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Image data transmitting and restoring method, device and terminal

A technology of image data and transmission method, applied in image communication, electrical components and other directions, can solve the problems of slow network transmission, small network bandwidth, slow transmission of PNG format pictures, etc., to reduce network traffic and time, and save size.

Inactive Publication Date: 2012-06-20
融创天下(上海)科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the field of mobile networks, portable devices are generally used, such as mobile phones, PDAs, etc., with weak image processing capabilities, small network bandwidth and slow network transmission.
This results in slower transmission of PNG format images in the mobile Internet field; therefore, a transmission method for PNG format images in the graphic image field with lower image requirements is currently required

Method used

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  • Image data transmitting and restoring method, device and terminal
  • Image data transmitting and restoring method, device and terminal
  • Image data transmitting and restoring method, device and terminal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] Example 1, see figure 1 , based on the above-mentioned map image cutting and color sampling, only the chunk block of IDAT is transmitted during transmission, the present invention provides a method for sending image data:

[0071] Step 101: Pre-cut the picture file so that each cut picture has the same IHDR and PLTE;

[0072] The "make each slice have the same IHDR and PLTE" mentioned in this step may be: slice all image data using the preset first palette.

[0073] The method to preset the first palette can be:

[0074] Step 1011: traverse all image data blocks, and obtain the color values ​​(RGB values) of all pixels in the image data blocks;

[0075] Step 1012: loop through all the color values, extract the color values ​​of the same color; store each extracted color value, and generate the first color palette.

[0076] The extraction of similar color values ​​described in this step can be: for example, when the color values ​​of one color are 48, 49, 50, 51, 52; ...

Embodiment 2

[0082] Example 2, see figure 2 , corresponding to the image data sending method provided in Embodiment 1, Embodiment 2 of the present invention provides an image data recovery method;

[0083] Step 201: receiving compressed image data;

[0084] Step 202: read and store the image data block IDAT through the compressed image data;

[0085] The method of reading IDAT in this step is to read data block (chunk) length (4 bytes), data block (chunk) type code (4 bytes), data block data (chunk Data ), CRC, composed of data blocks (chunk) and recorded to Hashtable as a buffer.

[0086] Step 203: Decompress the data block chunk; prepare for later generation of color index values. The implementation of the decompression process is a known general method, which will not be described in detail here.

[0087] Step 204: judge whether the first palette exists, if not, execute step 205; if exist, execute step 206;

[0088] Step 205: Generate a first palette;

[0089] The method for gene...

Embodiment 3

[0116] Embodiment 3, referring to Fig. 4, the embodiment of the present invention also provides a data recovery device, and the data recovery device includes:

[0117] The receiving unit is used to receive compressed image data; decompress the compressed image data to obtain decompressed image data blocks;

[0118] A processing unit, configured to determine whether the first palette exists; if not, generate the first palette through the image data block; if it exists, generate the second palette according to the first palette;

[0119] A recovery unit, configured to generate an index value list of the color of each image data block through the second palette; generate a picture file according to the index value list and the image data block;

[0120] The processing unit includes a first judging unit and a palette unit;

[0121] a first judging unit, configured to judge whether the first palette exists;

[0122] a palette unit, configured to generate a first palette through t...

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Abstract

The invention provides an image data transmitting method, which includes steps of cutting image data so that all cut images have identical header chunks and palette chunks, receiving image data transmitting commands, compressing the image data transmitting commands in correspondence to image data chunks of the cut images to form compressed image data, and transmitting compressed image data. The invention further provides a data restoring device, which comprises a receiving unit, a processing unit and a restoring unit. By using the image data transmitting method, size of png (portable network graphic) files can be reduced, and network flow and time are greatly reduced after IDAT (image data chunks) are integrated into the IHDR (header chunks) and the PLTE (palette chunks).

Description

technical field [0001] The invention relates to the field of image data transmission, in particular to a method for sending and restoring image data. Background technique [0002] Portable Network Graphics (PNG), referred to as PNG, is a lossless data compression bitmap graphics file format. The PNG format is lossless data compression, allows the use of palette technology similar to the GIF format, supports true color images, and has features such as alpha channels (translucency). Many people now use the PNG format on the Internet and elsewhere. Another theory is that the name comes from the unofficial "PNG is Not GIF", which is a recursive nomenclature imitating GNU. [0003] In the prior art, images in PNG format are often used on the Internet. Due to the limited bandwidth on the Internet, there is generally no problem in transmitting images in PNG format. However, in the field of mobile networks, portable devices such as mobile phones and PDAs are generally used, whic...

Claims

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Application Information

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IPC IPC(8): H04N1/413
Inventor 李春雨黎志强罗庆波
Owner 融创天下(上海)科技发展有限公司
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