| 摘要 |
<p>PURPOSE:To prevent the deterioration in resolution due to an approximation from being generated by approximately expressing three-color image data only by means of reference color data for approximately one color, and approximately reproducing the picture element values of the other two colors from the polynomial of a reference color picture element value. CONSTITUTION:After three-color resolution scanning, a color original picture 1 is converted to red, green and blue digital images (Rij), (Gij) and (Bij) by being sampled and quantized. Next, a certain color among the three colors, for example, a green picture element value Gij is set to a reference color, and picture element values Rij and Bij of the other two colors are encoded so as to be approximately expressed. The encoding is executed by driving the Rij and Bij into blocks setting MXN picture elements to a unit. Namely, with respect to the divided k-th block (k=1, 2...). The Rij and Bij are described by the L-order polynomial setting the Gij to a variable. Only the expansion coefficient value of polynomial expansion is transmitted for every block, and the original picture element value of two colors is approximately reproduced from the reference color picture element value and expansion coefficient value at a receiving side. Thus, the resolution deterioration of the image is not generated at the time of reproducing.</p> |
