Image signal processing apparatus
View Patent ↗An image signal processing apparatus includes a line separation circuit. When interpolated image data is generated based on low resolution raw image data having color information distributed on a pixel of each line in the order of R, G, G, B, . . . , firstly, the line separation circuit converts a color distributing manner using two line memories. As a result of a conversion, the color information is distributed on the pixel of an odd number line in the order of R, G, R, G, . . . , and the color information is distributed on the pixel of an even number line in the order of G, B, G, B, . . . . Such a color separation toward the low resolution raw image data is performed using three line memories. On the other hand, when the interpolated image data is generated based on high resolution raw image data having the color information distributed on the pixel of the odd number line in the order of R, G, R, G, . . . , and the color information distributed on the pixel of the even number line in the order of G, B, G, B, . . . , the conversion of the color distribution is not performed, and the color separation is executed using all of the five line memories.
1. An image signal processing apparatus provided with K of line memories, and applying a signal process to a first image signal having a plurality of colors of color information in which one color is assigned to one pixel in a first manner, and a second image signal having the plurality of colors of color information in which one color is assigned to one pixel in a second manner, comprising:
a converter for converting a color distribution of the first image signal from the first manner to the second manner using L of line memories forming said K of line memories;
a first color separator for applying another color separation to the first image signal having the color distribution converted by said converter using M (=K−L) of line memories forming said K of line memories; and
a second color separator for applying a color separation to the second image signal using said K of line memories.
2. An image signal processing apparatus according to claim 1 , wherein the first manner is a manner in which the plurality of colors of color information are distributed across N (≦L) lines, and the second manner is a manner in which the plurality of colors of color information are distributed across the L lines.
3. An image signal processing apparatus according to claim 1 , wherein said first color separator includes a first interpolator for generating by each one line an interpolated image signal formed of each pixel having the plurality of colors of color information based on the first image signal read out from said L of line memories.
4. An image signal processing apparatus according to claim 1 , wherein said second color separator includes a second interpolator for simultaneously generating a plurality of lines of an interpolated image signal formed of each pixel having the plurality of colors of color information based on the second image signal read out from said K of line memories, and a noise remover for generating one line of the interpolated image signal having a noise removed based on the plurality of lines of interpolated image signal generated by said second interpolator.
5. An image signal processing apparatus according to claim 1 , wherein the first image signal has a resolution lower than that of the second image signal.
6. An image signal processing apparatus according to claim 5 , wherein said first image signal is a moving image signal, and said second image signal is a still image signal.
7. A signal processing method of an image signal processing apparatus provided with K of line memories, and applying a signal process to a first image signal having a plurality of colors of color information in which one color is assigned to one pixel in a first manner, and a second image signal having the plurality of colors of color information in which one color is assigned to one pixel in a second manner, comprising steps of:
(a) converting a color distribution of the first image signal from the first manner to the second manner using L of line memories forming said K of line memories;
(b) applying a color separation to the first image signal having the color distribution converted by said step (a) using M (=K−L) of line memories forming said K of line memories; and
(c) applying another color separation to the second image signal using said K of line memories.
8. A signal processing method of an image signal processing apparatus provided with a plurality of line memories, and applying a signal process to a first image signal having a plurality of colors of color information in which one color is assigned to one pixel in a first manner, and a second image signal having the plurality of colors of color information in which one color is assigned to one pixel in a second manner, comprising steps of:
(a) converting a color distribution of the first image signal from the first manner to the second manner using a portion of said plurality of line memories;
(b) applying a color separation to the first image signal having the color distribution converted by said step (a) using another portion of said plurality of line memories; and
(c) applying another color separation to the second image signal using said plurality of line memories.