| 摘要 |
PURPOSE:To compress a color image and to shorten a transmission time, by applying quantization on the predicted remainder of a luminance signal and plural color difference signals. CONSTITUTION:In an image compressing and encoding circuit 10, the compressive encoding of the luminance signal and each of the color difference signals are performed. In such case, at a differential circuit 35, a first-order difference between the lines of the restored value of a preceding line or the predicted value of a present line from a prediction circuit 36 and the sample of the present line, is taken, and the first-order difference is encoded in a line direction by a variable sample density compression circuit 37. At this time, a second difference between the picture elements between a present sample and a preceding sample or the predicted value of the present sample can be obtained, and encoding is performed based on size relation with a quantization level. Therefore, since the directions of the first-order difference between the lines and the second- order difference between the picture elements are set in an orthogonal direction, correlation in a vertical and a horizontal directions can be eliminated.
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