A dual-frequency wireless image transmission system and method

Abstract

The invention discloses a dual-frequency wireless image transmission system, which includes a transmitter and a receiver, wherein the transmitter includes a video input module, the video input module is connected to a video encoding module, and the video encoding module is connected to two transmitting modules; the receiver includes a first receiving module and a second receiving module; the first receiving module and the second receiving module are both connected to a video decoding module, and the video decoding module is connected to a video output module; a method for image transmission using a dual-frequency wireless image transmission system: image data is split into N frames of data, two WIFI transmitting modules and a WIFI receiving module are used for transmission, a video decoding module checks the correctness of the data, and all correct data are assembled into a complete image data. This solution solves the problem of poor anti-interference ability of a single frequency in wireless transmission; by adding a transmitting module and a receiving module, two-way transmission and reception are realized, and high-reliability transmission is achieved at a low cost.

Description

Technical Field

[0001] The present invention relates to the technical field of image transmission, and in particular to a dual-frequency wireless image transmission system and method. Background Art

[0002] The wireless image transmission system is a device that transmits video images acquired by cameras, camcorders, video playback devices and other video sources remotely via wireless means. It is widely used in the security and film and television industries.

[0003] When known wireless image transmission products are working, the working mechanisms of the wireless part can be divided into three categories:

[0004] The first type is that when it is working, the wireless frequency is a fixed frequency. If it is interfered by other wireless signals of the same frequency during use, it will cause screen freezes, screen distortion or mosaics, etc., resulting in poor user experience and very limited product application scenarios.

[0005] The second type of product avoids co-frequency interference by automatically switching frequencies when encountering interference. That is, during operation, it will periodically detect the surrounding wireless environment. If the frequency used by the product itself has strong interference, it will switch to other frequencies to work. The stability of the second type of product is better than that of the first type, but during the frequency switching process, problems such as temporary freeze or black screen may occur.

[0006] The third category uses frequency hopping technology, that is, the frequency is constantly changing during the operation of the product to avoid interference from a certain frequency; the third category of products has good stability, but is difficult to develop and has high costs. Summary of the invention

[0007] In view of the above-mentioned deficiencies in the prior art, the present invention provides a dual-frequency wireless image transmission system and method for improving the anti-interference capability of a product.

[0008] In order to achieve the above-mentioned object of the invention, the technical solution adopted by the present invention is:

[0009] A dual-frequency wireless image transmission system is provided, which includes a transmitter and a receiver, wherein the transmitter includes a video input module, and the video input module is connected to a video encoding module;

[0010] The video input module is used to convert the input video source;

[0011] The video encoding module is used to convert the input video source into N frames of data, and convert each frame of data into N packets of data;

[0012] The video encoding module is connected to the first transmitting module and the second transmitting module respectively; the receiver includes a first receiving module and a second receiving module; the first transmitting module is wirelessly connected to the first receiving module, and the second transmitting module is wirelessly connected to the second receiving module;

[0013] The first transmitting module is used to send N packets of data to the first receiving module at a set frequency, and the second transmitting module is used to send N packets of data to the second receiving module at a set frequency;

[0014] The first receiving module and the second receiving module are both connected to the video decoding module, and the video decoding module is connected to the video output module;

[0015] The video decoding module is used to obtain N packets of data received by the first receiving module and the second receiving module, merge the N packets of data into video data, and send the video data to the video output module.

[0016] A method for image transmission using a dual-frequency wireless image transmission system is provided, comprising the following steps:

[0017] S1: The video encoding module splits the image data input by the video input module into N frames of data;

[0018] S2: split each frame into N packets of data, and number each packet of data 1, 2, .., N;

[0019] S3: Use two WIFI transmitting modules to transmit N packets of data respectively, and send them to two WIFI receiving modules. Different frequencies are used for transmission between the two WIFI transmitting modules and the WIFI receiving modules;

[0020] S4: After receiving N packets of data respectively, the two WIFI receiving modules send the N packets of data to the video decoding module;

[0021] S5: The video decoding module checks the correctness of each packet of data. If it is correct, it proceeds to the next step. Otherwise, it requests the WIFI transmission module to resend the packet of data.

[0022] S6: Assemble all correct N packets of data into one frame of data, and restore N frames of data in sequence;

[0023] S7: Assemble N frames of data into a complete image data.

[0024] The beneficial effects of the present invention are as follows: the present invention solves the problem of poor anti-interference ability of a single frequency in wireless transmission; by adding a transmitting module and a receiving module, two-way transmission and reception are realized, and high-reliability transmission is achieved at low cost; the reliability problem of the wireless image transmission system in a complex wireless environment is solved; and the application scenarios of the wireless image transmission system are expanded. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is the structural block diagram of the dual-frequency wireless image transmission system.

[0026] Figure 2 This is the image transmission principle diagram of the transmitter.

[0027] Figure 3 This is the image transmission principle diagram of the receiver. DETAILED DESCRIPTION

[0028] The specific implementation modes of the present invention are described below so that those skilled in the art can understand the present invention. However, it should be clear that the present invention is not limited to the scope of the specific implementation modes. For those of ordinary skill in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the attached claims, these changes are obvious, and all inventions and creations utilizing the concept of the present invention are protected.

[0029] like Figures 1 to 3 As shown, the dual-frequency wireless image transmission system of the present scheme includes a transmitter and a receiver, the transmitter includes a video input module, and the video input module is connected to a video encoding module; the video input module is used to convert the input video source, and the video encoding module is used to convert the input video source into N frames of data, and convert each frame of data into N packets of data.

[0030] The video encoding module is connected to the first transmitting module and the second transmitting module respectively; the receiver includes a first receiving module and a second receiving module; the first transmitting module is wirelessly connected to the first receiving module, and the second transmitting module is wirelessly connected to the second receiving module; the first transmitting module is used to send N packets of data to the first receiving module at a set frequency, and the second transmitting module is used to send N packets of data to the second receiving module at a set frequency.

[0031] The first receiving module and the second receiving module are both connected to the video decoding module, and the video decoding module is connected to the video output module; the video decoding module is used to obtain N packets of data received by the first receiving module and the second receiving module, merge the N packets of data into video data, and send them to the video output module.

[0032] The first receiving module and the second receiving module both adopt WIFI receiving modules, and the first transmitting module and the second transmitting module both adopt WIFI transmitting modules.

[0033] This solution uses two wireless channels for data transmission. In theory, the two image data are exactly the same. However, in practical applications, due to loss, interference and other reasons during the transmission process, some of the two image data may be erroneous or lost. Before decoding, the video decoding module needs to merge the two image data into a complete image and then output it.

[0034] Because the two transmitting modules operate at different frequencies, the probability of both being interfered with at the same time will be greatly reduced compared to the probability of a single frequency being interfered with. For a frame of image data, the probability of the same byte of data in the two channels of image data being interfered with will be further greatly reduced. By removing the interfered data in the two channels of images and fusing the useful data, a complete image can be formed.

[0035] The anti-interference capability of wireless transmission in this solution has been greatly improved, and the stability of video transmission is much higher than that of existing technology products. Since there is no frequency switching, there is no black screen problem during the switching process.

[0036] In this solution, the signal transmission frequency between the first receiving module and the first transmitting module is preferably 2.4 GHz, and the signal transmission frequency between the second receiving module and the second transmitting module is preferably 5 GHz.

[0037] Because image transmission requires a higher bandwidth, and WIFI has the advantages of high bandwidth, mature technology, low cost, etc. In this embodiment, both the transmitting module and the receiving module use WIFI technology, the first receiving module and the transmitting module use 2.4GHz, and the second receiving module and the transmitting module use 5GHz. The advantage of this design is that the 2.4GHz and 5GHz frequencies are far apart, and the two modules will not interfere with each other.

[0038] The advantage of 2.4GHz is that it has a relatively long wavelength and stronger diffraction ability, but its disadvantage is that it has fewer channels; while the diffraction ability of 5GHz WIFI is poor, but it has more channels and a larger data bandwidth. The two complement each other and can further improve the reliability of transmission. When sending image data, the two transmission modules can send a frame of image data at the same time, or send a frame of image data in sequence. It is preferred to send it at the same time, which can reduce transmission delay.

[0039] In this solution, it is also preferred that the signal transmission frequency between the first receiving module and the first transmitting module, and between the second receiving module and the second transmitting module is 5 GHz.

[0040] Taking advantage of the higher bandwidth and more channels of 5GHz WIFI, the two 5GHz WIFI signals will interfere with each other. By adding a bandpass filter, the RF signals of the two WIFIs are limited to their operating frequencies. One of them works in band 1 and the other works in band 2 or band 3, avoiding mutual interference between the two 5GHz WIFI signals and also improving the product's transmission anti-interference ability.

[0041] This scheme utilizes the image transmission method of the above dual-frequency wireless image transmission system, including the following steps:

[0042] S1: The video encoding module splits the image data input by the video input module into N frames of data;

[0043] S2: split and pack each frame of data into N packets of data, and number each packet 1, 2, .., N;

[0044] S3: Use two WIFI transmitting modules to transmit N packets of data respectively, and send them to two WIFI receiving modules. Different frequencies are used for transmission between the two WIFI transmitting modules and the WIFI receiving modules;

[0045] The transmission method of the WIFI transmitting module and the WIFI receiving module is: one WIFI transmitting module and one WIFI receiving module transmit N packets of data in a sequential numbering manner, and another WIFI transmitting module and another WIFI receiving module transmit N packets of data in a reverse numbering manner.

[0046] S4: After receiving N packets of data respectively, the two WIFI receiving modules send the N packets of data to the video decoding module;

[0047] S5: The video decoding module checks the correctness of each packet of data. If it is correct, it proceeds to the next step, otherwise it requests the WIFI transmission module to resend the packet of data; including:

[0048] S51: The video decoding module checks the correctness of each packet of data. If one of the WIFI receiving modules receives a packet with an error, the module checks the data in the packet with the same number as the packet received by another WIFI receiving module.

[0049] S52: If correct, the packet data received by another WIFI receiving module is used; otherwise, two WIFI transmitting modules are requested to resend the packet data.

[0050] S6: Assemble all correct N packets of data into one frame of data, and restore N frames of data in sequence;

[0051] S7: Assemble N frames of data into a complete image data.

[0052] This solution solves the problem of poor anti-interference ability of a single frequency in wireless transmission; by adding a transmitting module and a receiving module, two-way transmission and reception are realized, and high-reliability transmission is achieved at low cost; the reliability problem of the wireless image transmission system in a complex wireless environment is solved; and the application scenarios of the wireless image transmission system are expanded.

Claims

1. A dual-frequency wireless image transmission system, characterized in that: It includes a transmitter and a receiver, wherein the transmitter includes a video input module, and the video input module is connected to a video encoding module; The video input module is used to convert the input video source; The video encoding module is used to convert the input video source into N frames of data, and convert each frame of data into N packets of data; The video encoding module is connected to the first transmitting module and the second transmitting module respectively; the receiver includes a first receiving module and a second receiving module; the first transmitting module is wirelessly connected to the first receiving module, and the second transmitting module is wirelessly connected to the second receiving module; The first transmitting module is used to send N packets of data to the first receiving module at a set frequency, and the second transmitting module is used to send N packets of data to the second receiving module at a set frequency; The first receiving module and the second receiving module are both connected to the video decoding module, and the video decoding module is connected to the video output module; The video decoding module is used to obtain N packets of data received by the first receiving module and the second receiving module, merge the N packets of data into video data, and send the video data to the video output module.

2. The dual-frequency wireless image transmission system according to claim 1, characterized in that: The first receiving module and the second receiving module both adopt WIFI receiving modules, and the first transmitting module and the second transmitting module both adopt WIFI transmitting modules.

3. The dual-frequency wireless image transmission system according to claim 2, characterized in that: The signal transmission frequency between the first receiving module and the first transmitting module is 2.4 GHz, and the signal transmission frequency between the second receiving module and the second transmitting module is 5 GHz.

4. The dual-frequency wireless image transmission system according to claim 2, characterized in that: The signal transmission frequencies between the first receiving module and the first transmitting module, and between the second receiving module and the second transmitting module are all 5 GHz; ports of the first receiving module, the first transmitting module, the second receiving module and the second transmitting module are all connected to bandpass filters.

5. An image transmission method using the dual-frequency wireless image transmission system according to any one of claims 1 to 4, characterized in that: The following steps are involved: S1: The video encoding module splits the image data input by the video input module into N frames of data; S2: split each frame into N packets of data, and number each packet of data 1, 2, .., N; S3: Use two WIFI transmitting modules to transmit N packets of data respectively, and send them to two WIFI receiving modules. Different frequencies are used for transmission between the two WIFI transmitting modules and the WIFI receiving modules; S4: After receiving N packets of data respectively, the two WIFI receiving modules send the N packets of data to the video decoding module; S5: The video decoding module checks the correctness of each packet of data. If it is correct, it proceeds to the next step. Otherwise, it requests the WIFI transmission module to resend the packet of data. S6: Assemble all correct N packets of data into one frame of data, and restore N frames of data in sequence; S7: Assemble N frames of data into a complete image data; The step S5 comprises: S51: The video decoding module checks the correctness of each packet. If the data in one packet received by one of the WIFI receiving modules is wrong, the video decoding module checks the data of the packet with the same number as the packet received by another WIFI receiving module. S52: If it is correct, the packet data received by another WIFI receiving module is used; otherwise, two WIFI transmitting modules are requested to resend the packet data; The transmission method of the WIFI transmitting module and the WIFI receiving module in step S3 is: one WIFI transmitting module and one WIFI receiving module transmit N packets of data in a sequential numbering manner, and another WIFI transmitting module and another WIFI receiving module transmit N packets of data in a reverse numbering manner.

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