This paper reviews the second challenge on spectral reconstruction from RGB images, i.e., the recovery of wholescene hyperspectral (HS) information from a 3-channel RGB image. As in the previous challenge, two tracks were provided: (i) a "Clean" track where HS images are estimated from noise-free RGBs, the RGB images are themselves calculated numerically using the ground-truth HS images and supplied spectral sensitivity functions (ii) a "Real World" track, simulating capture by an uncalibrated and unknown camera, where the HS images are recovered from noisy JPEG-compressed RGB images. A new, larger-than-ever, natural hyperspectral image data set is presented, containing a total of 510 HS images. The Clean and Real World tracks had 103 and 78 registered participants respectively, with 14 teams competing in the final testing phase. A description of the proposed methods, alongside their challenge scores and an extensive evaluation of top performing methods is also provided. They gauge the state-of-the-art in spectral reconstruction from an RGB image.

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Background:Fine-needle aspiration cytology (FNAC) has been used as a diagnostic tool in evaluating suspected lesions. It shows a high diagnostic accuracy for diagnosing salivary gland lesions.Aim:The aim of this study was to highlight FNAC as an effective diagnostic tool in the presumptive diagnosis of ameloblastoma.Materials and Methods:A total of 12 cases of ameloblastoma sampled by FNAC retrieved from the archives of the Oral Pathology Department were retrospectively studied. The smears were alcohol-fixed and stained with hematoxylin and eosin. All the 12 cases of FNAC had subsequent corresponding surgical incisional biopsy or excision specimens.Results:Cytologically, seven cases were diagnosed as benign odontogenic tumor more in favor of ameloblastoma. All the 12 fine-needle aspiration cases were given a histopathologic work-up and diagnosed as ameloblastomas. Of these, the seven cytologically diagnosed benign odontogenic lesions were also confirmed to be ameloblastoma by both incisional biopsy as well as surgical excision.Conclusion:It was deduced from the above results that FNAC helps potentially in diagnosing ameloblastoma.

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