JP2011081199A - Display device and method of controlling the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technique capable of displaying an image based on an image file including a plurality of image data having luminance different from one another and an image based on an image file including a single image data, on one screen at the same time by using proper display methods respectively. <P>SOLUTION: The display device has: a plurality of frame memories; a means for determining whether an inputted image file is the first image file including the single image data or the second image file including the plurality of image data having luminance different from one another; a means of writing the single image data into each of the plurality of frame memories when the first image file is inputted, and writing the plurality of image data included in the second image file into the plurality of frame memories respectively when the second image file is inputted; and a means for reading and displaying all image data written in the frame memories while switching the plurality of frame memories in the order. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a display device and a control method thereof.

Conventionally, a method for obtaining an image having a wide dynamic range is known.
For example, Patent Document 1 discloses an apparatus that obtains an image with a wide dynamic range by combining an image with proper exposure and an image with changed exposure.
Patent Document 2 discloses an apparatus that obtains an image with a wide dynamic range by synthesizing images with different imaging times.

In addition, when at least two images having different brightness (grayscale images) are repeatedly displayed in order at a speed of about 120 times per second, an image having a higher number of gradations than the number of gradations that can be processed by the display device is displayed. You can make it look like you are. This display method is called HDR (High Dynamic Range) display.
In order to perform HDR display, at least two grayscale images are required. Hereinafter, an image file including these grayscale image data (a plurality of image data having different brightnesses) is referred to as an HDR file.

  On the other hand, an image display method using an image file (non-HDR file) including single image data such as bitmap image data or JPEG image data is different from HDR display. Therefore, it becomes a problem to simultaneously display an image based on an HDR file and an image based on a non-HDR file on one screen by an appropriate display method.

Japanese Patent Application Laid-Open No. 8-214111 JP 2003-46857 A

  The present invention is a technique capable of simultaneously displaying an image based on an image file including a plurality of image data having different brightness and an image based on an image file including a single image data on a single screen by an appropriate display method. The purpose is to provide.

  The display device of the present invention includes a plurality of frame memories and a second image file in which the input image file is a first image file including single image data or a plurality of image data having different brightnesses. When the first image file is input and the determination means for determining whether the first image file is input, the single image data is written in each of the plurality of frame memories, and the second image file is input when the second image file is input. A writing means for writing a plurality of image data contained in a file into a plurality of frame memories, respectively, and a display means for reading and displaying all the image data written in the frame memory while sequentially switching the plurality of frame memories. It is characterized by having.

The display device according to the present invention includes a frame memory and a second image file in which the input image file is a first image file including a single image data or a plurality of image data having different brightnesses. When the first image file is input, the determination means for determining whether the image is a single image data is written in the frame memory, and when the second image file is input, it is included in the second image file. A writing unit that writes any one of the plurality of image data to the frame memory; and a display unit that repeatedly reads and displays all the image data written to the frame memory. The writing unit receives the second image file. The image data written in the frame memory among the plurality of image data included in the second image file is displayed by the display means. And switches in order in synchronization with the timing of the only out.

  The display device control method according to the present invention is a control method for a display device having a plurality of frame memories, wherein the input image file is a first image file including a single image data or the brightness is low. A determination step for determining whether the second image file includes a plurality of image data different from each other; and when the first image file is input, the single image data is written to each of the plurality of frame memories; When an image file is input, a plurality of image data included in the second image file are written to the frame memory while sequentially switching between the plurality of frame memories, and a writing step of writing to the plurality of frame memories. A display step of reading and displaying all image data.

  The display device control method of the present invention is a control method for a display device having a frame memory, wherein the input image file is a first image file including a single image data, or the brightness is low. A determination step for determining whether the second image file includes a plurality of different image data, and when the first image file is input, the single image data is written to the frame memory and the second image file is input. A write step for writing any of the plurality of image data included in the second image file to the frame memory, and a display step for repeatedly reading and displaying all the image data written in the frame memory. In the writing step, when the second image file is input, a plurality of image data included in the second image file are stored. The image data written in the frame memory, and switches sequentially in synchronism with the timing of reading in the display step.

  According to the present invention, an image based on an image file including a plurality of image data having different brightness and an image based on an image file including a single image data can be simultaneously displayed on one screen by an appropriate display method. Technology that can be provided.

1 is a block diagram illustrating a functional configuration of a display device according to Embodiment 1. FIG. The figure which shows the structure of a non-HDR file and a HDR file. FIG. 3 is a diagram illustrating an image display method in the display device according to the first embodiment. 3 is a flowchart showing a flow of processing in the display device according to the first embodiment. FIG. 6 is a block diagram illustrating a functional configuration of a display device according to a second embodiment. FIG. 10 is a diagram illustrating an image display method in the display device according to the second embodiment. 10 is a flowchart showing a flow of processing in the display device according to the second embodiment.

<Example 1>
Hereinafter, a display device and a control method thereof according to Embodiment 1 of the present invention will be described. FIG. 1 is a block diagram illustrating an example of a functional configuration of the display device 100 according to the present embodiment.

A removable recording medium 101, an HDD (Hard Disk Drive) 102, and a memory 103 are recording units capable of storing image files.
The CPU 104 reads an image file (an image file specified by the user) from the recording unit (for example, a recording unit specified by the user) via the system bus 109. The CPU 104 determines whether the read image file (input image file) is a non-HDR file (first image file) or an HDR file (second image file). Based on the determination result, the image data included in the image file is written to the frame memory 105 or the frame memory 106 via the system bus 109. Further, the CPU 104 outputs a control signal via the system bus 109 to control the recording unit described above and the display control unit 107 described later. Non-HDR files and HDR files will be described later.
The display control unit 107 reads image data from the frame memory 105 and the frame memory 106 and outputs the image data to the display unit 108. The display unit 108 displays an image based on the input image data. The display control unit 107 outputs predetermined image data (single-color image data in this embodiment) to the display unit 108. Thereby, it is possible to prevent the display unit 108 from displaying an image based on the image data recorded in the frame memory. Note that a display having an electron-emitting device, a liquid crystal display, a plasma display, an organic EL display, or the like may be applied as the display unit 108.

FIG. 2 is a diagram illustrating an example of the configuration of a non-HDR file and an HDR file.
The HDR file 200 is a file necessary for performing HDR display. The HDR file 200 includes a plurality of image data (image data 202 and 203) having different brightnesses. The image data 202 and 203 are data obtained by shooting with different exposure times, for example. Hereinafter, the image data 202 will be described as data obtained by shooting with a short exposure time (dark image data), and the image data 203 will be described as data obtained by shooting with a long exposure time (light image data). The HDR file 200 may include thumbnail image data, appropriate density image data, and the like in addition to a plurality of image data.

  The non-HDR file 206 is a file that does not support HDR display. The non-HDR file 206 includes a single image data 205. The non-HDR file 206 may include thumbnail image data in addition to single image data.

Next, a description will be given of a flow of processing when simultaneously displaying an image by an HDR file and an image by a non-HDR file on one screen in the display device according to the present embodiment.
FIG. 3 illustrates image data written in the frame memory 105 and the frame memory 106 and an image displayed on the display unit 108 when displaying an image based on an HDR file and an image based on a non-HDR file at the same time in this embodiment. It is a figure which shows an example.
FIG. 4 is a flowchart illustrating an example of a flow of processing when simultaneously displaying an image by an HDR file and an image by a non-HDR file in the present embodiment.

  First, in S300, the CPU 104 instructs the display control unit 107 to display two images simultaneously on one screen. Then, as shown at time t1 in FIG. 3, the display control unit 107 operates so that the display unit 108 does not display an image based on the image data recorded in the frame memory. For example, the display control unit 107 outputs image data for displaying a monochrome image such as a black screen or a predetermined image that clearly indicates that processing is being performed on the display unit 108.

  In step S <b> 301, the CPU 104 reads an image file (an image file specified by the user) from the recording unit specified by the user. In step S <b> 302, the CPU 104 determines whether the read image file is the HDR file 200 or the non-HDR file 206.

When the read image file is the HDR file 200 (S302: yes), the CPU 104 writes a plurality of image data included in the HDR file into a plurality of frame memories, respectively.
Specifically, in S <b> 303, the CPU 104 writes the dark image data 202 into the frame memory 105.
In step S <b> 304, the CPU 104 writes the light image data 203 in the frame memory 106. Note that the order of the processing of S304 and the processing of S303 may be reversed.
When the read image file is the non-HDR file 206 (S302: no), the CPU 104 writes single image data included in the non-HDR file to each of the plurality of frame memories.
Specifically, in S305 and S306, the CPU 104 writes the image data 205 in the frame memories 105 and 106, respectively.

After writing processing to the frame memories 105 and 106 (after processing of S303 and S304, or after processing of S305 and S306), in S307, the CPU 104 has written all the image data to be displayed to the frame memories 105 and 106. Determine whether or not. When all the image data to be displayed has not been written in the frame memories 105 and 106 (S307: no), the process returns to S301. When the writing of all the image data to be displayed to the frame memories 105 and 106 is completed (S307: yes), the process proceeds to S308.
Here, in order to display two images simultaneously on one screen, the processing of S301 to S307 is repeated twice. In the example of FIG. 3, the HDR file 200 is read as the first image file. Then, dark image data 202 is written to the frame memory 105 at time t2, and light image data 203 is written to the frame memory 106 at time t3. Thereafter, the non-HDR file 206 is read as the second image file, and the image data 205 is written to the frame memories 105 and 106 at time t4. In the example of FIG. 3, a black screen is displayed until time t3.

  In step S <b> 308, the display control unit 107 reads out all image data written in the frame memory and sequentially outputs the image data to the display unit 108 while sequentially switching a plurality of frame memories. The display unit 108 displays an image based on the input image data. In the example of FIG. 3, image data is alternately read from the frame memories 105 and 106 (time t5 and t6 in FIG. 3). As a result, an image composed of an image based on the dark image data 202 and an image based on the image data 205, and an image composed of an image based on the light image data 203 and an image based on the image data 205 are alternately displayed. In other words, if the frame memory switching described above is performed 120 times per second, for the HDR file 200, an image based on the dark image data 202 and an image based on the light image data 203 are alternately displayed 120 times per second. (HDR displayed). On the other hand, for the non-HDR file 206, the same image (an image based on the image data 205) is repeatedly displayed. As a result, when an image based on the HDR file and an image based on the non-HDR file are simultaneously displayed, the HDR file can be displayed in HDR, and the non-HDR file can be displayed by a general display method.

  In the present embodiment, the case where the HDR file includes two image data has been described. However, the HDR file may include three or more image data. In addition, the number of frame memories included in the display device may be equal to or greater than the number of image data included in the HDR file.

<Example 2>
Next, a display device and a control method thereof according to Embodiment 2 of the present invention will be described. In addition, the same code | symbol is attached | subjected about the structure similar to Example 1, and description is abbreviate | omitted. FIG. 5 is a block diagram illustrating an example of a functional configuration of the display device 400 according to the present embodiment. As shown in FIG. 5, the display device 400 according to the present embodiment has one frame memory 105.

Hereinafter, the flow of processing when simultaneously displaying an image by an HDR file and an image by a non-HDR file in the display device according to the present embodiment will be described. In particular, the functions of the CPU 404 and the display control unit 107 in the display device according to the present embodiment will be described.
FIG. 6 is a diagram illustrating an example of image data written in the frame memory 105 and an image displayed on the display unit 108 when simultaneously displaying an image based on an HDR file and an image based on a non-HDR file in the present embodiment. It is.
FIG. 7 is a flowchart illustrating an example of a flow of processing when simultaneously displaying an image based on an HDR file and an image based on a non-HDR file in the present embodiment.

  First, in S600, the CPU 404 instructs the display control unit 407 to simultaneously display two images on one screen. Then, as shown at time t1 in FIG. 6, the display control unit 407 operates so as not to display an image based on the image data recorded in the frame memory on the display unit.

  In step S <b> 601, the CPU 404 reads an image file (an image file specified by the user) from the recording unit specified by the user. In step S <b> 602, the CPU 404 determines whether the read image file is the HDR file 200 or the non-HDR file 206.

If the read image file is the HDR file 200 (S602: yes), the process proceeds to S603. In step S603, the CPU 404 writes one of a plurality of image data (dark image data 202 in this embodiment) included in the HDR file to the frame memory 105 (time t2 in FIG. 6).
When the read image file is the non-HDR file 206 (S602: no), the process proceeds to S604. In S604, the CPU 404 writes the single image data 205 included in the non-HDR file to the frame memory 105 (time t3 in FIG. 6).

Next, in S605, the CPU 404 determines whether or not all image data to be displayed has been written in the frame memory 105 (S603 or S604). If all the image data to be displayed has not been written in the frame memory 105 (S605: no), the process returns to S601. When the writing of all image data to be displayed to the frame memory 105 is completed (S605: yes), the process proceeds to S606.
Here, in order to display two images simultaneously on one screen, the processing of S601 to S605 is repeated twice. In the example of FIG. 6, the HDR file 200 is read as the first image file. Then, the dark image data 202 is written to the frame memory 105 at time t2. Thereafter, the non-HDR file 206 is read as the second image file, and the image data 205 is written to the frame memory 105 at time t3. In the example of FIG. 6, a black screen is displayed until time t3.

In step S <b> 606, the display control unit 407 reads out all image data written in the frame memory 105 and outputs the read image data to the display unit 108. The display unit 108 displays an image based on the input image data (time t4 in FIG. 6). Specifically, an image composed of an image based on the dark image data 202 and an image based on the image data 205 is displayed.
In step S <b> 607, the CPU 404 counts the number of times an image is displayed based on the image data written in the frame memory 105. In this embodiment, the initial value of the count value (FI) is set to 0. In step S607, 1 is added to the FI value.
Next, in S608, it is determined whether or not to end the image display (for example, whether or not the user has instructed the end of the image display). When the display of the image is not finished (S608: no), the process proceeds to S700.

  In S700, the CPU 404 reads the display target HDR file 200 from the storage unit. In step S701, the CPU 404 determines whether the FI value is an even number. If the FI value is an even number (S701: yes), the process proceeds to S702. If the FI value is an odd number (S701: no), the process proceeds to S703.

In S702, the CPU 404 rewrites the light image data 203 written in the frame memory 105 to the dark image data 202, and proceeds to S606.
In S703, the CPU 404 rewrites the dark image data 202 written in the frame memory 105 to the light image data 203, and the process proceeds to S606.
Since the IF value is an odd number at time t5 in FIG. 6, an image composed of an image based on the light image data 203 and an image based on the image data 205 is displayed in S606.

  As described above, in this embodiment, all the image data written in the frame memory 105 are repeatedly read and displayed. As for the HDR file, among the plurality of image data included in the HDR file, the image data written to the frame memory 105 is sequentially switched in synchronization with the read timing by the display control unit 407. That is, if reading by the display control unit 407 is performed 120 times per second, for the HDR file 200, an image based on the dark image data 202 and an image based on the light image data 203 are alternately displayed 120 times per second. (HDR displayed). On the other hand, for the non-HDR file 206, the same image (an image based on the image data 205) is repeatedly displayed (regardless of the FI value). As a result, when an image based on the HDR file and an image based on the non-HDR file are simultaneously displayed, the HDR file can be displayed in HDR, and the non-HDR file can be displayed by a general display method.

In the present embodiment, the case where the HDR file includes two image data has been described. However, the HDR file may include three or more image data.
In this embodiment, the image data in the frame memory is rewritten according to whether the FI value is an even number or an odd number. However, the method for determining which image data is rewritten is not limited to this. For example, if the HDR file includes three image data, the image data in the frame memory may be rewritten so that images based on the three image data are displayed in order.

As described above, according to the display device and the control method thereof according to the present embodiment, it is possible to simultaneously display an image based on an HDR file and an image based on a non-HDR file on one screen by an appropriate display method. Become.
In the first and second embodiments, a dark image is displayed first when performing HDR display, but the order of images displayed when performing HDR display is not limited to this. For example, a bright image may be displayed first. As long as images with different brightness are alternately displayed, they may be displayed in any order.

  100, 400 ... Display device 104, 404 ... CPU 105, 106 ... Frame memory 107, 407 ... Display control unit

Claims (4)

Multiple frame memories,
Determining means for determining whether the input image file is a first image file including a single image data or a second image file including a plurality of image data having different brightness;
When the first image file is input, the single image data is written to each of the plurality of frame memories, and when the second image file is input, a plurality of images included in the second image file. Writing means for writing the image data to the plurality of frame memories,
Display means for reading and displaying all image data written in the frame memory while sequentially switching the plurality of frame memories;
A display device comprising: Frame memory,
Determining means for determining whether the input image file is a first image file including a single image data or a second image file including a plurality of image data having different brightness;
When the first image file is input, the single image data is written to the frame memory, and when the second image file is input, a plurality of image data included in the second image file are stored. Writing means for writing either of them into the frame memory;
Display means for repeatedly reading and displaying all the image data written in the frame memory;
Have
The writing means, when the second image file is input, out of a plurality of image data included in the second image file, the image data written in the frame memory is read by the display means A display device characterized by switching in order in synchronization. A control method for a display device having a plurality of frame memories,
A determination step of determining whether the input image file is a first image file including a single image data or a second image file including a plurality of image data having different brightnesses;
When the first image file is input, the single image data is written to each of the plurality of frame memories, and when the second image file is input, a plurality of images included in the second image file. A writing step of writing the image data into the plurality of frame memories, respectively.
A display step of reading and displaying all image data written in the frame memory while sequentially switching the plurality of frame memories;
A control method for a display device, comprising: A control method of a display device having a frame memory,
A determination step of determining whether the input image file is a first image file including a single image data or a second image file including a plurality of image data having different brightnesses;
When the first image file is input, the single image data is written to the frame memory, and when the second image file is input, a plurality of image data included in the second image file are stored. A writing step of writing either to the frame memory;
A display step of repeatedly reading and displaying all the image data written in the frame memory;
Have
In the writing step, when the second image file is input, the image data written in the frame memory among the plurality of image data included in the second image file is read in the display step. The display device control method is characterized in that switching is performed in order in synchronization with the display device.

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