Coded data length detection apparatus, method of the same,...

Details Coded data length detection apparatus, method of the same,... Coded data length detection apparatus, method of the same,...

2005-02-22

2005-02-22

Johns, Andrew W. (Department: 2622)

Image analysis

Image compression or coding

Lossless compression

C382S251000

Reexamination Certificate

active

06859562

ABSTRACT:
A coded data length detection apparatus and method capable of detecting a coded data length at a high accuracy at a high speed, wherein original image data input to an image compression and coding circuit is processed by DCT at a DCT unit and quantized at a quantizer, quantization coefficients at this time is obtained by switching first set of scale coefficients and second set of scale coefficients in a lattice pattern in units of MCU of an image in scale coefficients switch, Huffman coding is performed on a quantized result at a Huffman coding unit, a data length is counted at a first compressed data length counter or a second compressed data length counter, and the counted data lengths is respectively multiplied by 2× at a first double multiplier or a second double multiplier to find a data length at the time of encoding the entire image by the respective scale factors.

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