The recent developments in the multimedia communication technology made it necessary to provide image compression standards with a number of functionalities such as the capability of progressive transmission of the code and more conformity with the human visual perception. The general purpose still image compression standard JPEG2000 for example, incorporates many such functionalities. This the...

Preprocessing, a major component of Character Recognition System, has direct effect on the recognition system by its performance. Using wavelet transform, this paper mainly focuses on noise filtering and Edge Detection in a Preprocessing method for NaXi Pictographs Character Recognition. Image denoising is an important issue in image preprocessing. Based on the analysis of thresholding function...

Hyperspectral Endmember extraction of a set of accurateendmembers is critical for the proper unmixing of Hyperspectral image. Several preprocessing algorithms such as spatial preprocessing (SPP), region based spatial preprocessing (RBSPP), and spatial spectral preprocessing (SSPP) have been developed for the extraction of endmembers. These algorithms require complex operations and huge computat...

In image databases, variations in imaging conditions and preprocessing may result in similar originals that exhibit a low measure of similarity when color information is used in standard image retrieval methods. We examine the performance of various colorbased retrieval strategies to see whether, and to what degree, the effectiveness of retrieval improves with Retinex-based preprocessing, regar...

This paper is an experimental study on the robustness of the eigenfaces method for face recognition. To build a face recognition system, especially in an unconstrained surveillance system where a clear, direct, and normalized view of the face cannot be assumed, one needs to implement several image preprocessing steps like segmentation, deskewing, zooming, rotation, warping, etc., before process...

Focused plenoptic cameras can record spatial and angular information of the light field (LF) simultaneously with higher resolution relative to traditional cameras, which facilitate various applications in computer vision. However, existing image compression methods present ineffectiveness captured images due complex micro-textures generated by microlens relay imaging long-distance correlations ...