A5067172615- Cryptography and Data Security
- Cryptography and Residue Arithmetic
- Advanced Optical Sensing Technologies
- Image Processing Techniques and Applications
- Advanced Vision and Imaging
- Coding theory and cryptography
- Optical measurement and interference techniques
- Image Enhancement Techniques
- Image and Signal Denoising Methods
- Advanced Image Processing Techniques
- CCD and CMOS Imaging Sensors
- Complexity and Algorithms in Graphs
- Advanced Image Fusion Techniques
- Advanced Optical Imaging Technologies
- Image and Video Stabilization
- Color Science and Applications
- Cryptographic Implementations and Security
- Remote Sensing and LiDAR Applications
- Advanced optical system design
- Infrared Target Detection Methodologies
- Video Surveillance and Tracking Methods
- Algebraic Geometry and Number Theory
- Advanced Memory and Neural Computing
- Advancements in PLL and VCO Technologies
- Face recognition and analysis
Samsung (South Korea)
2008-2025
NTT (Japan)
2015-2020
Musashino University
2020
Seoul National University
2013-2014
National Institute for Mathematical Sciences
2014
Homomorphic Encryption (HE) is a cryptosytem that allows us to perform an arbitrary computation on encrypted data. The standard HE, however, has disadvantage in the authority concentrated secret key owner since computations can only be performed ciphertexts under same key. To resolve this issue, research underway Multi-Key (MKHE), which variant of HE supporting possibly different keys. Despite its ability provide privacy for multiple parties, existing MKHE schemes suffer from poor...
As pixel size of image sensors shrinks down rapidly, we are reaching technical barrier to get the required low light performance. In this paper, recent advanced technologies such as backside illumination, new color filter array, F-number with extended depth field technologies, etc. introduced overcome a barrier. It is shown that integration these sensor can make shrink toward 1.0 mum
We have developed an imaging system comprised of a sensor having White-RGB color filter array and back end image processing chain (IPC) that enables seamless integration with existing solutions. The key components our are 5 megapixel, 1.4um pixel CMOS covered by hardware-friendly algorithm which is responsible for conversion native data stream into Bayer RGB capable to do sharpening noise suppression simultaneously. show solution provides artifact free images outperforms alternative...
In this paper, a novel image enhancement system for wide-angle lens camera is presented. The proposed consists of; i) distortion correction using space-varying interpolation kernels and ii) restoration based on the local self-similarity. process geometric produced by results in radial artifacts caused non-linear resampling. To reduce such artifacts, algorithm uses derived from calibration data. corrected further enhanced self-example-based restoration. Experimental demonstrate method can...
The Tate pairing computation consists of two parts: Miller step and final exponentiation step. In this paper, we investigate the structure Consider an order <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">r</i> subgroup elliptic curve defined over F <sub xmlns:xlink="http://www.w3.org/1999/xlink">q</sub> with embedding degree xmlns:xlink="http://www.w3.org/1999/xlink">k</i> . in is element <sup xmlns:xlink="http://www.w3.org/1999/xlink">k</sup> by...
This paper presents a novel real-time super-resolution (SR) method using directionally adaptive image interpolation and restoration. The proposed estimates the edge orientation steerable filters performs refinement along estimated orientation. Bi-linear bi-cubic are then selectively used according to for reducing jagging artifacts in slanting regions. restoration can effectively remove degradation caused by truncated constrained least-squares (TCLS) filter. provides high-quality magnified...
An algorithm to recognize four degrees of freedom gesture by using event-based image sensor is developed. The motion includes three translations and one rotation. Each pixel the produces an event when temporal intensity change larger than a pre-defined value. From time-stamps events, map pseudo optical flow calculated. proposed achieves recognition based on this flow. It provides not only directions but also magnitudes velocity. memory-wise computationally efficient because it uses current...
This article presents several wide dynamic range (WDR) technologies for CMOS image sensors. In photography, is the between maximum and minimum measurable light intensities. The varying degree of intensity depends on device that used as a capture device, which decides overall performance an imaging sensor. WDR technology increases sensor by physically improving pixel or digitally applying multiple exposure times each pixel. enables users to easily take picture in case backlit, indoor, tunnel...
The aim of the discrete logarithm problem with auxiliary inputs is to solve for ${\it\alpha}$ , given elements $g,g^{{\it\alpha}},\ldots ,g^{{\it\alpha}^{d}}$ a cyclic group $G=\langle g\rangle$ prime order $p$ . best-known algorithm, proposed by Cheon in 2006, solves case where $d\mid (p\pm 1)$ running time $O(\sqrt{p/d}+d^{i})$ exponentiations ( $i=1$ or $1/2$ depending on sign). There have been several attempts generalize this algorithm ${\rm\Phi}_{k}(p)$ $k\geqslant 3$ However, it has...
To enhance design productivity, we propose a methodology for automatic RTL generation of timing control block from user defined specification. We also provide error detector to reduce human on specification shorten time. Experimental result shows that can overall time by 70% while keeping area overhead lower than 5%, compared manually optimized design.
A novel white point estimation method is presented for automatic balance (AWB). The proposed first detects points by estimating dark channel prior information in the input image, and then adjusts on detected points. Experimental results indicate that produces visually-correct color representation most test images.
This paper proposes two-layer color filter array to obtain a high quality image and demosaic algorithms interpolate the proposed array. Although design methods have been improved together, recent research results shown performance saturation since sub-sampling of channels is inevitable. To overcome this limitation, multilayer arrays developed two or three data at single pixel position. one array, which has full resolution in G channel half R/B channel. evaluate performance, simple are...
We propose an image stretching method by fusing multi-transformed images. Instead of multiple exposed images for the HDR imaging, proposed generates differently stretched from a single and blends them to increase perceptual dynamic range while skipping acquisition avoiding motion blur.