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Abstract

An apparatus for highly efficient encoding of a digital image signal comprising frames of pixels converts the digital image signal into a blocked signal, sub-samples the blocked signal to reduce the number of pixels in each block by one-half and then performs adaptive dynamic range coding (ADRC) and frame dropping on the sub-sampled signal. The ADRC compresses the amount of pixel data in a first frame to half of a two-frame target value by subtracting the minimum value of the pixels in a block from each of pixels in the block, then representing each of the resultant pixel data values with a smaller number of bits than was originally used. This smaller number is determined based on the dynamic range of the block and the target value. A second frame following the first frame is dropped if it is detected as a stationary frame, or is compressed using ADRC to the two-frame target value reduced by the amount of data generated for the first frame if detected as a non-stationary frame.

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First Claim