Characterization and deblurring of lateral crosstalk in CMOS image sensors

Lee, Ji Soo; Shah, Jaspal Singh; Jernigan, M.E.; Hornsey, Richard

doi:10.1109/ted.2003.819246

Cited by 19 publications

(3 citation statements)

References 27 publications

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“…1). To explore the issue further we have expanded the model to incorporate camera-related parameters that can affect speckle contrast including (i) rounding of the intensity value to an unsigned 8-bit integer, (ii) lateral pixel cross-talk 14 and (iii) a fixed noise pattern. For simplicity, we implemented a symmetrical pixel cross-talk using a convolution of the speckle pattern with a 7 × 7 Gaussian kernel with a standard deviation of 0.5 pixels.…”

Section: Resultsmentioning

confidence: 99%

Choosing a laser for laser speckle contrast imaging

Postnov

Cheng

Erdener

et al. 2019

Sci Rep

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The use of laser speckle contrast imaging (LSCI) has expanded rapidly for characterizing the motion of scattering particles. Speckle contrast is related to the dynamics of the scattering particles via a temporal autocorrelation function, but the quality of various elements of the imaging system can adversely affect the quality of the signal recorded by LSCI. While it is known that the laser coherence affects the speckle contrast, it is generally neglected in in vivo LSCI studies and was not thoroughly addressed in a practical matter. In this work, we address the question of how the spectral width of the light source affects the speckle contrast both experimentally and through numerical simulations. We show that commonly used semiconductor laser diodes have a larger than desired spectral width that results in a significantly reduced speckle contrast compared with ideal narrow band lasers. This results in a reduced signal-to-noise ratio for estimating changes in the motion of scattering particles. We suggest using a volume holographic grating stabilized laser diode or other diodes that have a spectrum of emitted light narrower than ≈1 nm to improve the speckle contrast.

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Section: Resultsmentioning

confidence: 99%

Choosing a laser for laser speckle contrast imaging

Postnov

Cheng

Erdener

et al. 2019

Sci Rep

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“…PMOS structure [28] also make sense due to its limit in diffusion. Besides, linear deblurring [29] and crosstalk compensation algorithm [30] are adopted to improve image quality.…”

Section: Introductionmentioning

confidence: 99%

A novel method to test and optimize the periphery crosstalk in CMOS image sensor

Liu

Zhang

Shen

2020

IEICE Electron. Express

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For the purpose of reducing the peripheral crosstalk occur in the edge pixel, we illustrated a method to test and quantify the intensity of this crosstalk, and setup a model combining the opposite incident light and color construction. With the aid of the method and model, we conducted many experiments to analyze and compare the improvement measures, finding that the increase of pixel edge to package edge distance, sealing glass thinning and black photoresist coating around edge are all effective to reduce the peripheral crosstalk. Moreover, considering the effect and cost, the sealing glass thinning is the relatively best measure.

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“…The significant advantages of the CMOS image sensor are low power consumption, high dynamic range, high pixel rate and high on-chip system integration [2][3][4][5]. All these make it popular in many applications such as machine vision, scientific imaging and military imaging [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

A high dynamic range complementary metal-oxide-semiconductor (CMOS) camera using multi-slope response and an image reconstruction algorithm

Shang

Guan

Zhang

et al. 2009

Meas. Sci. Technol.

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Dynamic range is a critical figure of merit for an imaging system; it describes the observable range of brightness. This paper introduces the design of a complementary metal-oxide-semiconductor (CMOS) camera for astronomical imaging using the IBIS5 sensor. The camera achieves a high dynamic range by multi-slope response using variable reset voltages. A method to convert an image captured in multi-slope response into a linear image, and thus obtain higher contrast, is developed and analysed. Finally, observation results of the sun and the moon with this camera are presented. The results confirm the practicality of this camera and the image reconstruction method in scientific applications.

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Characterization and deblurring of lateral crosstalk in CMOS image sensors

Cited by 19 publications

References 27 publications

Choosing a laser for laser speckle contrast imaging

Choosing a laser for laser speckle contrast imaging

A novel method to test and optimize the periphery crosstalk in CMOS image sensor

A high dynamic range complementary metal-oxide-semiconductor (CMOS) camera using multi-slope response and an image reconstruction algorithm

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