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Quantization noise reduction method and related equipment

A noise and equipment technology, applied in the field of reducing quantization noise and corresponding equipment, can solve the problems of PDP image quality, large-scale compensation, and loss of definition, etc.

Inactive Publication Date: 2008-07-23
INTERDIGITAL CE PATENT HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] This PWM causes one PDP picture quality problem: the overall noise level, especially in the darker areas of the picture
[0005] The method (PWM) used to reproduce the video level on the plasma leads to a kind of PDP picture quality problem: the large quantization compensation, especially in the dark areas of the picture, strongly increases the noise level in these areas
However, standard noise reduction algorithms also have drawbacks such as loss of sharpness, motion artifacts (smearing after hard edges) etc.

Method used

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  • Quantization noise reduction method and related equipment
  • Quantization noise reduction method and related equipment
  • Quantization noise reduction method and related equipment

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Embodiment Construction

[0040] In order to better understand the concept of the present invention, two classes of standard noise reduction algorithms are now shown as preferred embodiments.

[0041] low pass filter

[0042] Analysis will be limited to a 2-dimensional low-pass filter based on 3 pixels and three rows. Clearly, such filters can be extended in spatial dimensions (more or fewer pixels, more or fewer rows) as well as in time direction by applying recursion (requires frame memory).

[0043] In the following, three known standard types of low-pass filters (3x3) are shown:

[0044] 1 9 1 1 1 1 1 1 1 1 1 ...

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Abstract

A plasma display panel is a pure linear display and does not provide a nonlinear gamma behaviour like a CRT so that an artificial gamma function has to be applied to the signal in digital form. This gamma function increases the quantization steps in the dark areas whereas the quantization steps will be reduced in the luminous areas. The basic idea is to apply an adaptive noise filtering after the gammatization process. The adaptive filtering is a specific filtering which is adapted to the gammatization quantization noise. In other words, the filtering will be maximum for dark areas and its efficacy will be automatically decreased when the luminance of the area is increasing.

Description

technical field [0001] The invention relates to a method and a device for reducing noise caused by quantization during signal processing of a digital display device, wherein a noise-charged signal is digitally filtered with a digital filter having a plurality of filter coefficients. Background technique [0002] A PDP, which stands for a plasma display panel, utilizes a matrix array of discharge cells that can only be "on" or "off." Therefore, it can be defined as a purely digital display. Also, unlike a CRT (cathode ray tube) or LCD (liquid crystal display) in which gray levels are expressed by analog control of light emission, a PDP controls gray levels by modulating the number of light pulses (hold pulses) per frame. flat. This temporal modulation will be integrated by the eye over a period of time corresponding to the temporal response of the eye. Since amplitude video is described by the number of light pulses occurring at a given frequency, more amplitude means more...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/28G06T5/00G06T5/20G09G3/20H04N5/21H04N5/66
CPCG09G3/2051G09G3/28G09G2320/0276G09G3/2022G09G3/288G09G3/291G09G3/296
Inventor 塞巴斯蒂安·魏特布吕克赖纳·茨温卡洛斯·科雷亚
Owner INTERDIGITAL CE PATENT HLDG