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Method for quickly zooming video image on handheld equipment

A technology for video images and handheld devices, applied in the field of video processing, can solve problems such as image effect decline and aliasing, and achieve the effect of reducing the amount of calculation and approximating the effect.

Active Publication Date: 2012-07-04
FUZHOU ROCKCHIP SEMICON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of bilinear scaling is that each point in the two-dimensional direction requires a total of 8 multiply-accumulate
However, for zoom factors other than 0.5 to 2, the image effect will drop significantly, and there will be obvious aliasing

Method used

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  • Method for quickly zooming video image on handheld equipment
  • Method for quickly zooming video image on handheld equipment
  • Method for quickly zooming video image on handheld equipment

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Experimental program
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Embodiment Construction

[0037] Please refer to image 3 to Figure 4b , to describe the method of the present invention in detail.

[0038] The present invention still uses the improved method of drawing straight lines to zoom, which includes zooming in the horizontal direction and zooming in the vertical direction. According to the analysis in the background technology, the video zoom factor on the handheld device is usually between 0.25 and 3 times. between. For this reason, the concept of 1 / 4 pixel is introduced in the method of the present invention. Wherein: the length of each pixel in the horizontal or vertical direction is equally divided into 4 equal divisions to form four equal division reference intervals, and each equal division reference interval has the coordinate values ​​of two endpoints (for each pixel, A total of coordinate values ​​of two endpoints, a coordinate value of an intermediate point that is a 1 / 2 pixel point, and two coordinate values ​​of a 1 / 4 pixel point are generate...

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Abstract

The invention provides a method for quickly zooming a video image on handheld equipment. In the method, horizontal zooming and vertical zooming are performed; the length of each pixel in the horizontal direction or vertical direction is uniformly partitioned into four equal parts to form four equal reference intervals; each equal reference interval has coordinate values of two end points; and an improved method for drawing straight lines is adopted for zooming. The method comprises the following steps of: drawing points in the horizontal direction and repeating the process of drawing points in the horizontal direction in the vertical direction; or drawing points in the vertical direction and repeating the process of drawing points in the vertical direction in the horizontal direction; andending drawing when all the points in the horizontal direction and the vertical direction reach a final point. By adopting the method for drawing straight lines, the operand can be effectively reduced, multiplication accumulating times are particularly reduced, and the zooming quality is remarkably better than the nearest domain zooming quality.

Description

【Technical field】 [0001] The invention relates to a video processing technology, in particular to a fast zooming method of a video image on a handheld device. 【Background technique】 [0002] At present, video playback on handheld consumer electronic devices is a very important function. Consumers require that various videos on the Internet can be downloaded to handheld devices for direct playback without conversion in advance. Common video formats on the Internet vary widely in resolution. From QVGA (320*240 pixels), to VGA (640*480 pixels), D1 (720*480 pixels), and then to 720P (1280*720 pixels), 1080P (1920*1080 pixels), which have been greatly increased in the past two years. All these videos with different resolutions must be played smoothly on the handheld device. In addition to requiring the handheld device to have high decoding performance and comprehensive decoding compatibility, it is also required to provide real-time scaling of video images without exception. Th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T3/40
Inventor 简欢
Owner FUZHOU ROCKCHIP SEMICON
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