Image processing method

Abstract

Abstract PURPOSE:To generate a histogram by limiting an area to a partial area including significant information and to effectively enhance the contrast of a significant area not depending on the density of a part other than that by deforming the maximum gradient of a transformation function to a value less than a preset value depending on the density. CONSTITUTION:The maximum gradient of a density transformation function is deformed so as to go to the value less than the preset value depending on the density to suppress contrast intensity occupying a large area on an image but of unrequired range. Such value can be obtained by limiting the frequency value of an original histogram at the value less than the preset value depending on the density. Also, the minimum gradient of the density transformation function is deformed so as to go to the value exceeding the preset value depending on the density to prevent the diminution of the contrast occupying a small area on the image but of significant density range. Such value can be obtained by limiting the frequency value of the original histogram less than the preset value depending on the density. In such a way, it is possible to enhance the contrast of the image without diminishing the contrast of the significant density area.

Inventors

• 👤 Kazuko Terada
• 👤 寺田　和子
• 👤 Akihide Hashizume
• 👤 明英 橋詰
• 👤 Kazuo Aisaka
• 👤 一夫 相坂
• 👤 Ryuichi Suzuki
• 👤 隆一 鈴木

Bibliographic Details