Region intercepting circuit for digital video image

A digital video and image technology, applied in the field of display manufacturing, can solve the problems of format limitation, poor portability and high cost, and achieve the effect of solving format mismatch, convenient adjustment and accurate timing

Inactive Publication Date: 2004-04-07
厦门火炬福大显示技术有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The circuit needs to use AV9173, AL422, MAX314 and other chips, and the cost is relatively high
[0004] The above circuit has many functions, but it is too complicated for image capture itself, and the format that can be changed is relatively limited, and its portability is poor, so it cannot be directly applied to other circuits.

Method used

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  • Region intercepting circuit for digital video image
  • Region intercepting circuit for digital video image
  • Region intercepting circuit for digital video image

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Embodiment Construction

[0019] Such as Figure 1 to Figure 4 As shown, the present invention is mainly composed of an address control unit, an address generation unit and a data storage unit. It can be applied to the interception of currently popular PAL, NTSC, and SECAM video images, and can also be used for composite video, S-Video, and D1 (digital) video formats. Now take the 320×240 format cut out from the PAL system image as an example to describe the implementation details of the present invention. For interception in other formats and in different regions, personnel in this industry can learn from it.

[0020] In order to realize the mapping of image data on the physical buffer address more accurately, this embodiment first intercepts the video image into a 512×256 format, and then further intercepts it into a required 320×240 format through a subsequent interface circuit.

[0021] 1. The data storage unit is used to store the digital video signal after the interception, adopts random access...

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Abstract

The region intercepting circuit for digital video image consists of data memory unit, address generating unit, address control unit and other parts. The data memory unit stores the digital video signal of the required part and outputs images of the intercepted region, and in controlled by address control unit controlled address generating unit. The present invention has the advantages of correct timing, convenient regulation and low cost owing to that EPROM is used in generating intercepting control signal. The present invention has also the advantages of faster response speed than software method and this results in real-time property and clear and vivid dynamic image effect. Compared with other hardware method, the present invention has cheap common elements and devices used and simple and clear circuit. The present invention may be used widely in display circuit of various formats and sizes.

Description

technical field [0001] The invention belongs to the technical field of display manufacture, and in particular relates to an area interception circuit of a digital video image of a field emission display device. Background technique [0002] In the process of processing the video source (external AV or DVD, etc.) into the final display target image (VGA or TV, etc.), if the format is not selected correctly, it is very easy to affect the effect. However, different displays require different display formats, or only a certain part needs to be displayed for each frame of image, so it is necessary to perform area interception on the video image. At present, the image interception is generally realized by image processing software. Software methods are convenient and easy to control, but they require additional equipment support, large size, high price, and require proprietary software and computer knowledge, so the application is more complicated. Moreover, the sampling speed o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11C16/06H04N5/44H04N5/76H04N5/93H04N7/01
Inventor 郭太良林志贤廖志君
Owner 厦门火炬福大显示技术有限公司
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