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Method and device for determining image quality

An image quality and image technology, applied in image communication, television, electrical components, etc., can solve problems such as disconnection of deblocking filters, and achieve the effect of determining image quality, reducing computational complexity, and saving memory space

Inactive Publication Date: 2012-11-07
SIEMENS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reason for this is that the corresponding transform coefficients are not cancelled, due to the correspondingly high magnitude, and the deblocking filter is switched off in the case of high contrast

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  • Method and device for determining image quality
  • Method and device for determining image quality
  • Method and device for determining image quality

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Embodiment Construction

[0043] exist figure 1 The steps of encoding and decoding image data and images are generally shown in . A sequence UBZ of uncoded images U1 , U2 , . The coding method works, for example, according to the video coding standard ITU-T H.264 or H.263 (ITU-International Telecommunication Union, International Telecommunication Union). The coded data stream comprises coded data information EBI1 , EBI2 , . In a next step, the encoded data stream is assigned to a predictive decoding method DV corresponding to the predictive encoding method EV, which generates from the encoded data stream EBZ a plurality of images B1, ..., A sequence of images of Bn, where images B1,...,Bn represent reconstructed images. Coding by means of predictive coding methods generally results in a loss of image information.

[0044] Embodiments of the present invention are further described below. In this case, the flicker and thus the associated flicker indicator I2 are determined on the basis of observatio...

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Abstract

The invention relates to a method and a device for determining an image quality of an image sequence comprising several images, wherein the images are reconstructed from a data stream encoded by a predictive encoding process, and a respective flicker indicator is determined for an image range of the respective images of the image sequence, wherein the respective flicker indicator displays by means of two states whether flickering occurs or not in the image range of the respective image, an overall flicker indicator being generated such that the overall flicker indicator corresponds to that number of flicker indicators which display flickering, and the image quality being generated by division of the overall flicker indicator by a number of specific flicker indicators.

Description

technical field [0001] The invention relates to a method and a device for determining the image quality of an image sequence having a plurality of images, the images being reconstructed from a data stream encoded by a predictive coding method. Background technique [0002] Applications such as people monitoring in city centers or the use of compressed images in video telephony have grown over the past few years. It is known here that when image data and video data are highly compressed, a significant loss in image quality has to be accepted. A widely known quality measure for evaluating image data and video data is the PSNR method (PSNR-Peak Signal-to-Noise-Ratio, peak signal-to-noise ratio). Here, differences of corresponding pixels of the image before encoding and the image reconstructed based on encoding and decoding are accumulated, and the accumulated value is expressed as a logarithmic value. In this case, however, the pixels of the image data must be available befor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N7/26H04N17/00
CPCH04N19/002H04N19/00909H04N19/00218H04N19/159H04N19/154H04N19/86
Inventor J·潘德尔
Owner SIEMENS AG