Image analysis – Image compression or coding – Adaptive coding
Patent
1997-01-29
1998-02-17
Boudreau, Leo
Image analysis
Image compression or coding
Adaptive coding
382261, G06K 936, G06K 946
Patent
active
057199620
ABSTRACT:
An image representing input signal is processed so the data therein are filtered in a predetermined manner to derive a filtered signal. The values of the filtered signal are combined at successive time intervals, and the values are combined so there is an addition of a function of values of the filtered signal at the successive time intervals to derive a combined signal. The combined signal is converted into a signal representing a predicted number of bits in a frame of the image. In response to the signal representing a predicted number of bits in a frame of the image, a signal representing the magnitude of a control for quantization step size is derived which is as a function of an error between the predicted number of bits and a predetermined target value therefor. A function of the input signal data is orthogonally transformed so a transformed signal is derived. Output data represented by the transformed signal are quantized so they have quantized step size determined by the control signal representing the magnitude of a quantization step size and there is a reduction in the number of data bits for the image relative to the number of data bits in the input signal.
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Ando Ichiro
Sugahara Takayuki
Boudreau Leo
Tran Phuoc
Victor Company of Japan Ltd.
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