The CAPTCHA: Perspectives and Challenges by Darko Brodić & Alessia Amelio

Author:Darko Brodić & Alessia Amelio
Language: eng
Format: epub
ISBN: 9783030293451
Publisher: Springer International Publishing

Figure 8.7 reports another sample of image-based CAPTCHA where rotation is applied on the visualized images. In particular, image D and T are clearly rotated along the left direction. The user has the aim to recognize and categorize the images visualized on the panel, in order to find the images of the food, the boat and the train.

Fig. 8.7Another sample of image-based CAPTCHA where rotation is applied on some of the visualized images

Other three important techniques for designing robust image-based CAPTCHAs and not linked with the color and geometric image transformations have been used in the literature:Variable and large domain of images,

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