초록 ▼

A linear interpolating method and apparatus for signals in a memory wherein first signals are converted into second signals by addressing in at least four-dimensional fashion, for use in a color picture processing machine such as a color scanner, a color facsimile, a color T.V. monitor, and other si

A linear interpolating method and apparatus for signals in a memory wherein first signals are converted into second signals by addressing in at least four-dimensional fashion, for use in a color picture processing machine such as a color scanner, a color facsimile, a color T.V. monitor, and other signal processing machine converting coordinates of signals with at least four variables, are disclosed. The second signals corresponding to certain stepped values of the first signals are read out of the memory, and then the values of the read signals are interpolated at an interpolation point positioned therebetween. At least four-dimensional interpolation unit space is divided into at least four-dimensional dissection spaces, and then it is discriminated which of the dissection spaces includes the interpolation point. Then, the interpolated value at the interpolation point is obtained as a weighted sum of the values at the vertices of the discriminated dissection space.

대표청구항 ▼

A color conversion apparatus for use in a linear interpolation method, comprising: (a) means for separating each of (p+q) bits of digital subtractive primary colors such as cyan, magenta, yellow and black into two sets, one set of which is an address signal of p bits of the higher order (for C, M, Y

A color conversion apparatus for use in a linear interpolation method, comprising: (a) means for separating each of (p+q) bits of digital subtractive primary colors such as cyan, magenta, yellow and black into two sets, one set of which is an address signal of p bits of the higher order (for C, M, Y, and K) for calling additive primary color signals and the other is for the lower-order q bits (for c, m, y, and k); (b) a comparator for comparing relative magnitudes of c, m, y, and k and generating an output signal which is a function of said relative magnitudes; (c) means for monitoring the output signals of the comparator and determining, as a function of said relative magnitudes, to which of said higher-order address signals C, M, Y, or K a unit value is to be added; (d) memory means for preliminarily storing additive primary signals corresponding to all combinations of said p bits in the higher-order address signals, and outputting five of said additive primary signals in response to address signals output by said monitoring means; (e) means for calculating five sets of coefficients (1-c, 1-m, 1-y, 1-k), (1-m, c-y, c-k, m-k, m-c, y-k, y-c, y-m, k-c, k-m, k-y), (m-y, m-k, m-c, y-k, y-c, y-m, k-c, k-m, k-y, c-m, c-y, c-k), (y-k, y-c, y-m, k-c, k-m, k-y, c-m, c-y, c-k, m-y, m-k, m-c) and (k, c, m, y), from the q bits of the lower-order signals and for selecting five of said coefficients as a function of said output signal of the comparator, and outputting signals corresponding to said coefficients, (f) a plurality of multipliers for multiplying each of said coefficient signals by each of the corresponding additive primary color signals read from said memory means, and (g) an adder for adding higher-order bits obtained by the multiplication of said signals in said multipliers.