Vision assistance in scenes with extreme contrast

Seger, U.; Graf, H.-G.; Landgraf, Matthias

doi:10.1109/40.210524

Cited by 36 publications

(9 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Δv drop = s parasitic ‧E‧t hold ‧C hold -1 (5) As E b is extracted from measurements of the mean gray value y̅ (E), the average delay time t ̅ hold between the GS pulse to the readout of the pixel rows (from first to last row) has to be considered. It is roughly half of the readout time t ̅ hold ≈½T readout ≈1/(2‧f frame rate ) and normally shorter than the reciprocal of the frame rate.…”

Section: Discussion Of the Integrated Sandh Circuitry Of The Gs Pixelmentioning

confidence: 99%

See 1 more Smart Citation

High dynamic range CMOS (HDRC) imagers for safety systems

Strobel¹,

Döttling²

2013

Advanced Optical Technologies

View full text Add to dashboard Cite

The first part of this paper describes the high dynamic range CMOS (HDRC ® ) imager -a special type of CMOS image sensor with logarithmic response. The powerful property of a high dynamic range (HDR) image acquisition is detailed by mathematical definition and measurement of the optoelectronic conversion function (OECF) of two different HDRC imagers. Specific sensor parameters will be discussed including the pixel design for the global shutter readout. The second part will give an outline on the applications and requirements of cameras for industrial safety. Equipped with HDRC global shutter sensors SafetyEYE ® is a high-performance stereo camera system for safe three-dimensional zone monitoring enabling new and more flexible solutions compared to existing safety guards.

show abstract

Section: Discussion Of the Integrated Sandh Circuitry Of The Gs Pixelmentioning

confidence: 99%

“…HDRC imagers, their properties, technology and applications have been intensively discussed in previous articles and publications [1][2][3][4][5]. The following part of this paper focuses on the shutter types: rolling shutter (RS) versus global shutter (GS).…”

Section: Logarithmic High Dynamic Range Cmos (Hdrc) Imagersmentioning

confidence: 99%

High dynamic range CMOS (HDRC) imagers for safety systems

Strobel¹,

Döttling²

2013

Advanced Optical Technologies

View full text Add to dashboard Cite

show abstract

“…Logarithmic photoreceptor (see [2] [3] [5] [10]) presents two major drawbacks: 1° poor sensibility; 2° its large fixed pattern noise (FPN), it's very difficult to cancel, even off-chip, due to its nonlinear transformation.…”

Section: Adaptive Photoreceptormentioning

confidence: 99%

Analog multimode visual feature extraction retina

Ni¹,

Guan²

1998

SPIE Proceedings

View full text Add to dashboard Cite

We propose a multimode retina integrating image sensing, normalization, smoothing, differentiation and visual feature extraction by incorporating: 1) a histogram equalization function onto the sensor focal plane, which normalizes the image signal at the same dynamic range under different illumination conditions and results a constant signal amplitude facilitating the post processing; 2) a capacitive Gaussian network and a spatial differentiator, which offer a bandpass filtering on the normalized image; 3) a visual feature extraction, which extracts and localizes the areas enveloping objets of interest.This novel multimode retina, when interfaced with a digital processing unit, does a first step processing and information salient region extraction suited for many real-time vision tasks.

show abstract

“…The first method employs the logarithmic response of a CMOS sensor to compute the logarithm of a irradiance in the analog domain. 10 The second method involves measuring the time that a sensor pixel takes to attain full capacity, 11 which is proportional to spectral radiance. This way a sensor never saturates and higher dynamic range can be captured.…”

Section: Acquisitionmentioning

confidence: 99%

High dynamic range imaging pipeline: perception-motivated representation of visual content

Mantiuk

Krawczyk

Mantiuk³

et al. 2007

SPIE Proceedings

View full text Add to dashboard Cite

The advances in high dynamic range (HDR) imaging, especially in the display and camera technology, have a significant impact on the existing imaging systems. The assumptions of the traditional low-dynamic range imaging, designed for paper print as a major output medium, are ill suited for the range of visual material that is shown on modern displays. For example, the common assumption that the brightest color in an image is white can be hardly justified for high contrast LCD displays, not to mention next generation HDR displays, that can easily create bright highlights and the impression of self-luminous colors. We argue that high dynamic range representation can encode images regardless of the technology used to create and display them, with the accuracy that is only constrained by the limitations of the human eye and not a particular output medium. To facilitate the research on high dynamic range imaging, we have created a software package (http://pfstools.sourceforge.net/) capable of handling HDR data on all stages of image and video processing. The software package is available as open source under the General Public License and includes solutions for high quality image acquisition from multiple exposures, a range of tone mapping algorithms and a visual difference predictor for HDR images. Examples of shell scripts demonstrate how the software can be used for processing single images as well as video sequences.

show abstract

Vision assistance in scenes with extreme contrast

Cited by 36 publications

References 6 publications

High dynamic range CMOS (HDRC) imagers for safety systems

High dynamic range CMOS (HDRC) imagers for safety systems

Analog multimode visual feature extraction retina

High dynamic range imaging pipeline: perception-motivated representation of visual content

Contact Info

Product

Resources

About