Endoscopic image quality plays an important role in the diagnosis of early lesions and dysplasia. Therefore, a blood vessel enhancement algorithm based on spectral absorption characteristics of blood vessels is proposed in this paper. First of all, RGB channels are obtained from the color image and divided into the brightness layer with the high dynamic range and the detail layer with the detail image information through the guided filter. Then, the detail layer of each channel is adaptively enhanced based on SNR (signal noise ratio), and the brightness layer is stretched to improve the GB channel information and to reduce R channel information. Finally each channel is merged to generate an enhanced image. In this article, a large number of endoscopic images is applied to this algorithm and compared with Karl Stroz's Spectra B enhancement technology. This method performs better in image enhancements while using the Detail Variance-Background Variance index and the Weber contrast index to evaluate.
A vascular enhancement algorithm for endoscope image
First published at:Jan 01, 2019
1 Li B P, Meng Max Q H. Wireless capsule endoscopy images enhancement via adaptive contrast diffusion[J]. Journal of Visual Communication and Image Representation, 2012, 23(1): 222-228. DOI:10.1016/j.jvcir.2011.10.002
2 Gono K. Narrow band imaging: technology basis and research and development history[J]. Clinical Endoscopy, 2015, 48(6): 476-480. DOI:10.5946/ce.2015.48.6.476
3 Togashi K, Osawa H, Koinuma K, et al. A comparison of conventional endoscopy, chromoendoscopy, and the optimal-band imaging system for the differentiation of neoplastic and non-neoplastic colonic polyps[J]. Gastrointestinal Endoscopy, 2009, 69(3): 734-741. DOI:10.1016/j.gie.2008.10.063
4 Kamphuis G M, de Bruin D M, Fallert T, et al. Storz professional image enhancement system: a new technique to improve endoscopic bladder imaging[J]. Journal of Cancer Science & Therapy, 2016, 8(3): 71-77.
5 Okuhata H, Nakamura H, Hara S, et al. Application of the real-time Retinex image enhancement for endoscopic images[C]//Proceedings of the 2013 35th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, 2013: 3407-3410.
6 Gopi V P, Palanisamy P. Capsule endoscopic image denoising based on double density dual tree complex wavelet transform[J]. International Journal of Imaging and Robotics, 2013, 9(1): 48-60.
7 Imtiaz M S, Mohammed S K, Deeba F, et al. Tri-Scan: A three stage color enhancement tool for endoscopic images[J]. Journal of Medical Systems, 2017, 41(6): 102. DOI:10.1007/s10916-017-0738-z
8 Du Le V N, Wang Q Z, Gould T, et al. Vascular contrast in narrow-band and white light imaging[J]. Applied Optics, 2014, 53(18): 4061-4071. DOI:10.1364/AO.53.004061
9 Noorden G K V. The Theory of Binocular Vision[J]. American Journal of Ophthalmology, 1977, 84(5):751-751.
10 Xu H L, Chen Q, Gu G H, et al. High dynamic range image enhancement technology based on guided image filter[J]. Infrared and Laser Engineering, 2015, 44(12): 3843-3849. DOI:10.3969/j.issn.1007-2276.2015.12.058
许轰烈, 陈钱, 顾国华, 等.利用导向滤波的宽动态范围图像增强技术[J].红外与激光工程, 2015, 44(12): 3843-3849. DOI:10.3969/j.issn.1007-2276.2015.12.058
11 Ghimire D, Lee J. Nonlinear transfer function-based local approach for color image enhancement[J]. IEEE Transactions on Consumer Electronics, 2011, 57(2): 858-865. DOI:10.1109/TCE.2011.5955233
12 Gono K, Obi T, Yamaguchi M, et al. Appearance of enhanced tissue features in narrow-band endoscopic imaging[J]. Journal of Biomedical Optics, 2004, 9(3): 568-577. DOI:10.1117/1.1695563
Supported by the National Key Research and Development Program of China (2017YFC0109603), Key Research and Development Plan of Zhejiang Province (2018C03064), and the Fundamental Research Funds for the Central Universities (2017QNA5003)
Get Citation: Jiang Hongpeng, Zhang Kejian, Yuan Bo, et al. A vascular enhancement algorithm for endoscope image[J]. Opto-Electronic Engineering, 2019, 46(1): 180167.
Previous: The study of the methods for evaluating the matching rate of capsule endoscope pixels and its resolution effectiveness