Pub Date : 2018-05-01DOI: 10.1109/ISCAS.2018.8351442
A. Mohammadi, M. Alizadeh, M. Sharifkhani
In this paper the complexity of the JVET encoder is analyzed. JVET is the joint video exploration team of ITU-T VCEG and ISO/IEC MPEG to explore new ways in video coding to improve HEVC/H.265 standard. Currently, JEM 7, the JVET reference software, is able to compress 30% better than HM, the HEVC reference software but its computational complexity is considerably higher than HM. By profiling function calls, time consuming functions in different encoding scenarios are analyzed and reported. It is observed that the upcoming standard could increase the complexity by up to 20 times compared to the current HEVC standard, if no optimization is considered. The contribution of each function is detailed and analyzed. The complexity is mostly attributed to the new intra-coding functions and new transform coding.
{"title":"JVET Encoder Complexity Analysis","authors":"A. Mohammadi, M. Alizadeh, M. Sharifkhani","doi":"10.1109/ISCAS.2018.8351442","DOIUrl":"https://doi.org/10.1109/ISCAS.2018.8351442","url":null,"abstract":"In this paper the complexity of the JVET encoder is analyzed. JVET is the joint video exploration team of ITU-T VCEG and ISO/IEC MPEG to explore new ways in video coding to improve HEVC/H.265 standard. Currently, JEM 7, the JVET reference software, is able to compress 30% better than HM, the HEVC reference software but its computational complexity is considerably higher than HM. By profiling function calls, time consuming functions in different encoding scenarios are analyzed and reported. It is observed that the upcoming standard could increase the complexity by up to 20 times compared to the current HEVC standard, if no optimization is considered. The contribution of each function is detailed and analyzed. The complexity is mostly attributed to the new intra-coding functions and new transform coding.","PeriodicalId":91083,"journal":{"name":"IEEE International Symposium on Circuits and Systems proceedings. IEEE International Symposium on Circuits and Systems","volume":"25 2 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83098328","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-05-01DOI: 10.1109/ISCAS.2018.8351123
Karan Gumber, M. Rawat
A low cost RFin-RFout Broadband-Predistorter Circuit (BB-PDC) has been designed to target higher order intermodes (IM) of high power amplifier in the 5G base station, which require higher bandwidth operation. Compared with the existing PDC, proposed BB-PDC exhibit better adjacent channel power ratio (ACPR) performance and provide cost effective linearization solution using passive component. Proposed BB-PDC poses several advantages over digital and hybrid envelope predistortion methods that includes compact size, simple circuitry, ability to process ultra-wideband signals and relaxation from power hungry as well as expensive data converters. It suffers from the limitation on the amount of intermodulation reduction achievable compared with the digital system. Performance of proposed PDC was verified using two tone signal with frequency spacing of 150MHz. Measurement results demonstrate the system dexterity and targets the higher order intermodes. For 150MHz two tone signal, IM3, IM5, and IM7 are reduced by 12.8dB, 10.5dB, and 6.8dB correspondingly.
{"title":"Modified RFin-RFout broadband predistorter for 5G communication system","authors":"Karan Gumber, M. Rawat","doi":"10.1109/ISCAS.2018.8351123","DOIUrl":"https://doi.org/10.1109/ISCAS.2018.8351123","url":null,"abstract":"A low cost RFin-RFout Broadband-Predistorter Circuit (BB-PDC) has been designed to target higher order intermodes (IM) of high power amplifier in the 5G base station, which require higher bandwidth operation. Compared with the existing PDC, proposed BB-PDC exhibit better adjacent channel power ratio (ACPR) performance and provide cost effective linearization solution using passive component. Proposed BB-PDC poses several advantages over digital and hybrid envelope predistortion methods that includes compact size, simple circuitry, ability to process ultra-wideband signals and relaxation from power hungry as well as expensive data converters. It suffers from the limitation on the amount of intermodulation reduction achievable compared with the digital system. Performance of proposed PDC was verified using two tone signal with frequency spacing of 150MHz. Measurement results demonstrate the system dexterity and targets the higher order intermodes. For 150MHz two tone signal, IM3, IM5, and IM7 are reduced by 12.8dB, 10.5dB, and 6.8dB correspondingly.","PeriodicalId":91083,"journal":{"name":"IEEE International Symposium on Circuits and Systems proceedings. IEEE International Symposium on Circuits and Systems","volume":"189 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86923832","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-05-01DOI: 10.1109/ISCAS.2018.8351208
Seyed Hadi Mirfarshbafan, M. Shabany, A. Amini, S. Nezamalhosseini
One of the solutions proposed to reduce system cost and power consumption in massive multiple-input multiple-output (MIMO) systems is the use of extremely low-resolution data converters in radio-frequency (RF) chains. The resulting severe signal distortion calls for more sophisticated data detection algorithms. The near Maximum-Likelihood (ML) detection schemes proposed so far, either exhibit numerical instability issues at high SNRs or suffer from prohibitively high computational complexity. In this paper, we propose a modified near-ML detection algorithm for the one-bit quantized case that eliminates the numerical issues with the lowest complexity among similar algorithms. We also present a low-complexity VLSI architecture for the proposed algorithm. Finally, we demonstrate the FPGA implementation results of the proposed architecture and show that its complexity is similar to that of linear detectors, while significantly outperforms them from the symbol error rate (SER) performance perspective.
{"title":"Near-ML Detection in Massive MIMO Systems with One-Bit ADCs: Algorithm and VLSI Design","authors":"Seyed Hadi Mirfarshbafan, M. Shabany, A. Amini, S. Nezamalhosseini","doi":"10.1109/ISCAS.2018.8351208","DOIUrl":"https://doi.org/10.1109/ISCAS.2018.8351208","url":null,"abstract":"One of the solutions proposed to reduce system cost and power consumption in massive multiple-input multiple-output (MIMO) systems is the use of extremely low-resolution data converters in radio-frequency (RF) chains. The resulting severe signal distortion calls for more sophisticated data detection algorithms. The near Maximum-Likelihood (ML) detection schemes proposed so far, either exhibit numerical instability issues at high SNRs or suffer from prohibitively high computational complexity. In this paper, we propose a modified near-ML detection algorithm for the one-bit quantized case that eliminates the numerical issues with the lowest complexity among similar algorithms. We also present a low-complexity VLSI architecture for the proposed algorithm. Finally, we demonstrate the FPGA implementation results of the proposed architecture and show that its complexity is similar to that of linear detectors, while significantly outperforms them from the symbol error rate (SER) performance perspective.","PeriodicalId":91083,"journal":{"name":"IEEE International Symposium on Circuits and Systems proceedings. IEEE International Symposium on Circuits and Systems","volume":"34 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84442785","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-05-01DOI: 10.1109/ISCAS.2018.8351061
A. Al-Ali, B. Maundy, A. Elwakil
The increasing interest in bio-impedance analysis in various fields has increased the demand for portable and low-cost impedance analyzers that can be used in the field. Simplifying the hardware is important to maintain low-cost and portability, but this is not an easy task due to the need for accurate phase and magnitude measurements. In this paper, a magnitude only hardware design is proposed and tested. The need to measure the phase is replaced by using a modified Kramers-Kronig transform to extract the phase from the magnitude information. Testing using on-shelf components, and comparisons using apple bio-impedance measurements from a professional impedance analyzer are also reported.
{"title":"Design and Implementation of a Bio-Impedance Analyzer Based on the Kramers-Kronig Transform","authors":"A. Al-Ali, B. Maundy, A. Elwakil","doi":"10.1109/ISCAS.2018.8351061","DOIUrl":"https://doi.org/10.1109/ISCAS.2018.8351061","url":null,"abstract":"The increasing interest in bio-impedance analysis in various fields has increased the demand for portable and low-cost impedance analyzers that can be used in the field. Simplifying the hardware is important to maintain low-cost and portability, but this is not an easy task due to the need for accurate phase and magnitude measurements. In this paper, a magnitude only hardware design is proposed and tested. The need to measure the phase is replaced by using a modified Kramers-Kronig transform to extract the phase from the magnitude information. Testing using on-shelf components, and comparisons using apple bio-impedance measurements from a professional impedance analyzer are also reported.","PeriodicalId":91083,"journal":{"name":"IEEE International Symposium on Circuits and Systems proceedings. IEEE International Symposium on Circuits and Systems","volume":"48 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88070960","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-05-01DOI: 10.1109/ISCAS.2018.8351718
Haibing Yin, Dong Li, Yu Lu, Yang Zhou
In video coder, inter-frame prediction causes distortion propagation among temporally adjacent frames, which complicates frame level bit allocation and quantization control. Quantization parameter cascading (QPC) is generally employed to determine a sequence of quantization parameter for dependent rate distortion optimization (RDO). This paper proposes a general framework for temporal dependency analysis by lever-aging a distortion propagation model. The amount of distortion propagated from the temporally adjacent frames is measured by tree-style dependent analysis. Then, a trellis comprised of frame level quantization parameters of one GOP is constructed to achieve global optimization via branch-prune based dynamic programming. The simulation results verify that the frame level QPC algorithm with the proposed distortion model achieves up to 1.2dB—1.5dB PSNR improvement on average, with smaller temporal distortion fluctuation contributed by efficient bit allocation.
在视频编码器中，帧间预测会导致失真在时间相邻帧之间传播，使帧级比特分配和量化控制变得复杂。在相关率失真优化(RDO)中，通常采用量化参数级联(QPC)来确定量化参数序列。本文提出了一种利用失真传播模型进行时间相关性分析的通用框架。从时间上相邻的帧传播的失真量通过树式相关分析来测量。然后，通过基于分支剪枝的动态规划，构建了由单个GOP的帧级量化参数组成的网格，实现全局优化。仿真结果表明，采用该失真模型的帧级QPC算法平均可提高1.2 db ~ 1.5 db的PSNR，且有效的比特分配有助于减小时间失真波动。
{"title":"Frame Level Quantization Control with Temporal Distortion Propagation Model for Video Coding","authors":"Haibing Yin, Dong Li, Yu Lu, Yang Zhou","doi":"10.1109/ISCAS.2018.8351718","DOIUrl":"https://doi.org/10.1109/ISCAS.2018.8351718","url":null,"abstract":"In video coder, inter-frame prediction causes distortion propagation among temporally adjacent frames, which complicates frame level bit allocation and quantization control. Quantization parameter cascading (QPC) is generally employed to determine a sequence of quantization parameter for dependent rate distortion optimization (RDO). This paper proposes a general framework for temporal dependency analysis by lever-aging a distortion propagation model. The amount of distortion propagated from the temporally adjacent frames is measured by tree-style dependent analysis. Then, a trellis comprised of frame level quantization parameters of one GOP is constructed to achieve global optimization via branch-prune based dynamic programming. The simulation results verify that the frame level QPC algorithm with the proposed distortion model achieves up to 1.2dB—1.5dB PSNR improvement on average, with smaller temporal distortion fluctuation contributed by efficient bit allocation.","PeriodicalId":91083,"journal":{"name":"IEEE International Symposium on Circuits and Systems proceedings. IEEE International Symposium on Circuits and Systems","volume":"169 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77324305","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-05-01DOI: 10.1109/ISCAS.2018.8351330
Shahaboddin Ghajari, M. Sharifkhani
A novel method for a two way offset calibration for an interleaved 2bit/cycle SAR based ADC is proposed. The offset mismatch between the interleaved sub-ADCs is cancelled using a background calibration circuit. Using the same circuit, the offset mismatch between the comparators used in the 2-bit per cycle SAR based sub-ADC's are cancelled at the same time. The technique is realized using a Reference comparator that sets the target offset for all comparators in all sub-ADCs. Using the proposed technique, a 1 GS/s 6-bit 2b/cycle SAR ADC is designed in 65 nm CMOS technology. The ADC consumes 3.36 mW from a 1.2 V supply voltage and achieves signal-to-noise-and-distortion ratio (SNDR) of 37.41 dB and figure of merit (FoM) of 55.49 fJ/Conv.Step at Nyquist frequency input. The FoM with mean SNDR derived from Monte-Carlo simulation is 60.42 fJ/Conv.Step. The proposed technique offers 4.5 dB improvement on average over a non-calibrated SAR ADC based on 1000 Monte-Carlo simulations.
{"title":"A Time-Interleaved 2b/Cycle SAR ADC with Background Offset Calibration","authors":"Shahaboddin Ghajari, M. Sharifkhani","doi":"10.1109/ISCAS.2018.8351330","DOIUrl":"https://doi.org/10.1109/ISCAS.2018.8351330","url":null,"abstract":"A novel method for a two way offset calibration for an interleaved 2bit/cycle SAR based ADC is proposed. The offset mismatch between the interleaved sub-ADCs is cancelled using a background calibration circuit. Using the same circuit, the offset mismatch between the comparators used in the 2-bit per cycle SAR based sub-ADC's are cancelled at the same time. The technique is realized using a Reference comparator that sets the target offset for all comparators in all sub-ADCs. Using the proposed technique, a 1 GS/s 6-bit 2b/cycle SAR ADC is designed in 65 nm CMOS technology. The ADC consumes 3.36 mW from a 1.2 V supply voltage and achieves signal-to-noise-and-distortion ratio (SNDR) of 37.41 dB and figure of merit (FoM) of 55.49 fJ/Conv.Step at Nyquist frequency input. The FoM with mean SNDR derived from Monte-Carlo simulation is 60.42 fJ/Conv.Step. The proposed technique offers 4.5 dB improvement on average over a non-calibrated SAR ADC based on 1000 Monte-Carlo simulations.","PeriodicalId":91083,"journal":{"name":"IEEE International Symposium on Circuits and Systems proceedings. IEEE International Symposium on Circuits and Systems","volume":"30 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72962607","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-05-01DOI: 10.1109/ISCAS.2018.8351533
G. Dolecek
This paper presents a novel multiplierless two-stage decimator for even decimation factor M. In comparison with a modified cosine-based decimator previously proposed in the literature, this decimator has an improved alias rejection in all folding bands. This improvement is achieved by introducing an expanded modified cosine filter in the first stage of the decimator. The choice of the expanded factor is crucial to achieve alias improvement. The two cases of the parity of the decimation factor of the first stage, being even or odd are discussed separately. Both cases are illustrated with examples. The efficient structures are also presented for both cases. Finally, the comparison with the cosine-based method is presented.
{"title":"Improving Comb Alias Rejection Using Modified Cosine Filters","authors":"G. Dolecek","doi":"10.1109/ISCAS.2018.8351533","DOIUrl":"https://doi.org/10.1109/ISCAS.2018.8351533","url":null,"abstract":"This paper presents a novel multiplierless two-stage decimator for even decimation factor M. In comparison with a modified cosine-based decimator previously proposed in the literature, this decimator has an improved alias rejection in all folding bands. This improvement is achieved by introducing an expanded modified cosine filter in the first stage of the decimator. The choice of the expanded factor is crucial to achieve alias improvement. The two cases of the parity of the decimation factor of the first stage, being even or odd are discussed separately. Both cases are illustrated with examples. The efficient structures are also presented for both cases. Finally, the comparison with the cosine-based method is presented.","PeriodicalId":91083,"journal":{"name":"IEEE International Symposium on Circuits and Systems proceedings. IEEE International Symposium on Circuits and Systems","volume":"35 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89897953","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-05-01Epub Date: 2017-09-28DOI: 10.1109/ISCAS.2017.8050242
Dongyun Lin, Zhiping Lin, Ramraj Velmurugan, Raimund J Ober
This paper proposes a modified spatially-constrained similarity measure (mSCSM) method for endosomal structure detection and localization under the bag-of-words (BoW) framework. To our best knowledge, the proposed mSCSM is the first method for fully automatic detection and localization of complex subcellular compartments like endosomes. Essentially, a new similarity score and a novel two-stage output control scheme are proposed for localization by extracting discriminative information within a group of query images. Compared with the original SCSM which is formulated for instance localization, the proposed mSCSM can address category based localization problems. The preliminary experimental results show the proposed mSCSM can correctly detect and localize 79.17% of the existing endosomal structures in the microscopic images of human myeloid endothelial cells.
{"title":"Automatic Endosomal Structure Detection And Localization in Fluorescence Microscopic Images.","authors":"Dongyun Lin, Zhiping Lin, Ramraj Velmurugan, Raimund J Ober","doi":"10.1109/ISCAS.2017.8050242","DOIUrl":"https://doi.org/10.1109/ISCAS.2017.8050242","url":null,"abstract":"<p><p>This paper proposes a modified spatially-constrained similarity measure (mSCSM) method for endosomal structure detection and localization under the bag-of-words (BoW) framework. To our best knowledge, the proposed mSCSM is the first method for fully automatic detection and localization of complex subcellular compartments like endosomes. Essentially, a new similarity score and a novel two-stage output control scheme are proposed for localization by extracting discriminative information within a group of query images. Compared with the original SCSM which is formulated for instance localization, the proposed mSCSM can address category based localization problems. The preliminary experimental results show the proposed mSCSM can correctly detect and localize 79.17% of the existing endosomal structures in the microscopic images of human myeloid endothelial cells.</p>","PeriodicalId":91083,"journal":{"name":"IEEE International Symposium on Circuits and Systems proceedings. IEEE International Symposium on Circuits and Systems","volume":"2017 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/ISCAS.2017.8050242","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"37084963","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-05-01DOI: 10.1109/ISCAS.2017.8050980
B. Sahoo
In this paper, a ring-oscillator (RO) based sub-1V leaky integrate-and-fire (I&F) neuron circuit is proposed, that can support user programmable refractory period and spike-frequency adaptation. Designed in CMOS 65-nm TSMC process, the neuron can operate from 0.9 V and has the unique feature that the same circuit can be programmed to operate either at biological time-scales or at accelerated time-scales. As ring-oscillators in nanometer CMOS are small compared to capacitors used in existing I&F silicon neuron (SiN), a large number of RO-based neurons can be integrated along with complex digital circuits to realize a single-chip Neuromorphic-SoC.
{"title":"Ring oscillator based sub-1V leaky integrate-and-fire neuron circuit","authors":"B. Sahoo","doi":"10.1109/ISCAS.2017.8050980","DOIUrl":"https://doi.org/10.1109/ISCAS.2017.8050980","url":null,"abstract":"In this paper, a ring-oscillator (RO) based sub-1V leaky integrate-and-fire (I&F) neuron circuit is proposed, that can support user programmable refractory period and spike-frequency adaptation. Designed in CMOS 65-nm TSMC process, the neuron can operate from 0.9 V and has the unique feature that the same circuit can be programmed to operate either at biological time-scales or at accelerated time-scales. As ring-oscillators in nanometer CMOS are small compared to capacitors used in existing I&F silicon neuron (SiN), a large number of RO-based neurons can be integrated along with complex digital circuits to realize a single-chip Neuromorphic-SoC.","PeriodicalId":91083,"journal":{"name":"IEEE International Symposium on Circuits and Systems proceedings. IEEE International Symposium on Circuits and Systems","volume":"75 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86165066","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-05-01DOI: 10.1109/ISCAS.2017.8050384
Gao Xinwei, Deng Haibo, Guo Yaoyao, Gu Chen-chen, S. Yongfang, Gao Anlin, Guo Licai, Mao Xunan, Lv Jing
Video quality in real-time mobile communication is often influenced by the ambient light. In the low-lighting condition, videos in real-time mobile communication are usually dark and lack details. To solve the above problem, we propose a fast low-lighting video enhancement algorithm by exploiting the constrained spatial-temporal model, in which three terms including luminance accuracy, contrast accuracy and temporal consistency are all considered. For the first term, the average luminance level of each frame is taken into account of a set of the off-line trained luminance enhancement functions. For the second term, the adjustment of the luminance range in the frame based statistical histogram is obtained for the adaptive contrast enhancement function. For the third term, the temporal consistency is utilized by considering the current enhancement function and these of the previous frames to avoid the flicker between these adjacent frames. Furthermore, the proposed method has been already implemented on Wechat, a social application that connects 800 million people with chat, calls and more. Extensive experiments demonstrate that the proposed method achieves better enhancement results than many current state-of-the-art methods.
{"title":"Low-lighting video enhancement using constrained spatial-temporal model for real-time mobile communication","authors":"Gao Xinwei, Deng Haibo, Guo Yaoyao, Gu Chen-chen, S. Yongfang, Gao Anlin, Guo Licai, Mao Xunan, Lv Jing","doi":"10.1109/ISCAS.2017.8050384","DOIUrl":"https://doi.org/10.1109/ISCAS.2017.8050384","url":null,"abstract":"Video quality in real-time mobile communication is often influenced by the ambient light. In the low-lighting condition, videos in real-time mobile communication are usually dark and lack details. To solve the above problem, we propose a fast low-lighting video enhancement algorithm by exploiting the constrained spatial-temporal model, in which three terms including luminance accuracy, contrast accuracy and temporal consistency are all considered. For the first term, the average luminance level of each frame is taken into account of a set of the off-line trained luminance enhancement functions. For the second term, the adjustment of the luminance range in the frame based statistical histogram is obtained for the adaptive contrast enhancement function. For the third term, the temporal consistency is utilized by considering the current enhancement function and these of the previous frames to avoid the flicker between these adjacent frames. Furthermore, the proposed method has been already implemented on Wechat, a social application that connects 800 million people with chat, calls and more. Extensive experiments demonstrate that the proposed method achieves better enhancement results than many current state-of-the-art methods.","PeriodicalId":91083,"journal":{"name":"IEEE International Symposium on Circuits and Systems proceedings. IEEE International Symposium on Circuits and Systems","volume":"1 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77204487","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：