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Atif Ahmed,Rehan Hafiz,Muhammad Murtaza Khan,조용주,차지훈 한국전자통신연구원 2013 ETRI Journal Vol.35 No.6
This paper presents a scheme for geometric correction of projected content for planar and quadratic projection surfaces. The scheme does not require the projection surface to be perfectly quadratic or planar and is therefore suitable for uneven low-cost commercial and home projection surfaces. An approach based on the recursive subdivision of second-order Bézier patches is proposed for the estimation of projection distortion owing to surface imperfections. Unlike existing schemes, the proposed scheme is completely automatic, requires no prior knowledge of the projection surface, and uses a single uncalibrated camera without requiring any physical markers on the projection surface. Furthermore, the scheme is scalable for geometric calibration of multiprojector setups. The efficacy of the proposed scheme is demonstrated using simulations and via practical experiments on various surfaces. A relative distortion error metric is also introduced that provides a quantitative measure of the suppression of geometric distortions, which occurs as the result of an imperfect projection surface.
Quality Assessment of Images Projected Using Multiple Projectors
( Muhammad Umer Kakli ),( Hassaan Saadat Qureshi ),( Muhammad Murtaza Khan ),( Rehan Hafiz ),( Yongju Cho ),( Unsang Park ) 한국인터넷정보학회 2015 KSII Transactions on Internet and Information Syst Vol.9 No.6
Multiple projectors with partially overlapping regions can be used to project a seamless image on a large projection surface. With the advent of high-resolution photography, such systems are gaining popularity. Experts set up such projection systems by subjectively identifying the types of errors induced by the system in the projected images and rectifying them by optimizing (correcting) the parameters associated with the system. This requires substantial time and effort, thus making it difficult to set up such systems. Moreover, comparing the performance of different multi-projector display (MPD) systems becomes difficult because of the subjective nature of evaluation. In this work, we present a framework to quantitatively determine the quality of an MPD system and any image projected using such a system. We have divided the quality assessment into geometric and photometric qualities. For geometric quality assessment, we use Feature Similarity Index (FSIM) and distance-based Scale Invariant Feature Transform (SIFT). For photometric quality assessment, we propose to use a measure incorporating Spectral Angle Mapper (SAM), Intensity Magnitude Ratio (IMR) and Perceptual Color Difference (ΔE). We have tested the proposed framework and demonstrated that it provides an acceptable method for both quantitative evaluation of MPD systems and estimation of the perceptual quality of any image projected by them.
Muhammad Modassar Ali Nawaz Ranjha,Bakhtawar Shafique,Lufeng Wang,Shafeeqa Irfan,Muhammad Naeem Safdar,Mian Anjum Murtaza,Muhammad Nadeem,Shahid Mahmood,Ghulam Mueen-ud-Din,Hafiz Rehan Nadeem 경희대학교 융합한의과학연구소 2023 Oriental Pharmacy and Experimental Medicine Vol.23 No.1
Pomegranate (Punica granatum) acts as a therapeutic fruit possessing different bioactive compounds. Different compartments of pomegranate (P. granatum) like seed, peel, juice and leaves are rich in potential bioactive compounds. Pomegranate contains sinapyl, coniferyl, ellagic acid, cinnamic acid, genistein, linoleic acid, anthocyanin, gallic acid, catechin, quercetin, rutin, kaempferol, cyanidin, punicalin, delphinidin, punicalagin, chlorogenic acid, coumaric acid, luteolin and pelletierine alkaloids, flavonoids, anthocyanin and caffeic acid. Pomegranate also exhibits significant anti-oxidative, anti-hypertensive, cardioprotective and anti-diabetic properties and anti-carcinogenic possessions including prevention of prostate cancer; reduction in colon inflammation, prevention of skin tumorigenesis, improvement in renal function and reduction in metastatic melanoma growth. This review summarizes the current available data on the phytochemistry, bioavailability and therapeutic importance of potential bioactive compounds of pomegranate.