Abstract
Nowadays, many large volume data sets have been generated from numerical simulations and digital measurements in various fields. Advances in computer and measurement device technologies have enabled their use in large-scale numerical simulations and high-resolution digital measurements, thus generating volume data which is continuously increasing in size and complexity. As a result, an efficient technique for a classification of and searching for these data sets is highly desired. Then, we developed the retrieval method that used critical point graph (CPG) as an index that compactly expressed the feature of the volume data. However, an enough examination was not done whether to approve the relation of one to one between CPG and original volume data. In this paper, we investigate whether another volume data that generates the same graph as CPG created from a certain voxel data with the scalar value of 1 byte exists, and examine the validity of CPG as the index for the retrieval.
