Image coding apparatus and image coding method to generate a targeted amount of code
AssigneeSony Corporation
InventorsTakaaki Fuchie, Shojiro Shibata
Life of this patent
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Abstract
An image coding apparatus for coding image data. The image coding apparatus includes: a first coding mechanism predicting a quantization parameter and a quantization matrix to be used for calculating a target amount of code for the image data by coding the image data; a second coding mechanism correcting the quantization parameter predicted by the first coding means from an error between an amount of generated code produced by coding using the quantization parameter and the quantization matrix predicted by the first coding mechanism and the target amount of code; and a third coding mechanism coding the image data using the quantization parameter corrected by the second coding mechanism.
Claims8
An image coding apparatus for coding image data, comprising:
- first coding means for predicting a quantization parameter and a quantization matrix to be used for calculating a target amount of code for the image data by coding the image data;
- second coding means for correcting the quantization parameter predicted by the first coding means from an error between an amount of generated code produced by coding using the quantization parameter and the quantization matrix predicted by the first coding means and the target amount of code;
- and
- third coding means for coding the image data using the quantization parameter corrected by the second coding means.
A method of coding an image, comprising the steps of:
- first coding for predicting a quantization parameter and a quantization matrix to be used for calculating a target amount of code for the image data by coding the image data;
- second coding for correcting the quantization parameter predicted by the step of first coding from an error between an amount of generated code produced by coding using the quantization parameter and the quantization matrix predicted by the step of first coding and the target amount of coding;
- and
- third coding for coding the image data using the quantization parameter corrected by the step of second coding.
An image coding apparatus for coding image data, comprising:
- a first coding mechanism predicting a quantization parameter and a quantization matrix to be used for calculating a target amount of code for the image data by coding the image data;
- a second coding mechanism correcting the quantization parameter predicted by the first coding means from an error between an amount of generated code produced by coding using the quantization parameter and the quantization matrix predicted by the first coding mechanism and the target amount of code;
- and
- a third coding mechanism coding the image data using the quantization parameter corrected by the second coding mechanism.
Dependencies are inferred from the claim text.