Non-Linear Scale-Selection for Image Compression Improvement Obtained by Perceptual Distortion Criteria
نویسندگان
چکیده
The effect of linear and non-linear diffusions prior to Joint Photographic Experts Group’s (JPEG) standard baseline compression is analysed and compared. We shall show that anisotropic diffusion acts as an adaptive filtering that extracts and preserves the important visual information, and it will be shown how it can be used as a preprocessing method for compression artefact reduction. The selection of the appropriate preprocessing parameters at a specified bit rate greatly reduces the compression artefacts. The selection criteria were determined using a perceptual error metric based on a model of the human visual system.
منابع مشابه
Image Structure Preserving of Lossy Compression in the Sense of Perceptual Distortion When Using Anisotropic Diffusion Preprocessing
In this paper we show how the image structure can be better preserved at lossy compression, when compression artifact is reduced with perceptually adaptive filtering by means of anisotropic diffusion, performed on the image before coding. Adaptive filtering extracts and preserves the important visual information, and it will be discussed in the context of the non-linear scale-space theory. Amon...
متن کاملPlanelet Transform: A New Geometrical Wavelet for Compression of Kinect-like Depth Images
With the advent of cheap indoor RGB-D sensors, proper representation of piecewise planar depth images is crucial toward an effective compression method. Although there exist geometrical wavelets for optimal representation of piecewise constant and piecewise linear images (i.e. wedgelets and platelets), an adaptation to piecewise linear fractional functions which correspond to depth variation ov...
متن کاملWavelet-based image compression using perceptual distortion metric
In this paper, we have implemented a dithered quantization model to be used with perceptual distortion metric. Mean-square-error (MSE) based cost functions are mostly used for image coding. However, MSE does not necessarily preserve the perceptual quality of the original image. We are using Minkowsky metric as the criterion for allocating bits into various subbands to achieve desired degree of ...
متن کاملThe role of perceptual contrast non-linearities in image transform quantization
The conventional quantizer design based on average error minimization over a training set does not guarantee a good subjective behaviour on individual images even if perceptual metrics are used. In this work a novel criterion for transform coder design is analyzed in depth. Its aim is to bound the perceptual distortion in each individual quantization according to a non-linear model of early hum...
متن کاملImage Compression by Parameterized-Model Coding of Wavelet Packet Near-Best Bases
Top-down tree search algorithms with non-additive information cost comparisons as decision criteria have recently been proposed by Taswell for the selection of near-best bases in wavelet packet transforms. Advantages of top-down non-additive near-best bases include faster computation speed, smaller memory requirement, and extensibility to biorthogonal wavelets in addition to orthogonal wavelets...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 1999