Method of and apparatus for executing tone correction on an imag

Details Method of and apparatus for executing tone correction on an imag Method of and apparatus for executing tone correction on an imag

1987-08-03

1990-05-22

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 75, G03F 308, H04N 146

Patent

active

049281674

ABSTRACT:
Tone correction for input video signals is performed on the basis of look-up table data. The state of color tone is decided by using chroma signals each corresponding to one of input video signals, and a luminance signal produced from the input video signals. In response to the particular state decided, signals are produced by applying color correction level adjustment to the input video signals. A highlight point and a shadow point are set up based on one of such adjusted signals so as to produce look-up table data for each of the input video signals. This allows input video data to be subjected to tone correction which corresponds to particular photographing conditions, thereby eliminating overcorrection or undercorrection. Hence, the operator's decision as to the state of color tone is needless so that the ease of operation is promoted.

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