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Method for encoding a sequence of digitized images

An image and coding technology, applied in the fields of encoders and decoders, can solve problems such as underutilization of correlation, and achieve the effect of good prediction and high coding efficiency

Active Publication Date: 2011-07-13
SIEMENS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Here, the existing correlations between successive individual images are underutilized

Method used

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  • Method for encoding a sequence of digitized images
  • Method for encoding a sequence of digitized images
  • Method for encoding a sequence of digitized images

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Embodiment Construction

[0031] The following is based on figure 1The principle of the encoding according to the invention is described on the basis of a segment of a sequence of digitized images comprising three temporally consecutive images I1 , I2 and I3 . The sequence of images can be pictures of a medical imaging system, for example. The individual images can be, in particular, cross-sectional photographs of an organ of a patient which have been detected using computed tomography. Such systems generate very large data volumes, which must be stored losslessly or nearly losslessly for archiving purposes.

[0032] according to figure 1 Each individual image I1, I2 or I3 of the digitized image sequence of , contains a plurality of pixels in the form of pixels, wherein each pixel is assigned a pixel value, which in the case of a black-and-white photograph is white luminance value (Helligkeitswert) and, in the case of color photographs, usually luminance value (Luminanzwert). exist figure 1 In , e...

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Abstract

The invention relates to a method for encoding a sequence of digitized images (I1, I2, I3) comprising a plurality of pixels (P, P', P'') having associated pixel values, wherein pixels (P, P', P'') of the images (I1, I2, I3) to be encoded are predicted and wherein the prediction errors resulting from the prediction are encoded. The prediction of a pixel (P, P', P'') to be encoded for at least a part of the pixels (P) to be encoded is done by determining a plurality of trajectories (T, T'), wherein each of the trajectories (T, T') runs through the pixel (P) to be encoded and through other previously encoded pixels (P') from the image (I3) of the pixel (P) to be encoded and / or from one or more images (I1, I2) that are temporally proximate to the image (I3) of the pixel (P) to be encoded. For each of the trajectories (T, T') determined, a valuation parameter is determined that is configured in such a way that the smaller the deviations in the uncoded pixel values (w1, w2) of the other pixels (P') along a trajectory (T, T'), the higher is the trajectory (T, T') evaluated according to the valuation parameter. A prediction value for the pixel value of the pixel (P) to be encoded is determined based on the other pixels (P') of the trajectory (T, T') with the highest valuation. A preferred area of application of the method according to the invention is encoding of digitized images in the form of medical photographs, in particular medical X-ray photographs, for example computer tomography photographs.

Description

technical field [0001] The invention relates to a method for encoding a sequence of digitized images comprising a plurality of pixels with assigned pixel values, as well as a corresponding decoding method and corresponding encoders and decoders. Background technique [0002] In a large number of technical fields of application it is desirable to compress digitized images as best as possible with as little loss as possible in order thereby to keep the storage space for the images small. In addition, it is often necessary to retrieve large data-volume digitized image sequences from the memory via the transmission network as quickly as possible even with limited network bandwidth, wherein a slight loss when compressing the image data is acceptable if necessary. [0003] Digitized image sequences occur in particular in medical applications in which, for example, in the case of computer tomography (CT) radiographs, a sequence of two-dimensional sectional images of an organ of an ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T9/00H04N7/26
CPCH04N19/00715H04N7/366H04N19/573H03M7/3002
Inventor J·潘德尔P·阿蒙
Owner SIEMENS AG