CAJ | 학술논문

用数字相机拍摄时,不恰当的光源常导致图像中的不均匀光照,用扫描仪获取图像时也有同样问题.不规则照明对图像质量造成严重损害,用光照平衡技术可消除图像中的这种不均匀照明.该文针对文字图像提出一种光照平衡的改进方法,利用对比度加权来扩大文字和背景之间的差异,使直方图更为均衡,降低不成比例的光强分布引起的对比度不均匀性.实验结果表明,新方法可有效改进失真文字图像的质量,提高文档的可读性.
용수자상궤박섭시,불흡당적광원상도치도상중적불균균광조,용소묘의획취도상시야유동양문제.불규칙조명대도상질량조성엄중손해,용광조평형기술가소제도상중적저충불균균조명.해문침대문자도상제출일충광조평형적개진방법,이용대비도가권래확대문자화배경지간적차이,사직방도경위균형,강저불성비례적광강분포인기적대비도불균균성.실험결과표명,신방법가유효개진실진문자도상적질량,제고문당적가독성.
With digital cameras, an inappropriate light source often leads to uneven illumination of the picture. The same problem also occurs when capturing an image via digital scanners; irregular illumination seriously distorts the image quality. Light balancing can eliminate such uneven illumination in multimedia. In this paper, we provide an improved version of this technique for text images. The new version adopts a contrast weight to amplify distinction between the text and the background. This can equalize the histogram and reduce uneven contrast of the disproportionate light distribution. The simulator shows that the new version can effectively improve the distorted documents with satisfactory quality and readability.