Comparative analysis of color- and grayscale-based feature descriptions for image recognition

摘要

The method for evaluating the applicability of color- and grayscale-based feature spaces to the image recognition problem is considered. The Histogram of Oriented Gradients (HOG) is used as a descriptor of the image area. Color descriptions involve the gradient calculated from one of the channels of the HSV space or the CIECAM02 model [3]. Parametric optimization is performed for each descriptor to determine the gradient threshold and size of the image area. The Mahalanobis distance between descriptions of images of different classes is used as the optimality criterion. Feature spaces are analyzed in terms of classification of open and closed eyes. The description separability of eye images of different classes has proved to be higher when using color-based descriptors with adaptation to saturation.