CN102957903A

CN102957903A - Photo and video low-distortion compression and transmission method based on 3G (third generation) network communication

Info

Publication number: CN102957903A
Application number: CN201110243877XA
Authority: CN
Inventors: 赵翔
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-08-24
Filing date: 2011-08-24
Publication date: 2013-03-06

Abstract

The invention provides a photo and video low-distortion compression and transmission method based on 3G (third generation) network communication and relates to the field of communication terminals. Each communication terminal has an identifier of a 3G operator. A background server performs special high-magnification compression and transmission to corresponding photos and videos required to be transmitted to the communication terminals for displaying according to the identifiers of the communication terminals. Physiological characteristics of human eyes and display parameters of a digital display are analyzed, the physiological characteristics and the display parameters are compressed at maximum compression ratio when human eyes watch the communication terminals but cannot observe distortion, and the physiological characteristics and the display parameters are packed under a novel data format, so that low-flow high-speed transmission is suitable for a 3G mobile network.

Description

Photo and video low distortion compression transmitting method based on the 3G network communication

Technical field

The present invention designs field of communication.

Background technology

Communicating terminal is a kind of electronic display unit.Its major function is that digitized photo is shown on the LCDs of self.Generally speaking, by USB flash disk or digital memory card, the digital photos information decoding on USB flash disk or the card is played on the screen.Our this communicating terminal system, the user can be on computers, and by 3G network, backward compatible EDGE/GPRS/CDMA network transmits photo, the multimedia messagess such as video on the 3G network communicating terminal.Because the transmission rate of 3G/EDGE/GPRS/CDMA are higher, require as far as possible compressing multimedia data, but can not affect visual effect again.

Summary of the invention

Purpose of the present invention is to provide a kind of multimedia transmission method that can the high speed low discharge, and the distortion factor that the user can not be observed the multimedia messagess such as photograph video with human eye shows to communicating terminal.

In order to achieve this end, the present invention adopts series of steps:

With the multimedia messagess such as photograph video of needs transmission, carry out the color model conversion, be converted to the HSI color model of feeling based on human eye.

Different to the susceptibility of H/S/I component according to human eye, formulate different compressibility factors, compress.

Data after the compression are packed, form less data volume, transmit by the 3G/EDGE/GPRS/CDMA network.

After arriving communicating terminal, the decoding data with packing is played on the communicating terminal.

Embodiment

Below in conjunction with example the present invention is further elaborated.

Owing to user's the multimedias such as photograph video need to be sent to communicating terminal by the 3G/EDGE/GPRS/CDMA network, and present stage mobile operator is high to the data flow charging, therefore need as much as possible data are compressed transmission, and the sight of loss of energy photograph video not.Therefore, we will be in the distortion situation that human eye can not be perceived, the maximum compression data.

Through the analysis to the physiological property of human eye, we can learn, the vision system of human eye is best the most accurate image processing system in the world, but it is perfect far from.The vision system of human eye is heterogeneous and nonlinear to the cognition of image, is not can both perception to any variation in the image.For example the image change that causes of the quantization error of image coefficient is to perceive for human eye within the specific limits.We take full advantage of human visual system's Some features in encoding scheme, just can obtain high compression ratio.Therefore we are by the further investigation to human-eye visual characteristic, and the Mathematical Modeling of some image compression that rebulid enlarges compression ratio.

The human visual system has special powerful function in the identification to object; But in the absolute estimation to gray scale, distance and area some shortcoming is arranged; See Fig. 1.

Column and cone two class visual reception devices are arranged on the retina:

Depending on cylinder (Rods): elongated and thin, quantitatively approximately 7,500 ten thousand～100,000,000 000 ten thousand, they provide scotopia, i.e. eye response when low order of magnitude brightness, its luminous sensitivity is high.

View frustums (Cons): short on the structure quantity is few and thick, and approximately 6,000,000～7,000,000, luminous sensitivity is lower, and they provide look daytime, and its response light brightness range ratio is looked high 5～6 orders of magnitude of cylinder.That two kinds of cellula visualises work simultaneously in the intermediate luminance scope.View frustums concentrate be distributed in foveal region of retina little recessed in.

The human visual system has logarithmic property to the response of brightness, is dull non linear system.This is non-linear near 1/3 power exponential function.Human eye reaches wide 108 the visual brightness scope that reaches by this logarithmic property.But under the condition of fixed background light, accommodation is not wide, approximately tens gray scales.Eyes are nonlinear to the response of light intensity.Light intensity is surrounded by background intensity I by the fritter of I+ Δ I, and then noticeable difference DELTA I is the function of I, namely to the vision sensitivity be contrast, rather than brightness value itself.

From people's subjective sensation angle, color comprises three key elements:

1. tone (hue): the classification of tone reflection color, as red, green, blue etc.Tone is the different wave length in the corresponding spectral distribution roughly.

2. saturation (Saturation)

Saturation refers to the depth or the pure degree of color that colourama presents.For the colourama of same tone, its saturation is higher, and color relation is darker, or purer; And saturation is less, and color relation is more shallow, or purity is lower.The colourama of high saturation can reduce purity or shoals because mixing white light, becomes the coloured light of low saturation.The coloured light of 100% saturation just represents the pure color light of not sneaking into white light fully.

3. lightness (luminance)

Lightness is the sensation of the bright degree that causes when human eye of light action.In general, it is bright that the colourama energy greatly then seems, otherwise then dark.

A large number of experiments show that, people's eyes can be differentiated 128 kinds of different tones, 10 1 30 kinds of different saturations, and very responsive to brightness.Human eye approximately can be differentiated 350,000 kinds of colors.

For the people, can come define color (HSL color model) by tone, saturation and brightness; Fig. 3 is seen in the color description space.For display device, can color (RGB color model) be described with the luminous quantity of red, green, blue phosphor; Fig. 2 is seen in the color description space.

Overwhelming majority visible spectrum can represent with the mixing of red, green and blue (RGB) three coloured light by different proportion and intensity.

The user sends to the image information on the server, all is the rgb color expression mode that is suitable for showing.Therefore, the image that we will describe this RGB change the understandable HSI pattern of human vision into, and according to the physiological property of human eye, people's eyes can be differentiated 128 kinds of different tones, the saturation that the 10-30 kind is different, and very responsive to brightness.We set up for the different compressibility factor of the different components of H/S/I, to obtain larger compression ratio.

After the compression, the result's packing with obtaining by the 3G/EDGE/GPRS/CDMA network, sends to communicating terminal.The data that communicating terminal obtains compressing are decoded, and change the RGB pattern into, are played on the display screen of communicating terminal.

Flow process is seen Fig. 4.

The RGB Mode change is to the HSI pattern, and formula is seen Fig. 5.

The HIS Mode change is to the RGB pattern, and formula is seen Fig. 6.

The above; it only is one of the specific embodiment of the present invention; but protection scope of the present invention is not limited to this; any those of ordinary skill in the art are in the disclosed technical scope of the present invention; variation or the replacement that can expect without creative work all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range that claims were limited.

Claims

1. photo and video low distortion compression transmitting method based on a 3G network communication, by 3G network and backward compatible EDGE/GRPS/CDMA, it is characterized in that: step is as follows:

Each communicating terminal has the sign ID of a mobile operator, identification id as equipment, background server sends corresponding image, the multimedia messagess such as video according to this identification id, the data such as image/video are in the conversion of background server process, human eye does not observe in the situation of distortion at the display screen of communicating terminal, and at tone, saturation and luminance component carry out the high compression ratio compression, after the packing encapsulation, be transferred on the communicating terminal by the 3G communication network.

2. method according to claim 1, it is characterized in that: communicating terminal links to each other with the Internet with the wireless communication networks of 3G or backward compatible GPRS/EDGE/CDMA pattern, is connected to background server.

3. method according to claim 1 is characterized in that: the multimedia information datas such as image/video, before being transferred to the communicating terminal end, carried out the high compression ratio compression.

4. method according to claim 1 is characterized in that: the multimedia information datas such as image/video, with the RGB pattern description, before compression, change the HSI description scheme that is fit to eye-observation into, be convenient to the physiological characteristic according to human eye, carry out the high compression ratio compression.

5. method according to claim 1, it is characterized in that: the multimedia information data of image/video is the physiological characteristic according to human eye, sets compressibility factor, according to the susceptibility of human eye, respectively with no compression factor, compression H, S, I component is to obtain larger compression ratio.

6. method according to claim 1, it is characterized in that: background server is with the multi-medium datas such as image/video of compression, by the wireless communication networks of 3G and backward compatible EDGE/GPRS/CDMA pattern, the form packing with own is transferred to the communicating terminal end.

7. method according to claim 1, it is characterized in that: the user can pass through lettergram mode, and the information such as transmission image/video are to special email box, and background server is by regularly inquiring about mail, obtain mail inner multimedia information, background server sends to the communicating terminal end immediately.