Radio communication system, radio equipment, terminal device, and radio communication method

Abstract

To transmit image data from radio equipment without increasing a price of the radio equipment.SOLUTION: A radio communication system (100) comprises a terminal device (2), radio equipment (1) for performing transmission using a digital communication system, and a memory card (3). The terminal device (2) includes: a creation unit (241) that from single source image data, creates a plurality of pieces of image data whose attributes are different and couples them, and creates a single file so that the pieces of image data are arranged at previously stipulated offset addresses, respectively; and a writing unit (242) for writing the single file (F) into the memory card (3). The radio equipment (1) comprises: a transmission setting unit (81) that from an offset address in the single file (F) including selected image data selected by a user out of the plurality of pieces of image data whose attributes are different, reads the selected image data; and a transmission unit (46) for transmitting the read selected image data.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a wireless communication system having an image transmission function. [Background technology]

[0002] D-STAR (Digital Smart Technologies for Amateur Radio (registered trademark)) is a digital communication method standardized by the Japan Amateur Radio League, a general incorporated association. According to this digital communication method, as disclosed in, for example, Patent Document 1, audio frames and data frames are transmitted in a time-division manner. Patent Document 1 also lists image data obtained by taking a photo with a smartphone as data that can be transmitted by a data frame. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6497112 Summary of the Invention [Problem to be solved by the invention]

[0004] When transmitting image data, the radio must convert the original image data into a predetermined format. Since the radio uses resources such as a CPU, RAM, and ROM for this processing, the radio must secure these resources. Therefore, the radio must be expensive.

[0005] An object of one aspect of the present invention is to transmit image data from a wireless device without increasing the price of the wireless device. [Means for solving the problem]

[0006] In order to solve the above problems, a wireless communication system according to one embodiment of the present invention comprises a terminal device, a radio that transmits data via a digital communication method, and a recording medium provided in the radio and readable by the radio, wherein the terminal device has a creation unit that creates image data for a plurality of images with different attributes from original image data for a single original image, and combines the image data for the plurality of images with different attributes to form a single file in which the image data for the plurality of images with different attributes are each located at a predetermined offset address, and a writing unit that writes the single file to the recording medium, and the radio has a reading unit that identifies the offset address in the single file including selected image data selected by a user from the image data for the plurality of images with different attributes, and reads out the selected image data from the identified offset address, and a transmitting unit that transmits the read selected image data.

[0007] In order to solve the above problems, a radio according to one embodiment of the present invention includes a recording medium on which a single file is written in which image data for a plurality of images with different attributes, created from original image data for a single original image, are combined and positioned at predetermined offset addresses, the recording medium comprising a reading unit that identifies an offset address in the single file containing selected image data selected by a user from the image data for the plurality of images with different attributes and reads out the selected image data from the identified offset address, and a transmitting unit that transmits the read out selected image data via a digital communication method, the recording medium being provided in the radio and readable by the radio.

[0008] In order to solve the above problems, a terminal device according to one embodiment of the present invention includes a creation unit that creates image data for a plurality of images with different attributes from original image data for a single original image, and combines the image data for the plurality of images with different attributes to form a single file in which the image data for the plurality of images with different attributes are each located at a predetermined offset address, and a writing unit that is provided in a radio and writes the single file to a recording medium readable by the radio.

[0009] In order to solve the above problems, a wireless communication method according to one aspect of the present invention includes a creating step in which a terminal device creates image data for a plurality of images having different attributes from original image data for a single original image, and combines the image data for the plurality of images having different attributes to form a single file in which the plurality of image data with different attributes are each located at a predefined offset address; a writing step in which the terminal device writes the single file to a recording medium provided in the radio and readable by the radio; a reading step in which the radio identifies the offset address in the single file including selected image data selected by a user from the image data for the plurality of images with different attributes, and reads the selected image data from the identified offset address; and a transmitting step in which the radio transmits the read selected image data via a digital communication method. Effect of the Invention

[0010] According to one aspect of the present invention, image data can be transmitted from a wireless device without increasing the price of the wireless device. [Brief description of the drawings]

[0011] [Figure 1] 1 is a block diagram showing a configuration of a wireless communication system according to an embodiment of the present invention. [Diagram 2]10 is a diagram showing the structure of a file of image data stored in a memory card in the wireless communication system. FIG. [Diagram 3] A diagram showing the format of data transmitted by a radio device in the above wireless communication system using D-STAR (registered trademark). [Figure 4] 6 is a flowchart showing a procedure of a process in which a terminal device in the wireless communication system creates image data for transmission. [Diagram 5] 6 is a flowchart showing a procedure of a process in which the wireless device transmits transmission image data created by the terminal device. [Figure 6] 11A to 11C are diagrams showing, by way of screens displayed on the radio, a processing procedure in which the radio transmits transmission image data created by the terminal device. [Figure 7] FIG. 13 is a diagram showing a transmission image history screen displayed by the wireless device. [Figure 8] 13 is a diagram showing, by way of a screen displayed on the wireless device, a procedure for creating a reception history when the wireless device receives image data. FIG. [Figure 9] FIG. 13 is a diagram showing a structure for storing received image data in the memory card. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] [Embodiment] Hereinafter, one embodiment of the present invention will be described with reference to FIGS.

[0013] Overview of Wireless Communication System The following describes an overview of the wireless communication system 100. Fig. 1 is a block diagram showing the configuration of a wireless communication system 100 according to an embodiment of the present invention.

[0014] The wireless communication system 100 includes a wireless device 1, a terminal device 2, and a memory card 3. The wireless device 1 has a function of transmitting data by a digital communication method conforming to the above-mentioned D-STAR (registered trademark). The terminal device 2 is a device having an image processing function, such as a smartphone, a tablet, or a personal computer. The memory card 3 has a built-in rewritable non-volatile semiconductor memory such as a flash memory. The memory card 3 is detachably provided in the wireless device 1, and is a recording medium readable by the wireless device 1.

[0015] The terminal device 2 creates image data (transmission image data) for transmission by the wireless device 1 and writes it to the memory card 3. The wireless device 1 transmits the image data stored in the memory card 3, and creates transmission history data as a history of the transmitted image data and writes it to the memory card 3. The wireless device 1 creates reception history data including received image data and related information of the received image data as a history of the received image data (received image data), and writes it to the memory card 3. The terminal device 2 displays an image based on the received image data stored in the memory card 3. Image data for transmission (transmission image data) (Configuration of terminal device) The following describes the configuration of the terminal device 2. Fig. 2 is a diagram showing the configuration of a file of image data stored in the memory card 3 in the wireless communication system 100.

[0016] The terminal device 2 includes an interface unit 21, a display unit 22, a memory 23, and an image processing unit 24.

[0017] The interface unit 21 mediates the exchange of image data between the image processing unit 24 and the memory card 3. The interface unit 21 has a memory controller (not shown) to mediate the exchange of such image data. The interface unit 21 includes a slot (not shown) into which the memory card 3 is detachably inserted.

[0018] The display unit 22 displays various images generated in the terminal device 2. In particular, the display unit 22 displays images read from the memory card 3 by the image processing unit 24.

[0019] The memory 23 stores original image data, which is data about a single original image. The original image data is data that is the basis of image data to be saved in the memory card 3. If the terminal device 2 has a photographing function, the original image data may be data photographed by the photographing function, or may be data obtained from the outside.

[0020] The image processing unit 24 performs a process of creating a plurality of pieces of transmission image data from the original image data and writing the data to the memory card 3, and a process of displaying an image on the display unit 22 based on the image data stored in the memory card 3. To this end, the image processing unit 24 has a creation unit 241, a writing unit 242, and a display processing unit 243.

[0021] The creation unit 241 creates multiple image data with different attributes from the original image data stored in the memory 23, and also creates thumbnail image data from the original image data to be displayed on the display unit 7 of the wireless device 1. The creation unit 241 forms the multiple image data and thumbnail image data as a single file F as shown in FIG.

[0022] Specifically, the creation unit 241 creates nine patterns of transmission image data from the original image data. As shown in Fig. 2, the nine patterns of image data are created for nine types of images each having three image quality (attributes), low image quality, normal image quality, and high image quality, for three image sizes (attributes). The image sizes are 160 x 120 pixels, 320 x 240 pixels, and 640 x 480 pixels. With regard to image quality, for example, the low image quality is 25% of the image quality of the original JPEG image, the normal image quality is 50% of the image quality of the original image, and the high image quality is 75% of the image quality of the original image.

[0023] The creation unit 241 converts the original image data into transmission image data by changing the size according to the three image size patterns and compressing the image data at the three compression rates. This allows the creation unit 241 to create the nine image data patterns described above. The thumbnail images have a small image size of, for example, 128×96 pixels so that they are displayed on small thumbnail screens P1 to P21, which will be described later. For this reason, the creation unit 241 creates thumbnail image data by changing the image size and converting the original image data to monochrome (binarization).

[0024] The creation unit 241 combines the transmission image data and thumbnail image data created as described above to form a single file F as shown in Fig. 2. The single file F is stored in a predetermined storage area in the memory card 3 as a binary file of the image. The creation unit 241 forms the single file F such that the thumbnail image data and image data are respectively located at addresses DAT0HADD to DAT9HADD (offset addresses) from the beginning of the single file F. As a result, the positions of the transmission image data and thumbnail image data for each original image, defined by addresses DAT0HADD to DAT9HADD in the single file F, are the same.

[0025] 2, address DAT0HADD is an address that indicates the start position of thumbnail image data and corresponds to the start address of single file F. Addresses DAT1HADD to DAT9HADD are addresses that indicate the start positions of image data in single file F and are determined based on the start address of single file F.

[0026] Of course, the number of patterns of the transmission image data to be created and the attributes are not limited to the above example. In the following explanation, a group consisting of thumbnail image data and nine patterns of transmission image data is referred to as an "image group."

[0027] The writing unit 242 writes the single file F created by the creating unit 241 into the above-mentioned storage area in the memory card 3.

[0028] Image data is transmitted in blocks of 16x16 pixels. One block is composed of the image size (2 bytes) and actual data (384 bytes), and has a size of 386 bytes. The actual data has a variable size, but in a single file F, the size of one block is fixed at 386 bytes.

[0029] The display processing unit 243 performs processing for displaying on the display unit 22 received image data from a reception processing unit 83 of the wireless device 1, which will be described later, that is the same as the image data transmitted from the transmission source.

[0030] Radio Configuration The following describes the configuration of the wireless device 1. Fig. 3 is a diagram showing a format of data that the wireless device 1 in the wireless communication system 100 transmits using D-STAR (registered trademark).

[0031] The wireless device 1 includes a transmission / reception function unit 4, an antenna 5, an operation unit 6, a display unit 7, and a controller 8.

[0032] The transmission / reception function unit 4 performs processing to transmit voice frames including voice data and data frames including data other than voice data by time division multiplexing in a predetermined format. The transmission / reception function unit 4 performs processing to separate image data and voice data from a received signal according to the above format and output each of them. The transmission / reception function unit 4 has a microphone 41, a speaker 42, an amplifier 43, a voice conversion unit 44, an interface unit 45, a transmission unit 46, a reception unit 47, and a transmission / reception switching unit 48.

[0033] During transmission, the amplifier 43 amplifies the audio signal input from the microphone 41 and outputs it to the audio conversion unit 44. During reception, the amplifier 43 amplifies the audio signal output from the audio conversion unit 44 and outputs it to the speaker .

[0034] During transmission, the voice conversion unit 44 converts the analog voice signal input from the amplifier 43 into digital voice data and compresses the voice data. During reception, the voice conversion unit 44 expands the voice data input from the receiving unit 47 and converts the expanded voice data into an analog voice signal.

[0035] The interface unit 45 mediates data transfer between the memory card 3 and the transmitter 46, and also mediates data transfer between the memory card 3 and the controller 12. The interface unit 45 has a memory controller (not shown) to mediate such data transfer. The interface unit 45 includes a slot (not shown) into which the memory card 3 is detachably inserted.

[0036] The transmitting unit 46 incorporates the voice data from the voice conversion unit 44 into a voice frame, and incorporates the image data from the interface unit 45 into a data frame, and then performs a modulation process on a communication frame including both frames. The transmitting unit 46 performs the above modulation process using a GMSK (Gaussian filtered Minimum Shift Keying) modulation method. The transmitting unit 46 converts the modulated signal into a wireless signal of a frequency (channel) set by the controller 12, amplifies the signal, and outputs the signal to the transmission / reception switching unit 48. By transmitting the above communication frame, the transmitting unit 46 can transmit the voice frame and the data frame including image data using a time division multiplexing method.

[0037] Here, we will explain the structure of one block of image data transmitted by the transmission unit 46. As shown in Fig. 3, one block of image data includes a flag, a source call sign, a destination call sign, an image number assigned at the time of transmission, a checksum, a data body, an additional data body, and a CR.

[0038] The data body includes a mini-header, data, and a checksum. The mini-header includes information indicating the type of data and information about the settings. Here, in the mini-header, "0" is written as the type, indicating an image, and "size" and "image quality" are written as settings, indicating attributes. The data has "horizontal position", "vertical position", and "image data". The blocks are arranged in each of the 40 x 30 areas so that the maximum image size and high-quality image data allow 1200 blocks. The "horizontal position" specifies the positions of the 40 columns. The "vertical position" specifies the positions of the 30 rows. The additional data body is any data that is provided as necessary. The additional data body shown in FIG. 3 includes, as an example, a mini-header, additional data, and a checksum.

[0039] One frame is composed of, for example, three bytes, and the purpose of the data frame is stored in the first byte of the previous frame of two consecutive frames. Therefore, data is sent using the remaining five bytes. Note that the above frame structure is just an example, and the frame structure is of course not limited to this example.

[0040] When the received signal output from the transmission / reception switching unit 48 is included in a specific receiving frequency band set by the controller 12, the receiving unit 47 amplifies the received signal and then performs GMSK demodulation processing to output a communication frame in the above-mentioned format. The receiving unit 47 outputs voice data included in a voice frame in the communication frame to the voice conversion unit 44, and outputs image data included in a data frame in the above-mentioned communication frame to the controller 12.

[0041] During transmission, the transmission / reception switch 48 outputs the transmission signal output from the transmitter 46 to the antenna 5. During reception, the transmission / reception switch 48 outputs the reception signal received by the antenna 5 to the receiver 47.

[0042] The operation unit 6 includes various operating parts such as keys, switches, and dials.

[0043] The display unit 7 displays various types of information in a predetermined format. The display unit 7 is configured with a liquid crystal display device or the like, and has a rectangular display surface. When the wireless device 1 is configured as a portable device, the display surface of the display unit 7 is extremely small. For this reason, the display content of the screen displayed on the display surface is limited.

[0044] The controller 12 performs transmission control and reception control. As transmission control, the controller 12 sets the above-mentioned channel. As reception control, the controller 12 determines whether the received signal was transmitted to the wireless device 1 (own station) based on the header information (ID) in the demodulated communication frame. The controller 12 causes the receiver 47 to process the voice frame and data frame following the header as described above.

[0045] The controller 12 also performs processing for transmitting image data stored in the memory card 3 (image transmission processing) and processing for storing image data included in a received signal (image storage processing). To this end, the controller 12 has a transmission setting unit 81 (acquisition unit, display control unit), a transmission control unit 82 (selection unit, readout unit), and a reception processing unit 83.

[0046] The transmission setting unit 81, in accordance with the user's operation of the operation unit 6, reads out and acquires thumbnail image data for one image group specified by the transmission setting unit 81 from multiple image groups stored in the memory card 3 via the interface unit 45. The transmission setting unit 81 displays the read thumbnail image data on the display unit 7 for the user's reference. The transmission setting unit 81 performs settings for the transmission of one image data item in accordance with the user's operation of the operation unit 6. Specifically, the transmission setting unit 81 sets the image size and image quality input by the user as attributes of the image data to be transmitted.

[0047] The transmission control unit 82 selects, via the interface unit 45, a single file F containing image data (selected image data) designated by the user through operation of the operation unit 6 from among multiple image data in one image group stored in the memory card 3. The transmission control unit 82 also identifies the address of the image data selected in the selected single file F based on the correspondence between image size and image quality and address held by the wireless device 1, and reads out the selected image data from the identified address. The transmission control unit 82 creates transmission history data for the selected image data and writes it to the memory card 3.

[0048] More specifically, for example, when “160×120 / low image quality image data” in FIG. 2 is selected by a user operation, the transmission control unit 82 reads out the image data from address DAT1HADD, which is the offset address at which the selected image data is located, to just before address DAT2HADD, and passes it to the transmission unit 46.

[0049] When multiple image data and thumbnail image data are handled individually, a file is created for each data. In this case, the wireless device 1 needs to set the image size and image quality in order to select one image data to transmit. When only one of the multiple image data is displayed on the terminal device 2 as a representative, the wireless device 1 needs to check whether the multiple image data were created from the same original image, which makes the process complicated. When the user mistakenly deletes one of the multiple image data, consistency between the multiple image data cannot be maintained. Furthermore, when multiple image data are deleted, each file must be deleted individually, which is time-consuming and can easily lead to some image data being left undeleted.

[0050] In contrast to this, in the wireless communication system 100, a plurality of image data and thumbnail image data are used to form an image group, and the image group forms a single file F. This makes it possible to avoid the above-mentioned inconvenience.

[0051] The reception processing unit 83 combines the received image data in blocks from the receiving unit 47, and writes the received image data, which is the same as the image data transmitted from the sender, to the memory card 3. The reception processing unit 83 creates associated information related to the received image data as reception history data, and writes the reception history data to the memory card 3 in association with the image data.

[0052] <Creating image data> The following describes the creation of transmission image data and picture groups by the terminal device 2. Fig. 4 is a flow chart showing the procedure of the process by which the terminal device 2 creates transmission image data and picture groups for transmission.

[0053] 4, first, the creation unit 241 of the terminal device 2 reads and acquires a single original image data that is a candidate for transmission from the memory 23 (step S1). Next, the creation unit 241 creates thumbnail image data and nine patterns of image data based on the acquired original image data (step S2, creation step). The creation unit 241 creates the nine patterns of image data so that the image size and image quality are different from each other as attributes.

[0054] Next, the creation unit 241 combines the image data and thumbnail image data created as described above to form a single file F (step S3). Then, the writing unit 242 of the terminal device 2 writes the single file F formed by the creation unit 241 to the memory card 3 as one image group (step S4, writing step), and ends the process.

[0055] <Transmission of image data> The transmission of image data by the wireless device 1 will be described below. Fig. 5 is a flowchart showing the procedure (wireless communication method) of the process in which the wireless device 1 transmits transmission image data created by the terminal device 2. Fig. 6 is a diagram showing the procedure of the process in which the wireless device 1 transmits transmission image data created by the terminal device 2, using a screen displayed on the wireless device 1. Fig. 7 is a diagram showing a transmission image history screen 204 displayed by the wireless device 1.

[0056] As shown in FIG. 5, first, in the controller 12 of the wireless device 1, the transmission setting unit 81 selects an image to be transmitted by referring to thumbnail images (step S11).

[0057] In order to display thumbnail images, the transmission setting unit 81 first displays an image transmission screen 201 shown in Fig. 6 on the display unit 7. When the user selects a transmission image area 201a on the image transmission screen 201 and operates the enter key of the operation unit 6 while the image transmission screen 201 is displayed, the transmission setting unit 81 displays a transmission image setting screen 202 shown in Fig. 6 on the display unit 7. The names given to the respective images ("Lily Flower" in the example shown in Fig. 6) are displayed in the transmission image area 201a.

[0058] When the user selects the image selection item 202a on the transmission image setting screen 202 and operates the enter key while the transmission image setting screen 202 is displayed, the transmission setting unit 81 reads out the thumbnail image data of "Lily Flower" from the memory card 3. The transmission setting unit 81 causes the display unit 7 to display a thumbnail screen P1 that displays thumbnail images based on the read thumbnail image data.

[0059] The transmission setting unit 81 reads out thumbnail image data for another image group from the memory card 3 in response to the user turning a dial provided on the operation unit 6. By the transmission setting unit 81 reading out the thumbnail image data, the display of the thumbnail screens P1 to P21 can be switched like turning pages.

[0060] When a thumbnail image is displayed and the user operates a key provided on the operation unit 6 to select an image corresponding to the thumbnail image, the transmission setting unit 81 selects the image. The transmission setting unit 81 causes the display unit 7 to display a transmission image setting screen 202 for the selected image, as shown in FIG.

[0061] In this state, the transmission setting unit 81 sets the image size and image quality input by the user (step S12).

[0062] When the user selects image size selection item 202b on transmission image setting screen 202 and presses the enter key, transmission setting unit 81 causes a list of image sizes (not shown) to be displayed on display unit 7. When the user selects a desired image size from the list of image sizes, transmission setting unit 81 sets the image size. When the user selects image quality selection item 202c on transmission image setting screen 202 and presses the enter key, transmission setting unit 81 causes a list of image quality (not shown) to be displayed on display unit 7. When the user selects a desired image quality from the list of image quality, transmission setting unit 81 sets the image quality. When the user separately inputs a call sign of the destination of the image data, transmission setting unit 81 sets the call sign.

[0063] The transmission control unit 82 reads the image data for the selected image from the memory card 3 based on the image size and image quality set by the transmission setting unit 81, and transmits the image data to the transmission unit 46 (step S13, reading step, transmission step). In step S13, the transmission control unit 82 selects an image group (single file F) that includes the image data specified by the user, and reads the image data from the address of the image data selected in the image group.

[0064] When the user performs an operation to open the display of the transmission image setting screen 202 after selecting the image size and image quality and inputting the call sign, the transmission control unit 82 causes the display unit 7 to display the transmission image screen 203 and the transmission menu screen 213 shown in Fig. 6. The transmission image screen 203 includes a thumbnail image corresponding to the image data to be transmitted.

[0065] The transmission menu screen 213 is displayed so as to overlap the transmission image screen 203. The transmission menu screen 213 includes an image transmission item 213a, a transmission image setting item 213b, a transmission image position selection item 213c, and a transmission image history item 213d.

[0066] When the image transmission item 213a is selected by the user, the transmission control unit 82 causes a transmission mode selection screen (not shown) to be displayed on the display unit 7. The transmission mode selection screen has items for the transmission modes "single transmission" and "repeat transmission." "Single transmission" is a transmission mode in which image data is transmitted only once. "Repeat transmission" is a transmission mode in which image data is transmitted repeatedly a predetermined number of times.

[0067] The transmission image setting item 213b is an item for switching the display to the transmission image setting screen 202. The transmission image history item 213d is an item for switching the display to a transmission image history screen 204 (see FIG. 7) described later.

[0068] The transmission image position selection item 213c specifies the position of a block to be transmitted (retransmitted) in image data transmitted in block units in units of multiple rows (row groups) in the above-mentioned 40 columns x 30 rows. This makes it possible to transmit part of the image data by specifying a row group, without the need to transmit all of the image data, when retransmitting a block that was not transmitted correctly in the previous transmission of image data.

[0069] When "single transmission" or "repeat transmission" is selected on the transmission mode selection screen, the transmission control unit 82 displays an image transmission screen 201 on the display unit 7. In this state, when the user operates a PTT switch provided on the operation unit 6 for transmission, the transmission control unit 82 performs image transmission processing. Specifically, the transmission control unit 82 specifies an address corresponding to image data for the selected image and reads the image data from the memory card 3.

[0070] The transmission control unit 82 passes the read image data to the transmission unit 46 via the interface unit 45. The transmission unit 46 then transmits the received image data together with the audio data in a communication frame.

[0071] The transmission control unit 82 creates a transmission history of the transmitted image data as transmission history data, stores it in the memory card 3 (step S14), and ends the process.

[0072] The transmission control unit 82 creates transmission history data by associating the transmitted image data, the thumbnail image data corresponding to the image data, the image number, the image size, the image quality, the call sign of the sender, the call sign of the destination, and the transmission date and time of the image data. Based on the transmission history data created in this manner, the transmission control unit 82 displays a transmitted image history screen 204 as shown in Fig. 7 on the display unit 7. By saving the transmission history data, the settings in the transmission history data can be used to retransmit the transmitted image data without making new settings.

[0073] Receiving image data The following describes the reception of image data by the wireless device 1. Fig. 8 is a diagram showing the procedure for creating a reception history when the wireless device 1 receives image data, using a screen displayed on the wireless device 1. Fig. 9 is a diagram showing the structure for storing received image data in the memory card 3.

[0074] When the receiving unit 47 receives a communication frame including image data, it outputs the image data to the controller 12. The reception processing unit 83 of the controller 12 creates reception history data based on the image data from the receiving unit 47, and stores the received image data in the memory card 3. The reception processing unit 83 creates reception history data for the received image data based on the image size, image quality, call sign of the sender, and reception date and time, and stores the reception history data in the memory card 3.

[0075] When displaying the reception history of received images, first, the reception processing unit 83 causes the display unit 7 to display an image transmission screen 201 shown in Fig. 8. When the user selects a transmission image area 201b on the image transmission screen 201 and operates the enter key of the operation unit 6 while the image transmission screen 201 is displayed, the reception processing unit 83 causes the display unit 7 to display a received image screen 205 shown in Fig. 8. The received image screen 205 is a screen for displaying the history of the most recent received images.

[0076] When the user turns the dial on the operation unit 6 while the received image screen 205 is displayed, the reception processing unit 83 reads out the reception history data stored in the memory card 3 one by one. Then, based on the read reception history data, the reception processing unit 83 displays the received image history screen 206 shown in Fig. 8 on the display unit 7. This makes it possible to switch the display of the received image history screen 206 for each received image in response to the dial operation.

[0077] The reception processing unit 83 deletes the designated reception history in response to a user operation. Specifically, when the user performs an operation to delete the reception history, the reception processing unit 83 displays a deletion designation screen (not shown) for deletion superimposed on the received image screen 205 or the received image history screen 206. When the user designates "delete" from the deletion designation screen, the reception processing unit 83 deletes the reception history data for the displayed received image screen 205 or the received image history screen 206. Also, when the user designates "delete all" from the deletion designation screen, the reception processing unit 83 deletes all reception history data stored in the memory card 3.

[0078] It should be noted that the received image data does not include thumbnail image data, and therefore it is not possible to display a thumbnail image on the display unit 7 as was the case when the image data was transmitted.

[0079] As shown in Fig. 9, the memory card 3 is provided with a number of areas for storing block data for image data of one received image. Each area has a fixed length, and is arranged in X columns and Y rows so that image data (386 bytes) having the maximum image size and high image quality described above can be stored. For example, 1200 areas (40 x 30) are provided.

[0080] The reception processing unit 83 stores the block data from the top area, and fills the empty parts of each area with “0.” Even for images of the same image quality, the larger the difference between pixels in an image, the larger the size of the image data.

[0081] Effects of the embodiment The wireless communication system 100 according to this embodiment includes a wireless device 1, a terminal device 2, and a memory card 3. The memory card 3 is detachably provided in the wireless device 1 and is readable by the wireless device 1.

[0082] The terminal device 2 has a creation unit 421 and a writing unit 242. The creation unit 241 creates image data for a plurality of images with different attributes from original image data for a single original image, and combines the image data to form a single file F. The creation unit 241 forms the single file F such that the image data are each located at an address (offset address) from the beginning of the single file F that is specified in advance. The writing unit 242 writes the single file F to the memory card 3.

[0083] The wireless device 1 has a transmission setting unit 81 and a transmission unit 46. The transmission setting unit 81 specifies an address in the memory card 3 of selected image data selected by a user from among a plurality of image data, and reads the selected image data from the specified address. The transmission unit 46 transmits the read selected image data by a digital communication method.

[0084] In the above configuration, the terminal device 2 creates image data of candidates to be transmitted and writes it to the memory card 3 recording medium. This not only relieves the wireless device 1 from the task of creating image data, but also eliminates the need to secure resources such as RAM and ROM required for converting images. Therefore, when transmitting image data, the wireless device 1 only needs to specialize in the function of selecting and reading one piece of image data stored in the memory card 3 as selected image data and transmitting the selected image data. This allows image data to be transmitted from the wireless device without increasing the price of the wireless device.

[0085] The creation unit 241 creates thumbnail image data from the original image data. The writing unit 242 writes the thumbnail image data to the memory card 3 so that it is included in the file F. The transmission setting unit 81 acquires the thumbnail image data from the memory card 3, and causes the display unit 7 to display a thumbnail image based on the acquired thumbnail image data.

[0086] According to the above configuration, the thumbnail image is displayed on the wireless device 1. This allows the user to check the image of the image data. Moreover, the wireless device 1 does not need resources to create thumbnail image data because it does not create thumbnail image data, although it holds small-sized thumbnail image data for display.

[0087] The creation unit 241 generates image data with the size and image quality of the image as attributes, thereby making it possible to select an image of a desired size and image quality and transmit the image data.

[0088] The memory card 3 can store a plurality of single files F. The transmission control unit 82 selects a single file F including selected image data, as specified by the user, from the plurality of single files F stored in the memory card 3. In this way, the transmission control unit 82 can select the single file F, and then read out from the single file F the transmission image data having the image size and image quality according to the settings.

[0089] [Software implementation example] The functions of the wireless communication system 100 can be realized by a transmission control program for causing a computer to function as the wireless device 1, and an image creation program for causing a computer to function as the terminal device 2. The transmission control program is a program for causing a computer to function as a control block (particularly, the transmission setting unit 81, the transmission control unit 82, and the reception processing unit 83) in the controller 12 of the wireless device 1. The image creation program is a program for causing a computer to function as a control block (particularly, the creation unit 241, the writing unit 242, and the display processing unit 243) in the image processing unit 24 of the terminal device 2.

[0090] In this case, the controller 12 and the image processor 24 each have at least one CPU and one main memory as hardware for executing the transmission control program and the image creation program, respectively. The functions described in the above embodiment are realized by executing the above programs using the CPU and the main memory.

[0091] The transmission control program and the image creation program may each be recorded non-transiently in one or more computer-readable recording media. These recording media may or may not be included in the wireless device 1 and the terminal device 2. In the latter case, the transmission control program and the image creation program may be supplied to the devices via any wired or wireless transmission medium.

[0092] In addition, some or all of the functions of the control blocks of the controller 12 and the image processing unit 24 can be realized by logic circuits. For example, an integrated circuit in which a logic circuit that functions as the above-mentioned control block is formed is also included in the scope of the present invention.

[0093] [Additional Notes] The present invention is not limited to the above-described embodiment, and various modifications are possible within the scope of the claims. In addition, embodiments obtained by appropriately combining the technical means disclosed in the respective embodiments are also included in the technical scope of the present invention. [Explanation of symbols]

[0094] 1 Radio 2 Terminal Equipment 3. Memory card (recording medium) 7 Display section 21 Interface section 46 Transmitter 81 Transmission setting unit (acquisition unit, display control unit) 82 Transmission control unit (selection unit, reading unit) 100 Wireless communication system 241 Creation Department 242 Writing section F Single File DAT1HADD~DAT9HADD Address (Offset Address)

Claims

1. A terminal device; A radio for transmitting data by a digital communication method; a recording medium provided in the radio and readable by the radio, The terminal device a creating unit that creates image data for a plurality of images having different attributes from original image data for a single original image, and combines the image data for the plurality of images having different attributes to form a single file in which the image data for the plurality of images having different attributes are respectively located at predetermined offset addresses; a writing unit that writes the single file onto the recording medium, The radio device includes: a reading unit that identifies the offset address in the single file including selected image data selected by a user from image data for the plurality of images with different attributes, and reads the selected image data from the identified offset address; a transmitting section that transmits the selected image data that has been read out.

2. the creation unit creates thumbnail image data for a thumbnail image of the original image from the original image data; the writing unit writes the thumbnail image data onto the recording medium so as to be included in the single file; The radio device includes: A display unit; an acquisition unit that acquires the thumbnail image data from the recording medium; The wireless communication system according to claim 1 , further comprising: a display control unit that causes the thumbnail image to be displayed on the display unit based on the acquired thumbnail image data.

3. The wireless communication system according to claim 1 , wherein the creating unit creates the image data with a size and an image quality of the image as the attributes.

4. the recording medium is capable of storing a plurality of the single files; 4. The wireless communication system according to claim 1, wherein the wireless device has a selection unit that selects the single file including the selected image data from the plurality of single files stored in the recording medium, in response to a user's designation.

5. a reading unit which, in a recording medium in which a single file has been written in which image data for a plurality of images with different attributes, created from original image data for a single original image, are combined and each image data is formed so as to be located at a predetermined offset address, identifies an offset address in the single file including selected image data selected by a user from the image data for the plurality of images with different attributes, and reads out the selected image data from the identified offset address; a transmitting unit that transmits the selected image data that has been read out by a digital communication method; The recording medium is provided in the radio and is readable by the radio.

6. a creating unit that creates image data for a plurality of images having different attributes from original image data for a single original image, and combines the image data for the plurality of images having different attributes to form a single file in which the image data for the plurality of images having different attributes are respectively located at predetermined offset addresses; a writing unit that is provided in a wireless device and that writes the single file to a recording medium that is readable by the wireless device.

7. a creating step of creating, by a terminal device, image data for a plurality of images having different attributes from original image data for a single original image, and combining the image data for the plurality of images having different attributes so as to form a single file in which the plurality of image data for the different attributes are each located at a predefined offset address; a writing step of writing the single file by the terminal device onto a recording medium provided in a radio device and readable by the radio device; a reading step of identifying, by the wireless device, the offset address in the single file including selected image data selected by a user from image data for the plurality of images having different attributes, and reading the selected image data from the identified offset address; a transmitting step of transmitting the read selected image data by the wireless device using a digital communication method.

Images