Hewlett-packard Development Company, L.P.

Hewlett-packard Company

Danny Barash

Ron Maurer

Doron Shaked

Renato Keshet

Michael Elad

Ronny Kimmel

Richard Burgin

David E Thedens

Demosaicing convolution kernels are incorporated into the framework of bilateral filtering in order to reduce artifacts at abrupt intensity transitions when a color mosaic pattern is converted to an output image. As a consequence of the bilateral filtering within a window that is selected without intensity considerations, intensity values of pixels that are physically close are given greater weight than intensity values of more distant pixels and, simultaneously, intensity values that are quantitatively similar (i.e., photometrically similar) are given greater weight than intensity values that are quantitatively dissimilar. Using photometric similarity in a demosaicing operation reduces the effects of pixels on one side of an abrupt intensity transition in determining interpolated intensity values for pixels on the opposite side of the abrupt intensity transition.

Bilateral filtering in a demosaicing process

A system and method of image processing for smoothing, denoising, despeckling and sharpening scanned document images which is performed prior to a compression. The scanned image is selectively smoothed by anisotropic diffusion filtering in a single iteration with a 3&times;3 kernel, which provides denoising, edge-preserving smoothing. The smoothed image data is then selectively sharpened using variable contrast mapping that provides overshoot-free variable-sharpening and despeckling. Image quality is improvides while increasing compressibility of the image.

Method for enhancing compressibility and visual quality of scanned document images

Compression of a digital image is performed by bit-depth truncating a luminance channel of the digital image and performing lossless compression on the bit-depth truncated luminance channel; and performing lossy compression on chrominance channels of the digital image.

Method including lossless compression of luminance channel and lossy compression of chrominance channels

Growing community of inventors

Haifa, Israel

Danny Barash