Device for determining a quantizing number of an image signal

Details Device for determining a quantizing number of an image signal Device for determining a quantizing number of an image signal

1996-05-17

1998-10-13

Tran, Phuoc

Image analysis

Image compression or coding

Transform coding

382239, 382251, G06K 936, G06K 946

Patent

active

058224610

ABSTRACT:
A device for determining quantizing number of an image signal comprises a discrete cosine transformation for generating a discrete cosine transformation signal by transforming image data, a segment delay unit for delaying the discrete cosine transformation signal for prescribed time, a quantization unit for quantizing data output from the segment delay unit, a variable coding unit for variably coding data output from the quantizing unit, a formatter for converting data output from the variable coding unit into an appropriate form, an activity calculation unit for counting a number of a discrete cosine transformation signal in a macro block unit and for calculating activity, a target bit calculation unit for calculating a target bit based on the data output from the activity calculation unit, a code length calculation unit for calculating quantizing and a code length of said discrete cosine transformation signal, the code length calculation unit quantizing and variably coding the discrete cosine transformation coefficient of the discrete cosine transformation, a comparison unit for comparing the code length signal multiple calculated by the code length calculation unit with the target bit calculated by the target bit calculating unit, and a quantizing number determination unit for determining a quantizing number based on data output from the comparison unit and for outputting quantizing number to the quantization unit.

REFERENCES:
patent: 5051840 (1991-09-01), Watanabe et al.
patent: 5263100 (1993-11-01), Kim et al.
patent: 5333012 (1994-07-01), Singhal et al.

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