JP2015192363A - Image reproducing device, image reproducing method, and program for controlling computer of image reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image reproducing device which prevents a line of sight from wandering when switching an image, an image reproducing method, and a program therefor.SOLUTION: In a first image 41B, a position 50 of a focused main subject image 43 on a display screen 40 is detected. When the first image 41B is switched to a second image, the second image is generated in such a manner that an image portion being present at the position 50 is focused. The generated second image is displayed on the display screen 40. The position of the focused image portion on the display screen 40 is not changed, thereby preventing a line of sight of a user from wandering in image switching.

Description

  The present invention relates to an image reproduction apparatus, an image reproduction method, and a program for controlling a computer of the image reproduction apparatus.

  A camera called a light field camera has been realized. In the light field camera, the image data obtained from the image sensor includes information on the light traveling direction in addition to the light intensity distribution on the light receiving surface. As a result, observation images from a plurality of viewpoints and directions can be reconstructed. In a light field camera, an image in which a desired portion is not blurred can be reconstructed by performing refocusing after imaging. For this reason, there is one in which the focus position is arbitrarily changed after photographing (Patent Document 1). In addition, when displaying a multi-focus continuous shot image, there is one that determines the display time based on the moving distance of the in-focus position (Patent Document 2).

JP 2013-255172 A JP 2011-228814 A

  However, in the invention described in Patent Document 1, it is not considered to sequentially switch and display different images. For this reason, if the focus position on the image plane changes at the time of switching the display image, the viewer will instinctively look for the focus position and the line of sight will wander on the screen, making it difficult to view. Especially when playing slideshows. In Patent Document 1, it is not assumed at all that the naturalness of the reproduction effect is lost by causing unnecessary line-of-sight movement. Moreover, in patent document 2, only the time delay for moving a visual line at the time of image switching is given, and it does not change that a visual line wanders on a screen.

  An object of the present invention is to prevent the line of sight from wandering when switching images.

  The image reproduction apparatus according to the present invention has a first image display control means for displaying a first image on a display screen of a display device, and a focus for detecting a position on the display screen of a portion where the first image is focused. The position detection means and the image portion of the position on the display screen detected by the focus position detection means when the focus image is switched from the first image to the changeable second image and displayed on the display screen. And a second image display control means for displaying the second image on the display screen.

  The present invention also provides an image reproduction method. That is, in this method, the first image display control means displays the first image on the display screen of the display device, and the focus position detection means displays the display screen of the portion in which the first image is in focus. Is detected by the in-focus position detecting means when the second image display control means switches from the first image to the second image in which the in-focus portion can be changed and displayed on the display screen. The second image is displayed on the display screen by focusing the image portion at the position on the display screen.

  The present invention also provides a program for controlling the computer of the image reproducing apparatus. A recording medium storing such a program may be provided.

  The second image display control means, for example, focuses the image portion at the position on the display screen detected by the focus position detection means, and then changes the focused image portion continuously or stepwise. The second image may be displayed on the display screen.

  The second image may further include main subject image determination means for determining whether or not the main subject image exists at a position on the display screen detected by the focus position detection means. In this case, the second image display control means focuses the image portion at the position on the display screen detected by the focus position detection means when the main subject image determination means determines that the main subject image exists. The second image will be displayed on the display screen.

  Main subject image detection means for detecting a main subject image included in the second image may be further provided. In this case, the second display control means focuses the entire second image and displays it on the display screen, for example, when the main subject image is not detected by the main subject image detection means. .

  The first image may be capable of changing the in-focus portion. In that case, for example, the first display control means displays the first image on the display screen while changing the in-focus portion, and the in-focus position detection means changes from the first image to the second image. The position on the display screen of the portion where the first image is in focus immediately before switching and displaying on the display screen will be detected.

  Main subject image detection means for detecting a main subject image included in the second image may be further provided. In this case, the second image display control means, for example, from the focus of the image portion at the position on the display screen detected by the focus position detection means to the main subject image detected by the main subject image detection means. The second image is displayed on the display screen while changing the focused image portion continuously or stepwise.

  Main subject image detection means for detecting a main subject image included in the second image may be further provided. In this case, the second image display control means, for example, focuses on at least one main subject image among the main subject images detected by the main subject image detection means, and the display detected by the focus position detection means. At least one of the display position and display magnification of the second image is changed and displayed on the display screen so that the main subject image is displayed at the position on the screen.

  The second image display control means displays the entire second image on the display screen while maintaining the in-focus state of the main subject image positioned at the position on the display screen detected by the focus position detecting means. Up to this point, at least one of the display position and display magnification of the second image may be changed continuously or stepwise.

  The second image display control means maintains the in-focus state of the position on the display screen detected by the in-focus position detection means, until the entire second image is displayed on the display screen. At least one of the display position and the display magnification may be changed continuously or stepwise.

  You may further provide the imaging device which acquires the image data showing at least one of a 1st image and a 2nd image.

  According to the present invention, the first image is displayed on the display screen, and the position on the display screen of the portion where the first image is in focus is detected. When switching from the display of the first image to the display of the second image, the second image is displayed with the image portion at the detected position in focus. When switching from the first image to the second image, the position of the in-focus portion does not change, so that the line of sight is prevented from wobbling during image switching.

It is a block diagram which shows the electric constitution of a light field camera. This is a file structure of a file in which light field data is stored. The imaging range of an imaging device is shown. The relationship between an attention image and the image of a point light source is shown. It is a flowchart which shows a part of process sequence of a light field camera. It is a flowchart which shows a part of process sequence of a light field camera. It is a flowchart which shows a part of process sequence of a light field camera. It is an example of a 1st image. It is an example of a 1st image. It is an example of a 2nd image. It is an example of a 2nd image. It is a flowchart which shows a part of process sequence of a light field camera. It is an example of a 2nd image. It is a flowchart which shows a part of process sequence of a light field camera. It is an example of a 2nd image. It is an example of a 2nd image. It is a flowchart which shows a part of process sequence of a light field camera. It is an example of a 2nd image.

  FIG. 1 shows an embodiment of the present invention, and is a block diagram showing an electrical configuration of a light field camera (image reproduction apparatus) 1.

  The entire operation of the light field camera 1 is controlled by the CPU 10.

  The light field camera 1 is provided with a user interface 13 such as a switch for outputting a command or the like, a button, an operation device or the like. Commands and the like output from the user interface 13 are given to the CPU 10.

  The light field camera 1 includes an imaging device 4. The imaging device 4 includes an imaging element including a large number of photoelectric conversion elements, a main lens, and a microlens array (all not shown) provided between the main lens and the imaging element. A number of microlenses are formed in the microlens array, and a plurality of photoelectric conversion elements are associated with one microlens. By imaging the subject using such an imaging device 4, the subject can be imaged from a plurality of viewpoint positions, and light field data (multi-viewpoint image data) can be obtained. By performing refocus processing using light field data, an image in which a desired portion is in focus (an image in which the desired image portion is not blurred) can be generated. That is, an image (an image corresponding to the focus plane) obtained when focusing on a desired subject existing in the imaging range can be generated after imaging using the light field data.

  The meaning of focusing will be described with reference to FIGS. As shown in FIG. 3, it is assumed that an ideal point light source 16 is included as a subject within the imaging range of the imaging device 4. In the imaging device 4, incident light from the point light source 16 forms an image at an imaging point via an optical system (not shown), and the imaging point is on the imaging surface of the imaging element of the imaging device 4. The diameter of the image of the point light source 16 on the imaging surface is substantially zero and is smaller than the allowable confusion circle diameter of the imaging device. On the other hand, when the imaging point is not on the imaging surface of the image sensor, the optical image of the point light source 16 is blurred on the imaging surface, and as a result, the diameter of the image of the point light source 16 on the imaging surface is larger than the permissible circle of confusion. Can grow. When the diameter of the image of the point light source 16 on the imaging surface is less than or equal to the permissible circle of confusion, the subject as the point light source 16 is in focus on the imaging surface, and the diameter of the image of the point light source 16 on the imaging surface is When the diameter is larger than the permissible circle of confusion, the subject as the point light source 16 is not focused on the imaging surface.

  Similarly, as shown in FIG. 4, when the image 16A of the point light source 16 is included in the target image 17 as the subject image, the diameter of the image 16A is equal to or less than the reference diameter corresponding to the allowable circle of confusion circle. At some point, the subject as the point light source 16 is in focus in the target image 17, and when the diameter of the image 16A is larger than the reference diameter, the subject as the point light source 16 is not in focus in the target image 17. When a certain subject is located within the depth of field of the target image 17 (when the subject distance of a certain subject belongs to the depth of field of the target image 17), the subject is focused on the target image 17 This is the subject (the focused image part). When a subject is not located within the depth of field of the target image 17 (when the subject distance of the subject does not belong to the depth of field of the target image 17), the subject is inconsistent on the target image 17. It is a focused subject (image portion that is out of focus and blurred).

  Returning to FIG. 1, the light field data output from the imaging device 4 is recorded in an external memory (recording medium) 5 such as a memory card under the control of the memory control device 7. From the light field data, data representing the phase difference is obtained for each pixel, and the distance to the subject can be calculated from the data representing the phase difference.

  The light field camera 1 shown in FIG. 1 also has a playback function. When the reproduction mode is designated by the user interface 13 and an image to be reproduced is designated, light field data corresponding to the designated image is read from the external memory 5. The read light field data is subjected to refocus processing in the refocus arithmetic unit 11. By the refocus processing, image data representing an image in which a subject existing at a predetermined distance is in focus is obtained. An image represented by the image data obtained by the refocus processing is displayed on the display screen of the display device 9 by the graphic processor 8. Of course, it is needless to say that an image obtained by focusing on a subject existing at a predetermined distance may not be displayed, but an image obtained by focusing on another subject may be displayed. Further, the image analysis device 6 detects a specific subject (person, face, animal, building, etc.) included in the image, and displays an image in which the detected specific subject is focused. Also good. Further, the light field data can focus on a desired portion and can change the portion to be focused.

  The light field camera 1 also includes a network interface 2 for connection to the Internet and the like, a RAM 3 for temporarily storing data, a memory 14, a timer 15, and the like. When a program for controlling operations described later is stored in the external memory 5, the program may be read from the external memory 5 and installed in the light field camera 1. Further, such a program may be received by the light field camera 1 via a network and installed in the light field camera 1. Of course, a playback apparatus having no camera function may be made to perform an operation described later.

  FIG. 2 is an example of a file structure (data structure) of a file recorded in the external memory 5.

  The file includes a header area and an image data recording area. Data for managing files is recorded in the header area. The light field data described above is recorded in the image data recording area.

  5 to 7 are flowcharts showing the playback processing procedure of the light field camera 1.

  The external memory 5 has a plurality of light field images representing a plurality of different subjects (an image represented by light field data, which can focus on a desired part after imaging, can be focused, The light field data representing the image that can create a portion having no symbol is stored. This light field data is obtained by the imaging device 4.

  When a playback mode is set by a mode switch included in the user interface 13 and a desired playback image is selected, light field data (first light field data) representing the selected playback image is displayed by the memory control device 7. It is read from the external memory 5 (step 21). Of the first image represented by the read first light field data, a portion to be focused is determined (step 22). The portion to be focused may be a predetermined portion, or the main subject included in the first image may be detected by the image analysis device 6, and the detected main subject may be focused. When a plurality of main subjects are detected, all the main subjects may be focused, or one of the main subjects may be focused. Further, it may be focused on a face or person detected by face detection or person detection.

  A first image is generated from the first light field data by the refocus arithmetic unit 11 so that the determined portion is in focus (step 23). The generated first image is displayed on the display screen of the display device 9 (step 24).

  FIG. 8 is an example of the first image 41A (first image) displayed on the display screen 40.

  The first image 40A includes main subject images 42, 43 and 44. In the first image 40A, the main subject image 42 is in focus (not blurred), and the main subject images 43 and 44 are blurred. The main subject image 42 is shown as a solid line to show that it is in focus, and the main subject images 43 and 44 are shown as wavy lines to show that it is blurred. In the first image 41A shown in FIG. 8, main subject images 42, 43, and 44 included in the first image 41A are detected, and first of the detected main subject images 42, 43, and 44, , The subject image 42 that is present at the farthest point is determined to be in focus. Of course, it may be specified that the other main subject images 43 or 44 are initially focused, or all the main subject images 42, 43, and 44 are determined to be focused first. Good. Further, it may be determined so that the main subject image existing at the center or the end is first focused.

  The focused portion of the image represented by the first light field data can be changed. For this reason, for example, by designating a desired portion using the touch panel 12, a command for changing the in-focus portion can be given to the light field camera 1. A command for changing the in-focus portion may be given to the light field camera 1 by a method other than the touch panel 12. Further, the in-focus portion may change automatically with the passage of time. Needless to say, the refocus calculation device 11 generates an image with the in-focus portion changed. Here, as shown in the first image 41B (first image) in FIG. 9, it is assumed that the user has designated the main subject image 43 to be in focus. The image portion at the position 50 on the display screen 40 is in focus. In FIG. 9 also, the main subject image 43 is shown by a solid line to show that the main subject image 43 is in focus, and the main subject image 42 is shown to show that the main subject images 42 and 44 are blurred. And 44 are shown as wavy lines.

  If there is a command for changing the in-focus part (YES in step 25), the part designated based on the change instruction is determined as the in-focus part (step 22), and the first image in which that part is in focus 41B is generated by the refocus arithmetic unit 11. As shown in FIG. 9, the first image 41B in which the in-focus portion is changed from the main subject image 42 to 43 is displayed on the display screen 40 under the control of the graphic processor (first image display control means) 8. (Step 24). As described above, when the in-focus portion changes with the passage of time, an in-focus portion change command is generated in the light field camera 1 with the passage of a fixed time, and the in-focus portion is changed in accordance with the change instruction. The light field image is displayed on the display screen 40.

  If there is no command to change the in-focus portion (NO in step 25) and no image switching command is given (NO in step 26), the light field image is displayed on the display screen 40 without changing the in-focus portion. Continue to be done.

  When an image switching command is given from the user interface 13 (YES in step 26), the second light field data is read from the external memory 5 (step 27). Also, the position 50 on the display screen 40 of the portion (main subject image 43) where the first image 41B is in focus is detected by the CPU 10 (focus position detection means) (step 28). The position 50 may have a region as well as the position of a certain point. When there are a plurality of in-focus portions in the first image 41B, the position 50 is based on the main in-focus portion (the in-focus portion including the in-focus portion of the maximum area, the face, the person, etc.). It only has to be decided.

  Subsequently, a second image obtained by focusing the image portion at the position 50 on the display screen 40 detected as described above is generated from the second light field data (step 29). Even if the positions 50 before and after the switching are not completely coincident, it is only necessary to partially coincide. Alternatively, an image portion representing a subject within a predetermined distance from the distance to the subject existing at the position 50 determined as the in-focus portion in the first image 41B may be set as the position 50 in the second image 51A. As shown in FIG. 10, when switched from the first image 41B, a second image 51A in which the position 50 on the display screen 40 of the image portion focused on the first image 41B is focused is displayed. It is displayed on the screen 40 (step 30). The second image 51A includes main subject images 52 and 53. The main subject image 52 is in focus and is represented by a solid line to indicate that it is in focus. On the other hand, the main subject image 53 is blurred, and is shown by a wavy line to show that it is blurred. When switching from the first image 41B to the second image 51A where the in-focus portion can be changed and displayed on the display screen 40, the first image 41B is switched to the second image 51A and displayed on the display screen. The position 50 on the display screen 40 of the immediately focused portion of the first image is detected, and the second image 51A is displayed by focusing the image portion 52 of the position 50 on the detected display screen 40. Will be allowed to.

  The second image 51A can also change the in-focus portion. When there is a command to change the in-focus part (YES in step 31), the in-focus part moves stepwise or continuously from the in-focus part before the change to the in-focus part after the change. For this reason, the distance from the image portion before the change to the focused portion after the change is divided into a plurality of distances (step 32).

  In FIG. 10, it is assumed that the in-focus portion before the change is the main subject image 52, and the in-focus portion after the change given the change command is the main subject image 53. Then, the distance from the in-focus part 52 before the change to the in-focus part 53 after the change is divided into a plurality of positions, and the in-focus positions 50A, 50B and 50C are found. The in-focus position moves continuously (stepwise) to 50, 50A, 50B and 50C.

  First, the in-focus position is moved from position 50 to position 50A (step 33), and a second image in which the image portion at position 50A is in focus is generated from the second light field data (step 34). . A second image in which the image portion at the position 50A is focused is displayed on the display screen 40 (step 35). If the designated portion is not in focus (NO in step 36), it can also be determined based on, for example, the spatial frequency of the image portion (for example, spatial frequency). If it is high, it is in focus, and if the spatial frequency is low, it is out of focus.) The processing from step 33 to step 35 is repeated again. Similarly, the second image in which the image portion at the position 50B is focused is displayed on the display screen 40, and then, as shown in FIG. 11, the image portion (main subject image 53) at the position 50C that is the designated portion. A second image focused on is displayed on the display screen 40. The portion 53 designated in this way comes into focus (YES in step 36). Also in FIG. 11, the main subject image 53 is shown by a solid line to show that the main subject image 53 is in focus, and the main subject image 52 is shown to show that the main subject image 52 is blurred. It is indicated by a broken line.

  Thus, after focusing the image portion 52 at the position 50 on the display screen 40, the second image 51A is displayed on the display screen 40 while changing the focused image portion continuously or stepwise. Will come to be.

  FIG. 12 and FIG. 13 show a modification, in which the main subject image is detected in the second image. FIG. 12 is a flowchart showing a part of the processing procedure when the reproduction mode is set in the light field camera 1, and corresponds to the processing in FIG. In FIG. 12, the same processes as those shown in FIG. 6 are denoted by the same reference numerals. FIG. 13 is an example of a second image displayed on the display screen 40.

  As described above, when there is a command to switch from the first image to the second image (step 26 in FIG. 5), the second light field data is read from the external memory 5 (step 27). Further, the position on the display screen 40 of 41B (see FIG. 9) where the first image is focused is detected (step 28).

  Subsequently, a process of detecting a main subject image from the second image is performed by the image analysis device 6 (main subject image detection means) (step 61). The CPU 10 determines whether or not the main subject image exists in the second image (step 62).

  If the main subject image is not detected from the second image (in the case of non-detection) (NO in step 62), the refocusing calculation device 11 generates a second image with the whole in focus ( Step 64). The graphic processor 8 causes the second image that is entirely focused to be displayed on the display screen 40 (step 30).

  When the main subject image is detected from the second image (YES in step 62), whether or not the main subject image exists at the position 50 on the display screen 40 in the portion where the first image is in focus. The existence is determined by the CPU 10 (main subject image determination means) (step 63). As shown in FIG. 10, when the main subject image (main subject image 52 in FIG. 10) exists at the position 50 (YES in step 63), the image of the main subject image existing at the position 50 A second image in which the portion is focused is generated in the refocus calculation device 11 (step 29). The second light focus image 51A (see FIG. 10) generated in this way is displayed on the display screen 40 (step 30). As shown in the second image 51C in FIG. 13, when the main subject image does not exist at the position 50 (NO in step 63), the second image in which the detected main subject image 53 is in focus. Is generated by the refocus arithmetic unit 11 (step 65). The generated second image is displayed on the display screen 40 (step 30).

  In the above-described embodiment, when the main subject image does not exist at the detected position 50, the second image is generated so that the detected main subject image is in focus. Regardless of whether or not an image exists, an image that focuses from the image portion at the position 50 to the detected main subject image, such as the main subject image 53 included in the second image as shown in FIG. You may make it display a 2nd image, changing a part continuously or in steps. Needless to say, the process from steps 32 to 35 in FIG. 7 may be repeated in order to change continuously or stepwise.

  14 to 16 show still another modification. FIG. 14 is a flowchart showing a part of the processing procedure in the playback mode of the light field camera 1, and corresponds to the processing of FIG. In FIG. 14, the same processes as those in FIG. 6 are denoted by the same reference numerals. 15 and 16 are examples of the second image.

  As described above, the second light field data is read from the external memory 5 (step 27), and the position 50 on the display screen 40 where the first image is in focus is detected (step 28). The main subject image is detected from the second image (step 71), and the display position of the second image on the display screen 40 is such that the detected main subject image is the detected position 50 on the display screen 40. Positioned. The second image thus positioned is displayed on the display screen 40 (step 72). As shown in FIG. 15, the second image 51E includes main subject images 52 and 53, and these main subject images 52 and 53 are detected. Then, the main subject image 53 is positioned at the detected position 50. A part of the second image 51E is displayed on the display screen 40 (second image 51F), and the main subject image 52 is not displayed on the display screen 40 even if the main subject image 52 exists. The subject image displayed at the detected position 50 may be the main subject image 52 instead of the main subject image 53. When there are a plurality of main subject images detected from the second image, the main subject image displayed at the detected position 50 is the largest main subject image, the main subject image close to the center, and the end image. Any main subject image such as a main subject image close to, a face image or a human subject image may be used.

  Thereafter, the second subject image 51E is moved continuously or stepwise until it is displayed on the entire display screen 40 while focusing on the main subject image 53 (step 74). As shown in FIG. 16, the second image 51E in which the main subject image 53 is focused is displayed on the entire display screen 40.

  17 and 18 show still another modification. FIG. 17 is a flowchart showing a part of the processing procedure of the reproduction mode of the light field camera 1 and corresponds to FIG. 6 and FIG. In FIG. 17, the same processes as those shown in FIG. 6 or FIG. FIG. 18 is an example of the second image.

  In the process shown in FIG. 14, the second image 51E is displayed so that the entire second image 51E is displayed while the main subject image 53 existing at the detected position is in focus. 51E has been shifted. On the other hand, in the processing shown in FIG. 17, as shown in FIG. 15, the second image 51E is positioned so that the detected main subject image 53 is positioned at the detected position 50, and the second image 51E is positioned. When the entire image 51E is shifted so as to be displayed on the display screen 40, the detected position 50 does not move, and the image portion at the detected position 50 is focused. The second image is shifted so that the entire image is displayed (step 73A). As shown in FIG. 18, even when the entire second image 51E is displayed, the main subject image 52 that is the image portion at the position 50 is in focus. In this way, the display position of the second image is changed continuously or stepwise until the entire second image 51E is displayed on the display screen 40 while maintaining the focused state of the position 50. May be.

  In the above-described embodiment, the display position of the second image 51E is changed continuously or stepwise, but instead of changing the display position of the second image 51E, the display magnification of the second image 51 is changed. By changing continuously or stepwise, as described above, the second image 51E is displayed on the entire display screen 40 while maintaining the focus state of the main subject image 53 existing at the detected position 50. You may make it do. Further, the display magnification of the second image 51E may be changed so that the image portion existing at the position 50 is in focus.

  In the above-described embodiment, the first image displayed before the second image can focus on a desired portion, but is displayed before the second image. The image (first image) does not necessarily have to focus on a desired portion. Even in such a first image, when the image is switched and the second image is displayed, the position on the display screen of the portion in focus in the first image is detected, and the position The above-described processing can be performed according to the above.

1 Light field camera (image playback device)
4 Imaging device 6 Image analysis device (main subject image detection means)
8 graphic processor (first image display control means, second image display control means)
10 CPU (focus position detection means, main subject image determination means)

Claims (12)

First image display control means for displaying a first image on a display screen of a display device;
A focus position detecting means for detecting a position on the display screen of a portion where the first image is in focus, and switching from the first image to a second image capable of changing a focus portion; Second image display control for displaying the second image on the display screen by focusing the image portion at the position on the display screen, which is detected by the in-focus position detecting means when displaying on the display screen. means,
An image reproducing apparatus comprising: The second image display control means includes:
After the image portion at the position on the display screen detected by the focus position detecting means is focused, the second image is displayed while changing the focused image portion continuously or stepwise. Display on screen,
The image reproduction apparatus according to claim 1. Main object image determination means for determining whether or not a main subject image exists at a position on the display screen detected by the focus position detection means in the second image;
The second image display control means includes:
When the main subject image determination unit determines that the main subject image exists, the image portion at the position on the display screen detected by the focus position detection unit is focused and the second image is converted into the second image. Display on the display screen,
The image reproducing apparatus according to claim 1 or 2. A main subject image detecting means for detecting a main subject image included in the second image;
The second display control means includes:
The main subject image detecting means has not detected the main subject image, so that the entire second image is focused and displayed on the display screen;
The image reproduction apparatus according to claim 1. In the first image, the in-focus portion can be changed,
The first display control means includes:
While changing the in-focus portion, the first image is displayed on the display screen,
The in-focus position detecting means is
Detecting a position on the display screen of a portion where the first image is focused immediately before switching from the first image to the second image and displaying on the display screen;
The image reproducing device according to any one of claims 1 to 4. A main subject image detecting means for detecting a main subject image included in the second image;
The second image display control means includes:
The image portion to be focused is continuously or stepwise from the focus of the image portion at the position on the display screen detected by the focus position detection means to the main subject image detected by the main subject image detection means. Display the second image on the display screen while changing to
The image reproducing device according to any one of claims 1 to 5. A main subject image detecting means for detecting a main subject image included in the second image;
The second image display control means includes:
The main subject image is displayed at a position on the display screen that is focused on at least one main subject image detected by the main subject image detection unit and detected by the focus position detection unit. As described above, at least one of the display position and the display magnification of the second image is changed and displayed on the display screen.
The image reproducing device according to any one of claims 1 to 6. The second image display control means includes:
While maintaining the in-focus state of the main subject image positioned at the position on the display screen detected by the focus position detecting means, the second image is displayed until the entire second image is displayed on the display screen. Changing at least one of image display position and display magnification continuously or stepwise,
The image reproducing device according to claim 7. The second image display control means includes:
Display position and display of the second image until the entire second image is displayed on the display screen while maintaining the focus state of the position on the display screen detected by the focus position detecting means. Changing at least one of the magnification continuously or stepwise,
The image reproducing device according to claim 7. An imaging device that acquires image data representing at least one of the first image and the second image;
The image reproducing device according to claim 1, further comprising: The first image display control means displays the first image on the display screen of the display device,
A focus position detecting means detects a position on the display screen of a portion where the first image is focused;
When the second image display control means switches from the first image to the second image whose focus portion can be changed and displayed on the display screen, the focus position detection means detects the second image display control means. Focusing the image portion at the position on the display screen to display the second image on the display screen;
Image playback method. A computer-readable program for controlling a computer of an image reproduction device,
Displaying the first image on the display screen of the display device;
Detecting the position on the display screen where the first image is in focus;
When the first image is switched to the second image whose focus portion can be changed and displayed on the display screen, the detected image portion at the position on the display screen is focused and the second image is displayed. A program for controlling the computer of the image reproducing apparatus to display the image on the display screen.

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