JP4534205B2 - Image display device - Google Patents

Description

  The present invention relates to an image display device, and more particularly to an image display device that displays a histogram together with an image.

  Many portable storage devices such as photo viewers and image display devices such as digital cameras have a full-screen display function for displaying an image on the entire display screen. In the case of performing the full screen display, when the user selects an image to be displayed on the full screen, the image display device generates display image data by resizing the original image data according to the size of the display screen. Full-screen display is performed based on the image data.

  For example, when the original image data is data of 1280 × 960 pixels, when the original image data is displayed on a display screen (VGA) having a resolution of 640 × 480 pixels, the original image data is reduced and displayed for display of 640 × 480 pixels. Image data is generated, stored in the cache memory area, and displayed on the display screen. The degree of reduction depends on the resolution of the original image data and the resolution of the display screen.

  Some image display devices extract luminance information from image data and display it as a histogram when displaying on a full screen. When the user confirms the display of the histogram, it is possible to numerically determine whether or not there is a portion that deteriorates the image quality, such as white shadow or blackout. Thereby, for example, it becomes possible to easily confirm whether or not the user has taken an image with an appropriate image quality.

  On the other hand, in such an image display device, the user may enlarge and display a part of the image displayed on the display screen. When performing enlarged display, the image display device causes the user to specify an area to be enlarged, extracts image data from the display image data area corresponding to the designated area, and displays the enlarged image data. Display on the screen. In this enlarged display, the histogram is generally not displayed.

  Alternatively, as disclosed in Japanese Patent Application Laid-Open No. 10-21390 (Patent Document 1), even when an enlarged image is displayed on a display screen, only a technique for displaying a histogram generated during full screen display as it is is available. Did not exist.

However, even though the user wants to confirm the image of a specific area by performing an enlarged display, the displayed histogram is for the entire image generated from the original image data. There was a problem of not becoming.
Japanese Patent Laid-Open No. 10-21390

  Accordingly, the present invention has been made in view of the above problems, and an object of the present invention is to provide an image display apparatus in which a histogram displayed when an image is enlarged and displayed can be used as a reference for user image confirmation.

In order to solve the above problems, an image display device according to the present invention provides:
First display image data generating means for resizing the original image data to generate first display image data;
A first histogram generating means for acquiring a value for each pixel of an expression element of an image expressed from the original image data, and generating a first histogram based on the acquired value of the expression element;
An image is displayed on a display screen based on the first display image data generated by the first display image data generation means, and the first histogram generated by the first histogram generation means is displayed on the display screen. First display means for displaying on
In the image displayed on the display screen, an area designating unit that allows the user to designate an area to be resized,
Second display image data generating means for resizing the image of the area specified by the area specifying means and generating second display image data;
Second histogram generation for acquiring the value of the expression element for the area of the original image data corresponding to the area specified by the area specifying means, and generating a second histogram based on the value of the acquired expression element Means,
Based on the second display image data generated by the second display image data generation means, an image is displayed on the display screen, and the second histogram generated by the second histogram generation means is displayed. Second display means for displaying on the screen;
It is characterized by providing.

In this case, the image display device acquires the value of the expression element of each pixel of the original image data, and associates the coordinates of each pixel of the original image data with the value of the expression element of each pixel. 1st table production | generation means which produces | generates 1 table is further provided,
The second histogram generation means may acquire the value of the expression element in the area of the original image data corresponding to the area specified by the area specifying means from the first table.

Furthermore, the image display device associates the coordinates of each pixel of the first display image data with the coordinates of the pixel in the original image data at a position corresponding to each pixel of the first display image data. A second table generating means for generating the second table;
The second histogram generation means may specify the coordinates of the area of the original image data corresponding to the area designated by the area designation means using the second table.

  Further, the second display image data generating means may resize the designated area in the first display image data to generate the second display image data.

Further, the first display image data generating means generates the first display image data by reducing the original image data,
The second display image data generation means may generate the second display image data by enlarging the image of the area designated by the area designation means.

  Further, original image data storage means for storing the original image data may be further provided.

  The expression element may be luminance.

An image display apparatus control method according to the present invention includes:
Resizing the original image data to generate first display image data;
Obtaining a value for an expression element of an image expressed from the original image data, and generating a first histogram based on the value of the acquired expression element;
Displaying an image on a display screen based on the generated first display image data, and displaying the generated first histogram on the display screen;
In the image displayed on the display screen, allowing the user to specify an area to be resized;
Resizing the image of the designated area to generate second display image data;
Obtaining a value of the expression element for the area of the original image data corresponding to the designated area, and generating a second histogram based on the value of the acquired expression element;
Displaying an image on the display screen based on the generated second display image data, and displaying the generated second histogram on the display screen;
It is characterized by providing.

The program according to the present invention is:
Resizing the original image data to generate first display image data;
Obtaining a value for an expression element of an image expressed from the original image data, and generating a first histogram based on the value of the acquired expression element;
Displaying an image on a display screen based on the generated first display image data, and displaying the generated first histogram on the display screen;
In the image displayed on the display screen, allowing the user to specify an area to be resized;
Resizing the image of the designated area to generate second display image data;
Obtaining a value of the expression element for the area of the original image data corresponding to the designated area, and generating a second histogram based on the value of the acquired expression element;
Displaying an image on the display screen based on the generated second display image data, and displaying the generated second histogram on the display screen;
Is executed by an image display device.

The recording medium according to the present invention is
Resizing the original image data to generate first display image data;
Obtaining a value for an expression element of an image expressed from the original image data, and generating a first histogram based on the value of the acquired expression element;
Displaying an image on a display screen based on the generated first display image data, and displaying the generated first histogram on the display screen;
In the image displayed on the display screen, allowing the user to specify an area to be resized;
Resizing the image of the designated area to generate second display image data;
Obtaining a value of the expression element for the area of the original image data corresponding to the designated area, and generating a second histogram based on the value of the acquired expression element;
Displaying an image on the display screen based on the generated second display image data, and displaying the generated second histogram on the display screen;
A program for causing the image display device to execute is recorded.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the embodiments described below do not limit the technical scope of the present invention.

  FIG. 1 is a block diagram for explaining an internal configuration of an image display apparatus 10 according to the present embodiment. As shown in FIG. 1, the image display apparatus 10 according to the present embodiment includes a control unit 20, a RAM (Random Access Memory) 22, a hard disk 24, and a memory card interface 26. They are connected to each other via a bus 30.

  The control unit 20 includes a memory controller 40, an encoder 42, a decoder 44, a DSP (Digital Signal Processor) 46, a processor 48, and a ROM (Read Only Memory) 50. In the present embodiment, the control unit 20 is configured by a system LSI. Further, the CPU 20 is connected to the display screen 54 via the dedicated bus 52.

  The memory controller 40 controls access to the RAM 22 and the ROM 50. The encoder 42 and the decoder 44 decompress image data compressed and stored in the hard disk drive 24, or compress uncompressed image data and store it in the hard disk drive 24. The DSP 46 performs a process of resizing the image data to reduce or enlarge the image data. The processor 48 performs various processes by reading a program stored in the ROM 50 or the hard disk drive 24 and executing it. In the present embodiment, the display screen 54 is configured by, for example, an LCD (Liquid Crystal Display) having 640 × 480 pixels.

  Further, a memory card 60 is appropriately attached to the image display device 10. Image data stored in the memory card 60 attached to the image display device 10 can be captured by the image display device 10 via the memory card interface 26. Specifically, the image data stored in the memory card 60 is captured by the CPU 20 via the memory card interface 26 and stored in the hard disk 24. On the contrary, the image data stored in the hard disk drive 24 is captured by the CPU 20 and written to the memory card 60 via the memory card interface 26.

  In the present embodiment, the image display apparatus 10 is assumed to be a photo viewer that is a portable storage device, but the image display apparatus 10 can also be configured by a normal personal computer or notebook computer.

  FIG. 2 is a plan view of the image display apparatus 10 according to the present embodiment as viewed from the display screen 54 side. As shown in FIG. 2, on the right side of the display screen 54, there are provided a menu button B10, an OK button B12, and a cancel button B14 that are operated by a user's finger. In addition, an upper movement button B20, a left movement button B22, a right movement button B24, and a lower movement button B26 that are operated by the user with a finger are also provided.

  The menu button B <b> 10 is an operation button for displaying various menu screens on the display screen 54. The OK button B12 is an operation button that is pressed when various settings are made on the menu screen or the like to finally confirm the changed contents. The cancel button B14 is an operation button that is pressed when various settings are made on the menu screen or the like, and the change contents are not finally reflected. The upper movement button B20, the left movement button B22, the right movement button B24, and the lower movement button B26 are operation buttons for moving the cursor to the upper side, the left side, the right side, and the lower side, respectively, on the menu screen.

  3 and 4 are flowcharts for explaining image display processing executed by the image display apparatus 10 according to the present embodiment. This image display process is a process realized by the CPU 20 reading and executing an image display program stored in the ROM 50. Further, in this image display process, the user operates the menu button B10, the OK button B12, and the move buttons B20, B22, B24, and B26 to instruct the image display device 10 to display image data. It is a process that is started.

  In this image display process, first, as shown in FIG. 3, the image display device 10 displays an image list screen on the display screen 54 (step S10). FIG. 5 is a diagram showing an example of the image list screen W10 displayed on the display screen 54 according to the present embodiment. As shown in FIG. 5, a list of image data in the holder designated by the user is displayed on the image list screen W10. The user can arbitrarily specify which holder the image data list is displayed in.

  Next, as shown in FIG. 3, the image display device 10 causes the user to select an image to be displayed on the full screen (step S <b> 12). Specifically, on the image list screen W10 shown in FIG. 5, the user operates the movement buttons B20, B22, B24, and B26 to move the cursor CR10 to an image that the user wants to display on the full screen, Selection is performed by pressing the OK button B12.

  Next, as shown in FIG. 3, the image display device 10 generates display image data based on the original image data of the image selected by the user, and stores the generated display image data in the cache memory area. (Step S14). For example, if the original image data of the image selected by the user is data of 1280 × 960 pixels as shown in FIG. 6, the image display device 10 performs resizing to reduce the original image data, and FIG. Display image data of 640 × 480 pixels as shown is generated. That is, display image data is generated in accordance with the resolution of the display screen 54. In the present embodiment, calculation processing for resizing the original image data is performed by the DSP 46 based on an instruction from the processor 48. The generated display image data is stored in a cache memory area formed in the RAM 22. Note that the reduction / enlargement ratio in resizing is appropriately determined based on the resolution of the original image data and the resolution of the display screen 54. Further, the calculation process for resizing the original image data may be performed by software processing by the processor 48 instead of by the DSP 46 which is hardware.

  Next, as shown in FIG. 3, the image display device 10 acquires the luminance of each pixel of the original image data based on the original image data, and generates an original image luminance table that is a list of the luminances ( Step S16). FIG. 8 is a diagram illustrating an example of the configuration of the original image luminance table TB10 according to the present embodiment. As shown in FIG. 8, the image display device 10 calculates the luminance for each coordinate from the coordinates (X1 = 1, Y1 = 1) to (X1 = 1280, Y1 = 960) of the original image data, The original image luminance table TB10 is generated in association with the coordinates. In this embodiment, YUV information is acquired from the original image data, and the Y value is used as the luminance information. This luminance value is defined by, for example, 256 gradations from 0 to 255. In the present embodiment, the generated original image luminance table TB10 is stored in the hard disk drive 24. Note that the number of data to be held in the original image luminance table TB10 also changes according to the resolution (total number of pixels) of the original image data.

  Next, as illustrated in FIG. 3, the image display device 10 generates a histogram relating to luminance (step S <b> 18). Specifically, the image display device 10 searches the original image luminance table TB10, and examines the luminance from the coordinates (X1 = 1, Y1 = 1) to (X1 = 1280, Y1 = 960) one by one. To 255, the number of pixels each having a luminance is counted. The count result is expressed as a histogram.

  FIG. 9 is a diagram showing an example of the histogram generated at this time. As shown in FIG. 9, in the present embodiment, the horizontal axis indicates luminance (0 to 255), and the vertical axis indicates the number of pixels. When the user refers to this histogram, for example, when the number of pixels with a luminance of 0 is large, it can be determined that the image is a so-called blackened image, and when the number of pixels with a luminance of 255 is large, so-called white It can be determined that the image is a Tobi image. In the present embodiment, the generated histogram is also stored in a cache memory area formed in the RAM 22. In the present embodiment, the histogram is interpreted in a broad sense, and means a distribution map in which the luminance distribution state can be visually recognized.

  Next, as shown in FIG. 3, the image display device 10 displays an image based on the display image data generated in step S <b> 14 on the display screen 54, and also displays the histogram generated in step S <b> 18 on the display screen 54. Thus, full screen display is performed (step S20). FIG. 10 is a diagram showing an example of the full screen display W20 displayed on the display screen 54 according to the present embodiment. As shown in FIG. 10, in the full screen display W20, an image is displayed on the entire surface of the display screen 54, and a histogram HS20 is displayed on the upper left thereof. Specifically, the image display device 10 acquires the display image data generated in step S14 from the cache memory area of the RAM 22, displays an image based on the display image data on the display screen 54, and performs step S18. The histogram generated in the above is acquired from the cache memory area of the RAM 22 and displayed on the display screen 54.

  Next, as shown in FIG. 3, the image display device 10 generates a position correspondence table of images displayed on the display screen 54 (step S <b> 22). FIG. 11 is a diagram showing an example of the configuration of the position correspondence table TB20 according to the present embodiment. As shown in FIG. 11, in the position correspondence table TB20, the correspondence between the coordinates X2 and Y2 of the display image data and the coordinates X1 and Y1 of the original image data corresponding to the coordinates X2 and Y2 of the display image data. The relationship is maintained. In this example, the display image data is 640 × 480 pixels and the original image data is 1280 × 960 pixels, so that one pixel of the display image data corresponds to four pixels of the original image data. It becomes. In other words, the value of one pixel of the display image data is determined by the value of four pixels of the original image data. The generated position correspondence table TB20 is stored in the hard disk drive 24.

  If the resolution of the original image data is different, the configuration of the generated position correspondence table TB20 is also different. For example, when the original image data is 2560 × 1920 pixels, 16 pixels of the original image data correspond to one pixel of the display image data.

  Next, as shown in FIG. 4, the image display apparatus 10 determines whether or not an enlargement designation for enlarging the area designated by the user has been made (step S30). Specifically, as shown in FIG. 10, the display screen 54 displays an image based on the display image data and a cursor CR20. The user operates the movement buttons B20, B22, B24, and B26 to move the cursor CR20 to the area of the image that the user wants to enlarge. After the cursor CR20 is moved to the area to be enlarged, the user presses the OK button B12, and the enlargement designation is made. In the present embodiment, the movement of the cursor CR20 can be moved up, down, left and right in units of one pixel in the display image data. For example, the movement speed of the cursor CR20 is increased by moving in units of two pixels. You can also

  Next, as shown in FIG. 4, the image display device 10 has the coordinates (XT2, YT2) of the upper left corner T and the coordinates (XE2, YE2) of the lower right corner E of the cursor CR20 shown in FIG. To get. These coordinates may be read directly from the position of the cursor CR20, or the coordinates (XT2, YT2) are read from the position of the cursor CR20, and the coordinates (XE2, YE) are calculated from the position of the coordinates (XT2, YT2). You may make it ask.

  Next, as shown in FIG. 4, the image display device 10 generates enlarged image data to be enlarged and displayed on the display screen 54 (step S34). In the present embodiment, the image display device 10 generates enlarged image data using display image data stored in the cache memory area of the RAM 22. Specifically, the image display device 10 enlarges the area surrounded by the coordinates (XT2, YT2) and the coordinates (XE2, YE2) of the display image data to match the resolution of the display screen 54. Enlarged image data is generated. The calculation process for enlarging the display image data is performed by the DSP 46 based on an instruction from the processor 48. The generated enlarged image data is also stored in a cache memory area formed in the RAM 22.

  Note that the enlarged image data is generated using the display image data because it can be processed at a higher speed than the generation using the original image data. However, in order to obtain enlarged image data with higher accuracy, enlarged image data may be generated from the original image data. The calculation process for enlarging the display image data may be performed by software processing by the processor 48 instead of by the DSP 46 that is hardware.

  Next, as shown in FIG. 4, the image display device 10 acquires the position of the original image data corresponding to the enlarged area designated by the user using the position correspondence table TB20, and the brightness from the original image brightness table TB10. Is acquired (step S36). Specifically, the image display device 10 uses the position correspondence table TB20 to store the original image data included in the area surrounded by the coordinates (XT2, YT2) and the coordinates (XE2, YE2) of the display image data. The coordinates (X1, Y1) are specified, and the brightness of the specified coordinates (X1, Y1) is acquired using the original image brightness table TB10. The image display device 10 performs this process for all coordinates (X1, Y1) included in the area surrounded by the coordinates (XT2, YT2) and the coordinates (XE2, YE2) of the display image data.

  In the image display device 10 of the present embodiment, the data items of the position correspondence table TB20 are searched in order from the top, the condition of XT2 ≦ X2 ≦ XE2 is satisfied, and the condition of YT2 ≦ Y2 ≦ YE2 is satisfied. When the X2 coordinate and the Y2 coordinate are detected, the four coordinates (X1, Y1) held corresponding to the coordinates are acquired, and the luminances of these four coordinates are acquired from the original image luminance table TB10. .

  Next, as shown in FIG. 4, the image display device 10 generates a histogram based on the brightness of each coordinate acquired in step S36 (step S38). The process for generating the histogram is the same as that in step S18. In step S38, a histogram for the area to be enlarged is generated. This histogram is also stored in a cache memory area formed in the RAM 22.

  Next, the image display device 10 displays an enlarged image on the display screen 54 (step S40). FIG. 13 is a diagram illustrating an example of an enlarged image display W30 displayed on the display screen 54 according to the present embodiment. As shown in FIG. 13, the image display device 10 reads the enlarged image data generated in step S34 from the cache memory area of the RAM 22, displays an image based on the enlarged image data on the display screen 54, and performs step S38. The histogram generated in the above is read from the cache memory area of the RAM 22 and displayed as the histogram HS30 on the upper left of the display screen 54.

  Next, the image display device 10 determines whether or not the cancel button B14 is pressed (step S42). When the cancel button B14 is not pressed (step S42: NO), the process waits at step S42. On the other hand, when the cancel button B14 is pressed (step S42: YES), the process returns to the above-described step S20, and the display screen 54 is returned to the full screen display.

  As described above, according to the image display apparatus 10 according to the present embodiment, when the enlarged image display W30 is displayed, the histogram HS30 is also displayed corresponding to the enlarged image, so that the user confirms the image. The significance of the histogram HS30 at the time increases. That is, since the histogram HS30 relating to the brightness of the enlarged image region is displayed, the user can determine whether there is white stripes or whether there is blackout in the enlarged image based on the histogram HS30. Can be done appropriately.

  In addition, in the present embodiment, since the histogram HS30 is generated based on the original image data, a luminance histogram can be obtained with extremely high accuracy.

  Furthermore, according to the image display apparatus 10 according to the present embodiment, the original image luminance table TB10 and the position correspondence table TB20 are generated and held in advance before starting the process for displaying the enlarged image. Therefore, the process for generating the histogram HS30 when displaying the enlarged image can be quickly performed. That is, when generating the histogram HS30 of the enlarged image, the image display device 10 acquires the corresponding coordinates of the original image data based on the position correspondence table TB20, and the luminance of the corresponding coordinates is obtained from the original image luminance table TB10. It can be generated just by acquiring. For this reason, there is no need to read the original image data again or to specify the enlarged area in the read original image data and acquire the luminance from there, so that the user does not need to display the histogram HS30 or the enlarged image. The waiting time can be shortened as much as possible.

  In addition, this invention is not limited to the said embodiment, A various deformation | transformation is possible. For example, in the embodiment described above, since the size of the cursor CR20 shown in FIG. 10 is fixed, the enlargement magnification is fixed, but the size of the cursor CR20 can be arbitrarily changed. Thus, the magnification for enlargement may be arbitrarily changed.

  In the above-described embodiment, after the enlarged image display W30 is displayed, the cancel button B14 is pressed to return to the full screen display W20. The enlarged area may be enlarged to display an enlarged image.

  In the above-described embodiment, an example in which the present invention is applied to a histogram relating to luminance has been described. However, the present invention can also be applied to a histogram other than luminance. That is, the present invention may be applied to a histogram of expression elements of an image expressed from original image data such as red, blue, saturation, and brightness.

  In step S14 of the above-described embodiment, the display image data is generated by resizing the original image data. However, the display image data is generated by performing the resizing. Also good. Similarly, in step S34 of the above-described embodiment, the enlarged image data is generated by performing resizing to enlarge the display image data. However, the reduced image data is generated by performing resizing to reduce. You may do it.

  In the above-described embodiment, the original image data has been described on the assumption that the original image data is stored in the hard disk drive 24. However, the original image data may be stored in the memory card 60. That is, the storage device that stores the original image data may or may not be built in the image display device 10.

  For the image display process described in the above embodiment, a program for executing this process is recorded on a recording medium such as a flexible disk, a CD-ROM (Compact Disc-Read Only Memory), a ROM, or a memory card. Thus, it can be distributed in the form of a recording medium. In this case, the above-described embodiment can be realized by causing the image display device 10 to read and execute the program recorded on the recording medium.

  Further, the image display apparatus 10 may include other programs such as an operating system and another application program. In this case, in order to utilize another program provided in the image display device 10, a program including an instruction for calling a program that realizes processing equivalent to the above-described embodiment from among the programs provided in the image display device 10 May be recorded on a recording medium.

  Further, such an image display device 10 can be distributed as a carrier wave through a network instead of a recording medium. The program transmitted in the form of a carrier wave on the network is taken into the image display device 10, and the above-described embodiment can be realized by executing this program.

  Also, when a program is recorded on a recording medium or transmitted as a carrier wave on a network, the program may be encrypted or compressed. In this case, the image display apparatus 10 that has read the program from the recording medium or the carrier wave needs to execute the program after decoding or decompressing the program.

  In the above-described embodiment, the image display process is realized by software. However, this can also be realized by hardware such as an ASIC (Application Specific IC). FIG. 14 is a block diagram illustrating a configuration of the image display device 10 when the image display processing is realized by hardware.

  As shown in FIG. 14, the image display apparatus 10 includes a first display image data generation unit 100, a first histogram generation unit 102, a first display unit 104, an area designation unit 106, and a second display display. The image data generation unit 108, the second histogram generation unit 110, the second display unit 112, the display screen 54, the hard disk drive 24, and the RAM 22 are configured. Further, the image display device 10 may include components other than those illustrated.

  The first display image data generation unit 100 acquires original image data from the hard disk drive 24 which is an example of a storage device, resizes the original image data, and generates first display image data. The first display image data generated here is generated with the number of pixels matching the resolution of the display screen 54. The generated first display image data is stored in the cache memory area of the RAM 22.

  The first histogram generation unit 102 acquires a value for an expression element of an image expressed from the original image data for each pixel, and generates a first histogram based on the acquired expression element value. The expression element of the image expressed from the original image data is, for example, luminance.

  The first display unit 104 performs full-screen display on the display screen 54 based on the first display image data generated by the first display image data generation unit 100 and is generated by the first histogram generation unit 102. The first histogram is displayed on the display screen 54. An example of the full screen display W20 displayed by the first display unit 104 is the above-described FIG.

  The area specifying unit 106 allows the user to specify an area to be resized in the image displayed on the display screen 54. For example, in FIG. 10 described above, the user specifies a region to be resized using the cursor CR20.

  The second display image data generation unit 108 resizes the image in the area designated by the area designation unit 106 to generate second display image data. The resolution of the second display image data generated here is also generated in accordance with the resolution of the display screen 54. The generated second display image data is stored in the cache memory area of the RAM 22.

  The second histogram generation unit 110 acquires the expression element value for the area of the original image data corresponding to the area specified by the area specifying unit 106, and generates the second histogram based on the acquired expression element value. To do. The value of the expression element is, for example, luminance.

  The second display unit 112 displays an image on the display screen 54 based on the second display image data generated by the second display image data generation unit 108 and also generates the second display generated by the second histogram generation unit 110. 2 A histogram is displayed on the display screen 54.

  Further, the image display apparatus 10 may include a first table generation unit 114 and a second table generation unit 116.

  When the image display apparatus 10 includes the first table generation unit 114, the first table generation unit 114 acquires the value of the expression element of each pixel of the original image data, and the coordinates of each pixel of the original image data; An original image luminance table TB10 in which the value of the expression element of each pixel is associated is generated. The generated original image luminance table TB10 is stored in the hard disk drive 24.

  Then, the second histogram generation unit 110 described above acquires the value of the expression element in the area of the original image data corresponding to the area specified by the area specifying unit 106 from the original image luminance table TB10.

  The second table generation unit 116 associates the coordinates of each pixel of the first display image data with the coordinates of the pixel in the original image data at the position corresponding to each pixel of the first display image data. A correspondence table TB20 is generated. The position correspondence table TB20 is stored in the hard disk drive 24.

  Then, the second histogram generation unit 110 specifies the coordinates of the region of the original image data corresponding to the region specified by the region specifying unit 106 using the position correspondence table TB20.

  The second display image data generation unit 108 uses the first display image data stored in the cache memory area of the RAM 22 to resize the designated area in the first display image data. Second display image data may be generated.

  The first display image data generation unit 100 reduces the original image data to generate first display image data, and the second display image data generation unit 108 is designated by the region designation unit 106. The image of the area may be enlarged to generate the second display image data.

FIG. 3 is a block diagram illustrating an example of a main internal configuration of the image display apparatus according to the present embodiment. The top view which looked at the image display apparatus of FIG. 1 from the display screen side. The figure which shows the flowchart explaining the content of the image display process which concerns on this embodiment (the 1). FIG. 9 is a second flowchart illustrating the content of image display processing according to the present embodiment. The figure which shows an example of the image list screen displayed on a display screen. The figure explaining an example of the resolution of original image data. The figure explaining an example of the resolution of the image data for a display. The figure which shows an example of a structure of the original image brightness | luminance table which the image display apparatus which concerns on this embodiment produces | generates. The figure which shows an example of the histogram for a full screen display which the image display apparatus which concerns on this embodiment produces | generates. The figure which shows an example of the full screen display displayed on a display screen. The figure which shows an example of a structure of the position corresponding table which the image display apparatus which concerns on this embodiment produces | generates. The figure explaining the coordinate position of the area | region which the user designated in full screen display. The figure which shows an example of the enlarged image display displayed on a display screen. The figure which shows an example of the main internal structures of the image display apparatus in the case of implement | achieving image display processing by hardware.

Explanation of symbols

10 Image display device 20 Control unit 22 RAM
24 hard disk drive 26 memory card interface 30 internal bus 40 memory controller 42 encoder 44 decoder 46 DSP
48 processor 50 ROM
52 Dedicated bus 54 Display screen 60 Memory card

Claims (9)

First display image data generating means for resizing the original image data to generate first display image data;
A first histogram generating means for acquiring a value for an expression element of an image expressed from the original image data for each pixel, and generating a first histogram based on the acquired expression element value;
An image is displayed on a display screen based on the first display image data generated by the first display image data generation means, and the first histogram generated by the first histogram generation means is displayed on the display screen. First display means for displaying on
In the image displayed on the display screen, an area designating unit that allows the user to designate an area to be resized,
Second display image data generating means for resizing the image of the area specified by the area specifying means and generating second display image data;
Second histogram generation for acquiring the value of the expression element for the area of the original image data corresponding to the area specified by the area specifying means, and generating a second histogram based on the value of the acquired expression element Means,
Based on the second display image data generated by the second display image data generation means, an image is displayed on the display screen, and the second histogram generated by the second histogram generation means is displayed. Second display means for displaying on the screen;
Provided with a,
The value of the expression element of each pixel of the original image data is acquired, and a first table is generated in which the coordinates of each pixel of the original image data are associated with the value of the expression element of each pixel. Table generating means;
A second table is generated in which the coordinates of each pixel of the first display image data are associated with the coordinates of the pixel in the original image data at a position corresponding to each pixel of the first display image data. Second table generating means;
Further comprising
The second histogram generation means acquires the value of the expression element in the area of the original image data corresponding to the area designated by the area designation means from the first table, and is designated by the area designation means. Specifying the coordinates of the area of the original image data corresponding to the area using the second table;
An image display device characterized by that. The image display apparatus according to claim 1, wherein the first display image data generation unit resizes the original image data in accordance with a resolution of the display screen. It said second display image data generation means, the resize the designated region in the first display image data, to generate the second display image data, it claim 1 or, wherein Item 3. The image display device according to Item 2 . The first display image data generating means generates the first display image data by reducing the original image data,
The second display image data generating means generates the second display image data by enlarging the image of the area specified by the area specifying means;
The image display apparatus according to any one of claims 1 to 3, characterized in that. The image display apparatus according to any one of claims 1 to 4, characterized in the original image data storage means for said original image data is stored, further comprising. The expression elements image display apparatus according to any one of claims 1 to 5, characterized a luminance, that. Resizing the original image data to generate first display image data;
Obtaining a value for an expression element of an image expressed from the original image data, and generating a first histogram based on the value of the acquired expression element;
Displaying an image on a display screen based on the generated first display image data, and displaying the generated first histogram on the display screen;
In the image displayed on the display screen, allowing the user to specify an area to be resized;
Resizing the image of the designated area to generate second display image data;
Obtaining a value of the expression element for the area of the original image data corresponding to the designated area, and generating a second histogram based on the value of the acquired expression element;
Displaying an image on the display screen based on the generated second display image data, and displaying the generated second histogram on the display screen;
Provided with a,
Obtaining a value of an expression element of each pixel of the original image data, and generating a first table in which the coordinates of each pixel of the original image data and the value of the expression element of each pixel are associated with each other;
A second table is generated in which the coordinates of each pixel of the first display image data are associated with the coordinates of the pixel in the original image data at a position corresponding to each pixel of the first display image data. Steps,
Further comprising
In the step of generating the second histogram, the value of the expression element in the area of the original image data corresponding to the designated area to be resized is acquired from the first table, and the designated area to be resized is obtained. The coordinates of the corresponding area of the original image data are specified using the second table.
And a control method for the image display device. Resizing the original image data to generate first display image data;
Obtaining a value for an expression element of an image expressed from the original image data, and generating a first histogram based on the value of the acquired expression element;
Displaying an image on a display screen based on the generated first display image data, and displaying the generated first histogram on the display screen;
In the image displayed on the display screen, allowing the user to specify an area to be resized;
Resizing the image of the designated area to generate second display image data;
Obtaining a value of the expression element for the area of the original image data corresponding to the designated area, and generating a second histogram based on the value of the acquired expression element;
Displaying an image on the display screen based on the generated second display image data, and displaying the generated second histogram on the display screen;
Is executed by the image display device, and
Obtaining a value of an expression element of each pixel of the original image data, and generating a first table in which the coordinates of each pixel of the original image data and the value of the expression element of each pixel are associated with each other;
A second table is generated in which the coordinates of each pixel of the first display image data are associated with the coordinates of the pixel in the original image data at a position corresponding to each pixel of the first display image data. Steps,
Is a program for causing the image display device to further execute,
In the step of generating the second histogram, a value of the expression element in the area of the original image data corresponding to the designated area to be resized is acquired from the first table, and the designated area to be resized is obtained. A process of specifying the coordinates of the corresponding area of the original image data using the second table,
A program for causing an image display device to execute. Resizing the original image data to generate first display image data;
Obtaining a value for an expression element of an image expressed from the original image data, and generating a first histogram based on the value of the acquired expression element;
Displaying an image on a display screen based on the generated first display image data, and displaying the generated first histogram on the display screen;
In the image displayed on the display screen, allowing the user to specify an area to be resized;
Resizing the image of the designated area to generate second display image data;
Obtaining a value of the expression element for the area of the original image data corresponding to the designated area, and generating a second histogram based on the value of the acquired expression element;
Displaying an image on the display screen based on the generated second display image data, and displaying the generated second histogram on the display screen;
Is executed by the image display device, and
Obtaining a value of an expression element of each pixel of the original image data, and generating a first table in which the coordinates of each pixel of the original image data and the value of the expression element of each pixel are associated;
A second table is generated in which the coordinates of each pixel of the first display image data are associated with the coordinates of the pixel in the original image data at a position corresponding to each pixel of the first display image data. Steps,
Is a recording medium on which a program for causing the image display device to further execute is recorded,
In the step of generating the second histogram, the value of the expression element in the area of the original image data corresponding to the designated area to be resized is acquired from the first table, and the designated area to be resized is obtained. A process of specifying the coordinates of the corresponding area of the original image data using the second table,
A recording medium on which a program for causing an image display device to execute is recorded.

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