KR100211839B1 - High efficiency image transmitting method for digital camcorder - Google Patents

Abstract

end. TECHNICAL FIELD The present invention relates to a digital video camcorder, and more particularly, to an apparatus for outputting a moving image by continuously transmitting a small amount of data to a personal computer in a reduced form of a video of a digital video camcorder. It is about.

I. The technical problem to be solved by the invention: In the conventional method of transmitting the video / audio data by connecting the digital video camcorder and the computer by the RS232C transmission method has a limitation in the transmission speed, the personal video when real-time video transmission from the actual digital video camcorder It takes about 1, 2 minutes to watch a video on a computer, which solves the problem that real time transmission was impossible.

All. SUMMARY OF THE INVENTION The present invention provides a high efficiency image transmission method in a digital video camcorder connecting a personal computer and a transmission line. A first step of transmitting a reduced screen sampled at an interval of 4 pixels from the full screen during every frame period and digitally processed image data input from the outside; and transmitting the reduced screen to the first step while requesting a full screen transmission from the user And a second step of transmitting a full screen for four frame periods when a signal is present.

la. Significant use of the invention: A method for high efficiency transmission of images in a digital video camcorder.

Description

High-efficiency picture transfer from digital video camcorders

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital video camcorder, and more particularly, to a method of outputting moving images by continuously transmitting only a small amount of data to a personal computer in a reduced form of a moving image of a digital video camcorder.

In general, digital video camcorders have a higher resolution than digital cameras, and thus are devices for recording moving images, and thus have excellent merchandise having a function of transferring the images to a personal computer and editing the image data. As such, communication with the personal computer is generally more convenient to manufacture and use than serial transmission, so the system is operated with the block configuration of the digital video camcorder as shown in FIG. 1 is a block diagram of a moving picture transmission system connecting a conventional digital video camcorder and a personal computer. Referring to FIG. 1, the camera unit 10 captures image information from the outside, so that Y (luminance): Cr (color difference signal = RY): Cb (color difference signal = BY) = 4: 2 : Outputs data in two formats. The decimation unit 20 digitizes the Y: Cr: Cb = 4: 2: 2 format data output from the camera unit 10 in a Y: Cr: Cb = 4: 1: 1 format. . The shuffle memory 40 mixes input Y: Cr: Cb = 4: 1: 1 format data to increase the compression efficiency of the subsequent compression / extension unit 50. The compression / decompression unit 50 receives the shuffling data output from the shuffle memory 40 and compresses it to be stored in the recording / reproducing unit 60 at a later stage, and recorded in the recording / reproducing unit 60. The compressed data is stretched to the original data size for reading and playing back. The recording / reproducing unit 60 receives and records the compressed data from the compression / decompression unit 50 and reproduces the recorded data. The I-desertion unit 30 outputs Y: Cr: Cb = 4: 1: 1 format shuffling data output from the shuffle memory 40 to the view-finder 120 attached to the camcorder. Restore again to the: Cr: Cb = 4: 2: 2 format. The D / A converter 70 outputs Y: Cr: Cb = 4: 2: 2 format data output from the I-desertion unit 30 to the outside through the rear view-pinter 120. To do this, the digitally processed data is converted into analog data, which is an original signal, and output. The view-finder 120 outputs the analog signal converted and output through the D / A converter 70 to the outside. The capture control unit 80 samples and outputs data at predetermined intervals in order to transfer the shuffling data output from the shuffle memory 40 to the personal computer 110. The memory unit 100 has a form of a dual port RAM to temporarily store data output from the capture controller 80, and output the temporarily stored data under the control of a transmission controller 90 at a later stage. do. The transmission control unit 90 connects the personal computer 110 and the RS232C transmission line and stores the temporarily stored data in the memory unit 100. The personal computer 110 receives data output from the transmission control unit 90 of the digital video camcorder system and outputs the data externally through its own monitor.

However, as described above, the conventional method of transmitting video / audio data by connecting a digital video camcorder and a computer by using a RS232C transmission method has a limitation in transmission speed, so when moving a moving picture from a real digital video camcorder in real time, a video is transferred to a personal computer. It took about 1 to 2 minutes to see the problem that the real-time transmission was impossible.

Therefore, in order to solve the above problems, a method of compressing and transmitting data in a digital video camcorder is used. However, such a method also takes a long time to decompress in a personal computer, and the cost of the compression transmission system itself is also expensive, there is a problem of low profitability.

Accordingly, an object of the present invention relates to a method for outputting a moving image by continuously transmitting only a small amount of data to a personal computer in a reduced form of a moving image of a digital video camcorder.

The present invention for achieving the above object is a high efficiency image transmission method in a digital video camcorder connecting a personal computer and a transmission line;

A first step of transmitting a reduced screen sampled at an interval of 4 pixels from the full screen during every frame period and digitally processed image data input from the outside; and transmitting the reduced screen to the first step while requesting a full screen transmission from the user When there is a signal, the second step of transmitting the entire screen for four frame periods is characterized in that it is performed.

1 is a block diagram of a moving picture transmission system connecting a conventional digital video camcorder and a personal computer.

2 is a block diagram of a moving picture transmission system connecting a digital video camcorder and a personal computer according to an embodiment of the present invention.

3 is a flowchart of a screen transmission control according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals have the same reference numerals as much as possible even if displayed on different drawings. In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

2 is a block diagram of a moving picture transmission system connecting a digital video camcorder and a personal computer according to an embodiment of the present invention. Referring to FIG. 2, first, the configuration of the entire system is the same as that described in FIG. 1, but the capture controller 200 and the entire controller 220 controlling the transmission controller 210 have different transmission schemes. Therefore, the capture controller 200 temporarily stores 18 MHz data output from the shuffle memory 40 at four pixel intervals for one frame period under the control of the entire controller and temporarily stores the 18 MHz data in the memory unit 100. The transmission control unit 210 reads the data temporarily stored in the memory unit 100 and transmits the data at a transmission rate of 36 Mbps to enable real-time moving image processing of the personal computer to the size of 1/16 of the original screen.

Therefore, when the operation of the present invention is described in detail through the block of FIG. And, when transmitting to the personal computer 110 at a transmission rate of 36Mbps can be delivered for a period of 4 frames in time. Therefore, when a moving picture is to be transmitted to the personal computer 110 for viewing, the screen should be reduced in size. In this case, since the color difference signals Cr and Cb are always required for the four Y (luminance) signals to transmit the reduced screen, the amount of data to be transmitted is the actual screen data amount even if the pixel of the image data to be transmitted is spaced. It is not reduced to 1 / (pixel interval of image data). Therefore, as in Equation 1 below, in the case of two pixel intervals, the amount of data to be transmitted corresponds to one third of the original image data amount. Then, the following Equation 1 shows the amount of transmission data in each interval.

[Equation 1]

In this case, the values of the intervals in Equation 1 mean 720 and 480 are aspect ratios of the screen, 1.5 are components of Y, Cr, and Cb in the first 1/1 interval, and 4 is the number of clocks required for transmission. In the second half interval, 360 and 240 are aspect ratios of the screen, 2 is a component of Y, Cr, and Cb, and 4 is the number of clocks required for transmission. The numerical values of the respective intervals of 1/3 to 1/8 also have the same meaning as described above.

Therefore, if you transfer the data sampled at 4 pixel intervals in one frame period, Y: Cr: Cb = 180: 180: 180 in the 1H section, and transfer it again in the 4H interval, so the total amount of data ((180+ 180 + 180) × 120 × 8) is 518,400 bits (64,800 bytes). In the end, when transmitting at 36Mbps, it is possible to transmit and display continuously in 1/16 size of original screen.

Therefore, the present invention transmits a frame period every frame continuously in Y: Cr: Cb = 1: 1: 1 for every fourth pixel of odd H when transmitting a reduced picture, and the transmission of the full screen is performed in a four frame period. Send the first frame period every Y: Cr: Cb = 1: 1: 1 for every fourth pixel of odd H, and the second frame period every Y: Cr: Cb = 1: 1 for every fourth pixel of even H Transmits 1 as the first frame period, the frame period is Y = 3 to the second, third, and fourth pixels of odd-numbered H, and the fourth frame period is the frame period as 2,3,4 of even-numbered H. Send Y = 3 to the first pixel.

Next, the method of the above-described data reduction transmission method will be described in detail with reference to the flowchart of FIG. 3. 3 is a flowchart of a screen transmission control according to an embodiment of the present invention. Referring to FIG. 3, in operation 300, the entire controller 220 controls the capture controller 200 to sample the data output from the shuffle memory unit 40 at 4 MHz intervals of 18 MHz. After the temporary storage, the transmission control unit 210 is controlled to transmit the temporarily stored data to the RS232C transmission line connected to the personal computer 110 at a transmission speed of 36 Mbps. In this case, the transmitted screen transmits a reduced screen, and continuously transmits a frame period every four frames of odd-numbered H as Y: Cr: Cb = 1: 1: 1. Then, during the data transmission as described above, the overall control unit 220 performs step 310 to detect whether the transmission request signal of the full screen is input from the user. In this case, when the transmission request signal of the full screen is input from the user, in step 320, the overall controller 220 controls the capture controller 200 to output data output from the shuffle memory unit 40 over a four frame period. Samples are temporarily stored in the memory unit 100, and the transmission control unit 210 controls the RS232C transmission line connected to the personal computer unit 110 to transfer the temporarily stored full screen data of the four frame periods to a transmission rate of 36 Mbps. To be sent to. In this case, the full-screen data is transmitted in a total of 4 frames, and the first frame period is transmitted as Y: Cr: Cb = 1: 1: 1 every 4th pixel of odd-numbered H, and the second frame is transmitted. Transmit the period as Y: Cr: Cb = 1: 1: 1 for every fourth pixel of even-numbered H, and transfer Y = 3 to the second, third, and fourth pixels of odd-numbered H for the third frame period. In the fourth frame period, Y = 3 is transmitted to the second, third, and fourth pixels of even-numbered H.

However, when the transmission request signal of the full screen is not input from the user in step 310, the overall control unit 220 continues to transmit the above-mentioned reduced screen by performing step 330. Then, in step 340, the overall control unit 220 detects the transmission termination signal from the user, and terminates the program when the transmission termination is detected.

By providing a method of continuously transmitting only a small amount of data to a personal computer in a reduced form of a video of a digital video camcorder as described above, there is an advantage in that a real-time moving picture can be output from the personal computer.

Claims (4)

In a high efficiency image transmission method in a digital video camcorder connecting a personal computer and a transmission line, A first step of transmitting a reduced image obtained by sampling the image data input from the outside and digitally processed at every four pixel intervals during the entire frame period; And a second step of transmitting a full screen for four frame periods when a full screen transmission request signal is received from a user during the transmission of the reduced screen in the first step. The method of claim 1, And transmitting a ratio of Y: Cr: Cb in a ratio of 1: 1: 1 for every fourth pixel for odd-numbered horizontals during a period of one frame in the first step. The method of claim 1, In the second step, the transmission of the full screen during the period of 4 frames transmits a ratio of Y: Cr: Cb in a ratio of 1: 1: 1 for every fourth pixel of the odd horizontal number in the first frame, and even number in the second frame. Transmit Y: Cr: Cb at a ratio of 1: 1: 1 for every fourth pixel of the first horizontal, and transmit Y = 3 to the second, third, and fourth pixels for the odd-numbered horizontals in the third frame. A high-efficiency image transmission method in a digital video camcorder characterized by transmitting Y = 3 to the second, third, and fourth pixels of an even number in the first frame. In a high efficiency image transmission method in a digital video camcorder connecting a personal computer and a transmission line, Digitally processed image data input from the outside is transferred at a ratio of 1: 1: 1 for every 4th pixel of odd-numbered horizontal pixels for 1 frame period, and then is reduced in the same way for every frame period. The first step of transmitting the; In the first step of transmitting the reduced screen, when the user receives a full screen transmission request signal, a second step of transmitting a full screen for four frame periods shown below is performed. . First frame: transmits Y: Cr: Cb = 1: 1: 1 every fourth pixel for odd-numbered horizontals Second frame: transmits Y: Cr: Cb = 1: 1: 1 every fourth pixel for even numbered horizontals 3rd frame: Send Y = 3 to 2nd, 3rd, 4th pixel for odd horizontal Fourth frame: Send Y = 3 to the second, third, and fourth pixels for even-numbered horizontals