Dai Nippon Printing Co., Ltd.

Kyouji Yoshino

Motonobu Tonomura

Hajime Seino

Interpolation of signed values A and B is efficiently performed by simple circuitry. To calculate an interpolated value C based on a 4-bit values A (bits aaaa) and B (bits bbbb) expressing a negative number by twos complement notation and a 4-bit interpolation rate D (bits dddd) consisting of only a decimal part, a basic expression of C=(1&#x2212;D)*A+D*B is transformed into an expression composed of an unsigned part that includes a sum of products with a bit dor a logically inverted value eof the bit d(i=0, 1, 2, and 3), and indicates an absolute value of the interpolated value C, and a signed part indicating a sign of the interpolated value C. Then, 7 bits of bits cthrough care generated from an arithmetic operation of the unsigned part, and logic judgement of the signed part is performed by considering a carry from the digit of the bit cof the arithmetic operation of the unsigned part to generate a bit c. Significant digits of the obtained 8-bit value (bits cthrough c) are outputted as an interpolated value.

Interpolator and designing method thereof

An interpolation process for scaling is performed directly on raw data from an image pickup apparatus. Raw data, constituted by inputted Bayer pattern array are as a set of pixels positioned on respective lattice points on a square lattice. A position of an interpolation point Q is designated by an upper address that indicates a lattice point near the upper left and a lower address that indicates a position inside a lattice frame, a specific color is designated for which a pixel value is to be determined. An interpolation reference frame is determined, formed of a smallest square, which contains the interpolation point Q and with which the four vertices are formed by lattice points of the designated color, and an interpolation origin, constituted by the upper left lattice point of the interpolation reference frame, interpolation proportions d* and e* are determined. An interpolation calculation is performed.

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Tokyo, Japan

Kyouji Yoshino