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Image instantaneous improvement device

An image and pixel technology, applied in the field of image instantaneous improvement device, can solve problems such as block contours in gentle regions, aliasing in high frequency regions, image FRM distortion, etc., to meet design requirements and improve aliasing and block contour phenomena Effect

Inactive Publication Date: 2013-07-24
NOVATEK MICROELECTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, gain values ​​suitable for high-frequency regions are not suitable for low-frequency regions, and vice versa
For example, applying a high gain value suitable for sharpening edge areas to flat areas will cause blocky contours in flat areas, making the image FRM distorted due to discontinuities, such as image 3 shown
In addition, if a high gain value is applied to a complex and sharp high-frequency area, it will cause aliasing in the high-frequency area, such as Figure 4 shown

Method used

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Embodiment Construction

[0054] Please refer to Figure 5 , Figure 5 It is a schematic diagram of an image transient improvement device 50 according to an embodiment of the present invention. The image instantaneous improvement device 50 is used to improve the aliasing (aliasing) phenomenon in an image IMG, including an input end 500, an output end 512, an extremum detector 502, a filter 504, and a weighted second-order differential detection 520 , a multiplier 506 , an adder 508 and a limiter 510 . The input terminal 500 is used for receiving pixels P( 1 )˜P(N) of a sub-region IMG_sub in the image IMG. The output terminal 512 is used to output an instantaneous improved sub-region img_ti of the sub-region IMG_sub. The extremum detector 502 is used to detect a maximum gray scale value MAX and a minimum gray scale value MIN in the pixels P( 1 )˜P(N). The filter 504 is used to extract a frequency component img_f of pixels P( 1 )˜P(N) at a specific frequency. The weighted second-order differential d...

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Abstract

The invention discloses an image instantaneous improvement device for improving a jaggies phenomenon in an image. The device comprises an extreme value detector, a filter, a weighting second-order differential detector, a multiplier, an adder and a limiter, wherein the extreme value is used for detecting a maximum gray-scale value and a minimum gray-scale value of multiple pixels in a subdomain of the image; the filter is used for capturing a frequency component of multiple pixels under a specific frequency; the weighting second-order differential detector is used for calculating multiple second-order differential values of the multiple pixels and generating a gain value according to the multiple second-order differential values; the multiplier for multiplying the gain value by the frequency component to generate a gain frequency component; the adder is used for calculating summation of the multiple pixels and the gain frequency component to generate ah addition result; and the limiter is used for converting the addition result into an instantaneously improved subdomain according to the maximum gray-scale value and the minimum gray-scale value.

Description

technical field [0001] The invention relates to an image instant improvement device, in particular to an image instant improvement device used to improve the jagged phenomenon and the block outline phenomenon in the image. Background technique [0002] With the popularization of digital photography and playback equipment, the demand for digital element image processing technology in the industry and general consumers is gradually increasing. For example, image transient improvement (transient improvement) technology can be used to improve the defects of an image due to the deviation of photographic equipment and techniques, for example, by detecting the blurred area in an image, shortening the edge of the blurred area, and then obtaining visual sharper effect. [0003] Please refer to figure 1 , figure 1 It is a schematic diagram of a conventional image instant improvement device 10 . The image transient improvement device 10 includes an input terminal 100 , an extremum ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/21G06T5/00
Inventor 林裕贸郭志嘉
Owner NOVATEK MICROELECTRONICS CORP