KR101290409B1 - Three mode improving method to obtain high-definition digital images - Google Patents

Abstract

PURPOSE: A 3-mode feedback method for obtaining a high definition digital image is provided to effectively remove digitizing and white noise and to improve image quality lost by a shaking phenomenon during frame and line scanning. CONSTITUTION: A 3-mode feedback apparatus filters a digital image signal inputted by a digital comb filter1 (DCF1), performs shaking, depressing dynamic 2K (Right-Left edges) (dD2K) and gamma correction, and synchronizes a corrected signal. The 3-mode feedback apparatus stores a synchronized signal in each of a graphic memory1 (GM1) and a graphic memory2 (GM2), filters a signal stored in the GM2 by a digital comb filter2 (DCF2), filters an inputted signal from a graphic memory3 (GM3) which stores the signal filtered by the GM1 and the DCF2 by a digital comb filter3 (DCF3) and synchronizes the signal filtered by the DCF3. The 3-mode feedback apparatus mixes and outputs synchronized signals.

Description

Three-mode feedback method for obtaining high-quality digital images {Three mode improving method to obtain high-definition digital images}

The present invention effectively removes digitizing and white noise, improves the image quality lost due to the rise of the frame / line scanning, as well as improves the color signal that is less three-dimensional in 2D / 3D conversion. The present invention relates to a three-mode feedback method for obtaining high quality digital images.

When digital video is decoded or converted into 2D / 3D video, a floating phenomenon occurs during scanning of video frames and lines, blurring of focus at the brightest part of the video signal, and digitizing noise. And color gamma signals are white balance.

Korean Patent No. 468164 (Registration Date: 2005.1.17., Name of the Invention: Image Signal Correction Apparatus) proposed as one way to solve this problem, as shown in Figures 1 and 2, the luminance signal, First, second, and third retarders for outputting an amplified signal by inputting the first color difference signal and the second color difference signal, respectively; And a reference value for the luminance signal, the first color difference signal, and the second color difference signal, and comparing the reference value with the outputs of the first to third decelerators, respectively, and comparing the difference value to the first value. And a level comparator which feeds back to the third to third retarder and controls the amplification degree of the first to third retarders.

In addition, Korean Patent No. 509127 (Registration Date: Aug. 10, 2005, Title of Invention: Contrast Sharpening Method and Image Processing Apparatus for Input Digital Images) sharpens the contrast of an input digital image including an array of pixel values. A method comprising: extracting a low frequency digital image comprising an array of pixel values from the input digital image, extracting a high frequency digital image comprising an array of pixel values from the input digital image, Determining a difference value between adjacent pixels along each column, summing the difference values to determine a contrast measurement for the input digital image, the low frequency digital image gain to high frequency digital image gain ratio Adjusting as a function of the measurement, and the low frequency It has been proposed for each of the pixel values in the digital image corresponding to a process comprising the step of combining the pixel values in the high frequency digital image.

However, these prior arts are limited to brightness, chrominance, and contrast, and have a problem in that the image quality of the entire digital image cannot be improved.

An object of the present invention, which was created to solve the above problems, effectively removes digitizing and white noise, improves image quality lost due to rise in frame / line scanning, as well as a color signal in which stereoscopic effect is reduced during 2D / 3D conversion. An object of the present invention is to provide a three-mode feedback method for obtaining a high-quality digital image that can be improved.

The object of the present invention comprises a first step of receiving a digital video signal and filtering by a first digital comb filter; A second step of synchronizing after the filtered signal is shaken, dD2K, and gamma corrected by a first compensator; The signals of the first stage are respectively stored in the first and second graphics memories, and the signals stored in the second graphics memory are received and filtered by a second digital comb filter. The first graphics memory and the second digital signals are filtered. A third step of filtering each signal received from the third graphic memory storing the signal filtered by the comb filter by the third digital comb filter and then synchronizing only the signal filtered by the third digital comb filter; It can be achieved by a three-mode feedback method for obtaining a high-quality digital image consisting of a fourth step of mixing and outputting the synchronized signal of the second step and the third step.

In detail, the present invention may further include inputting the corrected signal of the second stage into the second and third digital comb filters.

In detail, the present invention may further include shaking, dD2K and gamma correction of the synchronized signal of the third step by the second compensator.

Specifically, the present invention may further include the step of mixing the synchronized signal of the third step after synchronizing the filtering signal by the second digital comb filter.

As described above, the method of the present invention effectively removes digitizing and white noise, improves the image quality lost due to the floating phenomenon during frame / line scanning, as well as a color having a low three-dimensional effect during 2D / 3D conversion. There is an effect that can improve the signal.

1 and 2 is a block conceptual diagram according to the prior art.
3 is a block diagram illustrating a photovoltaic sub system according to another embodiment of the prior art.
Figure 4 is a block diagram showing a three-mode feedback device for obtaining a high-quality digital image according to the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Referring to FIG. 4, the three-mode feedback device 100 for obtaining a high quality digital image according to the present invention includes a plurality of digital comb filters (DCF1, DCF2, DCF3) and a plurality of correction units CRC1, CRC2. , CRC3), a plurality of graphic memories GM1, GM2, GM3, and a plurality of synchronization units SYN1, SYN2, SYN3, SYN4.

Here, the three-mode feedback device 100 for obtaining a high-quality digital image according to the present invention may be composed of one board or one chip, but is not limited thereto and may be manufactured by separating or merging into various systems in advance. Reveal.

The first digital comb filter DCF1 is a filter that improves luminance / chrominance separation used to reduce cross color interference and color noise to reproduce clear and detailed images. Here, the first digital comb filter DCF1 according to the present invention receives a digitizing and a modulated signal.

The first compensator CRC1 is a circuit that compensates for the signal filtered by the first digital comb filter DCF1. Here, the first compensator CRC1 includes an anti-shake circuit, a dD2K correction circuit, a noise reduction circuit, and a gamma correction circuit.

The first synchronizer SYN1 synchronizes the signal compensated by the first compensator.

The second graphic memory GM2 temporarily stores the signal filtered by the first digital comb filter DCF1. Here, the second graphics memory GM2 is E2PROM.

The second digital comb filter DCF2 receives and filters a signal stored in the second graphic memory.

The third graphic memory GM3 temporarily stores the signal filtered by the second digital comb filter DCF2, and the third digital comb filter DCF3 receives and filters the signal stored in the third graphic memory.

The second synchronizer SYN2 synchronizes the signal filtered by the third digital comb filter DCF3, and the second mixer M2 receives the signals input from the first and second synchronizers SYN1 and SYN2, respectively. Mix

The first graphics memory GM1 temporarily stores the signal filtered by the first digital comb filter DCF1, and the third digital comb filter DCF3 receives the signals stored in the first and third graphics memories. To filter.

In addition, the second synchronizer SYN2 synchronizes the signal filtered by the second digital comb filter DCF2, and the first mixer M1 is synchronized by the second and third synchronizers SYN2 and SYN3. Mix the signals.

Subsequently, the second compensator CRC2 receives and compensates the mixed signal by the first mixer M1, and the fourth synchronizer SYN4 synchronizes the signal compensated by the second compensator CRC2. do.

In addition, the second compensator CRC2 includes an anti-shake circuit, a dD2K correction circuit, a noise reduction circuit, and a gamma correction circuit.

Here, dD2K (Depressing Dynamic 2K (Right-Left edges)) noise is one of the general noise forms derived from EPEG4. More specifically, dD2K noise is mainly generated when decoding a compressed digitizing video signal, and is a kind of noise generated when processing both edges of a signal when compressing a video signal.

In particular, dD2K noise is generated in a dynamic image and relatively degrades the quality of a fast video. White noise also affects the temperature of the semiconductor and affects the reliability of the chip.

An operation relationship of the three-mode feedback device for obtaining a high quality digital image having the above configuration will be described.

Here, the method is limited to only one embodiment, but it is noted that there are various operating methods using the apparatus of the present invention, and that the bypass can be bypassed as necessary.

A first step of receiving a digital video signal and filtering the first digital comb filter; A second step of synchronizing after the filtered signal is corrected by the first compensator; Only the signals filtered by the third digital comb filter after filtering the signals received from the third graphics memory storing the signals filtered by the first graphics memory and the second digital comb filter by the third digital comb filter. A third step of synchronizing; And a fourth step of mixing and outputting the synchronized signals of the second and third steps.

First, the corrected signal of the second stage may be input to the second and third digital comb filters, and then the above-described steps may be performed.

Then, the synchronized signal of the third stage may be corrected by the second compensation unit and then mixed with the synchronized signal of the second stage.

The method may further include synchronizing the filtering signal by the second digital comb filter and mixing the synchronized signal with the third step.

The present invention as described above has been described with reference to one embodiment, but not limited to this, all embodiments modified based on the technical idea of the present invention are obviously belong to the scope of the present invention.

Claims (4)

A first step of receiving a digital video signal and filtering the first digital comb filter;
A second step of synchronizing after the filtered signal is shaken, dD2K, and gamma corrected by a first compensator;
The signals of the first stage are respectively stored in the first and second graphics memories, and the signals stored in the second graphics memory are received and filtered by a second digital comb filter. The first graphics memory and the second digital signals are filtered. A third step of filtering each signal received from the third graphic memory storing the signal filtered by the comb filter by the third digital comb filter and then synchronizing only the signal filtered by the third digital comb filter;
And a fourth step of mixing and outputting the synchronized signals of the second step and the third step.
The method of claim 1,
And inputting the corrected signal of the second stage into the second and the third digital comb filters.
delete The method of claim 1,
And synchronizing a filtering signal by the second digital comb filter and then mixing with the synchronized signal of the third step.

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