KR100686137B1 - Digital broadcasting receiver, and captured image editing and saving method - Google Patents

Abstract

The present invention relates to a method of editing and storing an image captured in a digital broadcast receiver equipped with a fixed or removable storage medium. In particular, when the captured image or the edited image is an I frame, the present invention is compression encoded as it is. This has the effect of reducing the storage space of the media. In addition, the present invention provides a function of adding various texts to a captured image or a digital image, overlapping a screen, and the like, thereby easily classifying the stored digital image and providing useful information about the image.

Screen Capture, Bitmap, Edit, MPEG Encoder

Description

Digital broadcasting receiver, and captured image editing and saving method}

1 is a block diagram of a digital broadcast receiver equipped with a storage medium according to the present invention.

2 is a diagram showing an example of screen capture and image ID assignment according to the present invention;

3 is a diagram illustrating an example of adding text when editing an image according to the present invention.

4 is a diagram illustrating an example of overlapping two screens when editing an image according to the present invention.

Explanation of symbols for main parts of the drawings

110,130: selection unit 120: MPEG encoder

140: digital image input device 150: screen capture / editing unit

160: HDD 170: storage / playback unit

180: MPEG decoder

The present invention relates to a digital broadcast receiver equipped with a fixed or removable storage medium, and more particularly to a method for editing and storing screen captured images.

One popular digital TV application service is a personal video recorder (PVR) device. This is an inexpensive, large capacity hard disk drive (HDD) in digital broadcast receivers that provides additional convenience to the viewer.

In this case, various trick play may be performed on the broadcast stream stored in the HDD. That is, trick play such as slow play, fast play and reverse play is supported in addition to normal speed play. In order to play the trick, when the broadcast stream is stored, the characteristics of the video bitstream belonging to each transport stream (TS) are extracted, and index data are created and stored together, and then, when the broadcast stream is stored, the reference data is referred to. Therefore, it is possible to implement a variety of trick play to meet the needs of the viewer.

In addition, a digital broadcast receiver equipped with an HDD may be used to record and reproduce video data as well as to store various contents. For example, a TV receiver connected to the Internet may store a compressed still image or various data downloaded from the Internet onto an HDD, and a TV receiver connected to a digital camera reader may store a compressed still image on the HDD. have.

Digital TVs, on the other hand, reduce transmission errors compared to analog TVs to prevent noise and overlapping screens, resulting in high sound quality and high picture quality. In addition, by efficiently compressing and transmitting data such as voice, video, and text by excellent digital compression technology, it is possible to transmit multiple channels to one channel of existing TVs by reducing the amount of data required for one channel. It also has the advantage of providing a lot of information.

Such high quality digital TVs are rapidly replacing analog TVs, and their application range is reflecting various functions in complex and various digital TV receivers.

However, as long as analog broadcasting continues, digital TVs generally have a function of receiving and displaying analog broadcasting as well as digital broadcasting. A digital TV having a PVR function has no problem in storing and reproducing digital video data described above for digital broadcasting. However, for analog broadcasting, in order to provide a PVR function such as digital broadcasting, an additional MPEG encoder must be embedded to convert analog data into storable digital data.

The basic framework of the video compression method of the MPEG encoder uses a technique for removing spatial redundancy and temporal redundancy.

The MPEG encoder converts and quantizes data in the pixel domain into the frequency domain to remove spatial redundancy, which has the effect of removing high frequency components that are not visually sensitive and reduces the amount of data to be stored.

As a method of removing the temporal redundancy, a motion estimation and compensation technique is used. A portion having a pixel value similar to the current image frame is found from the reference image frame and encoded into a motion vector, and the remainder is encoded by frequency transforming the difference value.

On the other hand, video frame types of MPEG video have I (Intra), P (Predictive), and B (Bi-predictive). The I frame is an image frame that can be restored by itself without requiring another reference frame. A P frame requires one reference frame decoded first in decoding order. A B frame requires two reference frames that were first decoded in decoding order. Therefore, frame memory is used for the MPEG encoder. Since the I frame can be recovered by itself without a reference frame, the video decoder can be refreshed by eliminating error accumulation due to motion compensation.

Various methods such as JPEG and GIF are used for the compression of still images, and are basically based on a method of removing spatial redundancy using a discrete cosine transform (DCT). This form can be restored by itself without any other reference frame like the I frame of the video.

In addition, the digital broadcasting receiver equipped with the HDD may store and play a moving image or still image, as well as capture and store a TV screen including a scene of interest or a favorite actor.

Screen capture according to the prior art uses a method of storing an original image in a bitmap form on a frame memory.

However, conventionally, since the original image is stored as it is, there is a problem of occupying a lot of storage space. Therefore, conventionally, the storage space of the screen capture is limited.

The present invention is to solve the above problems, an object of the present invention is to capture the captured image as it is compressed form according to the picture type of the video frame or to convert to a new format using the MPEG encoder device to capture An apparatus and method for reducing the storage space of an image are provided.

Another object of the present invention is to provide a method of editing a captured image according to a desired use and compressing and storing the captured image using an MPEG encoder device.

In order to achieve the above object, the digital broadcast receiver and the captured image editing and storage method according to the present invention are compressed and encoded as it is, if the captured image or the edited image is an I frame to reduce the storage space on the storage medium, In the case of not an I frame, the data is compressed and encoded into an I frame and stored in a storage medium in a bitmap form.

The digital broadcasting receiver and the captured image editing and storage method according to the present invention include a function of compositing with another image on a bitmap image, a weighting function of overlapping each image when compositing, and a title to a captured image or an edited image. It is characterized in that it has an editing function, such as a function for assigning a function, a function for automatically inserting a synthesized date and time.

The digital broadcast receiver and the captured image editing and storage method according to the present invention are characterized in that the captured image or the edited image data stored in the storage medium includes video sequence information and picture information.

The digital broadcast receiver and the captured image editing and storage method according to the present invention are characterized in that the captured image or the edited image data stored in the storage medium includes an index indicating the image ID and the storage location.

A digital broadcast receiver for providing the hardware includes an MPEG encoder which compresses and encodes the screen captured image or the edited image data in the form of an I frame; And a screen editing function of the input image, outputting the edited image data to the MPEG encoder, and a screen capture for storing the captured image or the edited image in the form of an I frame output from the MPEG encoder in the storage medium. It is characterized by including a / editing unit.

The captured image editing and storage method for providing this to the software is:

(a) receiving screen captured image data by a screen capture command;

(b) providing a screen editing function for the image captured in step (a);

(c) compressing and encoding the captured image or the edited image data in the steps of (a) and (b) in the form of an I frame; And

(d) inserting an image ID for identifying an image and an index indicating a storage location in the data encoded and encoded in the form of I frame in step (c), and storing the data in a bitmap form in a storage medium. It features.

Other objects, features and advantages of the present invention will become apparent from the following detailed description of embodiments taken in conjunction with the accompanying drawings.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention that can specifically realize the above object will be described. At this time, the configuration and operation of the present invention shown in the drawings and described by it will be described as at least one embodiment, by which the technical spirit of the present invention and its core configuration and operation is not limited.

The present invention can reduce the storage space of the captured image on the HDD by storing the captured image in a compressed form according to the picture type of the video frame, or by compressing and storing the captured image in a new format using an already provided MPEG encoder device. . That is, if the image to be stored is an I frame, it is converted into a bitmap form and immediately stored. If the image is not an I frame, the video sequence information and the picture information are inserted using an MPEG encoder, and the image is compressed and converted into an I frame. Save as.

1 is a block diagram of a PVR device, that is, a digital broadcast receiver equipped with an HDD, according to the present invention, and includes a first selector 110, an MPEG encoder 120, a second selector 130, and a screen capture / editer. 150, the storage / playback control unit 170, the MPEG decoder 180, and the HDD 160.

In the present invention, only screen capture, image editing, and storing and reproducing the captured or edited image will be described. That is, since the decoding and display of the received analog broadcast or digital broadcast, and the storage and playback on the HDD are well known technologies, detailed descriptions thereof will be omitted.

The first selector 110 selects one of the received analog broadcast, image data captured and edited by the screen capture / editing unit 150, and image data restored by the MPEG decoder 180 to the MPEG encoder 120. Output

The second selector 130 selects one of the data encoded by the MPEG encoder 120 or the received digital broadcast and outputs it to the screen capture / editing unit 150.

The screen capture / editing unit 150 inputs the restored image data output from the MPEG decoder 180, the data output from the MPEG encoder 120 through the second selector 130, and the digital image input device 140. It controls screen capture and editing of the data. The edited image is converted to MPEG encoder 120, and the data to be stored on HDD 160 is converted into bitmap format and given an index indicating image ID and storage location. Output to the playback control unit 170. In the present invention, the storage format of the captured image or the edited image is assumed to be a bitmap, but this is one embodiment, and any storage format capable of storing still images is possible.

The storage / playback control unit 170 stores data output from the screen capture / editing unit 150 in the HDD 160 or reads the data stored in the HDD 160 and outputs the data to the MPEG decoder 180.

In the invention configured as described above, since the audio and video signals are not digital data, the analog broadcast must be converted into digital data in order to store / reproduce the received analog broadcast on the HDD 160. Therefore, the analog broadcast selected through the analog tuner (not shown) is digitized to be converted into a form that can be stored and then input to the MPEG encoder 120 via the first selector 110.

The MPEG encoder 120 encodes the input data in the MPEG compression scheme as in the data format of digital broadcasting to simplify the storage / playback control unit 170. The MPEG encoder 120 includes devices such as an audio encoder, a video encoder, a transport mux, and the like. Since the analog broadcast data converted by the MPEG encoder 120 is converted into the same form as digital broadcast data, the analog broadcast data is stored or reproduced on the HDD 160 using the storage / playback control unit 170 in the same manner as the digital broadcast data. .

Therefore, when the program to be stored is digital broadcast data, the MEPG encoder 120 does not need to operate. That is, in the case of digital broadcasting, transport (TS) data including a program corresponding to a channel selected through a digital tuner (not shown) is passed through the second selector 130 and the storage / playback control unit 170. The HDD 160 may be stored or played back. At this time, the picture index to be referred to when playing back from the program to be stored is extracted and stored in the HDD 160 together with the TS data of the corresponding program. The stored TS data is a broadcast information guide, channel information, video data, audio data, and the like. When the play command is input, the picture index is used to determine the location on the HDD 160 where the TS data is stored, and the video and audio are output through the MPEG decoder 180 according to the play mode.

The MPEG decoder 180 includes a system decoder for decoding a transport stream, a video decoder, and an audio decoder. Also, the MPEG decoder 180 uses a frame memory in which a reference frame is stored to decode a P or B picture. The video data decoded by the MPEG decoder 180 is output to the display apparatus through the frame memory, respectively.

Meanwhile, the screen capture / editing unit 150 may receive a digital image through various means. The first means receives from the frame memory a video frame corresponding to the screen captured by the screen capture command or the screen to be edited. The second means uses the MPEG encoder 120 to compress and convert the captured / edited picture back into an I frame, and receives the converted I frame from the MPEG encoder 120 to store the HDD 160. The third means receives an input from an external digital image input device 140 for editing or storing in the HDD 160. In this case, if the image to be captured is an I frame, the image may be directly input to the transport stream type through the second selector 130. If the editing is not performed, it may be directly stored in the HDD 160 without passing through the MPEG encoder 120. In this case, if the captured image is an I frame and is input from the frame memory, the I frame is compressed and encoded by the MPEG encoder 102 regardless of whether it is edited and then stored in the HDD 160.

The following describes the capture / editing process for the digital image or screen input through each means.

In this case, a screen capture method is applied differently according to the picture type of the video stream. 2 shows a series of video streams of selected digital broadcasts via a digital tuner. If the captured image or the edited image in FIG. 2 is an I frame, it is compressed and encoded in the MPEG encoder 120 as it is. In the case of a P or B frame, the MPEG encoder 120 is compressed and encoded in the form of an I frame. It is stored in the HDD 160 in the form of a map. In this case, the bitmap data stored in the HDD 160 includes video sequence information, picture information, picture data, an index indicating a storage location, and an ID for identifying a captured image.

That is, the I0 picture having the I frame type in FIG. 2 is stored in the HDD 160 with an image ID of C_I0. In this case, when the captured captured image or the edited image is displayed and viewed, the storage / playback control unit 170 reads the corresponding data from the HDD 160 using the index indicating the image ID and the storage location, and then the MPEG decoder 180 Will output Therefore, the MPEG decoded captured image is displayed on the display device.

When the captured image or the edited image in FIG. 2 is not an I frame, data of the corresponding frame stored in the frame memory after being decoded by the MPEG decoder 180 is provided to the MPEG encoder 120. The MPEG encoder 120 compresses and encodes the input frame data into an I frame and inserts corresponding video sequence information and picture information into the screen capture / editing unit 150. The screen capture / editing unit 150 requests the storage / playback control unit 170 to record the HDD 160 by assigning an index indicating an image ID and a storage location to the input data. For example, if a B4 picture having a B frame type is a screen captured frame in FIG. 2, a B4 frame reconstructed through decoding by the MPEG decoder 180 and stored in the frame memory is input to the MPEG 120 to provide video sequence information. Picture information is inserted and compressed and encoded into I frames. Subsequently, the screen capture / editing unit 150 converts the image into a bitmap form and is given an index indicating an image ID of C_I1 and a storage location, and then stored in the HDD 160 through the storage / playback control unit 170.

Meanwhile, in order to edit the captured screen or the digital image input through the digital image input apparatus 140, the captured screen or the digital image must be converted into a bitmap form. In this case, text may be added when a bitmap-type image exists in the frame memory.

As shown in FIG. 3, desired text information, that is, capture content, actor profile, scene description, and the like may be added. At this time, the position, size, and color information of the text to be added can be specified.

4 shows an example of overlapping two screens. At this time, the image can be edited for any image, such as a captured screen, a digital image input through the external digital image input device 140, an image stored in the frame memory or the HDD 160. The position and size of the screen can also be specified. And overlapping screens can make the back screen completely invisible and can be mixed by weighting each screen.

The system information also provides date and time information, so you can include the ability to add text that displays the date and time at the appropriate location.

The ability to capture digital TV screens frame-by-frame, to composite with other images, to weight and overlap each image when compositing, to give a title to a captured or edited image, and to automatically synthesize You can insert a date and time.

The edited screen is transmitted to the MPEG encoder 120 in a bitmap form to reduce the size of the stored data. The MPEG encoder 120 inserts video sequence information and picture information into the input bitmap data, compresses and encodes the image in I frame form, and outputs the encoded information to the screen capture / editing unit 150. The screen capture / editing unit 150 assigns an image ID and a storage index to the input data and stores the storage / playback control unit 170 in the HDD 160.

On the other hand, the terms used in the present invention (terminology) are terms defined in consideration of the functions in the present invention may vary according to the intention or practice of those skilled in the art, the definitions are the overall contents of the present invention It should be based on.

The present invention is not limited to the above-described embodiments, and as can be seen in the appended claims, modifications can be made by those skilled in the art to which the invention pertains, and such modifications are within the scope of the present invention.

The effects of the digital broadcast receiver and the captured image editing and storage method according to the present invention described above are as follows.

First, by compressing and encoding the captured image or the edited image into I frames and storing them in the storage medium (HDD), there is an effect of reducing the storage space of the storage medium.

Second, by adding and storing various texts and overlapping screens on the captured image or digital image, it is easy to classify the stored digital image and provide useful information about the image.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit of the present invention.

Therefore, the technical scope of the present invention should not be limited to the contents described in the embodiments, but should be defined by the claims.

Claims (9)

In a digital broadcast receiver having a storage medium, A video encoder for compressing and encoding the screen captured image or the edited image data in the form of an I frame; And It provides a screen editing function of the input image, outputs the edited image data to the video encoder, and stores the captured image or the edited image that is compressed and output in the form of I frame in the video encoder to the storage medium Digital broadcast receiver comprising a screen capture / edit unit. The video encoder of claim 1, wherein the video encoder And a corresponding video sequence information and picture information are inserted when compressing and encoding the screen captured image or the edited image data in the form of an I frame. The apparatus of claim 1, wherein the screen capture / editing unit And a captured image or edited image in the form of an I frame in a bitmap form on a storage medium. The apparatus of claim 1, wherein the screen capture / editing unit And storing an I-frame captured image or an edited image in a bitmap format by inserting an image ID and an index indicating a storage location. The apparatus of claim 1, wherein the screen capture / editing unit And reproducing the corresponding image data from a corresponding position of the storage medium by using an index indicating an image ID and a storage position when reproduction of a captured image or edited image stored in the storage medium is selected. The apparatus of claim 1, wherein the screen capture / editing unit At least capture the screen frame-by-frame, combine it with other images, weight each image as it overlaps when compositing, give a title to a captured or edited image, add text, And a function of automatically inserting a date and time. A method of editing and storing a captured image of a digital broadcast receiver with a storage medium, (a) receiving screen captured image data by a screen capture command; (b) providing a screen editing function for the image captured in step (a); (c) receiving the image captured or the edited image data captured in the steps (a) and (b) and compression-coding the image into an I frame; And (d) inserting an image ID for identifying an image and an index indicating a storage location in the data encoded and encoded in the I frame form in step (c), and storing the image in a bitmap form in the storage medium. And editing the captured image. 8. The method of claim 7, wherein step (b) At least capture the screen frame-by-frame, combine it with other images, weight each image as it overlaps when compositing, give a title to a captured or edited image, add text, A method of editing and saving a captured image, characterized by providing the ability to automatically insert a date and time. 8. The method of claim 7, wherein step (c) And inserting corresponding video sequence information and picture information when compressing and encoding the screen captured image or the edited image data in the form of an I frame.

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