Method for reversibly transforming data format, image processing apparatus, program for reversibly transforming data format, and computer-readable recording medium thereof

The method as claimed in claim 16 wherein the first unit system is a first color space having the lower resolution level and the second unit system is a second color space having the higher resolution level,

• wherein in a case of conducing a color conversion in accordance with an international standard in which the data format for converting an analog video signal into digital data is specified, by using the first color space as the common unit system, the reversible data conversion is conducted by the integer operation, so that the backward transformation from first data in the first color space to second data in the second color space and the forward transformation from the second data in the second color space to third data in the first color space are conducted and the first data corresponds to the third data.

An apparatus for reversibly converting a data format in that a forward transformation and a backward transformation are reciprocally conducted for data between unit systems having different resolution levels, comprising a data format reversibly converting part for reversibly converting a data format,

• wherein in the forward transformation and the backward transformation, a first unit system having a lower resolution level is used as a common unit system, and a reversible data conversion is conducted by an integer operation for data in the first unit system having the lower resolution level and data in a second unit system having a higher resolution level higher than the first unit system.

A computer-executable program to cause a computer to reversibly transform a data format, in that a forward transformation and a backward transformation are reciprocally conducted for data between unit systems having different resolution levels,

• wherein in the forward transformation and the backward transformation, a first unit system having a lower resolution level in used as a common unit system, and a reversible data conversion is conducted by an integer operation for data in the first unit system having the lower resolution level and data in a second unit system having a higher resolution level higher than the first unit system.

A computer-readable recording medium recording program code to cause a computer to reversibly transform a data format, in that a forward transformation and a backward transformation are reciprocally conducted for data between unit systems having different resolution levels,

• wherein in the forward transformation and the backward transformation, a first unit system having a lower resolution level is used as a common unit system, and a reversible data conversion is conducted by an integer operation for data in the first unit system having the lower resolution level and data in a second unit system having a higher resolution level higher than the first unit system.