Wide intrascene dynamic range CMOS APS using dual sampling

Yadid-Pecht, Orly; Fossum, Eric R.

doi:10.1109/16.628828

Cited by 183 publications

(63 citation statements)

References 6 publications

(3 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…5e. R and B are placed sequentially one after the other in odd rows, and W is placed in even rows to consider the data readout method of the CMOS image sensor and apply the the dual sampling approach to W. Using the dual sampling approach, two values with different exposure times can be obtained without modifying the readout method in which the sensor data is acquired by scanning each row [11]. Applying the dual sampling approach to the even rows, double-exposed W are obtained to cope with the rapid saturation problem and improve the sensitivity.…”

Section: Analysis Of Cfa Patternsmentioning

confidence: 99%

“…In spite of the degradation of spatial resolution along the horizontal direction, R and B are placed in odd rows and W is placed in even rows to consider a readout method of complementary metal oxide semi-conductor (CMOS) image sensor and apply a dual sampling approach to the even rows. The dual sampling approach is the method of improving the sensitivity by adding a second column signal processing chain circuit and a capacitor bank to a conventional architecture of CMOS image sensor without modifying the data readout method [11]. In the CMOS image sensor, the sensor data is acquired by reading each row.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Color interpolation algorithm for an RWB color filter array including double-exposed white channel

Song

Park

Kim

et al. 2016

EURASIP J. Adv. Signal Process.

View full text Add to dashboard Cite

In this paper, we propose a color interpolation algorithm for a red-white-blue (RWB) color filter array (CFA) that uses a double exposed white channel instead of a single exposed green (G) channel. The double-exposed RWB CFA pattern, which captures two white channels at different exposure times simultaneously, improves the sensitivity and provides a solution for the rapid saturation problem of W channel although spatial resolution is degraded due to the lack of a suitable color interpolation algorithm. The proposed algorithm is designed and optimized for the double-exposed RWB CFA pattern. Two white channels are interpolated by using directional color difference information. The red and blue channels are interpolated by applying a guided filter that uses the interpolated white channel as a guided value. The proposed method resolves spatial resolution degradation, particularly in the horizontal direction, which is a challenging problem in the double-exposed RWB CFA pattern. Experimental results demonstrate that the proposed algorithm outperforms other color interpolation methods in terms of both objective and subjective criteria.

show abstract

Section: Analysis Of Cfa Patternsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Color interpolation algorithm for an RWB color filter array including double-exposed white channel

Song

Park

Kim

et al. 2016

EURASIP J. Adv. Signal Process.

View full text Add to dashboard Cite

show abstract

“…Whereas biological systems enjoy upwards of 200 dB of dynamic range, typical CMOS image sensors can only achieve around 60 dB. Successful approaches to overcoming this limitation involve pixel level processing using variable rate integration time [12], taking multiple exposures [11] or outputting pixel saturation time [14], instead of a voltage. Biologically inspired imagers [13] have emulated octopus retinal systems by again using pixel level processing to output a time encoded intensity value, achieving wide dynamic range operation.…”

Section: Introductionmentioning

confidence: 99%

CMOS Camera With In-Pixel Temporal Change Detection and ADC

Chi

Mallik

Clapp

et al. 2007

IEEE J. Solid-State Circuits

View full text Add to dashboard Cite

show abstract

“…1,2 As discussed in many papers, 3,4 this capability can be used to enhance the sensor dynamic range. The idea is to capture several images during a normal exposure time -shorter integration time images capture the brighter areas of the scene while longer integration time images capture the darker areas of the scene.…”

Section: Introductionmentioning

confidence: 99%

<title>Optimal scheduling of capture times in a multiple-capture imaging system</title>

Chen

Gamal

2002

SPIE Proceedings

View full text Add to dashboard Cite

Several papers have discussed the idea of extending image sensor dynamic range by capturing several images during a normal exposure time. Most of these papers assume that the images are captured according to a uniform or an exponentially increasing exposure time schedule. Even though such schedules can be justified by certain implementation considerations, there has not been any systematic study of how capture time schedules should be optimally determined. In this paper we formulate the multiple capture time scheduling problem when the incident illumination probability density function (pdf) is completely known as a constrained optimization problem. We aim to find the capture times that maximize the average signal SNR. The formulation leads to a general upper bound on achievable average SNR using multiple capture for any given illumination pdf. For a uniform pdf, the average SNR is a concave function in capture times and therefore well-known convex optimization techniques can be applied to find the global optimum. For a general piece-wise uniform pdf, the average SNR is not necessarily concave. The cost function, however, is a Difference of Convex (D.C.) function and well-established D.C. or global optimization techniques can be used.

show abstract

Wide intrascene dynamic range CMOS APS using dual sampling

Cited by 183 publications

References 6 publications

Color interpolation algorithm for an RWB color filter array including double-exposed white channel

Color interpolation algorithm for an RWB color filter array including double-exposed white channel

CMOS Camera With In-Pixel Temporal Change Detection and ADC

<title>Optimal scheduling of capture times in a multiple-capture imaging system</title>

Contact Info

Product

Resources

About