Image compression method
OwnerAntti Latva-Ahoinventor
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Abstract
The invention relates to a method in image processing, wherein an image in digital form is in coding phase compressed, quantized by a quantization matrix (QL, QC) and coded by a coding matrix (HL1, HK1, HL2), wherein one or more data frames are formed. In a decoding phase decoding, dequantization and decompression is carried out to the information comprised in the data frame. One or more matrices (QL, QC, HL1, HK1, HL2) used in the coding phase are left out of the data frame, wherein the corresponding matrix is stored into coding device (8) performing the decoding phase.
Claims8
A method in image processing, in which method an image in digital form is in coding phase compressed, quantized by a quantization matrix (QL, QC) and coded by a coding matrix (HL1, HK1, HL2), wherein one or more data frame is formed, and in decoding phase decoding, dequantization and decompression is carried out to the information comprised in the data frame, characterized in that one or more matrices (QL, QC, HL1, HK1, HL2) used in the coding phase are left out of the data frame, wherein the corresponding matrix is stored into a coding device (8) performing the decoding phase.
A device, preferably a mobile station (13), comprising means (8) for processing an image in digital form and means (12) for showing the image to the user, which image in digital form has in the coding phase been compressed, quantized by a quantization matrix (QL, QC) and coded by a coding matrix (HL1, HK1, HL2) to form one or more data frames (300), and which image treating means (8) comprise means (9, 10, 11) for decoding, dequantization and decompression of the information comprised in the data frame (300), characterized in that the image processing means (8) further comprise means (14) with which the matrix (QL, QC, HL1, HK1, HL2) used in the coding phase and left out of the data frame is stored and used in the decoding of image.
Dependencies are inferred from the claim text.