Content-based image retrieval, also known as query by image content (QBIC) and content-based visual information retrieval (CBVIR), is the application of computer vision techniques to the image retrieval problem, that is, the problem of searching for digital images in large databases (see this survey for a scientific …

What is content based information retrieval?

A content-based retrieval system processes the information contained in image data and creates an abstraction of its content in terms of visual attributes. Thus, every image inserted into the database is analyzed, and a compact representation of its content is stored in a feature vector, or signature.

What is image retrieval techniques?

An image retrieval system is a computer system used for browsing, searching and retrieving images from a large database of digital images. Additionally, the increase in social web applications and the semantic web have inspired the development of several web-based image annotation tools.

What is content based image and video retrieval?

Basically, CBIR & CBVR system tries to retrieve images or videos similar to a user-query and their goal is to retrieve similar image or video based on content properties such as shape, colour, texture, motion. Content properties typically set into the feature vectors.

What are the challenges of CBIR and CBVR?

Most important general challenges in CBIR are as follows:

• Precision.
• Recall.
• Noise.
• Rotation.
• Computational Complexity.
• Multi scale.

What is the use of CBIR?

The CBIR technology has been used in several applications such as fingerprint identifi- cation, biodiversity information systems, digital libraries, crime prevention, medicine, historical research, among others.

What is content based multimedia retrieval system?

Content-based multimedia information retrieval (IR) provides new models and methods for effectively and efficiently “searching” through the huge variety of media that are available in different kinds of repositories (digital libraries, Web portals, social networks, multimedia databases, etc.).

What is sketch based image retrieval?

Sketch-based image retrieval (SBIR) is the task of retriev- ing images from a natural image database that correspond to a given hand-drawn sketch. As a result, existing methods simply learn to associate sketches with classes seen during training and hence fail to gen- eralize to unseen classes.

What features of images are used to realize retrieval of images from data bases?

The visual characteristics of images such as color, texture, and shape are widely used for image indexing and retrieval. In recent years, various content-based image retrieval methods have sprung up. Color is the most used feature in image retrieval, and its definition is related to the color space used by the image.

What are the two basic approaches to image retrieval?

This digital information can be in the form of digital images as images are one of the best ways of sharing, understanding and memorizing the information. Image retrieval can be categorized into two types; exact image retrieval and relevant image retrieval.

What are the challenges of CBIR?

What is content based video retrieval?

Content based video retrieval is an approach for facilitating the searching and browsing of large image collections over World Wide Web. In this approach, video analysis is conducted on low level visual properties extracted from video frame.

What is content-based image retrieval?

Content-based image retrieval (CBIR) is regarded as one of the most effective ways of accessing visual data [1]. It deals with the image content itself such as color, shape and image structure instead of annotated text.

What is the difference between CBIR and retrieval index?

The retrieval index should be produced automatically, which provides more a visual retrieval interface to users. CBIR refers to image content that is retrieved directly, by which the images with certain features or containing certain content will be searched in an image database.

Can fused features improve feature retrieval?

Based on these works, a CBIR system is designed using color and texture fused features by constructing weights of feature vectors. The relevant retrieval experiments show that the fused features retrieval brings better visual feeling than the single feature retrieval, which means better retrieval results. 1. Introduction

What are the MPEG-7 color and texture descriptors?

In the MPEG-7 standard, a set of color and texture descriptors including histogram-based descriptors, spatial color descriptors and texture descriptors were defined to interpret natural images [14]. Some researches aim to reducing the semantic gap between the visual features and the richness of human semantics [15].