Picture data processing apparatus
AssigneeSony Corporation
InventorTakayuki Sakamoto
Life of this patent
Estimating the term…
Abstract
A picture data processing apparatus, which is suitably applied, for instance, to a television conference system in which picture data are transmitted in the form of codes prevents, deterioration of the picture quality even if an edge in the picture data exits. In the apparatus, the presence or absence of an edge is detected for each block, and when a block having an edge is detected, a Wavelet transform is employed in transmission of the picture data, whereas a discrete cosine transform is employed when the block has no detected edge.
Claims4
A picture data processing apparatus which transmits picture data after being coded for division into a predetermined number of blocks, comprising:
- edge detection means for detecting a presence of an edge in each one of said blocks;
- discrete cosine transform means for discrete cosine transforming said picture data for each one of said blocks of said picture data, when the presence of an edge is not detected by said edge detection means;
- and
- Wavelet transform means for Wavelet transforming each one of said blocks of said picture data, when the presence of an edge is detected by said edge detection means.
A picture data processing method in which picture data is transmitted after being coded for division into a predetermined number of blocks, comprising the steps of:
- detecting a presence of an edge in each one of said blocks;
- discrete cosine transforming said picture data for each one of said blocks, when the presence of an edge is not detected;
- and
- Wavelet transforming said picture data, when the presence of an edge is detected.
Dependencies are inferred from the claim text.