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Source data acquisition and compression method for wireless projection

A technology of data acquisition and compression method, applied in image communication, digital video signal modification, digital output to display devices, etc. Projection screen smooth effect

Inactive Publication Date: 2013-08-14
陈日清
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the defect of j peg2000 is that the algorithm only compresses one picture, and in the process of projection, it needs to continuously capture the client screen image for compression. The previous frame and the next frame of a frame of image are likely to be similar, which means strong inter-frame correlation
If the jpeg2000 algorithm is used, the efficiency of image compression for each frame is obviously not high

Method used

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  • Source data acquisition and compression method for wireless projection
  • Source data acquisition and compression method for wireless projection
  • Source data acquisition and compression method for wireless projection

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Embodiment Construction

[0026] The present invention will be further elaborated below in conjunction with the accompanying drawings.

[0027] One embodiment of the present invention is a method for collecting and compressing information source data for wireless projection, and the method includes the following steps:

[0028] Step A, the client system sends out a drawing command, and the graphics card hardware driver and mirror driver receive the command at the same time; wherein the graphics card hardware driver performs the drawing operation after executing the command, and displays it on the monitor; the mirror driver makes a drawing operation in the unit memory area Drawing operations, and modify the data in the memory area of ​​the unit;

[0029] Step B, the client system saves the image data cached in the unit memory area in step A as a bitmap format according to the unit time interval, that is, the continuous image frame data of the screen image is obtained;

[0030] Step C, transmit the cont...

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Abstract

The invention discloses a source data acquisition and compression method for wireless projection, which belongs to the field of wireless projection. The method can quickly and efficiently capture and compress screen images, transmits the compressed screen images to a service terminal for display via a wireless network, and finally achieves the function of wireless projection. The scheme adopts screenshot based on mirror image driving and an optimization algorithm based on H.264. Compared with the traditional screenshot GDI and DirectX, the method has the advantages of low occupancy of CPU, high quality of images, high efficiency of screenshot and the like. Aiming to the characteristic of the large interframe relativity of the screen images, the video compression algorithm based on the H.264 is improved, and on the basis, layered codes based on ROI (Region of Interest) is introduced, and as a result, the data transmission capacity is lower and the quality is higher.

Description

technical field [0001] The present invention relates to a method for realizing wireless projection technology, and more specifically, the present invention mainly relates to a method for collecting and compressing information source data for wireless projection. Background technique [0002] In a projection system, the source is the screen image. Screen data collection technologies mainly include GDI screen capture and DirectX screen capture. The GDI screenshot mechanism is based on the simple common sense that "the desktop is also a window, and the desktop also has a window handle". If we get the device context (DC) of the desktop, we can use it to copy its content to the DC we created. . To get the handle of the window, the function GetDeskWindow() can be used. Similarly, DC can also be obtained through the handle HWnd. The specific implementation method is: 1. Obtain the desktop handle through the GetDesktopWindow() function; 2. Obtain the desktop DC with GetDC(); 3. ...

Claims

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Application Information

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IPC IPC(8): G06F3/14H04N7/32H04N7/26H04N19/31
Inventor 陈日清徐诚胥加旺
Owner 陈日清
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