著者

竹茂 求 那須 潜思 佐々木 正明 高田 稔 鹿股 昭雄 小川 廣幸

出版者

The Society of Instrument and Control Engineers

雑誌

計測自動制御学会論文集 (ISSN:04534654)

巻号頁・発行日

vol.39, no.6, pp.521-527, 2003-06-30 (Released:2009-03-27)

参考文献数

6

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As an improved methodology for rapidly enumerating viable bacteria, microbial colonies in agar media are observed in the microscopic fashion at regular rate from the initial stage of culturing while media plate is being incubated. At each sampling time, in order to observe colonies in various depths without focusing on any of them, an agar plate is irradiated by a point light source to project the clear shadow of colonies onto the CCD image sensor. The projected image is processed with a computer to detect the colonies automatically. As the result of the experiment with E. coli, the number of colonies had reached to the plateau after six hours of incubation and the enumeration process was completed.

著者

佐々木 正明 川人 祥二 田所 嘉昭

出版者

The Institute of Electrical Engineers of Japan

雑誌

電気学会論文誌C(電子・情報・システム部門誌) (ISSN:03854221)

巻号頁・発行日

vol.121, no.8, pp.1312-1317, 2001-08-01 (Released:2008-12-19)

参考文献数

14

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This paper presents a method for integrating gamma correction and gain control functions on a CMOS image sensor with logarithmic response. The proposed method is based on a fact that gain variation and level shifting in logarithmic compressed domain are equivalent to the gamma correction and the gain control, respectively, in the exponentially expanded domain. The prototype chip integrating proposed function is fabricated with triple-metal double poly-silicon n-well 0.6μm CMOS technology. As a result of calculation using measurement data of test circuits, the gamma value can be adjusted to 0.45 when the gain given in the logarithmic compressed domain is 0.741, and a gain of 20dB is obtained by the voltage level shift of 60mV.