CN110515570B - Picture data compression transmission printing method based on BLE technology - Google Patents
Picture data compression transmission printing method based on BLE technology Download PDFInfo
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- CN110515570B CN110515570B CN201910809715.4A CN201910809715A CN110515570B CN 110515570 B CN110515570 B CN 110515570B CN 201910809715 A CN201910809715 A CN 201910809715A CN 110515570 B CN110515570 B CN 110515570B
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- ble
- picture
- data terminal
- mobile data
- bluetooth
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 230000005540 biological transmission Effects 0.000 title claims abstract description 20
- 238000005516 engineering process Methods 0.000 title claims abstract description 19
- 238000013144 data compression Methods 0.000 title claims abstract description 15
- 238000007906 compression Methods 0.000 claims description 6
- 230000006835 compression Effects 0.000 claims description 6
- 230000003993 interaction Effects 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 239000004984 smart glass Substances 0.000 claims description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000006243 chemical reaction Methods 0.000 description 4
- 101150035983 str1 gene Proteins 0.000 description 4
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/12—Digital output to print unit, e.g. line printer, chain printer
- G06F3/1201—Dedicated interfaces to print systems
- G06F3/1278—Dedicated interfaces to print systems specifically adapted to adopt a particular infrastructure
- G06F3/1292—Mobile client, e.g. wireless printing
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/80—Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
- H04W76/14—Direct-mode setup
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W8/00—Network data management
- H04W8/005—Discovery of network devices, e.g. terminals
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Theoretical Computer Science (AREA)
- Databases & Information Systems (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Editing Of Facsimile Originals (AREA)
Abstract
The invention belongs to the field of Bluetooth printing methods, and particularly relates to a picture data compression transmission printing method based on BLE technology, which comprises the following steps that firstly, a mobile data terminal searches Bluetooth printing equipment, and BLE connection is established and data is transmitted; step two, a user selects a digital picture to be printed through the mobile data terminal; the mobile data terminal converts the digital picture into hexadecimal character strings; step three, the mobile data terminal compresses the character string converted into hexadecimal character string and converts the hexadecimal character string into binary data; and step four, the mobile data terminal transmits binary data to the Bluetooth printing equipment through BLE to carry out paper picture printing operation. The beneficial effects are that: the data compressed by the method reduces half of data volume and greatly improves BLE transmission efficiency.
Description
Technical Field
The invention belongs to the field of Bluetooth printing methods, and particularly relates to a picture data compression transmission printing method based on BLE technology.
Background
With the gradual development and popularization of bluetooth photo printing technology, mobile data terminals generally use two characters (16 bits) to transmit 8-bit graphic data to a bluetooth printing device for photo printing, but the method has disadvantages: when the amount of the print picture data is large, the time consumption is long, the efficiency is low, and the user experience is affected.
Disclosure of Invention
In order to solve the technical problems, the invention provides a picture data compression transmission printing method based on BLE technology, which compresses printing data by optimizing the step flow of the method, thereby improving printing efficiency and user experience.
The specific technical scheme is as follows: a picture data compression transmission printing method based on BLE technology comprises a mobile data terminal and a Bluetooth printing device;
the mobile data terminal comprises a BLE unit;
the Bluetooth printing device comprises a BLE module and a printing module;
the method comprises the following steps:
step one (S101), a mobile data terminal searches Bluetooth printing equipment, and BLE connection is established and data is transmitted;
step two (S102), a user selects a digital picture to be printed through a mobile data terminal; the mobile data terminal converts the digital picture into hexadecimal character strings;
step three (S103), the mobile data terminal compresses the hexadecimal character strings and converts the hexadecimal character strings into binary data;
and step four (S104), the mobile data terminal transmits the binary data to the Bluetooth printing equipment through BLE to carry out paper picture printing operation.
Preferably, the method for compressing, transmitting and printing picture data based on BLE technology specifically comprises the following steps: a user starts a mobile data terminal BLE unit to scan and acquire UUIDs of peripheral Bluetooth devices; and the BLE unit automatically judges the Bluetooth printing equipment according to the agreed UUID characteristic value and is connected with the BLE module and performs data interaction.
Preferably, the second step in the picture data compression transmission printing method based on BLE technology specifically comprises: the printing picture is a black-white picture, so that the conversion of hexadecimal character strings is black-white processing; taking the color value of each point of the picture, comparing the color value with a 128 intermediate value, and if the value is more than 128 and is set to be 1, setting the value to be less than 128 and 0; the algorithm code is as follows:
+ (NSMutableString *)hexFromImage:(UIImage *)image {
NSMutableString *str = [[NSMutableString alloc] init];
...
CGImageRef inImage = image.CGImage;
A g size_t w = CGImageGetWidth(inImage);
size_t h = CGImageGetHeight(inImage);
CGContextRef cgctx = [self createARGBBitemapContextFromImage];
Unsigned char *data = CGBitmapContextGetData(cgctx);
for (int y=0; y<image.size.height; y++){
int bit =128;
int currentValue = 0;
NSMutableString *sb = [[NSMutableString alloc] init];
for (int x = 0; x < image.size.width; x++) {
NSInteger intensity = 0;
int offset = 4*((w*round(y))+round(x));
int alpha = data[offset];
int red = data[offset+1];
int green = data[offset+2];
int blue = data[offset+3];
if (alpha == 0) {
intensity = 0;
}else{
intensity = 255 - (alpha + red + green + blue) / 4;
}
if (intensity >= 128) {
currentValue |= bit;
bit = bit >> 1;
[sb appendString:@"1"];
}else{
currentValue &= ~bit;
bit = bit >> 1;
[sb appendString:@"0"];
}
if (bit == 0) {
[str appendFormat:@"%@",[self ToHex:currentValue]];
bit = 128;
currentValue = 0;
}
}
}
...
return str;
}
and splicing the values obtained from each point of the picture into a character string, and providing the character string for compression in the third step.
Preferably, the method for compressing, transmitting and printing picture data based on BLE technology comprises the following steps: the mobile data terminal compresses and converts the obtained hexadecimal character strings into binary;
the algorithm code is as follows:
compression of 8-bit graphic data of two character string representations into 1 character string representation
- (NSdata *)compressImgString:(NSString *)str {
for (int i=0; i<istr.length/2; i++) {
NSString *str = [str substringWithRange:NSMakeRange(i*2, 2)];
NSString *str1 = [str substringWithRange:NSMakeRange(0, 1)];
NSString *str2 = [str substringWithRange:NSMakeRange(1, 1)];
int i = [self intFromStr:str1];
int j = [self intFromStr:str2];
int value = (i<<4) + j;
Byte byte[1] = {value};
[encodeData appendBytes:byte length:1];
}
}
Serial string conversion int of// 16 system
- (int) intFromStr:(NSString *)str {
if ([str isEqualToString:@"0"]) {
return 0;
} else if ([str isEqualToString:@"1"]) {
return 1;
} else if ([str isEqualToString:@"2"]) {
return 2;
...
}
else if ([str isEqualToString:@"9"]) {
return 9;
} else if ([str isEqualToString:@"A"]) {
return 10;
}
...
else if ([str isEqualToString:@"F"]) {
return 15;
}
return 0;
}
Preferably, the mobile data terminal related to the picture data compression transmission printing method based on the BLE technology is a smart phone, a tablet computer, a notebook computer, a smart watch or smart glasses; the Bluetooth printing device is a handheld Bluetooth printer.
Preferably, in the picture data compression transmission printing method based on the BLE technology, a user controls the mobile data terminal by controlling the APP.
After the technical scheme is adopted, the invention has the beneficial effects that:
compared with the disclosed technical scheme, the technical scheme solves the problems of long picture data transmission time, low efficiency, poor user experience and the like in the picture data transmission method in the prior art by using the picture data Bluetooth transmission printing system and method. The data compressed by the method reduces half of data volume and greatly improves BLE transmission efficiency; through actual measurement contrast, the example of the compression algorithm is added, the printing speed is obviously improved, the picture effect can also reach the customer requirement, and the user experience is greatly improved.
Drawings
Fig. 1 is a schematic diagram of a system involved in a picture data compression transmission printing method based on BLE technology;
fig. 2 is a flowchart illustrating steps of a picture data compression transmission printing method based on BLE technology.
Detailed Description
The system shown in fig. 1 comprises a mobile data terminal and a bluetooth printing device;
the mobile data terminal comprises a BLE unit;
bluetooth printing device includes BLE module, print module.
The mobile data terminal can be a smart phone, a tablet computer, a notebook computer, a smart watch, smart glasses and the like; in the mobile data terminal of the embodiment, a part of smart phone is taken as an example; the bluetooth printing apparatus is exemplified by a hand-held bluetooth printer.
Please refer to fig. 2, which is a picture data compression transmission printing method based on BLE technology, which mainly includes the following steps:
step one (S101), searching a handheld Bluetooth printer by using a smart phone APP, establishing BLE connection and transmitting data; a user starts a BLE unit of the smart phone to scan and acquire UUIDs of peripheral Bluetooth devices; and the BLE unit automatically judges the handheld Bluetooth printer according to the agreed UUID characteristic value and is connected with the BLE module and performs data interaction.
Step two (S102), a user selects a digital picture to be printed through a smart phone APP; the intelligent mobile phone APP converts the digital picture into hexadecimal character strings; the printing picture is a black-white picture, so that the conversion of hexadecimal character strings is black-white processing; taking the color value of each point of the picture, comparing the color value with a 128 intermediate value, and if the value is more than 128 and is set to be 1, setting the value to be less than 128 and 0; the algorithm code is as follows:
+ (NSMutableString *)hexFromImage:(UIImage *)image {
NSMutableString *str = [[NSMutableString alloc] init];
...
CGImageRef inImage = image.CGImage;
A g size_t w = CGImageGetWidth(inImage);
size_t h = CGImageGetHeight(inImage);
CGContextRef cgctx = [self createARGBBitemapContextFromImage];
Unsigned char *data = CGBitmapContextGetData(cgctx);
for (int y=0; y<image.size.height; y++){
int bit =128;
int currentValue = 0;
NSMutableString *sb = [[NSMutableString alloc] init];
for (int x = 0; x < image.size.width; x++) {
NSInteger intensity = 0;
int offset = 4*((w*round(y))+round(x));
int alpha = data[offset];
int red = data[offset+1];
int green = data[offset+2];
int blue = data[offset+3];
if (alpha == 0) {
intensity = 0;
}else{
intensity = 255 - (alpha + red + green + blue) / 4;
}
if (intensity >= 128) {
currentValue |= bit;
bit = bit >> 1;
[sb appendString:@"1"];
}else{
currentValue &= ~bit;
bit = bit >> 1;
[sb appendString:@"0"];
}
if (bit == 0) {
[str appendFormat:@"%@",[self ToHex:currentValue]];
bit = 128;
currentValue = 0;
}
}
}
...
return str;
}
and splicing the values obtained from each point of the picture into a character string, and providing the character string for compression in the third step.
Step three (S103), the smart phone APP converts the hexadecimal character strings into hexadecimal character strings to be compressed and converted into binary data;
the algorithm code is as follows:
compression of 8-bit graphic data of two character string representations into 1 character string representation
- (NSdata *)compressImgString:(NSString *)str {
for (int i=0; i<istr.length/2; i++) {
NSString *str = [str substringWithRange:NSMakeRange(i*2, 2)];
NSString *str1 = [str substringWithRange:NSMakeRange(0, 1)];
NSString *str2 = [str substringWithRange:NSMakeRange(1, 1)];
int i = [self intFromStr:str1];
int j = [self intFromStr:str2];
int value = (i<<4) + j;
Byte byte[1] = {value};
[encodeData appendBytes:byte length:1];
}
}
Serial string conversion int of// 16 system
- (int) intFromStr:(NSString *)str {
if ([str isEqualToString:@"0"]) {
return 0;
} else if ([str isEqualToString:@"1"]) {
return 1;
} else if ([str isEqualToString:@"2"]) {
return 2;
}
...
else if ([str isEqualToString:@"9"]) {
return 9;
} else if ([str isEqualToString:@"A"]) {
return 10;
...
}
else if ([str isEqualToString:@"F"]) {
return 15;
}
return 0;
}
And step four (S104), the smart phone APP transmits binary data to the handheld Bluetooth printer through BLE to carry out paper picture printing operation.
It is known from the technical knowledge that the present technical solution can be implemented by other embodiments without departing from the spirit or essential characteristics thereof. Accordingly, the above disclosed embodiments are illustrative in all respects, and not exclusive. All changes that come within the scope of the invention or equivalents thereto are intended to be embraced therein.
Claims (4)
1. A picture data compression transmission printing method based on BLE technology comprises a mobile data terminal and a Bluetooth printing device;
the mobile data terminal comprises a BLE unit;
the Bluetooth printing device comprises a BLE module and a printing module;
the method is characterized by comprising the following steps of:
step one (S101), a mobile data terminal searches Bluetooth printing equipment, and BLE connection is established and data is transmitted;
step two (S102), a user selects a digital picture to be printed through a mobile data terminal; the mobile data terminal converts the digital picture into hexadecimal character strings;
step three (S103), the mobile data terminal compresses the hexadecimal character strings and converts the hexadecimal character strings into binary data;
step four (S104), the mobile data terminal transmits binary data to the Bluetooth printing equipment through BLE to carry out paper picture printing operation;
the second step is specifically as follows: the print picture is a black-and-white picture; converting hexadecimal character strings into black and white processing; taking the color value of each point of the picture, comparing the color value with a 128 intermediate value, and if the value is more than 128 and is set to be 1, setting the value to be less than 128 and 0; the algorithm code is as follows:
splicing the values obtained from each point of the picture into a character string, and providing the character string for compression in the third step;
the third step is specifically as follows: the mobile data terminal compresses and converts the obtained hexadecimal character strings into binary;
the algorithm code is as follows:
2. the method for compressing, transmitting and printing picture data based on BLE technology according to claim 1, wherein the first step is as follows: a user starts a mobile data terminal BLE unit to scan and acquire UUIDs of peripheral Bluetooth devices; and the BLE unit automatically judges the Bluetooth printing equipment according to the agreed UUID characteristic value and is connected with the BLE module and performs data interaction.
3. The BLE technology-based picture data compression transmission printing method according to claim 1, wherein: the mobile data terminal is a smart phone, a tablet personal computer, a notebook computer, a smart watch and smart glasses; the Bluetooth printing device is a handheld Bluetooth printer.
4. The BLE technology-based picture data compression transmission printing method according to claim 1, wherein: the user controls the mobile data terminal by manipulating the APP.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910809715.4A CN110515570B (en) | 2019-08-29 | 2019-08-29 | Picture data compression transmission printing method based on BLE technology |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910809715.4A CN110515570B (en) | 2019-08-29 | 2019-08-29 | Picture data compression transmission printing method based on BLE technology |
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|---|---|
| CN110515570A CN110515570A (en) | 2019-11-29 |
| CN110515570B true CN110515570B (en) | 2024-02-13 |
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| CN201910809715.4A Active CN110515570B (en) | 2019-08-29 | 2019-08-29 | Picture data compression transmission printing method based on BLE technology |
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| CN119342080A (en) * | 2024-12-19 | 2025-01-21 | 国网山东省电力公司莒县供电公司 | Directional movement automatic control method and device for substation switch cabinet placement |
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|---|---|---|---|---|
| CN1137649A (en) * | 1995-02-09 | 1996-12-11 | 佳能株式会社 | Printing system, printing apparatus, information processing apparatus and storage medium storing font download control program |
| US6166824A (en) * | 1997-01-22 | 2000-12-26 | Brother Kogyo Kabushiki Kaisha | Print data processing and compression apparatus |
| CN101498996A (en) * | 2008-02-02 | 2009-08-05 | 艾威梯软件技术(北京)有限公司 | Method and equipment for printing based on Bluetooth communication |
| EP2565775A2 (en) * | 2011-09-01 | 2013-03-06 | Heidelberger Druckmaschinen AG | Method for producing a printed product |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070247655A1 (en) * | 2006-04-21 | 2007-10-25 | Microsoft Corporation | Dynamic printer system |
| JP4953905B2 (en) * | 2007-04-27 | 2012-06-13 | キヤノン株式会社 | Image processing apparatus, image processing method, and program |
-
2019
- 2019-08-29 CN CN201910809715.4A patent/CN110515570B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1137649A (en) * | 1995-02-09 | 1996-12-11 | 佳能株式会社 | Printing system, printing apparatus, information processing apparatus and storage medium storing font download control program |
| US6166824A (en) * | 1997-01-22 | 2000-12-26 | Brother Kogyo Kabushiki Kaisha | Print data processing and compression apparatus |
| CN101498996A (en) * | 2008-02-02 | 2009-08-05 | 艾威梯软件技术(北京)有限公司 | Method and equipment for printing based on Bluetooth communication |
| EP2565775A2 (en) * | 2011-09-01 | 2013-03-06 | Heidelberger Druckmaschinen AG | Method for producing a printed product |
Non-Patent Citations (2)
| Title |
|---|
| NSMakeRange用法;贴身护卫;《CSDN》;20141126;第1页 * |
| 将RGBA颜色转换为16进制的颜色;前端精髓;《CSDN》;20180811;第1页 * |
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