KR20030043450A - apparatus and method for transmission/display of MPEG2 digital image using ICC profile - Google Patents

Abstract

PURPOSE: A system and method for transmitting/reproducing an MPEG-2 digital image using ICC profile are provided to allow a display device to perform color correction using color information of an input device. CONSTITUTION: An MPEG-2 digital image transmitting system includes a camera image input unit(110) for photographing an actual image and converting the image into a video signal, an MPEG-2 video compressor(120) for compressing the video signal into an MPEG-2 image, and an ICC profile generator(130) for receiving characteristic information of the camera to generate ICC profile. The system further includes a stream synthesizer(140) for synthesizing the compressed video signal and the ICC profile into one stream signal, and a transmitter(150) for transmitting the stream signal through a network.

Description

Apparatus and method for transmission / display of MPEG2 digital image using ICC profile}

The present invention relates to a device for transmitting and reproducing MPEG2 digital video using an international color consortium (ICC) profile and a method thereof, which can be expressed by a viewer watching a digital TV in a studio and guarantee high quality color images. The present invention relates to an MPEG2 digital image transmission / playback apparatus using an ICC profile and a method thereof.

When transmitting a color image using a wired or wireless network, and receiving the transmitted color image and reproducing the color image, it is an important problem in the field of color imaging apparatus to match the color of the image with the color of the far-field image.

Korean Patent Registration No. 252993 (Invention name: TV brightness and contrast correction method, date of registration January 21, 2000) uses the histogram information of the input frame screen to extract the characteristics of the screen, A technique for correcting the brightness and contrast of a TV is proposed by applying a method suitable for the extracted feature.

That is, the histogram distribution information of the frame screen is extracted from the input luminance signal and the synchronization signal, the distribution information of the frame screen is received, and the characteristics of the distribution of the screen are input. After selecting one shape, luminance and contrast correction corresponding to the selected correction type is performed.

However, this prior patent has a disadvantage in that processing time is long and a large amount of calculation is required when extracting histogram distribution information because the histogram information is extracted from analog TV and digital TV, thereby improving image quality. In addition, there is a disadvantage in that it does not achieve accurate color reproduction as a result of the correction, and increases the difference between the actual image taken by the camera and the display from the TV.

On the other hand, Korean Patent Registration No. 278642 (name of the invention: a color image processing apparatus and method, registered date: 2000.10.21) seeks to correct the color image by extracting the illumination color.

That is, after buffering and outputting the inputted first RGB signal, the second RGB signal is output by down-sampling the first RGB signal, and the second RGB signal is output in a standard color space for predetermined N different illumination colors. The light source is converted into a predefined reference light source, converted into a third RGB signal of N × M type according to the predetermined M representative color temperature information of the display means, and the third RGB signal is buffered and output. Color information or symbolic color images can be selected and produced without information.

However, this prior patent has a disadvantage in that the processing in the process of obtaining the illumination color is complicated and the calculation amount is large. In addition, image data conversion may be wrong due to the wrong extraction of color generated during processing, and there is a disadvantage that accurate color reproduction is impossible. It is also difficult to use in digital TV that is shown in real time.

In addition, the conventional image correction method was only possible to adjust the brightness, brightness, saturation, the correction through this was only possible to manually adjust the image according to the preference of the individual. This function alone does not satisfy the accuracy of the viewers actual image.

The present invention has been made to solve such a conventional problem, by embedding the color information based on the ICC profile in the digital TV in the input device, ICC performing color correction using the color information of the input device in the display device An object of the present invention is to provide an MPEG2 digital video transmission / playback apparatus using the profile and a method thereof.

1 is an overall block diagram of an MPEG2 digital video transmission / reproduction apparatus using an ICC profile according to the present invention.

FIG. 2 is a block diagram illustrating an internal configuration of the ICC profile generator of FIG. 1. FIG.

3 is a block diagram illustrating an internal configuration of the ICC profile detection graft of FIG. 1.

4 is a video processing flowchart of the MPEG2 digital video transmission apparatus using the ICC profile according to the present invention.

5 is a video processing flowchart of the MPEG2 digital video reproducing apparatus using the ICC profile according to the present invention.

* Description of the symbols for the main parts of the drawings *

100: digital broadcast transmission device 110: camera image input unit

120: MPEG2 video compression unit 130: ICC profile generation unit

131: camera information input unit 132: profile generation processor

133: memory unit 134: stream generator

140: stream grafting unit 150: transmission unit

200: digital broadcast playback device 210: stream separation unit

220: MPEG2 decoding unit 230: video processing unit

240: ICC profile detection unit 241: ICC profile detection unit

242: memory unit 243: profile application unit

244 color calculation unit

According to one aspect of the MPEG2 digital video transmission method using the ICC profile according to the present invention for achieving this object, in the video transmission method, the step of capturing the actual image and converting it into a video signal, and compressing the video signal into an MPEG2 video Generating the ICC profile by receiving the characteristic information of the camera photographing the actual image, synthesizing the compressed MPEG2 video signal and the ICC profile into a single stream, and synthesizing the synthesized stream signal through a network Perform the step of transmitting. The characteristic information of the camera in the step of generating the ICC profile may include relationship information or pixel information on the actual image and the signal.

On the other hand, according to one aspect of the MPEG2 digital video playback method using the ICC profile according to the present invention, MPEG-2 digital video playback method comprising the steps of: separating the video, audio stream and ICC profile information from the stream received through the network; Decoding the video stream from the separated stream by MPEG2, signal processing the video signals of R ', G', and B 'to reproduce the MPEG2 decoded video signal, R', G ', and Applying a separate ICC profile to the video signal of B 'and converting it into a corrected video signal of R ", G ", and B ", and correcting R ", G ", and B'. And displaying an image according to the video signal of '.

In the step of converting the corrected video signal, the ICC profile of the separated stream is detected, and the detected profile is applied to a pre-stored playback device profile, and the video information processed by the video processing is used to modify the characteristics of the camera / playback device. By using the lookup table and the matrix operation to correct the corrected R '', G '', and B ''.

In the transmission apparatus of the present invention, a technique of making the characteristic information of a camera into an ICC profile, and a technique of inserting it into an MPEG2 coding part based thereon should be preceded first. Also, the reproduction apparatus adopts this technique, and a technique for real-time decoding an ICC profile, a technique applied to a display using the profile, and the like are applied.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram illustrating a broadcast transmitter of a digital TV and a broadcast reproducer of a digital TV according to the present invention. Referring to FIG. 1, the configuration and operation of a broadcast transmitter of a digital TV and a broadcast reproducer of a digital TV according to the present invention will be described.

The MPEG2 digital video transmission apparatus 100 using the ICC profile according to the present invention includes a camera video input unit 110 for capturing a real image and converting the video signal input by the camera video input unit into an MPEG2 video. An image compression unit 120, an ICC profile generation unit 130 that receives characteristic information of a camera photographing a real image, and generates an ICC profile, and an image signal and an ICC profile generation unit 130 compressed by an MPEG2 image compression unit. And a stream grafting unit 140 for synthesizing the ICC profile generated by the multi-channel stream into a single stream, and a transmission unit 150 for transmitting the stream signal synthesized by the stream grafting unit 140 through a network.

The camera image input unit 110 converts a real image into an input image signal, and the MPEG2 image compression apparatus 120 compresses the image signal input through the camera image input unit 110 by a motion compensation method and a DCT algorithm. And create a video stream. The ICC profile generator 130 generates information on the camera device of the camera image input unit 110. The stream grafting unit 140 combines the generated video stream, voice stream, and ICC profile information.

On the other hand, MPEG2 digital video playback apparatus 200 using the ICC profile according to the present invention, stream separation unit 210 for separating the video, audio stream and ICC profile information from the stream received through the network, and the stream separation unit ( MPEG2 decoding unit 220 for decoding the video stream by MPEG2 among the streams separated by 210, and R ', G', and B 'for reproducing the video signal decoded by MPEG2 decoding unit 220. The ICC profile detected by the stream separation unit 210 with respect to the video processing unit 230 for signal processing into a video signal and the video signal of R ', G', and B 'processed by the video processing unit 230 An ICC profile detection graft unit 240 for converting the applied R ", G ", and B " video signals into corrected R " and G " Display displaying an image according to the video signals of ', and B' Is configured to include a chin 250. The

The stream separator 210 separates the received stream into video, voice stream, and ICC profile information. The MPEG2 decoding unit 220 decodes the video stream by MPEG2. The video processor 230 performs video processing such as color conversion and size conversion. The ICC profile detecting unit 240 detects the ICC profile in the stream splitter and applies the ICC profile to the R ', G', and B 'video signals from the video processing apparatus to apply the RCC, R' ', G' ', and Convert to B '' video signal. The display unit 250 displays an image according to the image signals of R ″, G ″, and B ″ converted by the ICC profile detection graft unit 240.

FIG. 2 is a block diagram illustrating an internal configuration of the ICC profile generator 130 of FIG. 1. Referring to FIG. 2, the internal configuration of the ICC profile generator 130 will be described.

Referring to FIG. 2, the ICC profile generation unit 130 may generate a profile generation processor configured to generate information received through the camera information input unit 131 and the camera information input unit 131 in the form of a profile. 132, a memory unit 133 for storing a header structure part and a tag table of the ICC profile synthesized by the profile generation processor 132, and a stream generator for generating a profile stored in the memory unit 133 as a stream ( 134).

The camera information input unit 311 receives the characteristic information of the camera. The camera characteristic information may include relationship information or pixel information on the actual image and the signal.

The profile generation processor 312 generates the information received through the camera information input unit 311 in the form of a profile, and combines the header structure part of the ICC profile and the tag table stored in the memory unit 313.

The memory unit 313 stores a header structure part and a tag table of the ICC profile synthesized by the profile generation processor 312.

The stream generator 314 generates a profile generated by the profile generation processor 312 as a stream.

3 is a block diagram illustrating an internal configuration of the ICC profile detecting graft 240 of FIG. 1. Referring to FIG. 3, the internal structure of the ICC profile detection graft 240 will be described.

Referring to FIG. 3, the ICC profile detector grafting unit 240 includes an ICC profile detector 241 for detecting an ICC profile among streams separated by the stream separator 210, and a memory unit for storing a profile of a playback device ( 242, a profile application unit 243 for applying the profile detected by the ICC profile detection unit 241 to a reproduction device profile stored in the memory unit 242, and image information processed by video processing for the camera / display device. And a color calculation unit 244 for converting to R ″, G ″, and B ″ through a lookup table and a matrix operation using the characteristics of.

The ICC profile detector 241 detects only the ICC profile part by separating the ICC profile from the received stream.

The profile applying unit 243 applies the device profile stored in the memory unit 242 using the detected profile.

The color operator 244 converts the video processed video signal into R ″, G ″, and B ″ through LUT and matrix operations.

4 is a flowchart illustrating an operation of a transmitter for improving MPEG2 digital broadcast quality using an ICC profile according to the present invention. Let's look at the operation of the transmitter with reference to FIG.

First, it is determined whether the ICC profile is added (S1). If the profile is not added (S2), MPEG2 coding is performed (S2), and then a video stream is generated (S3). On the other hand, when the profile is added, the camera input information is read (S4), the profile information of the memory stored in advance is read (S5), and the input information is analyzed (S6). The camera profile is generated with respect to the analyzed information (S7). When all the camera profiles are generated, a stream grafting operation with the generated video and audio streams is performed (S8). The digital broadcast transmission operation is performed on the generated stream (S9).

5 is a flowchart illustrating an operation of a playback unit for improving MPEG2 digital broadcast quality using an ICC profile according to the present invention. Let's look at the operation of the playback unit with reference to FIG.

The reception operation of the digital broadcast is performed (S11). The input stream is analyzed (S12) to determine whether an ICC profile is added (S13). If the profile is not used, MPEG2 decoding is performed (S14) and video processing is performed (S15). (S16). On the other hand, when the profile is added (S14), the stream is separated (S14), the operation of detecting the ICC profile (S15) and the operation of reading the device profile from the memory unit (S16) in the case of the camera and the device received the profile In operation S17, matrix transformation is performed (S18), and then a lookup table operation is performed (S19) to display the converted RGB values (S22).

According to the present invention, by correcting the characteristics of the camera and device using the ICC profile for problems such as inaccuracy and variability of the color characteristic representation in the existing broadcasting system, it has an accurate color reproduction ability, viewers You will see the same color. This feature provides the effect of accurate color reproduction regardless of the device and camera.

Claims (11)

In the MPEG2 digital video transmitter, A camera image input unit for photographing a real image and converting the image signal into a video signal; An MPEG2 image compressor for compressing an image signal input by the camera image input unit into an MPEG2 image; An ICC profile generator for generating an ICC profile by receiving characteristic information of a camera photographing a real image; A stream grafting unit for synthesizing the video signal compressed by the MPEG2 video compression unit and the ICC profile generated by the ICC profile generation unit into one stream; MPEG2 digital video transmission apparatus using an ICC profile including a transmission unit for transmitting the stream signal synthesized by the stream grafting unit via a network. The apparatus of claim 1, wherein the characteristic information of the camera comprises at least one of inverse gamma of the camera, white color coordinates, and relationship information between a real image and a signal. The method of claim 1, wherein the ICC profile generation unit, Camera information input unit for receiving the characteristic information of the camera, A profile generation processor for generating information received through the camera information input unit into a profile form; A storage unit for storing a header table and a tag table of the ICC profile synthesized by the profile generation processor; MPEG2 digital video transmitting apparatus using an ICC profile comprising a stream generator for generating a profile stored in the storage unit as a stream. The method of claim 3, wherein in the camera information input unit, MPEG-2 digital video transmission apparatus using the ICC profile containing the camera information, the pixel information or the camera lens information. In the MPEG2 digital video reproducing apparatus, A stream separation unit for separating the video, voice stream, and ICC profile information from the stream received through the network; An MPEG2 decoding unit for decoding the video stream by MPEG2 among the streams separated by the stream separating unit; A video processing unit for processing the video signals decoded by the MPEG2 decoding unit into video signals of R ', G', and B '; An image of R '', G '', and B '' corrected by applying the ICC profile detected by the stream separation unit to the image signals of R ', G', and B 'processed by the video processing unit. ICC profile detection graft to convert to a signal, And a display unit for displaying an image according to the R ", G ", and B " video signals corrected by the ICC profile detecting and grafting unit. The apparatus of claim 5, wherein the video processor is further configured to perform color conversion and size conversion of an image to be reproduced. The method of claim 5, wherein the ICC profile detection graft, An ICC profile detector for detecting an ICC profile in the stream separated by the stream separator; A storage unit which stores a profile of the playback device; A profile application unit for applying the profile detected by the ICC profile detection unit to a reproduction device profile stored in the storage unit; An ICC profile including a color calculation unit for converting image information processed by video processing into R '', G '', and B '' corrected through lookup table and matrix operations using characteristics of a camera / display device. MPEG2 digital video player. In the video transmission method, Photographing the actual image and converting it into a video signal; Compressing the video signal into an MPEG2 video; Generating an ICC profile by receiving characteristic information of a camera photographing the actual image; Synthesizing the compressed MPEG2 video signal and the ICC profile into a single stream; MPEG2 digital video transmission method using an ICC profile for performing the step of transmitting the synthesized stream signal over a network. The method of claim 8, wherein in the generating the ICC profile, The method of claim 2, wherein the characteristic information of the camera includes relationship information between a real image and a signal or pixel information. In the MPEG2 digital video playback method, Separating the video, voice stream, and ICC profile information from the stream received over the network; Decoding the video stream from the separated stream by MPEG2; Signal processing the video signals of R ', G', and B 'to reproduce the MPEG2 decoded video signal; Applying the separated ICC profiles to the R ', G', and B 'video signals to convert them into corrected video signals of R' ', G' ', and B' '; And displaying an image according to the corrected R ", G ", and B " video signals. The method of claim 10, wherein converting the corrected video signal to: Detecting an ICC profile in the separated stream; Applying the detected profile to a pre-stored playback device profile; ICC profile for converting image information processed by video processing into R '', G '', and B '' corrected through look-up table and matrix calculation using characteristics of camera / playback device and performing correction MPEG2 digital video playback method.