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:
May. 22, 1984
Filed:
Feb. 16, 1982
Rudolf Ackermann, Erlangen, DE;
Siemens Aktiengesellschaft, Berlin and Munich, DE;
Abstract
An exemplary embodiment operates according to the principle of non-linear manipulation of the brightness distribution of video pictures by means of matching the brightness distribution (histogram) to a prescribed function F(H). An arithmetic unit with a histogram memory determines the histogram of a video image. A processing circuit is connected to the histogram memory and calculates correction values from the histogram for example during a vertical blanking interval so as to convert the current image point information into corrected image point information in accord with the prescribed function F(H), the corrected information being read into a correction memory. The image point information of a video image is supplied to the address input of the correction memory for conversion in accord with the correction values stored there.