Showing 1-25 of 10,011 resultsfor "Index Terms":Low Spatial Frequency
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Frequency Diverse Array Beampattern Synthesis With Modified Sinusoidal Frequency Offset
Frequency diversity array (FDA) has been widely studied due to its nature of range-angle-dependent. However, the basic FDA generates an S-shaped range-angle coupled beampattern, which limits its application in target detection and localization. Recently, the FDA with sinusoidal frequency offset (Sin-FDA) has been proposed, which provides a narrow pencil beampattern, but at the cost of high sidelob...Show More
Phase Retrieval Algorithm Based on Transport of Intensity Equation under the Fusion of Regularization and Grating Modulation
Hong Cheng;Tianyi Zhang;Wentong Wu;Meng Kong;Si Cheng;Hanping Ju
2024 3rd International Conference on Image Processing and Media Computing (ICIPMC)
Year: 2024 | Conference Paper |
In the quantitative phase retrieval method based on transport of intensity equation, due to the significant amplification of low spatial frequency information caused by the Poisson reversal process, there is a problem of amplifying low-frequency noise, which leads to blurring of the final low-frequency phase results.In this paper, a new approach to the transport of intensity equation phase retriev...Show More
Spatial Frequency Modulation for Display-Camera Communication
2021 International Conference on Electronics, Information, and Communication (ICEIC)
Year: 2021 | Conference Paper |
Display-camera communication (DCC) is one of visible light communication (VLC) techniques using an LED display and a camera. Conventional methods hide data bits by dynamically changing luminance intensity of image blocks. However, this approach still suffers from noticeable flickering artifacts. In this paper, we proposed a novel spatial frequency modulation method for display-camera communication...Show More
This study attempts to analyze and design multi-agent systems in the spatial frequency domain and demonstrates that the spatial frequency-based approach is useful for distributed spatial filtering in sensor networks. First, we take the consensus of multi-agent systems (i.e., letting the states of all agents converge to an identical value) as an example and analyze it using the concept of spatial f...Show More
Progressive Spatial-Frequency Domain Fusion for Low-Light Image Enhancement
2024 6th International Conference on Frontier Technologies of Information and Computer (ICFTIC)
Year: 2024 | Conference Paper |
Images captured in low-light conditions often suffer from insufficient luminance, detail loss, and increased noise, which negatively affects both visual quality and the performance of downstream visual tasks. Existing low-light image enhancement methods typically perform pixel-level adjustments in the spatial domain or or follow a multi-stage approach, where global adjustments are made in the freq...Show More
Spatial Resolution Improvement in OFDR Using Four Wave Mixing and DSB-SC Modulation
IEEE Photonics Technology Letters
Cited by: Papers (15)
Spatial resolution in optical frequency domain reflectometry (OFDR) is a function of frequency sweep span. In this letter, a new method to enhance OFDR spatial resolution is proposed, by increasing the applied sweep span. The proposed method uses degenerated four wave mixing (FWM) with only a single light source, and this results in a preserved coherence length. The double sideband with suppress c...Show More
Image Lightness Conversion and Sharpening Taking Account of Visual Features of Elderly Person
Daiki Moriyama;Chiaki Ueda;Tadahiro Azetsu;Noriaki Suetake;Eiji Uchino
2019 IEEE International Conference on Image Processing (ICIP)
Year: 2019 | Conference Paper |
Cited by: Papers (1)
The performance of human visual functions degrades with age. For example, the visual field becomes dark owing to a decrease of the amount of light received. Moreover, objects appear to be hazy by a decrease in the contrast sensitivity. In particular, the contrast sensitivity decreases remarkably as the spatial frequency increases. In this paper, we propose an image enhancement method which consist...Show More
Efficient-USR: Prompt Guided Dual-Domain Feature Information for Efficient Underwater Image Super-Resolution
ICASSP 2025 - 2025 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)
Year: 2025 | Conference Paper |
Recent advances in deep learning have significantly improved underwater image super-resolution (UISR) performance. However, their large and complex architectures result in huge computational complexity, making them unsuitable for low-power devices such as autonomous underwater vehicles (AUVs) and remotely operated vehicles (ROVs). In addition, current research emphasizes designing deep models to e...Show More
Impacts of Grating Frequency on Super Resolution via Structured Illumination Microscopy
SoutheastCon 2018
Year: 2018 | Conference Paper |
Besides the well-established limit of about 2 times beyond the diffraction limit, the super resolution imaging using structured illumination microscopy method also depends critically on the grating frequency used for the structured illumination patterns. The exact nature of this dependence was not well-understood. We systemically investigated the impacts of the grating frequency using numerical si...Show More
Multispectral Pansharpening by Extracting Local Coefficients Based on WT Concept and MTF of Multispectral Sensors
2020 28th Iranian Conference on Electrical Engineering (ICEE)
Year: 2020 | Conference Paper |
In order to increase the spatial resolution of the multispectral images, the fusion process is used that the high frequency spatial information of the panchromatic image is added to the multispectral image. In this paper, first, the panchromatic image of the histogram matching each multispectral image band and each multispectral image band interpolated to the panchromatic image scale was divided. ...Show More
Super-resolution for mixed-resolution multiview images using a relative frequency response estimation method
2015 Visual Communications and Image Processing (VCIP)
Year: 2015 | Conference Paper |
In mixed-resolution multiview setups, spatially neighboring high-resolution views can be used to increase the image quality of an intermediate low-resolution camera perspective. By utilizing corresponding depth data, high-frequency information can be projected from the reference perspectives onto the image plane of the low-resolution view, creating the desired super-resolved image. In this context...Show More
Enhanced MC-EZBC Scalable Video Coder
In this paper, we provide some recent extensions to the scalable subband/wavelet video coder MC-EZBC. The enhanced MC-EZBC employs an adaptive motion-compensated temporal filter (MCTF) framework. Directional I-BLOCKs and overlapped block motion compensation (OBMC) further improve MCTF efficiency. A scalable motion vector coder based on CABAC is shown to improve the overall performance at low bitra...Show More
The theory of sub-gridding multiresolution time domain has been presented. It has been applied successfully to a two dimension empty cavity. The result has been compared with the traditional multiresolution time domain method (MRTD).Show More
Frequency Domain CSP for Foot Motor Imagery Classification Using SVM for BCI Application
2020 IEEE-EMBS Conference on Biomedical Engineering and Sciences (IECBES)
Year: 2021 | Conference Paper |
Cited by: Papers (2)
The primary requirement for developing a BCI-based foot prosthetic for the lower limb amputation is to classify foot motor imagery through brain signals of both right and left limbs. It is necessary to effectively and accurately recognize the lower limb motor imagery through Electroencephalogram (EEG) signals as quickly as possible with the best possible combination of feature extraction and class...Show More
Reducing noise in high-resolution video sequences by using wavelet shrinkage in the temporal-spatial domain
Yasutaka Matsuo;Yukikiro Nishida;Seiichi Gohshi;Shin-ichi Sakaida
A novel method for reducing video noise by using wavelet shrinkage in the temporal-spatial domain was devised and evaluated. In a temporal-spatial wavelet transform, static areas in a picture appear in a temporal low-frequency sub-band. In regards to this sub-band, the wavelet shrinkage can use a high threshold value in a shrinkage function and attains good noise-reduction performance. On the othe...Show More
Effects of spatial frequency on audiovisual integration for communication between human and robot
Fengxia Wu;Xiaoyu Tang;Weiping Yang;Ejima Yoshimichi;Qiong Wu;Yanna Ren;Takanori Ohara;Satoshi Takahashi;Jinglong Wu
2016 IEEE International Conference on Mechatronics and Automation
Year: 2016 | Conference Paper |
Combing audiovisual signals across modalities can facilitate human perception when communicate with each other in a noisy environment, but robot can't realize communication with human in a complex environment. Recent studies showed that audiovisual integration effects occurred for low intensity visual inputs, and whether visual spatial frequency can influence audiovisual integration is unclear. In...Show More
Dual-Stream Adaptive Convergent Low-Light Image Enhancement Network Based on Frequency Perception
Low-light image enhancement is a crucial area of research in computer vision, aimed at recovering normally exposed images from low-light images to facilitate high-level vision tasks such as target detection, tracking, and recognition. However, the convolutional neural networks commonly used in this field have a bias towards extracting low-frequency local structural features in the spatial domain, ...Show More
Unintelligible Low-Frequency Sound Enhances Simulated Cochlear-Implant Speech Recognition in Noise
Speech can be recognized by multiple acoustic cues in both frequency and time domains. These acoustic cues are often thought to be redundant. One example is the low-frequency sound component below 300 Hz, which is not even transmitted by the majority of communication devices including telephones. Here, we showed that this low-frequency sound component, although unintelligible when presented alone,...Show More
Self-Modulated Halftones
2006 International Conference on Image Processing
Year: 2006 | Conference Paper |
We propose an analytic method to overcome the trade-off between the spatial and tonal resolution of traditional clustered dot halftones. Continuous phase modulated halftones that allow variations in screen frequency in different regions of the printed image are employed and halftone screen frequency is varied according to the frequency content of the image to be halftoned. The method, which we ter...Show More
Pansharpening Quality Assessment using Modulation Transfer Function Filters
IGARSS 2008 - 2008 IEEE International Geoscience and Remote Sensing Symposium
Year: 2008 | Conference Paper |
Cited by: Papers (3)
Quality assessment of pansharpening methods is not a trivial task. The generally used indexes i.e., Q4, SAM and ERGAS require a reference image at the same resolution as the fused image. Since, this reference image is not available the quality of pansharpening algorithms is tested at degraded resolution. However, this does not provide the means to assess the quality of fused images at the desired ...Show More
Frequency Response Model and Its Closed-Form Solution of Two-Machine Equivalent Power System
Jiakai Shen;Weidong Li;Liu Liu;Cuicui Jin;Kerui Wen;Xiangxu Wang
For the purpose of considering the spatial-temporal characteristics (STC) of large-scale interconnected power system in the modeling, calculation, and analysis of dynamic frequency response (FR), this paper establishes a two-machine equivalent frequency response (TEFR) model and gets its closed-form solution (CFS), which can be used to analytically analysis and fast calculation. In the modeling, t...Show More
Self-organizing feature map with position information and spatial frequency information
Neural Networks for Signal Processing III - Proceedings of the 1993 IEEE-SP Workshop
Year: 1993 | Conference Paper |
Cited by: Patents (3)
The representation of scale - position information of local features in images is discussed. A feature map is proposed on which scale information is represented in position explicitly in the same manner of position information. The result of a computer simulation to self-organize such a feature map by using a retina-like filter set in the case of one-dimensional input data is shown. This feature m...Show More
CFBC: A Network for EEG Emotion Recognition by Selecting the Information of Crucial Frequency Bands
Mu Zhu;Zhongli Bai;Qingzhou Wu;Junchi Wang;Wenhui Xu;Yu Song;Qiang Gao
In this work, inspired by the frequency band division theory of electroencephalogram (EEG) signals, we propose the crucial frequency band convolution (CFBC) network method to explore the crucial frequency range of frequency domain features. CFBC includes two parts: spatial feature extractor and crucial frequency band selector. First, we extracted differential entropy (DE) and power spectral densit...Show More
Pansharpening via Frequency-Aware Fusion Network With Explicit Similarity Constraints
The process of fusing a high spatial resolution (HR) panchromatic (PAN) image and a low spatial resolution (LR) multispectral (MS) image to obtain an HRMS image is known as pansharpening. With the development of convolutional neural networks (CNNs), the performance of pansharpening methods has been improved; however, blurry effects and spectral distortion still exist in their fusion results due to...Show More
Laterality Effect on Visual Orientation Processing: An Event-Related Potential Study
Fengxia Wu;Yanna Ren;Jinglong Wu;Meng Wang;Chang Qu;Jingjing Yang
2023 17th International Conference on Complex Medical Engineering (CME)
Year: 2023 | Conference Paper |
Although previous studies have demonstrated visual spatial frequency processing in human, how orientation discrimination alter visual spatial frequency processing in temporal mechanism has not yet been elucidated completely. To investigate this, we design to performing a classical perceptual tasks of grating orientation discrimination. Participants were told to identify the orientation of the stim...Show More
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