Apparatus, method, and program

Abstract

To accurately distinguish an on-land subject and an on-sea subject and detect them.SOLUTION: A device 4 includes: an image acquisition unit 41 that acquires an image from an imaging device installed on the own ship; a detection unit 43 that distinguishes an on-land subject located on the land from an on-sea subject located on the sea in the subjects of the image and detects them; and a display control unit 44 that displays the image by reducing the visibility of the on-land subject in the image compared to the visibility of the on-sea subject on the basis of the detection result by the detection unit 43. The detection unit 43 performs image recognition on the image to detect each subject.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to an apparatus, a method, and a program.

Background Art

[0002] Patent Documents 1 to 7 describe, for example, "at least one of the video obtained by a radar and the image obtained by an automatic ship identification device is subjected to coordinate transformation into the same coordinate system as the landscape image obtained by a marine landscape projection device on the landscape image obtained by the marine landscape projection device, and then superimposed to integrate and display each image" (paragraph 0006 of Patent Document 1). [Prior Art Documents] [Patent Documents] [Patent Document 1] Japanese Patent Application Laid-Open No. 2005-61893 [Patent Document 2] International Publication No. 2021-132437 [Patent Document 3] Japanese Patent Application Laid-Open No. 2005-28926 [Patent Document 4] Japanese Patent Application Laid-Open No. 2021-103396 [Patent Document 5] Japanese Patent Application Laid-Open No. 2018-8574 [Patent Document 6] International Publication No. 2020 / 116194 [Patent Document 7] International Publication No. 2020 / 116195

Summary of the Invention

[0003] In a first aspect of the present invention, there is provided an apparatus including an image acquisition unit that acquires an image from an imaging device provided on a host ship, a detection unit that distinguishes and detects a land subject located on land and a marine subject located on the sea among subjects of the image, and a display control unit that displays the image while reducing the visibility of the land subject in the image below the visibility of the marine subject based on the detection result by the detection unit.

[0004] In the above apparatus, the detection unit may perform image recognition on the image to detect each subject.

[0005] The above-described apparatus includes a measurement result acquisition unit that acquires measurement results in the image acquisition direction from a radar device installed on the vessel, and the detection unit may distinguish between the land subject and the sea subject based on the measurement results.

[0006] In the above-described apparatus, the detection unit may classify stationary objects and moving objects on stationary objects as land objects among the objects indicated by the measurement results of the radar device, and detect subjects in the image that correspond to land objects as land subjects.

[0007] In the above-described apparatus, which includes a measurement result acquisition unit, the detection unit may identify moving objects that are not located on stationary objects among the moving objects indicated by the measurement results of the radar device as sea objects, and detect subjects in the image that correspond to sea objects as sea subjects.

[0008] In the above-described apparatus, which includes a measurement result acquisition unit, the measurement result acquisition unit acquires a display image showing the display screen of the radar device as the measurement result, and the detection unit may further perform image recognition on the display image to distinguish between the land subject and the sea subject.

[0009] In any of the above-described devices, the display control unit may reduce at least one of the brightness, contrast, or sharpness of the ground subject in the image.

[0010] In any of the above-described devices, the display control unit may increase at least one of the brightness, contrast, or sharpness of the marine subject in the image.

[0011] A second embodiment of the present invention provides a method comprising: an image acquisition step of acquiring an image from an imaging device installed on the vessel; a detection step of distinguishing and detecting land-based subjects located on land and sea-based subjects located at sea among the subjects of the image; and a display control step of displaying the image by reducing the visibility of land-based subjects in the image to that of sea-based subjects based on the detection results from the detection step.

[0012] In a third aspect of the present invention, a program is provided that causes a computer to function as an image acquisition unit that acquires an image from an imaging device installed on the ship, a detection unit that distinguishes and detects land-based subjects located on land and sea-based subjects located at sea among the subjects of the image, and a display control unit that, based on the detection results by the detection unit, displays the image by reducing the visibility of land-based subjects in the image to that of sea-based subjects.

[0013] It should be noted that the above summary of the invention does not list all the necessary features of the present invention. Furthermore, subcombinations of these features may also constitute an invention. [Brief explanation of the drawing]

[0014] [Figure 1] System 1 according to an embodiment is shown. [Figure 2] This shows the operation of the control support system 4. [Figure 3] An example of the display screen is shown. [Figure 4] Examples of a computer 2200 in which multiple aspects of the present invention may be embodied in whole or in part are shown. [Modes for carrying out the invention]

[0015] The present invention will be described below through embodiments, but these embodiments are not intended to limit the scope of the claims. Furthermore, not all combinations of features described in the embodiments are necessarily essential to the solution of the invention.

[0016] <1. System 1> FIG. 1 shows a system 1 according to the present embodiment. The system 1 is mounted on a ship and assists in the operation of the ship, and includes an imaging device 2, a radar device 3, and a maneuvering support device 4 provided on the own ship, respectively.

[0017] <1.2. Imaging device 2> The imaging device 2 may image at least a part of the water area around the own ship. The imaging device 2 may be arranged facing the front of the own ship, and as an example, may be arranged at the front end. The imaging device 2 may always image a moving image, or may image a still image every reference interval. The imaging device 2 may perform imaging with visible light, or may perform imaging with infrared rays or ultraviolet rays (for example, X-rays). The imaging device 2 may supply the captured image to the maneuvering support device 4.

[0018] When the imaging device 2 images a moving image, the supplied image may be a frame in the moving image, and when the imaging device 2 images a still image, the supplied image may be a still image. Also, in the present embodiment, as an example, it is described that one imaging device 2 is mounted on the own ship, but a plurality of imaging devices 2 may be mounted.

[0019] <1.3. Radar device 3> The radar device 3 may measure the direction of an object existing around the own ship (for example, the azimuth with respect to the traveling direction of the own ship) and the distance from the own ship. The radar device may be a radar (Radio Detecting and Ranging) using radio waves, or may be a radar using laser light (so-called LiDAR (Light Detection And Ranging)). The radar device 3 may supply the measurement result to the maneuvering support device 4.

[0020] <1.4. Maneuvering support device 4> The maneuvering support device 4 is an example of a device, and includes an image acquisition unit 41, a measurement result acquisition unit 42, a detection unit 43, a display control unit 44, and a display unit 45.

[0021] <1.4.1. Image acquisition unit 41> The image acquisition unit 41 acquires an image from the imaging device 2. The image acquisition unit 41 may supply the acquired image to the detection unit 43 and the display control unit 44.

[0022] <1.4.2. Measurement result acquisition unit 42> The measurement result acquisition unit 42 acquires measurement results in the imaging direction of the image from the radar device 3. The measurement result acquisition unit 42 may store in advance the imaging direction by the imaging device 2 (for example, the azimuth with respect to the traveling direction of the own ship). The measurement result acquisition unit 42 may acquire numerical data indicating the position information of each object in the imaging direction (for example, information indicating the azimuth of the object with respect to the traveling direction of the own ship and the distance from the own ship to the object) as the measurement result. The measurement result of the radar device 3 may indicate whether each object is stationary or moving. The movement performed by the object may be any movement such as a translational movement or a rotational movement. The measurement result acquisition unit 42 may supply the acquired measurement result to the detection unit 43.

[0023] <1.4.3. Detection unit 43> The detection unit 43 distinguishes and detects a land subject located on land and a sea subject located on the sea among the subjects of the image. The land subject may be a building, a vehicle, a crane, a person, etc., and may include land. The sea subject may be a ship, a buoy, a swimmer, etc., and may include the sea.

[0024] The detection unit 43 may perform image recognition on the image to detect each subject. The detection unit 43 may distinguish between a land subject and a sea subject based on the measurement result by the radar device 3. The detection unit 43 may collate the position of each subject in the image with the position of each object indicated by the measurement result by the radar device 3, and associate each subject in the image with any object indicated by the measurement result.

[0025] The detection unit 43 may define stationary objects and moving objects on stationary objects as land objects among the objects indicated by the measurement results of the radar device 3, and may detect subjects in the image that correspond to land objects as land subjects. A stationary object may be, for example, land, or a port or building located on land. A moving object on a stationary object may be a car, crane, person, etc.

[0026] In addition to or instead of the above, the detection unit 43 may identify any moving object not located on a stationary object as a sea object, and may detect subjects in the image that correspond to sea objects as sea subjects. Examples of moving objects not located on a stationary object may include the sea, ships, buoys, swimmers, etc.

[0027] The detection unit 43 may supply the display control unit 44 with positional information of at least one of the land-based subject and the sea-based subject in the image.

[0028] <1.4.4. Display Control Unit 44> The display control unit 44 displays the image by lowering the visibility of land subjects in the image compared to the visibility of sea subjects, based on the detection results from the detection unit 43. The display control unit 44 may lower at least one of the brightness, contrast, or sharpness of land subjects in the image. The display control unit 44 may increase at least one of the brightness, contrast, or sharpness of sea subjects in the image. In this embodiment, as an example, the display control unit 44 may display the image on the display unit 45.

[0029] <1.4.5.Display section 45> The display unit 45 displays various information. The display unit 45 may display an image from the image acquisition unit 41 in accordance with the control of the display control unit 44.

[0030] According to the steering support device 4 described above, among the subjects of images acquired from the imaging device 2 installed on the ship, land-based subjects located on land and sea-based subjects located at sea are detected separately, and the visibility of land-based subjects is reduced compared to the visibility of sea-based subjects in the image. Therefore, since sea-based subjects can be displayed in a way that makes them easier to see than land-based subjects, the ship can be steered while concentrating on objects at sea.

[0031] Furthermore, since image recognition is performed to detect each subject within the image, it is possible to distinguish between land-based subjects and sea-based subjects among the detected subjects.

[0032] Furthermore, measurement results in the image acquisition direction are obtained from the radar device 3, and land and sea subjects are detected based on these measurement results, so that land and sea subjects can be accurately distinguished and detected.

[0033] Furthermore, among the objects indicated by the measurement results of the radar device 3, stationary objects and moving objects on stationary objects are classified as land objects, and subjects in the image corresponding to these land objects are detected as land subjects. Therefore, land subjects can be accurately distinguished and detected from sea subjects.

[0034] Furthermore, among the moving objects indicated by the measurement results of the radar device 3, moving objects not located above stationary objects are classified as objects on the sea, and among the subjects in the image, subjects corresponding to objects on the sea are detected as objects on the sea. Therefore, objects on the sea can be accurately distinguished and detected from objects on land.

[0035] Furthermore, since at least one of the brightness, contrast, or sharpness of the land subject in the image is reduced, the visibility of the land subject can be reliably reduced.

[0036] Furthermore, since at least one of the brightness, contrast, or sharpness of the marine subject in the image is increased, the visibility of the marine subject can be reliably improved.

[0037] <2. Operation> Figure 2 shows the operation of the steering support device 4. The steering support device 4 may assist in steering the ship by performing the processes in steps S11 to S17.

[0038] In step S11, the image acquisition unit 41 acquires an image from the imaging device 2. If the ship is equipped with multiple imaging devices 2, the image acquisition unit 41 may acquire an image from each imaging device 2.

[0039] In step S13, the measurement result acquisition unit 42 acquires measurement results from the radar device 3 in the image acquisition direction. If the ship is equipped with multiple imaging devices 2, the measurement result acquisition unit 42 may acquire measurement results from each of the multiple imaging devices 2 in the image acquisition direction.

[0040] In step S15, the detection unit 43 distinguishes and detects land-based subjects located on land and sea-based subjects located at sea among the subjects in the image. If the ship is equipped with multiple imaging devices 2, the detection unit 43 may distinguish and detect land-based subjects and sea-based subjects in each of the images from the multiple imaging devices 2.

[0041] In step S17, the display control unit 44 displays the image with the visibility of land subjects in the image reduced to that of sea subjects, based on the detection results in step S15. If the vessel is equipped with multiple imaging devices 2, the display control unit 44 may display the image from each of the multiple imaging devices with the visibility of land subjects reduced to that of sea subjects. Once the processing in step S17 is completed, the process may proceed to step S11 described above.

[0042] <3. Example of display screen> Figure 3 shows an example of a display screen. The upper part of the figure shows an image captured by the imaging device 2, and the lower part of the figure shows an image displayed by the display control unit 44. As shown in this figure, according to the steering support device 4 of this embodiment, the visibility of land subjects is reduced compared to the visibility of sea subjects in the image when the image is displayed. In this figure, as an example, the brightness and sharpness of land subjects such as ports, cars, and warehouses are reduced, while the brightness and sharpness of ships and the sea are increased.

[0043] <4. Variation> In the above embodiment, the piloting support device 4 was described as having a measurement result acquisition unit 42 and a display unit 45, but it is not necessary to have either of these. For example, if the piloting support device 4 does not have a measurement result acquisition unit 42, the detection unit 43 may detect the movement of a subject using multiple images, thereby classifying each subject as either a stationary object or a moving object. The detection unit 43 may then distinguish between stationary objects and moving objects on stationary objects as land subjects, and moving objects not located on stationary objects as sea subjects, and detect them accordingly. If the piloting support device 4 does not have a display unit 45, the display control unit 44 may cause an external display piloting support device 4 to display the images.

[0044] Furthermore, although the piloting support device 4 has been described as being connected to an external imaging device 2 and radar device 3, it may also have at least one of these.

[0045] Furthermore, although it has been explained that the measurement result detection unit 43 acquires numerical data from the radar device 3 as measurement results for each object in the imaging direction, indicating the bearing relative to the direction of travel and the distance from the ship, it is also possible to acquire a display image showing the display screen of the radar device 3 as the measurement result. For example, the measurement result detection unit 43 may acquire the measurement result by imaging the display screen of the radar device 3, or by acquiring display data from the radar device 3. The display screen of the radar device 3 may show the relative positions of the ship and each object around the ship on a coordinate plane, and may also show whether each surrounding object is stationary or not. In this case, the detection unit 43 may perform image recognition on the display image of the radar device 3 to distinguish between land objects and sea objects. The detection unit 43 may use image recognition to extract each object in the imaging direction from among the objects around the ship shown in the display image, and identify the position information of each extracted object (for example, information showing the bearing of the object relative to the direction of travel and the distance from the ship to the object). The detection unit 43 may compare the position of each subject in the image with the position of each object indicated by the measurement results from the radar device 3, and associate each subject in the image with one of the objects indicated by the measurement results. The detection unit 43 may identify each extracted object as either a stationary object or a moving object based on whether or not it is shown as a stationary object on the display image of the radar device 3, and based on this identification result, it may distinguish and detect each subject as either a land subject or a sea subject. If stationary objects and moving objects are distinguished by display color or the like in the display image of the radar device 3, the detection unit 43 may perform image analysis on the display image of the radar device 3 to distinguish each object as either a stationary object or a moving object.

[0046] Furthermore, various embodiments of the present invention may be described with reference to flowcharts and block diagrams, where a block may represent (1) a stage in a process in which an operation is performed or (2) a section of a device having the role of performing an operation. Specific stages and sections may be implemented by dedicated circuits, programmable circuits supplied with computer-readable instructions stored on a computer-readable medium, and / or processors supplied with computer-readable instructions stored on a computer-readable medium. Dedicated circuits may include digital and / or analog hardware circuits, and may include integrated circuits (ICs) and / or discrete circuits. Programmable circuits may include reconfigurable hardware circuits, including logical AND, logical OR, logical XOR, logical NAND, logical NOR, and other logic operations, flip-flops, registers, memory elements such as field-programmable gate arrays (FPGAs), programmable logic arrays (PLAs), etc.

[0047] Computer-readable media may include any tangible device capable of storing instructions to be executed by a suitable device, and as a result, computer-readable media having instructions stored therein will comprise a product containing instructions that can be executed to create means for performing operations specified in a flowchart or block diagram. Examples of computer-readable media may include electronic storage media, magnetic storage media, optical storage media, electromagnetic storage media, semiconductor storage media, etc. More specific examples of computer-readable media may include floppy disks, diskettes, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), electrically erasable programmable read-only memory (EEPROM), static random access memory (SRAM), compact disk read-only memory (CD-ROM), digital versatile disk (DVD), Blu-ray (RTM) disk, memory stick, integrated circuit card, etc.

[0048] Computer-readable instructions may include assembler instructions, instruction set architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, state setting data, or source code or object code written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Smalltalk®, Java®, C++, and traditional procedural programming languages ​​such as the C programming language or similar programming languages.

[0049] Computer-readable instructions may be provided locally or via a wide area network (WAN), such as a local area network (LAN) or the internet, to a processor or programmable circuit of a general-purpose computer, a special-purpose computer, or other programmable data processing device, and these instructions may be executed to create means for performing operations specified in a flowchart or block diagram. Examples of processors include computer processors, processing units, microprocessors, digital signal processors, controllers, microcontrollers, and the like.

[0050] Figure 4 shows an example of a computer 2200 in which multiple aspects of the present invention may be embodied in whole or in part. A program installed on the computer 2200 can cause the computer 2200 to function as an operation or one or more sections of an apparatus according to an embodiment of the present invention, or to execute such operation or one or more sections, and / or to cause the computer 2200 to execute a process or a stage of such process according to an embodiment of the present invention. Such a program may be executed by the CPU 2212 to cause the computer 2200 to perform a particular operation associated with some or all of the blocks in the flowcharts and block diagrams described herein.

[0051] The computer 2200 according to this embodiment includes a CPU 2212, RAM 2214, a graphics controller 2216, and a display device 2218, which are interconnected by a host controller 2210. The computer 2200 also includes input / output units such as a communication interface 2222, a hard disk drive 2224, a DVD-ROM drive 2226, and an IC card drive, which are connected to the host controller 2210 via an input / output controller 2220. The computer also includes legacy input / output units such as a ROM 2230 and a keyboard 2242, which are connected to the input / output controller 2220 via an input / output chip 2240.

[0052] The CPU 2212 operates according to programs stored in the ROM 2230 and RAM 2214, thereby controlling each unit. The graphics controller 2216 retrieves image data generated by the CPU 2212 from a frame buffer provided in RAM 2214 or from itself, and displays the image data on the display device 2218.

[0053] The communication interface 2222 communicates with other electronic devices via a network. The hard disk drive 2224 stores programs and data used by the CPU 2212 in the computer 2200. The DVD-ROM drive 2226 reads programs or data from the DVD-ROM 2201 and provides them to the hard disk drive 2224 via the RAM 2214. The IC card drive reads programs and data from the IC card and / or writes programs and data to the IC card.

[0054] The ROM 2230 stores boot programs and / or programs that depend on the computer 2200's hardware, which are executed by the computer 2200 when activated. The input / output chip 2240 may also connect various input / output units to the input / output controller 2220 via parallel ports, serial ports, keyboard ports, mouse ports, etc.

[0055] The program is provided on a computer-readable medium such as a DVD-ROM 2201 or an IC card. The program is read from the computer-readable medium and installed on a hard disk drive 2224, RAM 2214, or ROM 2230, which are also examples of computer-readable medium, and executed by the CPU 2212. The information processing described within these programs is read by the computer 2200, resulting in coordination between the program and the various types of hardware resources described above. The apparatus or method may be configured to realize the manipulation or processing of information in accordance with the use of the computer 2200.

[0056] For example, when communication is performed between a computer 2200 and an external device, the CPU 2212 may execute a communication program loaded into RAM 2214 and, based on the processing described in the communication program, instruct the communication interface 2222 to perform communication processing. Under the control of the CPU 2212, the communication interface 2222 reads transmission data stored in a transmission buffer processing area provided in a recording medium such as RAM 2214, a hard disk drive 2224, a DVD-ROM 2201, or an IC card, transmits the read transmission data to the network, or writes received data received from the network to a reception buffer processing area provided on the recording medium.

[0057] Furthermore, the CPU 2212 may read all or necessary parts of files or databases stored on external storage media such as the hard disk drive 2224, DVD-ROM drive 2226 (DVD-ROM 2201), or IC card into the RAM 2214, and perform various types of processing on the data in the RAM 2214. The CPU 2212 then writes the processed data back to the external storage media.

[0058] Various types of information, such as various types of programs, data, tables, and databases, may be stored on the recording medium and subjected to information processing. The CPU 2212 may perform various types of processing on the data read from RAM 2214, including various types of operations, information processing, conditional judgments, conditional branching, unconditional branching, information retrieval / replacement, etc., as described throughout this disclosure and specified by the program instruction sequence, and write the results back to RAM 2214. The CPU 2212 may also retrieve information in files, databases, etc., within the recording medium. For example, if multiple entries are stored in the recording medium, each having an attribute value of a first attribute associated with an attribute value of a second attribute, the CPU 2212 may search among the multiple entries for an entry that matches the condition for which the attribute value of the first attribute is specified, read the attribute value of the second attribute stored in that entry, and thereby obtain the attribute value of the second attribute associated with the first attribute that satisfies a predetermined condition.

[0059] The programs or software modules described above may be stored on or near computer 2200 on a computer-readable medium. Alternatively, recording media such as hard disks or RAM provided within a server system connected to a dedicated communication network or the Internet can be used as computer-readable media, thereby providing programs to computer 2200 via the network.

[0060] Although the present invention has been described above using embodiments, the technical scope of the present invention is not limited to the scope described in the above embodiments. It will be apparent to those skilled in the art that various modifications or improvements can be made to the above embodiments. It will be clear from the claims that such modified or improved forms may also be included in the technical scope of the present invention.

[0061] It should be noted that the execution order of operations, procedures, steps, and stages in the apparatus, systems, programs, and methods shown in the claims, specifications, and drawings is not explicitly stated as "before," "prior to," etc., and that these can be implemented in any order unless the output of a previous process is used in a later process. Even if the operation flow in the claims, specifications, and drawings is described using phrases such as "first," "next," etc. for convenience, it does not mean that it is essential to perform the operations in that order. [Explanation of symbols]

[0062] 1 System 2. Imaging device 3. Radar equipment 4. Pilot Support System 41 Image acquisition unit 42 Measurement result acquisition section 43 Detection unit 44 Display Control Unit 45 Display section 2200 Computers 2201 DVD-ROM 2210 Host Controller 2212 CPU 2214 RAM 2216 Graphics Controller 2218 Display Devices 2220 Input / Output Controller 2222 Communication Interface 2224 Hard Disk Drive 2226 DVD-ROM drive 2230 ROM 2240 Input / Output Chip 2242 keyboard

Claims

1. An image acquisition unit that acquires images from an imaging device installed on the ship, including land-based subjects located on land and sea-based subjects located at sea, A detection unit that distinguishes between land-based subjects and sea-based subjects among the subjects in the aforementioned image, A display control unit, based on the detection results from the detection unit, displays the image with the visibility of land subjects in the image reduced to that of sea subjects, A device equipped with the following features.

2. An image acquisition unit that acquires images from multiple imaging devices installed on the ship, A detection unit that distinguishes and detects land-based subjects located on land and sea-based subjects located at sea from among the subjects in each of the aforementioned images, A display control unit, based on the detection results from the detection unit, displays each image with the visibility of the land subject in each image reduced to that of the sea subject, A device equipped with the following features.

3. An image acquisition unit that acquires images from an imaging device installed on the ship, A detection unit that distinguishes and detects land-based subjects located on land and sea-based subjects located at sea from among the subjects in the aforementioned image, A display control unit, based on the detection results from the detection unit, displays the land subject and the sea subject in the image, respectively, and displays the image with the visibility of the land subject reduced to that of the sea subject. A device equipped with the following features.

4. The apparatus according to any one of claims 1 to 3, wherein the detection unit performs image recognition on the image to detect each subject.

5. The system includes a measurement result acquisition unit that acquires measurement results in the image acquisition direction from a radar device installed on the ship, The apparatus according to claim 4, wherein the detection unit distinguishes between the land subject and the sea subject based on the measurement results.

6. The apparatus according to claim 5, wherein the detection unit identifies stationary objects and moving objects on stationary objects as land objects among the objects indicated by the measurement results of the radar device, and detects subjects in the image that correspond to land objects as land subjects.

7. The apparatus according to claim 5, wherein the detection unit identifies moving objects that are not located on stationary objects among the moving objects indicated by the measurement results of the radar device as sea objects, and detects subjects in the image that correspond to sea objects as sea subjects.

8. The measurement result acquisition unit acquires a display image showing the display screen of the radar device as the measurement result. The apparatus according to claim 5, wherein the detection unit further performs image recognition on the displayed image to distinguish between the land subject and the sea subject.

9. The apparatus according to any one of claims 1 to 3, wherein the display control unit reduces at least one of the brightness, contrast, or sharpness of a land subject in the image.

10. The apparatus according to any one of claims 1 to 3, wherein the display control unit increases at least one of the brightness, contrast, or sharpness of a marine subject in the image.

11. An image acquisition step in which a computer acquires an image from an imaging device installed on its ship that includes a land-based subject located on land and a sea-based subject located at sea, A detection step in which the computer distinguishes and detects land-based subjects and sea-based subjects among the subjects in the image, A display control step in which a computer, based on the detection results from the detection step, displays the image with the visibility of land subjects in the image reduced to that of sea subjects, A method for providing this.

12. An image acquisition step in which a computer acquires images from each of a plurality of imaging devices installed on its ship, A detection step in which the computer distinguishes and detects, among the subjects in each of the images, land subjects located on land and sea subjects located at sea, A display control step in which a computer, based on the detection results from the detection step, displays each image with the visibility of the land subject in each image reduced to that of the sea subject, A method for providing this.

13. An image acquisition step in which a computer acquires an image from an imaging device installed on its own ship, A detection step in which the computer distinguishes and detects, among the subjects in the image, land-based subjects located on land and sea-based subjects located at sea, A display control step in which a computer displays land and sea subjects in the image based on the detection results from the detection step, and displays the image with the visibility of the land subjects reduced to that of the sea subjects, A method for providing this.

14. Computers, An image acquisition unit that acquires images from an imaging device installed on the ship, including land-based subjects located on land and sea-based subjects located at sea, A detection unit that distinguishes between land-based subjects and sea-based subjects among the subjects in the aforementioned image, Based on the detection results from the detection unit, the display control unit displays the image with the visibility of land subjects in the image reduced to that of sea subjects. A program that makes it function as such.

15. Computers, An image acquisition unit that acquires images from multiple imaging devices installed on the ship, A detection unit that distinguishes and detects land-based subjects located on land and sea-based subjects located at sea from among the subjects in each of the aforementioned images, Based on the detection results from the detection unit, the display control unit displays each image with the visibility of the land subject in each image reduced to that of the sea subject. A program that makes it function as such.

16. Computers, An image acquisition unit that acquires images from an imaging device installed on the ship, A detection unit that distinguishes and detects land-based subjects located on land and sea-based subjects located at sea from among the subjects in the aforementioned image, Based on the detection results from the detection unit, the display control unit displays the land and sea subjects in the image, respectively, and displays the image with the visibility of the land subjects reduced to that of the sea subjects. A program that makes it function as such.

Images