Power Reduction of OLED Displays by Tone Mapping Based on Helmholtz-Kohlrausch Effect

Shiga, Tomokazu; Soshi, Kitahara

doi:10.1587/transele.e100.c.1026

Cited by 4 publications

(2 citation statements)

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“…In addition, we employed real human visual evaluations for image quality assessment through user study instead of SSIM. T. Shiga et al [29] used the Helmholtz-Kohlraush effect, where humans perceive a high saturation image as a brighter image even if their luminance are same, to save the power consumption of OLED display while minimizing the deterioration of human visual satisfaction. They saved power by lowering the luminance of pixels and compensated for bright, which is decreased due to the luminance decrease, by increasing saturation.…”

Section: Related Workmentioning

confidence: 99%

Human Perceptuality-Aware Tone-Mapping-Based Dynamic Voltage Scaling for an AMOLED Display Smartphone

et al. 2021

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In recent years, people have wanted to watch high dynamic range imagery which can give high human visual satisfaction on smartphones and demand longer smartphone battery time. However, compression of dynamic range using tone-mapping operators is required in smartphones because most smartphone displays currently have a low dynamic range, and this causes loss of local contrast and details to compress dynamic range. Thus, in this paper we propose a novel dynamic voltage scaling scheme tightly coupled with a modified tone-mapping operator to achieve high power saving as well as good human perceptuality on an AMOLED display smartphone. In order to perform a human perceptuality-aware voltage control, we control display panel voltage to save power consumption and use a well-adjusted global tone-mapping operator to convert image brightness and unsharp masking to enhance local contrast and details and control. We implement the proposed scheme on the AMOLED display Android smartphone and experiment with various high dynamic range image databases. Experimental results show that not only tone-mapped images but also general images are improved in terms of human visual satisfaction and power saving, compared to conventional techniques.

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Section: Related Workmentioning

confidence: 99%

Human Perceptuality-Aware Tone-Mapping-Based Dynamic Voltage Scaling for an AMOLED Display Smartphone

et al. 2021

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“…A simple yet naïve way to lower this power consumption is to lower the per-pixel luminance of the entire screen at the same ratio [1], but another yet better way is to minimize the user's perception of image quality changes while maintaining the relative luminance to be similar by increasing the 'saturation' in HSV of each pixel. This is the rationale behind the Helmholtz-Kohl [2] effect and its effectiveness has already been proven in various papers and many studies have been conducted along this line [3][4] [5]. Though the Helmholtz-Kohl effect is a significant discovery in the area of visual recognition for HVS, its implementation has not been industry standardized.…”

Section: Introductionmentioning

confidence: 99%

P‐141: Late‐News Poster: Chroma Remapping Power Saving Technique for OLEDs

Jang,

Chung,

Lee

et al. 2023

Symp Digest of Tech Papers

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This paper proposes a novel image processing algorithm that maintains perceivable luminance as much as possible while it significantly reduces EL power consumption of OLED based upon a well‐known Helmholtz‐Kohl effect which is one of the representative theories based on human visual system's (HVS) characteristics of recognizing higher saturation images to be brighter. Proposed method effectively resolves various image artifacts incurred by the modification of ‘saturation’ value in each pixel, by carefully analyzing various image artifacts in each of problematic cases. Experimental results show that we have achieved a score of 4.18 based upon a subjective image quality evaluation methodology (Mean Opinion Score) and an average of 15.3% of EL power consumption savings were achieved in 20 evaluation images at the same time.

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