Back to results
US 2015/0312542 A1Published application
Signal conversion apparatus and method, and program and recording medium
AssigneeMitsubishi Electric Corporation
InventorsHidetsugu SUGINOHARA, Hideki YOSHII, Satoshi YAMANAKA
Life of this patent
Estimating the term…
Abstract
A maximum value Yimax and a minimum value Yimin of input pixel data Ri, Gi, Bi for each pixel are determined. A saturation adjustment value X is determined using a function g (Yimax, Yimin), white pixel data Wo is determined using a function f (Yimin), and these are used to determine output pixel data Ro, Go, Bo. Even the saturation represented by RGB three-color data is high, conversion to RGBW four-color data with improved brightness can be made, without changing the hue.
Claims10
A signal conversion apparatus comprising:
- a pixel value comparison unit for outputting a maximum value Yimax and a minimum value Yimin of input pixel data Ri, Gi, Bi of red, green and blue for each pixel;
- a saturation adjustment value calculation unit for determining a saturation adjustment value X by using a first function g (Yimax, Yimin) which does not exceed an upper limit L which is given from the maximum value Yimax, and the minimum value Yimin, by:
- L
- =
- Yi
-
-
- max
- ×
- Yi
-
-
- min
- Yi
-
-
- max
- -
- Yi
-
-
- min
- [
- Mathematical
-
-
- Expression
-
-
- 25
- ]
- a three-color pixel value calculation unit for determining output pixel data Ro, Go, Bo, by using the input pixel data Ri, Gi, Bi, the maximum value Yimax, and the saturation adjustment value X, by:
- Ro
- =
- Ri
- ×
- (
- X
- +
- Yi
-
-
- max
- )
- Yi
-
-
- max
- -
- X
-
-
- Go
- =
- Gi
- ×
- (
- X
- +
- Yi
-
-
- max
- )
- Yi
-
-
- max
- -
- X
-
-
- Bo
- =
- Bi
- ×
- (
- X
- +
- Yi
-
-
- max
- )
- Yi
-
-
- max
- -
- X
- [
- Mathematical
-
-
- Expression
-
-
- 26
- ]
- and
- a white pixel value calculation unit for determining white pixel data Wo from the minimum value Yimin by using a second function f (Yimin);
- wherein
- when the saturation adjustment value X is larger than the white pixel data Wo, the saturation represented by the output pixel data Ro, Go, Bo and the white pixel data Wo is made higher than the saturation represented by the input pixel data Ri, Gi, Bi, and
- when the saturation adjustment value X is smaller than the white pixel data Wo, the saturation represented by the output pixel data Ro, Go, Bo and the white pixel data Wo is made lower than the saturation represented by the input pixel data Ri, Gi, Bi.
101 more elements
A signal conversion method comprising:
- a pixel value comparison step for outputting a maximum value Yimax and a minimum value Yimin of input pixel data Ri, Gi, Bi of red, green and blue for each pixel;
- a saturation adjustment value calculation step for determining a saturation adjustment value X by using a first function g (Yimax, Yimin) which does not exceed an upper limit L which is given from the maximum value Yimax, and the minimum value Yimin, by:
- L
- =
- Yi
-
-
- max
- ×
- Yi
-
-
- min
- Yi
-
-
- max
- -
- Yi
-
-
- min
- [
- Mathematical
-
-
- Expression
-
-
- 27
- ]
- a three-color pixel value calculation step for determining output pixel data Ro, Go, Bo, by using the input pixel data Ri, Gi, Bi, the maximum value Yimax, and the saturation adjustment value X, by:
- Ro
- =
- Ri
- ×
- (
- X
- +
- Yi
-
-
- max
- )
- Yi
-
-
- max
- -
- X
-
-
- Go
- =
- Gi
- ×
- (
- X
- +
- Yi
-
-
- max
- )
- Yi
-
-
- max
- -
- X
-
-
- Bo
- =
- Bi
- ×
- (
- X
- +
- Yi
-
-
- max
- )
- Yi
-
-
- max
- -
- X
- [
- Mathematical
-
-
- Expression
-
-
- 28
- ]
- and
- a white pixel value calculation step for determining white pixel data Wo from the minimum value Yimin by using a second function f (Yimin);
- wherein
- when the saturation adjustment value X is larger than the white pixel data Wo, the saturation represented by the output pixel data Ro, Go, Bo and the white pixel data Wo is made higher than the saturation represented by the input pixel data Ri, Gi, Bi, and
- when the saturation adjustment value X is smaller than the white pixel data Wo, the saturation represented by the output pixel data Ro, Go, Bo and the white pixel data Wo is made lower than the saturation represented by the input pixel data Ri, Gi, Bi.
101 more elements
Dependencies are inferred from the claim text.