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Compression and decompression method of handwritten terminal track

A compression method and trajectory technology, applied in the direction of electrical components, code conversion, etc., can solve the problem of fixed-length coding without considering the adjacentness, and achieve the effect of overcoming the large storage space

Inactive Publication Date: 2011-12-28
HANVON CORP
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Problems solved by technology

Furthermore, the adjacency between points is not considered in the fixed-length encoding

Method used

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  • Compression and decompression method of handwritten terminal track
  • Compression and decompression method of handwritten terminal track
  • Compression and decompression method of handwritten terminal track

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Embodiment Construction

[0033] The technical solutions of the present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0034] figure 1 It is a flow chart of an embodiment of the method for compressing the trajectory of the handwriting terminal in the present invention. Such as figure 1 As shown, the compression method of the handwriting terminal track in this implementation comprises:

[0035] S101. Calculate the coordinate difference between the actual coordinates of each track point and the predicted coordinates of the point.

[0036] When writing on the handwriting terminal, the sampling input of the device screen produces a series of intermittent points, and these points are connected in order of writing time to form each track. When saving the trajectory, the existing technology adopts to save the actual coordinates of each trajectory point that constitutes each trajectory, but there is a certain correlation between these poi...

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Abstract

The invention discloses a compression method and a decompression method of a handwritten terminal track, belonging to the field of image compression. The method for compressing the trajectory of the handwriting terminal includes: calculating the coordinate difference between the actual coordinates of each trajectory point and the predicted coordinates of the point; performing entropy encoding on the coordinate difference to obtain a code word to complete the compression of each trajectory. The decompression method of the trajectory of the handwriting terminal includes: performing entropy decoding on the saved codewords to obtain the coordinate difference between the actual coordinates of each trajectory point and the predicted coordinates of the point; obtaining the predicted coordinates of each trajectory point according to the predicted tap coefficient; The coordinate difference between the predicted coordinates and the actual coordinates of the point and the predicted coordinates of the point is used to obtain the actual coordinates of each track point. In the present invention, the correlation of the coordinates of the track points is utilized when compressing and encoding the track, which overcomes the disadvantage of large storage space caused by uniformly adopting fixed-length encoding to encode the track in the prior art.

Description

technical field [0001] The invention belongs to the field of image compression, and relates to a method for compressing a trajectory written on a handwriting terminal, in particular to a method for compressing a trajectory of a handwriting terminal that combines predictive coding and entropy coding. Background technique [0002] Handwriting recognition technology has been widely used in terminals such as mobile phones and electronic readers. Using these terminals that support handwriting technology, users can make annotations on documents they read, take notes and memos in sticky notes, and the resulting tracks need to be saved. Saving these trajectories as binary images is the most straightforward way. Since the trajectory is composed of a series of discontinuous points, in the prior art, binary images are used to save the trajectory to save the actual coordinate values ​​of all points, and a fixed-length encoding method is adopted. However, this saving method does not ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M7/30
Inventor 王晓楠郑士奇
Owner HANVON CORP
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