A nonuniform quantization index modulation watermarking algorithm based on image wavelet transform was presented to improve the robustness and invisibility of digital watermark.

Prestley s mathematical model of non-uniformly modulated evolutionary random pro- cess takes into account the non-stationary chaxacteristics not only of the excitation intensity, but also of the excitation frequency components.

The algorithm employs a compressed halftoned binary image as watermark and embeds it in the wavelet domain through quantization index modulation.

A novel image watermarking scheme based on Patchwork and quantization index modulation(QIM) is proposed.

Instead of quantizing Hough space uniformly as widely utilized in the SHT,Standard Hough Transform,this paper proposes a HT algorithm with nonuniform quantization of Hough space,namely NUHT,which stems from a close investigation into the angle dependency of the minimum distance and angle spacing between adjacent line segments.

The effects of the bound,resolution,and other parameters for uniform and nonuniform quantization schemes are discussed.

So this paper introduces nonuniform quantization method and proposes an algorithm based on nonuniform quantitative Hough transform in blocks segmented.

It researches the coding technique for remote sensing image compact which uses the methods of non uniform sampling and nonuniform quantizing aerial resampling.