JP2009038607A - Image display device and image display method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To display an image of high quality, in a short waiting time. <P>SOLUTION: When a television receiver (image display device) displays a still image by utilizing still image data held by a record medium of a camera, first, it is discriminated whether compressed image data of a large thumbnail image of the same image size with a still image display size in a display is included in the still image data concerned, based on image information included in the still image data (ST5). When the compressed image data is included, the television receiver reads out the compressed image data of the large thumbnail image from the record medium and decodes it, and displays the large thumbnail image on the display (ST6, ST7). Thereafter, the television receiver reads out the compressed image data of an original image from the record medium and decodes it, and further, scales it, and displays the image by original image data on the display (ST8, ST9). <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an image display device and an image display method for displaying a still image captured by, for example, a digital still camera. Specifically, in the present invention, when compressed image data of a large thumbnail image having the same image size as the still image display size on the display is present on the recording medium in addition to the compressed image data of the original image, the large thumbnail image is compressed. The present invention relates to an image display device or the like that can display a high-quality image with a short waiting time by performing image data decoding processing to obtain image data for displaying an image on a display.

  2. Description of the Related Art Conventionally, small electronic devices having an imaging function represented by a digital still camera, a digital camera recorder, a PDA (Personal Digital Assistants) having an imaging function, a mobile phone, and the like are known. In these electronic devices, image data obtained by imaging is saved as a file based on, for example, a DCF (Design Rule for Camera File system) standard.

  DCF is a standard established by the Japan Electronic Industry Development Association (JEIDA), and is based on Exif-JPEG (Exchangeable Image File Format-Joint Photographic Experts Group) and recorded in the folder structure and memory. It defines styles and guarantees compatibility between different models. With digital still cameras compatible with DCF, images can be exchanged regardless of manufacturer or model, and printing can be performed without connecting a recording medium to a compatible printer. The DCF format image file also stores information such as the shooting model, shooting date, and thumbnails.

  FIG. 2A shows a configuration example of still image data 300 stored in a memory card attached to the digital still camera. The still image data 300 includes original image compressed image data 310, thumbnail image compressed image data 320, and various types of information 330. The various information 330 includes shooting information such as shooting date and time, shooting conditions, and image information such as the number of vertical and horizontal pixels of the original image.

  In DCF, the image size of the original image is not defined. In recent years, with the increase in performance, resolution, and image quality of digital cameras and the increase in capacity of storage media such as memory cards, the size of the original image has become the mainstream. In the configuration example of the still image data 300 shown in FIG. 2A, it is shown that the number of pixels in the horizontal direction is 4000 pixels and the number of pixels in the vertical direction is 3000 pixels. In addition, in the DCF, the image size of the thumbnail image is defined as 160 pixels in the horizontal direction and 120 pixels in the vertical direction.

  As described above, still image data stored in a memory card attached to a digital still camera can be displayed on a television receiver. In general, first, a thumbnail image corresponding to each still image data stored in the memory card is displayed on the display of the television receiver, and then a predetermined original image is displayed from the memory card according to the user's selection of the thumbnail image. The image data is read and decoded, and the image (main image) based on the original image data is displayed on the display.

  Decoding processing of compressed image data of an original image in a television receiver is often performed by software due to problems such as the cost of the television receiver. In that case, if the image size of the original image is large, the time required for the decoding process becomes long, and accordingly, the waiting time until the image is displayed on the display becomes long and stress is given to the user.

Therefore, conventionally, the thumbnail image is first enlarged to the display size of the main image (still image display size on the display), and then the decoding process for the compressed image data of the original image is completed and the main image can be displayed. Then, it has been proposed to reduce the waiting time by replacing the thumbnail image display with the main image display (see, for example, the paragraph “0007” of Patent Document 1).
JP 2006-303937 A

  However, in the technique described in Patent Document 1, the thumbnail image is first enlarged and displayed in the display size of the main image. For example, if the display size of the main image is full HD size of 1920 × 1080, the thumbnail image (160 × 120) is enlarged about 10 times in both the vertical and horizontal directions, so the display has very poor image quality. The displayed image will be displayed.

  An object of the present invention is to make it possible to display a high-quality image with a short waiting time.

The concept of this invention is
Image information included in predetermined still image data is acquired from a storage medium in which compressed image data of the original image, compressed image data of the thumbnail image, and still image data including image information related to the original image and the thumbnail image are stored. An image information acquisition unit;
Based on the image information acquired by the image information acquisition unit, it is determined whether or not the predetermined still image data includes compressed image data of a large thumbnail image having the same image size as the still image display size on the display. A thumbnail image discrimination unit to
When the thumbnail image determining unit determines that the compressed image data of the large thumbnail image is included, the compressed image data of the large thumbnail image is acquired from the storage medium, and the thumbnail image determining unit acquires the large thumbnail image An image data acquisition unit that acquires compressed image data of an original image included in the predetermined still image data from the storage medium when it is determined that compressed image data of an image is not included;
An image data processing unit that performs a decoding process on the compressed image data acquired by the image data acquisition unit to obtain first image data for displaying an image on the display. It is in.

  In the present invention, the storage medium stores compressed image data of an original image, compressed image data of a thumbnail image, and still image data including image information related to the original image and the thumbnail image. The storage medium is, for example, a memory card attached to a digital still camera, and still image data is recorded in the DCF format.

  When displaying an image related to predetermined still image data, if the still image data includes compressed image data of a large thumbnail image having the same image size as the still image display size on the display, the large image is stored from the storage medium. The compressed image data of the thumbnail image is acquired and subjected to a decoding process to obtain image data for displaying the image on the display. Here, the still image display size on the display means the display size of the image (main image) based on the original image data. In this case, the decoding processing time for the compressed image data of the large thumbnail image may be shorter than the decoding processing time for the compressed image data of the original image. In this case, the obtained image data corresponds to the still image display size in the display, and can be used as it is without enlarging the image.

  On the other hand, when an image related to predetermined still image data is displayed, if the compressed image data of the large thumbnail image is not included in the still image data, the original included in the predetermined still image data from the storage medium is displayed. The compressed image data of the image is acquired, subjected to decoding processing and scaling processing, and image data for displaying the image on the display is obtained.

  Thus, in the present invention, when the still image data includes compressed image data of a large thumbnail image having the same image size as the still image display size on the display, the compressed image data of the large thumbnail image is used. Thus, image data for displaying an image on the display is obtained, and a high-quality image can be displayed on the display with a short waiting time.

  In the present invention, for example, the image data acquisition unit obtains first image data after the image data processing unit performs decoding processing on the compressed image data of the large thumbnail image to obtain a predetermined still image from the recording medium. The compressed image data of the original image included in the data is further acquired, and the image data processing unit obtains the first image data after the image data processing unit performs the decoding process on the compressed image data of the large thumbnail image. The compressed image data of the original image acquired by the data acquisition unit may be subjected to decoding processing to further obtain second image data for displaying the image on the display.

  In this case, a large thumbnail image is initially displayed on the display, but thereafter, the image display on the display is replaced with an image based on the original image data, and the image quality of the display image on the display can be improved. For example, compared with the bandwidth limitation when generating compressed image data of thumbnail images on the camera side, the bandwidth limitation at the time of downscaling after decoding the compressed image data of the original image is loosened, and the resolution is lowered with priority on image quality. If it does in this way, the image quality of the display image of a display will become high by replacement | exchange of an image as mentioned above.

  In the present invention, for example, a user operation unit that allows the user to select a high-speed mode is further provided, and the image data acquisition unit selects the high-speed mode in the user operation unit, and the thumbnail image determination unit selects a large thumbnail image. When it is determined that the compressed image data is included, the compressed image data of the large thumbnail image is acquired from the storage medium, and at least when the high-speed mode is not selected in the user operation unit, or the thumbnail image determining unit When it is determined that the compressed image data of the image is not included, the compressed image data of the original image included in the predetermined still image data may be acquired from the storage medium.

  In this case, when the high speed mode is selected, if the predetermined still image data includes the compressed image data of the large thumbnail image, the compressed image data of the large thumbnail image is used to display the image on the display. Therefore, it is possible to display a high-quality image on the display with a short waiting time. On the other hand, when the high-speed mode is not selected, the image data for displaying an image on the display is obtained using the compressed image data of the original image included in the predetermined still image data. Therefore, the high-speed mode is selected. Although the waiting time is longer than that in the case, a higher quality image can be displayed on the display from the beginning.

  In the present invention, for example, based on the image information acquired by the image information acquisition unit, an original image size determination unit that determines whether the size of the original image related to the predetermined still image data is equal to or smaller than a predetermined size. The image data acquisition unit determines that the size of the original image is not less than a certain size by the original image size determination unit, and determines that the thumbnail image determination unit includes the compressed image data of the large thumbnail image. The compressed image data of the large thumbnail image is obtained from the storage medium, and at least when the original image size determining unit determines that the size of the original image is equal to or smaller than a certain size, or the thumbnail image determining unit When it is determined that the compressed image data is not included, the compressed image data of the original image included in the storage medium or the predetermined still image data is acquired. , It may be adapted.

  Here, it is assumed that the time required to obtain the image data for displaying the image on the display by performing the decoding process on the compressed image data of the original image of a certain size or less is within a certain time. In this case, when the image size of the original image is equal to or smaller than a certain size, image data for displaying the image on the display is obtained using the compressed image data of the original image. Therefore, it is possible to display a higher quality image. On the other hand, when the image size of the original image is not smaller than a certain size, if the compressed image data of the large thumbnail image is included in the predetermined still image data, the image is displayed on the display using the compressed image data of the large thumbnail image. Therefore, it is possible to display a high-quality image on the display with a short waiting time.

The concept of the present invention is
An image display device that obtains image data for displaying an image on a display based on still image data including compressed image data of a plurality of thumbnail images having different sizes stored in a storage medium,
An image data acquisition unit that sequentially acquires the compressed image data of the thumbnail images from the storage medium from the smaller size;
An image data processing unit that performs decoding processing on the compressed image data of the thumbnail images sequentially acquired by the image data acquisition unit to obtain image data for displaying the image on the display. In the device.

  In the present invention, compressed image data of thumbnail images is acquired in order from the smaller image size than the storage medium, and each compressed image data is sequentially decoded to display image data for displaying an image on a display. Is obtained. Therefore, some image can be displayed on the display in a short time, and the size of the image displayed on the display can be sequentially increased.

  In the present invention, for example, the image data processing unit enlarges the image to the image data after the decoding process corresponding to the previous thumbnail image so that the image size of the previous thumbnail image gradually approaches the size of the next thumbnail image. You may be made to perform a process. In this case, the transition from one thumbnail image to the next thumbnail image is performed smoothly without giving the user a sense of incongruity.

  According to the present invention, when the compressed image data of the thumbnail image having the same image size as the display size on the display is present on the recording medium in addition to the compressed image data of the original image, the compressed image data of the thumbnail image is decoded. The image data for displaying the image on the display is obtained, and a high-quality image can be displayed with a short waiting time, and the stress on the user can be reduced.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a configuration example of an image display system 100 as an embodiment.

  The image display system 100 includes a television receiver 110 as an image display device, a camera (digital still camera, digital camera recorder, etc.) 130 connected to the television receiver 110 via a USB (Universal Serial Bus), a television, and the like. And a personal computer 140 connected to the receiver 110 via a home network (Ethernet). The personal computer 140 is connected to the television receiver 110 via the router 141. “Ethernet” and “Ethernet” are registered trademarks.

  For example, a memory card 131 as a storage medium is detachably attached to the camera 130. The memory card 131 stores still image data corresponding to each still image captured by the camera 130 in, for example, the DCF format. The memory card 131 stores still image data 300 having a configuration example shown in FIG. 2A or still image data 300A having a configuration example shown in FIG.

  The still image data 300 includes compressed image data 310 of an original image, compressed image data 320 of a thumbnail image, and various information 330. The various information 330 includes shooting information such as shooting date and time and shooting conditions, and image information such as a title and the number of vertical and horizontal pixels of the original image.

  On the other hand, similar to the still image data 300, the still image data 300A includes the compressed image data 310 of the original image, the compressed image data 320 of the thumbnail image, and various information 330, and further, the compressed image of the large thumbnail image. Data 340 is included.

  Here, the large thumbnail image is a thumbnail image having the same image size as the still image display size on the display of the television receiver 110 described later. For example, when the still image display size on the display is HD (High Definition), that is, 1920 × 1080, the image size of the large thumbnail image is 1920 × 1080. Here, the still image display size on the display means the display size of the image (main image) based on the original image data.

  In the still image data 300A, the various information 330 includes shooting information such as shooting date and time, shooting conditions, and image information such as a title and the number of pixels in the vertical and horizontal directions of the original image, and a large thumbnail image. Also included is information 330A relating to the compressed image data 340. This information 330A is information indicating that the compressed image data 340 of the large thumbnail image exists, the pixel size of the large thumbnail image, the storage area of the compressed image data 340 of the large thumbnail image, and the like.

  In the personal computer 140, for example, an HDD (Hard DiskDrive) 142 as a storage medium is also stored in the still image data (FIG. 2 (a), FIG. 2 (b)) in the same manner as the memory card 131 attached to the camera 130 described above. Reference) is stored.

  FIG. 3 shows a configuration example of the television receiver 110. The television receiver 110 includes a CPU (Central Processing Unit) 111, a ROM (Read Only Memory) 112, a RAM (Random Access Memory) 113, a user operation unit 114, a receiving unit 115, a USB interface (USB I / O). F) 116, an Ethernet interface (Ethernet I / F) 117, a graphics / video display unit 118, and a display 119. The CPU 111, ROM 112, RAM 113, user operation unit 114, receiving unit 115, USB interface 116, Ethernet interface 117, and graphics / video display unit 118 are connected to the internal bus 120.

  The CPU 111 controls the operation of the television receiver 110. The ROM 112 stores a processing program of the CPU 111 and the like. The RAM 113 functions as a work area for the CPU 111. The CPU 111 reads out the processing program stored in the ROM 112 as necessary, transfers the read processing program to the RAM 113 and develops it, reads the developed processing program, and executes the processing.

  The user operation unit 114 constitutes a user interface. The user operation unit 114 includes a panel on which various operation buttons are arranged, and a remote control transmission / reception unit. The user can perform a channel selection operation of the reception unit 115, a still image display operation using still image data in the camera 130 or the personal computer 140, and the like by the user operation unit 114.

  The receiving unit 115 processes broadcast signals such as terrestrial digital broadcast, BS digital broadcast, and CS digital broadcast, and outputs image data of the selected channel. The receiving unit 115 is provided with an antenna terminal 121. A broadcast signal received by an antenna (not shown) is input to the receiving unit 115 through the antenna terminal 121.

  A USB connector 122 is derived from the USB interface 116. The camera 130 described above is connected to the USB interface 116 using the USB connector 122. An Ethernet connector 123 is led out from the Ethernet interface 117. The personal computer 140 described above is connected to the Ethernet interface 117 using the Ethernet connector 123.

  The graphics / video display unit 118 obtains image data to be output to the display 119 by performing multi-screen processing, graphics data superimposition processing, or the like on the image data obtained by the receiving unit 115 as necessary. . Note that the compressed image data of the original image or thumbnail image transmitted from the camera 130 or the personal computer 140 is decoded by software by the CPU 111 and the RAM 113. The graphics / video display unit 118 performs image resizing processing (scaling processing), multi-screen processing, graphics data processing on the image data of the original image or thumbnail image obtained by the decoding processing as necessary. Image data to be output to the display 119 is obtained by performing superimposition processing or the like.

  The display 119 is configured by a flat panel display such as an LCD (Liquid Crystal Display) or a PDP (Plasma Display Panel). In this embodiment, the display 119 can display full HD (High Definition).

  The operation of the television receiver 110 shown in FIG. 3 will be described. First, the operation when receiving a broadcast signal will be described. Broadcast signals received by an antenna (not shown) are input to the receiving unit 115 through the antenna terminal 121. The receiving unit 115 selects a predetermined channel based on a user's channel selection operation by the user operation unit 114, and obtains image data of the predetermined channel.

  Then, the image data of a predetermined channel obtained by the receiving unit 115 is supplied to the graphics and video display unit 118. In the graphics / video display unit 118, multi-screen processing, graphics data superimposition processing, and the like are performed on the image data of the predetermined channel as necessary. The image data processed by the graphics / video display unit 118 is supplied to the display 119. As a result, an image of the channel selected by the receiving unit 115 is displayed on the display 119.

  Next, an operation example at the time of still image display using still image data existing in the camera 130 or the personal computer 140 in the television receiver 110 will be described with reference to a flowchart of FIG.

  First, in step ST1, the CPU 111 starts a still image display process. In this case, the CPU 111 starts a still image display process when the user operates the user operation unit 114 to instruct a still image display.

  Next, in step ST <b> 2, the CPU 111 reads out title information and thumbnail image (160 × 120) compressed image data in each still image data from the memory card 131 mounted on the camera 130 via USB, and temporarily stores them in the RAM 113. To accumulate. Similarly, in step ST <b> 2, the CPU 111 reads title information and thumbnail image (160 × 120) compressed image data in each still image data from the HDD 142 of the personal computer 140 via Ethernet and temporarily stores them in the RAM 113.

  Next, in step ST3, the CPU 111 decodes the compressed image data of the thumbnail image of each still image data stored in the RAM 113 in step ST2. In step ST3, the CPU 111 generates image data for displaying a list of a plurality of thumbnail images on the graphics / video display unit 118 based on the image data and title information of each thumbnail image after the decoding process. Thus, a list of a plurality of thumbnail images is displayed on the display 119.

  Next, in step ST4, the user refers to a list display of a plurality of thumbnail images displayed on the display 119 and selects a desired image. The user selection operation is performed by the user operation unit 114.

  When the user selects a desired image in step ST4, the CPU 111 proceeds to the process in step ST5. That is, in step ST5, the CPU 111 reads image information included in still image data corresponding to the image selected by the user from the camera 130 or the personal computer 140, and displays the still image display size on the display 119 as the still image data. It is determined whether or not compressed image data of a large thumbnail image having the same image size is included.

  When the still image data includes compressed image data of a large thumbnail image, the CPU 111 reads out the compressed image data of the large thumbnail image from the camera 130 or the personal computer 140 and temporarily stores it in the RAM 113 in step ST6. To do. Then, the CPU 111 performs decoding processing on the compressed image data of the large thumbnail image stored in the RAM 113 to obtain image data for displaying an image on the display 119.

  Next, in step ST <b> 7, the CPU 111 supplies the decoded image data to the display 119 via the graphics / image display unit 118, and displays an image using large thumbnail image data on the display 119. In this case, a thumbnail image having the same image size as the still image display size on the display 119 is displayed on the display 119. After the process in step ST7, the CPU 111 moves to step ST8.

  When the still image data does not include the compressed image data of the large thumbnail image in step ST5 described above, the CPU 111 immediately proceeds to step ST8. In step ST8, the CPU 111 reads the compressed image data of the original image included in the still image data from the camera 130 or the personal computer 140, and temporarily stores it in the RAM 113. Then, the CPU 111 performs a decoding process on the compressed image data of the original image stored in the RAM 113.

  Next, in step ST <b> 9, the CPU 111 performs downscaling processing on the image data after the decoding processing in the graphics / video display unit 118 so that the image size matches the still image display size on the display 119. In addition, image display based on original image data is performed. After the process of step ST9, the CPU 111 moves to step ST10 and ends the still image display process.

  As described above, in the television receiver 110 of the image display system 100 shown in FIG. 1, when still images are displayed, the still image data related to the image selected by the user includes compressed image data of a large thumbnail image. In this case, the compressed image data of the large thumbnail image is read from the camera 130 or the personal computer 140, the image data is decoded, and the display 119 has a large image size that is the same as the still image display size on the display 119. A thumbnail image is displayed.

  In this case, the time required to decode the compressed image data of the large thumbnail image is shorter than the time required to decode the compressed image data of the original image. The image size of the large thumbnail image is the same as the still image display size on the display 119, and the image data after decoding can be supplied to the display 119 as it is without performing image enlargement processing.

  Therefore, in the television receiver 110 of the image display system 100 shown in FIG. 1, when the still image data related to the image selected by the user includes compressed image data of a large thumbnail image, the display 119 has a high quality. Can be displayed with a short waiting time.

  Further, in the television receiver 110 of the image display system 100 shown in FIG. 1, after the large thumbnail image is displayed on the display 119, the image display on the display 119 is replaced with an image based on the original image data. The image quality of the finally displayed image can be improved. For example, compared with the bandwidth limitation when generating the compressed image data of the thumbnail image on the camera side, the bandwidth limitation at the time of downscaling in the graphics / video display unit 118 after decoding the compressed image data of the original image is relaxed. If the resolution is lowered with priority on image quality, the image quality of the display image on the display 119 is improved by the image replacement as described above.

  Next, another operation example of the television receiver 110 when still images are displayed using still image data existing in the camera 130 or the personal computer 140 will be described with reference to the flowchart of FIG. This operation example is an example in which the user can select the high speed mode by the user operation unit 114. In FIG. 5, steps corresponding to those in FIG. 4 are denoted by the same reference numerals, and detailed description thereof is omitted.

  When the user selects a desired image in step ST4, the CPU 111 proceeds to the process in step ST11. That is, in step ST11, the CPU 111 determines whether or not the high speed mode is selected. When the high-speed mode is selected, the CPU 111 proceeds to step ST5, reads image information included in still image data corresponding to the image selected by the user from the camera 130 or the personal computer 140, and stores the image information in the still image data. It is determined whether or not compressed image data of a large thumbnail image having the same image size as the still image display size on the display 119 is included. On the other hand, when the high speed mode is not selected, the CPU 111 immediately proceeds to step ST8. Other steps in the flowchart of FIG. 5 are the same as those in the flowchart of FIG.

  When the television receiver 110 operates as shown in the flowchart of FIG. 5, when the high-speed mode is selected at the time of still image display, the television receiver 110 applies a large amount of still image data related to the image selected by the user. If the compressed image data of the thumbnail image is included, the compressed image data of the large thumbnail image is read from the camera 130 or the personal computer 140, the compressed image data is decoded, and the display 119 is displayed on the display 119. A large thumbnail image having the same image size as the still image display size is displayed. Therefore, a high-quality image can be displayed on the display 119 with a short waiting time.

  On the other hand, when the high-speed mode is not selected at the time of still image display, the television receiver 110 can display the camera 130 or the compressed image data of the large thumbnail image even if the still image data related to the image selected by the user is included. The compressed image data of the original image is read from the personal computer 140, the compressed image data is decoded, and an image based on the original image data is displayed on the display 119. Therefore, the waiting time until an image is displayed on the display 119 is longer than when the high-speed mode is selected, but a high-quality image can be displayed on the display 119 from the beginning.

  In the flowchart shown in FIG. 5, the process of step ST5 for determining whether there is large thumbnail image data is performed after the process of step ST11 for determining whether the high speed mode is selected. However, the order of the process of step ST5 and the process of step ST11 may be reversed. In this case, it is first determined whether there is large thumbnail image data, and it is determined whether the high speed mode is selected only when large thumbnail image data exists.

  Next, still another operation example at the time of still image display using still image data existing in the camera 130 or the personal computer 140 in the television receiver 110 will be described with reference to a flowchart of FIG. In this operation example, when the size of the original image is equal to or smaller than a predetermined size, an image based on the original image data is displayed even when there is compressed image data of a large thumbnail image. In FIG. 6, steps corresponding to those in FIG. 4 are denoted by the same reference numerals, and detailed description thereof is omitted.

  When the user selects a desired image in step ST4, the CPU 111 proceeds to the process in step ST12. That is, in this step ST12, the CPU 111 reads image information included in still image data corresponding to the image selected by the user from the camera 130 or the personal computer 140, and the size of the original image related to the still image data is constant. It is determined whether or not: Here, it is assumed that the time required to obtain the image data for displaying the image on the display by performing the decoding process on the compressed image data of the original image of a certain size or less is within a certain time.

  When the image size of the original image is not equal to or smaller than the predetermined size, the CPU 111 proceeds to step ST5, reads image information included in still image data corresponding to the image selected by the user from the camera 130 or the personal computer 140, and It is determined whether or not the data includes compressed image data of a large thumbnail image having the same image size as the still image display size on the display 119. On the other hand, when the image size of the original image is equal to or smaller than the predetermined size, the CPU 111 immediately proceeds to step ST8. Other steps in the flowchart of FIG. 6 are the same as those of the flowchart of FIG.

  When the television receiver 110 operates as shown in the flowchart of FIG. 6, when the television receiver 110 displays a still image, and the image size of the original image is not less than a certain size, the still image associated with the image selected by the user is displayed. If the compressed image data of the large thumbnail image is included in the data, the compressed image data of the large thumbnail image is read from the camera 130 or the personal computer 140, the image data is subjected to decoding processing, and the display 119 A large thumbnail image having the same image size as the still image display size on the display 119 is displayed. Therefore, a high-quality image can be displayed on the display 119 with a short waiting time.

  On the other hand, when the still image is displayed, when the image size of the original image is equal to or smaller than the predetermined size, the television receiver 110 may include compressed image data of a large thumbnail image in the still image data related to the image selected by the user. Then, the compressed image data of the original image is read from the camera 130 or the personal computer 140, the decoding process is performed on the compressed image data, and an image based on the original image data is displayed on the display 119. Therefore, it is possible to display a higher quality image on the display with a waiting time of a certain time or less.

  In the flowchart shown in FIG. 6, the process of step ST5 for determining whether there is large thumbnail image data after the process of step ST12 for determining whether the image size of the original image is equal to or smaller than a certain size. However, the order of the process of step ST5 and the process of step ST12 may be reversed. In this case, it is determined whether or not there is first large thumbnail image data. Only when there is large thumbnail image data, it is determined whether or not the image size of the original image is equal to or smaller than a certain size.

  Next, another operation example at the time of still image display using still image data existing in the camera 130 or the personal computer 140 in the television receiver 110 will be described with reference to a flowchart of FIG. In this operation example, when the high-speed mode is selected and the size of the original image is not less than a certain size, if there is compressed image data of a large thumbnail image, an image based on the large thumbnail image data is displayed. . In FIG. 7, steps corresponding to those in FIG. 4 are denoted by the same reference numerals, and detailed description thereof is omitted.

  When the user selects a desired image in step ST4, the CPU 111 moves to step ST11. That is, in step ST11, the CPU 111 determines whether or not the high speed mode is selected. When the high-speed mode is selected, the CPU 111 proceeds to step ST5, reads image information included in still image data corresponding to the image selected by the user from the camera 130 or the personal computer 140, and stores the image information in the still image data. It is determined whether or not compressed image data of a large thumbnail image having the same image size as the still image display size on the display 119 is included. On the other hand, when the high speed mode is not selected, the CPU 111 immediately proceeds to step ST8.

  If the still image data includes the compressed image data of the large thumbnail image in step ST5, the CPU 111 moves to step ST112. That is, in this step ST12, the CPU 111 reads image information included in still image data corresponding to the image selected by the user from the camera 130 or the personal computer 140, and the size of the original image related to the still image data is constant. It is determined whether or not:

  When the image size of the original image is not equal to or smaller than the predetermined size, the CPU 111 proceeds to step ST6. On the other hand, when the image size of the original image is equal to or smaller than the predetermined size, the CPU 111 immediately proceeds to step ST8. Other steps in the flowchart of FIG. 7 are the same as those of the flowchart of FIG.

  When the television receiver 110 operates as shown in the flowchart of FIG. 7, when the television receiver 110 is set to the high-speed mode during still image display and the image size of the original image is not less than a certain size, If the compressed image data of the large thumbnail image is included in the still image data related to the image selected by the user, the compressed image data of the large thumbnail image is read from the camera 130 or the personal computer 140 and decoded with respect to the image data. Processing is performed, and a large thumbnail image having the same image size as the still image display size on the display 119 is displayed on the display 119. Therefore, a high-quality image can be displayed on the display 119 with a short waiting time.

  On the other hand, when displaying a still image, the television receiver 110 displays a large thumbnail in the still image data related to the image selected by the user when at least the high-speed mode is not set or the image size of the original image is equal to or smaller than a certain size. Even if compressed image data of the image is included, the compressed image data of the original image is read from the camera 130 or the personal computer 140, the decoded image data is subjected to decoding processing, and an image based on the original image data is displayed on the display 119. indicate. Therefore, a higher quality image can be displayed on the display from the beginning.

  In the flowchart shown in FIG. 7, the process in step ST11 for determining whether or not the high-speed mode is selected, the process in step ST5 for determining whether or not there is large thumbnail image data, and the image size of the original image is constant. Although the order of processing in step ST12 for determining whether or not the size is equal to or smaller than the size, the order of these processes is not limited to this order.

  Next, still another operation example at the time of still image display using still image data existing in the camera 130 or the personal computer 140 in the television receiver 110 will be described with reference to a flowchart of FIG.

  First, in step ST21, the CPU 111 starts a still image display process. In this case, the CPU 111 starts a still image display process when the user operates the user operation unit 114 to instruct a still image display.

  Next, in step ST <b> 22, the CPU 111 reads the title information and thumbnail image (160 × 120) compressed image data in each still image data from the memory card 131 mounted on the camera 130 via USB, and temporarily stores them in the RAM 113. To accumulate. Similarly, in step ST <b> 22, the CPU 111 reads title information and thumbnail image (160 × 120) compressed image data of each still image data from the HDD of the personal computer 140 via Ethernet, and temporarily stores them in the RAM 113.

  Next, in step ST23, the CPU 111 decodes the compressed image data of the thumbnail image of each still image data stored in the RAM 113 in step ST22. Further, in step ST23, the CPU 111 creates image data for displaying a list of a plurality of thumbnail images on the graphics / video display unit 118 based on the image data and title information of each thumbnail image after the decoding process. Thus, a list of a plurality of thumbnail images is displayed on the display 119.

  Next, in step ST24, the user refers to a list display of a plurality of thumbnail images displayed on the display 119 and selects a desired image. The user selection operation is performed by the user operation unit 114.

  When the user selects a desired image in step ST24, the CPU 111 moves to step ST25. In step ST <b> 25, the CPU 111 reads out the compressed image data of the thumbnail image having the minimum image size included in the still image data corresponding to the image selected by the user from the camera 130 or the personal computer 140, and stores it in the RAM 113. Accumulate temporarily. Then, the CPU 111 performs a decoding process on the compressed image data of the thumbnail images stored in the RAM 113 and displays the thumbnail image having the minimum image size on the display 119.

  Next, in step ST26, the CPU 111 reads out image information from the still image data corresponding to the image selected by the user, and whether or not the still image data includes the compressed image data of the next-sized thumbnail image. Is determined. When the still image data includes the compressed image data of the next-sized thumbnail image, the CPU 111 includes the still image data corresponding to the image selected by the user from the camera 130 or the personal computer 140 in step ST27. The compressed image data of the next thumbnail image is read and temporarily stored in the RAM 113.

  In step ST27, the CPU 111 starts decoding processing on the compressed image data of the next-sized thumbnail image stored in the RAM 113. In step ST <b> 28, the CPU 111 starts scaling processing for sequentially enlarging the previous thumbnail image to the size of the next thumbnail image on the graphics / video display unit 118. Thereby, the images displayed on the display 119 are sequentially enlarged.

  Next, in step ST <b> 29, the CPU 111 determines whether or not the enlargement is finished and the decoding is finished. When both are completed, in step ST30, the CPU 111 supplies the image data after decoding the thumbnail image of the next size to the display 119 through the graphics / video display unit 118, and the image displayed on the display 119. Is replaced with a thumbnail image of the next size. After the process of step ST30, the CPU 111 returns to step ST26 and repeats the same process as described above.

  When the next size thumbnail image is not included in the still image data in step ST26, the CPU 111 converts the still image data corresponding to the image selected by the user from the camera 130 or the personal computer 140 in step ST31. The compressed image data of the original image included is read and temporarily stored in the RAM 113.

  In step ST31, the CPU 111 starts decoding processing on the compressed image data of the original image stored in the RAM 113. In step ST <b> 32, the CPU 111 starts scaling processing in which the graphics / video display unit 118 sequentially enlarges the previous thumbnail image to the still image display size on the display 119. Thereby, the images displayed on the display 119 are sequentially enlarged. If the image size of the previous thumbnail image is the same as the still image display size on the display 119, the CPU 111 does not perform the process of step ST32.

  Next, in step ST33, the CPU 111 determines whether enlargement has ended and decoding has ended. When both are completed, in step ST34, the CPU 111 performs downscaling processing on the image data after the decoding processing in the graphics / video display unit 118 so that the image size matches the still image display size on the display 119. The image displayed on the display 119 is replaced with an image based on the original image data. After the process of step ST34, the CPU 111 moves to step ST35 and ends the still image display process.

  When the television receiver 110 operates as shown in the flowchart of FIG. 8, thumbnail images are sequentially displayed on the display 119 in accordance with the selection of a desired image by the user, and the thumbnail images are finally displayed. An image based on the original image data is displayed. In this case, the time required for decoding the compressed image data of the thumbnail image having a small image size is short. Therefore, after the user selects a desired image, the first image can be displayed in a short time, and the displayed image is gradually changed to a large thumbnail image. Finally, a high-quality image based on the original image data is displayed on the display 119. It can be displayed, and finally a high-quality image can be presented to the user without causing stress to the user.

  Further, when the television receiver 110 operates as shown in the flowchart of FIG. 8, the image displayed on the display 119 is sequentially enlarged until it becomes the same size as the image of the next image size, and then the next image. Replaced with a size image. Therefore, the replacement of the image can be performed smoothly without causing the user to feel uncomfortable.

  Here, how the image displayed on the display 119 changes with respect to the still image data 300 as shown in FIG. Initially, a thumbnail image (160 × 120) corresponding to the compressed image data 320 of the thumbnail image is displayed, and then the image size of the thumbnail image is sequentially enlarged, and finally the still image display size (1920 on the display 119). × 1080) and then replaced with a high-quality image corresponding to the compressed image data 310 of the original image.

  Also, how the image displayed on the display 119 changes with respect to the still image data 300A as shown in FIG. 2B will be described. Initially, a thumbnail image (160 × 120) corresponding to the compressed image data 320 of the thumbnail image is displayed, and then the image size of the thumbnail image is sequentially enlarged, and finally the still image display size (1920 on the display 119). × 1080), and then replaced with a high-quality image corresponding to the compressed image data 340 of the thumbnail image of HD (1920 × 1080), and then, corresponding to the compressed image data 310 of the original image Replaced with higher quality images.

  Also, how the image displayed on the display 119 changes with respect to the still image data 300B as shown in FIG.

  First, the still image data 300B will be described. Similar to the still image data 300A, the still image data 300B includes the compressed image data 310 of the original image, the compressed image data 320 of the thumbnail image, the compressed image data 340 of the large thumbnail image, and various information 330. Further, it includes compressed image data 350 of a middle thumbnail image.

  Here, the middle thumbnail image is a thumbnail image having an image size (640 × 480) corresponding to VGA (Video Graphics Array). In the still image data 300B, the various information 330 includes shooting information such as shooting date and time, shooting conditions, and image information such as a title and the number of pixels in the vertical and horizontal directions of the original image, and a large thumbnail image. Also included is information 330B regarding the compressed image data 340 and the compressed image data 350 of the middle thumbnail image.

  An image change will be described. Initially, a thumbnail image (160 × 120) corresponding to the compressed image data 320 of the thumbnail image is displayed, and then the image size of the thumbnail image is sequentially enlarged, and finally the thumbnail image of the next size is displayed. The size is the same as the size (640 × 480), and thereafter, the image is replaced with an image corresponding to the compressed image data 350 of the thumbnail image having the VGA (640 × 480).

  After that, the image size of the thumbnail images is sequentially enlarged and finally becomes the same as the still image display size (1920 × 1080) on the display 119, and then the thumbnail image with the image size of HD (1920 × 1080) is compressed. A high-quality image corresponding to the image data 340 is replaced with a higher-quality image corresponding to the compressed image data 310 of the original image.

  In the above-described embodiment, the present invention is applied to the television receiver 110. However, the present invention is similarly applied to other electronic devices in which the broadcast signal reception function is replaced with other functions. Applicable to.

  The present invention can be applied to electronic devices such as a television receiver that reads still image data held by a camera, a personal computer, and the like and displays a still image.

It is a block diagram which shows the structural example of the image display system as embodiment of this invention. It is a figure which shows the structural example of still image data. It is a block diagram which shows the structural example of the television receiver as an image display apparatus. 6 is a flowchart illustrating an operation example when displaying a still image using still image data existing in a camera or a personal computer in a television receiver. 12 is a flowchart illustrating another example of operation when a still image is displayed using still image data existing in a camera or a personal computer in the television receiver. 12 is a flowchart showing still another operation example when displaying a still image using still image data existing in a camera or a personal computer in the television receiver. 12 is a flowchart illustrating another example of an operation when a still image is displayed using still image data existing in a camera or a personal computer in the television receiver. 12 is a flowchart showing still another operation example when displaying a still image using still image data existing in a camera or a personal computer in the television receiver.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 100 ... Image display system, 110 ... Television receiver, 111 ... CPU, 112 ... ROM, 113 ... RAM, 114 ... User operation part, 115 ... Reception part, 116 ... USB interface, 117 ... Ethernet interface, 118 ... Graphics / video display unit, 119 ... Display, 120 ... Internal bus, 121 ... Antenna terminal, 122 ... USB connector , 123 ... Ethernet connector, 130 ... Camera, 131 ... Memory card, 140 ... Personal computer, 141 ... Router, 142 ... Hard disk drive, 300, 300A, 300B ... Stationary Image data

Claims (7)

Image information included in predetermined still image data is acquired from a storage medium in which compressed image data of the original image, compressed image data of the thumbnail image, and still image data including image information related to the original image and the thumbnail image are stored. An image information acquisition unit;
Based on the image information acquired by the image information acquisition unit, it is determined whether or not the predetermined still image data includes compressed image data of a large thumbnail image having the same image size as the still image display size on the display. A thumbnail image discrimination unit to
When the thumbnail image determining unit determines that the compressed image data of the large thumbnail image is included, the compressed image data of the large thumbnail image is acquired from the storage medium, and the thumbnail image determining unit acquires the large thumbnail image An image data acquisition unit that acquires compressed image data of an original image included in the predetermined still image data from the storage medium when it is determined that compressed image data of an image is not included;
An image data processing unit that performs a decoding process on the compressed image data acquired by the image data acquisition unit to obtain first image data for displaying an image on the display. . The image data acquisition unit converts the compressed image data of the large thumbnail image into the predetermined still image data from the recording medium after the image data processing unit performs decoding processing on the compressed image data of the large thumbnail image to obtain the first image data. Further acquiring compressed image data of the included original image,
The image data processing unit decodes the compressed image data of the large thumbnail image by the image data processing unit to obtain the first image data, and then obtains the original image acquired by the image data acquisition unit. The image display device according to claim 1, wherein the compressed image data is decoded to further obtain second image data for displaying an image on the display. A user operation unit that allows the user to select a high-speed mode;
The image data acquisition unit
When the high-speed mode is selected in the user operation unit and the thumbnail image determination unit determines that the compressed image data of the large thumbnail image is included, the large thumbnail image is compressed from the storage medium. Get image data,
At least when the high-speed mode is not selected by the user operation unit, or when the thumbnail image determination unit determines that the compressed image data of the large thumbnail image is not included, the predetermined still image from the storage medium The image display device according to claim 1, wherein compressed image data of an original image included in the image data is acquired. Based on the image information acquired by the image information acquisition unit, further comprising an original image size determination unit for determining whether the size of the original image related to the predetermined still image data is equal to or smaller than a certain size,
The image data acquisition unit
When the original image size determining unit determines that the size of the original image is not less than a predetermined size and the thumbnail image determining unit determines that the compressed image data of the large thumbnail image is included, the storage medium The compressed image data of the above large thumbnail image from
When at least the original image size determining unit determines that the size of the original image is equal to or smaller than a certain size, or when the thumbnail image determining unit determines that the compressed image data of the large thumbnail image is not included 2. The image display device according to claim 1, wherein compressed image data of an original image included in the predetermined still image data is acquired from the storage medium. Image information included in predetermined still image data is acquired from a storage medium in which compressed image data of the original image, compressed image data of the thumbnail image, and still image data including image information related to the original image and the thumbnail image are stored. An image information acquisition step;
Based on the image information acquired in the image information acquisition step, it is determined whether or not the predetermined still image data includes compressed image data of a large thumbnail image having the same image size as the still image display size on the display. Thumbnail image discrimination step to be performed,
When it is determined that the compressed image data of the large thumbnail image is included in the thumbnail image determining step, the compressed image data of the large thumbnail image is obtained from the storage medium, and the large thumbnail image is acquired in the thumbnail image determining step. When it is determined that the compressed image data of the image is not included, an image data acquisition step of acquiring the compressed image data of the original image included in the predetermined still image data from the storage medium;
An image data processing method comprising: an image data processing step of performing decoding processing on the compressed image data acquired in the image data acquisition step to obtain image data for displaying an image on the display. An image display device that obtains image data for displaying an image on a display based on still image data including compressed image data of a plurality of thumbnail images having different sizes stored in a storage medium,
An image data acquisition unit that sequentially acquires the compressed image data of the thumbnail images from the storage medium from the smaller size;
An image data processing unit that performs decoding processing on the compressed image data of the thumbnail images sequentially acquired by the image data acquisition unit to obtain image data for displaying the image on the display. apparatus. The image data processing unit performs an image enlargement process on the image data after the decoding process corresponding to the previous thumbnail image so that the image size of the previous thumbnail image gradually approaches the size of the next thumbnail image. The image display device according to claim 6.

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