• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2007년도 추계학술대회논문집
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• pp.1288-1292
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• 2007

Mobile phone is necessary articles by increasing mobile communication now. People usually use the Mobile phone in any time and place. Ring tone of Mobile phone effect owner or other person. The sound level of Mobile phone ring tone could be considered as noise if it is too loud a specific situation. Manufacturing company improve ring tone of mobile phone better in consumer's perception. In this study, we record ring tone of mobile phone and estimated the complexity and nonlinear characteristics of the relation between subjective evaluation and sound metrics. Linear regression models were obtained for the subjective evaluation and sound quality metrics. Semantic Differential Method is used to study sound quality Evaluation. To analyze the sound quality of ring tone.

• 품질경영학회지
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• 제16권1호
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• pp.1-7
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• 1988

The most important element upon the quality of family glass products is the color of glass, which is the first object of consumers concern in purchasing. Therefore, colorless and transparent color tone can level up the additional value of the products. But we have produced the glass products in a large quantity by using the automatic tank brazier, chronic problem has been left over the color tone. By compounding and analizing the management techniques applied by peculiar technique and design of experiments pertinently, and by adjusting the decoloring composition ratio, we can contribute to improvement of color tone as well as to the cost reduction by diminishing the unnecessary decoloring agent. Intangible effect was the securing the superiority of quality home and abroad with the improvement of color tone and was taking a triangular position the factors influencing the glass decoloring which had been an unexhausted field. Tangible effect was the reduction of decoloring cost by diminishing the unnecessary oxidant. We registered the optimal composition ratio condition which was searched by applicating the design of experiments. To maintain good color tone, we manage the degree of purity, the most important thing among the items of color tone, continuously by control chart and it has maintained steady state now.

• 반도체디스플레이기술학회지
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• 제20권2호
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• pp.137-140
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• 2021

High dynamic range (HDR) technology has been drawing attention in the field of imaging and consumer entertainment. As tools for capturing and creating HDR contents, encoding, and transmission evolve to support HDR formats, various display capabilities are being developed and increased. Hence, there is need for remapping native HDR imagery for display on lower quality legacy standard dynamic range (SDR) displays. This operation is referred to as tone mapping. In this paper, we present a sectional tone mapping method by Lenzen, and expand upon a tone mapping approach to improve temporal stability while maintaining picture quality. Compared to the existing block-based sectional tone mapping, our method uses the edge awareness-based tone mapping. We estimate the performance of the objective metric on temporal flickering. The experimental result shows that the algorithm maintains a smoother relationship between the output luminance values, and this reveals success in reducing halos and improving temporal stability with adopted edge aware filtering.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제9권9호
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• pp.3672-3684
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• 2015

Recently, the standardization of backward compatible JPEG image coding for high dynamic range (HDR) image has been undertaken to establish an international standard called "JPEG XT." The JPEG XT consists of two layers: the base layer and the residual layer. The base layer contains tone mapped low dynamic range (LDR) image data and the residual layer contains the error signal used to reconstruct the HDR image. This paper gives the result of a study to evaluate the overall performance of tone mapping operators (TMOs) for this standard. The evaluation is performed using five HDR image datasets and six TMOs for profiles A, B, and C of the proposed JPEG XT standard. The Tone Mapped image Quality Index (TMQI) and no reference image quality assessment (NR IQA) are used for measuring the LDR image quality. The peak signal to noise ratio (PSNR) is used to evaluate the overall compression performance of JPEG XT profiles A, B, and C. In TMQI and NR IQA measurements, TMOs using display adaptive tone mapping and adaptive logarithmic mapping each gave good results. A TMO using adaptive logarithmic mapping gave good PSNRs.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2002년도 ITC-CSCC -3
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• pp.1495-1498
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• 2002

The constrained average method is one of dither methods which combines edge emphasis and grayscale rendition to provide legibility of textual region and proper quality of continuous tone region. How-ever, image quality of continuous tone region is insufficient compared to other dither methods, such as ordered dither methods or the error diffusion method. The constrained average method uses a uniform distribution function to decide number of lit pixels related to the average intensity in a picture area. However, actual distribution of continuous tone region is closer to the Laplacian distribution or triangle distribution. In this paper, we introduce various probability distributions and the actual luminance distribution to decide the threshold value of the constrained average method in order to improve image quality of dithered image.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 1999년도 하계종합학술대회 논문집
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• pp.575-578
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• 1999

The principal features of a face are as follows : skin-tone, symmetry, and requisites such as shape of ellipse, eyes, nose, mouth. Also, faces have different size, various shape and position. In case of application of face recognition and detection without preprocessing, efficiency of the performance is decreased. In addition, face itself, complex background, image quality, etc. are included. Therefore, previous face recognition methods are implemented on the base of specific constraints of the face image. In this paper, we propose the efficient and automatic face detection algorithm for minimizing influence such as complex background, image quality, etc. This face detection technique consists of skin-tone, candidate face region and face region extractions.

• 한국정보통신학회논문지
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• 제22권2호
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• pp.270-275
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• 2018

영상의 화질을 개선하는 방법은 색 사상 방법과 레티넥스 방법으로 나누어진다. 색 사상 방법의 대표적인 예는 히스토그램을 기반으로 영상의 화질을 개선하는 방법이다. 본 논문에서는, 영상 품질 향상을 위한 색 사상 기반 실시간 광역역광보정 알고리즘의 하드웨어 설계를 제안한다. 제안하는 방법은 영상을 밝기 영역과 색 영역으로 나눈 후, 밝기 영역의 변화량을 기초하여 색 영역을 개선한다. 또한, 고품질의 영상을 원하는 흐름에 맞추어, 12bit로 확장된 신호를 사용하며, 기존의 8bit 신호와도 호환이 가능하게 설계하였다. 시뮬레이션 결과로 영상의 화질의 개선됨을 확인 하였으며, 하드웨어 설계 결과 최대 138.26MHz로 실시간 동작이 가능함을 확인하였다.

• 한국지능시스템학회논문지
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• 제11권6호
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• pp.510-515
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• 2001

일반적으로 음성신호로부터 사람의 감정을 인식할 수 있는 요소는(1)대화의 내용에 사용한 단어, (2)톤 (tore), (3)음성신호의 피치(Pitch), (4)포만트 주파수(Formant Frequencey)그리고 (5)말의 빠르기(Speech Speed)(6)음질(Voice Quality)등이다. 사람의 경우는주파수 같은 분석요소 보다 톤과 단어 빠르기, 음질로 감정을 받아들이게 되는것이 자연스러운 방법이므로 당연히 후자의 요소들이 감정을 분류하는데 중요한 인자로쓰일 수있다. 그리고, 종래는 주로 후자의 효소들을 이용하였는데, 기계로써 구현하기 위해서는 포만트 주파수를 사용할 수있게 되는것이 도움이 된다. 그러므로, 본 연구는 음성 신호로부터 피치와 포만트, 그리고 말의 빠르기 등을 이용하여 감성인식시스템을 구현하는것을 목표로 연구를 진행하고 있으며, 그 1단계 연구로서 본 논문에서는 화가 나서 내뱉는 말을 기반으로 하여 화난 감정의 독특한 특성을 찾아내었다.

• 한국음향학회지
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• 제9권3호
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• pp.11-23
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• 1990

奚琴 音質의 音響學的 特性을 조사하기 위해 奚琴音의 파워스펙트럼과 時間波形을 FFT Analyzer를 이용하여 분석하였다. 奚琴絃의 張力과 遠山(bridge)의 위치, 腹板(top plate)의 두께등을 변화시키면서 분석을 하였다. 실험에 의하여 다음과 같은 결론을 얻었다. 腹板의 共振周波數가 絃의 基音의 周波數보다 높기 때문에, 基音의 音壓보다 腹板의 共振周波數 부근의 上音들의 音壓이 더 큼을 알았다. 絃의 張力이 강할 때와 遠山이 腹板의 중앙에 위치하였을 때가 音質이 보다 우수하였다. 奚琴 遊絃의 inharmonicity 계수는 0.049 cents/$n^2$이었다. 5kHz 이상의 上音은 발견할 수 없었으며, 奚琴의 inharmonicity가 violin의 inharmonicity보다 큰 값을 나타내었는데 이를 통해 奚琴음의 明瞭度와 豊富性이 부족하다는 것을 알 수 있었다. 奚琴筒의 共振周波數(MAR)와 腹板의 共振周波數(MWR)의 周波數比는 1 octave 정도일 때 奚琴이 가장 좋은 음색을 갖는다는 것을 밝혔으며 이때 腹板의 두께는 4.5mm 정도이다.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2009년도 9th International Meeting on Information Display
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• pp.520-523
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• 2009

The drive towards lowering costs and increasing frame rates results in new panel designs and thereby new photomasks designs. One common way to reduce cost is to reduce the number of production steps. For this multi tone photomasks (MTM) are needed. MTMs contain more information and increases photomask placement requirements. Increasing frame rates lead to shrinking geometries. The combination of HTM and shrinking geometries drastically increases the requirements imposed on the pattern generators used to print the photomasks. New methods are therefore needed to enable future photomask manufacturing. This paper introduces three advanced image quality enhancing methods.