Data quantizing device for predicting whether or not quantized data will be 0 and image data compressing device using the same
AssigneeKawasaki Steel Corporation
InventorKazunari Akaogi
Life of this patent
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Abstract
The data quantizing device quantizes coefficients subjected to orthogonal transform using a quantizing table. The device includes a comparing unit for deciding whether or not quantized data will be ‘0’ by comparing the orthogonal transformed coefficients with corresponding coefficients in the quantizing table, and a control unit for controlling the quantization so that only the orthogonal transformed coefficients with the quantized coefficients of not ‘0’ are quantized. The image data compressing device employs this data quantizing device, and this results in not only curtailing power consumption but also increasing the processing speed.
Claims16
A data quantizing device for quantizing orthogonal transformed coefficients by using a quantizing table, comprising:
- a comparing unit for deciding whether or not quantized coefficients will be ‘0’ by comparing said orthogonal transformed coefficients with corresponding coefficients in said quantizing table;
- and
- a control unit for controlling so that only said orthogonal transformed coefficients with said quantized coefficients of not ‘0’ may be quantized.
An image data compressing device having
- a data quantizing device for quantizing orthogonal transformed coefficients by using a quantizing table, said data quantizing device comprising:
- a comparing unit for deciding whether or not quantized coefficients will be ‘0’ by comparing said orthogonal transformed coefficients with corresponding coefficients in said quantizing table;
- and
- a control unit for controlling so that only said orthogonal transformed coefficients with said quantized coefficients of not ‘0’ may be quantized.
Dependencies are inferred from the claim text.