JP7563902B2 - Image selection and display system - Google Patents

Description

The present invention relates to an image selection and playback system for displaying image data consisting of moving images or still images on a display screen with different vertical and horizontal aspect ratios, and in particular to an image selection and playback system that, when the display screen is switched between portrait and landscape orientation, enhances the visual effect by switching between different image data in which each image is related to the other images and displaying them on the display screen, and enhances user comfort by accurately synchronizing the display/playback timing of the image data.

Conventionally, in order to enjoy videos and games using portable devices such as smartphones, tablet terminals, and portable game consoles, technologies have been developed to improve the display method of images consisting of videos and still images, and various technologies have been developed and used to improve the video display method, making it possible to give games a story-like quality and increase the realism of the video. In particular, in these days when there are many opportunities to enjoy videos and games using portable electronic devices such as smartphones, tablet terminals, and portable game consoles, there is a demand for maximizing the entertainment effect on screens with small display areas.

Usually, when a user enjoys an image or game with a story, an image seen from a specific viewpoint is displayed on the screen one way, and the user enjoys watching it. However, the user can only see the story in the image that they have set and cannot know if there is another story unfolding in the background. If the user could view other stories that are being prepared and progressing simultaneously at any time, they would make new discoveries every time they look at an image and be able to enjoy a different story, expanding the scope of enjoyment.

Furthermore, even if the image is the same, screens with different aspect ratios will result in areas that are not displayed and the user cannot see them. However, there may be areas where hidden messages are found in the not-displayed areas that hold the key to understanding the story or solving the game, and if the image can be switched so that these points are visible, the ways in which images can be enjoyed will be expanded.

For example, JP 2019-51360 A discloses a technology for switching images displayed during a game. This technology controls the content displayed on the screen, and discloses a technology for a game program that switches the aspect ratio of the field of view of a virtual camera placed in a virtual space between a first vertical aspect ratio and a second horizontal aspect ratio in accordance with the detection results of a tilt sensor, and displays on a display an image in which parts are superimposed in positions that satisfy predetermined conditions in a first captured image taken by the virtual camera in the first aspect ratio and a second captured image taken in the second aspect ratio. It is suggested that this configuration makes it possible to prevent the user from feeling uncomfortable even when the display mode is switched.

This technology does indeed make it possible to switch between display modes for images with different aspect ratios, but there is a major problem with only controlling the shooting position within the same virtual space: for example, when playing back images from different locations at the same time, the user feels uncomfortable if a time lag occurs.

JP 2019-140568 A discloses a technology relating to an image processing device that acquires a panoramic image and generates a video based on the panoramic image, in which a video generating means sequentially moves the position of a cropping area when cropping the panoramic image, generates a video in which a plurality of cropped images are sequentially played back, and switches between cropping the panoramic image at a predetermined aspect ratio or cropping the panoramic image at an aspect ratio different from the predetermined aspect ratio depending on the aspect ratio of the panoramic image or the size in a predetermined direction. It is disclosed that this technology makes it possible to generate good-looking videos by generating videos according to the situation.

This technology certainly makes it possible to efficiently switch the image displayed on the screen to another image at any timing, and it is thought that this will eliminate the discomfort felt by the user due to a discrepancy in the timing of the switching. However, there is a problem in that it is difficult to prevent the discrepancy when the base images are different. Furthermore, even if the timing of the image switching is left up to the user, there is a major problem in that the display timing of the images can become discrepant as switching is repeated, making it difficult for users to enjoy switching images at their own timing.

There is a strong demand for creative image display methods and increased realism in images, especially in today's world where there are many opportunities to enjoy videos and games using smartphones, tablet devices, portable game consoles, etc. Therefore, there has been a demand for the development of an image selection and display system that allows the display of separate image data with different vertical and horizontal aspect ratios to be switched between, making information that could not be recognized on one screen visible by switching images, enhancing the entertainment effect, and synchronizing images to prevent discrepancies in the display timing when switching.

JP 2019-51360 A JP 2019-140568 A

In order to solve the above problems, the present invention aims to provide an image selection and playback system for displaying image data consisting of moving images or still images on a display screen with different vertical and horizontal aspect ratios, and in particular, to provide an image selection and playback system that enhances the visual effect and entertainment effect by switching between different image data whose contents are related to each other and displaying them on the display screen when the display screen is switched between portrait and landscape orientations, and eliminates any sense of discomfort felt by the user and increases comfort by accurately synchronizing the display/playback timing of the image data.

In order to achieve the above object, the image selection display system according to the present invention displays image data consisting of moving images or still images with different aspect ratios on an image display device, comprising: a first image data output means for outputting first image data that is horizontally long in the left-right direction and has a large horizontal aspect ratio; a second image data output means for outputting second image data that is vertically long in the up-down direction and has a large vertical aspect ratio; an audio playback means for playing audio data associated with the first image data and/or the second image data; a display screen for displaying image data transmitted from either the first image data output means or the second image data output means; The image data selection means selects the image data to be displayed on the display screen, and a synchronization means synchronizes the images output from the first image data output means and the second image data output means. The image data selection means selects either the image data output from the first image data output means or the second image data output means and transmits it to the display screen to display it on the display screen. The synchronization means comprises an error detection means that detects an error in the output timing between the first image data and the second image data, an error measurement means that measures the error in the output timing between the first image data and the second image data, and a correction means that corrects the detected and measured error in the output timing between the first image data and the second image data.

The error detection means detects an error in output timing between the active image data selected by the image data selection means from either the first image data or the second image data and the non-selected non-active image data, and the error measurement means measures the amount of the error and recognizes the occurrence of an error when a certain amount of error is measured, and the correction means corrects the output timing of the non-selected non-active image data to match the selected active image data, depending on the image data error that has occurred, for the first image data output means or the second image data output means.

In addition, when the image data is a moving image, the correction means is configured to correct the output timing of the inactive image data to match that of the selected active image data by performing one or more of the following processes on the inactive image data: frame forward, frame rewind, frame selection, and pausing.

In addition, when the image data selection means receives an image data selection signal selecting different image data, it transmits the newly selected image data output from the first image data output means or the second image data output means to the display screen in place of the currently selected image data.
The image display device is preferably a smartphone, a portable game machine, or a tablet-type portable terminal.

Furthermore, the image data selection means is composed of an angle measurement sensor that detects the angle of the smartphone, portable game machine, or tablet-type mobile terminal, and the image data selection signal is composed of a signal that indicates a change in the installation angle of the smartphone body, portable game machine body, or tablet-type mobile terminal body by the angle measurement sensor, and when the image data selection means detects an image data selection signal indicating that the image display device is oriented horizontally, it selects the image data output by the first image data output means and transmits and displays it on the display screen, and when the image data selection means detects an image data selection signal indicating that the image display device is oriented vertically, it selects the image data output by the second image data output means and transmits and displays it on the display screen.

The present invention has the configuration as described above in detail and thus has the following effects.
1. By providing the first image data output means and the second image data output means, images with different aspect ratios can be selected and displayed under predetermined conditions. In addition, the image data selection means appropriately selects which of the first image data output means and the second image data output means will output an image, making it possible to quickly switch between images. In addition, by providing the synchronization means, it becomes possible to synchronize the images output by the first image data output means and the second image data output means, and it becomes possible to prevent and correct deviations in image display caused by delays in task execution, etc.
2. Since the synchronization means is configured to include an error detection means, an error measurement means, and a correction means, it becomes possible to accurately calculate the degree of the detected deviation and then correct it to achieve synchronization.

3. The correction means is configured to correct inactive image data by frame forwarding, frame rewinding, frame designation, or pausing to achieve synchronization, so the user will no longer be aware of the occurrence of a misalignment, and will be able to comfortably switch between images and enjoy them.
4. Since the image data selection means is configured to perform processing for switching images when it receives an image data selection signal, the user can switch the displayed image at any timing.

5. The image display device is a smartphone, a portable game machine, or a tablet-type portable terminal, so it is possible to switch and display images on compact display screens with different vertical and horizontal aspect ratios.

6. The image data selection means is an angle measurement sensor that detects an angle, so that an image data selection signal can be automatically generated when the installation angle of the image display device is changed. This allows the user to select and switch the image to be displayed by rotating the image display device at any time, and transmit and display the image on the display screen.

The image selection and display system according to the present invention will be described in detail below with reference to the embodiment shown in the drawings. Fig. 1a is a schematic diagram of the image selection and display system according to the present invention, and Fig. 1b is a schematic diagram of an image selection and display system in which the storage means is arranged externally. Fig. 2a is a schematic diagram of an image display device in which the image selection and display system is incorporated, and Fig. 2b is a schematic diagram of an image display device in which the storage means is arranged externally. Fig. 3a is a diagram showing an example of the operation of the synchronization means, and Fig. 3b is a diagram showing the synchronization process. Fig. 4a is a diagram showing an embodiment of the image selection and display system in the landscape screen, and Fig. 4b is a diagram showing an embodiment of the image selection and display system in the portrait screen.

The image selection and display system 1 according to the present invention is a system incorporated in an image display device 100 consisting of a portable device such as a smartphone, a portable game machine, or a tablet-type portable terminal, and as shown in FIG. 1a or 1b, the system is made up of a first image data output means 10, a second image data output means 20, an audio playback means 30, a display screen 40, an image data selection means 50, and a synchronization means 60, and is a system for selecting and displaying images, which enhances the visual effect and the entertainment effect by selecting and displaying image data on the display screen 40 in response to changes in the vertical and horizontal angles when viewing the image display device 100 equipped with the display screen 40, and which makes it possible to eliminate discomfort to the user and increase comfort by the synchronization means 60 precisely synchronizing the display/playback timing of the image data.

The image data displayed on the display screen 40 by the image selection and display system 1 according to the present invention mainly consists of moving images but also includes still images, and is configured to display moving images (or still images) with different vertical and horizontal aspect ratios while switching between them on the display screen 40. The synchronization means 60 is configured to adjust the display timing of the moving images (or still images). The image data to be switched may all be moving images (or still images), or may be a mixture of moving images and still images, with some being moving images and the others being still images. Furthermore, displaying an image in this embodiment naturally includes playing back moving images.

In addition, in this embodiment, active image data refers to image data that has been selected by the image data selection means 50 and is currently being displayed (played) on the display screen 40, while inactive image data refers to image data that has not been selected by the image data selection means 50, is not being displayed on the display screen 40, and is undergoing display (play) processing in the background.

The image display device 100 incorporating the image selection display system 1 has a display screen 40. In this embodiment, the display screen 40 has a different aspect ratio, and the image selection display system 1 is configured to display image data consisting of moving images (or still images) on the display screen 40 of the image display device 100, as shown in Figures 1a and 2a. In this embodiment, the image display device 100 is equipped with a storage means 70, and a calculation device (not shown) reads out various data such as image data and audio data 32 stored in the storage means 70 and performs calculation processing. However, this configuration is not limited to this, and for example, as shown in Figures 1b and 2b, the storage means 70 can be placed in a remote location, and various data such as image data and audio data 32 stored in the storage means 70 can be transmitted to the image display device 100 by wireless or wired communication via a network or communication device (including a relay device), and the data can be processed and displayed by a calculation device via a relay means 80 provided in the image display device 100. Alternatively, moving images captured by multiple imaging devices (not shown) can be live-streamed to the image display device 100 via a network.

In this embodiment, the image display device 100 is configured as a smartphone 110a, a portable game machine 110b, or a tablet-type portable terminal 110c, as shown in Figure 2a or Figure 2b, but is not limited to this, and it is possible to appropriately select and use portable electronic devices having display screens 40 with different vertical and horizontal aspect ratios.

The first image data output means 10 is a means for outputting the first image data 12. As shown in FIG. 4a, the first image data 12 is image data in a form corresponding to a display area consisting of a horizontally elongated rectangle with a large horizontal aspect ratio and widened in the left-right direction, and as shown in FIG. 1a or 1b, the first image data output means 10 reads the first image data 12 and outputs it to be displayed on the display screen 40.

The first image data 12 may be prepared as image data with a large horizontal aspect ratio, which is output as is by the first image data output means 10 and displayed on the display screen 40, or it may be prepared as original image data larger than the display size that the display screen 40 can display, and the first image data output means 10 may cut out any portion of the image data that can be displayed on the display screen 40 and output it as the first image data 12, which is then displayed on the display screen 40.

The second image data output means 20 is a means for outputting the second image data 22. As shown in FIG. 4b, the second image data 22 is image data in a form corresponding to a display area consisting of a vertically elongated rectangle with a large vertical aspect ratio, and as shown in FIG. 1a or 1b, the second image data output means 20 reads the second image data 22 and outputs it to be displayed on the display screen 40.

The second image data 22 may be prepared as image data with a large vertical aspect ratio, which is output as is by the second image data output means 20 and displayed on the display screen 40, or it may be prepared as original image data larger than the display size that the display screen 40 can display, and the second image data output means 20 may cut out any part of the image data that can be displayed on the display screen 40 and output it as the second image data 22, which is then displayed on the display screen 40.

In this embodiment, the first image data 12 and the second image data 22 are composed of video files such as MPEG4 and Motion Jpeg, or image files such as JPEG, and the first image data output means 10 and the second image data output means 20 are composed of software (modules) capable of playing video files such as MPEG4 and Motion Jpeg, or software capable of displaying image files. In addition, each file is stored in a storage means 70 disposed in the image display device 100 or in a remote location, and is called up by a calculation device (not shown) of the image display device 100 to perform playback display processing, but this configuration is not limited to this, and the first image data 12 and the second image data 22 may be in other data formats, and the display of the first image data 12 and the second image data 22 by the first image data output means 10 and the second image data output means 20 may be performed by an independent application or an independent device. In addition, it is also possible to configure the video images captured by multiple imaging devices (not shown) to be live-streamed to the image display device 100 via a network.

The audio playback means 30 is a means for playing back audio data 32 associated with the first image data 12 and/or the second image data 22, and in this embodiment, as shown in FIG. 1a, is configured to call up and play back audio data 32 stored in storage means 70. Note that, as shown in FIG. 1b, the audio data 32 can also be stored in a storage means 70 located at a remote location and then called up, and audio associated with moving images captured by multiple image capture devices (not shown) can also be live-streamed to the image display device 100 via a network.

In this embodiment, the audio data 32 is managed as a separate file from the first image data 12 and the second image data 22, and when the first image data 12 and the second image data 22 are moving images, the audio playback means 30 operates at the same time as the first image data 12 or the second image data 22 is displayed and played back, and plays an audio file provided separately from the moving image file. When the first image data 12 or the second image data 22 is a still image, the audio playback means 30 plays an audio file provided separately from the still image file when the image data is displayed. However, this configuration is not limited to the above, and the audio data 32 can also be configured such that when the first image data 12 and the second image data 22 are moving images, the audio playback means 30 plays the audio data included in the moving image file.

The display screen 40 is an output device for displaying image data (first image data 12 or second image data 22) output and transmitted by either the first image data output means 10 or the second image data output means 20, and is configured as a display device equipped on a smartphone or the like having a different aspect ratio of the screen, as shown in FIG. 2a or FIG. 2b. In this embodiment, the display screen 40 is configured as an LCD screen incorporated in the image display device 100, but is not limited to this configuration and may be a dedicated device for image display that is additionally connected to the device.

The image data selection means 50 is a means for receiving two pieces of image data output from the first image data output means 10 and the second image data output means 20 to the display screen 40, selecting one of the pieces of image data that meets certain conditions, and transmitting it to the display screen 40. As shown in FIG. 1a or FIG. 1b, the first image data output means 10 and the second image data output means 20 read out the first image data 12 and the second image data 22, respectively, from the storage means 70 located within the image display device 100 or at a remote location, and pass them to the image data selection means 50. The image data selection means 50 then selects which image data to display on the display screen 40, transmits it to the display screen 40 as active image data, and the display screen 40 displays the image data.

The synchronization means 60 is a means for synchronizing the output of image data output from the first image data output means 10 and the second image data output means 20. When a user uses the image selection display system 1, for example while repeatedly switching between images for a long time, a discrepancy may occur in the output timing of the first image data output means 10 and the second image data output means 20 due to delays in various tasks or the occurrence of execution errors. In this state, if the image data is repeatedly switched, the user will recognize the discrepancy in the output timing between the images, feel uncomfortable, and lose comfort. By synchronizing the output timing of the first image data output means 10 and the second image data output means 20 using the synchronization means 60, it is possible to accurately synchronize the display timing of the image data, thereby increasing the comfort of the user watching.

The basic operation of the image selection display system 1 according to the present invention will be described below. First, the first image data output means 10 and the second image data output means 20 simultaneously start outputting their respective image data, and transmit the first image data 12 and the second image data 22 to the image selection means 50, respectively. Next, the image data selection means 50, which has received each image data, selects the first image data 12 and the second image data 22 as active image data according to conditions determined by the user, which will be described later, and transmits the selected active image data to the display screen 40. Then, the display screen 40, which has received the active image data, is configured to display the image data on the screen. When the above conditions change, the image data selection means 50 switches the currently inactive image data to active image data and selects it, and transmits the selected active image data to the display screen 40 for display. This makes it possible to switch images displayed on the display screen 40 one after another according to conditions determined by the user. The conditions determined by the user will be described later.

As shown in FIG. 1a or 1b, the synchronization means 60 comprises an error detection means 62, an error measurement means 64, and a correction means 66. The error detection means 62 is a means for detecting an error in the output timing between the first image data 12 and the second image data 22.

In this embodiment, as shown in FIG. 3a, the error detection means 62 detects an error in the output timing between the active image data selected by the image data selection means 50 from either the first image data 12 or the second image data 22 and the inactive image data that was not selected.

For example, in the case of moving images, the occurrence of an error in the output timing can be detected by detecting the difference in frame numbers between active moving images (image data) and inactive moving images (image data). In this case, it is preferable that the frame rates are the same, and in the case of moving images with different frame rates, it is possible to obtain in advance the correspondence of frame numbers between frames in which the moving images are synchronized, and determine that an error in the output timing has occurred if an error (deviation) occurs in the correspondence of the frame numbers.

The error measurement means 64 is a means for measuring the error in the output timing of the first image data 12 and the second image data 22. In this embodiment, the error measurement means 64 is configured to measure the amount of error in the output timing of active image data and inactive image data, and then certify the occurrence of an error when a certain amount of error is measured.

In this embodiment, as shown in FIG. 3a, when the error detection means 62 detects an error in the output timing between image data, the error measurement means 64 compares the currently displayed frame numbers of the first image data 12 and the second image data 22 to calculate how far each image data is ahead (behind), and obtains the degree of error numerically.

The correction means 66 is a means for correcting the error in the output timing of the first image data 12 and the second image data 22 detected by the error detection means 62 and measured by the error measurement means 64.

In this embodiment, as shown in Figures 3a and 3b, the correction means 66 is configured to synchronize images by correcting the output timing of the non-selected, inactive image data to match the selected, active image data in accordance with the error in the image data whose occurrence has been confirmed for the first image data output means 10 or the second image data output means 20. With this configuration, it is possible to accurately calculate and numerically obtain the degree of the detected error, and then accurately correct the output timing to synchronize the image data.

In this embodiment, as shown in FIG. 3b, when the image data displayed on the display screen 40 is a moving image, the correction means 66 is configured to correct the output timing of the inactive image data to match the selected active image data by frame-by-frame forwarding, frame-by-frame rewinding, frame-by-frame designation, or pausing the inactive image data (FIG. 3a shows an example of a correction process using frame-by-frame forwarding). That is, the output timing of the image data that is not being viewed by the user is corrected to match the image data that is being viewed by the user. Here, frame-by-frame forwarding is a process of advancing the frames of the image data by an error amount, frame-by-frame rewinding is a process of reversing the frames of the image data by an error amount, frame designation is a process of designating the start frame of the image data, and pausing is a process of temporarily stopping the playback of the image data and waiting a certain period of time until it is resumed. In this embodiment, any of these processes is selected or a combination of processes is performed. This makes it possible to correct the error between the image data that has occurred while the display (playback) of the image data being viewed remains unchanged, and the user can comfortably enjoy switching between images without being aware of the occurrence of a discrepancy.

In this embodiment, the conditions for switching the image data determined by the user are based on the contents of the image data selection signal 120 received by the image data selection means 50. That is, by receiving the image data selection signal 120, the image data selection means 50 selects which of the first image data 12 and the second image data 22 to send to the display screen 40 as active image data. The image data selection signal 120 is signal data that is sent due to a specific operation by the user, and as shown in FIG. 2, when the image data selection means 50 receives the image data selection signal 120, it selects one of the image data output from the first image data output means 10 or the second image data output means 20 according to the contents of the image data selection signal 120, sets it as active image data, and sends it to the display screen 40 in place of the image data displayed on the display screen 40 (or newly if it is not displayed on the display screen 40) according to the type of the image data selection signal 120 (whether the first image data 12 or the second image data 22 was selected), thereby displaying the active image data on the display screen 40.

More specifically, in this embodiment, the image data selection means 50 acquires a signal emitted from an angle measurement sensor 52 that detects changes in the angle of the device itself, which is mounted on the image display device 100, such as a smartphone 110a, a portable game device 110b, or a tablet-type portable terminal 110c, as an image data selection signal 120, and selects which image data to activate.

In this embodiment, the angle measurement sensor 52 is an acceleration sensor mounted on the image display device 100, and the signal emitted from the acceleration sensor is used as the image data selection signal 120, but this is not limited to this, and any sensor that can detect the installation angle of the image display device 100 can be selected and used.

Specifically, as shown in FIG. 4a, when an image data selection signal 120 indicating that the image display device 100, such as the smartphone 110a, the portable game machine 110b, or the tablet-type mobile terminal 110c, is positioned at a landscape angle is acquired, the image data selection means 50 selects the first image data 12 output by the first image data output means 10 as active image data and transmits it to the display screen 40 so that the first image data 12 is displayed on the display screen 40. As a result, the second image data 22 becomes inactive. Also, as shown in FIG. 4b, when an image data selection signal 120 indicating that the image display device 100, such as the smartphone 110a, the portable game machine 110b, or the tablet-type mobile terminal 110c, is positioned vertically, the image data selection means 50 is configured to select the second image data 22 output by the second image data output means 20 as active image data and transmit it to the display screen 40 so that the second image data 22 is displayed. At this time, the first image data 12 becomes inactive.

The above configuration makes it possible to mount the image selection display system 1 on an image display device 100 such as a smartphone 110a, a portable game machine 110b, or a tablet-type portable terminal 110c equipped with an angle measurement sensor 52 consisting of an acceleration sensor or the like, and when enjoying videos or the like on such an image display device 100, it becomes possible to change the angle of the image display device 100 vertically and horizontally, and to display an image on the display screen 40 according to the angle, thereby improving the visual effect seen by the user. It also becomes possible to accurately synchronize the display/playback timing of image data, further improving the comfort of the user enjoying the images.

Schematic diagram of an image selection and display system according to the present invention. Schematic diagram of an image selection and display system in which the storage means is arranged externally. Schematic diagram of an image display device incorporating an image selection display system Schematic diagram of an image display device in which a storage unit is arranged externally. FIG. 2 shows the operation of the synchronization means Diagram showing the synchronization process FIG. 1 shows an embodiment of an image selection and display system for a landscape screen. FIG. 1 shows an embodiment of an image selection and display system for a vertically long screen.

REFERENCE SIGNS LIST 1 Image selection and display system 10 First image data output means 12 First image data 20 Second image data output means 22 Second image data 30 Audio playback means 32 Audio data 40 Display screen 50 Image data selection means 52 Angle measurement sensor 60 Synchronization means 62 Error detection means 64 Error measurement means 66 Correction means 70 Storage means 80 Relay means 100 Image display device 110a Smartphone 110b Portable game device 110c Tablet-type portable terminal 120 Image selection signal

Claims (5)

An image selection and display system (1) for displaying image data consisting of moving images or still images having different vertical and horizontal aspect ratios on an image display device (100),
the first image data output means (10) for outputting first image data (12) that is horizontally long in the left-right direction and has a large horizontal aspect ratio; the second image data output means (20) for outputting second image data (22) that is vertically long in the top-bottom direction and has a large vertical aspect ratio; audio playback means (30) for playing audio data (32) accompanying the first image data and/or the second image data; a display screen (40) for displaying image data (12, 22) transmitted from either the first image data output means or the second image data output means; an image data selection means (50) for selecting image data transmitted from the first image data output means and the second image data output means to be displayed on the display screen; and a synchronization means (60) for synchronizing images output from the first image data output means and the second image data output means,
the image data selection means (50) selects either the image data (12, 22) output from the first image data output means or the second image data output means, transmits the selected image data to the display screen (40), and displays the selected image data on the display screen;
The synchronization means (60) comprises an error detection means (62) for detecting an error in output timing between the first image data and the second image data, an error measurement means (64) for measuring an error in output timing between the first image data and the second image data, and a correction means (66) for correcting the detected and measured error in output timing between the first image data and the second image data,
The error detection means (62) compares active image data selected by the image data selection means (50) from either the first image data (12) or the second image data (22) with non-selected inactive image data to detect an error in output timing between the two, and the error measurement means (64) measures the amount of the error and determines the occurrence of an error when a certain amount of error is measured, and the correction means (66) corrects the first image data output means (10) or the second image data output means (20) to match the output timing of the non-selected inactive image data with the selected active image data in accordance with the image data error that has occurred. The image selection and display system according to claim 1, characterized in that, when the image data is a moving image, the correction means (66) performs one or more of the following processes on the inactive image data: frame forward, frame rewind, frame selection, and pause, thereby correcting the output timing of the inactive image data to match that of the selected active image data. The image selection display system according to claim 1 or 2, characterized in that when the image data selection means (50) receives an image data selection signal (120) for selecting different image data, the image data selection means (50) transmits the newly selected image data output from the first image data output means (10) or the second image data output means (20) to the display screen (40) in place of the currently selected image data. The image selection and display system according to any one of claims 1 to 3, characterized in that the image display device (100) is a smartphone, a portable game machine, or a tablet-type portable terminal. The image data selection means (50) comprises an angle measurement sensor (52) that detects the angle of the smartphone, the portable game machine, or the tablet-type portable terminal,
The image data selection signal (120) is a signal indicating a change in the installation angle of the smartphone body, the portable game machine body, or the tablet type portable terminal body measured by the angle measurement sensor (52),
4. The image selection and display system according to claim 3, wherein, when the image data selection means (50) detects an image data selection signal (120) indicating that the image display device (100) is oriented horizontally, the image data output by the first image data output means (10) is selected, and transmitted to and displayed on the display screen (40); and, when the image data selection means (50) detects an image data selection signal ( 120 ) indicating that the image display device (100) is oriented vertically, the image data output by the second image data output means (20) is selected, and transmitted to and displayed on the display screen (40).

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