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:
Sep. 22, 2009
Filed:
Jul. 23, 2003
Shuji Sugeno, Moriya, JP;
Shigeyuki Ikeda, Kashiwa, JP;
Tadashi Nakamura, Kashiwa, JP;
Hitachi Medical Corporation, Tokyo, JP;
Abstract
An edge preservation type of recursive filteroutputs an unsharpened image (i.e., low-frequency components) which is smoothed while preserving an edge of an input image in at least one direction (e.g., a vertical direction of the image). The low-frequency components are compressed into a suitable amount by a LUTprovided as low-frequency component compression amount setting means and then output. An arithmetic unitprovided as low-frequency component compression means compresses the low-frequency components of the input image by subtracting from the input image the output value from the LUTThe edge-preservation-type recursive filtercan extract the low-frequency components of the input image with an input time delay corresponding to one line of the input image. Therefore, DRC processing has only a short delay due to image processing and is capable of real-time processing by a small amount of computation. In this way, contrast at a medium-to-fine detail of the image such as a catheter can be improved while preventing occurrence of an artifact such as a black region in the processed image.