Towards a realistic marker-based augmented reality scene: issues and prospective aspect

This paper describes the main problems in realistic Augmented Reality scenes. In order to view the real world with additional computer-generated information in a seamless and realistic integration, there are several research challenges that can be identified; some related to camera tracking, system design, user interaction, and rendering. The focus on each of these aspects was thoroughly explored by several methods and techniques. This study is considered to be an exploration for an Augmented Reality rendering technique. This technique focuses on increasing the realism in the AR scene. Thus, in order to realize the AR scene in a more realistic way, there are four main issues; light source detection, well-designed virtual objects that can have true reflex of the real environment, then integration of a real-time accurate soft shadow

A study on image segmentation techniques used in color detection

to humans, an image is a meaningful arrangement of regions and objects, whereas to computers, an image is merely a random collection of pixels. This work exploits some of the techniques based on the extraction of the color of an image in the real-time environment. Image segmentation is an intense research area in Computer Vision, however, enhancements or results still on to produce accurate segmentation results for images. Relating with other surveys that compare multiple techniques, this paper takes the advantage to select of the most used technique(s), Our study may be helpful for Augmented Reality environment, object detection and tracking as well as other real -time technologies. Interested reader will obtain know ledge on various categories and types of research challenges In the image-based segmentation within the scope of colored images environments

Rendering of single scattering using types of light sources : review

In spite of their diverse applications, realistic rendering of light scattering In participating media is still very challenging due to the complexity of the variety radiative transport processes. In this study, we address several types of light models that play important role in realistic images synthesis and determine the advantages and shortcomings of each of them. Our study focus is on the interaction between the light models with particles in the air such as dust, fog, mist, haze, smoke, etc. We seek to provide information to help the reader to select the optimal and suitable light model with numerous of applications in computer graphics

Stylized line drawing and shading effects for cartoon rendering

Due to increasing demands of cartoon style in many areas of computer graphic aspects, this paper presents a simple stylized shading technique to enhance the cartoonish appearance in two aspects. First, a new toon-illumination model is developed to emphasize the boundaries between diffuse reflection part and specular reflection part in the phong illumination model. the new discrete shading will be exploited to convey the light and dark orientations on the surface of 3d model. second, we combine stylized lines with non-photorealistic shading effect to convey more visual cues of tone. the experimental result reveals the ability of proposed model to produce many cartoon effects

Interactive non-photorealistic rendering

Due to increasing demands of artistic style with Interactive Rate, we propose this review paper as a starting point for any person interested in researching of interactive non-photorealistic rendering. As a simple yet effective means of visual communication, interactive non-photorealistic rendering generates images that are closer to human-drawn than are created by traditional computer graphics techniques with more expressing meaningful visual information. This paper presents taxonomy of interactive non-photorealistic rendering techniques which developed over the past two decades, structured according to the design characteristics and behavior of each technique. Also, it covers the most important algorithms in interactive stylized shade and line drawing, and separately discussing their advantages and disadvantages. The review then concludes with a discussion of the main issues and technical challenges for Interactive Non-Photorealistic Rendering techniques. In addition, this paper discusses the effect of modified phong shading model in order to create toon shading appearance

Shadow Generation in Mixed Reality: A Comprehensive Survey

This paper provides an overview of the issues and techniques involved in shadow generation in mixed reality environments. Shadow generation techniques in virtual environments are explained briefly. The key factors characterizing the well-known techniques are described in detail and the pros and cons of each technique are discussed. The conceptual perspective, the improvements, and future techniques are also investigated, summarized, and analysed in depth. This paper aims to provide researchers with a solid background on the state-of-the-art implementation of shadows in mixed reality. Thus, this could make it easier to choose the most appropriate method to achieve the aims. It is also hoped that this analysis will help researchers find solutions to the problems facing each technique