Feature extraction and description is an important topic of computer vision, as it is the starting point of a number of tasks such as image reconstruction, stitching, registration, and recognition among many others. In this paper, two new image features are proposed: the Information Ratio (IR) and the Mutual Information Ratio (MIR). The IR is a feature of a single image, while the MIR describes features common across two or more images.We begin by introducing the IR and the MIR and motivate these features in an information theoretical context as the ratio of the self-information of an intensity level over the information contained over the pixels of the same intensity. Notably, the relationship of the IR and MIR with the image entropy and mutual information, classic information measures, are discussed. Finally, the effectiveness of these features is tested through feature extraction over INRIA Copydays datasets and feature matching over the Oxfords Affine Covariant Regions. These numerical evaluations validate the relevance of the IR and MIR in practical computer vision tasks

该论文提出了两个新的图像特征，即信息比率（IR）和相互信息比率（MIR），并在信息理论的背景下阐述了IR和MIR的关系，用于图像重建，拼接，镶嵌和识别等计算机视觉任务，并在INRIA Copydays数据集和Oxfords Affine Covariant Regions上进行了数字评估，证实了这些特征在实际计算机视觉任务中的有效性。

用于图像特征计数及其匹配的信息和互信息比率