發(fā)布時(shí)間：2018-02-11 11:00

  本文關(guān)鍵詞： 全局調(diào)光 主灰度 圖像分類 分區(qū)調(diào)光 多重分區(qū) 背光分配 鏡頭特征　出處：《合肥工業(yè)大學(xué)》2016年博士論文　論文類型：學(xué)位論文

【摘要】：液晶顯示器經(jīng)過多年來的發(fā)展已經(jīng)成為電子通信、家用電器、航空航天、工業(yè)控制和汽車電子等領(lǐng)域的主流顯示設(shè)備。液晶顯示器作為一種非自主發(fā)光的顯示器件需要使用背光模組作為它的光源。背光模組主要由LED及光學(xué)膜系構(gòu)成,依據(jù)LED放置位置不同分為直下式和側(cè)出式背光模組。一般液晶顯示器的背光模組輸出亮度恒定,這會(huì)導(dǎo)致顯示器功耗過高且存在漏光問題。所以動(dòng)態(tài)調(diào)光技術(shù)被提出,該技術(shù)是根據(jù)圖像內(nèi)容動(dòng)態(tài)控制背光亮度并對(duì)液晶像素進(jìn)行補(bǔ)償,能夠有效降低能耗并提高對(duì)比度。動(dòng)態(tài)調(diào)光技術(shù)依據(jù)對(duì)背光模組的控制方式不同可以分為全局調(diào)光技術(shù)和分區(qū)調(diào)光技術(shù)。本文旨在深入分析現(xiàn)有的動(dòng)態(tài)調(diào)光技術(shù),研究動(dòng)態(tài)調(diào)光的核心問題。依據(jù)數(shù)字視頻處理的相關(guān)原理,探索視頻分割方法與動(dòng)態(tài)調(diào)光技術(shù)的結(jié)合運(yùn)用；使用圖像特征提取和圖像增強(qiáng)等技術(shù),改進(jìn)動(dòng)態(tài)調(diào)光算法涉及的背光提取和圖像補(bǔ)償方法；完成全局動(dòng)態(tài)調(diào)光顯示系統(tǒng)和分區(qū)動(dòng)態(tài)調(diào)光顯示系統(tǒng)的開發(fā)工作。主要的研究工作包括：1)綜合分析了現(xiàn)有背光提取方法的優(yōu)缺點(diǎn),建立了一套用于動(dòng)態(tài)調(diào)光算法評(píng)價(jià)的指標(biāo)體系。使用統(tǒng)計(jì)分析方法建立圖像特征與合理背光值之間的關(guān)系,從而提出了一種基于直方圖和主灰度背光提取算法。2)用于動(dòng)態(tài)調(diào)光的S型曲線調(diào)節(jié)參數(shù)對(duì)于不同類型的圖像適應(yīng)性不夠好,所以使用圖像分類和人臉圖像判別等算法分析圖像類型,依據(jù)圖像類型調(diào)節(jié)S型曲線參數(shù),以便達(dá)到更好的顯示效果并降低能耗。同時(shí)針對(duì)S型曲線參數(shù)快速變化導(dǎo)致圖像閃爍的問題進(jìn)行修正,引入a值平滑機(jī)制來有效地減少圖像閃爍。3)為了適應(yīng)不同背光結(jié)構(gòu)和分區(qū)方式提出了一種多重分區(qū)動(dòng)態(tài)調(diào)光算法。通過采用多重分區(qū)劃分圖像確定每個(gè)分區(qū)的背光值。針對(duì)側(cè)出式分區(qū)背光算法的背光分配問題,使用模擬退火算法基于能量消耗最低原則求取近似最優(yōu)的背光值分配方案。4)提出一種基于視頻鏡頭特征的動(dòng)態(tài)調(diào)光方法。該算法使用亮度、主顏色直方圖和顏色方差參數(shù)來分割視頻,確定每個(gè)鏡頭的視頻類型,依據(jù)視頻類型選擇合適的調(diào)光參數(shù)。5)依據(jù)本論文的算法研究成果設(shè)計(jì)了三款動(dòng)態(tài)調(diào)光顯示器樣機(jī)并進(jìn)行了顯示效果測(cè)試和節(jié)能率測(cè)試。
[Abstract]:After years of development, LCD has become electronic communication, home appliances, aerospace, Liquid crystal display (LCD), as an involuntary luminous display device, needs to use backlight module as its light source. The backlight module is mainly composed of LED and optical film system. According to the position of LED, it can be divided into straight down and side out backlight modules. The output brightness of LCD backlight module is constant, which will lead to high power consumption and light leakage. So dynamic dimming technology has been proposed. The technology is to dynamically control the backlight brightness according to the image content and compensate the LCD pixels. Dynamic dimming technology can be divided into global dimming technology and zonal dimming technology according to the control mode of backlight module. The purpose of this paper is to deeply analyze the existing dynamic dimming technology. This paper studies the core problems of dynamic dimming. According to the related principles of digital video processing, it explores the combination of video segmentation method and dynamic dimming technology, uses image feature extraction and image enhancement techniques, etc. Improving the backlight extraction and image compensation method of dynamic dimming algorithm; The development of global dynamic dimming display system and zonal dynamic dimming display system is completed. The main research work includes: 1) the advantages and disadvantages of existing backlight extraction methods are comprehensively analyzed. A set of index system for dynamic dimming algorithm evaluation is established, and the relationship between image features and reasonable backlight value is established by using statistical analysis method. Therefore, an algorithm based on histogram and main gray level backlight extraction algorithm. 2) for dynamic dimming, S-shape curve adjustment parameters are not good enough for different types of images. Therefore, image classification and face image discrimination algorithms are used to analyze image types, and S-type curve parameters are adjusted according to image types. In order to achieve better display effect and reduce energy consumption. At the same time, the problem of image flicker caused by the rapid change of S-shape curve parameters is corrected. In order to adapt to different backlight structure and partition mode, a dynamic dimming algorithm for multiple partitions is proposed. The back of each partition is determined by using multi-multiple partition images. For the backlight assignment problem of the side-out partition backlight algorithm, A dynamic dimming method based on video shot features is proposed by using simulated annealing algorithm to obtain approximately optimal backlight value allocation scheme based on the principle of minimum energy consumption. The main color histogram and color variance parameters are used to segment the video and determine the video type of each shot. According to the algorithm of this paper, three dynamic dimming display prototypes are designed, and the display effect and energy saving rate are tested.
【學(xué)位授予單位】：合肥工業(yè)大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2016
【分類號(hào)】：TP391.41;TN873.93

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