Jen-Shiun Chiang

Jen-Shiun Chiang
Tamkang University · Department of Electrical Engineering

About

130
Publications
21,887
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1,046
Citations
Citations since 2017
19 Research Items
303 Citations
201720182019202020212022202301020304050
201720182019202020212022202301020304050
201720182019202020212022202301020304050
201720182019202020212022202301020304050
Additional affiliations
August 1992 - present
Tamkang University
Position
  • Professor (Full)

Publications

Publications (130)
Preprint
Full-text available
The efficient segmentation of foreground text information from the background in degraded color document images is a hot research topic. Due to the imperfect preservation of ancient documents over a long period of time, various types of degradation, including staining, yellowing, and ink seepage, have seriously affected the results of image binariz...
Preprint
Convolutional Neural Networks (CNN) increase depth by stacking convolutional layers, and deeper network models perform better in image recognition. Empirical research shows that simply stacking convolutional layers does not make the network train better, and skip connection (residual learning) can improve network model performance. For the image cl...
Preprint
Full-text available
With the excellent performance of deep learning technology in the field of computer vision, convolutional neural network (CNN) architecture has become the main backbone of computer vision task technology. With the widespread use of mobile devices, neural network models based on platforms with low computing power are gradually being paid attention....
Preprint
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With the achievements of Transformer in the field of natural language processing, the encoder-decoder and the attention mechanism in Transformer have been applied to computer vision. Recently, in multiple tasks of computer vision (image classification, object detection, semantic segmentation, etc.), state-of-the-art convolutional neural networks ha...
Preprint
Full-text available
With the continuous development of neural networks in computer vision tasks, more and more network architectures have achieved outstanding success. As one of the most advanced neural network architectures, DenseNet shortcuts all feature maps to solve the problem of model depth. Although this network architecture has excellent accuracy at low MACs (...
Article
Full-text available
With the continuous development of neural networks for computer vision tasks, more and more network architectures have achieved outstanding success. As one of the most advanced neural network architectures, DenseNet shortcuts all feature maps to solve the model depth problem. Although this network architecture has excellent accuracy with low parame...
Conference Paper
An low area cost and high resolution delta-sigma modulator for audio applications is proposed in this paper. It is a second-order switched-capacitor modulator that employs a 6- bit successive approximation register (SAR) quantizer for obtaining a high dynamic range. In addition, a R2R ladder digital-to-analog converter (DAC) is used as a sharing DA...
Preprint
Full-text available
Deep neural networks have made significant progress in the field of computer vision. Recent studies have shown that depth, width and shortcut connections of neural network architectures play a crucial role in their performance. One of the most advanced neural network architectures, DenseNet, has achieved excellent convergence rates through dense co...
Article
In recent years, the preservation of handwritten historical documents and scripts archived by digitized images has been gradually emphasized. However, the selection of different thicknesses of the paper for printing or writing is likely to make the content of the back page seep into the front page. In order to solve this, a cost-efficient document...
Article
Full-text available
Medical ultrasound images are often very obscure due to the capture devices used. As medical ultrasound images can provide information regarding potential pathological changes and abnormalities, images must be preserved and enhanced to help doctors to monitor the course of diseases. This work proposes using the energy concentration characteristics...
Article
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This paper presents a current-controlled oscillator (CCO) circuit design with temperature, voltage, and process compensation. A current reference biasing circuit comprising a complementary-to-absolute-temperature current and a proportional-to-absolute-temperature current is used for maintaining stability during temperature variations. In addition,...
Conference Paper
This paper is about automatically guided vehicle (AGV) system in the automated-storage-and-retrieval-system (ASRS). In ASRS, it usually uses AGV system to transport materials, because it not only efficient but can cost down logistic cost. However, the major problem of the application about AGV is how to find the position of the pallets due to the d...
Article
Full-text available
Industry 4.0 is an important trend in factory automation nowadays. Among the Automated-Storage-and-Retrieval-System (ASRS) is one of the most important issues for industry. It is widely used in a variety of industries for a variety of storage applications in factories and warehouses. However, the cost of constructing an ASRS is so high that most sm...
Conference Paper
The medical image segmentation technology is quite a challenging and complicated research. Generally, an X-ray image is often giving significant information of hard tissue pathology within most assessments. Compared with medical images of Computed Tomography (CT) and Magnetic Resonance Imaging (MRI), the advantages of X-ray imaging are inexpensive,...
Article
In recent years, 3D endoscopic imaging has played an important role in the development of the medical industry, making it easy for medical doctors to judge the visual depth of ulcers or tumors and thereby decreasing the risk of unnecessary damages to other tissues. A traditional 2D endoscopic image can be converted into a 3D view through depth esti...
Article
This work proposes an efficient video retrieval technique for video synopsis. In a video system, the Region of Interest (ROI) should be extracted in a long video effectively such that users can browse it quickly and easily. Focusing on the characteristics of objects in the foreground of real-world video sequences, this work employs the Gaussian Mix...
Conference Paper
This paper proposes an image stitching system based on Speeded Up Robust Feature (SURF). Considering that numerous car accidents occur due to blind spots of the rear mirror view, we propose a method with Haar wavelet transform to acquire the rear view using multiple monitors and apply the technique of image stitching to solve blind spots issue in o...
Conference Paper
Depth Image Based Rendering (DIBR) is a well-known process for producing 3D views, which can synthesize a virtual view from images and their associated depth information. However, in an image owing to the abrupt change of the scene, the depth image may change rapidly to make the converting view have holes with different sizes and directions, and su...
Article
In many real-world video analysis systems , the available resources are constrained, which limits the image resolution. However, the low computational complexity and fast response for low-resolution images still make them attractive for computer vision applications. This work presents a new model that uses a least-mean-square scheme to train the ma...
Conference Paper
This work proposes an efficient video retrieval technique for video synopsis. In order to reduce the search time, a new video synopsis search approach, low-complexity range tree algorithm, is proposed to improve the effectiveness of the search of the objects to match the requested conditions. With the time and space redundancy-reducing techniques o...
Conference Paper
Depth Image Based Rendering (DIBR) is an approach to generate a 3-D image by the original 2-D color image with the corresponding 2-D depth map. Although DIBR is a quite convenient technique of converting 2D to 3D images, there is a big problem in DIBR system that it cannot reach real-time processing due to the computing time. Therefore, this paper...
Article
Since the data storage capacity per unit area of a QR code is very limited, it is restricted in various QR code applications. An approach is proposed based on visual skew to improve the data capacity of the QR code. The proposed method can enhance the capacity of the QR code per unit area by using different angle views to combine several QR codes t...
Conference Paper
In this paper, a visualized scenario learning system is developed for children with high-functioning autism. The system differs from the traditional communication aids available for autistic children in that, as well as assisting communication; this system assists autistic children in learning how to use objects or context-appropriate physical cond...
Conference Paper
In this paper, we propose a highly efficient VLSI architecture for 2-D dual-mode (supporting 5/3 and 9/7 lifting-based) Symmetric Mask-based Discrete Wavelet Transform (SMDWT) to improve the critical issue of the 2-D Lifting-based Discrete Wavelet Transform (LDWT), and then obtains the benefit of low-latency reduced complexity, and low transpose me...
Article
Moving object tracking is a fundamental task on smart video surveillance systems, because it provides a focus of attention for further investigation. Continuously Adaptive MeanShift (CamShift) algorithm is an adaptation of the MeanShift algorithm for moving objects tracking significantly, and it has been attracting increasing interests in recent ye...
Conference Paper
Full-text available
This paper proposes a saturation adjustment method based on human vision with YCbCr color model characteristics and luminance changes. In the traditional color adjustment approach, people tried to separately adjust the luminance and saturation. However, this approach makes the color over-saturate very easily and makes the image look unnatural. In t...
Article
This study addresses a new digital calibration filter design for cascaded ΣΔ modulators with finite amplifier gain. A recent approach based on the H-infinity loop shaping method to this problem has the merit of obviating the use of an estimation or adaptive digital correction scheme, which thus reduces the complexity of circuit implementation. For...
Article
This paper presents a new approach, direct LL-mask band scheme (DLLBS), for the detection and tracking of moving objects using a low resolution image. Moving object detection is an important basic task for intelligent video surveillance systems, because it provides a focus of attention for post-processing. However, the successful detection of movin...
Article
Full-text available
The research of autonomous robots is one of the most important challenges in recent years. Among the numerous robot researches, the humanoid robot soccer competition is very popular. The robot soccer players rely on their vision systems very intensively when they are in the unpredictable and dynamic environments. This work proposes a simple and rea...
Article
This work presents a low power cascaded sigma-delta modulator for GSM and WCDMA applications. The proposed modulator has the characteristics of wide bandwidth for WCDMA applications and low distortion in the low frequency band for GSM applications. Low-distortion and interpolative techniques are used in this modulator to enhance the performance. Th...
Article
Computers have become popular appliances in our life, and people spend more and more time using computers. How to use computers healthily become important issues. In this paper, a hybrid face detector with the Symmetric Mask-based Discrete Wavelet Transform (SMDWT) and the Face Geometrical Features (FGF) is proposed. Moreover, in many real-world vi...
Article
For visual processing applications, the two-dimensional (2-D) Discrete Wavelet Transform (DWT) can be used to decompose an image into four-subband images. However, when a single band is required for a specific application, the four-band decomposition demands a huge complexity and transpose time. This work presents a fast algorithm, namely 2-D Symme...
Article
This paper describes a circuit, which generates a low temperature-dependent bias currents. In this paper, low temperature coefficient reference is presented. The circuit is firstly employed to generate a current reference with temperature compensation, then, supply current to the current controlled ring oscillator (CCO). Because of the oscillation...
Article
This work presents a new model based on least-mean-square (LMS) scheme to train the mask operation on low resolution images. This efficient and real-time method with adaptive least-mean-square scheme (ALMSS) uses the training mask for moving objects detection and tracking on resource-limited systems. However, the scheme of moving objects detection...
Article
This article presents new hardware architectures to address critical issues in 2-D dual-mode (supporting 5/3 lossless and 9/7 lossy coding modes) lifting-based discrete wavelet transform (LDWT) for Motion-JPEG2000. The massive requirement of transpose memory is the most critical for LDWT. The proposed architecture can support high-resolution videos...
Conference Paper
This work proposes a new Stereo Vision-Based Self- Localization System (SVBSLS) for the RoboCup soccer humanoid league rules for the 2010 competition. The humanoid robot integrates the information from the pan/tilt motors and stereo vision to accomplish the self-localization and measure the distance of the robot and the soccer ball. The proposed ap...
Article
This paper presents a new model for adaptive filter with the least-mean-square (LMS) scheme to train the mask operation on low resolution images. The adaptive filter theory with adaptive least-mean-square scheme (ALMSS) uses the training mask for moving object detection and tracking. However, the successful moving objects detection in a real surrou...
Article
The discrete cosine transform (DCT) has been widely used as the core of digital image and video signal compression. However, its computation is so intensive and it is important to meet the requirement for high speed. A novel architecture of the VLSI design of a 2D DCT has been developed. This architecture contains the following features: use of the...
Conference Paper
In the RoboCup soccer humanoid league competition, the vision system is used to collect various environment information as the terminal data to finish the functions of object recognition, coordinate establishment, robot localization, robot tactic, barrier avoiding, etc. Thus, a real-time object recognition and high accurate self-localization system...
Article
In this paper, a digital calibration method based on the H-infinity control approach is proposed for reducing the impact of the leakage of unshaped quantization noise from the first stage of the cascaded SDM due to the imperfect analog circuit. Simulation results show that the modulator with the proposed filter has the better signal-to-noise ratio...
Article
This paper describes mobile services with time constraints in ubiquitous computing environments. In a ubiquitous computing environment, the need for a real-time database management model is strong, because one of the basic requirements in mobile data management is to provide real-time response to transactions of the underlying strategies. However,...
Conference Paper
The research of autonomous robots is one of the most important issues in recent years. In the numerous robot researches, the humanoid robot soccer competition is very popular. The robot soccer players rely on their vision systems very heavily when they are in the unpredictable and dynamic environments. This paper proposes a simple and fast real-tim...
Conference Paper
Robot soccer game is one of the significant and interesting areas among most of the autonomous robotic researches. Following the humanoid soccer robot basic movement and strategy actions, the robot is operated in a dynamic and unpredictable contest environment and must recognize the position of itself in the field all the time. Therefore, the local...
Article
Full-text available
This paper presents a low-offset low-noise sigma-delta modulator with pseudorandom chopper-stabilization technique. The comparison of the noise-cancellation ability with the correlated double sampling and chopper-stabilization techniques is demonstrated; also, the noise performance of these cancellation techniques is observed and discussed. Using t...
Article
Full-text available
In this paper, a 10-Gb/s inductorless CMOS receiver front end is presented, including a transimpedance amplifier and a limiting amplifier. The transimpedance amplifier incorporates Regulated Cascode (RGC), active-inductor peaking, and intersecting active feedback circuits to achieve a transimpedance gain of 56 dBW and a bandwidth of 8.27 GHz with a...
Article
Full-text available
Wavelet coding performs better than discrete cosine transform in visual processing. Moreover, it is scalable, which is important for modern video standards. The transpose memory requirement and operation speed are the two major concerns in 2-D lifting-based discrete wavelet transform (LDWT) implementation. This letter presents a novel algorithm, ca...
Conference Paper
This work presents a fast algorithm, namely 2-D symmetric mask-based discrete wavelet transform (SMDWT), to address some critical issues of the 2-D discrete wavelet transform (DWT). Unlike the traditional DWT involving dependent decompositions, the SMDWT itself is subband processing independent, which can significantly reduce complexity. Moreover,...
Conference Paper
Conventionally a continuous time (CT) cascaded delta-sigma modulator is designed by virtue of the transforming from its equivalent discrete time (DT) cascaded delta-sigma modulator with compensation paths in the analog part. This work presents a new approach that does not need analog compensation paths when implementing a high order cascaded CT del...
Conference Paper
In this work, we propose a memory-efficient architecture of lifting based two-dimensional discrete wavelet transform (2D DWT) for motion-JPEG2000. The proposed 2D DWT architecture consists of a 1D row processor, internal memory, and a 1D column processor. The main advantage of this 2D DWT is to reduce the internal memory requirement significantly....
Conference Paper
In this work, we propose a high efficiency hardware architecture of embedded sub-band coding with optimal truncation (ESCOT) with word-level pass concurrent context modeling (Word-Level PCCM) scheme for wavelet-based scalable video coding (SVC). Word-Level PCCM can merge the three-pass process of bit-plane coding into a single pass process. It impr...
Article
In this paper, a sixth order multi-stage sigma-delta modulator is designed for GSM/WCDMA/WiMAX communication systems. With the multi-stage noise shaped architecture, the proposed modulator can reconfigure to adapt different system specifications. Meanwhile, the power dissipation is also flexible for power optimization. A prototype is designed with...
Article
Full-text available
A novel full-phase digital holographic encryption scheme with double random key masks, which are performed by electrically addressed liquid-crystal spatial light modulators for optical processing, is demonstrated. Phase-shifting digital holography is employed to generate the key holograms derived from the double key masks for implementing the encry...
Article
Full-text available
A carry-free subtractive division algorithm is proposed in this paper. In the conventional subtractive divider, adders are used to find both quotient bit and partial remainder. Carries are usually generated in the addition operation, and it may take time to finish the operation, therefore, the carry propagation delay usually is a bottleneck of the...
Article
This paper proposes a new two-channel time-interleaved delta-sigma modulator (DSM). The time-interleaved approach can reduce four times of sampling rate as compared with the conventional delta-sigma modulator and the performance is much better. This technique can relax the limitation of high-gain and high-speed requirements of opamps in the DSM des...
Conference Paper
Full-text available
This work presents new algorithms and hardware architectures to improve the critical issues of the 2-D dual-mode (supporting 5/3 lossless and 9/7 lossy coding) lifting-based discrete wavelet transform (LDWT). The proposed 2-D dual-mode LDWT architecture has the advantages of low-transpose memory, low latency, and regular signal flow, which is suita...
Article
This work describes a full phase encoding technique for digital holographic encryption based on liquid crystal spatial light modulators, which are operated in the phase modulation mode to perform the phase-encoding object and the double random phase key masks for optical Fresnel encryption. The architecture of four-step phase-shifting digital holog...
Conference Paper
In this paper, we propose a new video object segmentation algorithm using the morphological technique. Several video object segmentation algorithms use mathematical morphology to generate the object masks, however the operations of the mathematical morphology have two drawbacks: (1) high computation complexity and (2) the quality of the object mask...
Conference Paper
In this work, we propose a high efficiency hardware architecture of embedded sub-band coding with optimal truncation (ESCOT) with pass concurrent context modeling (PCCM) scheme for wavelet-based scalable video coding (SVC). PCCM can merge the three-pass process of bit-plane coding into a single pass process. It improves the efficiency of the ESCOT...
Article
In recent years, computer applications have increased in the computational complexity. The speed requirement forces designers of general-purpose microprocessors to pay particular attention to implement the floating point unit (FPU). A new floating-point division architecture that complies with the IEEE 754-1985 standard is proposed in this paper. T...
Conference Paper
The amount of memory required for code-block is one of the most important issues in JPEG2000 encoder chip implementation. This work tries to unify the output scanning order of the 2D-DWT and the processing order of the EBCOT and further to eliminate the code-block memory completely eliminated. We also propose a new architecture for embedded block c...
Conference Paper
Wavelet coding has been shown to be better than discrete cosine transform (DCT) in image/video processing. Moreover, it has the feature of scalability, which is involved in modern video standards. This work presents novel algorithms, namely 2-D symmetric mask-based discrete wavelet transform (SMDWT), to improve the critical issue of the 2-D lifting...
Conference Paper
H.264/AVC video coding uses the intra prediction scheme to compress the spatial redundancy. The main goal of the intra prediction is to achieve a better compression efficiency. For finding the optimal prediction modes, H.264/AVC adopts the full search algorithm in the standard. The high computation complexity of the full search algorithm makes the...
Conference Paper
In this paper, a low power sigma delta modulator with dynamic biasing technique is presented. According to the analysis of the operations of the switched-capacitor integrator, the folded-cascode operational amplifier can be designed with optimized biasing currents in three different phases to reduce power dissipations. The total power saving is 20%...
Article
Most recently used (MRU) cache is one of the set-associative caches that emphasize implementation of associativity higher than 2. However, the access time is increased because the MRU information must be fetched before accessing the sequential MRU (SMRU) cache. In this paper, focusing on the SMRU cache with subblock placement, we propose an MRU cac...
Conference Paper
The paper proposes a voltage-controlled oscillator (VCO) with low phase noise and low power dissipation for IEEE 802.11a. The VCO is implemented by a negative resistance multiple-gated circuit (NRMGC) and a bypass capacitor to achieve the performance. ...
Article
Full-text available
This work presents a parallel context-modeling coding architecture and a matching arithmetic coder (MQ-coder) for the embedded block coding (EBCOT) unit of the JPEG2000 encoder. Tier-1 of the EBCOT consumes most of the computation time in a JPEG2000 encoding system. The proposed parallel architecture can increase the throughput rate of the context...
Article
This work presents a new block motion estimation approach, diamond-arc-hexagon search (DAHS), which uses diamond, arc, and hexagon search patterns to accomplish the fast searching process. According to the characteristic of the center-based motion vector distribution for the real-world video sequence, DAHS employs a small diamond pattern extended h...
Conference Paper
H.264/AVC has achieved significant rate-distortion performance by many useful video encoding and decoding tools, but the motion estimation process concerns greatly on computational complexity. In this paper, an efficient fast motion estimation algorithm, hierarchical predictable hexagon search (HPHS) algorithm is proposed. The HPHS algorithm uses t...
Conference Paper
Full-text available
In this paper, a 20-Msample/sec and 12-bit resolution sigma delta modulator for 802.11a applications is presented. The distributed feedback with a forward input and resonator feedback schemes are utilized to implement this modulator. The fifth-order 3-bit quantizer single-loop sigma delta modulator achieves 20-MS/s conversion ratio with 74dB of dyn...
Conference Paper
This work presents a concurrent bit-plane coding architecture for EBCOT of JPEG2000. The architecture uses two bit-planes at the same time to encode data and this scheme can reduce the requirement of internal memory efficiently. Compared with the conventional approach, our concurrent architecture can save 8K-bit internal memory. In our proposed arc...
Article
This work presents a means to enhance the immunity of non-ideal opamp gain effect of the fourth order multi-stage noise shaped (MASH) sigma-delta modulator (SDM) for wide bandwidth applications. The first stage of the SDM is a low-distortion single-loop second order SDM, while the second stage is a low-distortion interpolative second order SDM with...
Article
This work presents a new low distortion and swing suppression second order sigma-delta modulator with extended dynamic range scheme. The proposed modulator is based on the dual-quantizer architecture and can effectively extend the dynamic range by only adding two simple digital filters in the digital circuit. The techniques of low distortion and sw...
Conference Paper
In the new version reference software JM9.2 of H.264 standard, the UMHexagonS motion estimation algorithm is adopted to find the best motion vector for video coding. The hybrid search strategies have significantly outperformed other algorithms (FS, 3TT, 4TT, DS, ..., etc.). However the highly computational complexity leads the codec to become too c...
Conference Paper
Focusing on the way-predicting cache with sub-block placement, we propose a new cache scheme that uses the valid bits from data memory to pre-decide disabling the unnecessary tag-subarrays and data-subarrays. By valid-bit pre-decision, it significantly helps in improving the average energy saving of the conventional way-predicting cache without val...