WordNet

with regard to perception; "this task is perceptually very difficult"
of or relating to the act of perceiving; "perceptual stimulus"

PrepTutorEJDIC

知覚[力]の,知覚力のある

English Journal

A Perceptually Relevant MSE-Based Image Quality Metric.

Tan HL, Li Z, Tan YH, Rahardja S, Yeo C.AbstractImage quality metrics (IQMs), such as the mean squared error (MSE) and the structural similarity index (SSIM), are quantitative measures to approximate perceived visual quality. In this paper, through analyzing the relationship between the MSE and the SSIM under an additive noise distortion model, we propose a perceptually relevant MSE-based IQM, MSE-SSIM, which is expressed in terms of the variance of the source image and the MSE between the source and distorted images. Evaluations on three publicly available databases (LIVE, CSIQ, and TID2008) show that the proposed metric, despite requiring less computation, compares favourably in performance to several existing IQMs. In addition, due to its simplicity, MSE-SSIM is amenable for the use in a wide range of image and video tasks that involve solving an optimization problem. As an example, MSE-SSIM is used as the objective function in designing a Wiener filter that aims at optimizing the perceptual visual quality of the output. Experimental results show that the images filtered with a MSE-SSIM-optimal Wiener filter have better visual quality than those filtered with a MSE-optimal Wiener filter.
IEEE transactions on image processing : a publication of the IEEE Signal Processing Society.IEEE Trans Image Process.2013 Nov;22(11):4447-59. doi: 10.1109/TIP.2013.2273671.
Image quality metrics (IQMs), such as the mean squared error (MSE) and the structural similarity index (SSIM), are quantitative measures to approximate perceived visual quality. In this paper, through analyzing the relationship between the MSE and the SSIM under an additive noise distortion model, w
PMID 24057005

Reducing integrability error of color tensor gradients for image fusion.

Montagna R, Finlayson GD.AbstractTo overcome the difficulties in applying gradient-based operators to color images, Di Zenzo introduced the color tensor, an operator that provides a gradient field for multichannel images. An elegant application for this operator was developed in the domain of multichannel image visualization: Socolinsky and Wolff proposed to reintegrate Di Zenzo's gradient by solving a Poisson equation, yielding a greyscale representation of the multispectral contrast of the input image. Di Zenzo's gradients are, however, generally not integrable and some approximation must be introduced. Thus, the resulting image can suffer from artifacts such as the smearing of edges. In this paper, we focus on the integrability of Di Zenzo's gradients. We show that the integrability of the obtained field can be improved dramatically through a simple desaturation of the color image (as in the HSV color space). This result can be readily extended to multispectral images by defining an analogue to saturation. We present several results explaining what happens to color tensors as the saturation changes. Significantly we show that small changes of the saturation in the linear image space can result in large improvements in the integrability of tensor gradients calculated in logarithmic color space. This result is important for two reasons. 1) Log-differences are more perceptually meaningful. 2) In log-space we can operate with retinex algorithms, which are well known techniques for contrast enhancement. We propose that they can be used to "put back" any contrast that might be lost in the desaturation step and, more importantly, they can enhance contrast at the same time as reintegrating the gradient field because of their relation to partial differential equations. Finally, we evaluate our method psychophysically. Compared with other commonly used image fusion methods, experiments show that our data fusion using the Di Zenzo color tensor after desaturating the image and where a simple contrast boost is applied is strongly preferred.
IEEE transactions on image processing : a publication of the IEEE Signal Processing Society.IEEE Trans Image Process.2013 Oct;22(10):4072-85. doi: 10.1109/TIP.2013.2270108. Epub 2013 Jun 19.
To overcome the difficulties in applying gradient-based operators to color images, Di Zenzo introduced the color tensor, an operator that provides a gradient field for multichannel images. An elegant application for this operator was developed in the domain of multichannel image visualization: Socol
PMID 23797256

A no-reference perceptual based contrast enhancement metric for ocean scenes in fog.

Gibson KB, Nguyen TQ.AbstractIn this paper, we develop a perceptually based contrast enhancement metric as a means to solve the problem of autonomously enhancing images degraded by fog that are perceptually pleasing to humans. A learning based approach is considered to develop the contrast enhancement using human observations and low-level contrast enhancement metrics based on the human vision system. In addition, we provide new low-level metrics based on the physics of the scene to improve the performance of existing contrast enhancement metrics. This paper shows that a contrast enhancement metric can be designed to mimic human preference.
IEEE transactions on image processing : a publication of the IEEE Signal Processing Society.IEEE Trans Image Process.2013 Oct;22(10):3982-93. doi: 10.1109/TIP.2013.2265884. Epub 2013 Jun 3.
In this paper, we develop a perceptually based contrast enhancement metric as a means to solve the problem of autonomously enhancing images degraded by fog that are perceptually pleasing to humans. A learning based approach is considered to develop the contrast enhancement using human observations a
PMID 23744681

Japanese Journal

Partial Encryption Method That Enhances MP3 Security

OO Twe Ta,ONOYE Takao,SHIN Kilho
IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences E98.A(8), 1760-1768, 2015
… Our method reduces time consumption by encrypting only the perceptually important parts of an MP3 file rather than the whole file, and the resulting encrypted file is still compatible with the MPEG standard so as to be rendered by any existing MP3 players. …
NAID 130005089905

Perceptually Optimized Missing Texture Reconstruction via Neighboring Embedding

OGAWA Takahiro,HASEYAMA Miki
IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences E98.A(8), 1709-1717, 2015
… Perceptually optimized missing texture reconstruction via neighboring embedding (NE) is presented in this paper. … This provides a solution to the problem of previously reported methods not being able to perform perceptually optimized reconstruction. …
NAID 130005089900

Selective Attention Mechanisms for Visual Quality Assessment

ENGELKE Ulrich
IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences E98.A(8), 1681-1688, 2015
… Selective visual attention is an integral mechanism of the human visual system that is often neglected when designing perceptually relevant image and video quality metrics. …
NAID 130005089895