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Filter and method for eliminating image error and related display circuit

A filter and error technology, applied in the field of display circuits, can solve the problems of increasing hardware cost and increasing signal processing time, and achieve the effect of eliminating error value and saving hardware cost and signal processing time.

Active Publication Date: 2012-06-27
MEDIATEK INC
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

exist figure 2 In the existing architecture of the present invention, the error value of the aforementioned PAL television signal is eliminated by the video decoder 21, so at least one or two scanning line buffers (line buffer) must be set in the video decoder 21 for temporary storage. The scan lines in the image field are used to eliminate the error value, which not only increases the hardware cost, but also increases the signal processing time

Method used

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  • Filter and method for eliminating image error and related display circuit
  • Filter and method for eliminating image error and related display circuit
  • Filter and method for eliminating image error and related display circuit

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Embodiment Construction

[0028] The embodiments of the present invention described below can be used for chrominance signals in PAL television signals or any image signals with similar error characteristics, that is, image signals with regular errors similar to those shown in Figure 1 (b). While performing image vertical scaling, the error value contained in the signal is eliminated. In other words, in figure 2 In the image processing framework of the present invention, the prior art is to eliminate the error value in the video decoder 21, so it is necessary to add a scan line buffer to temporarily store the scan line, and additional processing time is required to eliminate the error value; and the present invention Then, the error value can be eliminated when performing the vertical scaling of the image in the scaler 23, and since the scaler 23 itself has a scan line buffer, it is not necessary to add a new scan line buffer, which can save hardware at the same time cost and signal processing time. ...

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Abstract

The invention discloses a filter and a method for eliminating an image error and a related display circuit, which can eliminate all the error values of an image signal so as to save the cost of hardware and signal process time. The filter comprises a plurality of multipliers and an adder, wherein the multipliers receive a plurality of pixel values from a plurality of scanning lines and output thepixel values after multiplying each pixel value by the corresponding weighting coefficient; the adder is used for adding the total output of the multipliers to generate an output pixel value; and theerror value of each pixel value has a regularity and the corresponding weighting coefficient is relevant to the regularity, so that the error values can be cancelled when the adder generates the output pixel value.

Description

technical field [0001] The invention relates to image processing, in particular to a filter and method for eliminating image errors and related display circuits. Background technique [0002] In the TV standard PAL (Phase Alternating Line), when demodulating the chrominance signal in the TV signal, there will be a regular chroma phase error (chroma phase error), that is, in each field (field) In , the chromaticity value of each pixel of each scanning line contains an error value, and the error value is positive and negative alternately appearing between adjacent scanning lines, as shown in Figure 1(a), the field is represented by a lowercase f Indicates that f0~f3 represent four consecutive image fields, f0 and f2 are even field (even field), f1 and f3 are odd field (odd field), L0, L1, L2, etc. are the numbers of scanning lines , which represents the scan line in the frame. It can be seen from Fig. 1(a) that the even image field and the odd image field respectively contai...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/21H04N5/44H04N9/45
Inventor 任立寰郑昆楠
Owner MEDIATEK INC
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