or more processors;
• and
• one or more modules stored in the memory and configured for execution by the one or more processors, the one or more modules comprising:
• instructions to receive a request to access the system from a client device;
• instructions to, in response to the request, generate a challenge, including:
• instructions to select a plurality of distinct images;
• and
• instructions to modify orientations of a subset of the selected plurality of images;
• the challenge comprising the plurality of images, including the subset of the selected plurality of images having modified orientations, and a question concerning orientations of the selected plurality of images, including the subset of the selected plurality of images having modified orientations;
• instructions to transmit the challenge to the client device for display;
• instructions to receive a response to the question from the client device;
• and
• instructions to grant the request if the response correctly answers the question.

A non-transitory computer readable storage medium storing one or more programs for execution by one or more processors of a computer system, the one or more programs comprising instructions for:

• receiving an access request from a client device;
• in response to the access request, generating a challenge, including:
• selecting a plurality of distinct images;
• and
• modifying orientations of a subset of the selected plurality of images;
• the challenge comprising the selected plurality of images, including the subset of the selected plurality of images having modified orientations, and a question concerning orientations of the selected plurality of images, including the subset of the selected plurality of images having modified orientations;
• transmitting the challenge to the client device for display;
• receiving a response to the question from the client device;
• and
• granting the access request if the response correctly answers the question.

A system, comprising:

• memory;
• one or more processors;
• and
• one or more modules stored in the memory and configured for execution by the one or more processors, the one or more modules comprising:
• instructions to select a candidate image from an unscreened image repository;
• instructions to perform an image orientation detection test on the candidate image using an automated image orientation analyzer and determining that the test is passed when either the automated image orientation analyzer incorrectly identifies the orientation of the image, or the automated image orientation analyzer correctly identifies the orientation of the image but at a confidence level that is below a predefined threshold;
• instructions to, if the candidate image passes the test, include the candidate image in a plurality of challenges;
• instructions to log numbers of correct and incorrect identifications of the candidate image in responses to the plurality of challenges;
• and
• instructions to, if the numbers of correct and incorrect identifications for the candidate image satisfy predefined criteria, add the candidate image to a screened image repository.

A non-transitory computer readable storage medium storing one or more programs for execution by one or more processors of a computer system, the one or more programs comprising instructions for:

• selecting a candidate image from an unscreened image repository;
• performing an image orientation detection test on the candidate image using an automated image orientation analyzer and determining that the test is passed when either the automated image orientation analyzer incorrectly identifies the orientation of the image, or the automated image orientation analyzer correctly identifies the orientation of the image but at a confidence level that is below a predefined threshold;
• if the candidate image passes the test, including the candidate image in a plurality of challenges;
• logging numbers of correct and incorrect identifications of the candidate image in responses to the plurality of challenges;
• and
• if the numbers of correct and incorrect identifications for the candidate image satisfy predefined criteria, adding the candidate image to a screened image repository.