JP2016071060A - Image display device and image display method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique for appropriately displaying a map image even when a display range of the displayed map image is newly set.SOLUTION: During the continuation of scale reduction/enlargement operation and the like, a map image RI in a raster format is displayed on a display unit 2. In this case, map data is read from a storage unit by following the scale reduction/enlargement operation and the like by a user, eliminating the need to draw a map image VI in a vector format again. Using the map image RI in a raster format during the continuation of scale reduction/enlargement operation and the like by a user enables a map image to be displayed on the display unit 2 by quickly following the operation of the user. Especially, generation of a non-image region is prevented during the continuation of scale reduction/enlargement operation and the like since the map image RI in a raster format whose region is larger than the display unit 2 is used.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a technique for displaying an image.

  2. Description of the Related Art Conventionally, a technique is known in which a user freely sets a display range such as a scale or position of a map image displayed on a display and displays the map image in a range desired by the user. For example, in the technique of Patent Document 1, the user can freely set the display angle of the map image.

JP 2010-175815 A

  When the display range of the map image is newly set, a process of reading the map data again from the memory and a process of redrawing the map image are required. When such processing is performed, a time difference occurs between the user's setting operation and the update of the map image, and it becomes difficult to display a smooth map image. Further, when the map image is reduced or moved, the display range of the map image is different from the display size, and therefore, an imageless area where no image is displayed is generated at the end of the display until the map image is updated. Generation | occurrence | production of this non-image area | region reduces the visibility of a map image, and has become the subject which should be solved.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a technique for appropriately displaying a map image even when a display range of the displayed map image is newly set.

  In order to solve the above-mentioned problems, the invention of claim 1 is an image display device for displaying an image, wherein an acquisition means for acquiring map data and a vector-format vector map image using the map data are generated, Display control means for displaying the vector map image on a display means, and reception means for receiving a scale operation for changing the scale of the vector map image displayed on the display means, wherein the display control means includes the reception When the means accepts the start of the scale operation, a raster format raster map image is generated using the vector map image, and the raster map image is displayed on the display means while the scale operation is continued.

  According to a second aspect of the present invention, in the image display device according to the first aspect, the display control means generates the raster map image including an area outside the display area of the display means.

  The invention according to claim 3 is the image display device according to claim 1 or 2, wherein the display control means uses the map data when the accepting means accepts the end of the scale operation. A vector map image having a scale designated by the scale operation is generated, and the vector map image is displayed on the display means.

  According to a fourth aspect of the present invention, in the image display device according to the second aspect, the scale operation is an operation for reducing the vector map image displayed on the display means.

  The invention according to claim 5 is the image display device according to any one of claims 1 to 4, wherein the acquisition unit acquires the map data from a predetermined server device via a network, and the display control unit. If the acquisition unit becomes unable to acquire the map data while the scale operation is continued, after the acquisition unit can acquire the map data, the scale data is acquired using the acquired map data. A vector map image having a scale specified by the operation is generated, and the vector map image is displayed on the display means.

  Further, the invention of claim 6 is an image display method for displaying an image, wherein (a) a step of acquiring map data, (b) generating a vector map image in vector format using the map data, A step of displaying the vector map image on display means, (c) a step of accepting a scale operation for changing the scale of the vector map image displayed on the display means, and (d) accepting the start of the scale operation. A raster map image in a raster format is generated using the vector map image, and the raster map image is displayed on the display means while the scale operation is continued.

  The invention of claim 7 is a program executable by a computer included in an image display device for displaying an image, wherein (a) acquiring map data in the computer; and (b) the map data. Generating a vector map image in a vector format using, and displaying the vector map image on a display means; and (c) accepting a scale operation for changing the scale of the vector map image displayed on the display means. (D) when the start of the scale operation is accepted, a raster map image in a raster format is generated using the vector map image, and the raster map image is displayed on the display means during the continuation of the scale operation. And causing the process to be executed.

  According to the first to seventh aspects of the invention, when the accepting unit accepts the start of the scale operation, the raster map image in the raster format is generated using the vector map image and displayed on the display unit. Can be provided.

  Further, according to the invention of claim 2, since the raster map image is generated using the vector map image including the area outside the display area of the display means, an appropriate area when the scale operation is performed. A map image can be displayed.

  In particular, according to the invention of claim 3, when the accepting means accepts the end of the scale operation, the map data is used to generate a vector map image of the scale designated by the scale operation and display it on the display means. Appropriate scale map images can be displayed.

  In particular, according to the invention of claim 4, even when the vector map image is reduced, the map image can be displayed in the peripheral area of the display means.

  In particular, according to the invention of claim 5, even when the acquisition unit becomes unable to acquire map data during accepting a scale operation, a map image of an appropriate scale can be displayed.

FIG. 1 is a diagram showing an outline of an image display device. FIG. 2 is a diagram illustrating a configuration of the image display apparatus according to the first embodiment. FIG. 3 is a diagram illustrating a procedure for displaying an image. FIG. 4 is a diagram illustrating a procedure for displaying an image. FIG. 5 is a diagram illustrating processing steps of the image display apparatus according to the first embodiment. FIG. 6 is a diagram illustrating processing steps of the image display apparatus according to the first embodiment. FIG. 7 is a diagram illustrating a configuration of an image display apparatus according to the second embodiment. FIG. 8 is a diagram illustrating processing steps of the image display apparatus according to the second embodiment.

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

<1. First Embodiment>
<1-1. Overview>
FIG. 1 shows an outline of the image display device 1. The image display device 1 is a device that displays a map image on a display unit 2 serving as a display. For example, a desktop or tablet computer, a smartphone, or a navigation device mounted on a vehicle.

  When the user wants to enlarge, reduce or move (scroll) the map image displayed on the display unit 2, if the display unit 2 includes a touch panel, a touch operation (touch) with a finger UF is performed.

  The operation by touching the finger UF includes, for example, a tap for bringing a finger or the like into contact with the display unit 2 once, a pinch-in that gradually reduces the interval between two fingers that are in contact with the display unit 2, or the display unit 2. For example, a pinch out that gradually increases the interval between two fingers or the like, a drag that moves a finger or the like in contact with the display unit 2, and the like.

  When the map image is enlarged and displayed by the pinch-in operation, for example, as shown in FIG. 1, when the user operates the finger UF in the direction PI (pinch-in operation) on the display unit 2 on which the map image is displayed, the map image is displayed. Enlarged display. At this time, the display range of the map image is reduced in the direction RD, and a non-image area BO in which no image is displayed is generated in the peripheral area of the display unit 2 until the update of the map image is completed. Generation | occurrence | production of this non-image area | region BO becomes a factor which reduces the visibility of a map image.

  Therefore, in the embodiment of the present invention, when the user starts a touch operation on the display unit 2 on which the map image is displayed, an area larger than the display unit 2, that is, an area outside the display area of the display unit 2 is included. A raster-format map image (raster map image) is generated, and the map image is moved and displayed in accordance with a user operation. Since the map image of the area larger than the display unit 2 is generated in advance, the occurrence of the non-image area BO can be prevented even if the map image is reduced or moved. In addition, by using a raster-format map image, a continuous map update process in accordance with the user's operation can be avoided, and a quick map display becomes possible.

  When the map image is enlarged, the map becomes detailed and the display range decreases. On the other hand, when the map image is reduced, the map becomes wide and the display range is expanded. When the scale of the map is enlarged (for example, the scale is 50 [m] to 10 [km]), the map image is reduced. On the other hand, when the scale of the map is reduced (for example, the scale is 10 [km] to 50 [m]), the map image is enlarged. Hereinafter, an operation for enlarging or reducing a map image or a scale may be abbreviated as an enlarging / reducing operation.

<1-2. Configuration>
FIG. 2 shows the configuration of the image display apparatus 1. The image display device 1 is an electronic control device that is controlled by a microcomputer to generate and display an image. The image display device 1 includes a control unit 11, a display control unit 12, a storage unit 13, and a position acquisition unit 14. The image display device 1 is connected to the display unit 2. The image display device 1 and the display unit 2 constitute an image display system 10.

  The control unit 11 is a microcomputer including a CPU, a RAM, and a ROM. The control unit 11 controls the entire image display device 1. The control unit 11 includes a reception unit 11a.

  The accepting unit 11a accepts operation information transmitted from an operation unit 2a, which will be described later, indicating the user's operation content on the operation unit 2a. The control unit 11 recognizes what operation the user has performed on the operation unit 2a based on the received operation information. The operation that the user performs on the operation unit 2a is, for example, a scale operation that changes the scale of the map image. The accepting unit 11a accepts the start of the operation when the user's finger or the like comes into contact with the operation unit 2a, and accepts the end of the operation when the user's finger or the like leaves the operation unit 2a. The reception unit 11a functions as a reception unit.

  The display control unit 12 reads out map data 13b described later, generates a map image, and causes the display unit 2 described later to display the generated map image. The functions of the display control unit 12 will be described later. The display control unit 12 functions as a display control unit.

  The storage unit 13 is a storage medium that stores data. For example, it is a nonvolatile memory such as an EEPROM (Electrical Erasable Programmable Read-Only Memory), a flash memory, or a hard disk drive equipped with a magnetic disk. The storage unit 13 stores a program 13a and map data 13b.

  The program 13 a is firmware that is read by the control unit 11 and executed for the control unit 11 to control the image display apparatus 1.

  The map data 13b is vector format map data composed of vector data. It is composed of a plurality of mesh unit map data divided by a predetermined latitude range and longitude range. The unit map data includes three types: wide area, middle area, and details.

  The position acquisition unit 14 acquires position information indicating a current location based on a signal received from a GPS satellite. The position acquisition unit transmits the acquired position information to the control unit 11.

  The image display device 1 is connected to the display unit 2 as described above. The display unit 2 is a display device that displays images such as figures and symbols and visually presents information to the user of the image display device 1. For example, a liquid crystal display. The display unit 2 includes an operation unit 2a.

  The operation unit 2 a detects an operation caused by contact of the user's finger or the like with the display unit 2, and transmits the detected operation information to the control unit 11. The operation unit 2a is a touch panel, for example. The control unit 11 recognizes what operation the user has performed on the operation unit 2a based on the operation information transmitted from the operation unit 2a. For example, the above-described tap, pinch-in, pinch-out, and drag operations are performed by touching the display unit 2 with a user's finger or the like.

  Functions provided in the display control unit 12 will be described. The display control unit 12 includes an acquisition unit 12a, a memory 12b, a generation unit 12c, and an output unit 12d.

  The acquisition unit 12a reads and acquires the map data 13b from the storage unit 13. Further, when the image display apparatus 1 moves and the map data to be displayed on the display unit 2 is insufficient, the acquisition unit 12a determines the moving direction and acquires the insufficient map data 13b from the storage unit 13. The acquisition unit 12a functions as an acquisition unit.

  A map image to be displayed on the display unit 2 is drawn on the memory 12b. For example, Video-RAM. The capacity of the memory 12b is set larger than the capacity of the display area of the display unit 2.

  The generation unit 12c generates a map image (vector map image) in vector format using the map data 13b (vector data) acquired by the acquisition unit 12a from the storage unit 13, and draws it in the memory 12b. In addition, when the receiving unit 11a receives an operation on the operation unit 2a, the generating unit 12c generates a raster-format map image using the map data 13b (vector data) and draws it in the memory 12b. The operation accepted by the operation unit 2a at this time is an operation for the user to enlarge, reduce, and move the map image.

  The output unit 12d reads the map image in the vector format or the raster format drawn in the memory 12b and outputs it to the display unit 2. Therefore, the output unit 12d outputs a map image in a vector format when the operation unit 2a does not accept a user operation, and outputs a map image in a raster format when the operation unit 2a accepts a user operation.

<1-3. Image display procedure>
3 and 4 show a procedure in which the display control unit 12 displays a map image on the display unit 2. FIG. 3 shows a procedure in which the display control unit 12 displays a vector-format map image on the display unit 2. In FIG. 4, after the map image in the vector format is displayed on the display unit 2, the user performs a pinch-in operation on the operation unit 2a to reduce the map image, that is, to widen the area, and the display control unit 12 displays the map in the raster format. A procedure for displaying an image on the display unit 2 will be described.

  In FIG. 3, the acquisition unit 12a reads and acquires nine pieces of map data 13b corresponding to meshes in the vertical, horizontal, and diagonal directions with the current position MP of the image display device 1 as the center (FIG. 3). (1)). The map data 13b is vector format map data. Further, when the image display device 1 moves and the map data 13b to be displayed on the display unit 2 is insufficient, the acquisition unit 12a determines the moving direction of the current position MP and stores the insufficient map data 13b in the storage unit 13. Get from.

  The generation unit 12c draws a map image in vector format in the memory 12b using the nine pieces of map data 13b (FIG. 3 (2)). Further, the generation unit 12c specifies a display area DE having the same size as the display unit 2 with the current position MP as the center for the drawn vector-format map image. The position of the display area DE moves with the movement of the current position MP.

  The output unit 12d outputs and displays the map image VI in the display area DE on the display unit 2 among the vector-format map images VI drawn in the memory 12b (FIG. 3 (3)).

  When the operation unit 2a accepts the start of the map image enlargement operation by the user (FIG. 4 (1)), the generation unit 12c centers on the current position MP with respect to the vector-format map image VI drawn in the memory 12b. The display area DL larger than the display unit 2 is designated (FIG. 4 (2)).

  Next, when the display area DL is designated, the generation unit 12c draws a raster-format map image RI in the memory 12b for the display area DL in the vector-format map image VI ((3) in FIG. 4). The output unit 12d reads a raster-format map image RI for the display area DL drawn in the memory 12b and outputs the read map image RI to the display unit 2.

  Then, the generation unit 12c generates a raster-format map image RI corresponding to the enlargement width specified by the user's operation, and redraws it in the memory 12b. The output unit 12d reads the image drawn in the memory 12b and outputs it to the display unit 2 (FIG. 4 (4)).

  As described above, the raster-type map image RI is displayed on the display unit 2 while the scale operation is continued. In this case, the acquisition unit 12a acquires the map data 13b from the storage unit 13 following the user's scale operation and the like, and the generation unit 12c does not need to redraw the vector-format map image VI. On the other hand, when the map image VI in the vector format is redrawn, the reading of the map data 13b and the drawing process must always be executed in accordance with the scale operation and the scale operation cannot be quickly followed. Therefore, by using the raster-format map image RI while the user's scale operation or the like is continued, the map image can be displayed on the display unit 2 following the user's operation quickly. In particular, since the raster-format map image RI in an area larger than the display unit 2 is used, it is possible to prevent the occurrence of the non-image area BO while the scale operation or the like is continued.

  When the operation unit 2a receives a stop of the map image enlargement / reduction operation or movement operation by the user, the generation unit 12c generates a vector-format map image VI using the map-format map data 13b re-acquired by the acquisition unit 12a. Redraw in the memory 12b. The output unit 12d reads the image drawn in the memory 12b and outputs it to the display unit 2. Thereby, the user can refer to the map data 13b in the vector format in which the enlargement / reduction operation or the like is performed.

<1-4. Processing steps>
FIG. 5 shows processing steps of the image display device 1 according to the first embodiment. This processing step is repeatedly executed at a predetermined cycle.

  First, the acquisition unit 12a acquires map data 13b from the storage unit 13 (step S11).

  Next, the generation unit 12c of the display control unit 12 generates a map image in vector format (step S12).

  When the generation unit 12c generates a map image in the vector format, the output unit 12d outputs the map image in the vector format and displays it on the display unit 2 (step S13).

  Next, the reception unit 11a determines whether or not the operation unit 2a has been operated to change the scale or position of the map image (step S14).

  When the accepting unit 11a determines that there has been an operation to change the scale or position (Yes in step S14), an operation process is executed (step S15). Details of the operation process will be described later.

  On the other hand, when the reception unit 11a determines that there is no operation for changing the scale or position (No in step S14), or when the operation process is executed, it is determined whether or not the display of the map image should be terminated (step S16). ). That is, the reception unit 11a determines whether or not the user has performed an operation for ending the map image on the operation unit 2a.

  When the reception unit 11a determines that the display of the map image should be terminated (Yes in step S16), the processing process ends.

  On the other hand, the control unit 11 determines whether or not scale position data corresponding to the user's scale operation or movement operation is stored (step S17).

  If it is determined that new scale data is stored (Yes in step S17), the process returns to step S11, and the acquisition unit 12a acquires map data 13b corresponding to the new scale data from the storage unit 13. Thereafter, step S12 and subsequent steps are executed again.

  On the other hand, if it is determined that new scale position data is not stored (No in step S17), the process returns to step S14, and whether or not the accepting unit 11a has operated the operation unit 2a to change the scale or position of the map image. to decide. Thereafter, step S15 or step S16 and subsequent steps are executed again.

  Next, details of the scale position processing in step S15 will be described. FIG. 6 shows details of the scale position processing.

  When the scale position processing is executed, the generation unit 12c generates a raster-format map image based on the vector-format map image generated in step S12 (step S15a).

  When the generation unit 12c generates a raster-format map image, the output unit 12d outputs the raster-format map image generated by the generation unit 12c and displays the map image on the display unit 2 (step S15b).

  The receiving unit 11a determines whether or not the user's scale operation or position operation continues (step S15c).

  If it is determined that the scale operation or the position operation is not continued (No in step S15c), the process returns to FIG. 5, and step S16 and subsequent steps are executed.

  On the other hand, if it is determined that the scale operation or the position operation is continuing (Yes in step S15c), the receiving unit 11a stores the scale or position value operated by the user as the scale position data (step S15d). The scale position data indicates the scale or distance in the map display. For example, 10 km or 2 km.

  When the reception unit 11a stores the scale position data, the generation unit 12c changes the scale or position of the raster map image with the scale or position value indicated by the scale position data (step S15e). That is, the raster map image is enlarged, reduced or moved.

  Here, the processing process returns to step S15b, and the output unit 12d outputs a raster-format map image whose scale has been changed, and displays it on the display unit 2. Thereby, the user can browse the map image of the scale or the position input to the operation unit 2a.

  As described above, in the embodiment of the present invention, when the reception unit 11a receives the start of the user's scale operation or the like, the display control unit 12 generates a raster-format raster map image using the vector map image, and the scale is reduced. During the operation or the like, the raster map image is displayed on the display unit 2.

  Thereby, since the raster map image is displayed on the display unit 2 while the scale operation or the like is continued, the map image can be displayed on the display unit 2 following the user's operation quickly. In particular, since the raster-format map image RI in an area larger than the display unit 2 is used, it is possible to prevent the occurrence of an imageless area while the scale operation or the like is continued. When the map image VI in the vector format is used, the reading of the map data 13b and the image generation must be executed at any time according to the scale operation or the like, and the scale operation or the like cannot be followed quickly. The non-image area BO is generated.

  Further, when displaying the raster-format map image RI on the display unit 2 while the scale operation or the like is continued, the display control unit 12 generates a raster-format map image RI including an area outside the display area of the display unit 2. To display. Thereby, even if scale operation etc. reduce a map image, the non-display area | region BO is not produced, but high operativity and visibility can be maintained.

  Further, when the accepting unit 11a accepts the end of the scale operation or the like, the display control unit 12 generates a map-format map image VI of the scale specified by the scale operation or the like using the map data 13b, and the map image Is displayed on the display unit 2.

<2. Second Embodiment>
<2-1. Overview>
In the first embodiment described above, the map data 13b is stored in the storage unit 13, and the acquisition unit 12a acquires the map data 13b from the storage unit 13.

  In the second embodiment, the map data is stored in a server device located outside the image display device 1. Therefore, the acquisition unit 12a acquires map data from the server device via the network. Further, when the map data is acquired from the server device, if the map data cannot be temporarily acquired due to a communication abnormality or the like, the map data is acquired after the communication abnormality or the like is resolved.

  Thereby, the image display apparatus 1 can produce | generate a map image using the newest map data by updating map data within a server apparatus. Even if the map data cannot be temporarily acquired due to a communication abnormality or the like, the map data is acquired after the communication abnormality or the like is resolved, so that the generation of the map image is not disabled.

<2-2. Configuration>
The second embodiment includes the same configuration and processing steps as those of the first embodiment. Therefore, differences from the first embodiment will be mainly described below. FIG. 7 shows the configuration of the second embodiment.

  A network 3 and a server device 4 are located outside the image display device 1. Further, the image display device 1 includes a communication unit 15, and the control unit 11 includes a determination unit 11b.

  The network 3 is an information network in which various communication devices are connected to each other using wireless communication technology. For example, an internet line or a telephone line. The image display apparatus 1 can transmit and receive various data by connecting to the network 3.

  The server device 4 is a communication device that is connected to the network 3 and provides the map data 4 a to the image display device 1.

  The map data 4a is vector format map data composed of vector data. It is composed of a plurality of mesh unit map data divided by a predetermined latitude range and longitude range. The unit map data includes three types: wide area, middle area, and details. The map data 4a is constantly updated to the latest data by the operator of the server device 4. The storage unit 13 does not need to store map data. This is because in the second embodiment, the map data 4 a can be acquired from the server device 4 via the network 3.

  The communication unit 15 includes an antenna, and performs wireless communication with the server device 4 via the network 3 using information communication technology such as WiMAX (Worldwide Interoperability for Microwave Access) and LTE (Long Term Evolution). The communication unit 15 receives the map data 4 a from the server device 4.

  When acquiring the map data 4a from the server device 4, the determination unit 11b determines whether or not the communication abnormality has been resolved if the map data 4a cannot be temporarily acquired due to a communication abnormality or the like. That is, the determination unit 11b constantly monitors the communication state of the communication unit 15, and when the communication unit 15 detects that communication has been recovered after the communication with the server device 4 is disabled, the communication abnormality is resolved. judge.

<2-3. Processing steps>
FIG. 8 shows details of the operation processing in the second embodiment. In the operation process in the second embodiment, step S15f and step S15g are further executed with respect to the operation process in the first embodiment.

  When step S15e is executed, the determination unit 11b monitors the communication state of the communication unit 15 to determine whether the acquisition unit 12a can acquire the map data 4a from the server device 4 via the communication unit 15. (Step S15f).

  When the determination unit 11b determines that the map data 4a can be acquired (Yes in step S15f), the acquisition unit 12a acquires the map data 4a corresponding to the new scale position data from the server device 4. When the acquisition unit 12a acquires the map data 4a, and when the determination unit 11b determines that the map data 4a cannot be acquired (No in Step S15f), Steps S15b and subsequent steps are executed again.

  As described above, when the acquisition unit 12a becomes unable to acquire the map data 4a while the scale operation is continued, the raster-format map image RI is continuously displayed on the display unit 2. Thereafter, when the acquisition unit 12a can acquire the map data 4a, it acquires the map data 4a from the server device 4, generates a map image VI in a scale or position designated by a scale operation or the like, and the map image Is displayed on the display unit 2.

  Thereby, even if the acquisition part 12a becomes unable to acquire map data 4a during reception of scale operation etc., the map image of a suitable scale or position can be displayed.

<3. Third Embodiment>
<3-1. Configuration>
In the above-described embodiment, the display control unit 12 generates a vector map image in the vector format using the map data 13b, generates a raster map image in the raster format using the vector map image, and the raster map image. Is displayed on the display unit 2. Then, when the accepting unit 11a accepts the start of the scale operation, the display control unit 12 generates the raster map image again using the raster map image, and displays the raster map image while the scale operation is continued. 2 is displayed.

  In the third embodiment, the display control unit 12 generates a vector map image in the vector format using the map data 13b, generates a raster map image in the raster format using the vector map image, and the raster map. An image is displayed on the display unit 2. Then, when the accepting unit 11a accepts the start of the scale operation, the display control unit 12 generates the raster map image again using the raster map image, and displays the raster map image while the scale operation is continued. 2 is displayed.

<3-2. Addendum>
The third embodiment includes the following inventions.

  (Supplementary note) An image display device for displaying an image, wherein an acquisition means for acquiring map data, a vector-format vector map image is generated using the map data, and a raster-format raster is generated using the vector map image Display control means for generating a map image and displaying the raster map image on a display means; and accepting means for receiving a scale operation for changing the scale of the raster map image displayed on the display means; The control means generates a raster map image again using the raster map image when the accepting means accepts the start of the scale operation, and displays the raster map image during the continuation of the scale operation. An image display device characterized by being displayed on the screen.

<4. Modification>
The present invention is not limited to the above embodiment. It can be deformed. Hereinafter, modified examples will be described. The embodiments described above and below can be combined as appropriate.

  In the above embodiment, the map image VI in the vector format is displayed on the display unit 2 until the user performs a scale operation or the like. However, the map image VI need not be a vector format. That is, when displaying a map image, a luminance value is written to an address corresponding to each color of each pixel of the display of the V-RAM, and the video driver drives each corresponding pixel (for each color) according to the value of the V-RAM. . For this reason, when displaying a map image, map data (vector format) corresponding to the vehicle position (range of display map) is read from the map database, and rendering processing (rasterization... Each pixel / each color is performed based on the data. Conversion to luminance data). The data is stored in a drawing memory (address corresponding to pixel position). At this time, in order to smoothly perform scrolling and the like, this processing is performed on the map in a wider range than the display area of the navigation. Then, image data corresponding to the vehicle position (range of the display map) is read from the drawing memory and written into the V-RAM. As a result, the video driver draws a map around the vehicle on the display. In such a method, in order to speed up the processing during the enlargement / reduction operation (raster conversion and reading of map data are deleted), an enlarged / reduced image is generated by image processing from the rasterized map image (in the drawing memory) (dots). Or the like, and interpolating between them is cut out), and an image corresponding to the vehicle position is cut out from the image and displayed (written to the V-RAM).

  Moreover, in the said embodiment, the image display apparatus 1 and the display part 2 were comprised as a different body. However, the image display device 1 and the display unit 2 may be configured integrally.

  In the above embodiment, the communication unit 15 performs wireless communication. However, wired communication may be performed.

  Moreover, in the said embodiment, it was set as the navigation apparatus mounted in a desktop-type or tablet-type computer, a smart phone, and a vehicle as an example of the image display apparatus 1. FIG. However, the image display device 1 may be any device that displays a map image. Furthermore, the displayed image may not be a map image. Any image may be used as long as the user performs enlargement / reduction operation or movement operation.

  Further, the configuration described as hardware may be realized by software. On the other hand, the function described as software may be realized by hardware. Further, hardware or software may be realized by a combination of hardware and software. For example, the function of the touch panel may be configured by a contact type button, or may be configured by a button operation of a pointer with respect to a button displayed as an image.

DESCRIPTION OF SYMBOLS 1 Image display apparatus 2 Display part 11 Control part 12 Display control part 13 Storage part 14 Position acquisition part VI Vector map image RI Raster map image

Claims (7)

An image display device for displaying an image,
An acquisition means for acquiring map data;
Display control means for generating a vector map image in vector format using the map data and displaying the vector map image on a display means;
Receiving means for receiving a scale operation for changing the scale of the vector map image displayed on the display means;
With
The display control means generates a raster-format raster map image using the vector map image when the accepting means accepts the start of the scale operation, and displays the raster map image while the scale operation is continued. An image display device, characterized by being displayed on the display means. The image display device according to claim 1,
The image display device according to claim 1, wherein the display control unit generates the raster map image including a region outside a display region of the display unit. The image display device according to claim 1 or 2,
The display control means generates a vector map image at a scale designated by the scale operation using the map data when the accepting means accepts the end of the scale operation, and displays the vector map image. An image display device characterized by being displayed on the screen. The image display device according to claim 2,
The scale display operation is an operation for reducing the vector map image displayed on the display means. The image display device according to any one of claims 1 to 4,
The acquisition means acquires the map data from a predetermined server device via a network,
When the acquisition unit becomes unable to acquire the map data during the scale operation, the display control unit displays the acquired map data after the acquisition unit can acquire the map data. An image display device characterized in that it generates a vector map image of a scale specified by the scale operation and displays the vector map image on a display means. An image display method for displaying an image,
(A) acquiring map data;
(B) generating a vector map image in vector format using the map data, and displaying the vector map image on a display means;
(C) receiving a scale operation for changing the scale of the vector map image displayed on the display means;
(D) a step of generating a raster-format raster map image using the vector map image when the start of the scale operation is accepted, and displaying the raster map image on the display means while the scale operation is continued When,
An image display method comprising: A program executable by a computer included in an image display device for displaying an image,
In the computer,
(A) acquiring map data;
(B) generating a vector map image in vector format using the map data, and displaying the vector map image on a display means;
(C) receiving a scale operation for changing the scale of the vector map image displayed on the display means;
(D) a step of generating a raster-format raster map image using the vector map image when the start of the scale operation is accepted, and displaying the raster map image on the display means while the scale operation is continued When,
A program characterized by having executed.

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