Subacute Combined Degeneration of the Spinal Cord Lee, Woan Jia; Poon, Yoke Chen; Chuah, Joo Hong ...
The American journal of medicine,
December 2020, 2020-12-00, 20201201, Letnik:
133, Številka:
12
Journal Article
Display omitted
•A pipeline approach to increase contrast and restore vividness to colour images.•Pre-processing procedures include colour stretching, and histogram equalization.•A magnitude ...compression and a saturation maximization stage as post processing.•Image content based feedback provides optimal compression to reduce artefacts.•Comprehensive assessment shows improvements on contrast and colour vividness.
Many vision based applications depend on images with sufficiently high contrast and colourfulness so that ample amount of information is available to accurately describe objects captured in an image scene. Poor image capturing conditions are often unavoidable but can be compensated. Approaches based on intensity histogram equalization are popular to increase the information content within an image but over-enhancement often results in the production of unwanted artefacts. Furthermore, when constrained to only an intensity-based enhancement, insufficient enrichment on colourfulness and saturation is often observed. In order to address these limitations concurrently, a pipelined approach that incorporates a colour channel stretching process, a histogram equalization step, a magnitude compression procedure, and a saturation maximization stage is proposed. Quantitative and qualitative results obtained from experiments on a wide variety of natural scene images demonstrate the effectiveness of the proposed approach over other methods at reducing artefact while increasing image contrast and colourfulness.
Idiopathic Spontaneous Pneumomediastinum So, Stephen Ching-Tung; Chuah, Joo Hong; Lee, Woan Jia ...
The American journal of medicine,
08/2021, Letnik:
134, Številka:
8
Journal Article
The histogram equalization process is a simple yet efficient image contrast enhancement technique that generally produces satisfactory results. However, due to its design limitations, output images ...often experience a loss of fine details or contain unwanted viewing artefacts. One reason for such imperfection is a failure of some techniques to fully utilize the allowable intensity range in conveying the information captured from a scene. The proposed colour image enhancement technique introduced in this work aims at maximizing the information content within an image, whilst minimizing the presence of viewing artefacts and loss of details. This is achieved by weighting the input image and the interim equalized image recursively until the allowed intensity range is maximally covered. The proper weighting factor is optimally determined using the efficient golden section search algorithm. Experiments had been conducted on a large number of images captured under natural indoor and outdoor environment. Results showed that the proposed method is able to recover the largest amount of information as compared to other current approaches. The developed method also provides satisfactory performances in terms of image contrast, and sharpness.
Considering the world status of China, one would be concerned that Hong Kong is left with 32 more years, by 2047, to demonstrate how "one country, two systems" works, and to make the case that, by ...the time the 50-year period of "no change" promise for the Special Administrative Region expires, its people deserve a fair review of the arrangement of their future. Having endured 18 years of increasingly unpopular and ineffective government since 1997, citizens find little patience to delay full recognition of the root causes and engagement with the long-standing problems that weigh dangerously on the tipping point. In anticipation of the promised move to a fair and democratic political system, the community realises that they are now at a crossroads of whether to trust, to evade, to fight for, or to accept what will be allowed and given by the Beijing authority. Ordinary people have awakened to see a Hong Kong they never imagined plausible, in an endless process of Kafkaesque metamorphosis, whereby the core values and way of life are subject to the ultimate twist of logic, reason and normality. At this crucial juncture of history came the Umbrella Movement of 2014, the collective action of civil disobedience against the status quo that shocked the world. The 79-day occupy action has transformed the city, which can no longer be the same again. It would be pertinent to identify the cultural-political factors that precipitated the public discourse, to re-shuffle the power hierarchy, and to shape the social body that engenders the deep crisis of subjectivity among the local people.
A Hoarse Warning: Ortner Syndrome Sim, Meng Ying; Lim, Yong Chean; So, Stephen Ching-Tung ...
The American journal of medicine,
December 2018, 2018-12-00, 20181201, Letnik:
131, Številka:
12
Journal Article
Hong Kong Connections Meaghan Morris, Siu Leung LI and Stephen Chan Ching-kiu
2005, 20051001, 2006, 20050101
eBook
Since the 1960s, Hong Kong cinema has helped to shape one of the world's most popular cultural genres: action cinema. Hong Kong action films have proved popular over the decades with audiences ...worldwide, and they have seized the imaginations of filmmakers
Cardiovascular disease is a significant cause of morbidity and mortality in the developed world. 3D imaging of the heart's structure is critical to the understanding and treatment of cardiovascular ...disease. However, open-source tools for image analysis of cardiac images, particularly 3D echocardiographic (3DE) data, are limited. We describe the rationale, development, implementation, and application of SlicerHeart, a cardiac-focused toolkit for image analysis built upon 3D Slicer, an open-source image computing platform. We designed and implemented multiple Python scripted modules within 3D Slicer to import, register, and view 3DE data, including new code to volume render and crop 3DE. In addition, we developed dedicated workflows for the modeling and quantitative analysis of multi-modality image-derived heart models, including heart valves. Finally, we created and integrated new functionality to facilitate the planning of cardiac interventions and surgery. We demonstrate application of SlicerHeart to a diverse range of cardiovascular modeling and simulation including volume rendering of 3DE images, mitral valve modeling, transcatheter device modeling, and planning of complex surgical intervention such as cardiac baffle creation. SlicerHeart is an evolving open-source image processing platform based on 3D Slicer initiated to support the investigation and treatment of congenital heart disease. The technology in SlicerHeart provides a robust foundation for 3D image-based investigation in cardiovascular medicine.
Digital color images are capable of presenting hue, saturation, and brightness perceptions. Therefore, quality improvement of color images should be taken into account to enhance all three stimuli. ...An effective method is proposed that aims at enriching the colorfulness, vividness, and contrast of color images simultaneously. In this method, color correction based on magnitude stretching is carried out first, image enhancement is then derived from an intensity-guided operation that concurrently improves the contrast and saturation qualities. Furthermore, the proposed methodology mitigates the heavy computational burden arising from the need to transform the source color space into an alternative color space in conventional approaches. Experiments had been conducted using a collection of real-world images captured under various environmental conditions. Image quality improvements were observed both from subjective viewing and quantitative evaluation metrics in colorfulness, saturation, and contrast.
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