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US 5,926,225 AGranted
Image coder which includes both a short-term frame memory and long-term frame memory in the local decoding loop
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsTakahiro Fukuhara, Kohtaro Asai
Life of this patent
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Abstract
An image coder comprises LTFM 13 storing a local decoded image Gk outputted from an adder 7 a predetermined period of time earlier than the local decoded image Gk stored to STFM 11. The motion compensation of an inputted image Gi is executed in reference to the local decoded image Gk stored by STFM 11 and LTFM 13.
Claims28
An image coder comprising:
- a local decoded image generator, quantizing a differential image produced by subtracting a predicted image from one of a series of inputted images, reverse-quantizing the quantized differential image and generating a local decoded image by adding the predicted image to the reverse-quantized differential image;
- a first memory, storing a first local decoded image generated by said local decoded image generator;
- a second memory, storing a second local decoded image generated by said local decoded image generator wherein only one of the first local decoded image and the second local decoded image contains a particular background image portion, in order to ensure two different reference images are stored;
- a predictor, determining the predicted image and a motion vector by executing motion compensation for the series of inputted images with reference to the first or second local decoded images stored by said first and second memories;
- and
- a coder, coding the quantized differential image from said local decoded image generator and the motion vector determined by said predictor.
3 more elements
An image decoder comprising:
- a decoded image generator, generating a series of decoded images by decoding a previously coded differential image and a motion vector, reverse-quantizing the decoded differential image and adding a predicted image to the reverse-quantized differential image;
- a first memory, storing a first decoded image generated by said decoded image generator;
- a second memory, storing a second decoded image generated by said decoded image generator wherein only one of the first local decoded image and the second local decoded image contains a particular background image portion, in order to ensure two different reference images are stored;
- and
- a predicted image generator, generating the predicted image based on the first or second decoded images stored in said first or said second memories and the motion vector decoded by said decoded image generator.
2 more elements
An image coder comprising:
- a local decoded image generator, generating first and second local decoded images from a series of inputted images wherein only one of the first local decoded image and the second local decoded image contains a particular background image portion, in order to ensure two different reference images are stored;
- a first memory, storing the first local decoded image generated by said local decoded image generator;
- a second memory, storing the second local decoded image generated by said local decoded image generator;
- a predictor, determining a predicted image and a motion vector by executing motion compensation for the series of inputted images with reference to the first or second local decoded images stored by said first and second memories;
- and
- a coder, coding a quantized differential image from the first or second local decoded images generated by said local decoded image generator and the motion vector determined by said predictor.
3 more elements
An image decoder comprising:
- a decoded image generator, generating first and second decoded images from a series of inputted images wherein only one of the first local decoded image and the second local decoded image contains a particular background image portion, in order to ensure two different reference images are stored and generating a motion vector;
- a first memory storing the first decoded image generated by said decoded image generator;
- a second memory storing the second decoded image generated by said decoded image generator;
- and
- a predicted image generator, generating a predicted image based on the first or second decoded images stored in said first or said second memories and the motion vector decoded by said decoded image generator.
2 more elements
Dependencies are inferred from the claim text.