JP2007274521A - Output controller - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an output controller capable of suppressing a decrease in sharpness of a display image. <P>SOLUTION: The output controller 10 includes a CPU 32 and moving picture contents are input by an antenna 12, a tuner module 14, a TS decoder 16, and a video decoder 22. Video data of a plurality of pictures forming the moving picture contents which are thus input are written to a video area 36b by a CPU 32. The CPU 32 specifies respective pieces of video data of the plurality of written pictures in the order of movements of the moving picture contents. The specified video data are read out by the CPU 32. The CPU 32 also decides whether the video data to be read out have satisfactory sharpness conditions. When the decision result of the decision means is not affirmative, the readout processing is inhibited by the CPU 32. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an output control apparatus, and more particularly to an output control apparatus that is applied to, for example, a portable terminal and decodes image data received in an environment having a limited transmission band.

  An example of a conventional device of this type is disclosed in Patent Document 1. According to this prior art, the demultiplexer 22 extracts video packets and audio packets from digital broadcast data of a desired channel selected by operating the operation panel 62. The extracted video packets are extracted from the MPEG4 video decoder 26. Given to. The MPEG4 video decoder 26 decodes a given video packet to generate video data, and the generated video data is output toward the LCD monitor 32. As a result, a moving image of the program content broadcast on the selected channel is displayed on the screen of the LCD monitor 32.

Here, the video data decoded by the MPEG4 video decoder 26 is divided into a P picture decoded with reference to the video data of the other screen and an I picture decoded without referring to the video data of the other screen. .
JP 2004-297692 A [H04M 11/08, 1/00, 1/725, H04Q7 / 38]

  However, in the prior art, the data size is severely limited under an environment where the transmission band is limited, and the image area of the high frequency component based on the I picture is lost and transmitted. Therefore, when the I picture is decoded, it is reproduced on the LCD. The sharpness of the display image to be reduced is low.

  Therefore, a main object of the present invention is to provide an output control device capable of suppressing a decrease in sharpness of a display image.

  An output control device (10) according to the invention of claim 1 includes a capturing means (12, 14, 16, 22) for capturing moving image content, and a memory for storing image data of a plurality of screens forming the moving image content captured by the capturing means. (36b) writing means (S23), designation means (S71, S73, S75) for designating each of the image data of the plurality of screens written by the writing means in order along the motion of the moving image content, designation by the designation means Reading means (S65) for reading out the read image data, determination means (S45) for determining whether or not the image data to be read by the reading means satisfies the sharpness condition, and when the determination result of the determination means is negative Prohibiting means (S63) for prohibiting the reading process of the reading means is provided.

  The moving image content is captured by the capturing unit. Image data of a plurality of screens forming the moving image content captured by the capturing unit is written into the memory by the writing unit. The designation means designates each of the image data of the plurality of screens written by the writing means in the order along the motion of the moving image content. The image data specified by the specifying unit is read by the reading unit. The discriminating unit discriminates whether or not the image data to be read by the reading unit satisfies the sharpness condition. If the determination result of the determining means is negative, the reading process of the reading means is prohibited by the prohibiting means.

  Therefore, the image data stored in the memory is read in the order along the motion of the moving image content as long as the sharpness condition is satisfied. The moving image content is accurately reproduced along the time axis. If image data that does not satisfy the sharpness condition is found, reading of the image data is prohibited. This avoids a situation where the sharpness of the reproduced moving image is lowered.

  An output control apparatus according to a second aspect of the present invention is dependent on the first aspect, wherein the first encoded image data and the other encoded image data of a plurality of screens forming the moving image content are decoded with reference to the image data of the other screen. And the second encoded image data that is decoded without referring to the screen, and the sharpness condition includes an image condition that the image data specified by the specifying means is related to the second encoded image data.

  According to the invention of claim 2, the image data of a plurality of screens forming the moving image content is decoded without referring to the first encoded image data decoded with reference to the image data of the other screen and the other screen. Second encoded image data. The image condition included in the sharpness condition is focused on the second encoded image data having a data size larger than that of the first encoded image data, and the image data related to the second encoded image data is determined by the determining unit. . As a result, it is possible to prevent a reduction in the sharpness of a moving image that appears regularly.

  The output control apparatus according to the invention of claim 3 is dependent on claim 2, and the sharpness condition further includes a threshold condition that the size of the second encoded image data exceeds the first threshold value.

  According to the invention of claim 3, the first threshold value condition included in the sharpness condition focuses on whether or not the size of the second encoded image data exceeds the first threshold value. If the size of the second encoded image data exceeds the first threshold value, the sharpness condition is satisfied, and thereby the image is accurately reproduced along the time axis. Further, if the size of the second encoded image data is equal to or smaller than the first threshold value, the sharpness condition is not satisfied, and a situation in which the sharpness of the moving image reproduced thereby is reduced is avoided.

  The output control device according to the invention of claim 4 is dependent on claim 2, and is a calculation means (S93) for calculating a change amount between a reproduced image corresponding to the second encoded image data and a reproduced image adjacent thereto. And the sharpness condition further includes a range condition in which the amount of change calculated by the calculation means belongs to the predetermined range.

  According to the invention of claim 4, the range condition included in the sharpness condition is that the amount of change between the reproduced image corresponding to the second encoded image data and the reproduced image adjacent thereto belongs to the predetermined range. Pay attention to. If the amount of change between the reproduced image corresponding to the second encoded image data and the reproduced image adjacent thereto falls within the predetermined range, the sharpness condition is satisfied, and thus the image is accurately reproduced along the time axis. The If the amount of change between the reproduced image corresponding to the second encoded image data and the reproduced image adjacent thereto does not fall within the predetermined range, the sharpness condition is not satisfied, and the sharpness of the moving image reproduced thereby Is avoided.

  The output control device according to the invention of claim 5 is dependent on any one of claims 2 to 4, wherein the capturing means includes decoding means (22) for decoding the first encoded image data and the second encoded image data, The writing means writes the video data decoded by the decoding means into the memory.

  According to the invention of claim 5, the decoding means included in the capturing means decodes the first encoded image data and the second encoded image data, and the video data decoded by the decoding means is temporarily written in the memory. Written by. As a result, the moving image content reproduced by the image data of a plurality of screens is displayed smoothly.

  The output control device according to the invention of claim 6 is dependent on claim 1, and each of the image data of a plurality of screens forming the moving image content is encoded image data formed by a plurality of data blocks, and The number decreases as the sharpness of the image decreases, and the sharpness condition further includes a second threshold condition that the number of data blocks forming the encoded image data exceeds the second threshold.

  According to the invention of claim 6, each of the image data of a plurality of screens forming the moving image content is encoded image data formed by a plurality of data blocks, and the number of data blocks decreases the sharpness of the image. Decrease. The second threshold condition included in the sharpness condition focuses on whether or not the number of data blocks forming the encoded image data exceeds the second threshold. If the number of data blocks forming the encoded image data is equal to or smaller than the second threshold value, the sharpness condition is satisfied, and accordingly, the data is accurately reproduced along the time axis. If the number of data blocks forming the encoded image data exceeds the second threshold value, the sharpness condition is not satisfied, and a situation in which the sharpness of the reproduced moving image is reduced is avoided.

  The output control device according to the invention of claim 7 is dependent on any one of claims 1 to 6, and includes a display means (30) for displaying an image based on the image data read by the reading means, and a prohibiting process of the prohibiting means. In addition to this, it further comprises request means (S67) for requesting the display means to redisplay the preceding image.

  According to the invention of claim 7, the display means displays an image based on the image data read by the reading means, and the request means causes the display means to redisplay the preceding image in connection with the prohibiting process of the prohibiting means. Request. As a result, the preceding image is displayed again by the display unit at the timing when the image data prohibited by the prohibiting unit, that is, the image data that does not satisfy the sharpness condition should be displayed.

  The output control device according to the invention of claim 8 is dependent on any one of claims 1 to 5, and the image data of a screen different from the screen prohibited to be read by the prohibiting means is stored in the memory in association with the prohibiting process by the prohibiting means. Alternative reading means (S81) for reading is further provided. Thereby, at the timing when image data that does not satisfy the sharpness condition is to be displayed, the preceding image is read again by the alternative reading means.

  An output control program according to the invention of claim 9 is a moving image captured by the processor (32) of the output control device (10) provided with capturing means (12, 14, 16, 22) for capturing moving image content. A writing step (S23) for writing image data of a plurality of screens forming content into the memory (36b), and a specifying step for specifying each of the image data of the plurality of screens written by the writing step in the order along the motion of the moving image content ( S71, S73, S75), a reading step (S65) for reading the image data specified in the specifying step, a determining step (S45) for determining whether the image data to be read in the reading step satisfies the sharpness condition, and When the determination result of the determination step is negative, a prohibition step (S63) for prohibiting the reading process of the reading step is executed. Of, which is the output control program.

  An output control method according to the invention of claim 10 is an output control method of an output control device (10) comprising a capturing means (12, 14, 16, 22) for capturing moving image content, wherein the moving image is captured by the capturing means. A writing step (S23) for writing the image data of the plurality of screens forming the image content into the memory (36b), and a designation step for designating each of the image data of the plurality of screens written by the writing step in the order along the motion of the moving image content (S71, S73, S75), a reading step (S65) for reading the image data specified in the specifying step, a determining step (S45) for determining whether the image data to be read in the reading step satisfies the sharpness condition, And an output including a prohibition step (S63) for prohibiting the readout process of the readout step when the discrimination result of the discrimination step is negative It is a control method.

  In the ninth and tenth aspects, as in the first aspect, the image data stored in the memory is read in the order along the motion of the moving image content unless the sharpness condition is satisfied. The moving image content is accurately reproduced along the time axis. When image data matching the sharpness condition is found, reading of this image data is prohibited. This avoids a situation where the sharpness of the reproduced moving image is lowered.

  According to the present invention, the image data stored in the memory is read in the order along the motion of the moving image content unless the sharpness condition is met. The moving image content is accurately reproduced along the time axis. When image data matching the sharpness condition is found, reading of this image data is prohibited. This avoids a situation where the sharpness of the reproduced moving image is reduced or deteriorated.

  The above object, other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

  With reference to FIG. 1, the mobile terminal 10 of this embodiment includes an antenna 12. When the program viewing mode is selected by operating the input device (operation panel) 38, the tuner module 14 is given a command corresponding to the channel selection of a desired channel (service) by the CPU 32.

  The tuner module 14 demodulates a high-frequency signal of terrestrial digital broadcasting captured by the antenna 12 and outputs an MPEG-TS (Transport Stream) of a desired channel. The TS decoder 16 separates the MPEG-TS given from the tuner module 14 into audio PES (Packetized Elementary Stream), data PES, video PES, and PCR (Program Clock Reference). The separated audio PES, data PES, video PES and PCR are applied to the audio decoder 18, data decoder 20, video decoder 22 and CPU 32, respectively.

  The audio decoder 18 decodes the audio PES, and PCM (Pulse Code Modulation) data obtained thereby is converted into an audio signal by the D / A circuit 24, and the speaker 26 outputs the audio signal.

  The data decoder 20 converts the data PES into ES, decodes the converted ES, and generates character image data corresponding to an image such as an icon. The character image data is given to the graphic control circuit 28 by the data decoder 20. The data PES includes EPG (Electronic Program Guide) data related to program information in addition to icons.

  The video decoder 22 de-packets the video PES and extracts a header and an ES (Elementary Stream). The video decoder 22 also decodes the ES to generate video data and information related to the video data. The video data is stored in the RAM 36 by the CPU 32, and information related to the PES header and the video data is stored in a memory 22 m formed in the video decoder 22.

  The header includes display time information (hereinafter referred to as PTS (Presentation Time Stamp)) indicating timing for displaying video data. Video data is divided into a P picture that is decoded with reference to other video data and an I picture that is decoded without reference to other video data. Information related to video data includes attribute information indicating that the video data is one of an I picture and a P picture, and data size information before the video data is decoded by the video decoder 22.

  As shown in FIG. 2, the RAM 36 includes a work area 36a and a video area 36b. In the work area 36a, setting information of a variable Kr, a variable Kw, a variable Kr and a flag Flag [x] (x = 1 to 3), which will be described later, information related to video data, and a header are appropriately written. Three buffers [1] to [3] configured in a ring shape are formed in the video area 36b. Each of the buffers [1] to [3] has an empty area corresponding to video data for one frame. When the program viewing mode is selected, black image data is stored in the buffers [1] to [3].

  Returning to FIG. 1, the stored video data is read by the CPU 32 in response to a display update time (described later). The display device 30 includes an LCD 30L and a frame buffer 30B. The CPU 32 gives a screen layout command corresponding to the LCD 30L to the graphic control circuit 28. The graphic control circuit 28 synthesizes character image data and video data in accordance with this command, and outputs the synthesized data obtained thereby to the display device 30.

  The display device 30 temporarily stores the composite data in the frame buffer 30B, and outputs the composite data to the LCD 30L in response to the display timing. As a result, audio and video of a television broadcast program (hereinafter simply referred to as “broadcast program”) provided on a desired channel are output from the speaker 26 and the LCD 30L, respectively.

  The communication device 40 has a call function and a web access function. For example, when the web access function is used, the mobile terminal 10 receives video data via the Internet (not shown) and displays the obtained video data on the LCD 30L.

  When the program viewing mode is selected, the CPU 32 first sets a variable Kw indicating the write destination of the RAM 36 to “3”, sets a variable Kr indicating the read destination of the RAM 36 in the buffer [2], and stores it in the frame buffer 30B. The variable Lr corresponding to the stored composite data is set to “1”, and the flag Flag [Kw] corresponding to the write destination of the RAM 36 is set to “0”.

  When the above initialization is completed, a write task and a read task are activated. In the writing task, the CPU 32 first waits until a writable buffer is secured in the RAM 36. When a buffer writable in the RAM 36 is secured, the CPU 32 next writes the video data obtained from the video decoder 22 via the bus B1 into the buffer [Kw].

  Subsequently, the CPU 32 takes in the information related to the video data from the memory 22m into the work area 36a, and the video data is the video data related to the I picture from the attribute information included in the information related to the video data taken into the work area 36a. It is determined whether or not there is. When the video data to be written into the RAM 36 is related to the P picture, the degree of blur of the video data is considered weak. On the other hand, when the video data to be written in the RAM 36 is related to the I picture, the CPU 32 determines from the data size information included in the information related to the video data to determine whether the blur degree of the I picture is strong or not. The data size is extracted, and it is determined whether or not the extracted data size exceeds the threshold value TH.

  If the data size of the I picture exceeds the threshold value TH, it is determined that the degree of blur of the I picture is weak, and the flag Flag [Kw] is set to “0”. On the other hand, if the data size is equal to or smaller than the threshold value TH, it is determined that the degree of blur of the I picture is strong, and the flag Flag [Kw] is set to “1”.

  When the setting of the flag Flag [Kw] is completed, the CPU 32 designates the variable Kw in the order along the movement of the broadcast program. For example, the order along the movement of a desired broadcast program starts from buffer [3], and buffer [3] (program video) → buffer [1] (program video) → buffer [2] (program video) → buffer [3 ] (Program video)... And circulates through the ring-shaped buffers [1] to [3].

  In the read task, the CPU 32 first waits until the display update time is reached. The display update time is obtained based on the PCR obtained from the TS decoder 16 and the PTS obtained from the PES header.

  When the display update time comes, the CPU 32 next determines whether or not the sharpness condition is satisfied. If the sharpness condition is satisfied, that is, if the flag Flag [Kr] is “0”, the CPU 32 determines that the degree of blur of the video data stored in the buffer [Kr] is weak, and stores it in the buffer [Kr]. Read video data. As a result, the moving image displayed on the LCD 30L is accurately reproduced along the time axis.

  If the sharpness condition is not satisfied, that is, if the flag Flag [Kr] is “1”, the CPU 32 determines that the degree of blur of the video data stored in the buffer [Kr] is strong, and sends a redisplay command to the display device 30. Issue. The display device 30 again outputs the composite data stored in the frame buffer 30B according to this instruction. As a result, the reproduced moving image temporarily deviates from the time axis, but the reduction in sharpness is suppressed.

  When the reading process according to the setting of the flag Flag [Kr] is completed, the numerical value shown in the variable Kr is substituted into the variable Lr. As a result, the composite data stored in the frame memory 30B of the display device 30 matches the composite data based on the video data stored in the buffer [Lr].

  Subsequently, the CPU 32 updates the variable Kr according to the order of the variable Kw designated by the writing task. For example, the reading order of the desired broadcast program shown above starts from buffer [2], buffer [2] (black image) → buffer [3] (program video) → buffer [1] (program video) → buffer [ 2] (program video). At this time, the video data read out by the CPU 32 is displayed on the LCD 30L with a delay of one frame. That is, the buffers [1] to [3] corresponding to the output order to the LCD 30L start from the buffer [1], and buffer [1] (black image) → buffer [2] (black image) → buffer [3] (program) Transition from buffer [1] to buffer [3] as shown in (video) → buffer [1] (program video).

  Here, the variable Kw is updated when a writable buffer is secured in the RAM 36. The variable Kr waits until a writable buffer is secured in the RAM 36, and is updated in response to the display update time when the variable Kw is updated. That is, the video data is stored in the RAM 36 by the writing task and then read by the reading task. As a result, processing failure is avoided.

  When the data size of the I picture shown in FIG. 3 exceeds the threshold value TH, the sharpness condition of the video data to be read is satisfied. At this time, as shown in FIG. 4, the write destination of the RAM 36 starts from the buffer [3], and the buffer [3] → buffer [1] → buffer [2] → buffer [3]. [1] to [3] are circulated. The reading destination of the RAM 36 starts from the buffer [2], and the buffer [1] to the buffer [3] as shown in buffer [2] → buffer [3] → buffer [1] → buffer [2]. Circulate.

  On the other hand, when the I picture shown in FIG. 3 is equal to or less than the threshold value TH, the sharpness condition of the video data to be read is not satisfied. At this time, as shown in FIG. 5, the write destination of the RAM 36 starts from the buffer [3], and the buffer [3] → buffer [1] → buffer [2] → buffer [3]. While circulating from [1] to buffer [3], the reading destination of the RAM 36 starts from buffer [2] and becomes buffer [2] → buffer [2] → buffer [1]. As a result, the reading process to the buffer storing the I picture having the data size exceeding the threshold value TH is prohibited.

  As described above, the moving image content is captured by the antenna 12, the tuner module 14, the TS decoder 16 and the video decoder 22. The video data of a plurality of screens that form the captured moving image content is written into the video area 36b by the CPU 32. The CPU 32 designates each of the written video data of the plurality of screens in the order along the motion of the moving image content. The designated video data is read by the CPU 32. The CPU 32 also determines whether the video data to be read satisfies the sharpness condition. If the determination result of the determination means is negative, the reading process is prohibited by the CPU 32.

  Accordingly, the video data stored in the video area 36b is read in the order along the motion of the moving image content as long as the sharpness condition is satisfied. The moving image content is accurately reproduced along the time axis. When video data that does not satisfy the sharpness condition is found, reading of the video data is prohibited. This avoids a situation where the sharpness of the reproduced moving image is lowered.

  The CPU 32 is a multitask CPU equipped with a multitask OS such as μITRON, and executes the main task shown in FIG. 6, the write task shown in FIGS. 7 and 8, and the read task shown in FIG. The control program of the flowchart related to the mobile terminal 10 is stored in the ROM 34.

  With reference to FIG. 6, in step S <b> 1, it is determined whether or not a program viewing mode by the input device 38 is performed. If the determination result is NO, other processing is executed in step S3, and if the determination result is YES, initialization is executed in step S5. At this time, the variable Lr, variable Kr, variable Kw, and flag Flag [x] (x = 1 to 3) are set to “1”, “2”, “3”, and “0”, respectively.

  In step S7, a write task and a read task are activated. In step S9, the process waits until an end operation is performed by the input device 38. When the end operation is performed, the end process is executed in step S11, and the process returns to step S1. As a result, the write task and the read task are stopped.

  According to FIG. 7, the process waits until a writable buffer is secured in the RAM 36 in step S21. When a writable buffer is secured in the RAM 36, the video data obtained from the video decoder 22 is buffered [Kw] in step S23. Write to. In step S25, skip determination processing is executed. Thereby, the reading destination of the RAM 36 is appropriately set.

  In step S27, “1” is added to the variable Kw. In step S29, it is determined whether or not the variable Kw exceeds “3”. If the determination result is NO, the process returns to step S21. If the determination result is YES, "1" is set to the variable Kw in step S31, and the process returns to step S21. As a result, the write destination to the RAM 36 is designated in the order along the movement of the broadcast program.

  The skip determination process in step S25 is executed according to a subroutine shown in FIG. In step S41, information related to the video data is taken from the memory 22m into the work area 36a. In step S43, it is determined whether or not the video data written to the buffer [Kw] is video data related to the I picture from the attribute information included in the information related to the captured video data. Accordingly, it is possible to prevent a reduction in the sharpness of the moving image that periodically appears on the LCD 30L.

  When the video data written to the buffer [Kw] is related to the P picture, the process proceeds to step S49. On the other hand, when the video data written to the buffer [Kw] corresponds to the I picture, the information related to the video data is displayed at step S45. It is determined whether or not the data size of the I picture exceeds the threshold value TH from the included data size information. If the data size is equal to or smaller than the threshold value TH, it is determined that the video data written in the buffer [Kw] has a high degree of blur, and the flag Flag [Kw] is set to “1” in step S47. On the other hand, if the data size exceeds the threshold value TH, it is determined that the video data written in the buffer [Kw] has a low degree of blur, and the flag Flag [Kw] is set to “0” in step S49. When such setting processing is completed, the routine returns to the upper hierarchy.

  According to FIG. 9, the process waits until the display update time comes in step S61. When the display update time comes, it is determined in step S63 whether or not the flag Flag [Kr] is “0”. When the flag Flag [Kr] is “0”, that is, when the data size associated with the video data stored in the buffer [Kr] is any of an I picture and a P picture exceeding the threshold TH, the buffer [Kr] It is determined that the video data stored in is low in the degree of blur, and the video data stored in the buffer [Kr] is read out. As a result, the moving image displayed on the LCD 30L is accurately reproduced along the time axis.

  When the flag Flag [Kr] is “1”, that is, when the data size related to the video data stored in the buffer [Kr] is an I picture having a threshold value TH or less, the video data stored in the buffer [Kr] is It is determined that the degree of blur is strong, and a redisplay command is issued to the display device 30 in step S67. As a result, the reproduced moving image temporarily deviates from the time axis, but the deterioration of the image quality is suppressed.

  In step S69, the variable Kr is substituted for the variable Lr. The composite data stored in the frame memory 30B of the display device 30 matches the composite data based on the video data stored in the buffer [Lr].

  In step S71, “1” is added to the variable Kr. In step S73, it is determined whether or not the variable Kr exceeds “3”. If the determination result is NO, the process proceeds to step S77, while if the determination result is YES, the variable Kr is set to “1” in step S75, and the process proceeds to step S77. In step S77, the process waits while the variable Kw matches the variable Kr. Here, the variable Kr waits until a writable buffer is secured in the RAM 36, and when the variable Kw is updated, it is updated in response to the display update time. That is, the video data is read by the reading task after being stored by the writing task. As a result, processing failure is avoided.

  In this embodiment, it has been described that the display device 30 reads the combined data stored in the frame buffer 30B in accordance with the redisplay command given from the CPU 32. However, the present invention is not limited to this, and the display device 30 prohibits reading of the composite data stored in the frame buffer 30B according to the redisplay command. As a result, an image based on the composite data displayed on the LCD 30L is displayed again.

The threshold value TH depends on the subjective image quality evaluation, the frame rate, and the image size. In order to send a clear 15fps video at cbr (Constant Bit Rate) with an image size of LCD30L (horizontal 320 pixels x vertical 180 pixels), if the image quality subjective evaluation result that 400 kbps is required is obtained, Based on the value, an index for clearly reproducing the moving image on the screen of the LCD 30L is defined. Here, the threshold value TH is given by the calculation result shown in Formula 1.
[Equation 1]
TH = 400 (Kbps) / (15 (fps) * 8 (Byte))
Furthermore, in this embodiment, it has been described that video data with a high degree of blur is arbitrarily dropped. However, according to the frame dropping operation by the input device 38, it is possible to select either permission or rejection of frame dropping of video data with a high degree of blur.

  In this embodiment, it has been described that video data with a high degree of blur is not displayed by causing the display device 30 to issue a redisplay command when the flag Flag [Kr] is “1”. However, the present invention is not limited to this, and the video data stored in the buffer [Lr] can be read instead of the operation of giving a redisplay command to the display device 30.

  Since the portable terminal 10 of another Example is the same as that of the Example of FIGS. 1-9 except the point described below, description regarding the same structure is abbreviate | omitted.

  CPU32 performs the process of step S81 shown in FIG. 10 instead of the process of step S67 shown in FIG. According to FIG. 10, if the flag Flag [Kr] is “1” in step S63, the video data stored in the buffer [Lr] is read in step S81. Thereby, the failure of processing is avoided without providing the display device 30 with a frame buffer.

  Further, in this embodiment, it is determined whether or not the video data has a degree of blur by comparing the threshold value TH with the data size of the I picture. The threshold condition is not limited to this, and it is also possible to calculate the amount of change between the reproduced image corresponding to the I picture and the reproduced image adjacent thereto and determine whether or not the calculation result belongs to the predetermined range. It is.

  The portable terminal 10 of the other embodiment is the same as the embodiment of FIGS. 1 to 9 except for the points described below, and thus the description of the same configuration is omitted.

  According to FIG. 11, the CPU 32 obtains the attribute information, the data size Size [Kw] of the video data, and the data size NextSize to be decoded next to the video data from the information related to the video data captured in the work area 36a in step S91. read out. In step S43, it is determined whether the video data is an I picture. If the video data is an I picture, the process proceeds to step S93. If the video data is a P picture, the process proceeds to step S49. In step S93, the amount of change is calculated according to the calculation formula [Equation 2].

[Equation 2]
Change amount = (NextSize / Size [Kw]) * 100
In step S95, it is determined whether or not the change amount belongs to a predetermined range. If the change amount belongs to the predetermined range, it is determined that the sharpness condition is satisfied, and the process proceeds to step S49. On the other hand, if the change amount does not belong to the predetermined range, it is determined that the sharpness condition is not satisfied, and the process proceeds to step S47. In step S97, the data size Size [Kw] of the video data is substituted into the data size PastSize decoded just before the video data, and the substituted data size PastSize is stored in the work area 36a. When this processing is completed, the routine returns to the upper-level routine. As a result, if the sharpness condition is satisfied, the reproduced moving image is accurately reproduced along the time axis, and if the sharpness condition is not satisfied, the situation where the sharpness of the reproduced moving image is reduced is avoided. Is done. In the default range, “90” is assigned to the lower limit value and “100” is assigned to the upper limit value.

In this embodiment, the change amount is calculated by paying attention to the video data and the next data of the video data. However, the present invention is not limited to this, and the amount of change can be calculated based on the data size PastSize and the data size Size [Kw] of the video data stored in the work area 36a in step S97. At this time, the amount of change calculated in step S93 is obtained according to the calculation formula of [Equation 3]. Note that “0” is assigned to the lower limit value and “50” is assigned to the upper limit value in the predetermined range to be compared with the change amount in step S95.
[Equation 3]
Change amount = (PastSize / Size [Kw]) * 100
Furthermore, in this embodiment, it is determined whether or not the video data has a degree of blur by comparing the threshold value TH with the data size of the I picture. However, the threshold condition is not limited to this, and it is also possible to determine the ES decoded by the video decoder 22 by the number of MB (Macro Block) of 4 horizontal pixels × 4 vertical pixels. For example, when the number of MBs of horizontal 4 pixels × vertical 4 pixels to be decoded is 30 or less, it is considered that the sharpness of the video data decoded by the video decoder 22 is low. That is, when the ES having the number of MBs of horizontal 4 pixels × vertical 4 pixels of 30 or less is decoded, it is determined that the video data with a strong degree of blur is stored in the RAM 36.

  Furthermore, since the portable terminal 10 of another Example is the same as Example of FIGS. 1-9 except the point described below, the description regarding the same structure is abbreviate | omitted.

  CPU32 performs the process of step S101 shown in FIG. 12 instead of the process of steps S43 and 45 shown in FIG. According to FIG. 12, it is determined whether or not the number of MBs of horizontal 4 pixels × vertical 4 pixels of the captured video data exceeds 30 from the information related to the captured video data in the work area 36a in step S101. If the determination result is affirmative, it is determined that the sharpness condition is satisfied, and the process proceeds to step S47. If the determination result is negative, it is determined that the sharpness condition is not satisfied, and the process proceeds to step S45. As a result, if the sharpness condition is satisfied, the reproduced moving image is accurately reproduced along the time axis, and if the sharpness condition is not satisfied, the situation where the sharpness of the reproduced moving image is reduced is avoided. Is done.

It is a block diagram which shows the structure of one Example of this invention. It is an illustration figure which shows an example of the memory mapping of RAM36 applied to the FIG. 1 Example. It is an illustration figure which shows an example of the data size of a desired broadcast program. FIG. 10 is an illustrative view showing one example of operations of buffers [1] to [3] formed in a RAM 36 applied to the embodiment in FIG. 1 and a frame buffer 30B formed in the display device 30; FIG. 10 is an illustrative view showing another example of operations of the buffers [1] to [3] formed in the RAM 36 applied to the embodiment in FIG. 1 and the frame buffer 30B formed in the display device 30; It is a flowchart which shows an example of operation | movement of CPU32 applied to the FIG. 1 Example. It is a flowchart which shows another example of operation | movement of CPU32 applied to the FIG. 1 Example. It is a flowchart which shows another example of operation | movement of CPU32 applied to the FIG. 1 Example. It is a flowchart which shows another example of operation | movement of CPU32 applied to the FIG. 1 Example. It is a flowchart which shows a part of operation | movement of CPU32 applied to the other Example of this invention. It is a flowchart which shows a part of operation | movement of CPU32 applied to the other Example of this invention. It is a flowchart which shows a part of operation | movement of CPU32 applied to the further another Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Portable terminal 14 ... Tuner module 16 ... TS decoder 22 ... Video decoder 30 ... Display device 32 ... CPU
36 ... RAM

Claims (10)

Capture means for capturing video content;
Writing means for writing, into a memory, image data of a plurality of screens forming the moving image content captured by the capturing means;
Designating means for designating each of the image data of the plurality of screens written by the writing means in the order along the motion of the moving image content;
Reading means for reading the image data designated by the designation means;
A discriminating unit that discriminates whether or not image data to be read by the reading unit satisfies a sharpness condition; and a prohibiting unit that prohibits the reading process of the reading unit when a discrimination result of the discriminating unit is negative. , Output control device. The image data of a plurality of screens forming the moving image content includes first encoded image data decoded with reference to image data of another screen and second encoded image data decoded without referring to the other screen. Including
The output control apparatus according to claim 1, wherein the sharpness condition includes an image condition that the image data specified by the specifying means is related to the second encoded image data.   The output control apparatus according to claim 2, wherein the sharpness condition further includes a first threshold condition that a size of the second encoded image data exceeds a first threshold. A calculation unit that calculates a change amount between a reproduction image corresponding to the second encoded image data and a reproduction image adjacent thereto;
The output control device according to claim 2, wherein the sharpness condition further includes a range condition in which the amount of change calculated by the calculation unit belongs to a predetermined range. The capturing means includes decoding means for decoding the first encoded image data and the second encoded image data,
5. The output control apparatus according to claim 2, wherein the writing unit writes the video data decoded by the decoding unit into the memory. Each of the image data of a plurality of screens forming the moving image content is encoded image data formed by a plurality of data blocks,
The number of data blocks decreases as the image sharpness decreases,
The output control apparatus according to claim 1, wherein the sharpness condition further includes a second threshold condition that a number of data blocks forming the encoded image data exceeds a second threshold. A display means for displaying an image based on the image data read by the reading means, and a request means for requesting the display means to redisplay a preceding image in association with the prohibiting process of the prohibiting means. The output control device according to any one of 1 to 6.   The output according to any one of claims 1 to 7, further comprising: an alternative reading unit that reads image data of a screen different from a screen prohibited from being read by the prohibiting unit from the memory in association with a prohibiting process by the prohibiting unit. Control device. In the processor of the output control device provided with the capturing means for capturing the moving image content,
A writing step of writing, in a memory, image data of a plurality of screens forming the moving image content captured by the capturing unit;
A designation step of designating each of the image data of the plurality of screens written by the writing step in an order along the movement of the moving image content;
A reading step of reading out the image data specified in the specifying step;
A determination step of determining whether image data to be read by the reading step satisfies a sharpness condition; and a prohibition step of prohibiting the reading process of the reading step when a determination result of the determination step is negative Output control program to make An output control method of an output control apparatus including a capturing unit that captures moving image content,
A writing step of writing, in a memory, image data of a plurality of screens forming the moving image content captured by the capturing unit;
A designation step of designating each of the image data of the plurality of screens written by the writing step in an order along the movement of the moving image content;
A reading step of reading out the image data specified in the specifying step;
A discriminating step for discriminating whether or not the image data to be read out by the readout step satisfies a sharpness condition; and a prohibiting step for prohibiting the readout process of the readout step when the discrimination result of the discrimination step is negative , Output control method.

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