The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 07, 2012
Filed:
Jun. 05, 2008
Mitsuaki Kita, Kanagawa, JP;
Nobuyuki Sato, Tokyo, JP;
Masashi Wakatsuki, Hyogo, JP;
Shinya Ishibashi, Osaka, JP;
Jun Minakuti, Osaka, JP;
Takahiro Koyama, Osaka, JP;
Mitsuaki Kita, Kanagawa, JP;
Nobuyuki Sato, Tokyo, JP;
Masashi Wakatsuki, Hyogo, JP;
Shinya Ishibashi, Osaka, JP;
Jun Minakuti, Osaka, JP;
Takahiro Koyama, Osaka, JP;
Sony Corporation, Tokyo, JP;
Abstract
Imaging signal obtained through exposure for divided exposure times is A/D converted to digital imaging signal. Dark current component is subtracted from the digital imaging signal. The result of subtraction is accumulated and stored in a first memory. Next, exposure for divided exposure times is performed with the imaging device shielded from light. The obtained imaging signal is A/D converted to digital imaging signal. Dark current component is subtracted from the digital imaging signal. The result of subtraction is accumulated and stored sequentially in a second memory. The digital imaging signal stored in the second memory is subtracted from the digital imaging signal stored in the first memory. Then the result of subtraction is output. The word length allocated to one pixel in the first and second memories is longer than the word length of one A/D converted pixel.