Stripe noise correction method of captured image, photographing apparatus and electronic endoscopic apparatus

摘要

A stripe noise correction method of a captured image includes: storing a value calculated by rounding off a portion below the decimal point of a stripe noise value into a memory as correction data of an integer part that corrects a stripe noise for each color; and storing the magnitude of a quantization error calculated by rounding off for each color and for each pixel column or each pixel row into the memory as correction data of a fractional part; and correcting captured image signals of the image captured by a image sensor with the correction data of the integer part and the fractional part read from the memory.

主权项

1. A stripe noise correction method of a captured image comprising:
capturing, by a single-plate type image sensor for color image capturing that includes a plurality of pixels arranged in a square lattice array and a plurality of color filters with different colors which are respectively stacked on each of the pixels in a mosaic type, a plurality of images each of which has the same color with one of the colors of the color filters; calculating an average image for color images for the plurality of images and dividing the captured image signals of the average image into individual colors of the color filters; calculating, for each color, the stripe noise value for each pixel column or each pixel row by subtracting the average value of the captured image signals in the entire area where the pixels of the image sensor are arranged from the average value of the captured image signals of each pixel column or each pixel row of the image sensor; storing a value calculated by rounding off a portion below the decimal point of the stripe noise value into a memory as correction data of an integer part that corrects the stripe noise for each color; and storing the magnitude of a quantization error calculated by rounding off for each color and for each pixel column or each pixel row into the memory as correction data of a fractional part; and correcting the captured image signals of the image captured by the image sensor with the correction data of the integer part and the fractional part read from the memory.