Media archiving is the process of transforming a source to its digital form. This process, however, often leads to the irregular distribution of image illumination, which distorts the content of images. In this article, we propose a hybrid illumination technique based on double Niblack thresholds (DNT-based) to refine the brightness of underexposed and overexposed images, including the text image and the text-photo image. In particular, we introduce the watermarking concept to the transformation so that the improver can demonstrate the copyright of this refinement in the future. Experimental results have shown that the new method can effectively adjust the illumination to improve the quality of digital images without influencing the appended watermark.
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