| 摘要 |
A quick image processor of reduced circuit scale for carrying out compression and expansion of image data, including a quantization-inverse quantization device which executes a quantization of the image data using quantization steps corresponding to frequency components and an inverse quantization of decoded data using the quantization steps. The quantization-inverse quantization device includes a first shifter for executing a predetermined bit number shift of input data, an add-subtract device for adding or subtracting the output of the first shifter to or from the input data, a look-up table device for multiplying the input data by a multiple previously stored therein, and a second shifter for executing a predetermined bit number shift of either the output of the add-subtract device or the output of the look-up table device, resulting in carrying out ready IC fabrication and improving approximation accuracy of the quantization steps.
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