Patent ID: 9147227
Filing Date: 2015-09-29
Classification: G06T,H04N

Abstract:
1. An image signal processing device comprising: a first determination circuit configured to, when pixel signals of three pixels in reference pixel signals of R or B used for producing an interpolation pixel signal of G in a pixel position of a pixel signal of R or B where a pixel signal of G is not present in pixel signals of R, G and B output from an imaging device including a color filter of a Bayer array, are defined as first to third R/B pixel signals in order of time, decide between a first case and a second case, the first case indicating a change including an increase from the first R/B pixel signal to the second R/B pixel signal and a decrease from the second R/B pixel signal to the third R/B pixel signal or a change including a decrease from the first R/B pixel signal to the second R/B pixel signal and an increase from the second R/B pixel signal to the third R/B pixel signal, the second case indicating a monotonous increase or a monotonous decrease of the first to third R/B pixel signals; a G interpolation circuit configured to, when three pixel signals including the interpolation pixel signal of G and two pixel signals of G interposing the interpolation pixel signal of G therebetween are defined as first to third G pixel signals in order of time, produce the interpolation pixel signal of G in such a manner as to add, to an average value of the first G pixel signal and the third G pixel signal, a value obtained by multiplying a difference between the second R/B pixel signal and an average value of the first R/B pixel signal and the third R/B pixel signal by a ratio of a distance between the first G pixel signal and the third G pixel signal to a distance between the first R/B pixel signal and the third R/B pixel signal when the first determination circuit selects the first case, and produce the interpolation pixel signal of G in a manner such that a shape obtained by connecting each pixel position of the first, second and third R/B pixel signals resembles a shape obtained by connecting each pixel position of the first, second and third G pixel signals when the first determination circuit selects the second case; a second determination circuit configured to, when pixel signals of three pixels in reference pixel signals of G or reference interpolation pixel signals of G used for producing an interpolation pixel signal of R or B in each of a pixel position of a pixel signal of G where pixel signals of R and B are not present, a pixel position of a pixel signal of R where a pixel signal of B is not present, and a pixel position of a pixel signal of B where a pixel signal of R is not present in the pixel signals of R, G and B output from the imaging device, are defined as fourth to sixth G pixel signals in order of time, decide between the first case and the second case, the first case indicating a change including an increase from the fourth G pixel signal to the fifth G pixel signal and a decrease from the fifth G pixel signal to the sixth G pixel signal or a change including a decrease from the fourth G pixel signal to the fifth G pixel signal and an increase from the fifth G pixel signal to the sixth G pixel signal, the second case indicating a monotonous increase or a monotonous decrease of the fourth to sixth G pixel signals; and an R/B interpolation circuit configured to, when three pixel signals including the interpolation pixel signal of R or B and two pixel signals of R or B interposing the interpolation pixel signal of R or B therebetween are defined as fourth to sixth R/B pixel signals in order of time, produce the interpolation pixel signal of R or B in such a manner as to add a difference between the fifth G pixel signal and an average value of the fourth G pixel signal and the sixth G pixel signal to an average value of the fourth R/B pixel signal and the sixth R/B pixel signal when the second determination circuit selects the first case, and produce the interpolation pixel signal of R or B in a manner such that a shape obtained by connecting each pixel position of the fourth, fifth and sixth G pixel signals resembles a shape obtained by connecting each pixel position of the fourth, fifth and sixth R/B pixel signals when the second determination circuit selects the second case.