CN111082809A - Touch data transmission method and system - Google Patents
Touch data transmission method and system Download PDFInfo
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- CN111082809A CN111082809A CN201911083336.8A CN201911083336A CN111082809A CN 111082809 A CN111082809 A CN 111082809A CN 201911083336 A CN201911083336 A CN 201911083336A CN 111082809 A CN111082809 A CN 111082809A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M7/00—Conversion of a code where information is represented by a given sequence or number of digits to a code where the same, similar or subset of information is represented by a different sequence or number of digits
- H03M7/30—Compression; Expansion; Suppression of unnecessary data, e.g. redundancy reduction
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
- G06F17/10—Complex mathematical operations
- G06F17/14—Fourier, Walsh or analogous domain transformations, e.g. Laplace, Hilbert, Karhunen-Loeve, transforms
- G06F17/148—Wavelet transforms
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/04—Protocols for data compression, e.g. ROHC
Abstract
The invention discloses a touch data transmission method and a touch data transmission system, wherein the method comprises the steps of obtaining touch data, and compressing the touch data to obtain compressed touch data; and transmitting the compressed touch data to a host. The method improves the transmission efficiency of the touch data.
Description
Technical Field
The present invention relates to the field of touch technologies, and in particular, to a method and a system for transmitting touch data.
Background
Currently, after the touch data scanning is finished, all touch data are uploaded to the host from the IC. The scanned touch data is shown in fig. 1, each number in fig. 1 represents one touch data, all the whole touch data are sparse, the shaded parts in the figure represent data which are relatively concentrated, all the touch data are uploaded, the data volume is large, the time consumption for uploading the data is long, the influence on the point reporting rate is caused, and the transmission efficiency of the whole touch data is low. Therefore, how to improve the transmission efficiency of the touch data is an urgent problem to be solved.
Disclosure of Invention
The invention aims to provide a method and a system for transmitting touch data, so as to improve the transmission efficiency of the touch data.
To solve the above technical problem, the present invention provides a method for transmitting touch data, including:
acquiring touch data, and compressing the touch data to obtain compressed touch data;
and transmitting the compressed touch data to a host.
Preferably, the compressing the touch data to obtain the compressed touch data includes:
performing discrete wavelet transformation on the touch data to obtain touch data after the discrete wavelet transformation;
and compressing the touch data subjected to the discrete wavelet transform by adopting a data compression mode to obtain the compressed touch data.
Preferably, the performing discrete wavelet transform on the touch data to obtain touch data after discrete wavelet transform includes:
establishing a matrix corresponding to the touch data according to the scanning result of the touch data;
filling a frame of the matrix, so that the number of rows and the number of columns of the matrix are multiples of N, N is a natural number, and N is more than or equal to 1;
normalizing each element in the matrix to obtain a normalized matrix;
dividing the normalized matrix into a plurality of N × N order matrixes;
and for each NxN order matrix, carrying out discrete cosine transformation on the NxN order matrix to obtain a matrix after discrete cosine transformation.
Preferably, after the discrete cosine transforming the N × N order matrix to obtain the matrix after the discrete cosine transformation, the method further includes:
and setting a quantization matrix according to the density of the touch screen sensor, and rounding the matrix after discrete cosine transformation by using the quantization matrix to obtain a rounded matrix and storing the rounded matrix.
Preferably, the method further comprises:
decompressing the compressed touch data on the host to obtain the original touch data.
Preferably, the decompressing the compressed touch data on the host to obtain the original touch data includes:
and decompressing the compressed touch data on the host by adopting a data decompression mode, and performing discrete wavelet inverse transformation on the decompressed touch data to obtain original touch data.
The invention also provides a touch data transmission system for realizing the method, which comprises the following steps:
the compression module is used for acquiring touch data and compressing the touch data to obtain compressed touch data;
and the transmission module is used for transmitting the compressed touch data to the host.
Preferably, the compression module comprises:
the discrete wavelet transform module is used for performing discrete wavelet transform on the touch data to obtain the touch data after the discrete wavelet transform;
and the compression module is used for compressing the touch data after the discrete wavelet transform by adopting a data compression mode to obtain the compressed touch data.
Preferably, the discrete wavelet transform module includes:
the matrix establishing unit is used for establishing a matrix corresponding to the touch data according to the scanning result of the touch data;
the filling unit is used for filling the frame of the matrix, so that the number of rows and columns of the matrix is a multiple of N, N is a natural number, and N is more than or equal to 1;
the normalization unit is used for performing normalization processing on each element in the matrix to obtain a normalized matrix;
a dividing unit for dividing the normalized matrix into a plurality of N × N order matrixes;
and the matrix transformation unit is used for performing discrete cosine transformation on each NxN order matrix to obtain a matrix after discrete cosine transformation.
Preferably, the discrete wavelet transform module further comprises: and the rounding unit is used for setting a quantization matrix according to the density of the touch screen sensor, and rounding the matrix after discrete cosine transformation by using the quantization matrix to obtain a rounded matrix and storing the rounded matrix.
Preferably, the system further comprises:
and the decompression module is used for decompressing the compressed touch data on the host to obtain the original touch data.
Preferably, the decompression module is specifically configured to decompress the compressed touch data on the host computer in a data decompression manner, and perform inverse discrete wavelet transform on the decompressed touch data to obtain the original touch data.
The invention provides a touch data transmission method and system, which are used for acquiring touch data, compressing the touch data to obtain compressed touch data; and transmitting the compressed touch data to a host. Therefore, before the touch data are transmitted, the touch data are compressed to obtain the compressed touch data, then the compressed touch data are transmitted to the host, and the compressed data are transmitted.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic view illustrating a part of touch data scanned in the prior art;
fig. 2 is a flowchart of a touch data transmission method according to the present invention;
FIG. 3 is a schematic diagram illustrating a touch data transmission process;
fig. 4 is a schematic structural diagram of a touch data transmission system according to the present invention.
Detailed Description
The core of the invention is to provide a method and a system for transmitting touch data so as to improve the transmission efficiency of the touch data.
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 2, fig. 2 is a flowchart of a touch data transmission method provided in the present invention, the method includes the following steps:
s11: acquiring touch data, and compressing the touch data to obtain compressed touch data;
s12: and transmitting the compressed touch data to a host.
Therefore, in the method, the touch data are compressed before being transmitted to obtain the compressed touch data, then the touch data are transmitted, and when the touch data are transmitted to the host, the host decompresses the touch data to obtain the original touch data, so that the compressed data are transmitted, and the data are compressed, so that the transmission efficiency is improved.
Wherein the execution subject of step S11 and step S12 is an IC chip.
Based on the above method, further, in step S11, the process of compressing the touch data to obtain compressed touch data specifically includes the following steps:
s22: performing discrete wavelet transformation on the touch data to obtain touch data after the discrete wavelet transformation;
s23: and compressing the touch data subjected to the discrete wavelet transform by adopting a data compression mode to obtain the compressed touch data.
The data compression mode comprises Huffman coding, and other data compression modes are also applicable to the invention except the data compression mode of the Huffman coding.
In detail, the process of step S22 specifically includes the following steps:
s31: establishing a matrix corresponding to the touch data according to the scanning result of the touch data;
the matrix represents touch data, and each element in the matrix represents a numerical value of the touch data;
s32: filling a frame of the matrix, so that the number of rows and the number of columns of the matrix are multiples of N, N is a natural number, and N is more than or equal to 1;
performing frame filling on the matrix is to perform frame filling on the touch data, so that rows and columns of the touch data can be evenly divided by N, optionally, N is 8, rows and columns of the touch data can be evenly divided by 8, and a value of 0 is used for performing frame filling;
s33: normalizing each element in the matrix to obtain a normalized matrix;
each element in the matrix is touch data, normalization processing is carried out on the touch data, normalization is carried out to the range of-128-127, and the normalization coefficient is M;
s34: dividing the normalized matrix into a plurality of N × N order matrixes;
the touch data is divided into a plurality of 8 by 8 blocks;
s35: and for each NxN order matrix, carrying out discrete cosine transformation on the NxN order matrix to obtain a matrix after discrete cosine transformation.
The discrete cosine transform is performed on each piece of normalized touch data, and the formula for performing the discrete cosine transform on the NxN order matrix is as follows: b is UAUTA is an N × N matrix, that is, the normalized touch data of each block is represented, B is a matrix after discrete cosine change, U is a discrete cosine change parameter, and specifically, the value of U is:
further, after step S35, the method further includes: and setting a quantization matrix according to the density of the touch screen sensor, and rounding the matrix after discrete cosine transformation by using the quantization matrix to obtain a rounded matrix and storing the rounded matrix.
Different Sensor densities cause different amounts of high-frequency signal components of touch data when fingers touch, and different quantization matrixes need to be designed; the formula for rounding the matrix after discrete cosine transform by using the quantization matrix is as follows: c is round (B/Q), the round function is a rounding function, B is a matrix after discrete cosine transform, Q is a quantization matrix, and C is a rounded matrix, and the rounding after division is calculated by using the formula.
Further, the method comprises the following steps:
s13: decompressing the compressed touch data on the host to obtain the original touch data.
In step S13, a data decompression method is specifically adopted to decompress the compressed touch data on the host, and perform inverse discrete wavelet transform on the decompressed touch data, so as to obtain original touch data. The executor of step S13 is a host.
Specifically, in step S23, C is compressed and stored, and C is compressed by a data compression method such as huffman coding, and the compressed data is denoted as D, and the data compression method is freely set. Then the IC chip transmits the data D and the normalization coefficient M to a host; and the host decompresses the data D, adopts Huffman decoding, and performs inverse discrete cosine transform to recover the data after the data scale is recovered. Touch data generally has strong sparsity and can be transmitted after data compression.
Based on the method, in detail, before the IC chip scans the touch data, decompression standards of the compressed data are sent to the host, and the decompression standards comprise quantization matrixes and decoding modes. Referring to fig. 3, fig. 3 is a schematic diagram illustrating a touch data transmission process, after touch data is scanned, the touch data is compressed, the compressed data is transmitted from the IC to the host, and the host decompresses the data to recover the touch data, thereby completing one communication.
For example, taking 16 × 32 touch screen Sensor arrangement and huffman coding compression as an example, the space occupied by uncompressed touch Data is 1024 bytes, the space occupied by compressed touch Data is 80-350 bytes, and the compression ratio depends on the touch area and noise condition of the frame of touch Data.
Referring to fig. 4, fig. 4 is a schematic structure of a touch data transmission system provided in the present invention, the system includes:
the compression module 101 is configured to obtain touch data, and compress the touch data to obtain compressed touch data;
the transmission module 102 is configured to transmit the compressed touch data to a host.
Therefore, the system compresses the touch data before transmitting the touch data to obtain the compressed touch data, then transmits the touch data, and decompresses the touch data to obtain the original touch data when transmitting the original touch data to the host, so that the compressed data is transmitted, and the transmission efficiency is improved because the data is compressed.
Wherein the compression module and the transmission module are disposed on the IC chip.
Further, the compression module includes:
the discrete wavelet transform module is used for performing discrete wavelet transform on the touch data to obtain the touch data after the discrete wavelet transform;
and the compression module is used for compressing the touch data after the discrete wavelet transform by adopting a data compression mode to obtain the compressed touch data.
Further, the discrete wavelet transform module comprises:
the matrix establishing unit is used for establishing a matrix corresponding to the touch data according to the scanning result of the touch data;
the filling unit is used for filling the frame of the matrix, so that the number of rows and columns of the matrix is a multiple of N, N is a natural number, and N is more than or equal to 1;
the normalization unit is used for performing normalization processing on each element in the matrix to obtain a normalized matrix;
a dividing unit for dividing the normalized matrix into a plurality of N × N order matrixes;
and the matrix transformation unit is used for performing discrete cosine transformation on each NxN order matrix to obtain a matrix after discrete cosine transformation.
Further, the discrete wavelet transform module further comprises: and the rounding unit is used for setting a quantization matrix according to the density of the touch screen sensor, and rounding the matrix after discrete cosine transformation by using the quantization matrix to obtain a rounded matrix and storing the rounded matrix.
Further, the system further comprises:
and the decompression module is used for decompressing the compressed touch data on the host to obtain the original touch data.
The decompression module is specifically used for decompressing the compressed touch data on the host by adopting a data decompression mode and performing inverse discrete wavelet transform on the decompressed touch data to obtain original touch data.
Wherein, the decompression module is arranged on the host.
The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same or similar parts among the embodiments are referred to each other. For the system disclosed by the embodiment, the description is relatively simple because the system corresponds to the method disclosed by the embodiment, and the relevant points can be referred to the method part for description.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The touch data transmission method and system provided by the invention are described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (12)
1. A touch data transmission method is characterized by comprising the following steps:
acquiring touch data, and compressing the touch data to obtain compressed touch data;
and transmitting the compressed touch data to a host.
2. The method of claim 1, wherein compressing the touch data to obtain compressed touch data comprises:
performing discrete wavelet transformation on the touch data to obtain touch data after the discrete wavelet transformation;
and compressing the touch data subjected to the discrete wavelet transform by adopting a data compression mode to obtain the compressed touch data.
3. The method of claim 2, wherein the performing discrete wavelet transform on the touch data to obtain touch data after discrete wavelet transform comprises:
establishing a matrix corresponding to the touch data according to the scanning result of the touch data;
filling a frame of the matrix, so that the number of rows and the number of columns of the matrix are multiples of N, N is a natural number, and N is more than or equal to 1;
normalizing each element in the matrix to obtain a normalized matrix;
dividing the normalized matrix into a plurality of N × N order matrixes;
and for each NxN order matrix, carrying out discrete cosine transformation on the NxN order matrix to obtain a matrix after discrete cosine transformation.
4. The method of claim 3, wherein said discrete cosine transforming said NxN matrices for each NxN matrix to obtain a discrete cosine transformed matrix further comprises:
and setting a quantization matrix according to the density of the touch screen sensor, and rounding the matrix after discrete cosine transformation by using the quantization matrix to obtain a rounded matrix and storing the rounded matrix.
5. The method of claim 1, further comprising:
decompressing the compressed touch data on the host to obtain the original touch data.
6. The method of claim 5, wherein decompressing the compressed touch data on the host to obtain the original touch data comprises:
and decompressing the compressed touch data on the host by adopting a data decompression mode, and performing discrete wavelet inverse transformation on the decompressed touch data to obtain original touch data.
7. Touch data transmission system for implementing the method according to any one of claims 1 to 6, comprising:
the compression module is used for acquiring touch data and compressing the touch data to obtain compressed touch data;
and the transmission module is used for transmitting the compressed touch data to the host.
8. The system of claim 7, wherein the compression module comprises:
the discrete wavelet transform module is used for performing discrete wavelet transform on the touch data to obtain the touch data after the discrete wavelet transform;
and the compression module is used for compressing the touch data after the discrete wavelet transform by adopting a data compression mode to obtain the compressed touch data.
9. The system of claim 8, wherein the discrete wavelet transform module comprises:
the matrix establishing unit is used for establishing a matrix corresponding to the touch data according to the scanning result of the touch data;
the filling unit is used for filling the frame of the matrix, so that the number of rows and columns of the matrix is a multiple of N, N is a natural number, and N is more than or equal to 1;
the normalization unit is used for performing normalization processing on each element in the matrix to obtain a normalized matrix;
a dividing unit for dividing the normalized matrix into a plurality of N × N order matrixes;
and the matrix transformation unit is used for performing discrete cosine transformation on each NxN order matrix to obtain a matrix after discrete cosine transformation.
10. The system of claim 9, wherein the discrete wavelet transform module further comprises: and the rounding unit is used for setting a quantization matrix according to the density of the touch screen sensor, and rounding the matrix after discrete cosine transformation by using the quantization matrix to obtain a rounded matrix and storing the rounded matrix.
11. The system of claim 7, further comprising:
and the decompression module is used for decompressing the compressed touch data on the host to obtain the original touch data.
12. The system of claim 11, wherein the decompression module is specifically configured to decompress the compressed touch data on the host by using a data decompression method, and perform inverse discrete wavelet transform on the decompressed touch data to obtain the original touch data.
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