UM
A Low-Power Compression-Based CMOS Image Sensor with Microshift-Guided SAR ADC
Zhong X.2; Zhang B.2; Bermak A.1; Tsui C.-Y.2; Law M.-K.3
2018-10-01
Source PublicationIEEE Transactions on Circuits and Systems II: Express Briefs
ISSN15497747
Volume65Issue:10Pages:1350-1354
AbstractThis brief presents a low-power compression-based CMOS image sensor for wireless vision applications. The sensor implements low-bit-depth imaging with planned sensor distortion (PSD) to effectively compress both data bandwidth and processing power while maintaining high reconstruction image quality. Accordingly, a column-parallel microshift-guided successive-approximation-register (SAR) ADC is proposed to enable 3-bit PSD imaging based on a 3× 3 pattern. To support normal imaging with low area overhead, the circuit is reconfigurable as an 8-bit SAR/single-slope ADC. The data bandwidth is further compressed by a customized lossless encoder based on predictive coding and run length coding. A 256× 216 prototype imaging system composed of the compression-based image sensor and the lossless encoder is fabricated in a 0.18-μ m standard CMOS process. Measurement results show that the image sensor achieves 3 bit/pixel (bpp) with 34.9-dB reconstruction peak signal-to-noise ratio (PSNR) and 0.91 structural similarity index (SSIM). With 1/4 spatial downsampling and lossless encoding, 0.31 bpp is obtained with 29.2-dB PSNR and 0.83 SSIM. The sensor consumes 14.8 μ W (full resolution) and 4.3 μ W (downsampling) at 15 fps, achieving state-of-the-art FoMs of 17.8 and 5.2 pJ/pixel frame, respectively. Including the encoder, the overall system dissipates as low as 1.2 μ J making it an attractive solution for wireless sensor networks.
KeywordCMOS image sensor focal-plane compression low bit depth microshift planned sensor distortion (PSD) SAR ADC wireless sensor networks
DOI10.1109/TCSII.2018.2859047
URLView the original
Language英語
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Cited Times [WOS]:3   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
CollectionUniversity of Macau
Affiliation1.Hamad Bin Khalifa University, College of Science and Engineering
2.Hong Kong University of Science and Technology
3.Universidade de Macau
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Zhong X.,Zhang B.,Bermak A.,et al. A Low-Power Compression-Based CMOS Image Sensor with Microshift-Guided SAR ADC[J]. IEEE Transactions on Circuits and Systems II: Express Briefs,2018,65(10):1350-1354.
APA Zhong X.,Zhang B.,Bermak A.,Tsui C.-Y.,&Law M.-K..(2018).A Low-Power Compression-Based CMOS Image Sensor with Microshift-Guided SAR ADC.IEEE Transactions on Circuits and Systems II: Express Briefs,65(10),1350-1354.
MLA Zhong X.,et al."A Low-Power Compression-Based CMOS Image Sensor with Microshift-Guided SAR ADC".IEEE Transactions on Circuits and Systems II: Express Briefs 65.10(2018):1350-1354.
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