The current paper proposes recognition of partially invisible objects in images using image enhancement techniques. The problem mainly arises in night vision images which comprise poor contrast standards. Also during daytime, the object which is captured under sunlight is the lone survivor and the rest of information is not captured by camera properly. Image enhancement techniques to improve visual quality have been popularized with the proliferation of digital imagery and computers. Histogram Equalization (HE) is a versatile image improvement technique that can be incorporated for converting the partial visible objects/invisible objects into a proper vision. Further for enriching the information in image obtained by the HE image, a Contrast Limited Adaptive Histogram Equalization (CLAHE) is incorporated and finally for smoothing purpose, the image thus obtained is passed through a Gaussian filter. Results on various set of images show that above two techniques HE and CLAHE along with a Gaussian filter significantly improve the quality of image and hence assist to discover the partially visible/invisible objects.

Viola tricolor L (family: Violaceae) commonly known as wild pansy, heartsease exhibited various pharmacological effects such as cytotoxic activity, antimicrobial, anti-inflammatory, antioxidant, sedative, immunosuppressive, anti-anxiety, and anticonvulsant activity. Polysaccharides, flavonoids, phenylcarbonic acids, salicylic acid derivatives, catechins, and coumarins are all known to be present in Viola tricolor. The aim of the present study was to perform the preliminary phytochemical screening and to estimate total phenols and total flavonoids in Viola tricolor aerial parts. The aerial components of V. tricolor were extracted successively in order of increasing polarity using solvents such as petroleum ether, chloroform, methanol, and water. Phytochemical studies of V. tricolor confirmed the presence of phenols and flavonoids in chloroform, methanolic, and aqueous extract. A spectrophotometric technique based on Folin-Ciocalteau reagents and an aluminium chloride colorimetric test was used to determine the amount of total phenols and flavonoids in chloroform, methanolic, and aqueous extracts. Total phenols were measured using gallic acid as standard, while total flavonoids were measured using quercetin as standard. Total phenolic content (%w/w) were found to be 8.00±0.503, 14.84±0.298, and 2.93±0.232 in chloroform, methanolic, and aqueous extract of V. tricolor respectively. Total flavonoid content (%w/w) were found to be 3.09±0.113, 6.24±0.279, and 2.00±0.166 in chloroform, methanolic, and aqueous extract of V. tricolor respectively.