Reversible integer color transform with bit-constraint

Pei, Soo‐Chang; Ding, Jian-Jiun

doi:10.1109/icip.2005.1530554

Cited by 5 publications

(3 citation statements)

References 6 publications

(7 reference statements)

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“…The problem of improving the perception of images reproduced in grayscale is known [25][26][27][28]. This is evidenced by the use of pseudo-coloring techniques, for example in X-ray imaging [22,29].…”

Section: Methods Of Pseudo-coloring With the Rgb Palettementioning

confidence: 99%

Pseudo-Coloring as an Effective Tool to Improve the Readability of Images Obtained in an Electromagnetic Infiltration Process

Kubiak,

Przybysz

2023

Applied Sciences

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The article presents a method of improving the readability of images obtained in the process of electromagnetic infiltration for sources processing information in a visual form (texts, images). The method uses the so-called technique of pseudo-coloring. The proposed method is based on LUT tables using the exponential function mapping the signal level of the compromising emanations into a point of the RGB color space. The conducted analyses showed that the proposed function determining the coefficients of the LUT table is an effective tool in the process of improving the level of visual perception, i.e., it increases the perception of shapes and the ability to extract elements from the background. In image processing, LUT can be identified as a color map, i.e., a structure that reflects the gray shade of an image pixel into its color representation in the RGB color space. The proposed method assumes the use of exponential functions for this reflection. As an assessment of the effectiveness of the proposed methods of pseudo-coloring images, both a subjective assessment based on the visual perception of a group of observers and an analytical assessment, which was carried out by analyzing the contrast of the assessed images, were adopted. This allowed for the same assessment and usefulness of the proposed function in determining the RGB value in the process of pseudo-coloring of images obtained during electromagnetic infiltration. The obtained results confirmed that the proposed method significantly improves contrast parameter of images, which is also confirmed by the visual assessment of these images.

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Section: Methods Of Pseudo-coloring With the Rgb Palettementioning

confidence: 99%

Pseudo-Coloring as an Effective Tool to Improve the Readability of Images Obtained in an Electromagnetic Infiltration Process

Kubiak,

Przybysz

2023

Applied Sciences

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“…So far, various types of lossless coding algorithms have been proposed for such images. Those are categorized into prediction based method [1-3, 6, 7] and transform-based method [4,[8][9][10][11][12][13][14][15][16][17].…”

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confidence: 99%

“…Its adaptability is essentially the same as the Karhunen-Loève Transform (KLT). So far, various RCTs based on KLT have been reported [10][11][12][13][14][15]. In [16,17], permutations of Givens rotations implemented in the lifting structure were introduced to avoid the singular point problem (existing method II).…”

mentioning

confidence: 99%

Reversible color transform for Bayer color filter array images

Poomrittigul

Ogawa

Iwahashi

et al. 2013

SIP

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In this paper, we propose a reversible color transform (RCT) for color images acquired through a Bayer pattern color filter array. One existing RCT with fixed coefficients is simple to implement. However, it is not adaptive to each of input images. Another existing RCT based on eigenvector of covariance matrix of color components, which is equivalent to Karhunen–Loève transform (KLT), is adaptive. However, it requires heavy computational load. We remove a redundant part of this existing method, utilizing fixed statistical relation between two green components at different locations. Comparing to the KLT-based existing RCT, it was observed that the proposed RCT keeps adaptability and has better coding performance, even though its computational load is reduced.

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