KR101446421B1 - System and method for transmitting image - Google Patents

Abstract

Disclosed are a device and a method to transmit an image to increase the transmission distance of high resolution. A device to transmit an image can include a point determining part which determines a compressibility changing point using input image transmission based on the size of an encoding image which is an encoding input image; a compressibility determination part which determines an optimized compressibility for the input image based on the size of the coded image of the point; and an encoding part which encodes an input image using the optimized compressibility for the input image.

Description

[0001] SYSTEM AND METHOD FOR TRANSMITTING IMAGE [0002]

The present invention relates to a video transmission system and method, and more particularly, to a video transmission system and method capable of increasing a transmission distance of a high-resolution video.

Conventional HD-SDI or 3G-SDI transmission systems transmit images using a clock such as 74.25Mhz or 148.5Mhz.

However, when a high resolution image such as an HD class image is transmitted using a clock such as 74.25Mhz or 148.5Mhz, there is a limitation in the distance that can be transmitted due to the size of the image.

Accordingly, there is a demand for a method capable of increasing a transmission distance capable of transmitting a high-resolution image.

Provided is an apparatus and method for encoding an input image into a low-resolution image and correcting the timing information of the input image to a low-resolution image and transmitting the reduced image, thereby increasing a transmission distance for transmitting a high-resolution image by reducing the size of the high- .

According to an aspect of the present invention, there is provided an image transmission apparatus including: a clock generating unit generating a high resolution clock and a low resolution clock; An encoding unit for encoding an input image generated based on the high resolution clock to generate an encoded image; And a timing corrector for correcting data timing information of the encoded image using the low resolution clock.

The timing correction unit of the image transmission apparatus according to an embodiment of the present invention includes a low resolution sync timing information generation unit for generating low resolution sync timing information using the low resolution clock and the sync timing information of the input image; And a timing information correction unit for correcting a clock domain of data timing information of the encoded image using the low-resolution sync timing information.

The image transmission apparatus according to an embodiment of the present invention may further include a transmission unit for transmitting an encoded image in which data timing information is corrected using the low-resolution sync information.

According to an aspect of the present invention, there is provided an image receiving apparatus including: a clock generating unit generating a high resolution clock using a low resolution clock; A timing correcting unit correcting data timing information of an encoded image based on the low resolution clock using the high resolution clock; And a decoding unit decoding the encoded image corrected with the data timing information into a high-resolution input image.

The clock generating unit of the image receiving apparatus according to an embodiment of the present invention includes a reference frequency generating unit for generating a reference frequency by multiplying a low resolution clock; And a high-resolution clock generator for generating a high-resolution clock by demultiplexing the reference frequency.

The timing correction unit of the image receiving apparatus according to an embodiment of the present invention includes a high-resolution sync timing information generating unit for generating high-resolution sync timing information using the high-resolution clock and the sync timing information of the encoded image; And a timing information correction unit for correcting the clock domain of the data timing information of the encoded image using the high-resolution sync timing information.

According to an embodiment of the present invention, there is provided a method of transmitting an image, the method comprising: generating a high-resolution clock and a low-resolution clock; Generating an encoded image by encoding an input image generated based on the high resolution clock; And correcting the data timing information of the encoded image using the low resolution clock.

According to an embodiment of the present invention, there is provided a method of generating a high-resolution clock using a low-resolution clock; Correcting data timing information of an encoded image based on the low resolution clock using the high resolution clock; And decoding the coded image in which the data timing information is corrected into a high-resolution input image.

According to an embodiment of the present invention, the input image is encoded into a low-resolution image, and the timing information of the input image is also corrected to a low-resolution image, thereby reducing the size of the high-resolution image and increasing the transmission distance for transmitting the high- .

1 is a block diagram illustrating an image transmission system according to an exemplary embodiment of the present invention.
2 is a view illustrating an image transmission apparatus according to an embodiment of the present invention.
3 is a diagram illustrating a clock generating unit according to an embodiment of the present invention.
4 is a block diagram illustrating an encoding unit according to an embodiment of the present invention.
5 is a timing correction unit according to an embodiment of the present invention.
6 is a diagram showing an example of sync timing information according to the present invention.
7 is a block diagram illustrating an image receiving apparatus according to an embodiment of the present invention.
8 is a diagram illustrating a clock generating unit according to an embodiment of the present invention.
9 is a timing correction unit according to an embodiment of the present invention.
10 is a flowchart illustrating an image transmission method according to an embodiment of the present invention.
11 is a flowchart illustrating an image encoding method according to an embodiment of the present invention.
12 is a flowchart illustrating a video receiving method according to an embodiment of the present invention.
13 is a flowchart illustrating a video decoding method according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The image transmission method and the image decoding method according to an embodiment of the present invention can be performed by an image transmission apparatus and an image decoding apparatus.

1 is a block diagram illustrating an image transmission system according to an exemplary embodiment of the present invention.

1, an image transmission apparatus 100 according to an exemplary embodiment of the present invention includes a sensor or an ISP 110, an image transmission apparatus 120, an image reception apparatus 130, and an image storage apparatus 140 .

The sensor or ISP 110 may acquire an image and transmit it to the image transmission apparatus 120. For example, the sensor or ISP 110 may be a camera that acquires images in real time, such as CCTV. Also, the sensor or ISP 110 can acquire images at high resolution.

The sensor or ISP 110 may receive the high resolution clock from the image transmission apparatus 120 and acquire the high resolution image using the received high resolution clock.

The image transmission apparatus 120 may reduce the size of the image by encoding the image transmitted by the sensor or the ISP 110 to generate an encoded image.

Specifically, the image transmission apparatus 120 can reduce the size of the input image to the size of the low resolution image by encoding the high-resolution input image transmitted from the sensor or the ISP 110. Next, the image transmission apparatus 120 can convert the input image into a low-resolution encoded image by correcting the data timing information and the sync information of the input image so as to be optimized to a low resolution.

Since the size of the image and the distance over which the image can be transmitted are inversely proportional, the image transmission apparatus 120 converts a large-capacity high-resolution input image into a low-resolution encoded image and transmits the image to a low- The distance can be increased.

The specific configuration and operation of the image transmission apparatus 120 will be described below in detail with reference to FIG.

The image receiving apparatus 130 can decode the high resolution input image from the encoded image received from the image transmission apparatus 120. [ At this time, the image receiving apparatus 130 can correct the data timing information and the sync information received together with the encoded image to be optimized for a high-resolution image. Then, the image receiving apparatus 130 can decode the encoded image into the high-resolution input image with the corrected data timing information and the sync information.

The specific configuration and operation of the video receiving apparatus 130 will be described below in detail with reference to FIG.

The video output apparatus 140 can output the video decoded by the video receiving apparatus 130 to the user.

2 is a view illustrating an image transmission apparatus according to an embodiment of the present invention.

2, an image transmission apparatus 120 according to an exemplary embodiment of the present invention may include a clock generation unit 210, an encoding unit 220, a timing correction unit 230, and a transmission unit 240 have.

The clock generating unit 210 generates a high resolution clock and a low resolution clock using the reference frequency and supplies the generated high resolution clock and low resolution clock to the encoding unit 220, the timing correction unit 230, the sensor or the ISP 110 can do. For example, the high-resolution clock is an HD clock, which can be either 74.25 MHz or 148.5 MHz. Also, the low resolution clock is the SD clock, which may be 27 MHz.

The specific configuration and operation of the clock generating unit 210 will be described in detail with reference to FIG.

At this time, the sensor or the ISP 110 can generate an HD-class high-resolution input image using the high-resolution clock of 74.25 MHz or 148.5 MHz received from the clock generating unit 210.

The encoding unit 220 may encode an input image to generate an encoded image. At this time, the size of the encoded image may be the size of the SD-level low resolution image.

In addition, the encoding unit 220 may monitor the size of the encoded image in the process of encoding the image, and may change the compression rate of the encoded codec based on the size of the encoded image. That is, the encoding unit 120 encodes an image at a different compression rate in one frame according to the size of the encoded image, thereby preventing the size of the encoded image from increasing to a transmission impossibility level or decreasing to a level at which image quality deteriorates have.

The specific configuration and operation of the encoding unit 120 will be described below in detail with reference to FIG.

The timing correction unit 230 can correct the data timing information of the encoded image using the low resolution clock received from the clock generating unit 210. [

Specifically, the timing correction unit 230 corrects the data timing information of the input image to be optimized for the SD-level image, and corrects the sync timing information according to the SD-level image, To the SD image.

The transmission unit 240 can transmit the encoded image corrected by the timing correction unit 230 using the low-resolution sync information output from the timing correction unit 230. [

At this time, the transmission unit 240 can transmit the encoded image through a serializer and a cable driver. At this time, since the size of the encoded image is SD class, the transmission distance of the encoded image may be larger than the transmission distance of the HD class input image.

3 is a diagram illustrating a clock generating unit according to an embodiment of the present invention.

3, the clock generating unit 210 according to an embodiment of the present invention may include a high-resolution clock generating unit 310 and a low-resolution clock generating unit 320. FIG.

The high-resolution clock generator 310 receives the reference frequency from the initial phase locked loop (PLL) or external input, and generates the high-resolution clock by dividing the received reference frequency by 8 or 4. For example, the reference frequency may be 594 MHz.

Specifically, when the high-resolution clock generator 310 divides the reference frequency by 8, a high-resolution clock of 74.25 MHz is generated, and when the reference frequency is divided by four, a high-resolution clock of 148.5 MHz can be generated.

Also, the low-resolution clock generator 320 receives the reference frequency from the initial PLL or the external input, and generates the low-resolution clock of 27 MHz by dividing the received reference frequency by 22 times.

4 is a block diagram illustrating an encoding unit according to an embodiment of the present invention.

Referring to FIG. 4, the encoding unit 220 according to an embodiment of the present invention may include a compression unit 410, a view determination unit 420, and a compression rate determination unit 430.

The compression unit 410 may generate an encoded image by encoding an input image using a still image transmission codec.

At this time, the compression unit 410 receives the compression ratio of the still image transmission codec from the compression rate determination unit 430, and encodes the input image according to the received compression rate.

For example, when starting to encode an input image, the compression unit 410 may receive a default compression rate from the compression rate determination unit 430. [ Next, the compression unit 410 can encode the input image according to the default compression ratio.

The compression unit 410 may receive a new compression rate from the compression rate determination unit 430 when the time determination unit 420 determines the time to change the compression rate of the still image transmission codec. At this time, the compression unit 410 may change the compression rate of the still image transmission codec to a new compression rate, and may code the input image after the current time with a new compression rate. At this time, the new compression rate may be a compression rate determined by the compression rate determination unit 430 as a compression rate optimized for the input image.

The viewpoint determining unit 420 may determine a point of time at which the compression rate of the still image transmission codec is changed based on the size of the encoded image encoded by the compression unit 410. [ In addition, the viewpoint determining unit 420 may insert a tag corresponding to the new compression rate determined by the compression rate determining unit 430 at the time point into the encoded image.

At this time, the viewpoint determining unit 420 may monitor the size of the encoded image to be encoded by the compressing unit 410 in real time, and may determine a time to change the compression rate of the still image transmission codec based on the monitoring result.

For example, when the size of the encoded image increases beyond the first threshold value, the viewpoint determining unit 420 determines the point in time when the size of the encoded image increases to be equal to or larger than the first threshold value as the change rate of the compression rate of the still image transmission codec You can decide. In this case, the first threshold may be a value determined based on the maximum size per frame that the transmitter 240 can transmit.

That is, when the size of the encoded image is equal to or larger than the first threshold value, the view determination unit 420 changes the compression rate of the encoded image, so that the size of the encoded image can be maximized, And the transmission can be prevented from being impossible.

In addition, when the size of the encoded image decreases below the second threshold value, the viewpoint determining unit 420 may determine the point of time when the size of the encoded image decreases below the second threshold value as the point at which the compression rate of the codec is changed . In this case, the second threshold may be a value determined based on the size of the encoded image and the size of the information in which deterioration of image quality occurs.

That is, when the size of the encoded image is equal to or less than the second threshold value, the view determining unit 420 changes the compression rate of the encoded image so that the size of the encoded image is smaller than the size at which the image quality deteriorates, Can be prevented.

The compression rate determination unit 430 may determine a compression rate optimized for the input image based on the size of the encoded image at the time point determined by the viewpoint determination unit 420. [

For example, when the size of the coded image at the time determined by the viewpoint determining unit 420 is equal to or larger than the first threshold value, the compression rate determining unit 430 increases the compression rate so that the size of the coded image after the viewpoint is decreased .

In addition, when the size of the encoded image at the point in time determined by the viewpoint determining unit 420 is less than or equal to the second threshold value, the compression rate determining unit 430 may reduce the compression rate to increase the size of the encoded image after the point in time .

5 is a timing correction unit according to an embodiment of the present invention.

5, the timing corrector 230 according to an exemplary embodiment of the present invention may include a controller 510, a low-resolution sync timing generator 520, and a timing information corrector 530. FIG.

The control unit 510 may generate a control signal corresponding to the encoded image according to the sync timing information of the input image. At this time, the control signal can write the encoded image to the timing information correcting unit 530 and operate the low-resolution sync timing generating unit 520. [

The low-resolution sync timing generator 520 can generate the low-resolution sync timing information using the low-resolution clock and the sync timing information of the input video. At this time, the low resolution sync timing information may be sync information corresponding to the SD timing which is the timing of the low resolution image.

At this time, the low-resolution sync timing information generator 520 may generate the low-resolution sync timing information so that it has the same period as the period of the sync timing information of the input image.

Also, the low-resolution sync timing generator 520 transmits the low-resolution sync timing information and the control signal generated in the timing information corrector 530 to cause the timing information corrector 530 to output the corrected encoded image . At this time, the encoded video information output by the timing correction unit (530) may be a timing at which the data coded image corrected in accordance with the SD quality video.

The timing information correcting unit 530 can correct the clock domain of the data timing information of the encoded video using the low resolution sync timing information received from the low resolution sync timing generating unit 520. [ For example, the timing information correction unit 530 may be a dual-port SRAM (DPSRAM) or a frame buffer.

6 is a diagram showing an example of sync timing information according to the present invention.

6 is an example of the high-resolution sync timing information such as the sync timing information of the input image and the low-resolution sync timing information generated by the low-resolution sync timing information generating section 520. [

The high-resolution sync timing information may be composed of Hsync 610 and Vsync 620 as shown in FIG.

At this time, the Hsync 610 may be constituted by a number of Ha (611) with a high resolution clock of 74.25 MHz. In addition, the Vsync 620 may include Hsync 610 of Va1 (621).

 Therefore, the period of the high-resolution sync timing information may be Ha * Va / 74.25 (us).

Also, the low-resolution sync timing information may be composed of an Hsync 630 and a Vsync 640.

At this time, the Hsync 630 may include Hsync configured by the number of Hb1 (631) and Hsync composed of the number of Hb2 (632) with a low resolution clock of 27 MHz. In addition, the Vsync 640 may include 641 Hsync composed of Hb1 631 and Hsync composed of Hb2 632 including 642 Vb2.

Therefore, the period of the low-resolution sync timing information may be (Hb1 * Vb1 + Hb2 * Vb2) / 27 (us).

For example, in the case of Ha = 2200, Va = 1125, Hb1 = 1715, Hb2 = 1714, Vb1 = 150 and Vb2 = 375, the period of the high-resolution sync timing information is 2200 * 1125 * 1000/74.25 = 33333.33333 .

Further, the period of the low-resolution sync timing information may be (1715 * 150 + 1714 * 375) / 27 = 33333.33333 (us).

That is, the period of the sync timing information of the input image and the period of the low-resolution sync timing information generated by the low-resolution sync timing information generating unit 520 may be the same.

7 is a block diagram illustrating an image receiving apparatus according to an embodiment of the present invention.

7, an image receiving apparatus 130 according to an exemplary embodiment of the present invention may include a receiving unit 710, a clock generating unit 720, a timing correcting unit 730, and an encoding unit 740 .

The receiving unit 710 can receive the encoded image transmitted by the transmitting unit 240. For example, the receiving unit 710 may receive an encoded image through an equalizer and a deserializer. In this case, the serial-to-parallel converter can generate a low-resolution clock according to the resolution of the encoded image and transmit it to the clock generation unit 720.

The clock generating unit 720 can generate a high resolution clock using the low resolution clock received from the receiving unit 710. [

The specific configuration and operation of the clock generating unit 720 will be described below in detail with reference to FIG.

The timing correction unit 730 can correct the data timing information of the encoded image based on the low resolution clock using the high resolution clock generated by the clock generation unit 720. [

The specific configuration and operation of the timing correction unit 730 will be described below in detail with reference to FIG.

The decoding unit 740 can decode the encoded image corrected with the data timing information into a high-resolution input image.

At this time, the decoding unit 740 can extract the tag from the encoded image in which the data timing information is corrected. Then, the decoding unit 740 can decode the encoded image whose data timing information is corrected based on the compression ratio corresponding to the extracted tag.

At this time, the decoding unit 720 can decode the encoded image from the time when the tag is inserted to the time when another tag is inserted or the end of the encoded image based on the compression rate corresponding to the tag.

8 is a diagram illustrating a clock generating unit according to an embodiment of the present invention.

Referring to FIG. 8, the clock generating unit 210 according to an embodiment of the present invention may include a reference frequency generating unit 810 and a high-resolution clock generating unit 820.

The reference frequency generator 810 can generate the reference frequency by multiplying the low resolution clock received from the receiver 710. For example, the reference frequency generator 810 may multiply the low-resolution clock of 27 MHz received from the receiver 710 by 22 to generate a reference frequency of 594 MHz.

The high-resolution clock generator 820 divides the reference frequency generated by the reference frequency generator 810 to generate a high-resolution clock. For example, the high-resolution clock generating unit 820 can generate a high-resolution clock of 74.25 MHz by dividing the reference frequency of 594 MHz by eight. Also, the high-resolution clock generating unit 820 may divide the reference frequency of 594 MHz by four to generate a high-resolution clock of 148.5 MHz.

9 is a timing correction unit according to an embodiment of the present invention.

9, a timing correction unit 930 according to an exemplary embodiment of the present invention may include a control unit 510, a high-resolution sync timing generation unit 920, and a timing information correction unit 930. Referring to FIG.

The control unit 910 may generate a control signal corresponding to the encoded image according to the sync timing information of the encoded image. At this time, the control signal may write an encoded image to the timing information correction unit 930 and operate the high-resolution sync timing generation unit 920. [ Also, the sync timing information of the encoded image may be the low-resolution sync timing information generated by the low-resolution sync timing correction unit 520. [

The high-resolution sync timing generation unit 820 can generate high-resolution sync timing information using the high-resolution clock and the sync timing information of the encoded image. At this time, the high-resolution sync timing information may be sync information corresponding to the HD timing which is the timing of the high-resolution image.

At this time, the high-resolution sync timing information generator 920 can generate the high-resolution sync timing information so that it has the same period as the period of the sync timing information of the encoded image.

The high-resolution sync timing generation unit 920 may transmit the high-resolution sync timing information and the control signal generated in the timing information correction unit 930 to allow the timing correction unit 930 to output a corrected encoded image have. At this time, the encoded image output by the timing correction unit 930 may be an encoded image whose data timing is corrected according to the HD class image.

The timing information correcting unit 930 can correct the clock domain of the data timing information of the encoded video using the high-resolution sync timing information received from the high-resolution sync timing generating unit 920. [ For example, the timing information correction unit 930 may be a Dual-Port SRAM (DPSRAM) or a Frame Buffer.

10 is a flowchart illustrating an image transmission method according to an embodiment of the present invention.

In operation 1010, the encoding unit 220 may generate an encoded image by encoding the input image. At this time, the size of the encoded image may be the size of the SD-level low resolution image.

In step 1020, the timing correction unit 230 can generate the low-resolution sync timing information using the low-resolution clock and the sync timing information of the input image. At this time, the low resolution sync timing information may be sync information corresponding to the SD timing which is the timing of the low resolution image.

In step 1030, the timing correction unit 230 may correct the clock domain of the data timing information of the encoded image generated in step 1010 using the low-resolution sync timing information generated in step 1020. [ At this time, the timing correction unit 230 may correct the data timing information of the input image to be optimized to the SD-level image.

In step 1040, the transmitting unit 240 may transmit the encoded image corrected with the data timing information in step 1030 using the low-resolution sync information generated in step 1020. [

At this time, the transmission unit 240 can transmit the encoded image through a serializer and a cable driver.

11 is a flowchart illustrating an image encoding method according to an embodiment of the present invention. Steps 1110 to 1170 shown in FIG. 11 may be included in step 1010 shown in FIG.

In operation 1110, the compression unit 410 may generate an encoded image by encoding an input image using a still image transmission codec.

At this time, the compression unit 410 receives the compression ratio of the still image transmission codec from the compression rate determination unit 430, and encodes the input image according to the received compression rate.

For example, when starting to encode an input image, the compression unit 410 may receive a default compression rate from the compression rate determination unit 430. [ The compression unit 410 may encode the input image according to the default compression ratio.

In step 1120, the viewpoint determining unit 420 may determine whether it is necessary to change the compression rate of the still image transmission codec based on the size of the encoded image encoded in step 1110.

For example, when the size of the encoded image encoded in step 1120 increases to a value equal to or larger than the first threshold value or decreases to a value less than or equal to the second threshold value, the viewpoint determining unit 420 determines that the compression rate needs to be changed .

If it is not necessary to change the compression rate of the still image transmission codec, the timing determining unit 420 may cause the hatching unit 210 to perform step 1110. [

In step 1130, the compression rate determination unit 430 may determine the compression rate optimized for the input image based on the size of the encoded image at the point in time when the view determination unit 420 determines that the compression rate change is required, in step 1120.

For example, in step 1120, when the size of the encoded image at the time when the view determining unit 420 determines that the compression rate is required to be changed is greater than or equal to the first threshold value, the compression rate determining unit 430 may increase the compression rate.

If the size of the coded image at the time when the view determining unit 420 determines that the compression rate is required to be changed is equal to or less than the second threshold value in step 1120, the compression rate determining unit 430 may reduce the compression rate.

In step 1140, the viewpoint determining unit 420 may insert a tag corresponding to the compression ratio determined in step 1130 into the encoded image. For example, if it is determined in step 1130 that the compression rate is to be increased, the viewpoint determination unit 420 may insert a tag including a value for which the compression rate increases in the encoded image. In addition, the viewpoint determining unit 420 may insert a tag including a value of the compression ratio determined in step 1130 into the encoded image.

In step 1150, the compression unit 410 may change the compression rate of the still image transmission codec according to the compression ratio determined in step 1130.

The compression unit 410 may encode the input image after the point in time at which the point-in-time determination unit 420 determines that the compression rate change is necessary in step 1120, using the changed compression rate in step 1150. [

In step 1170, the viewpoint determining unit 420 may determine whether the encoding of the input image is completed. If the encoding of the input image is not completed, the viewpoint determining unit 420 may perform step 1120 to check whether or not the compression rate is required to be changed.

12 is a flowchart illustrating a video receiving method according to an embodiment of the present invention.

In step 1210, the receiving unit 710 may receive the encoded image transmitted by the transmitting unit 240. At this time, the receiving unit 710 may generate a low-resolution clock according to the resolution of the encoded image and transmit the low-resolution clock to the clock generating unit 720. Also, the clock generating unit 720 can generate a high-resolution clock using the low-resolution clock received from the receiving unit 710.

In step 1220, the timing correction unit 730 may generate high-resolution sync timing information using the high-resolution clock generated in step 1210 and the sync timing information of the encoded image. At this time, the high-resolution sync timing information may be sync information corresponding to the HD timing which is the timing of the high-resolution image.

In step 1230, the timing correction unit 730 can correct the clock domain of the data timing information of the encoded image received in step 1210 using the high-resolution sync timing information generated in step 1220. [

In step 1240, the decoding unit 740 may decode the encoded image whose data timing information is corrected in step 1230 into a high-resolution input image.

At this time, the decoding unit 740 can extract the tag from the encoded image in which the data timing information is corrected. Then, the decoding unit 740 can decode the encoded image whose data timing information is corrected based on the compression ratio corresponding to the extracted tag.

13 is a flowchart illustrating a video decoding method according to an embodiment of the present invention. Steps 1310 to 1350 shown in FIG. 13 may be included in step 1240 shown in FIG.

In step 1310, the decoding unit 740 may extract the tag by analyzing the encoded image in which the data timing information is corrected in step 1230.

In step 1320, the decryption unit 740 may identify the compression rate corresponding to the tag extracted in step 1310.

In step 1330, the decoding unit 740 may decode the encoded image whose data timing information is corrected in step 1230 using the compression rate identified in step 1320. [

 In step 1340, the decoding unit 740 can check whether or not the tag extracting unit 710 has further extracted another tag.

If another tag is extracted, since the compression rate may be changed, the decoding unit 740 may perform step 1320 to identify the compression rate corresponding to another tag.

If another tag is not extracted, the decoding unit 740 may repeat step 1330 until another tag is extracted or the decoding of the encoded image is completed.

In step 1350, the decoding unit 740 can check whether or not decoding of all the encoded images is completed. If the decoding of the bitstream is not completed, the decoding unit 740 can repeat the step 1330 until the decoding of the encoded image is completed.

The present invention can increase the transmission distance for transmitting a high resolution image by reducing the size of the high resolution image by encoding the low resolution image when the input image is transmitted and correcting the timing information of the input image to the low resolution image.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. This is possible.

The method according to an embodiment of the present invention may be implemented in the form of a program command that can be executed through various computer means and recorded in a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, and the like, alone or in combination. The program instructions to be recorded on the medium may be those specially designed and configured for the embodiments or may be available to those skilled in the art of computer software. Examples of computer-readable media include magnetic media such as hard disks, floppy disks and magnetic tape; optical media such as CD-ROMs and DVDs; magnetic media such as floppy disks; Magneto-optical media, and hardware devices specifically configured to store and execute program instructions such as ROM, RAM, flash memory, and the like. Examples of program instructions include machine language code such as those produced by a compiler, as well as high-level language code that can be executed by a computer using an interpreter or the like. The hardware devices described above may be configured to operate as one or more software modules to perform the operations of the embodiments, and vice versa.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. For example, it is to be understood that the techniques described may be performed in a different order than the described methods, and / or that components of the described systems, structures, devices, circuits, Lt; / RTI > or equivalents, even if it is replaced or replaced.

Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined by the equivalents of the claims, as well as the claims.

120: Image transmission device
130: Video receiving device
210: clock generating unit
220:
230: timing correction unit

Claims (19)

A clock generating unit for generating a high resolution clock corresponding to a high resolution image by demultiplexing a reference frequency and dividing the reference frequency into a value larger than a frequency division for generating a high resolution clock to generate a low resolution clock;
An encoding unit for encoding an input image generated based on the high resolution clock to generate an encoded image; And
And a timing correction unit for correcting data timing information of the encoded image using the low-
And transmitting the image data. delete The method according to claim 1,
Wherein the timing compensator comprises:
A low-resolution sync timing information generating unit for generating low-resolution sync timing information using the low-resolution clock and the sync timing information of the input image; And
A timing information corrector for correcting the clock domain of the data timing information of the encoded image using the low resolution sync timing information,
And transmitting the image data. The method of claim 3,
And a transmission unit for transmitting the encoded image, the data timing information of which is corrected using the low-resolution sync information,
Further comprising: The method of claim 3,
Wherein the low-resolution sync timing information generating unit comprises:
And generates low-resolution sync timing information so as to have the same period as the period of the sync timing information of the input image. A clock generating unit for generating a high resolution clock using a low resolution clock;
A timing correcting unit correcting data timing information of an encoded image based on the low resolution clock using the high resolution clock; And
A decoding unit for decoding the encoded image whose data timing information is corrected into an input image of high resolution,
Lt; / RTI >
Wherein the timing compensator comprises:
A high-resolution sync timing information generator for generating high-resolution sync timing information using the high-resolution clock and the sync timing information of the encoded image; And
A timing information corrector for correcting the clock domain of the data timing information of the encoded image using the high-resolution sync timing information,
And an image pickup device. The method according to claim 6,
Wherein the clock generating unit comprises:
A reference frequency generator for multiplying a low resolution clock to generate a reference frequency; And
A high-resolution clock generating unit for generating a high-resolution clock by demultiplexing the reference frequency,
And an image pickup device. delete The method according to claim 6,
Wherein the high-resolution sync timing information generating unit comprises:
And generates high-resolution sync timing information so as to have the same period as the period of the sync timing information of the encoded video. Generating a high resolution clock corresponding to the high resolution image by demultiplexing the reference frequency and generating a low resolution clock by dividing the reference frequency by a value larger than a division for generating a high resolution clock;
Generating an encoded image by encoding an input image generated based on the high resolution clock; And
Correcting data timing information of the encoded image using the low resolution clock
The method comprising the steps of: delete 11. The method of claim 10,
Wherein the step of correcting the timing information comprises:
Generating low resolution sync timing information using the low resolution clock and the sync timing information of the input image;
Correcting a clock domain of data timing information of the encoded image using low-resolution sync timing information
The method comprising the steps of: 13. The method of claim 12,
And transmitting the encoded image with the corrected data timing information using the low-resolution sync information
Further comprising the steps of: 13. The method of claim 12,
Wherein the generating the low-resolution sync timing information comprises:
And generates low-resolution sync timing information so as to have the same period as the period of the sync timing information of the input image. Generating a high resolution clock using a low resolution clock;
Correcting data timing information of an encoded image based on the low resolution clock using the high resolution clock; And
Decoding the coded image with the data timing information corrected into a high-resolution input image
Lt; / RTI >
Wherein the step of correcting the timing information comprises:
Generating high-resolution sync timing information using the high-resolution clock and the sync timing information of the encoded image; And
Correcting a clock domain of data timing information of the encoded image using high-resolution sync timing information
And transmitting the image data. 16. The method of claim 15,
The step of generating the clock includes:
Multiplying the low resolution clock to generate a reference frequency; And
Generating a high-resolution clock by demultiplexing the reference frequency;
And transmitting the image data. delete 16. The method of claim 15,
Wherein the generating the high-resolution sync timing information comprises:
And generating high-resolution sync timing information so that the period has the same period as the period of the sync timing information of the encoded image. A computer-readable recording medium on which a program for executing the method of any one of claims 10, 12 to 16, and 18 is recorded.

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