Results 211 to 220 of about 23,612 (262)

Active pixel sensor array as a detector for electron microscopy

Ultramicroscopy, 2005
A new high-resolution recording device for transmission electron microscopy (TEM) is urgently needed. Neither film nor CCD cameras are systems that allow for efficient 3-D high-resolution particle reconstruction. We tested an active pixel sensor (APS) array as a replacement device at 200, 300, and 400 keV using a JEOL JEM-2000 FX II and a JEM-4000 EX ...
Anna-Clare Milazzo, Liang Jin, James C Bouwer   +2 more
exaly   +3 more sources

High-dynamic-range active pixel sensor

SPIE Proceedings, 2004
A new pixel structure for high dynamic range imaging is proposed. The internal pixel circuit resets the pixel each time the well capacity nears saturation and a counter, implemented in the pixel itself (or in an external memory), records the number of resets per integration time. The increase in the dynamic range is given by a factor of (m + 1) where m
Allinson, Nigel, Anaxagoras, Thalis
openaire   +2 more sources

Design of a self-correcting active pixel sensor

Proceedings 2001 IEEE International Symposium on Defect and Fault Tolerance in VLSI Systems, 2002
Digital cameras are growing ever larger in silicon area and pixel count, which increases the occurrence of defects at fabrication time, or dead pixels that develop over their lifetime. An active pixel sensor self-correcting for most common faults is created by splitting the photodiode and readout transistors into two parallel portions with only a small
Yves Audet, Glenn H. Chapman
openaire   +2 more sources

A CMOS active-pixel image sharpness sensor

2014 IEEE 57th International Midwest Symposium on Circuits and Systems (MWSCAS), 2014
The technique of maximizing image sharpness is a powerful means of adaptively correcting phase aberrations in wavefronts. Crucial to this correction is a sensor that provides an accurate real-time estimate of image sharpness. In this paper, we introduce a novel image sharpness sensor using CMOS active pixel technology that computes image sharpness at a
Aditya Rayankula, Paul M. Furth
openaire   +1 more source

A toolkit to demystify CMOS Active Pixel Sensors

2013 IEEE International Conference on Microelectronic Systems Education (MSE), 2013
No specific pedagogical methods are dedicated to explain the specificity of CMOS Active Pixel Sensor (APS) technologies. Nevertheless, this technology of image sensing is wide-spread in today's life and needs a good understanding on behalf of our students in microelectronics. This paper proposes a toolkit implemented with MATLAB.
Galliere, Jean-Marc, Boch, Jérôme
openaire   +2 more sources

A differential active pixel sensor

SPIE Proceedings, 2004
A differential active pixel sensor in present day CMOS technologies is described. The primary goal of the architecture is to reduce visible noise artifacts in the output image. Artifacts caused by gain mismatches among pixel elements, kTC noise, fixed-pattern noise due to reset mismatches, and corrupted pixels are considered.
openaire   +1 more source

Adaptive multiple resolution CMOS active pixel sensor

2004 IEEE International Symposium on Circuits and Systems (IEEE Cat. No.04CH37512), 2004
A smart image sensor with adaptive multiple resolution ability is presented. This sensor is based on the quadtree decomposition algorithm, which decomposes an image into square homogeneous regions. After the image is segmented, only the value of the block and its size are stored or transmitted.
Evgeny Artyomov, Orly Yadid-Pecht
openaire   +1 more source

CMOS active pixel image sensor

IEEE Transactions on Electron Devices, 1994
A new CMOS active pixel image sensor is reported. The sensor uses a 2.0 /spl mu/m double-poly, double-metal foundry CMOS process and is realized as a 128/spl times/128 array of 40 /spl mu/m/spl times/40 /spl mu/m pixels. The sensor features TTL compatible voltages, low noise and large dynamic range, and will be useful in machine vision and smart sensor
S. Mendis, S.E. Kemeny, E.R. Fossum
openaire   +1 more source

Radiation effects on active pixel sensors

1999 Fifth European Conference on Radiation and Its Effects on Components and Systems. RADECS 99 (Cat. No.99TH8471), 2003
An active pixel sensor (APS) is defined as a CMOS detector array that has at least one active transistor integrated into the pixel. Two kinds of detector arrays were used: one photodiode and one photogate. Their tolerance against total dose and proton irradiations are evaluated.
M. Cohen, J.P. David
openaire   +1 more source