To reproduce high-quality images by brightness adjustment even for an image which has a difference in brightness and darkness as large as that of an image obtained by an electronic endoscope.
A luminance distribution image representing the luminance distribution of the image is produced. The luminance distribution image is produced by generating a luminance image composed of the luminance components of the image and then blurring it for instance (S301-303). Then, an adjustment amount of a brightness level is determined for each pixel based on the value of each pixel of the luminance distribution image (S304). Further, a portion contributing to adjustment of brightness and a portion contributing to adjustment of saturation are determined for each pixel (S305), and a brightness adjustment value and a saturation adjustment value corresponding to the portion are added to the pixel value of the original image (S306).
ABE KAZUNORI
FUJINON CORP
| JPH034832A | 1991-01-10 | |||
| JPH1169181A | 1999-03-09 |
Go Sakuma
Mari Shigematsu
Next Patent: SHARPNESS ADJUSTMENT METHOD, PROGRAM AND ELECTRONIC ENDOSCOPE APPARATUS