several semantic image search schemes have been recently proposed to retrieve images from the web. however, the query context is regularly ignored in these techniques and hence, many of the returned images are not adequately relevant. in this paper, we make use of context to further confine the outcome of the semantic search engines. for this purpose, we propose a hybrid search engine which uti...

Semantic Image Synthesis (SIS) is a subclass of I2I (I2) translation where photorealistic image synthesized from segmentation mask. SIS has mainly been addressed as supervised problem. However, state-of-the-art methods depend on massive amount labeled data and cannot be applied in an unpaired setting. On the other hand, generic frameworks underperform comparison. In this work, we propose new fr...

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With the growing and prevalent usage of Internet, threat for the service providers has arisen. One of the most important aspects of modern security concerns is to deal with users that are computer programs or bots. These programs pretend to be human users and exploit servers by submitting data automatically, thereby, hindering the services of the server. Security mechanism dealing with such att...

The multimedia research community has, for long, attempted to recognize generic images, make them searchable by content, annotate them, and associate them with linguistic indexes. In the course of these attempts, the limitations of state-of-the-art algorithms in mimicking human vision has become wellknown. In this paper, we explore the exploitation of this limitation for solving a security prob...

Artificial Immune Systems (AIS) can be defined as soft computing systems inspired by immune system of vertebrates. Immune system is an adaptive pattern recognition system. AIS have been used in pattern recognition, machine learning, optimization and clustering. Feature reduction refers to the problem of selecting those input features that are most predictive of a given outcome; a problem encoun...

Visual cryptography (VC) technique encodes an image into two or more shares that appear random in human eyes. In the decryption section, pixels shared images are combined to obtain information contained original image. This study applies visual cryptographic techniques graysle and color for user authentication online transactions using VC2,2 scheme. The server computer CAPTCHA sent through diff...