Image processing device

Abstract

Abstract PURPOSE:To obtain an excellent reproduced picture with simple constitution by addressing a table with a signal detecting a picture tone of an image area of plural picture elements and selecting any of plural different picture processing means by means of an output signal. CONSTITUTION:A picture signal from a solid-state image pickup element 1 is quantized into a 6-bit digital picture signal by an A/D converter 2. Picture tone detection blodks 3, 4 detect picture density Lmax at a high level and a picture element density Lmin at a minimum level in a picture block consisting of plural picture elements respectively and its detection signal addresses a table 5. A binary-coding block 6 obtains the maximum value and the munimum value of the picture element density, and a binary-coded signal is inputted to a selection circuit 8 by selecting a slicing threshold value to obtain its intermediate density automatically. A binary-coded block 7 inputs a pseudo intermediate tone binary- coded signal to the circuit 8 by a dither matrix. A numeral value for a slice processing or dither processing is written in a table 5 based on the picture tone data, and the output of the block 6 or the block 7 is selected respectively depending on a density difference being over a prescribed value or below.

Inventors

• 👤 Hiroshi Tanioka
• 👤 宏 谷岡

Bibliographic Details