Thermal Image Enhancement Techniques Using Histograms for Better Visualization of the Larynx and Vocal Folds

The noncontact localization of the vocal fold holds significant importance in intubation. Thermal cameras can aid in identifying potential issues and guiding the placement of the endotracheal tube during intubation by visually displaying temperature variations. This research paper primarily explores various image enhancement techniques, specifically those that employ histogram manipulation. The methods under investigation encompass Contrast Limited Adaptive Histogram Equalization, Adaptive Histogram Equalization and Brightness Histogram Equalization. The central objective of this study is to assess the efficacy of these image enhancement techniques in improving the visibility and clarity of vocal fold images. Laryngoscopy is pivotal in medical procedures to examine and treat the larynx and throat. Laryngoscopy involves using a slender instrument known as a laryngoscope to visualize the internal structures of the larynx and throat. These image enhancement methods find valuable applications in optical and video laryngoscopy, aiding healthcare providers in achieving clearer and more precise visualization of the laryngeal and vocal cord regions.