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This paper proposed a novel dual-threshold computation method of Canny edge detector based on gradient magnitude histogram (GMH), targeting with the adaptive acquisition of low-/high-threshold for unimodal hysteresis thresholding. With the introduction of the bowstring concept, which accurately measures the tendency of the GMH on the whole, the dual-threshold computation is implemented by adaptive-searching...
Computed tomography (CT) detector requires quantizing the wide dynamic range (WDR) photocurrent with high speed. Existing CMOS CT detectors are limited by their low linearity. They also need high-resolution external analog-to-digital converters (ADC) to quantize the WDR. In this work, a novel synchronous partial quantization technique is developed to enable monolithic CMOS CT pixel detector. Improved...
Computed tomography (CT) requires high-speed detector with wide dynamic range (WDR) and high linearity. CMOS CT detectors have been demonstrated with WDR and quantum-limited noise. However, existing CMOS CT detectors have low linearity, which cause artifacts during the image reconstruction. They also require high-resolution off-chip analog-to-digital converter (ADC) to quantize the WDR. In this work,...
Microelectrode arrays (MEA) are widely used to record extracellular action potential (AP) and local field potential (LFP) in electro-psychological studies. Conventional MEA detectors have low linearity (1%) and limited dynamic range (DR<70dB). New immunological applications such as mast cell recoding require higher linearity and wider DR. In this paper, we introduce a new MEA detector architecture...
Bio-potential detection is important for bio-medical diagnostics and research. Bio-potentials are generally weak (muV) with high offsets (100 mV level). Low noise processing is critical to extract the signal. In this paper, we report the design of a single-chip CMOS bio-potential detector. The design uses chopping to suppress the low-frequency noise in CMOS amplifiers. The strong offset is removed...
Computed tomography (CT) detectors require wide dynamic range (DR) and high linearity. This paper reports the design of a new CMOS pixel with in-pixel acquisition front-end for CT in a 0.35 mum CMOS process. The detector uses a synchronous partial quantization scheme to linearly expand the dynamic range with a constant potential well size. A low-power analog-to-digital converter is also designed in...
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