Near Hue-Preserving Reversible Contrast and Saturation Enhancement Using Histogram Shifting
Near Hue-Preserving Reversible Contrast and Saturation Enhancement Using Histogram Shifting
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DOI：
10.1587/transinf.2021mup0001
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发表时间：
2022-01-01
影响因子：
0.7
通讯作者：
Hasegawa, Madoka
中科院分区：
文献类型：
--
作者：
Kurokawa, Rio;Yamato, Kazuki;Hasegawa, Madoka
近年来，已经提出了几种使用数字水印的彩色图像的可逆对比度增强方法。这些方法可以从对比度增强图像中恢复原始图像，其中恢复原始图像所需的信息与其他有效负载一起嵌入。在这些方法中，增强后的色调分量与原始图像的色调分量相似。然而，增强后的图像饱和度明显低于原始图像，并且获得的图像呈现出苍白的色调。在这里，我们提出了一种增强彩色图像的对比度和饱和度并以可逆的方式几乎保留色调分量的方法。我们的方法整合了红色、绿色和蓝色直方图，并保留了整合成分的中值。因此，对比度和饱和度得到改善，而主观图像质量也得到改善。此外，我们确认增强图像的色调分量与原始图像的色调分量相似。我们还确认了增强图像完美地恢复了原始图像。我们的方法可以为数码摄影领域作为法律证据做出贡献。考虑到我们的方法能够在增强一幅图像之前和之后创建彩色图像，可以减少彩色图像所需的存储空间以及与证据管理相关的问题。
In recent years, several reversible contrast-enhancement methods for color images using digital watermarking have been proposed. These methods can restore an original image from a contrast-enhanced image, in which the information required to recover the original image is embedded with other payloads. In these methods, the hue component after enhancement is similar to that of the original image. However, the saturation of the image after enhancement is significantly lower than that of the original image, and the obtained image exhibits a pale color tone. Herein, we propose a method for enhancing the contrast and saturation of color images and nearly preserving the hue component in a reversible manner. Our method integrates red, green, and blue histograms and preserves the median value of the integrated components. Consequently, the contrast and saturation improved, whereas the subjective image quality improved. In addition, we confirmed that the hue component of the enhanced image is similar to that of the original image. We also confirmed that the original image was perfectly restored from the enhanced image. Our method can contribute to the field of digital photography as a legal evidence. The required storage space for color images and issues pertaining to evidence management can be reduced considering our method enables the creation of color images before and after the enhancement of one image.