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Image filtering processing method

A processing method and image filtering technology, which is applied in image data processing, image communication, graphics and image conversion, etc., can solve problems such as inability to use overlapping, and bandwidth consumption of read and write operations, so as to solve bandwidth bottlenecks, improve bandwidth efficiency, and save The effect of bandwidth

Inactive Publication Date: 2008-12-03
HAIER BEIJING IC DESIGN
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Problems solved by technology

However, in vertical filtering, the processing time of two vertically adjacent points is not similar, so the overlap cannot be used, and the data of the input point can only be temporarily stored for subsequent processing, and its read and write operations will consume a certain amount of bandwidth.

Method used

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Embodiment Construction

[0015] In order to improve the bandwidth efficiency of the external memory during image processing, the present invention provides a brand new image filtering method. Next, the image processing method will be described in detail by taking different input point sequences as examples.

[0016] First, let's understand how the image filtering method works. For example, if the input points are X1, X2, X3, X4 and the output points are Y1, Y2, the transformation formula is:

[0017] Y1=0.2X1+0.4X2+0.3X3+0.1X4,

[0018] Y2=0.1X1+0.3X2+0.4X3+0.2X4.

[0019] The traditional process of input calculation output is to read X1-X4 to calculate Y1 first, and then read X1-X4 to calculate Y2, which requires storing X1-X4. The method of calculating the impact of input on output is to first establish the impact of input on output. The impact factor of X1 on Y1 is 0.2, and the impact factor of X1 on Y2 is 0.1. At this time, Y1=Y1+0.2X1, Y2=Y2+ 0.1X1. At this point, the influence of X1 on the ...

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Abstract

The invention discloses an image filtering process method, which solves the problem of low bandwidth efficiency of an external memory during image scaling. The image filtering process method of the invention is characterized in that: the method comprises the steps: information of one input point is input; each output point affected by an input point is processed through calculating the effect of the input point on the output point; data of each processed output point is stored in a high-speed cache; all input points are processed in sequence according to the steps; when all input points that affect an output point are processed, the processed output point is output, or the processed output point data in the high-speed cache are written into a memorizer after all relevant input points are processed, and then all output points are integrated and output. The process method of the invention can save bandwidth of an external memory and improve bandwidth efficiency of the external memory.

Description

technical field [0001] The invention relates to an image filtering processing method. Background technique [0002] In multimedia applications, such as watching pictures or adjusting the size of videos, it is necessary to zoom in and out of images or videos in real time, and a large amount of data must be read and written to the storage device, which will occupy a large amount of bandwidth of the storage device. [0003] The traditional frequency domain image scaling method is to use digital filter to perform linear filter scaling. In general, the higher the order of the digital filter, the better the effect, but each output point requires more input points. For example, if a two-dimensional image uses a 3rd-order filter to obtain an output point, it needs 3*3 input points, while a 6th-order filter requires 6*6 points. For a 24-bit color system with a resolution of 800*600 and 30 frames per second, if 6-order filtering is used without any optimization, the bandwidth of 800...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/44H04N1/393G06T3/40
Inventor 史岩
Owner HAIER BEIJING IC DESIGN
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