A large number of remote video sensors are being deployed in the world to collect, store, and analyze the real-world data. Since a remote video sensor produces very large data, the total amount of video data are extremely large in size, complexity, and capacity. Important events from a remote video sensor are closely related to a motion in video. We present, in this paper, a fast motion detection method based on the number of bits used for encoding a video stream and the GOP-level motion detection. A low complexity measurement of the number of bits is performed in the coded video sequence and then, we store and process the coded video stream only if the total bits are larger than a pre-defined threshold. We also use a GOP level motion detection to reduce processing overhead compared to the conventional motion vector-based approach which processes every frame. Manipulating the number of bits is itself a much easier task than full reconstruction of each pixel of a video frame and it can save storage cost because it only stores a coded video sequence with a motion. The proposed method also contributes to reduction of computational complexity compared to the manipulation of motion vectors per 4x4 macro block. To evaluate our method, we deployed a centralized single server connected to H.264 capable remote video sensors. Results on the video sequences showed that the proposed approach can process more video sequences than the conventional compressed domain approach.
Forward Looking InfraRed (FLIR) imaging system has been widely used for both military and civilian purposes.
Military applications include target acquisition and tracking, night vision system. Civilian applications include thermal
efficiency analysis, short-ranged wireless communication, weather forecasting and other various applications. The
dynamic range of FLIR imaging system is larger than one of commercial display. Generally, auto gain controlling and
contrast enhancement algorithm are applied to FLIR imaging system. In IR imaging system, histogram equalization and
plateau equalization is generally used for contrast enhancement. However, they have no solution about the excessive
enhancing when luminance histogram has been distributed in specific narrow region. In this paper, we proposed a
Regional Density Distribution based Wide Dynamic Range algorithm for Infrared Camera Systems. Depending on the
way of implementation, the result of WDR is quite different. Our approach is single frame type WDR algorithm for
enhancing the contrast of both dark and white detail without loss of bins of histogram with real-time processing. The
significant change in luminance caused by conventional contrast enhancement methods may introduce luminance
saturation and failure in object tracking. Proposed method guarantees both the effective enhancing in contrast and
successive object tracking. Moreover, since proposed method does not using multiple images on WDR, computation
complexity might be significantly reduced in software / hardware implementation. The experimental results show that
proposed method has better performance compared with conventional Contrast enhancement methods.
In biomedical application study using phase contrast X-ray, both sample thickness or density and absorption difference
are very important factors in aspects of contrast enhancement. We present experimental evidence that synchrotron hard
X-ray are suitable for radiological imaging of biological samples down to the cellular level. We investigated the potential
of refractive index radiology using un-monochromatized synchrotron hard X-rays for the imaging of cell and tissue in
Material had been adopted various medical field, such as apoE knockout mouse in cardiologic field, specimen from renal
and prostatic carcinoma patient in urology, basal cell epithelioma in dermatology, brain tissue from autosy sample of
pakinson's disease, artificially induced artilrtis tissue from rabbits and extracted tooth from patients of crack tooth
syndrome. Formalin and paraffin fixed tissue blocks were cut in 3 mm thickness for the X-ray radiographic imaging.
From adjacent areas, 4 μm thickness sections were also prepared for hematoxylin-eosin staining. Radiographic images of
dissected tissues were obtained using the hard X-rays from the 7B2 beamline of the Pohang Light Source (PLS). The
technique used for the study was the phase contrast images were compared with the optical microscopic images of
corresponding histological slides. Radiographic images of various diseased tissues showed clear histological details of
organelles in normal tissues. Most of cancerous lesions were well differentiated from adjacent normal tissues and
detailed histological features of each tumor were clearly identified. Also normal microstructures were identifiable by the
phase contrast imaging. Tissue in cancer or other disease showed clearly different findings from those of surrounding
normal tissue. For the first time we successfully demonstrated that synchrotron hard X-rays can be used for radiological
imaging of relatively thick tissue samples with great histological details.
Living skin for basic and clinical research can be evaluated by Confocal Laser Scanning Microscope (CLSM) non-invasively.
CLSM imaging system can achieve skin image its native state either "in vivo" or "fresh biopsy (ex
vivo)" without fixation, sectioning and staining that is necessary for routine histology. This study examines the potential
fluorescent CLSM with a various exogenous fluorescent contrast agent, to provide with more resolution images in skin.
In addition, in vivo fluorescent CLSM researchers will be extended a range of potential clinical application. The
prototype of our CLSM system has been developed by Prof. Gweon's group. The operating parameters are composed of
some units, such as illuminated wavelength 488 nm, argon illumination power up to 20mW on the skin, objective lens,
0.9NA oil immersion, axial resolution 1.0μm, field of view 200μm x 100μm (lateral resolution , 0.3μm). In human
volunteer, fluorescein sodium was administrated topically and intradermally. Animal studies were done in GFP
transgenic mouse, IRC mouse and pig skin. For imaging of animal skin, fluorescein sodium, acridine orange, and
curcumine were used for fluorescein contrast agent. We also used the GFP transgenic mouse for fluorescein CLSM
imaging. In intact skin, absorption of fluorescein sodium by individual corneocyte and hair. Intradermal administrated
the fluorescein sodium, distinct outline of keratinocyte cell border could be seen. Curcumin is a yellow food dye that has
similar fluorescent properties to fluorescein sodium. Acridin Orange can be highlight nuclei in viable keratinocyte. In
vivo CLSM of transgenic GFP mouse enable on in vivo, high resolution view of GFP expressing skin tissue. GFP signals
are brightest in corneocyte, kertinocyte, hair and eccrine gland. In intact skin, absorption of fluorescein sodium by
individual corneocyte and hair. Intradermal administrated the fluorescein sodium, distinct outline of keratinocyte cell
border could be seen. In papillary dermis, fluorescein distribution is more homogeneous. Curcumin is a yellow food dye
that has similar fluorescent properties to fluorescein sodium. In vivo CLSM of transgenic GFP mouse enable on in vivo,
high resolution view of GFP expressing skin tissue. GFP signals are brightest in corneocyte, kertinocyte, skin appendage
and blood vessels. In conclusion, this study demonstrates the usefulness of CLSM as technique for imaging skin in vivo.
In addition, CLSM is non-invasive, the same tissue site may be imaged over a period of time to monitor the various
change such as wound healing, severity of skin diseases and effect of therapeutic management.