Color coordinate space structure and color quantization method using this color coordinate

摘要

The present invention relates to a color coordinate space structure for content-based image retrieval and a color quantization method using the color coordinates.;In the conventional HSV color space, a change in color that a human's vision feels in the same space appears differently. In this case, if the color is simply quantized in the HSV color space, the quantized colors do not express all colors evenly. The difficulty of vector quantization and the increase of computation is one factor that degrades the content-based image retrieval performance.;As shown in FIG. 1, the present invention proposes a new color space structure composed of color (Hue = h ^o ), maximum value (Max = max), minimum value (Min = min), and difference value (Difference = d). And a color coordinate space structure for performing color quantization (mapping M colors into N colors; M N, M and N are positive integer values) using coordinate values in the color space, and color quantization using the color coordinates. By providing a method, it is possible to consider the visual characteristics of a person and to perform high speed digital processing of color mapping.