A perceptually tuned subband image coder based on the measure of just-noticeable-distortion profile

Chou, Chun-Hsien; Li, Yun-Chin

doi:10.1109/76.475889

Cited by 559 publications

(47 citation statements)

References 33 publications

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“…The consistency between the proposed criteria and the subjective evaluation is clearly identified in the figure. In this paper, we employed three performance indicators between the predicted objective scores after nonlinear regression and subjective scores to evaluate the proposed metrics, which are [42]: the Pearson Correlation Coefficients (PLCC), Spearman Rank Order Correlation Coefficient (SROCC), and Rooted Mean Squared Error (RMSE). Among these indicators, PLCC and RMSE, shown in (5) and (6), reflect the predicted accuracy of objective evaluation criteria, and SROCC, shown in (7), is used to assess prediction monotonicity.…”

Section: Experimental Results and Analysismentioning

confidence: 99%

Objective Evaluation Criteria for Shooting Quality of Stereo Cameras over Short Distance

Chu¹,

Yang²,

Liu³

2015

RADIOENGINEERING

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Abstract. Stereo cameras are the basic tools used to obtain stereoscopic image pairs, which can lead to truly great image quality. However, some inappropriate shooting conditions may cause discomfort while viewing stereo images. It is therefore considerably necessary to establish the perceptual criteria that can be used to evaluate the shooting quality of stereo cameras. This article proposes objective quality evaluation criteria based on the characteristics of parallel and toed-in camera configurations. Considering the different internal structures and basic shooting principles, this paper focuses on short-distance shooting conditions and establishes assessment criteria for both parallel and toed-in camera configurations. Experimental results show that the proposed evaluation criteria can predict the visual perception of stereoscopic images and effectively evaluate stereoscopic image quality.

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Section: Experimental Results and Analysismentioning

confidence: 99%

Objective Evaluation Criteria for Shooting Quality of Stereo Cameras over Short Distance

Chu¹,

Yang²,

Liu³

2015

RADIOENGINEERING

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“…First, the HVS is more sensitive to changes in midluminance areas Ref. 16. That is, to maintain the quality of the marked image, assigning greater value of the scaling factor ␣ m for the midluminance areas is desirable.…”

Section: Determination Of Scaling Factor ␣ M Andmentioning

confidence: 98%

“…2. Second, because the HVS is less sensitive to changes made in highly textured regions, 16 it is therefore helpful to use lower value for the scaling factor in textured regions.…”

Section: Determination Of Scaling Factor ␣ M Andmentioning

confidence: 99%

Removable visible image watermarking algorithm in the discrete cosine transform domain

Yang

Sun

Yang

et al. 2008

J. Electron. Imaging

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A removable visible watermarking scheme, which operates in the discrete cosine transform (DCT) domain, is proposed for combating copyright piracy. First, the original watermark image is divided into 16ϫ 16 blocks and the preprocessed watermark to be embedded is generated by performing element-by-element matrix multiplication on the DCT coefficient matrix of each block and a key-based matrix. The intention of generating the preprocessed watermark is to guarantee the infeasibility of the illegal removal of the embedded watermark by the unauthorized users. Then, adaptive scaling and embedding factors are computed for each block of the host image and the preprocessed watermark according to the features of the corresponding blocks to better match the human visual system characteristics. Finally, the significant DCT coefficients of the preprocessed watermark are adaptively added to those of the host image to yield the watermarked image. The watermarking system is robust against compression to some extent. The performance of the proposed method is verified, and the test results show that the introduced scheme succeeds in preventing the embedded watermark from illegal removal. Moreover, experimental results demonstrate that legally recovered images can achieve superior visual effects, and peak signal-to-noise ratio values of these images are Ͼ50 dB.

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“…The pixel-based JND threshold in [10,11] is determined by two factors, background brightness masking and spatial contrast masking. Yang's JND model [12] is an improvement of the JND model in [11], which deduces the overlap effect between the background brightness masking and the spatial contrast masking, and obtains a more accurate JND model.…”

Section: Jnd Estimationsmentioning

confidence: 99%

Visual Saliency Based Just Noticeable Difference Estimation in DWT Domain

et al. 2018

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Abstract:It has been known that human visual systems (HVSs) can be applied to describe the underlying masking properties for the image processing. In general, HVS can only perceive small changes in a scene when they are greater than the just noticeable distortion (JND) threshold. Recently, the cognitive resources of huma visual attention mechanisms are limited, which can not concentrate on all stimuli. To be specific, only more important stimuli will react from the mechanisms. When it comes to visual attention mechanisms, we need to introduce the visual saliency to model the human perception more accurately. In this paper, we presents a new wavelet-based JND estimation method that takes into account the interrelationship between visual saliency and JND threshold. In the experimental part, we verify it from both subjective and objective aspects. In addition, the experimental results show that extracting the saliency map of the image in the discrete wavelet transform (DWT) domain and then modulating its JND threshold is better than the non-modulated JND effect.

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A perceptually tuned subband image coder based on the measure of just-noticeable-distortion profile

Cited by 559 publications

References 33 publications

Objective Evaluation Criteria for Shooting Quality of Stereo Cameras over Short Distance

Objective Evaluation Criteria for Shooting Quality of Stereo Cameras over Short Distance

Removable visible image watermarking algorithm in the discrete cosine transform domain

Visual Saliency Based Just Noticeable Difference Estimation in DWT Domain

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