Patent Number: 6,343,158

Title: Apparatus for converting gray levels of an image, a method thereof, a program storage device thereof, and an infrared camera

Abstract: An apparatus for converting gray levels of an image, a method thereof, a program storage device thereof, and an infrared camera. The object of the present invention is to provide an apparatus for converting gray levels into fewer gray levels without missing a local gradation, a method thereof, a program storage device thereof, and an infrared camera to which the present invention is applied. A positive mask image (C) and a reversed mask image (C') are obtained the edge detected image (B) which is produced by emphasizing edges of an original image (A). A low frequency component (D) is obtained by performing an edge preserving smoothing operation for A masked with C, and performing a non-edge preserving smoothing operation for A masked with C'. A high frequency component (E) is obtained by calculating of (A-D). After D is compressed to D' and E is emphasized to E', an output image (F') is obtained by adding D' and E'.

Inventors: Shiohara; Morito (Kawasaki, JP)

Assignee: Fujitsu Limited

International Classification: H04N 5/20 (20060101); G06K 009/44 (); G06T 005/20 (); G09G 005/10 (); H04N 001/409 ()

Expiration Date: 01/29/2019