Three-dimensional display system, driving circuit and display method

Abstract

The invention provides a three-dimensional display system, a driving circuit and a display method. The three-dimensional display system comprises an eyeball tracking module, a driving circuit and a host device. The eyeball tracking module is configured to generate eyeball tracking data including a scene image and a scene depth map, and perform eyeball detection to output eyeball position data and eyeball depth data. The driving circuit is coupled to the eyeball tracking module and is used for receiving the eyeball position data and the eyeball depth data. The main control device is coupled with the driving circuit and is used for providing original three-dimensional image data. The driving circuit is also used for dynamically adjusting the original three-dimensional image data according to the eyeball position data and the eyeball depth data so as to generate adjusted three-dimensional image data. According to the three-dimensional display system, the driving circuit and the display method, the three-dimensional image can be effectively and dynamically adjusted according to the eyeball position of the user.

Description

Technical Field

[0001] The present invention relates to a display technology, and particularly to a three-dimensional display system, a driving circuit, and a display method. Background Art

[0002] A traditional naked-eye display system can obtain eye position data and eye depth data through a sensor, and provide them to a main control device of an image source to adjust a three-dimensional image through the main control device of the image source. Therefore, when the main control device of the image source of the traditional naked-eye display system provides three-dimensional image data to the naked-eye three-dimensional display to display the adjusted three-dimensional image, a relatively large transmission delay (about 200 milliseconds (ms)) may occur (i.e., because the processing time of the main control device is slower than the frame rate). Summary of the Invention

[0003] The three-dimensional display system of the present invention includes an eye tracking module, a driving circuit, and a main control device. The eye tracking module is used to generate eye tracking data including a scene image and a scene depth map, and perform eye detection to output eye position data and eye depth data. The driving circuit is coupled to the eye tracking module and is used to receive the eye position data and the eye depth data. The main control device is coupled to the driving circuit and is used to provide original three-dimensional image data. The driving circuit is further used to dynamically adjust the original three-dimensional image data according to the eye position data and the eye depth data to generate adjusted three-dimensional image data.

[0004] The driving circuit for driving a three-dimensional display panel of the present invention includes a microcontroller unit and a three-dimensional mapping circuit. The microcontroller unit is used to receive original three-dimensional image data, eye position data, and eye depth data. The three-dimensional mapping circuit is coupled to the microcontroller unit and is used to dynamically adjust the original three-dimensional image data according to the eye position data and the eye depth data to generate adjusted three-dimensional image data. The three-dimensional display panel is further used to display an adjusted three-dimensional image according to the adjusted three-dimensional image data.

[0005] The display method of the present invention includes the following steps: generating eye tracking data including a scene image and a scene depth map through an eye tracking module; performing eye detection through the eye tracking module to output eye position data and eye depth data; receiving the eye position data and the eye depth data through a driving circuit; providing original three-dimensional image data through a main control device; and dynamically adjusting the original three-dimensional image data according to the eye position data and the eye depth data through the driving circuit to generate adjusted three-dimensional image data.

[0006] Based on the above, in the three-dimensional display system, driving circuit and display method according to the present invention, the electronic device can effectively adjust the three-dimensional image dynamically according to the eye position of the user.

[0007] To make the above features and advantages of the present invention more obvious and understandable, specific embodiments are given below and detailed descriptions are provided in conjunction with the accompanying drawings as follows. Description of the Drawings

[0008] Figure 1 is a schematic diagram of a three-dimensional display system according to an embodiment of the present invention;

[0009] Figure 2 is a flowchart of a display method according to an embodiment of the present invention;

[0010] Figure 3 is a schematic diagram of a three-dimensional display system according to an embodiment of the present invention;

[0011] Figure 4 is a timing diagram of multiple operations of a three-dimensional display system according to an embodiment of the present invention;

[0012] Figure 5 is a schematic diagram of a three-dimensional display system according to an embodiment of the present invention;

[0013] Figure 6 is a schematic diagram of a three-dimensional display system according to an embodiment of the present invention.

[0014] Description of the Reference Numerals

[0015] 100, 300, 500, 600: Three-dimensional display system;

[0016] 110, 310, 510, 610: Driving circuit;

[0017] 120, 320, 520, 620: Eye tracking module;

[0018] 121, 321, 521: Processing circuit;

[0019] 122, 322, 522, 622: Image / depth sensor;

[0020] 130, 330, 530, 630: Main control device;

[0021] 140, 340, 540, 640: Three-dimensional display panel;

[0022] 301, 501, 601: Synchronization signal;

[0023] 302, 502, 602: Eye tracking data;

[0024] 303, 503, 603: Eye position data;

[0025] 304, 504, 604: Eye depth data;

[0026] 305, 505, 605: Original three-dimensional image data;

[0027] 306, 506, 606: Adjusted three-dimensional image data;

[0028] 311, 511, 611: Microcontroller unit;

[0029] 312, 512, 612: Three-dimensional mapping circuit;

[0030] 350, 550, 650: Scaling controller;

[0031] S210 - S250: Steps;

[0032] t0 - t12: Time;

[0033] F1, F2: Frame;

[0034] Sync, Texp, Tdta, Talg, Tpso, Din, Dout, Dis: Timing. Detailed implementation

[0035] Reference will now be made in detail to the exemplary embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numerals are used in the drawings and the description to refer to the same or like parts.

[0036] In the description and claims of the present invention, certain terms are used to refer to specific components. Those skilled in the art should understand that electronic device manufacturers may use different names to refer to the same parts. It is not the intention of this document to distinguish between components that have the same function but different names. In the following description and claims, words such as "comprising" and "including" are open-ended terms and should be interpreted as "including but not limited to...".

[0037] The term "coupled (or connected)" used in the description (including the claims) of the present invention may refer to any direct or indirect connection. For example, if the text describes that a first device is coupled (or connected) to a second device, it should be interpreted that the first device may be directly coupled to the second device, or the first device may be indirectly coupled or coupled to the second device through some other device or a certain connection means.

[0038] Figure 1 is a schematic diagram of a three-dimensional display system according to an embodiment of the present invention. Refer to Figure 1, the three-dimensional display system 100 includes a driving circuit 110, an eye tracking module 120, a main control device 130, and a three-dimensional display panel 140. The driving circuit 110 is coupled to the eye tracking module 120, the main control device 130, and the three-dimensional display panel 140. In an embodiment of the present invention, the eye tracking module 120 is configured to detect the user's eyes to obtain corresponding eye information. In an embodiment of the present invention, the eye tracking module 120 includes a processing circuit 121 and an image / depth sensor 122. The processing circuit 121 may be an Application Specific Integrated Circuit (ASIC). The processing circuit 121 may include a depth decoder and an eye tracking operation circuit, and is configured to perform depth decoding operations and eye tracking operations. The eye tracking module 120 is configured to provide corresponding eye information to the driving circuit 110, and the main control device 130 is configured to provide three-dimensional image data to the driving circuit 110.

[0039] In an embodiment of the present invention, the driving circuit 110 is configured to adjust the three-dimensional image data according to the corresponding eye information to generate adjusted three-dimensional image data for the three-dimensional display panel 140. Therefore, the three-dimensional display panel 140 can display a three-dimensional image suitable for the user's current viewing screen.

[0040] In an embodiment of the present invention, the three-dimensional display system 100 may include a naked-eye three-dimensional display device, and the driving circuit 110, the eye tracking module 120, and the three-dimensional display panel 140 may be integrated in the naked-eye three-dimensional display device. In an embodiment of the present invention, the driving circuit 110 may be a display driver or a Timing controller (TCON). The main control device 130 may be a computer device, for example, capable of outputting image streaming of three-dimensional images to the naked-eye three-dimensional display device. The three-dimensional display panel 140 is configured to provide a naked-eye three-dimensional display function.

[0041] Figure 2 is a flowchart of a display method according to an embodiment of the present invention. Refer to Figure 1 and Figure 2, the three-dimensional display system 100 may perform the following steps S210 to S250. In step S210, the eye tracking module 120 may generate eye tracking data including a scene image and a scene depth map. In step S220, the eye tracking module 120 may perform eye detection to output eye position data (i.e., a two-dimensional image) and eye depth data (i.e., depth information) to the driving circuit 110. In an embodiment of the present invention, the eye position data may include left eye position coordinates and right eye position coordinates, and the eye depth data includes a left eye depth value and a right eye depth value. In step S230, the driving circuit 110 may receive the eye position data and the eye depth data. In step S240, the main control device 130 may provide original three-dimensional image data to the driving circuit 110. In an embodiment of the present invention, the original three-dimensional image data may include right image data and left image data.

[0042] In step S250, the driving circuit 110 may dynamically adjust the original three-dimensional image data according to the eye position data and the eye depth data to generate adjusted three-dimensional image data. Therefore, the driving circuit 110 may effectively drive the three-dimensional display panel 140 to display the adjusted three-dimensional image according to the adjusted three-dimensional image data. Therefore, the three-dimensional display panel 140 may display a three-dimensional image suitable for the user's current viewing screen. Moreover, the main control device 130 does not need to receive the eye position data and the eye depth data to process the original three-dimensional image data. That is to say, the computing resources of the main control device 130 can be effectively reduced, and the delay of data transmission between the driving circuit 110 and the main control device 130 can be reduced.

[0043] Figure 3 is a schematic diagram of a three-dimensional display system according to an embodiment of the present invention. Refer to Figure 3 , the three-dimensional display system 300 includes a driving circuit 310, an eye tracking module 320, a main control device 330, a three-dimensional display panel 340, and a scaler 350. The driving circuit 310 is coupled to the eye tracking module 320 and the three-dimensional display panel 340, and is coupled to the main control device 330 through the scaler 350. In an embodiment of the present invention, the eye tracking module 320 is used to detect the user's eyes to obtain corresponding eye information. In an embodiment of the present invention, the driving circuit 310 includes a microcontroller unit (MCU) 311 and a three-dimensional mapping circuit 312. The three-dimensional mapping circuit 312 may be an application-specific integrated circuit. The eye tracking module 320 includes a processing circuit 321 and an image / depth sensor 322. The microcontroller unit 311 is coupled to the processing circuit 321, the three-dimensional mapping circuit 312, and the scaler 350.

[0044] In an embodiment of the present invention, the microcontroller unit 311 of the driving circuit 310 can output a synchronization signal 301 to the processing circuit 321 of the eye tracking module 320 through General-Purpose Input / Output (GPIO) pins, so that the processing circuit 321 controls the image / depth sensor 322 of the eye tracking module 320 to perform an eye tracking operation to generate eye tracking data 302. The eye tracking data 302 includes a scene image and a scene depth map. The processing circuit 321 can analyze the eye tracking data 302 to generate eye position data 303 and eye depth data 304, and the processing circuit 321 can output the eye position data 303 and the eye depth data 304 to the driving circuit 310 through an Inter-Integrated Circuit (I2C) interface or a Serial Peripheral Interface (SPI). In an embodiment of the present invention, the driving circuit 310 outputs the synchronization signal 301 to the processing circuit 321 and receives the eye position data 303 and the eye depth data 304 from the processing circuit 321 through different signal transmission interfaces.

[0045] In an embodiment of the present invention, the main control device 330 provides original three-dimensional image data to the driving circuit 310 through the scaling controller 350. The main control device 330 can be a Personal Computer (PC), and can output the original three-dimensional image data 305 to the scaling controller 350 through a High Definition Multimedia Interface (HDMI). The scaling controller 350 can change the data or signal format of the original three-dimensional image data 305, and can output the original three-dimensional image data 305 to the microcontroller unit 311 through an embedded display port (eDP). In an embodiment of the present invention, the microcontroller unit 311 can provide the original three-dimensional image data 305, the eye position data 303, and the eye depth data 304 to the three-dimensional mapping circuit 312. The three-dimensional mapping circuit 312 can be a data calculation circuit, and is used to dynamically adjust the original three-dimensional image data 305 according to the eye position data 303 and the eye depth data to generate adjusted three-dimensional image data 306. The driving circuit 310 can output the adjusted three-dimensional image data 306 to the three-dimensional display panel 340 to drive the three-dimensional display panel 340. Therefore, the three-dimensional display panel 340 can display the adjusted three-dimensional image suitable for the user's current viewing screen according to the adjusted three-dimensional image data.

[0046] Reference Figure 3 and Figure 4 , more specifically, the timing relationship of relevant data and signal transmission is as Figure 4 shown. In an embodiment of the present invention, referring to the timing Sync, during the current frame F1 from time t0 to time t5, the microcontroller unit 311 may output a synchronization signal 301 (pulse signal) to the processing circuit 321 at times t0, t5, and t12. Therefore, referring to the timing Texp, during the period from time t0 to time t1, the processing circuit 321 may operate the image / depth sensor 322 according to the synchronization signal 301 to perform an exposure operation. Then, referring to the timing Tdta, during the period from time t2 to time t4, the image / depth sensor 322 may send the eye tracking data 302 including the scene image and the scene depth map to the processing circuit 321. Referring to the timing Talg, during the period from time t3 to time t5, the processing circuit 321 may execute an eye tracking algorithm to generate eye position data 303 and eye depth data 304. Therefore, referring to the timing Tpso, during the period from time t6 to time t7 in the idle period of the next frame F2 from time t5 to time t9, the processing circuit 321 outputs the eye position data 303 and the eye depth data 304 to the microcontroller unit 311 of the driving circuit 310. In an embodiment of the present invention, the processing circuit 321 may output the eye position data 303 and the eye depth data 304 to the microcontroller unit 311 of the driving circuit 310 during the idle period of another frame after the next frame.

[0047] Referring to the timing Din, during the period from time t7 to time t10, the microcontroller unit 311 of the driving circuit 310 may receive the original three-dimensional image data 305 from the scaling controller 350. Referring to the timing Dout, during the period from time t8 to time t11, the three-dimensional mapping circuit 312 of the driving circuit 310 may adjust the original three-dimensional image data 305 according to the eye position to output the adjusted three-dimensional image data 306 to the three-dimensional display panel 340. Therefore, referring to the timing Dis, during the period from time t9 to time t12, the three-dimensional display panel 340 may display the adjusted three-dimensional image suitable for the user's current viewing screen according to the adjusted three-dimensional image data 306.

[0048] Taking the 3D display panel 340 with a refresh rate of 144 Hz as an example, the time length from the time t0 when exposure starts to the time t9 when the first display line of the 3D display panel 340 starts to display the adjusted 3D image can be 9.2 milliseconds (ms). The time length from the time t0 when exposure starts to the time t12 when the first display line of the 3D display panel 340 finishes displaying the adjusted 3D image can be 15.5 ms. Therefore, the 3D display system 300 can effectively reduce the data transmission delay between the driving circuit 310 and the main control device 330.

[0049] Figure 5 is a schematic diagram of a 3D display system according to an embodiment of the present invention. Refer to Figure 5 FIG. 5, the 3D display system 500 includes a driving circuit 510, an eye tracking module 520, a processing circuit 521, a main control device 530, a 3D display panel 540, and a scaling controller 550. The driving circuit 510 is coupled to the eye tracking module 520 and the 3D display panel 540, and is coupled to the main control device 530 through the scaling controller 550. In an embodiment of the present invention, the processing circuit 521 is disposed outside the eye tracking module 520. The eye tracking module 520 can be implemented as an eye tracking camera, and the processing circuit 521 can be implemented as an integrated circuit disposed in another electronic device. In an embodiment of the present invention, the driving circuit 510 includes a microcontroller unit 511 and a 3D mapping circuit 512. The 3D mapping circuit 512 can be an application specific integrated circuit. The eye tracking module 520 includes an image / depth sensor 522. The microcontroller unit 511 is coupled to the processing circuit 521, the 3D mapping circuit 512, and the scaling controller 550.

[0050] In an embodiment of the present invention, the microcontroller unit 511 of the driving circuit 510 can output a synchronization signal 501 to the processing circuit 521, so that the processing circuit 521 controls the image / depth sensor 522 of the eye tracking module 520 to perform an eye tracking operation to generate eye data. The eye tracking data 502 includes a scene image and a scene depth map. The processing circuit 521 can analyze the eye tracking data 502 to generate eye position data 503 and eye depth data 504, and the processing circuit 521 can output the eye position data 503 and the eye depth data 504 to the driving circuit 510 through an internal integrated circuit (I2C) interface or a serial peripheral interface (SPI). In an embodiment of the present invention, the driving circuit 510 outputs the synchronization signal 501 to the processing circuit 521 and receives the eye position data 503 and the eye depth data 504 from the processing circuit 521 through the same signal transmission interface.

[0051] In an embodiment of the present invention, the main control device 530 provides the original three-dimensional image data 505 to the driving circuit 510 through the scaling controller 550. The main control device 530 may be a personal computer (PC), and may output the original three-dimensional image data 505 to the scaling controller 550 through a high-definition multimedia interface (HDMI). The scaling controller 550 may change the data or signal format of the original three-dimensional image data 505, and may output the original three-dimensional image data 505 to the microcontroller unit 511 through an embedded display port (eDP). In an embodiment of the present invention, the microcontroller unit 511 may provide the original three-dimensional image data 505, the eye position data 503, and the eye depth data 504 to the three-dimensional mapping circuit 512. The three-dimensional mapping circuit 512 may be a data calculation circuit, and is used to dynamically adjust the original three-dimensional image data 505 according to the eye position data 503 and the eye depth data to generate the adjusted three-dimensional image data 506. The driving circuit 510 may output the adjusted three-dimensional image data 506 to the three-dimensional display panel 540 to drive the three-dimensional display panel 540. Therefore, the three-dimensional display panel 540 may display a three-dimensional image suitable for the user's current viewing screen according to the adjusted three-dimensional image data.

[0052] Figure 6 is a schematic diagram of a three-dimensional display system according to an embodiment of the present invention. Refer to Figure 6 , the three-dimensional display system 600 includes a driving circuit 610, an eye tracking module 620, a main control device 630, a three-dimensional display panel 640, and a scaling controller 650. The driving circuit 610 is coupled to the eye tracking module 620 and the three-dimensional display panel 640, and is coupled to the main control device 630 through the scaling controller 650. In an embodiment of the present invention, the eye tracking module 620 may be implemented as an eye tracking camera. In an embodiment of the present invention, the driving circuit 610 includes a microcontroller unit 611 and a three-dimensional mapping circuit 612. The three-dimensional mapping circuit 612 may be an application-specific integrated circuit. The eye tracking module 620 includes an image / depth sensor 622. The microcontroller unit 611 is coupled to the image / depth sensor 622, the three-dimensional mapping circuit 612, and the scaling controller 650.

[0053] In an embodiment of the present invention, the microcontroller unit 611 of the driving circuit 610 may output a synchronization signal 601 to the image / depth sensor 622 to control the image / depth sensor 622 of the eye tracking module 620 to perform an eye tracking operation to generate eye tracking data 602. The eye tracking data 602 includes a scene image and a scene depth map. The microcontroller unit 611 may output the synchronization signal 601 to the image / depth sensor 622 through the same signal transmission interface (such as a Mobile Industry Processor Interface (MIPI)), and receive the eye tracking data 602 from the image / depth sensor 622. The microcontroller unit 611 may analyze the eye tracking data 602 to generate eye position data 603 and eye depth data 604, or the microcontroller unit 611 may output the eye tracking data 602 to the 3D mapping circuit 612 to enable the 3D mapping circuit 612 to analyze the eye tracking data 602 to generate eye position data 603 and eye depth data 604.

[0054] In an embodiment of the present invention, the main control device 630 may provide the original 3D image data 605 to the driving circuit 610 through the scaling controller 650. The main control device 630 may be a personal computer (PC), and may output the original 3D image data 605 to the scaling controller 650 through a High-Definition Multimedia Interface (HDMI). The scaling controller 650 may change the data or signal format of the original 3D image data 605, and may output the original 3D image data 605 to the microcontroller unit 611 through an Embedded DisplayPort (eDP). In an embodiment of the present invention, the microcontroller unit 611 may provide the original 3D image data 605, the eye position data 603, and the eye depth data 604 to the 3D mapping circuit 612. The 3D mapping circuit 612 may be a data calculation circuit, and is used to dynamically adjust the original 3D image data 605 according to the eye position data 603 and the eye depth data to generate adjusted 3D image data 606. The driving circuit 610 may output the adjusted 3D image data 606 to the 3D display panel 640 to drive the 3D display panel 640. Therefore, the 3D display panel 640 may display the adjusted 3D image suitable for the user's current viewing screen according to the adjusted 3D image data.

[0055] In summary, the three-dimensional display system, driving circuit, and display method of the present invention can effectively adjust the three-dimensional image dynamically according to the user's eye position, so that the three-dimensional display panel can display the three-dimensional image. Moreover, the main control device of the three-dimensional display system does not need to receive the eye position data and the eye depth data to process the original three-dimensional image data. In this way, the computing resources of the main control device and the data transmission delay between the driving circuit and the main control device can be effectively reduced.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A three-dimensional display system, characterized in that: include: An eye tracking module, used to generate eye tracking data including a scene image and a scene depth map, and perform eye detection to output eye position data and eye depth data; A driving circuit, coupled to the eye tracking module, and configured to receive the eye position data and the eye depth data; as well as A main control device, coupled to the driving circuit, and used to provide original three-dimensional image data, The driving circuit is further used to dynamically adjust the original three-dimensional image data according to the eyeball position data and the eyeball depth data to generate adjusted three-dimensional image data.

2. The three-dimensional display system according to claim 1, characterized in that: The driving circuit is further configured to output a synchronization signal to the processing circuit or the eye tracking module, so that the processing circuit controls the image / depth sensor or the eye tracking module to perform an eye tracking operation to generate the eye tracking data.

3. The three-dimensional display system according to claim 2, characterized in that: The driving circuit outputs the synchronization signal during an idle period of a current frame of the original three-dimensional image data.

4. The three-dimensional display system according to claim 3, characterized in that: The processing circuit controls the image / depth sensor to perform an exposure operation during the idle period of the current frame of the raw 3D image data to generate the eye tracking data.

5. The three-dimensional display system according to claim 3, characterized in that: The processing circuit outputs the eye position data and the eye depth data to the driving circuit during an idle period of a next frame.

6. The three-dimensional display system according to claim 3, characterized in that: The processing circuit outputs the eye position data and the eye depth data to the driving circuit during an idle period of another frame after the next frame.

7. The three-dimensional display system according to claim 2, characterized in that: The driving circuit outputs the synchronization signal to the processing circuit, and receives the eye position data and the eye depth data from the processing circuit.

8. The three-dimensional display system according to claim 1, characterized in that: Also includes: A three-dimensional display panel is coupled to the driving circuit. The driving circuit is further used to drive the three-dimensional display panel according to the adjusted three-dimensional image data to display the adjusted three-dimensional image.

9. The three-dimensional display system according to claim 1, characterized in that: Also includes: The scaling controller is coupled between the driving circuit and the main control device, wherein the main control device is used to provide the original three-dimensional image data to the driving circuit through the scaling controller.

10. A driving circuit for driving a three-dimensional display panel, characterized in that: include: A microcontroller unit for receiving raw three-dimensional image data, eye position data, and eye depth data; as well as a three-dimensional mapping circuit, coupled to the microcontroller unit, and used to dynamically adjust the original three-dimensional image data according to the eye position data and the eye depth data to generate adjusted three-dimensional image data, The three-dimensional display panel is further used for displaying an adjusted three-dimensional image according to the adjusted three-dimensional image data.

11. The driving circuit according to claim 10, characterized in that: The microcontroller unit is further used to output a synchronization signal to a processing circuit or an eye tracking module, so that the processing circuit controls the image / depth sensor or the eye tracking module to perform an eye tracking operation.

12. The driving circuit according to claim 11, characterized in that: The microcontroller unit outputs the synchronization signal during an idle period of a current frame of the raw three-dimensional image data.

13. The driving circuit according to claim 11, characterized in that: The microcontroller unit outputs the synchronization signal to the processing circuit, and receives the eye position data and the eye depth data from the processing circuit.

14. A display method, characterized in that: include: Generate eye tracking data including a scene image and a scene depth map through an eye tracking module; Performing eye detection through the eye tracking module to output eye position data and eye depth data; receiving the eyeball position data and the eyeball depth data through a driving circuit; Providing original three-dimensional image data through a main control device; as well as The original three-dimensional image data is dynamically adjusted by the driving circuit according to the eyeball position data and the eyeball depth data to generate adjusted three-dimensional image data.

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