Academic Journal
Local Contrast-Based Pixel Ordering for Exact Histogram Specification
| العنوان: | Local Contrast-Based Pixel Ordering for Exact Histogram Specification |
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| المؤلفون: | Kohei Inoue, Naoki Ono, Kenji Hara |
| المصدر: | Journal of Imaging, Vol 8, Iss 9, p 247 (2022) |
| بيانات النشر: | MDPI AG, 2022. |
| سنة النشر: | 2022 |
| المجموعة: | LCC:Computer applications to medicine. Medical informatics LCC:Electronic computers. Computer science |
| مصطلحات موضوعية: | exact histogram equalization, exact histogram specification, Gaussian filter, contrast enhancement, pixel ordering, Photography, TR1-1050, Computer applications to medicine. Medical informatics, R858-859.7, Electronic computers. Computer science, QA75.5-76.95 |
| الوصف: | Histogram equalization is one of the basic image processing tasks for contrast enhancement, and its generalized version is histogram specification, which accepts arbitrary shapes of target histograms including uniform distributions for histogram equalization. It is well known that strictly ordered pixels in an image can be voted to any target histogram to achieve exact histogram specification. This paper proposes a method for ordering pixels in an image on the basis of the local contrast of each pixel, where a Gaussian filter without approximation is used to avoid the duplication of pixel values that disturbs the strict pixel ordering. The main idea of the proposed method is that the problem of pixel ordering is divided into small subproblems which can be solved separately, and then the results are merged into one sequence of all ordered pixels. Moreover, the proposed method is extended from grayscale images to color ones in a consistent manner. Experimental results show that the state-of-the-art histogram specification method occasionally produces false patterns, which are alleviated by the proposed method. Those results demonstrate the effectiveness of the proposed method for exact histogram specification. |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | English |
| تدمد: | 2313-433X |
| Relation: | https://www.mdpi.com/2313-433X/8/9/247; https://doaj.org/toc/2313-433X |
| DOI: | 10.3390/jimaging8090247 |
| URL الوصول: | https://doaj.org/article/ba2d3a00b0554cb6bccacce2a6a4c2b6 |
| رقم الانضمام: | edsdoj.ba2d3a00b0554cb6bccacce2a6a4c2b6 |
| قاعدة البيانات: | Directory of Open Access Journals |
Full Text Finder | تدمد: | 2313433X |
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| DOI: | 10.3390/jimaging8090247 |