Research And Implementation On Color Invariance Based Image Retrieval

In recent years, due to its board application foreground, Content-Based Image Retrieval is researched largely. Content-Based Image Retrieval uses rock-bottom visual characters, such as color, texture, shape and etc, to retrieving. Among these characters, color is the most intuitive and marked character. Relative to the geometry characters of image, color has invariance about size, direction, and rotation, presently, nearly all the Content-Based Image Retrieval systems using color as an important means to retrieving images. But color is also an unstable visual characters, it is easily affected by the change of illumination. The aim of Color Invariant Description is to find a color description method in image which can truly describe objects'color and robust to the change of illumination.The same scene under different illumination, often take on different colors, rather than the true color of the scene. So if the influence of the illumination on the object isn't considered, there will be a great error in the image searching result. Based on the existing image retrieval techniques, further researching the impact that the changes in illumination to the color characteristics is very significant to improve the performance of image retrieval system, and then enhances the accuracy of image retrieval.After researching the theory, advantage and disadvantage about color histogram, chroma histogram and invariant matrix, this paper brings forward a new algorithm color invariant description based on invariant matrixes. Because image's geometry invariant matrixes can keep invariant about the change of image's scale, translation and rotation, on the basic of imaging theory, this paper follows the principle clearing up the influence of illumination, using invariant matrixes to the whole color information of image, get the method of color invariant description based on invariant matrixes. This method can not only describe the whole color information of image, but also clear up the influence of illumination. On the basic of algorithm, design and realize the VC++ retrieval system using color histogram information and the method of color invariant description based on invariant matrixes, and then validate the robust of illumination of the method of color invariant description based on invariant matrixes and its excellent performance used in image retrieve by experiments.