JP2011242700A - Display control unit, display control program and display control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display control unit, a display control program and a display control method, capable of preventing increase of data processing amount in image processing, and preventing transmission of a non-transmission area at the same time.SOLUTION: A display control unit 190 comprises a data acquisition part 191 for acquiring image data representing a partial image which is a part of a foreground image. The display control unit 190 also comprises an image synthesizing part 194 having a data selection part for selecting data which are represented by the acquired image data and are different from pixel data representing pixel colors of the partial image, as transmission color data which define colors of a transmission area possessed by the foreground image. Furthermore, the display control unit 190 comprises a display control part 195 which controls a display part so that it displays a synthesized image in which a corresponding region of a background image corresponding to the transmission area of the foreground image represented by transmission colors defined by the selected transmission color data is synthesized.

Description

  The present invention relates to a display control device, a display control program, and a display control method.

  In Patent Document 1, in order to reduce the amount of data processing in image processing, a predetermined color is defined as a transparent color, and a region of the background image corresponding to the defined transparent color region is combined with the defined transparent color region. A technique (hereinafter referred to as transmitting a region) is disclosed.

JP 2007-243512 A

  Here, in the technique disclosed in Patent Document 1, for example, when a foreground image F0 as shown in FIG. 12A and a background image B as shown in FIG. If the color of the partial image (hereinafter referred to as non-transparent area) MP and MS happens to coincide with the transparent color, a part of the background image B in the composite image C0 as shown in FIG. There has been a problem of transmitting through MP and MS.

  Therefore, in view of the above, the present invention has an object of a display control apparatus, a display control program, and a display control apparatus capable of preventing transmission of a non-transparent area while preventing an increase in data processing amount in image processing. It is to provide a display control method.

In order to achieve the above object, a display control apparatus according to the first aspect of the present invention provides:
Data acquisition means for acquiring image data representing a partial image that is a part of the foreground image;
Data selection means for selecting data different from the pixel data representing the pixel color of the partial image, which is represented by the image data obtained by the data obtaining means, as transparent color data for determining the color of the transparent area of the foreground image When,
A synthesized image obtained by synthesizing the corresponding area of the background image corresponding to the transparent area with respect to the transparent area of the foreground image represented by the transparent color determined by the transparent color data selected by the data selection means is displayed. Display control means for controlling the display unit,
It is characterized by that.

In the display control device according to the first aspect,
The data acquisition means further acquires default transmission color data,
Further comprising data conversion means for converting the default transparent color data acquired by the data acquisition means into data different from any of the pixel data;
The data selection means selects the default transmission color data converted by the data conversion means as transmission color data that determines the color of the transmission area.
It is also good.

In the display control device according to the first aspect,
The data conversion means converts a bit value stored at a predetermined position of the pixel data constituting the image data acquired by the data acquisition means into a predetermined value, and transmits the default transmission acquired by the data acquisition means. Converting the bit value stored in the predetermined position of the color data into a value different from the predetermined value;
It is also good.

Furthermore, in the display control device according to the first aspect,
The data conversion unit increases or decreases the number of bits of pixel data constituting the image data acquired by the data acquisition unit,
The predetermined position of the pixel data is a position different from the position where the bit value of the pixel data before conversion is stored.
It is also good.

In the display control device according to the first aspect,
The predetermined position of the pixel data is a position on the lower side of the center position among all positions.
It is also good.

In order to achieve the above object, a display control program according to the second aspect of the present invention provides:
Computer
Data acquisition means for acquiring image data representing a partial image that is a part of the foreground image;
Data selection means for selecting data different from the pixel data representing the pixel color of the partial image, which is represented by the image data obtained by the data obtaining means, as transparent color data for determining the color of the transparent area of the foreground image When,
A synthesized image obtained by synthesizing the corresponding area of the background image corresponding to the transparent area with respect to the transparent area of the foreground image represented by the transparent color determined by the transparent color data selected by the data selection means is displayed. Function as display control means for controlling the display unit,
It is characterized by that.

In order to achieve the above object, a display control method according to the third aspect of the present invention includes:
A data acquisition step of acquiring image data representing a partial image that is a part of the foreground image;
A data selection step of selecting data different from pixel data representing the pixel color of the partial image, which is represented by the image data acquired in the data acquisition step, as transmission color data for determining the color of the transmission region of the foreground image When,
A synthesized image obtained by synthesizing the corresponding area of the background image corresponding to the transparent area with respect to the transparent area of the foreground image represented by the transparent color determined by the transparent color data selected in the data selection step is displayed. A display control step for controlling the display unit.
It is characterized by that.

  According to the display control device, the display control program, and the display control method according to the present invention, it is possible to prevent the transmission of the non-transparent area while preventing an increase in the data processing amount in the image processing.

FIG. 1A is a diagram illustrating an example of a mobile communication terminal equipped with the display control apparatus according to the first embodiment of the present invention. FIG. 1B is a diagram illustrating an example of a hardware configuration of a mobile communication terminal equipped with the display control apparatus according to the first embodiment. FIG. 2A is a diagram illustrating an example of a moving image. FIG. 2B is a diagram illustrating an example of a pictogram image. FIG. 2C illustrates an example of a composite image. FIG. 3A is a flowchart illustrating an example of data transfer processing executed by the CPU in the first embodiment. FIG. 3B is a flowchart illustrating an example of data conversion processing executed by the data conversion unit in the first embodiment. 2 is a diagram illustrating an example of a hardware configuration of a display control apparatus according to Embodiment 1. FIG. FIG. 5 is a functional block diagram illustrating an example of functions of the display control apparatus. FIG. 6A is a diagram illustrating an example of data before and after data conversion in the first embodiment. FIG. 6B is a diagram illustrating a data example before and after data conversion in the modification of the first embodiment. FIG. 7A is a diagram illustrating an example of a transparent color foreground image. FIG. 7B is a diagram illustrating an example of the foreground image overwritten with the pictographic image. FIG. 7C is a diagram illustrating an example of a combined image obtained by combining the foreground image and the background image. FIG. 8A is a flowchart illustrating an example of image composition processing executed by the image composition unit. FIG. 8B is a diagram illustrating a configuration example of the image composition unit. FIG. 9A is a diagram illustrating an example of a hardware configuration of a mobile communication terminal equipped with the display control apparatus according to the second embodiment. FIG. 9B is a functional block diagram illustrating an example of functions realized by the CPU executing software processing. FIG. 10A is a flowchart illustrating an example of data transfer processing executed by the CPU in the second embodiment. FIG. 10B is a flowchart illustrating an example of data conversion processing executed by the data conversion unit in the second embodiment. It is a flowchart showing an example of the transparent color data selection process which CPU performs. FIG. 12A is a diagram illustrating an example of a conventional foreground image. FIG. 12B is a diagram illustrating an example of a conventional background image. FIG. 12C is a diagram illustrating an example of a conventional composite image.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the accompanying drawings.

(Embodiment 1)
A display control apparatus 190 according to the first embodiment of the present invention is mounted on a mobile communication terminal 100 as shown in FIG. 1A, and is an LCD (Liquid Crystal Display) 101 constituting a display unit included in the mobile communication terminal 100. Control the display. Specifically, the display control device 190 superimposes a pictographic image P as shown in FIG. 2B on a moving image M representing a state where the train TR as shown in FIG. The LCD 101 is controlled so as to display a composite image C as shown in FIG.

  The pictogram image P includes a control image used for reproduction control of the moving image M and a state image representing the state of the mobile communication terminal 100. The control image includes an image BTP representing a play button and an image BTS representing a stop button as shown in FIG. 2B, and the state image is an image AT representing the intensity of radio waves received by the mobile communication terminal 100. , An image BT representing the storage amount of the battery included in the mobile communication terminal 100, and an image CL representing the system time of the mobile communication terminal 100.

  As shown in FIG. 1A, the mobile communication terminal 100 includes a speaker 102 that outputs a received voice, a microphone (hereinafter simply referred to as a microphone) 103 that inputs a call voice, and an operation that inputs signals according to various operations. With key 104.

  Further, as shown in FIG. 1B, the mobile communication terminal 100 includes a CPU (Central Processing Unit) 105, a RAM (Random Access Memory) 106, a ROM (Read Only Memory) 107, a media controller connected to each other via a bus. 108, a signal processing unit 109, and an antenna 110. The speaker 102, the microphone 103, the operation key 104, and the display control device 190 that controls the display of the LCD 101 described with reference to FIG. 1A are also connected to the bus.

Before describing the CPU 105, the RAM 106, the ROM 107, the media controller 108, the signal processing unit 109, and the antenna 110 will be described.
The RAM 106 temporarily stores data used by the CPU 105 for executing software processing. The ROM 107 stores a program executed by the CPU 105 and image data representing various images displayed on the LCD 101. The media controller 108 acquires various image data and programs from the recording medium. Note that the recording medium includes a flash memory, a CD (Compact Disc), a DVD (Digital Versatile Disc), and a Blu-ray Disc (Blu-ray Disc). The signal processing unit 109 modulates and demodulates a high-frequency signal transmitted and received by the antenna 110 in order to perform wireless communication of call voice and received voice.

  The CPU 105 performs overall control of the mobile communication terminal 100 by executing software processing in accordance with a program stored in the ROM 107. The software process executed by the CPU 105 includes a data transfer process as shown in FIG. 3A in which the pictogram image P and the moving image M are transferred to the display control device 190.

  When the CPU 105 starts executing the data transfer process of FIG. 3A, the CPU 105 acquires transmission color data representing a preset (that is, default) transmission color from the ROM 107 of FIG. 1B (step S01). . Next, the CPU 105 outputs the acquired transmission color data to the display control device 190 (step S02).

  Note that the transparent color refers to a predetermined color that represents a region through which the foreground image is transmitted (hereinafter simply referred to as a transparent region) when the foreground image is synthesized on the background image. In addition, when an image having a certain region is used as a foreground image, the region is transmitted by combining the region in the position corresponding to the region of the background image (hereinafter simply referred to as the corresponding region) with the region of the foreground image. To do (apply, replace).

  After executing step S02, the CPU 105 acquires pictographic data representing the pictographic image P in FIG. 2B from the ROM 107 (step S03). Next, the CPU 105 outputs the acquired pictogram data to the display control device 190 (step S04).

  Note that the colors of the image area MP representing the play button mark displayed on the image BTP included in the pictogram P of FIG. 2B and the image area MS representing the stop button mark displayed on the image BTS are: Assume that the transmission color represented by the transmission color data acquired in step S01 coincides with the transmission color here. However, the image areas MP and MS are image areas that constitute the pictogram image P, and are non-transparent areas that are not areas through which the background image is transmitted. There is a case where they coincide with each other because it is difficult for the developer to confirm that none of the pixel colors used in the pictogram image P (hereinafter simply referred to as pixel colors) matches the transmitted color. It is. In addition, when the pictogram image P is changed to an image downloaded by the user, it is very difficult for the user to determine whether or not the pictogram image after the change includes a transparent color.

  Thereafter, the CPU 105 refers to the header of the moving image data representing the moving image M recorded on the medium (that is, the medium) via the media controller 108. Next, the CPU 105 determines that there is a frame for which the following steps S06 and S07 have not been performed (that is, an unprocessed frame) based on the contents of the referenced header (step S05; Yes). Next, the CPU 105 acquires frame data representing the next unprocessed frame from the medium (step S06). Next, the CPU 105 outputs the acquired frame data to the display control device 190 (step S07).

  Thereafter, the CPU 105 returns to step S05 and repeats the above processing until there is no unprocessed frame data. Next, when determining that there is no unprocessed frame data (step S05; No), the CPU 105 ends the execution of the data transfer process.

  The display control device 190 to which data is transferred from the CPU 105 by executing the data transfer processing includes a power regulator 190a, a DC-DC converter 190b, a backlight inverter (hereinafter simply referred to as an inverter) 190c, and CPLD (see FIG. 4). Complex Programmable Logic Device) 190d, SRAM (Static RAM) 190e, bus buffer 190f, and the like.

  The power regulator 190a outputs a predetermined amount of current at a predetermined voltage to the CPLD 190d, the DC-DC converter 190b outputs a direct current of the predetermined voltage to the LCD 101, and the backlight inverter 190c exchanges the backlight with the LCD 101. Output current.

  The CPLD 190d is composed of an LSI (Large Scale Integration), and in cooperation with the SRAM 190e and the bus buffer 190f, a data acquisition unit 191, a data conversion unit 192, an LCD controller memory (hereinafter simply referred to as an LCDC memory) as shown in FIG. ), 193, an image composition unit 194, and a display control unit 195.

  The data acquisition unit 191 acquires transparent color data, pictogram data, and frame data transferred from the CPU 105. Here, it is assumed that the data transferred from the CPU 105 to the data acquisition unit 191 is transferred using a 6-bit data bus 190g as shown in FIG. Therefore, in order to represent the color of one pixel as these transferred data, as shown on the left side of the data conversion unit 192 in FIG. 6A, red (Red), green (Green), and blue ( Blue) 3 6-bit data is used.

  On the other hand, the bus used for transferring data from the display control unit 195 to the LCD 101 is an 8-bit data bus 190h as shown in FIG. Therefore, in order to represent the color of one pixel as the data output from the display control unit 195, three 8 colors of red, green, and blue as shown on the right side of the data conversion unit 192 in FIG. Bit data is used.

For this reason, the data conversion unit 192 of FIG. 5 executes a data conversion process for converting the bit size of data as shown in FIG.
When the execution of the data conversion process of FIG. 3B is started, the data conversion unit 192 transmits the color data before conversion (that is, default) transmitted from the data acquisition unit 191 in step S02 of FIG. Is acquired (step S11).

  Next, the data conversion unit 192 converts the number of bits of the acquired transparent color data. Specifically, as shown in the upper right of FIG. 6A, the bit values from the most significant bit to the least significant bit of the transmitted 6-bit (that is, before conversion) transmitted color data are transferred to the LCD 101. 8 bits (that is, after conversion) of transparent color data are stored from the most significant bit to the third most significant bit. Next, the data conversion unit 192 stores the bit value “1” in the second-order bit and the first-order (that is, least significant) bit of the pixel data (step S12).

  The 6-bit transmission color data is originally composed of a high-order 6-bit bit string of data representing the transmission color with 8 bits. For this reason, the transmission color represented by the transmission color data before the conversion in step S12 and the transmission color represented by the transmission color data after the conversion differ only in 3 gradations out of 256 gradations.

  Thereafter, the data conversion unit 192 writes the converted transmission color data to the entire pictogram area of the LCDC memory 193 shown in FIG. 5 (step S13). The pictogram area is a memory area in which pictogram data representing the pictogram image P in FIG. 2B is written. That is, in step S13, as shown in FIG. 7A, the data conversion unit 192 saves the image data representing the foreground image F1 in which the entire area is the converted transmission color in the pictogram area.

  Thereafter, the data conversion unit 192 acquires the pictogram data transferred in step S04 of FIG. 3A from the data acquisition unit 191 (step S14). Next, the data conversion unit 192 converts the number of bits of the pictographic data. Specifically, as shown in the lower right of FIG. 6A, the bit values from the most significant bit to the least significant bit of the pixel data constituting the transferred 6-bit (that is, before conversion) pictogram data are represented. The 8-bit (ie, after conversion) pictogram data transferred to the LCD 101 is stored from the most significant bit to the third most significant bit of the pixel data. Next, the data conversion unit 192 stores the bit value “0” in the second and first bits of the pixel data (step S15). This happens that the image areas MP and MS of the pictogram image represented by the same color as the transmission color before conversion (that is, the non-transmission area in FIG. 2B) and the transmission area represented by the transmission color. This is for distinguishing (making the colors of the regions different). Similar to the transparent color data, the 6-bit pixel data constituting the pictographic data is originally composed of the upper 6-bit bit value of the data representing the pixel color with 8 bits.

  Next, the data converter 192 partially overwrites the pictogram area after the pictogram data after the conversion (step S16). That is, in step S16, the data conversion unit 192 converts the image AT, the image BT, the image CL, the image BTP, and the image BTS included in the pictogram image P in FIG. 2B into the foreground image F1 in FIG. Are overwritten at respective predetermined positions. Thereby, the data conversion unit 192 converts the data stored in the pictogram area into image data representing the foreground image F2 as shown in FIG. 7B. Therefore, unlike FIG. 12A, the colors of the transmission area TA and the colors of the areas MP and MS that constitute the foreground image F2 of FIG. 7B are different from each other by the conversion processing in steps S12 and S15. It has been converted to.

  After executing the processing of step S16 in FIG. 3B, the data conversion unit 192 determines that the CPU 105 transfers frame data based on, for example, a control signal output from the CPU 105 (step S17; Yes). ). Next, the data conversion unit 192 acquires the frame data transferred in step S07 of FIG. 3A from the data acquisition unit 191 (step S18).

  Next, the data conversion unit 192 converts the number of bits of the frame data. Specifically, as shown in the lower right of FIG. 6A, the bit values from the most significant bit to the least significant bit of the transferred 6-bit (that is, before conversion) frame data are transferred to the LCD 101. 8 bits (that is, after conversion) of the frame data from the most significant bit to the third most significant bit. Next, the data conversion unit 192 stores the bit value “0” in the second most significant bit and the least significant bit of the frame data. Similar to the pictographic data, the 6-bit pixel data constituting the frame data is originally composed of the upper 6-bit bit value of the data representing the pixel color with 8 bits.

  Thereafter, the data conversion unit 192 sets the size of the frame represented by the converted frame data (that is, the number of pixels in the scanning direction (horizontal direction) and the number of pixels in the sub-scanning direction (vertical direction)) in the pictogram area. After converting to the same size as the size of the foreground image F2 represented by the stored image data, the converted frame data is written in the image area of the LCDC memory 193 shown in FIG. 5 (step S19). The image area is a memory area in which image data representing a background image of an image represented by image data written in the pictogram area is written.

  Thereafter, the data conversion unit 192 returns to step S17 and repeats the above processing until the transfer of the frame data from the CPU 105 is completed. Next, when the data conversion unit 192 determines that the CPU 105 does not transfer the frame data (step S17; No), the data conversion processing ends.

  When the image data representing the foreground image F2 and the frame data representing the frame of the moving image M are written into the LCDC memory 193 in FIG. 5 by executing the data conversion process, the image composition unit 194 in FIG. An image composition process as shown in FIG. 8A is performed in which the foreground image F2 and the background image B are synthesized after the frame represented by the frame data is set as the background image B. The image composition unit 194 includes a data selection unit 194a and a data composition unit 194b as shown in FIG.

  When the execution of the image composition processing of FIG. 8A is started, the data selection unit 194a of the image composition unit 194 shown in FIG. 8B, for example, is a transparent after conversion set in a register included in the display control device 190. Color data is acquired, and the acquired converted transmission color data is selected as transmission color data for determining the color of the transmission area represented by the image data stored in the picto area (step S21). Next, the data synthesizing unit 194b of the image synthesizing unit 194 performs the following step S23 on all the pixel data representing the pixel color of the foreground image F2 among the pixel data constituting the image data stored in the picto region. It is determined that it is not the target of the process of S26 (Step S22; No).

  Next, the data synthesizing unit 194b selects one of the unprocessed pixel data as selected pixel data (step S23). Next, the data composition unit 194b represents the color of the pixel of the foreground image F2 represented by the selected pixel data (hereinafter simply referred to as the selected pixel) by the selected (that is, converted) transmitted color data. It is determined whether the color is a transparent color (step S24).

  In step S24, when the color of the selected pixel matches the converted transmission color (step S24; Yes), the data composition unit 194b includes the pixel data constituting the frame data stored in the image area. Pixel data representing the pixel of the background image B at the position corresponding to the position of the selected pixel of the foreground image F2 (hereinafter referred to as corresponding pixel data) is output to the display control unit 195 in FIG. 5 (step S25).

  In step S24, when the color of the selected pixel does not match the converted transmission color (step S24; No), the data composition unit 194b outputs the selected pixel data of the foreground image F2 to the display control unit 195 (step S24). S26).

  After executing step S25 or S26, the data composition unit 194b returns to step S22 and repeats the above processing. Thereafter, when the data compositing unit 194b determines that all the pixel data of the foreground image F2 is to be processed in steps S23 to S26 (step S22; Yes), the execution of the image compositing process is terminated.

  The display control unit 195 in FIG. 5 outputs an image signal to the LCD 101 according to the pixel data output from the image composition unit 194. As a result, the display control unit 195 controls the LCD 101 to display a composite image C that does not transmit the non-transparent areas MP and MS, as shown in FIG.

  According to these configurations, the display control apparatus 190 transmits data different from the data representing the colors of the partial images (that is, the non-transparent areas) MP and MS constituting the foreground image F2 in FIG. Therefore, it is possible to prevent the composite image C0 in which the background image has been transmitted through the non-transparent areas MP and MS, as shown in FIG. 12C, from being displayed on the LCD 101.

  Further, according to these configurations, the display control apparatus 190 generates default transmission color data that defines the same color as the color of the non-transmission areas MP and MS in FIG. Converts data that is different from the color to transparent data. For this reason, even when the colors of the non-transparent areas MP and MS before the conversion match the transmission colors before the conversion, the non-transparent areas MP and MS as shown in FIG. The image C can be displayed on the LCD 101 in FIG.

  Further, according to these configurations, the display control device 190 determines whether the pixel data representing the pixel color of the foreground image F2 in FIG. 7B matches the converted transmission color data. Since it is determined whether or not the pixel data is transmitted, it is possible to prevent an increase in the data amount, the data processing amount, and the processing execution speed that are targets of the image composition processing in FIG.

  Furthermore, according to these configurations, the display control device 190 sets the bit value stored in the first bit and the bit value stored in the second bit of the 8-bit transparent color data as values. The bit value stored in the first bit of the 8-bit pictogram data and the bit value stored in the second bit are each changed to the value “0”. In addition, transmission of the pictographic image P can be prevented.

  Further, according to these configurations, the display control device 190 is different from the positions (that is, the third to sixth positions) in which the bit values of the transmission color data before conversion are stored (that is, the third position to the sixth position). The bit value of the converted transparent color data stored in the 2nd bit is converted. For this reason, the display control apparatus 190 can limit the change in the transmitted color caused by the data conversion process of FIG. 3B to a maximum of 3 gradations out of 256 gradations.

  In the present embodiment, the data conversion unit 192 sets the first-order bit value and the second-order bit value of the converted transparent color data to the value “1”, and pixel data constituting the converted pict data In the above description, the first-order bit value and the second-order bit value are set to the value “0”. However, the data conversion unit 192 sets the first-order bit value and the second-order bit value of the converted transparent color data to the value “0”, and sets the first-order pixel data constituting the converted pict data. The bit value and the second-order bit value may be the value “1”.

  Also with this configuration, the display control device 190 can limit the color change of the pixels constituting the pictogram image P generated by the data conversion process of FIG. 3B to a maximum of 3 gradations out of 256 gradations.

In the present embodiment, the data conversion unit 192 sets only the first bit value of the converted transparent color data to “1” and sets the first bit value of the pixel data constituting the converted pict data. Only the value “0” may be used. According to this configuration, the display control device 190 converts the least significant bit value, so that the color change caused by the data conversion process can be reduced most.
Alternatively, the first bit value and the second bit value may be set to “1”, “0”, “0”, “1”, and the like, respectively. (In short, it is sufficient that the converted transmitted color data does not match the converted pictogram data.)

  The mobile communication terminal 100 on which the display control device 190 is mounted is a mobile phone, but is not limited to this. The portable communication terminal 100 may be, for example, a PHS (Personal Handy-phone System), a notebook computer, a music player, an electronic book terminal, and a portable game machine. The mobile communication terminal may include a PDP (Plasma Display Panel) display or an EL (Electroluminescence) display instead of the LCD 101, and the display control device 190 may control the display of these displays.

  In the present embodiment, the data conversion unit 192 performs steps S12 and S15 in FIG. 3B from the most significant bit to the fourth most significant bit of the transferred 8-bit data as shown in FIG. 6A. The bit value is described as being stored without changing the value from the most significant bit of the 6-bit data transferred to the display control device 190 to the second most significant bit. However, the present invention is not limited to this, and the data conversion unit 192 is, for example, a value obtained by changing a numerical value represented by a bit string from the most significant bit to the fourth bit of the transferred 8-bit data by a predetermined value. A bit string representing (that is, a value increased or decreased by a predetermined value) may be stored from the most significant bit of the 6-bit data transferred to the display control device 190 to the second most significant bit. That is, the bit string from the most significant bit to the fourth most significant bit in the 8-bit data before conversion and the bit string from the most significant bit to the second most significant bit in the converted 6-bit data must completely match. There is no.

(Modification)
Next, a modification of this embodiment will be described.
The display control apparatus 190 according to the modification example acquires data from the CPU 105 using an 8-bit data bus and outputs data to the LCD 101 using a 6-bit data bus.

  Therefore, the transmission color data, pictogram data, and frame data transferred from the CPU 105 to the display control device 190 are as shown on the left side of the data conversion unit 192 in FIG. 6B in order to represent the color of one pixel. Three 8-bit data of red, green and blue are used. On the other hand, in order to represent the color of one pixel, the data output from the display control device 190 has three 6 bits of red, green, and blue as shown on the right side of the data conversion unit 192 in FIG. Data is used.

  Here, the data conversion unit 192 in the modified example performs the transfer of transmitted 8-bit (that is, before conversion) transmitted color data in step S12 of FIG. 3B, as shown in the upper right of FIG. 6B. Bit values from the most significant bit to the fourth most significant bit are stored from the most significant bit to the second most significant bit of 6-bit (that is, converted) transparent color data transferred to the display control device 190, respectively. Next, the data conversion unit 192 stores the bit value “1” in the least significant bit of the pixel data. This is because the display control device 190 sets the color represented by the upper 6-bit data used in the 8-bit transmission color data as the transmission color.

  In addition, in step S15 of FIG. 3B, the data conversion unit 192, as shown in the lower right of FIG. 6B, pixel data constituting the transferred 8-bit (that is, before conversion) pictographic data. The bit values from the most significant bit to the fourth most significant bit are stored from the most significant bit to the second most significant bit of the pixel data constituting the 6-bit (ie, converted) pictogram data transferred to the LCD 101, respectively. . This is because the LCD 101 displays the color represented by the upper 6-bit data used in the 8-bit pictogram data on the pixels.

  Next, the data conversion unit 192 stores the bit value “0” in the first bit of the pixel data. This happens because the image areas MP and MS of the pictogram image P represented by the same color as the transmissive color before the conversion are distinguished from the transmissive area (the colors of the areas are different). Similar to the transparent color data, the 6-bit pixel data constituting the pictographic data is originally composed of the upper 6-bit bit value of the data representing the pixel color with 8 bits.

  According to these configurations, even when data conversion for reducing the number of bits is performed, as shown in FIG. 12C, an increase in the data processing amount in the image composition processing in FIG. It is possible to prevent the background image from being transmitted through the non-transmissive areas MP and MS, and a desired display as shown in FIG.

  In addition, according to these configurations, only the lowest bit value is changed, so that the change in the pixel color of the pictogram image P caused by the modification of the data conversion process is limited to a maximum of 1 gradation out of 64 gradations. it can.

  In the present embodiment and the modification of the present embodiment, the number of bits of data such as transmission color data and pictographic data acquired by the display control device 190 from the CPU 105, and the bits of converted data output by the display control device 190 to the LCD 101. It was explained that the number was different. However, the present invention is not limited to this. For example, data such as transmission color data and pictographic data acquired by the display control device 190 from the CPU 105 and converted data output from the display control device 190 to the LCD 101 are both 8. It may be bit data. That is, for example, as long as data conversion is performed so that the predetermined bit value of the transmission color data is different from the predetermined bit value of the pictographic data, the number of bits of the converted transmission color data and the converted bit value are converted. The number of bits of pictographic data may be the same.

(Embodiment 2)
Next, Embodiment 2 will be described.
The display control apparatus 290 according to the second embodiment of the present invention is mounted on the mobile communication terminal 200, as in the first embodiment, and as shown in FIG. 290d). The CPU 290a executes data transfer processing as shown in FIG. 10A, in which data different from any of the pixel data constituting the pictographic data is selected as transparent color data, and then the selected transparent color data is transferred to the LCDC 290d. To do. The CPU 290a functions as a data acquisition unit 291, a data selection unit 292, and a data output unit 293 as illustrated in FIG. 9B by executing this data transfer process. In addition, in this embodiment, the description about the structure common to Embodiment 1 is abbreviate | omitted.

  When the execution of the data transfer process shown in FIG. 10A is started, the data acquisition unit 291 acquires pictographic data from the ROM 290c of FIG. 9A (step S31). Next, the data selection unit 292 executes transmission color data selection processing as shown in FIG. 11 in which data different from any of the pixel data constituting the pictographic data is selected as transmission color data (step S32).

  When the execution of the transparent color data selection process shown in FIG. 11 is started, the data selection unit 292 makes a plurality of predetermined colors for a list storing transparent color candidates (hereinafter simply referred to as a transparent color list). By storing the colors, the transparent color list is initialized (step S51).

  Next, the data selection unit 292 determines that not all of the pixel data constituting the pictogram data acquired in step S31 of FIG. 10A is the target of the following steps S53 to S55. (Step S52; No).

  Next, the data selection unit 292 selects one of the unprocessed pixel data as selected pixel data (step S53). Next, the data selection unit 292 determines whether or not the color of the pixel (hereinafter simply referred to as the selected pixel) of the pictogram image P in FIG. 2B represented by the selected pixel data is stored in the transparent color list. Judgment is made (step S54).

  If it is determined in step S54 that the color of the selected pixel is stored in the transparent color list (step S54; Yes), the data selection unit 292 deletes the color of the selected pixel from the transparent color list (step S55).

  When it is determined in step S54 that the color of the selected pixel is not stored in the transparent color list (step S54; No), and after executing step S55, the data selection unit 292 returns to step S52 and performs the above processing. Repeat until there is no unprocessed pixel data.

  Next, when the data selection unit 292 determines that all the pixel data of the pictographic data has been processed (step S52; Yes), one of the transparent color candidates stored in the transparent color list is selected as the color of the transparent area. Is selected as a transmission color (step S56). Thereafter, the data selection unit 292 converts the default transmission color data that has already been set into transmission color data representing the selected transmission color (hereinafter, referred to as a selection transmission color) (step S57). Thereafter, the data selection unit 292 ends the execution of the transparent color data selection process. If the default transparent color data is not set, the data selection unit 292 only needs to set the data representing the selected transparent color selected in step S56 as the default transparent color data. There is no need to execute processing.

  When the execution of step S32 shown in FIG. 10A is completed, the data output unit 293 of FIG. 9B outputs the converted transmission color data to the LCDC 290d (step S33). Next, the data output unit 293 outputs the pictogram data acquired in step S31 to the LCDC 290d (step S34).

  Next, the data acquisition unit 291 determines that there is unprocessed frame data as in step S05 of FIG. 3 (step S35; Yes). Next, the data acquisition unit 291 acquires the next unprocessed frame data from the media via the media controller 209 of FIG. 9A (step S36). Next, the data output unit 293 outputs the acquired frame data to the LCDC 290d (step S37).

  Thereafter, the data acquisition unit 291 returns to step S35 and repeats the above processing until there is no unprocessed frame data. Next, when determining that there is no unprocessed frame data (step S35; No), the data acquisition unit 291 ends the execution of the data transfer process.

The LCDC 290d to which data is transferred from the CPU 290a executes a data conversion process as shown in FIG.
When the execution of the data conversion process is started, the LCDC 290d obtains the transmission color data transmitted in step S33 of FIG. 10A (step S41), and then converts the number of bits of the transmission color data (step S42). ). Unlike step S12 in FIG. 3B described in the first embodiment, the LCDC 290d does not change the second-order bit value and the first-order bit value of the transmission color data.

  Next, the LCDC 290d writes the converted transmission color data to the pictogram region (step S43), and then acquires the pre-conversion pictogram data output in step S34 of FIG. 10A (step S44). Next, the LCDC 290d converts the number of bits of the pixel data constituting the pictogram data (step S45). Note that, unlike step S15 of FIG. 3B described in the first embodiment, the LCDC 290d does not change the second bit value and the first bit value of the pixel data.

  Next, the LCDC 290d partially overwrites the pictogram area with the pictogram data after the conversion (step S46). After that, the LCDC 290d determines that the CPU 290a transfers frame data (step S47; Yes), similarly to step S17 in FIG. 3B.

  Thereafter, the LCDC 290d obtains the frame data transmitted in step S37 of FIG. 10A (step S48), and then converts the number of bits of the pixel data constituting the frame data (step S49). Unlike the first embodiment, the LCDC 290d does not change the second-order bit value and the first-order bit value of the pixel data.

  Next, the LCDC 290d writes the converted frame data into the image area (step S50). Thereafter, the LCDC 290d returns to step S47 and repeats the above processing until the transfer of frame data by the CPU 290a is completed.

  Thereafter, when the LCD 290d determines that the CPU 290a does not transfer frame data (step S47; No), the execution of the data conversion process is terminated.

  According to these configurations, since data representing a color that is not used for the pixel color of the pictogram image P in FIG. 2B is selected as the transmission color data, the color of the non-transmission area matches the transmission color. It is possible to prevent the composite image C0 in which the background image has been transmitted through the non-transparent areas MP and MS as shown in FIG. 12C from being displayed on the LCD 201.

  According to these configurations, the display control device 290 converts the transmission color data into data representing a color that is not used as the pixel color of the pictogram image P. Therefore, the color of the non-transmission area before the conversion is the transmission before the conversion. Even in the case of matching with the color, an image that does not transmit the non-transmissive region can be displayed on the LCD 201.

  Further, according to these configurations, the display control device 290 does not change the first bit value and the second bit value of the converted transmission color data, pictogram data, and frame data. No color change occurs.

  In addition, you may combine said Embodiment 1 and 2. FIG. Not only can a configuration for realizing the functions according to the present invention be provided in advance as a display control apparatus, but also an existing display control apparatus can be caused to function as the display control apparatus according to the present invention by applying a program. That is, by applying a display control program for realizing each functional configuration by the display control devices 190 and 290 exemplified in the above embodiment so that a computer (such as a CPU) that controls an existing display device can be executed. The display control devices 190 and 290 according to the present invention can function. The display control method according to the present invention can be implemented using the display control devices 190 and 290.

  Such a program distribution method is arbitrary. For example, the program can be distributed by being stored in a recording medium such as a memory card, a CD-ROM, or a DVD-ROM, or via a communication medium such as the Internet. .

  Although the preferred embodiments of the present invention have been described in detail above, the present invention is not limited to the specific embodiments, and various modifications, within the scope of the gist of the present invention described in the claims, It can be changed.

B ... Background image, C, C0 ... Composite image, F1, F2 ... Foreground image, MP, MS ... Area (non-transparent area), P ... Pictographic image, TA ... Transparent Area, 100, 200 ... portable communication terminal, 190, 290 ... display control device, 190a ... power regulator, 190b ... DC-DC converter, 190c ... backlight inverter, 190d ... CPLD, 190e ... SRAM, 190f ... bus buffer, 190g, 190h ... data bus, 191, 291 ... data acquisition unit, 192 ... data conversion unit, 193 ... LCDC memory, 194: Image composition unit, 194a, 292 ... Data selection unit, 194b ... Data composition unit, 195 ... Display control unit, 101, 202 ... LCD, 102 202 ... Speaker, 103, 203 ... Microphone, 104, 204 ... Operation keys, 105, 290a ... CPU, 106, 290b ... RAM, 107, 290c ... ROM, 108, 208 ... Media controller, 109,209 ... Signal processing unit, 110,210 ... Antenna, 290d ... LCDC

Claims (7)

Data acquisition means for acquiring image data representing a partial image that is a part of the foreground image;
Data selection means for selecting data different from the pixel data representing the pixel color of the partial image, which is represented by the image data obtained by the data obtaining means, as transparent color data for determining the color of the transparent area of the foreground image When,
A synthesized image obtained by synthesizing the corresponding area of the background image corresponding to the transparent area with respect to the transparent area of the foreground image represented by the transparent color determined by the transparent color data selected by the data selection means is displayed. Display control means for controlling the display unit,
A display control device characterized by that. The data acquisition means further acquires default transmission color data,
Further comprising data conversion means for converting the default transparent color data acquired by the data acquisition means into data different from any of the pixel data;
The data selection means selects the default transmission color data converted by the data conversion means as transmission color data that determines the color of the transmission area.
The display control apparatus according to claim 1. The data conversion means converts a bit value stored at a predetermined position of the pixel data constituting the image data acquired by the data acquisition means into a predetermined value, and transmits the default transmission acquired by the data acquisition means. Converting the bit value stored in the predetermined position of the color data into a value different from the predetermined value;
The display control apparatus according to claim 2. The data conversion unit increases or decreases the number of bits of pixel data constituting the image data acquired by the data acquisition unit,
The predetermined position of the pixel data is a position different from the position where the bit value of the pixel data before conversion is stored.
The display control apparatus according to claim 3. The predetermined position of the pixel data is a position on the lower side of the center position among all positions.
The display control apparatus according to claim 3, wherein the display control apparatus is a display control apparatus. Computer
Data acquisition means for acquiring image data representing a partial image that is a part of the foreground image;
Data selection means for selecting data different from the pixel data representing the pixel color of the partial image, which is represented by the image data obtained by the data obtaining means, as transparent color data for determining the color of the transparent area of the foreground image When,
A synthesized image obtained by synthesizing the corresponding area of the background image corresponding to the transparent area with respect to the transparent area of the foreground image represented by the transparent color determined by the transparent color data selected by the data selection means is displayed. Function as display control means for controlling the display unit,
A display control program characterized by that. A data acquisition step of acquiring image data representing a partial image that is a part of the foreground image;
A data selection step of selecting data different from pixel data representing the pixel color of the partial image, which is represented by the image data acquired in the data acquisition step, as transmission color data for determining the color of the transmission region of the foreground image When,
A synthesized image obtained by synthesizing the corresponding area of the background image corresponding to the transparent area with respect to the transparent area of the foreground image represented by the transparent color determined by the transparent color data selected in the data selection step is displayed. A display control step for controlling the display unit.
A display control method characterized by the above.

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