Characterizing the high-level content of natural images using lexical basis functions (Editorial Expression of Concern)

Publisher's note: Concerns have been raised that this 2003 SPIE Proceedings paper self-plagiarized content from two previously published conference papers by the same authors without proper citation. The two previously published conference papers are https://doi.org/10.1109/IAI.2002.999897 and https://doi.org/10.1007/3-540-45479-9_38. The authors have been asked for an explanation.