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The aims of this study were to evaluate the clinical feasibility of using an Electronic Portal Imaging Device (EPID) for patient position verification, and to analyze for the EPID's limiting factor in the use of patient setup verification. The investigation involves 15 patients with different carcinomas. All of them were initially positioned by using a three-point laser alignment method and received...
An autostereoscopic display using multiple miniature projectors array was developed to realize a 3D display system with both high resolution and large number of views. It is found that image distortion of the projection lens, alignment between the projector and the screen, and image blending among tiled images are the three critical technologies in such a system. This paper presents the researches...
In this study, a new video super-resolution (SR) reconstruction approach using a mobile search strategy and adaptive patch size is proposed. Based on the nonlocal-means (NLM) SR algorithm, the mobile strategy for search center and adaptive patch size are proposed to reduce the computational complexity and improve the visual quality, respectively. Based on the experimental results obtained in this...
Scalable Video Coding (SVC) is backwards compatible to H.264/AVC in the sense that the base layer sub-bitstream is decodable by an H.264/AVC decoder. However, there are applications wherein it is desirable for an H.264/AVC decoder to obtain a higher resolution video representation than the base layer within SVC. In order to fulfill the needs of such application scenarios, transcoding of SVC enhancement...
Spatial resolutions of IKONOS high-resolution panchromatic (PAN) and low-resolution multispectral (MS) satellite images are 1 m and 4 m, respectively. To cope with color distortion and blocking artifacts in fused images, in this study, a new IKONOS imagery fusion approach using particle swarm optimization (PSO) is proposed. The pixels of fused images in the training set are classified into several...
In asymmetric stereoscopic video coding, one view can be coded in a lower resolution of the other. In this scenario, stereoscopic video can be compressed with only moderately increased bandwidth and complexity compared to 2D monoview video coding. The subjective quality degradation of this scenario can be negligible compared to coding two views with original resolution. The low-resolution view can...
A concatenated model for video frame interpolation is presented in this paper. The algorithm involves warping a high resolution reference image in a way that preserves much of the high resolution detail in the sequence. The concatenated model incorporates adaptive bidirectional warping and has the flexibility to incorporate a variety of frame-based interpolation methods within the system. The concatenated...
In asymmetric stereoscopic video coding, one view is coded in a quarter of the resolution of the other and the low- resolution view is predicted from the high-resolution view. This way, stereoscopic video effect could be achieved with only moderately increased bandwidth and complexity. Inter-view prediction tools for generating the predictor of a maroblock (MB) or MB partition in the low-resolution...
In this study, a new edge-directed image interpolation approach using visual attention model and particle swarm optimization (PSO) is proposed. First, a high-quality saliency map of an image to be interpolated is generated by the proposed visual attention model in an effective manner. Then, based on the saliency map, bilinear interpolation and the proposed PSO interpolation are employed for non-saliency...
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