US 6,205,251 B1Granted

Device and method for decompressing compressed video image

AssigneeWinbond Electronics Corp.

InventorsTsung-Hsien Hsieh, Rong-Fu Hsu

Life of this patent

Estimating the term…

Loading patent…

Abstract

A method and device for decompressing a compressed video image and capable of enlarging or contracting the image at the same time. The method utilizes an enhancement/contraction pre-processor to perform enlargement or contraction processing on the compressed data in the vertical direction. Then, at a later stage, an enhancement/contraction post-processor is used to perform enlargement or contraction processing on the decompressed data in the horizontal direction. By dividing the whole video image into a number of rows and dealing with each row sequentially, memory for storing a single row of video data is only required. Therefore, a whole image can be decompressed without using large amount of memory for storing the decompressed data; a large amount of memory is saved.

Claims10

Dependent claims

A device for decompressing compressed image data that has a line-end-code and is capable of being enlarged or contracted according to a prescribed ratio, comprising:

an enlargement/contraction pre-processor for receiving compressed image data and sending out a row control signal and a row compressed data according to the line-end-code and the enlargement/contraction ratio;
a compressed data buffer coupled to the enlargement/contraction pre-processor for processing the incoming row compressed data following the instructions from the row control signal, and then sending out duplicated, eliminated or unchanged row compressed data thereafter;
a variable length decoder coupled to the compressed data buffer for receiving the row compressed data, decompressing the row compressed data to form a row image data and then sending out the row image data;
a decompressed data buffer coupled to the variable length decoder for temporary storage of the row image data;
and
an enlargement/contraction post-processor coupled to the decompressed data buffer for receiving a whole line of the row image data, and then sending out after the whole line of the row image data is enlarged or contracted accordingly to the enlargement/contraction ratio.

3 more elements

Dependencies are inferred from the claim text.