KR20100081440A - Method and image displaying apparatus for inserting thumbnail image - Google Patents

Abstract

PURPOSE: A method and an image displaying device for inserting thumbnail image are provided to generate thumbnail image and insert the thumbnail image to a header of original data when a thumbnail image does not exists. CONSTITUTION: A JPEG(Joint Photographic Expert Group) header parsing unit(261) receives searching command of an original data storage unit from a user. The JPEG header parsing unit parses a header of an original data. The JPEG header parsing unit determines whether a thumbnail image exists. If the thumbnail image does not exist in the header, a JPEG thumbnail image generation unit(263) generates thumbnail image corresponding to the original data. A JPEG thumbnail image insertion unit(264) inserts the generates thumbnail image to the header.

Description

How to insert a thumbnail image and an image output apparatus performing the same {Method and image displaying apparatus for inserting thumbnail image}

The present invention relates to a method for inserting a thumbnail image and an image output apparatus for performing the same. More particularly, a method for inserting a thumbnail image into a header by parsing original data in a JPEG (Joint Photographic Expert Group) format And it relates to an image output device for performing this.

Recently, as the number of electronic devices capable of outputting images increases and the performance of the processor for processing images in the electronic devices increases, the number of images stored in the electronic devices increases at the same time. An image occupies a much larger memory footprint than a text file. However, due to the rapid development of semiconductor technology and the emergence of mobile memory, the capacity of the memory does not bring great inconvenience to the use of electronic devices.

However, when searching a large number of images stored in a large memory inside and outside the electronic device, a processing unit that can decode and display all images quickly and without delay is not available. In particular, in the case of an image, the preview image should be decoded because it is not only difficult to distinguish the image by the text title but also the image itself.

To this end, a preview image or a so-called thumbnail image is used to divide the image into an image rather than text. The thumbnail image is a re-encoded image of the original data reduced in size, which is significantly smaller than the original data, so the decoding speed is very fast, and the user can provide the image in a list format.

Accordingly, the image processing apparatus, for example, may generate a thumbnail list of files stored in the mobile communication terminal and output the thumbnail list through the display unit. 1 is an exemplary view showing a screen on which a mobile communication terminal outputs a thumbnail list.

However, not only the thumbnail image but also the alternate text or image "no preview" is output in FIG. 1. This is because a thumbnail image for the original data does not exist.

In the case of JPEG images, ISO / IEC-10928 follows the standard specification, and accordingly, JPEG includes thumbnail images in the header. However, it is not essential that the thumbnail image be included, and depending on the application generating the JPEG, the JPEG image may or may not be included.

For this reason, thumbnail images for some JPEGs are not output when the thumbnail images are output. Therefore, the user has to decode the original JPEG in order to check the JPEG.

The present invention has been made to solve the above-described problems of the prior art, by parsing the original data of the JPEG (Joint Photographic Expert Group) format to determine whether a thumbnail image exists, the thumbnail if no thumbnail image exists It is an object of the present invention to provide a method and apparatus for generating an image and inserting it into a header of original data.

Other objects of the present invention will become more apparent through the preferred embodiments described below.

According to an aspect of the present invention for achieving the above object, a method for inserting a thumbnail image is provided.

According to an embodiment of the present invention, in a method for inserting a thumbnail image into original data in JPEG (Joint Photographic Expert Group) format, the image output apparatus includes: (a) the original data when receiving a reproduction input of the original data from a user; Parsing a header of the; (b) determining whether a thumbnail image exists in the header of the original data; (c) generating a thumbnail image corresponding to the original data when the thumbnail image does not exist in the header of the original data; and (d) inserting the generated thumbnail image into the original header of the original data. Provided is a method of inserting a thumbnail image, characterized in that it comprises a.

The method of inserting the thumbnail image may further include (e) constructing a thumbnail list by referring to the thumbnail image included in the original data of the original data.

The thumbnail image inserting method may further include (g) outputting the thumbnail list when receiving a search command of the original data from a user.

In the step (c), when the thumbnail image does not exist in the header of the original data, the thumbnail image may be generated in a preset horizontal and vertical size.

The thumbnail image generating method may further include inserting the horizontal and vertical sizes into the header of the original data.

According to another embodiment of the present invention, in a method for inserting a thumbnail image into the original data in JPEG (Joint Photographic Expert Group) format, the image output device (a) when receiving a reproduction input of the original data from the user Parsing headers of data; (b) determining whether a thumbnail image is a preset horizontal and vertical size from thumbnail image information included in a header of the original data; (c) correcting the thumbnail image to a preset horizontal and vertical size when the thumbnail image does not exist in the header of the original data; and (d) inserting the corrected thumbnail image into the original header of the original data. Provided is a method for inserting a thumbnail image, comprising the steps of: a.

According to another aspect of the present invention for achieving the above object, there is provided an image output device.

According to an embodiment of the present invention, an image output apparatus, comprising: an original data storage unit for storing original data in a JPEG (Joint Photographic Expert Group) format; A header parsing unit for parsing the header of the original data and determining whether a thumbnail image exists when the original data storage unit search command is received from a user; A thumbnail image paper generating unit for generating a thumbnail image corresponding to the original data when the header parsing unit determines that the thumbnail image does not exist in the header; And a thumbnail image inserting unit for inserting a thumbnail image generated by the thumbnail image generating unit into the header.

According to an aspect of the present invention for achieving the above object, a recording medium is provided.

According to an embodiment of the present invention, a computer-readable recording medium having a program recorded thereon for implementing a method of inserting a thumbnail image into original data in JPEG (Joint Photographic Expert Group) format, the image output apparatus comprising: (a) Parsing a header of the original data when receiving a reproduction input of the original data from a user; (b) determining whether a thumbnail image exists in the header of the original data; (c) generating a thumbnail image corresponding to the original data when the thumbnail image does not exist in the header of the original data; and (d) inserting the generated thumbnail image into the original header of the original data. Provided is a computer-readable recording medium having recorded thereon a program for implementing a method of inserting a thumbnail image.

As described above, according to the present invention, an image output device can output thumbnail lists of all JPEG format original data by inserting the thumbnail image into JPEG format original data which does not include the thumbnail image in the header. have.

As the invention allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the written description. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

Terms including ordinal numbers such as first and second may be used to describe various components, but the components are not limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component. And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

When a component is referred to as being "connected" or "connected" to another component, it may be directly connected to or connected to that other component, but it may be understood that other components may be present in between. Should be. On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that there is no other component in between.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, and in describing the present invention with reference to the accompanying drawings, the same or corresponding components are given the same reference numerals regardless of the reference numerals. Duplicate explanations will be omitted.

2 is a diagram illustrating a structure of original data in JPEG format in which an image output apparatus inserts a thumbnail image according to an embodiment of the present invention.

Referring to FIG. 2, a structure (JFIF: JPEG File Interchange Format) of original data (200, hereinafter referred to as JPEG) in JPEG format is divided into several blocks. That is, SOI (Start Of Image), APP0 JFIF Marker, Additional APP Marker, Define Quantization Tables (DQF), Start Of Frame (SOF), Define Huffman Tables (DHT), Start Of Scan (SOS), Scan Data, EOI ( End Of Image).

First, the header includes a subblock such as SOI, APP0 marker, Data Length, and Identifier. The blocks related to the thumbnail images are Xthumbnail (210), Ythumbnail (220), and Thumbnail (230). The Xthumbnail 210 represents the width of the thumbnail image, and the Ythumbnail 220 represents the height of the thumbnail image. However, when no thumbnail image exists, "0" is stored. Accordingly, the image output apparatus of the present invention may parse the header of the thumbnail image and determine that the thumbnail image does not exist in the JPEG when the Xthumbnail 210 and the Ythumbnail 220 are 0.

Therefore, the image output apparatus of the present invention may output “no preview” as described in FIG. 1 instead of a thumbnail image when the user first receives a JPEG search command.

After that, when the user selects "no preview" and calls the decoding of the original JPEG, the image processing apparatus of the present invention includes a DQF that stores a quantization table, an SOF and Huffman including information about the size and sampling of the original image. The original data is decoded using the DHT holding the code table, the SOS that tells which Huffman table each component uses, and the scan data containing the color values of the pixels.

However, at the same time, the image output apparatus according to the exemplary embodiment of the present invention parses the header of the JPEG to determine whether the Xthumbnail 210 and the Ythumbnail 220 exist (other than 0 is included). If a thumbnail image does not exist, the JPEG image is decoded and output, and a thumbnail image is generated using the decoded JPEG image.

That is, a thumbnail image can be generated by reducing and re-encoding the decoded image. That is, a thumbnail image may be generated by reducing or re-encoding the decoded original JPEG using subsampling, an average value filter, and an intermediate value filter.

Thus, a JPEG in which no thumbnail image was present in the header can be included in the header after the user's first access to JPEG.

After that, when the user searches for the original data stored in the storage unit of the image output device, the thumbnail image existing in the header of the JPEG can be output, and a separate "no preview" alternative text needs to be output. There will be no.

In addition, according to an image output apparatus according to another embodiment of the present invention, a thumbnail image may be generated in a preset width (width) and height (height). For example, the size of the thumbnail image can be generated by unifying the size of 64 pixels by 32 pixels. Therefore, according to the image output apparatus according to another embodiment of the present invention, the size of all thumbnail images to be inserted into the JPEG by thumbnails of 64 pixels in width (0000040 in hexadecimal) and 32 pixels in height (0000020 in hexadecimal) When constructing a list, the screen utilization rate can be greatly increased.

In this case, the image output apparatus according to another embodiment of the present invention parses the header of the user's JPEG to determine whether the Xthumbnail 210 and the Ythumbnail 220 are 0000040 and 0000020, respectively. You can check whether is 64 pixels wide and 32 pixels high. That is, in the case of JPEG, the size of the thumbnail image may be different depending on the application in which the file is generated.

For example, a thumbnail image of a JPEG received by the image processing apparatus from the A content server is 64 pixels wide (0000040 hexadecimal) and 32 pixels vertical (0000020 hexadecimal), while a JPEG received from the B content server is horizontal. 192 pixels (00000C0) and 128 pixels (0000080) in height. In this case, when the image processing apparatus of the present invention outputs a plurality of JPEG thumbnail images in a list format (thumbnail list), the screen configuration of the thumbnail list may be inefficient. That is, each time a rearranged thumbnail image on the screen or outputting a thumbnail list, it is necessary to separately reduce or correct the thumbnail image.

Accordingly, the image output apparatus according to another embodiment of the present invention checks the size of the thumbnail image with Xthumbnail 210 and Ythumbnail 220 included in the header, and then reduces the size of the thumbnail image to 64 pixels and 32 pixels in advance and re-creates the Tthumbnail block. Can be inserted. In this case, the Xthumbnail 210 and the Ythumbnail 220 should insert the horizontal and vertical pixel sizes of the newly reduced and inserted thumbnail image.

Accordingly, in the case of outputting a thumbnail list, the list consisting of thumbnail images of the same size can be quickly output without additional reduction and correction operations.

3 is a diagram illustrating an internal configuration of an image output apparatus according to an embodiment of the present invention.

Referring to FIG. 3, the image output apparatus 250 may include a storage unit 270, a JPEG header parser 261, a JPEG decoding processor 262, a JPEG thumbnail image generator 263, and a JPEG thumbnail image inserter. 264 and display module 280.

The JPEG header parsing unit 261, the JPEG decoding processing unit 262, the JPEG thumbnail image generation unit 263, and the JPEG thumbnail image insertion unit 264 are included in the control unit 260, and the control unit 260 is a processing unit. Each of the internal components of the controller 260 may be functionally divided by a program driven by the processing unit, and each of the internal components of the controller 260 may be configured as a separate independent logic circuit.

The storage unit 270 may store a plurality of JPEG files as a memory. When the image output device receives a JPEG decoding command from a user through an input device (such as a keypad or the like), the controller 260 reads out the JPEG from the storage 270.

The JPEG header parsing unit 261 parses the JPEG header to determine whether a thumbnail image exists. Whether or not a thumbnail image exists is determined by checking whether one of the parsed blocks of Xthumbnail 210, Ythumbnail 220, and Thumbnail 230 is 0.

The JPEG decoding processor 262 decodes the original image included in the JPEG and outputs the original image to the display module 280. In addition, the JPEG thumbnail image generation unit 263 receives an enable signal only when there is no thumbnail image from the JPEG header parsing unit 261, and generates a thumbnail image from the original image of the JPEG.

The JPEG thumbnail image inserting unit 264 inserts the thumbnail image generated by the JEPG thumbnail image generating unit into a block of the thumbnail 230 included in the header of the JPEG. In this case, the horizontal and vertical sizes of the thumbnail image are also inserted into the Xthumbnail 210 and Ythumbnail 220 blocks.

Therefore, according to the image output apparatus 250 of the present invention, when a thumbnail image is not included in the JPEG, a thumbnail image is generated and inserted into the JPEG header, so that when a thumbnail list is subsequently output, there is no need to output a separate replacement image. You can quickly build a thumbnail list.

4 is a flowchart illustrating a method of inserting a thumbnail image according to an embodiment of the present invention.

Referring to FIG. 4, the image output apparatus 250 receives a JPEG decoding command from a user (S300). The JPEG command may be a command for the user to select a corresponding JPEG among a plurality of images stored in the storage.

Upon receiving such a command, the image output apparatus 250 of the present invention parses a header of a JPEG (S310). As a result of the parsing, it is determined whether a thumbnail image exists (S320). Whether or not a thumbnail image exists may be determined by checking whether one of the blocks of the Xthumbnail 210, Ythumbnail 220, and Thumbnail 230 constituting the header is 0.

If there is a thumbnail image, the thumbnail image is not generated separately, and only the original image included in the JPEG is decoded and output through the display module (S340).

However, when it is determined in step S320 that the thumbnail image does not exist, the image output apparatus 250 of the present invention decodes the original image and simultaneously generates a thumbnail image using the original image (S350). It can be reduced or re-encoded using methods such as subsampling, average filter, and median filter.

The image output device 250 inserts the generated thumbnail image into a block of the thumbnail 230 included in the header of the JPEG. In addition, the horizontal and vertical sizes of the inserted thumbnail images are also inserted into the Xthumbnail 210 and the Ythumbnail 220 (S360).

In this case, the image processing apparatus 250 according to another embodiment of the present invention may always generate the same horizontal and vertical sizes of the thumbnail image generated in operation S350. That is, when the thumbnail image does not exist in step S320, the flow advances to step S350 to generate a thumbnail image with a preset width of 64 pixels (0000040 in hexadecimal) and a height of 32 pixels (0000020 in hexadecimal). .

5 is a diagram illustrating a procedure of performing a thumbnail image insertion method according to another embodiment of the present invention.

Referring to FIG. 5, the image output apparatus 250 receives a JPEG decoding command from a user (S400). Upon receiving such a command, the image output apparatus of the present invention parses a header of a JPEG (S410). As a result of the parsing, it is determined whether the existing thumbnail image is a preset size Sth. For example, when Sth. Is set to Xthumbnail = 0000040 and Ythumbnail = 0000020, it may be determined whether the size of the thumbnail image satisfies Sth.

If the size of the thumbnail image satisfies Sth., The JPEG is decoded according to the decoding command of the user and output through the display module 280 (S440).

However, when the thumbnail information included in the header of the thumbnail image is Xthumbnail = 0000C0, Ythumbnail = 0000080, the thumbnail image is larger than the preset size, and the thumbnail image is reduced and corrected (S450). This may be done by reducing the thumbnail image using a subsampling or a median filter.

Thereafter, in step S460, the corrected thumbnail image is inserted into a block of thumbnails included in the header of the JPEG. In addition, the horizontal and vertical sizes of the corrected thumbnail image are also inserted into the Xthumbnail 210 and the Ythumbnail 220 (S460).

Therefore, according to another embodiment of the present invention, the size of the thumbnail image included in the JPEG is equally matched, and when outputting a thumbnail list in the future, it is not necessary to separately reduce the size of the thumbnail image for the screen configuration.

The method of the present invention as described above may be implemented in a program and stored in a computer-readable recording medium (CD-ROM, RAM, ROM, floppy disk, hard disk, magneto-optical disk, etc.).

Although the above has been described with reference to embodiments of the present invention, those skilled in the art may variously modify the present invention without departing from the spirit and scope of the present invention as set forth in the claims below. And can be changed.

1 is an exemplary view of a thumbnail image output through a display unit of a mobile communication terminal.

2 is a diagram illustrating a structure of original data in JPEG format in which an image output apparatus according to an embodiment of the present invention inserts a thumbnail image.

3 is a diagram illustrating an internal configuration of an image output apparatus according to an embodiment of the present invention.

4 is a flowchart illustrating a method of inserting a thumbnail image according to an embodiment of the present invention.

5 is a view showing a procedure for performing a thumbnail image insertion method according to another embodiment of the present invention.

Claims (8)

In the image output device to insert a thumbnail image in the original data of the JPEG (Joint Photographic Expert Group) format, (a) parsing a header of the original data when receiving a reproduction input of the original data from a user; (b) determining whether a thumbnail image exists in the header of the original data; (c) generating a thumbnail image corresponding to the original data when the thumbnail image does not exist in the header of the original data; and (d) inserting the generated thumbnail image into an original header of the original data. The method of claim 1, How to insert the thumbnail image and (e) constructing a thumbnail list by referring to a thumbnail image included in the original data of the original data. The method of claim 2, The thumbnail image insertion method and (g) outputting the thumbnail list when receiving a search command of the original data from a user. The method of claim 1, Step (c) is And generating the thumbnail image in a preset horizontal and vertical size when the thumbnail image does not exist in the header of the original data. The method of claim 4, wherein The thumbnail image generating method And inserting the horizontal and vertical sizes into the header of the original data. In the image output device to insert a thumbnail image in the original data of the JPEG (Joint Photographic Expert Group) format, (a) parsing a header of the original data when receiving a reproduction input of the original data from a user; (b) determining whether a thumbnail image is a preset horizontal and vertical size from thumbnail image information included in a header of the original data; (c) correcting the thumbnail image to a preset horizontal and vertical size when the thumbnail image does not exist in the header of the original data; and (d) inserting the corrected thumbnail image into an original header of the original data. In the image output device, An original data storage unit for storing original data in a Joint Photographic Expert Group (JPEG) format; A header parsing unit for parsing the header of the original data and determining whether a thumbnail image exists when the original data storage unit search command is received from a user; A thumbnail image paper generating unit for generating a thumbnail image corresponding to the original data when the header parsing unit determines that the thumbnail image does not exist in the header; And And a thumbnail image inserter for inserting a thumbnail image generated by the thumbnail image generator into the header. A computer-readable recording medium having recorded thereon a program for implementing a method of inserting a thumbnail image into original data in JPEG (Joint Photographic Expert Group) format, the image output device comprising: (a) parsing a header of the original data when receiving a reproduction input of the original data from a user; (b) determining whether a thumbnail image exists in the header of the original data; (c) generating a thumbnail image corresponding to the original data when the thumbnail image does not exist in the header of the original data; and and (d) inserting the generated thumbnail image into an original header of the original data.

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