KR100576015B1 - Method and apparatus for correcting image data - Google Patents

Abstract

According to the present invention, in image data correction, a plurality of blocks are classified according to a preset reference on a frame-by-frame basis for image data to be recorded to generate information on an absolute position value in a corresponding frame of each block, and Information is recorded together when the corresponding video data is recorded, and a portion where an error occurs in an image reproduced frame by frame is reproduced when the recorded image data and the information on the absolute position value are reproduced, and the error in the image frame occurs. The portion corresponding to the absolute position value of the portion is replaced with the portion of the previous frame corresponding to the same absolute position value.

Image, record, playback, error, correction

Description

Image data correction device and method {METHOD AND APPARATUS FOR CORRECTING IMAGE DATA}             

1 is a schematic block diagram of an apparatus for correcting recorded image data according to an embodiment of the present invention;

2 is a schematic block diagram of an apparatus for correcting playback image data according to an embodiment of the present invention;

FIG. 3 is a diagram illustrating a mapping between playback image data and a memory of FIG. 2; FIG.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to video signal processing techniques, and more particularly, to an apparatus and method for correcting an error portion in recording and reproducing video signals.

When using an apparatus for digitally processing an image signal and recording it on a recording medium, it may be difficult to reproduce a perfect image due to the deterioration of the recording medium. This is especially true when performing special functions such as search.

The search function, which is often used in VCRs or camcorders, operates on the system by special operations instead of normal playback functions. In other words, instead of reproducing a single piece of image data normally, only a part of the image data is reproduced. Therefore, a part of the image of a portion that cannot be reproduced is composed of a screen that is not visually significant. do. In this case, the screen is broken when the screen is played.

In particular, when the recording medium is a magnetic tape, it can be used to record image information using a product such as a VCR or a camcorder. The recording medium is perfectly recorded on a product having mechanical characteristics such as magnetic tape and deck. Many difficulties arise in playing back video signals.

 Accordingly, an object of the present invention is to provide a method and apparatus for correcting video data in which video signal processing is performed so as to recover as much as possible during reproduction in consideration of characteristics of a medium in recording video signals.

It is another object of the present invention to provide an apparatus and method for correcting image data that can be restored to the maximum when the image signal is reproduced.

In order to achieve the above object, according to the present invention, in the image data correction, the image data to be recorded is divided into a plurality of blocks according to a preset reference in units of frames to generate information on an absolute position value in a corresponding frame of each block. And recording the information on the absolute position value together when recording the corresponding image data, detecting a portion in which an error occurs in the image reproduced in units of frames when the recorded image data and the information on the absolute position value are reproduced. The portion corresponding to the absolute position value of the portion in which the error occurs in the frame is replaced with the portion of the previous frame corresponding to the same absolute position value.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, specific details such as specific components are shown, which are provided to help a more general understanding of the present invention, and it is understood that these specific details may be changed or changed within the scope of the present invention. It is self-evident to those of ordinary knowledge in Esau.

1 is a schematic block diagram of an essential part of a recording image data correcting apparatus according to an embodiment of the present invention. Referring to FIG. 1, the apparatus for correcting recorded image data according to the present invention includes a record image signal processor 10 for processing an input image as a record image signal, an absolute position generator 12, and a channel unit 14. do.

At this time, the characteristic technique of the present invention used in the recording mode is the absolute position generator 12 block. The recorded image signal processing unit 10 may use various image processing techniques that are conventionally used. For example, if signal processing is performed using MPEG2, the compressed video signal will be recorded. In this case, not only data but various signals are generated in the compressed video signal. At this time, the signal C generated by the recording image signal processing unit 10 becomes pure image data, and the signal A refers to an end-of-block signal as a control signal generated during the compression process. The signal A is a signal indicating a unit of image processing in the process of performing image signal processing even if another image retrieval algorithm is used.

Using the signal, the absolute position generator 12 may encode which position of the screen the signal C is. For example, if a 720x480 screen is processed, horizontally divided by X and vertically divided by Y, it is added to the signal C in a specific A block and transmitted to the channel. At this time, what should be considered is how much the X and Y should be divided. If the screen is finely divided, the amount of pure video data is recorded less, and if it is sparsely divided, the restoration unit increases during playback, thereby reducing the effect of correction. Therefore, the screen should be properly classified and recorded according to the characteristics of the system.

The horizontal value X and the vertical value Y (indicated by the signal B in FIG. 1) made by the absolute position generator 12 are combined with the signal C, which is a pure video signal generated by the recording image signal processor 10, as a signal D. Is sent to the unit 14. Therefore, the signal D is composed of pure image data and data indicating the position of a specific block of the image.

2 is a schematic block diagram of an apparatus for correcting playback image data according to an embodiment of the present invention. Referring to FIG. 2, the data transmitted from the channel unit 24 is input to the absolute position detecting unit 22 when the image data is reproduced in the apparatus for correcting reproduced image data according to the present invention. The absolute position detection unit 22 detects the absolute position data (ie, the horizontal value X and the vertical value Y) of the image from the data transmitted from the channel unit 24. The signal E, which is pure image data, is transmitted to the reproduced video signal processor 20 by distinguishing pure image data and data indicating a specific block position of the image from the data. Send to 26.

The reproduced video signal processor 20 functions to detect errors while decoding pure video data. When the error is found in the encoding process, the decoded data signal F and the error flag signal G are generated and transmitted to the memory unit 26.

The memory unit 26 performs memory control by using the signal H transmitted from the absolute position detector 22 and the signals F and G transmitted from the reproduced video signal processing 20. In the process of recording the signal F, which is the decoded image data in the memory, a memory address must be generated. The reference for generating the address is to generate and generate the absolute position value of the image, which is the signal H provided from the absolute position detector 22. do. In addition, the signal G is used to prevent error data from being written into the memory.

In more detail, the operation of the image is divided into 16 horizontally and 4 vertically. That is, when recording is divided into X = 16 and Y = 4, the X value and the Y value are encoded and transmitted to the memory unit 26 during reproduction. This X. Y value is generated to generate an address, and only an address corresponding to the decoded X and Y values in the normal playback operation or the search operation will be generated. Therefore, since the addresses corresponding to the undecoded X and Y addresses are not generated, the current image data is not recorded in the memory. Thus, the data on the phone remains intact.

That is, the search function may be performed by displaying a screen of all images on the part of the image not generated from the tape due to the search function.

In addition, when an error occurs due to a bad tape, an error flag is generated, and since the memory address is not generated using the error flag, the image data having an error on the portion is not recorded in the memory. Therefore, the errored image has the effect of replacing the data of all the images.

By adding such a function, it becomes possible to recover an image as much as possible in the case of an uncertain situation occurring when the recording medium is a magnetic tape. Of course, perfect recovery is difficult, but visually burdensome images are possible.

FIG. 3 is a diagram illustrating a mapping between the playback image data and the memory of FIG. 2. Referring to FIG. 3, the image frame 30 according to the pure image signal F output from the reproduced image signal processing unit 20 is stored in a one-to-one mapping to the memory 32 of the memory unit 26 according to X and Y values. In this case, when an errored defective portion 34 is generated, the reproduction video signal processing unit 20 generates an error flag signal G when the defective portion 34 is generated. Since the image of the memory area 36 of the defective portion 34 is not recorded, the image of the frame previously recorded remains in the memory area 36. In general, the video between adjacent frames is particularly similar in the video, so that even if a portion of the video frame in which the error occurs is replaced with the image of the previous frame, the error portion may be visually appropriately compensated.

By the above configuration, the image data correction according to the features of the present invention can be made.

Meanwhile, in the above description of the present invention, specific embodiments have been described, but various modifications may be made without departing from the scope of the present invention. In particular, in the above description, the recording and reproducing apparatus of the image data is separately configured with reference to FIGS. 1 and 2, but the recording and reproducing apparatus of the image data illustrated in FIGS. 1 and 2 is partially or wholly in hardware. The same block may be used differently in recording and reproducing. Therefore, the scope of the present invention should not be defined by the described embodiments, but by the equivalents of the claims and claims.

As described above, in the present invention, the video signal processing is performed so that the video signal can be reconstructed as much as possible in consideration of the characteristics of the medium.

Claims (2)

In the video data correction method, Generating information about an absolute position value in a corresponding frame of each block by dividing a plurality of blocks according to a preset criterion for image data to be recorded on a frame basis; Recording the information on the absolute position value together with the recording of the corresponding image data; Detecting a portion in which an error occurs in the image reproduced in units of frames when the recorded image data and the information on the absolute position value are reproduced; And replacing the portion corresponding to the absolute position value of the portion in which the error occurs in the image frame with the portion of the previous frame corresponding to the same absolute position value. In the image data correction device, A recorded video signal processor for compressing and outputting a recorded video signal and outputting a signal of an image processing unit; By using the signal of the image processing unit output from the recording image signal processing unit, the screen is divided into horizontal and vertical preset positions and outputs position values for the divided blocks, so that the image frame and the position values of the corresponding frames are simultaneously recorded on the recording medium. The absolute position generating unit to be recorded, An absolute position detector for distinguishing and outputting the image data of the image from the data reproduced on the recording medium and the position value indicating the specific block position of the image; A reproduction video signal processor which detects an error while decoding pure video data and generates an error flag signal when an error is detected; An address generation criterion for receiving the position value outputted from the absolute position detector and recording the reproduced image data outputted from the reproduced image signal processing unit into a memory, and does not record the data of the position value at which the error flag is generated in the memory. And a memory unit for performing a non-operating operation.

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