JP2019032394A - Endoscope device, image display program, and image display method - Google Patents

Abstract

To provide an endoscope device, an image display program, and an image display method for displaying a thumb nail to more correctly discriminate an endoscope image.SOLUTION: An endoscope device comprises: a representative image acquisition part P1 for outputting a moving image of an endoscope image E acquired by imaging a subject to a display part 21, and for acquiring a candidate image on the basis of a frame closest to the endoscope image E in accordance with a predetermined operation, and for acquiring a representative image representing the endoscope image E on the basis of the candidate image; and a thumb nail output part P2 for generating a thumb nail on the basis of the representative image, and for outputting the thumb nail to the display part 21.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an endoscope apparatus, an image display program, and an image display method.

  2. Description of the Related Art Conventionally, there are endoscope apparatuses capable of recording and reproducing moving image and still image endoscopic images acquired by imaging an object.

  In general, in an imaging apparatus capable of recording and reproducing an image, a thumbnail may be generated and displayed so that the recorded image can be roughly grasped.

  For example, Japanese Patent Application Laid-Open No. 2011-130198 discloses an imaging apparatus that generates and displays thumbnails based on an image near the final frame of moving image data.

  As another conventional example, Japanese Patent Laying-Open No. 2015-41196 specifies a part of a scene of a moving image that is being recorded by a user operation while recording a moving image. An image playback device that generates and displays thumbnails based on the images is disclosed.

JP2011-130198A Japanese Unexamined Patent Publication No. 2015-41961

  However, in a conventional endoscope apparatus, when a thumbnail is generated by an imaging apparatus, a thumbnail based on an image in the vicinity of the last frame in a state where the endoscopic examination is almost completed may be displayed.

  Further, in a conventional endoscope apparatus, when a thumbnail is generated by an image reproduction apparatus, a thumbnail based on an image with a low degree of attention may be displayed depending on a user operation.

  Therefore, in the conventional endoscope apparatus, the user may not be able to correctly determine the endoscope image by the thumbnail.

  Therefore, an object of the present invention is to provide an endoscope apparatus, an image display program, and an image display method that display thumbnails that can more accurately determine an endoscopic image.

  An endoscope apparatus according to an aspect of the present invention outputs a moving image of an endoscopic image acquired by imaging a subject to a display unit, and based on a most recent frame of the endoscopic image according to a predetermined operation. A candidate image is acquired, a representative image representing the endoscopic image is obtained based on the candidate image, and a thumbnail is generated based on the representative image, and the thumbnail is displayed. A thumbnail output unit for outputting to the unit.

  An image display program according to an aspect of the present invention outputs a moving image of an endoscopic image acquired by imaging a subject to a display unit, and based on a most recent frame of the endoscopic image according to a predetermined operation. A candidate image is acquired, a representative image representing the endoscopic image is acquired based on the candidate image, a code of a representative image acquisition unit, a thumbnail is generated based on the representative image, and the thumbnail is The computer executes the code of the thumbnail output unit to be output to the display unit.

  According to an image display method of one embodiment of the present invention, a video of an endoscopic image acquired by imaging a subject is output to a display unit by processing of a representative image acquisition unit, and the endoscope is operated according to a predetermined operation. A candidate image is obtained based on the most recent frame of the image, a representative image representing the endoscopic image is obtained based on the candidate image, and a thumbnail is obtained based on the representative image by processing of a thumbnail output unit. Generate the thumbnail and output the thumbnail to the display unit.

  According to the present invention, it is possible to provide an endoscope apparatus, an image display program, and an image display method that display thumbnails that can more accurately determine an endoscopic image.

It is a figure showing an example of the appearance of an endoscope apparatus concerning an embodiment of the present invention. It is a block diagram which shows an example of the internal structure of the endoscope apparatus concerning embodiment of this invention. It is a flowchart which shows an example of the flow of the representative image acquisition process of the endoscope apparatus concerning embodiment of this invention. It is a flowchart which shows an example of the flow of the thumbnail output process of the endoscope apparatus concerning embodiment of this invention. It is explanatory drawing for demonstrating an example of the structure of the thumbnail list of the endoscope apparatus concerning embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Constitution)
FIG. 1 is a diagram illustrating an example of an appearance of an endoscope apparatus 1 according to an embodiment of the present invention.

  As shown in FIG. 1, the endoscope apparatus 1 includes an endoscope 2 and an apparatus body 3. The endoscope 2 and the apparatus main body 3 are connected by a cable 4.

  The endoscope 2 has an insertion portion 2a formed in an elongated shape, and can be inserted into a subject from a distal end portion 2b of the insertion portion 2a. A bending portion 2c is provided on the proximal end side of the distal end portion 2b. An optical adapter 2d is attached to the distal end portion 2b.

  The optical adapter 2d has an illumination window, an observation window, and an optical system. The optical adapter 2d includes, for example, a direct-view adapter, a side-view adapter, and a stereo adapter, and can be exchanged according to the subject.

  The optical adapter 2d includes a storage unit 2e that stores identification information set in advance to identify the optical adapter 2d (FIG. 2).

  An operation unit 5 is provided on the proximal end side of the endoscope 2 and includes operation tools such as a joystick and buttons. The operation unit 5 is connected to the control unit 41 and outputs a control signal to the control unit 41 in response to an instruction input. The operation unit 5 can input instructions for freeze processing, measurement processing, and still image recording processing in addition to various types of instruction input.

  FIG. 2 is a block diagram illustrating an example of an internal configuration of the endoscope apparatus 1 according to the embodiment of the present invention.

  Next, the internal configuration of the endoscope apparatus 1 will be described.

  The endoscope 2 includes an insertion section 2a, a distal end section 2b, a bending section 2c, an optical adapter 2d, a storage section 2e, and an operation section 5, a bending drive section 11, a reading section 12, an illumination section 13, an imaging section 14, and an image. A processing unit 15 is included.

  The bending drive unit 11 is coupled to the bending portion 2c by a pulling member, and bends the bending portion 2c by the advancement and retraction of the pulling member under the control of the control unit 41.

  The reading part 12 is provided in the front-end | tip part 2b, and reads identification information from the storage part 2e electromagnetically. When the optical adapter 2d is attached to the distal end portion 2b, the reading unit 12 reads the identification information from the storage unit 2e and outputs the identification information to the control unit 41.

  The illumination unit 13 is provided at the distal end portion 2b, has a light emitting element such as an LED, and outputs illumination light under the control of the control unit 41. The output illumination light is irradiated to the subject through the illumination window of the optical adapter 2d.

  The imaging unit 14 is provided at the distal end 2 b and has an imaging element such as a CMOS or a CCD, photoelectrically converts the return light of the subject, and outputs an imaging signal to the image processing unit 15. That is, the imaging unit 14 images a subject.

  The image processing unit 15 generates an endoscopic image E based on the imaging signal input from the imaging unit 14 and outputs the endoscopic image E to the control unit 41.

  The apparatus main body 3 includes a display unit 21, a touch panel 22, an external I / F 31, a control unit 41, and a battery 51. Each of display unit 21, touch panel 22, external I / F 31, and control unit 41 is connected to bus B.

  The display unit 21 includes, for example, a display panel such as an LCD or an OLED, and displays an image such as an endoscopic image E and a thumbnail list L input from the control unit 41 on the display panel.

  The touch panel 22 is provided on the display panel and is connected to the control unit 41. When the user inputs an instruction, the touch panel 22 outputs a control signal corresponding to the user's instruction input to the control unit 41.

  That is, the operation unit 5 and the touch panel 22 constitute an instruction input unit X. That is, the instruction input unit X includes at least one of the touch panel 22 and the operation unit 5.

  The external I / F 31 performs external connection such as a LAN, a memory card C, and a USB. The endoscope apparatus 1 can access an external device connected via a LAN or USB or a memory card C via the external I / F 31.

  The control unit 41 controls the operation of each unit in the endoscope apparatus 1. When the endoscopic image E is input from the image processing unit 15, the control unit 41 outputs the endoscopic image E to the display unit 21 and displays the endoscopic image E as a live image. When there is a user instruction, the control unit 41 records the endoscopic image E in the storage unit 43. Furthermore, when there is a user instruction, the control unit 41 reads the endoscopic image E recorded in the storage unit 43, outputs the endoscopic image E to the display unit 21, and outputs the endoscopic image E as a reproduced image. Is displayed. The control unit 41 includes a CPU 42 and a storage unit 43.

  The CPU 42 executes various programs read from the storage unit 43. The function of the control part 41 is implement | achieved when CPU42 runs a program.

  The storage unit 43 includes rewritable storage elements such as a RAM, a ROM, and a flash memory.

  The storage unit 43 includes a representative image acquisition unit P1, a thumbnail output unit P2, a freeze unit P3, a measurement unit P4, a still image recording unit P5, and an identification in addition to a program and data for controlling the operation of each unit in the endoscope apparatus 1. The program of information display part P6 is also memorized.

  The representative image acquisition unit P1 outputs a moving image of the endoscopic image E acquired by imaging the subject to the display unit 21, and selects a candidate image based on the most recent frame of the endoscopic image E according to a predetermined operation. And a representative image representing the endoscopic image E is acquired based on the candidate image.

  The thumbnail output unit P2 generates a thumbnail T based on the representative image, and outputs the thumbnail T to the display unit 21.

  The freeze unit P3 performs a freeze process for temporarily stopping the endoscopic image E displayed on the display unit 21.

  The measurement unit P4 performs a measurement process for measuring the size of the subject based on the temporarily stopped endoscope image E.

  The still image recording unit P5 performs a still image recording process for recording a still image of the endoscope image E that has been paused.

  For example, the user observes the endoscope image E displayed as a moving image, and when a part with a high degree of attention is found, inputs an instruction for freeze processing to the operation unit 5 and temporarily stops the endoscope image E. When the user observes the temporarily stopped endoscope image E and determines that it is necessary to measure the size of the subject such as damage to the subject, the user inputs a measurement processing instruction to the operation unit 5 and starts the subject size measurement processing. To do. In addition, when the endoscopic image E that has been paused is observed and it is determined that still image recording is required, the user inputs an instruction for still image recording processing to the operation unit 5 to record a still image. In the still image recording process, the endoscopic image E displayed on the display unit 21 is stored in a predetermined area of the storage unit 43 as a still image.

  When the optical adapter 2d is attached to the insertion unit 2a, the identification information display unit P6 acquires the identification information stored in the storage unit 2e, and superimposes information corresponding to the identification information on the endoscope image E. Perform information display processing. Specifically, the storage unit 43 also stores identification information of the optical adapter 2d and attribute information such as the name of the optical adapter 2d associated with the identification information. When the identification information is input from the reading unit 12, the control unit 41 reads information such as the name of the optical adapter 2 d associated with the identification information from the storage unit 43 and outputs the information to the display unit 21.

  In addition, the control unit 41 records the history of the freeze process, the measurement process, the still image recording process, and the identification information display process in the storage unit 43 in association with the endoscopic image E. Specifically, when freeze processing is performed, the control unit 41 records the freeze date and time in the storage unit 43. When the measurement process is performed, the control unit 41 records the measurement date and time in the storage unit 43. When the still image recording process is performed, the control unit 41 records the still image recording date and time in the storage unit 43. When the identification information display process is performed, the control unit 41 records the identification information display date and time in the storage unit 43.

  That is, the predetermined operation includes at least one of freeze processing for temporarily stopping a moving image, subject size measurement processing, and still image recording processing for the endoscope image E. The predetermined operation may include at least one of freeze processing, measurement processing, still image recording processing, and identification information display processing.

  The battery 51 supplies power to each part in the endoscope apparatus 1 so that it can be used without being brought into the work place and connected to an external power source.

  In other words, the image display program outputs a moving image of the endoscopic image E acquired by imaging the subject to the display unit 21, and the candidate image based on the most recent frame of the endoscopic image E according to a predetermined operation. , And a thumbnail image is generated based on the code of the representative image acquisition unit P1 that acquires the representative image representing the endoscopic image E based on the candidate image and the representative image, and the thumbnail T is displayed on the display unit 21. And the code of the thumbnail output unit P2 to be output to the computer.

  In addition, the image display method outputs the moving image of the endoscopic image E acquired by imaging the subject to the display unit 21 by the processing of the representative image acquisition unit P1, and the endoscopic image E according to a predetermined operation. A candidate image is acquired based on the most recent frame, a representative image representing the endoscopic image E is acquired based on the candidate image, and a thumbnail T is generated based on the representative image by processing of the thumbnail output unit P2. Then, the thumbnail T is output to the display unit 21.

(Operation)
The operation of the representative image acquisition unit P1 will be described.

  FIG. 3 is a flowchart showing an example of the flow of representative image acquisition processing of the endoscope apparatus 1 according to the embodiment of the present invention.

  Recording of the endoscopic image E is started (S1).

  The user inputs an instruction for imaging the subject to the operation unit 5. When there is an instruction input, the operation unit 5 outputs a control signal to the control unit 41. The control unit 41 outputs a control signal to cause the illumination unit 13 to output illumination light. The illumination light is irradiated to the subject via the optical adapter 2d.

  The return light of the subject is input to the imaging unit 14 via the optical adapter 2d. The imaging unit 14 outputs an imaging signal based on the return light of the subject to the image processing unit 15. The image processing unit 15 generates an endoscopic image E based on the imaging signal and outputs it to the control unit 41. The control unit 41 outputs and displays the endoscopic image E on the display unit 21.

  The control unit 41 executes the program of the representative image acquisition unit P1, and starts the representative image acquisition process. The control unit 41 starts recording the endoscopic image E, and sequentially records the endoscopic image E input from the image processing unit 15 in the storage unit 43.

  It is determined whether or not a predetermined operation is being performed (S2). The predetermined operation is any one of freeze processing, measurement processing, still image recording processing, and identification information display processing. When the predetermined operation is being performed, the process proceeds to S3. On the other hand, when the predetermined operation is not performed, the process proceeds to S4.

  The candidate image is recorded in the storage unit 43 (S3). The control unit 41 acquires a candidate image based on the latest frame input from the image processing unit 15 and records it in the storage unit 43. Specifically, the control unit 41 writes flag information indicating a candidate image, a recording reason, and a recording date and time in the metadata of the frame of the candidate image recorded in the storage unit 43. The recording reason is, for example, any of freeze processing, measurement processing, still image recording processing, or identification information display processing. The recording date / time is one of a freeze date / time, a measurement date / time, a still image recording date / time, or an identification information display date / time.

  It is determined whether there is a recording end instruction (S4). The control unit 41 determines whether or not a recording end instruction is input by the instruction input unit X. If there is an input of a recording end instruction, the process proceeds to S5. When no recording end instruction is input, the process returns to S2.

  The recording of the endoscope image E is finished (S5). The control unit 41 ends the recording of the endoscopic image E.

  The number of candidate images is detected, and the process branches to a process corresponding to the number (S6). The control unit 41 detects the number of candidate images recorded in the storage unit 43 in S3. When a plurality of candidate images are detected, the process proceeds to S7. When one candidate image is detected, the process proceeds to S8. When no candidate image is detected, the process proceeds to S9.

  A representative image is acquired based on a predetermined priority (S7). The predetermined priorities are ranked according to recording reasons, and are set higher in the order of measurement processing, still image recording processing, freeze processing, and identification information display processing. The control unit 41 acquires the recording reason associated with the candidate image, and acquires the candidate image having the highest priority recording reason as the representative image. When there are a plurality of candidate images having a recording reason with the highest priority, one of the plurality of candidate images is acquired as a representative image.

  For example, when there is a candidate image associated with each of the measurement process and the still image recording process, the control unit 41 acquires a representative image based on the candidate image associated with the measurement process.

  That is, the representative image acquisition unit P1 acquires a representative image from candidate images based on a predetermined priority order. After S7, the process proceeds to S10.

  In S8, the candidate image is acquired as a representative image. After S8, the process proceeds to S10.

  In S9, a representative image is acquired based on the first frame of the endoscopic image E.

  Information on the representative image is recorded (S10). The control unit 41 records the representative image acquired in S7 to S9 in a predetermined area of the storage unit 43. Specifically, the control unit 41 writes flag information indicating the representative image in the metadata of the frame of the representative image of the endoscopic image E.

  That is, the representative image acquisition unit P1 records candidate images and representative images in the storage unit 43. Further, the representative image acquisition unit P1 performs recording by writing predetermined information in the metadata of the endoscopic image E recorded in the storage unit 43.

  Next, the operation of the thumbnail output unit P2 will be described.

  FIG. 4 is a flowchart illustrating an example of a thumbnail output process flow of the endoscope apparatus 1 according to the embodiment of the present invention. FIG. 5 is an explanatory diagram for explaining an example of the configuration of the thumbnail list L of the endoscope apparatus 1 according to the embodiment of the present invention.

  When the user inputs an instruction to start the thumbnail output process via the instruction input unit X, the control unit 41 executes the program of the thumbnail output unit P2 and starts the thumbnail output process.

  A thumbnail T is generated based on the representative image (S11). The control unit 41 extracts, from the endoscopic image E recorded in the storage unit 43, a metadata frame having flag information indicating a representative image. The control unit 41 performs a predetermined image generation process on the extracted frame image to generate a thumbnail T. The predetermined image generation process is performed, for example, by generating an image of a predetermined size based on a target image such as a representative image.

  Further, when a still image is recorded by a still image recording process or the like in a predetermined area of the storage unit 43, the control unit 41 reads the still image, performs a predetermined image generation process on the still image, and generates a thumbnail T. .

  A thumbnail T is displayed (S12). The control unit 41 rearranges the thumbnails T generated in S11 in a predetermined order, arranges them so that they can be listed, and generates a thumbnail list L. In the example of the thumbnail list L in FIG. 5, the thumbnails T are arranged in three columns. The control unit 41 may superimpose character information T1 such as a file name on the thumbnail T. In FIG. 5, the character information T1 is schematically represented as “XXX XXX”. The thumbnail T may be superimposed with a mark T2 indicating that it is a moving image. That is, the thumbnail output unit P2 arranges the thumbnails T in a list format and outputs them to the display unit 21.

  It is determined whether or not a plurality of candidate images are included in the endoscopic image E displaying the thumbnail T (S13). The control unit 41 determines whether or not a plurality of candidate images are included in the endoscopic image E displaying the thumbnail T. When there are a plurality of candidate images, the process proceeds to S14. When a plurality of candidate images are not included, the thumbnail output process ends.

  The thumbnail T is switched and displayed (S14). When there are a plurality of candidate images in the endoscopic image E extracted in S11, the control unit 41 also generates thumbnails T for the plurality of candidate images. The control unit 41 switches and displays the thumbnails T generated by the representative image and the candidate image at predetermined time intervals in order from the oldest shooting date and time. That is, the thumbnail output unit P2 generates the thumbnail T based on the representative image and the candidate image, sequentially switches the thumbnail T, and outputs the thumbnail T to the display unit 21.

  Thereby, in the endoscope apparatus 1, a thumbnail T is generated based on an image with a high degree of user attention in the freeze process, the measurement process, the still image recording process, and the identification information display process. Therefore, in the endoscope apparatus 1, the endoscopic image E can be more correctly determined by the thumbnail T.

  According to the embodiment, the endoscope apparatus 1 can generate the thumbnail T that can more accurately determine the endoscopic image E.

  In the embodiment, the predetermined priority is ranked by the recording reason, but may be further ranked by the recording date and time. In that case, each of the measurement process, the still image recording process, the freeze process, and the identification information display process is set so that the order of the new recording date is higher than the old recording date.

  In the embodiment, the representative image acquisition unit P1 acquires the representative image according to a predetermined priority order. However, the representative image acquisition unit P1 may acquire the representative image based on the candidate image selected by the user.

  In the embodiment, the representative image acquisition unit P1 acquires one representative image from a plurality of candidate images according to a predetermined priority order. However, one representative image obtained by arranging a plurality of candidate images on one image is used. You may acquire an image.

  In the embodiment, the instruction input unit X can input freeze processing, measurement processing, and still image recording processing. For example, the freeze input processing and measurement processing, freeze processing and still image recording processing, and / or The freeze process, the measurement process, and the still image recording process may be configured to be input by a single instruction.

  Each “unit” in this specification is a conceptual one corresponding to each function of the embodiment, and does not necessarily correspond to a specific hardware or software routine on a one-to-one basis. Therefore, in the present specification, the embodiment has been described assuming a virtual circuit block (unit) having each function of the embodiment. In addition, each step of each procedure in the present embodiment may be executed in a different order for each execution by changing the execution order and executing a plurality of steps at the same time, as long as it does not contradict its nature. Furthermore, all or a part of each step of each procedure in the present embodiment may be realized by hardware.

  The present invention is not limited to the above-described embodiments, and various changes and modifications can be made without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Endoscope apparatus 2 Endoscope 2a Insertion part 2b Tip part 2c Curved part 2d Optical adapter 2e Storage part 3 Apparatus main body 4 Cable 5 Operation part 11 Curvature drive part 12 Reading part 13 Illumination part 14 Imaging part 15 Image processing part 21 Display unit 22 Touch panel 31 External I / F
41 control unit 42 CPU
43 storage unit 51 battery B bus C memory card E endoscopic image L thumbnail list P1 representative image acquisition unit P2 thumbnail output unit P3 freeze unit P4 measurement unit P5 still image recording unit P6 identification information display unit T thumbnail T1 character information T2 mark X instruction input part

Claims (17)

A video of an endoscopic image acquired by imaging a subject is output to a display unit, a candidate image is acquired based on the most recent frame of the endoscopic image according to a predetermined operation, and based on the candidate image A representative image acquisition unit for acquiring a representative image representative of the endoscopic image;
A thumbnail output unit that generates a thumbnail based on the representative image and outputs the thumbnail to the display unit;
An endoscope apparatus having   The endoscope apparatus according to claim 1, further comprising an imaging unit that images the subject. Having a storage unit,
The representative image acquisition unit records the candidate image and the representative image in the storage unit.
The endoscope apparatus according to claim 1.   The endoscope apparatus according to claim 3, wherein the representative image acquisition unit performs the recording by writing predetermined information in metadata of the endoscope image recorded in the storage unit. The predetermined operation includes at least one of a freeze process for temporarily stopping the moving image, a process for measuring the size of the subject, and a still image recording process for the endoscopic image.
The endoscope apparatus according to claim 1. An instruction input unit,
The instruction input unit includes at least one of a touch panel and an operation unit, and can input instructions for the freeze processing, the measurement processing, and the still image recording processing.
The endoscope apparatus according to claim 5. It has an optical adapter and an identification information display part,
The optical adapter has a storage unit that stores identification information;
The identification information display unit acquires the identification information stored in the storage unit when the optical adapter is attached to the insertion unit, and superimposes information corresponding to the identification information on the endoscopic image. Perform identification information display processing,
The endoscope apparatus according to claim 5.   The endoscope apparatus according to claim 7, wherein the predetermined operation includes at least one of the freeze process, the measurement process, the still image recording process, and the identification information display process.   The endoscope apparatus according to claim 8, wherein the representative image acquisition unit acquires the representative image from the candidate images based on a predetermined priority order.   The endoscope according to claim 9, wherein the predetermined priority order is ranked according to a recording reason, and is set higher in the order of the measurement process, the still image recording process, the freeze process, and the identification information display process. apparatus.   The endoscope apparatus according to claim 10, wherein each of the measurement process, the still image recording process, the freeze process, and the identification information display process is set so that the order of the new recording date is higher than the old recording date.   The endoscope apparatus according to claim 1, wherein the representative image acquisition unit acquires the representative image based on the candidate image selected by a user.   The endoscope apparatus according to claim 1, wherein the representative image acquisition unit acquires one representative image obtained by arranging a plurality of candidate images on one image.   The endoscope apparatus according to claim 1, wherein the thumbnail output unit arranges the thumbnails in a list format and outputs the thumbnails to the display unit.   The endoscope apparatus according to claim 1, wherein the thumbnail output unit generates the thumbnail based on the representative image and the candidate image, sequentially switches the thumbnail, and outputs the thumbnail to the display unit. A video of an endoscopic image acquired by imaging a subject is output to a display unit, a candidate image is acquired based on the most recent frame of the endoscopic image according to a predetermined operation, and based on the candidate image A representative image acquisition unit for acquiring a representative image representative of the endoscopic image;
Based on the representative image, a thumbnail is generated, and the thumbnail is output to the display unit.
An image display program that causes a computer to execute. By the processing of the representative image acquisition unit, a moving image of the endoscopic image acquired by imaging the subject is output to the display unit, and a candidate image is obtained based on the most recent frame of the endoscopic image according to a predetermined operation. Obtaining a representative image representing the endoscopic image based on the candidate image,
The thumbnail output unit generates a thumbnail based on the representative image, and outputs the thumbnail to the display unit.
Image display method.

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