A Novel Image Selection Based Captcha Scheme

Captcha is a popular real user detection or technical autobot / robot used on websites for Desktops rejection. Captcha is also being used in some mobile websites. Captcha difficult to read on your smartphone and laptop screens. Users trapped zoom in / zoom out to read and fill out the captcha and other required fields. User's old elderly are more difficult to see and enter the Captcha. Therefore, there is a strong need for imaging techniques based image code as easy to detect the actual users and to prevent tools autobot / robot, which are used to exploit the website databases. In this research have proposed a alternative / visual graph for captcha. In this research, we are proposing the development of a new technique captcha as facilitating the user to enter a code graphic image instead of captcha text based. Users will see a complete picture and a piece of the image (sub-image) the. User will have to tap the image area, which coincides with the piece (sub-image). In addition, the system will crop the image of that particular area of a particular size, which will then be sent to the server for authentication real user. Server side corresponds to the piece with the cropped image (which is a user input). If chunk corresponds to the cropped image, the user will be marked a real user, otherwise a new code similar image will be sent to the user for re-authentication.