Title:
AUTOMATIC BLACK GAMMA CONTROLLER FOR LUMINANCE SIGNAL
Document Type and Number:
Japanese Patent JP2765368
Kind Code:
B2
Abstract:
PURPOSE: To enable a viewer to view with the optimum black gamma correction according to the video state by providing a black gamma control amount correcting circuit controlling the control amount of the black gamma control circuit according to the control output of the fuzzy black gamma control output decision device.
CONSTITUTION: The fuzzy deduction is performed by obtaining the detection values from detection circuits 4-9 and taking the control index value to evaluate the fuzzy collection from pre-processing circuits 11-16 as input. The output from fuzzy deduction devices 17 to 22 is imparted to the decision device of a fuzzy black gamma control output 23, where the fuzzy black gamma control output is decided as the output of the fuzzy black gamma controller 10. The output from the controller 10 is inputted to the black gamma control amount correcting device correcting the black gamma control amount of the black gamma correcting circuit 2. The black gamma control amount correcting device 2 controls the black gamma correcting amount applied to the luminance signal of the black gamma control circuit 1, maintaining the optimum black gamma control at all times.
Inventors:
TAKESHIMA MASAHIRO
Application Number:
JP14725392A
Publication Date:
June 11, 1998
Filing Date:
June 08, 1992
Export Citation:
Assignee:
MATSUSHITA DENKI SANGYO KK
International Classes:
H04N5/202; G06F9/44; H04N5/57; (IPC1-7): H04N5/202
Domestic Patent References:
| JP4365268A | ||||
| JP57312A | ||||
| JP591532A | ||||
| JP4354268A |
Attorney, Agent or Firm:
Tomoyuki Takimoto