本文選題：數(shù)字半色調(diào) + 誤差擴(kuò)散��； 參考：《湖南工業(yè)大學(xué)》2017年碩士論文

【摘要】：數(shù)字半色調(diào)技術(shù)是聯(lián)系模擬原稿或物理場景數(shù)字化轉(zhuǎn)換與印刷的橋梁,是數(shù)字印刷乃至現(xiàn)代化印刷的關(guān)鍵、核心技術(shù)之一。目前這項(xiàng)技術(shù)已經(jīng)被廣泛應(yīng)用到了印刷、水印、信息加密技術(shù)、圖像壓縮、圖像傳輸,醫(yī)學(xué)圖像分析處理等各個(gè)與人們生活水平息息相關(guān)領(lǐng)域中。所有這些技術(shù)領(lǐng)域無一不與人們的生活息息相關(guān),這決定了數(shù)字半色調(diào)技術(shù)在現(xiàn)代圖像處理領(lǐng)域中扮演了極其重要的角色,在硬拷貝輸出和顯示領(lǐng)域具有非常重要的實(shí)用意義。顯然,誤差擴(kuò)散半色調(diào)算法作為數(shù)字半色調(diào)技術(shù)的重要分支具有十分重要的研究價(jià)值,本文主要工作如下:1)當(dāng)前誤差擴(kuò)散算法采用的掃描方式主要有光柵掃描、蛇形掃描、空間填充曲線掃描。光柵、蛇形掃描誤差擴(kuò)散半色調(diào)算法在輸出半色調(diào)圖像的高光和暗調(diào)區(qū)域存在明顯的蠕蟲現(xiàn)象,在中頻區(qū)域存在明顯的結(jié)構(gòu)性紋理;基于空間填充曲線的誤差擴(kuò)散半色調(diào)算法雖然有效降低了半色調(diào)圖像中的蠕蟲現(xiàn)象,但同時(shí)引入了噪聲。鑒于以上原因,提出了一種基于間斷掃描方式的誤差擴(kuò)散半色調(diào)算法,同時(shí)將固定的量化閾值改為自適應(yīng)的量化閾值。在間斷掃描方法中,會(huì)根據(jù)當(dāng)前像素點(diǎn)所處的灰度等級(jí)有選擇性的挑選誤差擴(kuò)散濾波器。與蛇形掃描和光柵掃描方式相比,間斷掃描方式在處理同行像素點(diǎn)的時(shí)候,量化誤差能夠左右雙向傳播,有效的緩解了蠕蟲現(xiàn)象的形成,提高了半色調(diào)圖像的質(zhì)量。2)提出了一種基于改進(jìn)誤差擴(kuò)散濾波器的半色調(diào)算法和基于平均灰度與對(duì)比度聯(lián)合的半色調(diào)圖像質(zhì)量評(píng)價(jià)方法。改進(jìn)的誤差擴(kuò)散濾波器與傳統(tǒng)的誤差擴(kuò)散濾波器相比能夠使得量化誤差擴(kuò)散范圍更廣,能更有效的阻止蠕蟲鏈的形成且沒有引進(jìn)額外的噪聲,在提高半色調(diào)圖像質(zhì)量的同時(shí)也沒有增加額外的計(jì)算復(fù)雜度。
[Abstract]:Digital halftone technology is a bridge between digital conversion and printing of analog manuscripts or physical scenes. It is the key and one of the core technologies of digital printing and even modern printing. At present, this technology has been widely used in printing, watermarking, information encryption technology, image compression, image transmission, medical image analysis and processing and other fields closely related to people's living standards. All these technical fields are closely related to people's lives, which determines that digital halftone technology plays an extremely important role in the field of modern image processing and has very important practical significance in the field of hard copy output and display. Obviously, the error diffusion halftone algorithm as an important branch of digital halftone technology has very important research value. The main work of this paper is as follows: (1) the scanning methods used in the current error diffusion algorithm are mainly raster scanning, snake scanning. Space filling curve scan. Raster, serpentine scan error diffusion halftone algorithm has obvious worm phenomenon in the output halftone image's high light and dark tone region, and obvious structural texture in the intermediate frequency region. Although the error diffusion halftone algorithm based on the space filling curve can effectively reduce the worm phenomenon in the halftone image, noise is introduced at the same time. In view of the above reasons, an error diffusion halftone algorithm based on discontinuous scanning is proposed, and the fixed quantization threshold is changed to an adaptive quantization threshold. In the discontinuous scanning method, the filter is selected selectively according to the gray level of the current pixel. Compared with the snake-like scanning and raster scanning, the quantization error can propagate in both directions when processing the peer pixels, which effectively alleviates the formation of worm phenomenon. (2) A halftone algorithm based on improved error diffusion filter and a method for evaluating the quality of halftone images based on the combination of average gray and contrast are proposed. Compared with the traditional error diffusion filter, the improved error diffusion filter can make the quantization error spread wider, prevent worm chain from forming more effectively and do not introduce extra noise. While improving the halftone image quality, there is no additional computational complexity.
【學(xué)位授予單位】：湖南工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TP391.41

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