To start with, here is the list of image sensor companies, as of November, 2005. These are only silicon-based vendors, no exotic materials here.
Ball Aerospace and Technologies
Emerging Memory & Logic Solution, Inc. (EMLSI)
EM Microelectronic - Marin SA
IMS Vision (JV of Omron and IMS)
Kedah Wafer Emas - KWE (UniqueICs subsidiary)
New Imaging Technologies
Optrima, Optrima-Softkinetic JV
Semiconductor Technology Associates
Silicon Optronics (JV of Omnivision and Powerchip)
Teledyne Imaging Sensors
Vision Integration Technology - ViTi
In total: 93 companies
Updated on Nov 28, 2005: Alexima and Awaiba are added.
Updated on Dec 1, 2005: added Silicon Optronics (Taiwan), Galaxycore (China), Beijing Superpix Micro Technology. Agilent changed to Avago.
Updated on Dec 8, 2005, SensL Technologies (Cork, Irland) added.
Updated on Dec 31, 2005, Fujifilm added.
Update Jan. 30, 2006: SuperPix (China) added.
Update Feb. 20, 2006: Forza Silicon added (CIS design services).
Update Apr. 1, 2006: ADVIS (Rochester, NY) added.
Update May 14, 2006: Shimadzu (Japan) added.
Update May 18, 2006: Anafocus (Spain) added.
Update June 6, 2006: Candela Microsystems (Singapore) added.
Update July 9, 2006: Rohm added.
Update Aug 7, 2006: Atmel sold its image sensor business to e2v, thus removed.
Update Nov 7, 2006: Truesight seems to be defunct for some time, thus deleted. TrueImaging added.
Update Jan 9, 2007: Bejung Superpix Micro Tech removed as Superpix duplicate. Banpil added.
Update Jan 10, 2007: Emerging Memory & Logic Solution, Inc. (EMLSI) added.
Update Mar. 1, 2007: Sensata Technologies added.
Update Apr. 12, 2007: CSEM and 3DV Systems added
Update July 14, 2007: CMOX has been shut down, deleted from the list
Update July 20, 2007: ADVIS apparently changed its name to Signal Sciences
Update July 27, 2007: Biomorphic ceased operation, deleted from the list
Update Aug. 25, 2007: California-based CCD maker Semiconductor Technology Associates and Bart Dierickx's startup Caeleste added
Update Aug. 27, 2007: Taiwan-based e-Phocus and Hi-Max Imaging added
Update Sept. 13, 2007: SiGe sensor maker NoblePeak Vision from Boston area added
Update Oct. 16, 2007: C.I. Sensor is defunct now. Its web site is dead. The rumor is that some time ago it has changed its name to SITI, or something like that, and was acquired by Dongbu soon after that.
Update Oct. 17,2007: Taiwan-based Vision Integration Technology (ViTi), a manufacturer of security and surveillance sensors, was added
Transchip was acquired by Samsung, thus deleted from the list
Update July 17, 2008: CMOSIS added
Rosnes added - a mysterous Japanese startup promising CCD-quality CMOS sensors. NTT Finance invested in it.
Newport Imaging added, even though it's struggling for survival now. Founded by Ian Olsen of YMedia fame.
Update Sep 14, 2008: Rockwell Scientific was acquired by Teledyne in Sep. 2006. In Feb. 2008 Teledyne acquired Teledyne acquired IR sensor vendor Judson Technology. They were merged into Teledyne Imaging Sensors.
Update Sep 17, 2008: Designer of custom CMOS sensors Lumiense Photonics added.
Intevac Imaging, a night vision CMOS sensors and systems manufacturer, added.
Update Oct. 31, 2008: Magnachip closed its CIS business, is deleted from the list.
SiOnyx, the Black Silicon startup is added.
BYD is added.
Trueimaging seems to be defunct, deleted.
Update Nov. 7, 2008: ZMD is out of image sensor business, deleted.
Update Nov. 8, 2008: Mesa Imaging added.
Update Dec 24, 2008: ESS removed, a long overdue
Clairpixel, Korea, the spin-off of Mtekvision, added
Update Dec 27, 2008: Foveon switched to Sigma as a result of the acquisition
Update Feb. 22, 2009: Rui-Xin-Brigates added.
Update Oct. 1, 2009: Micron is changed to Aptina
Update Oct. 6, 2009: New Imaging Technologies - a French startup comapany added.
Update Nov. 3, 2009: 3DV Ssytems removed, as it was acquired by Microsoft in mid-2009
Brookman Technology added - a Japan-based custom sensor design company
Update Nov 17, 2009: Ball Aerospace and Technologies Corp. (Boulder, CO) added.
Update Nov 18, 2009: Brainvision added - a Japan-based company developing TOF imager for Stanley Electric. Operates since 1998, 8 employees.
Update Dec 6, 2009: Optrima added - a Belgian 3D ToF startup, founded in April 2009, based on Vrejie University of Brussels technology. Formed JV with Softkinetic - another Belgium-based startup developing software for gesture recognition.
Update Dec 30, 2009: ImagerLabs added - an LA-area, California-based low noise CCD supplier. Founded in 2001.
ENG added - Fukuoka, Japan based HDR sensor vendor and custom design house.
Update June 23, 2010: Harvest Imaging and Tangent Technologies added.
Update June 27, 2010: AMI-Peripheral Imaging seems to exit image sensor business. At least their new mother company ON Semi does not have image sensors in its current product list.