テレビやパソコンにおける表示,プリンタによる印 刷などの画素密度が増加し,画像の解像度感が画質を 決めるポイントの一つになっている.これら出力機器 に対して画像データの画素が少ない場合,事前に信号 処理により画素を増やす高解像度化技術が必要となる. 従来の高解像度化技術としては,双一次内挿法,あ るいは三次畳込み内挿法 [1]~[3]など標本化定理に基 づく補間フィルタを用いることが多かった.しかし, これらの手法では画素が増えた画像で表現が可能にな る高い周波数成分は生成されず,出力画像はぼやけた ものになってしまう.そこで,補間フィルタの改良が 検討され [4], [5],例えば,Kim らは,Winscale とい う面積画素モデルに基づく手法を提案した [6].簡単な 処理で最近傍内挿と双一次内挿の性質を併せもつ拡大 を行うが,高い解像度感は得られない.また,エッジ 適応型内...

The problem of super-resolution involves generating feasible higher resolution images, which are pleasing to the eye and realistic, from a given low resolution image. This might be attempted by using simple filters for smoothing out the high resolution blocks or through applications where substantial prior information is used to imply the textures and shapes which will occur in the images. In t...

In this paper we study the identification of a time-varying linear system from its response to a known input signal. More specifically, we consider systems whose response to the input signal is given by a weighted superposition of delayed and Doppler shifted versions of the input. This problem arises in a multitude of applications such as wireless communications and radar imaging. Due to practi...

We give a method for improving the resolution of surfaces captured with a laser range scanner by combining many very similar scans. This idea is an application of the 2D image processing technique known as superresolution. The input lower-resolution scans are each randomly shifted, so that each one contributes slightly different information to the final model. Noise is reduced by averaging the ...

A large number of image super resolution algorithms based on the sparse coding are proposed, and some algorithms realize the multi-frame super resolution. In multi-frame super resolution based on the sparse coding, both accurate image registration and sparse coding are required. Previous study on multi-frame super resolution based on sparse coding firstly apply block matching for image registra...

Due to the long imaging times in SPECT, patient motion is inevitable and constitutes a serious problem for any reconstruction algorithm. The measured inconsistent projection data lead to reconstruction artifacts which can significantly affect the diagnostic accuracy of SPECT if not corrected. Among the most promising attempts for addressing this cause of artifacts is the so-called data-driven m...

In this paper we propose a novel method that performs 3D face reconstruction, and non-constrained and non-contact gaze estimation on a moving object, whose head-pose can freely change, from multi-view video. The main idea is to first reconstruct the 3D face with high accuracy using symmetry prior. Then we generate a super-resolution virtual frontal face video from the estimated 3D face geometry...