JP2008283311A - Image display device, and image display method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that it is difficult to make corrections adaptively to various image data and image contents so that, for example, even when image data for broadcasting and user-photographed image data are input both as television signals, similar corrections are not suitably made. <P>SOLUTION: It is decided whether input motion image data is a broadcast signal or non-broadcast signal (S5). When the motion image data is a broadcast signal, it is considered that the broadcast signal is already corrected to some extent, so a non-broadcast signal is corrected to a larger extent (S6, S7 and S8) to make a display (S9). Therefore, suitable corrections can be made based upon properties of the motion image data, and the motion image data can be displayed. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an image display device and an image display method, and more particularly to an image display device and an image display method for displaying moving image data.

  In recent years, digital video cameras have been popularized by the popularity of the Internet. This is because images captured by a digital video camera are easy for a computer to read, and the captured images can be edited, stored on a WWW (World Wide Web) server, and released to others. This is because it can be easily performed.

  Along with this, display devices such as displays are provided with external terminals in addition to those for television broadcasting, enabling display using a digital camera or the like as a video source.

  In general, in order to display beautifully a moving image from a video source such as a digital video camera, the image is corrected.

  A technique for correcting an image based on a histogram calculated from the image is disclosed as a technique for correcting the image. For example, a technique for performing backlight correction based on a histogram is disclosed (for example, see Patent Document 1). Further, for example, as shown in FIG. 11, a gradation correction method is disclosed in which the characteristics of an image are determined based on a color deviation ratio in a highlight portion of the image, and the degree of white balance correction is adjusted based on the result. For example, see Patent Document 2). Further, according to this method, the color of the object can be faithfully reproduced by appropriately correcting the contrast, highlight, and shadow at the same time.

  A technique for correcting an image with respect to an input luminance signal and an input color signal of a set of image signals is also disclosed for a general public broadcast video such as a television (hereinafter referred to as a television). (For example, refer to Patent Document 3).

Further, for example, a video signal of a television and an image signal output from an arithmetic device such as a computer generally have different gamma characteristics. Therefore, in the display device that enables a plurality of inputs having different gamma characteristics, the corresponding gamma correction is manually switched (for example, see Patent Document 4).
JP 2004-200808 A JP 11-317959 A JP-A-3-239072 Japanese Unexamined Patent Publication No. 07-066992

  The above-described conventional method for manually switching gamma correction is effective for video sources such as television signals and arithmetic device signals that have clearly different gamma characteristics. However, even if it is the same TV signal, for example, it is a source that has been properly adjusted by the producer, such as public broadcasting or package media, or if the adjustment content is uncertain due to personal creation You could think so. Therefore, even if the input form is a television signal, it has not been possible to perform correction to optimize the image quality for all input sources.

  That is, if a gamma correction is further performed on a public broadcast source that has already been corrected and displayed, excessive correction will be applied. Moreover, even if the same correction as that for public broadcasting is performed on a personally produced source, there is a problem that the correction is not correctly performed. In addition, Patent Documents 1 to 3 described above all show correction techniques for one image data, and do not enable adaptive correction for various image data and image content.

  The present invention has been made to solve the above-described problems, and provides an image display device and an image display method that can display images with appropriate correction based on attributes of moving image data. With the goal.

  As a means for achieving the above object, an image display apparatus of the present invention comprises the following arrangement.

  That is, input means for inputting moving image data, determination means for determining the content of correction already applied to the moving image data based on the attribute of the moving image data, and a determination result in the determining means And a display unit for displaying the moving image data corrected by the correction unit.

  For example, the determination means determines whether the moving image data is broadcast data obtained by receiving a public broadcast or other non-broadcast data.

  For example, when the image data is determined to be the non-broadcast data by the determination unit, the correction unit is more than the case where the video data is determined to be the broadcast data. Is also characterized in that the intensity of correction is increased.

  According to the present invention having the above-described configuration, it is possible to perform display with appropriate correction based on the attribute of moving image data.

  Hereinafter, the present invention will be described in detail based on preferred embodiments with reference to the accompanying drawings. The configurations shown in the following embodiments are merely examples, and the present invention is not limited to the illustrated configurations.

<First Embodiment>
FIG. 1 is a block diagram showing a configuration of an image display system in the present embodiment. In the figure, reference numeral 1 denotes an image display device, and reference numeral 2 denotes a tuner which receives a television broadcast signal and outputs an image signal. Reference numeral 3 denotes a video terminal for inputting an image signal, to which a device related to broadcasting is connected. Reference numeral 4 denotes a camcorder for a user to capture a moving image. Reference numeral 5 denotes a video terminal for inputting an image signal, to which a device related to the image signal taken by the user such as a video camera is connected.

  Reference numeral 7 denotes an input determination unit that determines whether there is an input from either the video terminal 3 or the video terminal 5. Reference numerals 8, 11, and 16 denote selectors that switch input / output destinations according to the output of the input determination unit 7. Reference numeral 9 denotes an A / D converter that converts an analog signal into a digital signal.

  In the present embodiment, gamma correction is performed on the input image. Here, for ease of explanation, it is assumed that a method similar to that of Patent Document 3 described above is applied with the configuration described below. However, the gamma correction method of the present invention is not limited to this example.

  Reference numeral 10 denotes a feature analyzer that analyzes image features in units of frames from input image data. The feature analyzer 10 creates a histogram or the like to analyze image features and calculates a reference correction value. Reference numeral 12 denotes a correction value calculator for calculating a correction value (broadcast system correction value) for image data related to television broadcasting based on the reference correction value, and reference numeral 14 denotes a correction value memory for storing the result. Reference numeral 13 denotes a correction value calculator that calculates a correction value (non-broadcast correction value) for image data related to the content photographed by the user based on the reference correction value, and 15 is a correction value memory for storing the result. is there. Reference numeral 17 denotes a frame memory for absorbing the processing delay and achieving synchronization.

  Reference numeral 18 denotes a gamma corrector that corrects the gamma value based on the calculated correction value. Reference numeral 19 denotes a display panel for displaying image data, which includes a PDP, liquid crystal, SED, OLED, and the like.

  Hereinafter, an image display operation in the image display system of the present embodiment configured as described above will be described.

  First, a case where the tuner 2 is turned on and image data related to broadcasting is displayed will be described. In this case, the image signal output from the tuner 2 is input to the input determination unit 7 and the selector 8 via the video terminal 3.

  When the input determination unit 7 detects that an image signal is input from the video terminal 3, the input of the selector 8 is set to the video terminal 3 side and the output destination of the selector 11 is set to the correction value calculator 12 side. 16 is the correction value memory 14 side.

  The image signal input from the video terminal 3 is input to the A / D converter 9 via the selector 8 and converted to digital image data, and input to the feature analyzer 10 and the frame memory 17.

  The feature analyzer 10 creates a luminance histogram and calculates a highlight point LH that is a highlight correction point and a shadow point LS that is a shadow correction point. These values are input to the correction value calculator 12 via the selector 11.

  In the correction value calculator 12, the highlight point LH` and the shadow point LS`, which are corrected so as to be suitable for the broadcast content, are inputted into the following formula (1) with respect to the inputted highlight point LH and shadow point LS. ). In Expression (1), α is a predetermined constant for adjusting the correction strength.

LH` = α × LH (1)
LS` = α x LS
These results are stored in the correction value memory 14 and then input to the gamma corrector 18 via the selector 16 to determine the gamma curve. FIG. 2 shows how the gamma curve is determined. In FIG. 2, a thick line 51 is a gamma curve before correction, whereas a dashed-dotted line 52 is the image data input from the tuner 2 after correction by the corrected highlight point LH` and shadow point LS`. The gamma curve of is shown.

  When the highlight point LH` and the shadow point LS` are stored in the correction value memory 14, the image data is read from the frame memory 17, and subjected to gamma correction according to the gamma curve indicated by the alternate long and short dash line 52, and displayed on the display panel 19.

  Next, a case where the camcorder 4 is turned on and image data related to content captured by the user is displayed will be described. In this case, the image signal output from the camcorder 4 is input to the input determination unit 7 and the selector 8 via the video terminal 5.

  When the input determination unit 7 detects that an image signal is input from the video terminal 5, the input of the selector 8 is set to the video terminal 5 side, the output destination of the selector 11 is set to the correction value calculator 13 side, and the selector 16 is the correction value memory 15 side.

  The image signal input from the video terminal 5 is input to the A / D converter 9 via the selector 8 and converted into digital image data, and input to the feature analyzer 10 and the frame memory 17.

  The feature analyzer 10 creates a luminance histogram and calculates a highlight point LH that is a highlight correction point and a shadow point LS that is a shadow correction point. These values are input to the correction value calculator 13 via the selector 11.

  In the correction value calculator 13, the highlight point LH` and the shadow point LS` corrected so as to be suitable for contents other than those for broadcasting with respect to the inputted highlight point LH and shadow point LS are expressed by the following formula ( 2). In equation (2), β is a predetermined constant for adjusting the correction strength.

LH` = β × LH (2)
LS` = β × LS
However, the following relationship is established between the constant β in Expression (2) and the constant α in Expression (1).

β ≧ α (3)
These results are stored in the correction value memory 15 and then input to the gamma corrector 18 via the selector 16 to determine the gamma curve. FIG. 2 shows how the gamma curve is determined. In FIG. 2, the thin line 53 indicates the gamma curve after correction by the corrected highlight point LH ′ and shadow point LS ′ with respect to the image data input from the camcorder 4 with respect to the gamma curve 51 before correction.

  When the highlight point LH` and the shadow point LS` are stored in the correction value memory 15, the image data is read from the frame memory 17, subjected to gamma correction according to the gamma curve indicated by the thin line 53, and displayed on the display panel 19.

  A simple flow of the image display process in the image display system of the present embodiment described above will be described with reference to the flowchart of FIG.

  First, in step S1, each part is initialized, and an input from the video terminal 3 or the video terminal 5 is awaited. If there is an input, it is determined in step S2 whether or not the end of the display process is instructed, and if there is no end instruction, the process proceeds to step S3.

  In step S 3, the signal input from the video terminal 3 or the video terminal 5 is digitized by the A / D converter 9 and stored in the frame memory 17. In step S4, feature analysis is performed on the image data input in the feature analyzer 10 to calculate a reference correction value.

  In step S5, if the input image signal relates to broadcasting, the process proceeds to step S6. Otherwise, the process proceeds to step S7. In step S6, the correction value calculator 12 corrects the reference correction value calculated in step S4 so that it becomes a broadcast correction value adapted to the broadcast content, and then proceeds to step S8. On the other hand, in step S7, the correction value calculator 13 corrects the reference correction value calculated in step S4 so that it becomes a non-broadcast correction value that is different from the broadcast content and adapted to the content photographed by the user. Then, the process proceeds to step S8.

  In step S8, the gamma corrector 18 corrects the image data using the corrected correction value (hereinafter, corrected correction value). In step S9, the corrected image data is displayed, and the process returns to step S2 to process the next image data.

  As described above, according to the present embodiment, the content of the correction already performed on the moving image data is determined based on the attribute of the moving image data, and the correction according to the determination result is performed. That is, it is appropriate for each of broadcast data that has already been subjected to advanced correction processing for public broadcasting and non-broadcast data that has been photographed by an individual user and would not have been subjected to advanced correction processing. Correction is possible. Therefore, in any case of moving image data, the image quality of the display image can be improved. In particular, for non-broadcast data, image quality can be suitably improved by performing correction more strongly than broadcast data.

  In the present embodiment, an example in which analog input is performed as image data has been described. However, a digital signal may be input and the A / D converter 9 may be omitted.

Second Embodiment
Hereinafter, a second embodiment according to the present invention will be described.

  FIG. 4 is a block diagram illustrating the configuration of the image display device according to the second embodiment. In FIG. 4, the same reference numerals are given to portions that perform the same functions as those in FIG. 1 of the first embodiment described above, and description thereof is omitted. In the second embodiment, gamma correction similar to that of Patent Document 3 described above is performed for ease of explanation.

  In the image display apparatus 101 shown in FIG. 4, 102 is a terminal for inputting multiplexed encoded data from the outside, and 103 is a separator for separating encoded data related to video from the multiplexed encoded data. .

  An input code determination unit 104 determines whether the input encoded data is based on DV encoding used in a camcorder or the like or MPEG encoding used in a broadcasting system.

  Reference numerals 105 and 108 denote selectors that switch input / output destinations according to the output of the input code determination unit 104. A DV decoder 106 decodes the DV encoded data to obtain image data. An MPEG-2 decoder 107 decodes MPEG-2 encoded data to obtain image data.

  Reference numerals 109 and 110 denote correction value memories for storing correction values for a predetermined number of frames. 111 and 112 are correction value smoothers that calculate smoothed correction values based on a plurality of correction values stored in the correction value memories 109 and 110.

  Hereinafter, an image display operation in the image display apparatus according to the second embodiment configured as described above will be described.

  First, encoded data is input to the separator 103 via a terminal 102 from an external device such as a tuner or a camcorder. The separator 103 extracts only the encoded data relating to the image data, arranges them in the decoding order, and outputs them to the input code determination unit 104 and the selector 105.

  The input code determination unit 104 determines the encoding method of the encoded data by detecting a characteristic part of each code in the input encoded data. For example, in the case of the MPEG-2 encoding method, since a code called a start code is always given to the first 4 bytes, if it is detected, it is found that the MPEG encoding is performed. In the second embodiment, as described above, it is determined whether or not the input encoded data is broadcast MPEG-2 encoding, and if it is not MPEG-2 encoding, it is camcorder DV encoding. Suppose that

  Hereinafter, the case where the input code determination unit 104 uses the MPEG-2 encoding, that is, the broadcast system, as input encoded data will be described.

  In this case, the output of the selector 105 is the MPEG-2 decoder 107 side, the input of the selector 108 is the MPEG-2 decoder 107 side, the output destination of the selector 11 is the correction value calculator 12 side, and the input destination of the selector 16 is. Is the correction value smoother 111 side.

  The MPEG-2 encoded data input via the selector 105 is decoded by the MPEG-2 decoder 107, and the decoded image data is input to the feature analyzer 10 and the frame memory 17 via the selector 108. The

  The feature analyzer 10 creates a luminance histogram of the input image data, and, as in the first embodiment described above, the highlight point LH, which is a highlight correction point, and the shadow point LS, which is a shadow correction point. Is calculated as a reference correction value. The calculated reference correction value is input to the correction value calculator 12 via the selector 11.

  As in the first embodiment described above, the correction value calculator 12 calculates the highlight point LH` and the shadow point LS` corrected by the equation (1), and uses them as broadcast system correction values as the correction value memory 109. To store. Here, the correction value memory 109 stores broadcast correction values LH` and LS` for M frames.

The correction value smoother 111 smoothes the correction values for M frames stored in the correction value memory 109. For example, when the highlight point when T-th frame of the frame image is input as LH _T, highlight points has been smoothed L'H _T, as shown in the following (4) equation, the values It is calculated as the average of However, in equation (4), d indicates the number of frames stored in the correction value memory 109. That is, if correction values for M frames are stored, d = M.

^{_{L'H T = (Σ T t}} = (Td) LH t) / d ... (4)
Similarly, the shadow point L'S _T smoothed, is determined by the following equation (5). Here again, d is the number of frames stored in the correction value memory 109.

^{_{L'S T = (Σ T t}} = (Td) LS t) / d ... (5)
Above the smoothed L'H _T, L'S _T via the selector 16 is inputted to the gamma corrector 18, a gamma curve as in the first embodiment described above is determined. For example, as shown in FIG. 2, a gamma curve corrected based on the corrected highlight point LH ′ and shadow point LS ′ is obtained as indicated by a one-dot chain line 52.

  Then, the image data is read from the frame memory 17, subjected to gamma correction according to the gamma curve indicated by the alternate long and short dash line 52, and displayed on the display panel 19.

  Next, a description will be given of a case where the input encoded data is not MPEG-2 encoded in the input code determination unit 104, that is, is non-broadcast content photographed by the user and is based on DV encoding.

  In this case, the output of the selector 105 is the DV decoder 106 side, the input of the selector 108 is the DV decoder 106 side, the output destination of the selector 11 is the correction value calculator 13 side, and the input destination of the selector 16 is the correction value smoothing. It is assumed that the generator 112 side.

  The DV encoded data input via the selector 105 is decoded by the DV decoder 106, and the decoded image data is input to the feature analyzer 10 and the frame memory 17 via the selector 108.

  The feature analyzer 10 creates a luminance histogram of the input image data, and, as in the first embodiment described above, the highlight point LH, which is a highlight correction point, and the shadow point LS, which is a shadow correction point. Is calculated as a reference correction value. The calculated reference correction value is input to the correction value calculator 13 via the selector 11.

  As in the first embodiment described above, the correction value calculator 13 calculates the highlight point LH` and the shadow point LS` corrected by the equation (2), and uses these as the non-broadcast system correction values as a correction value memory. Stored in 110. Here, in the correction value memory 110, broadcast correction values LH` and LS` for N frames are stored. The number N of non-broadcast frames has a relationship of N ≦ M with respect to the number M of broadcast frames.

The correction value smoother 112 smoothes the correction values for N frames stored in the correction value memory 110. For example, when the highlight point when T-th frame of the frame image is input to the LH _T, highlight point L'H _T which is smoothed, as shown in the following equation (6), respective values It is calculated as the average of In equation (6), d indicates the number of frames stored in the correction value memory 110. That is, if correction values for N frames are stored, d = N.

^{_{L'H T = (Σ T t}} = (Td) LH t) / d ... (6)
Similarly, the shadow point L'S _T smoothed, be determined by the following equation (7). Here again, d is the number of frames stored in the correction value memory 109.

^{_{L'S T = (Σ T t}} = (Td) LS t) / d ... (7)
Above the smoothed L'H _T, L'S _T via the selector 16 is inputted to the gamma corrector 18, a gamma curve as in the first embodiment described above is determined. For example, as shown in FIG. 2, a gamma curve corrected based on the corrected highlight point LH ′ and shadow point LS ′ is obtained as a thin line 53.

  Then, image data is read from the frame memory 17, subjected to gamma correction according to the gamma curve indicated by the thin line 53, and displayed on the display panel 19.

  A simple flow of the image display process in the image display apparatus according to the second embodiment described above will be described with reference to the flowchart of FIG. In FIG. 5, the same step numbers are assigned to the steps for performing the same processing as in FIG. 3 of the first embodiment described above, and the description thereof is omitted.

  First, in step S1, each unit is initialized, and in step S2, an end determination is performed.

  In step S101, the encoding method of the input encoded data is determined. If it is the MPEG-2 encoding method, the process proceeds to step S102, and if not, the process proceeds to step S105.

  In step S102, the input encoded data is decoded by the MPEG-2 encoding method to obtain image data. In step S103, as in step S4 in FIG. 3 of the first embodiment, feature analysis is performed on the image data input in the feature analyzer 10 to calculate a reference correction value.

  In step S6, the calculated reference correction value is corrected so as to be a broadcast correction value adapted to the broadcast content, and in step S104, an average of correction values for M frames is obtained. After smoothing, the process proceeds to step S8.

  On the other hand, in step S105, the input encoded data is decoded by the DV encoding method to obtain image data. In step S106, as in step S4 in FIG. 3 of the first embodiment, feature analysis is performed on the image data input in the feature analyzer 10 to calculate a reference correction value.

  In step S7, the calculated reference correction value is corrected so as to be a non-broadcast correction value adapted to non-broadcast content by user shooting. In step S107, the correction value for N frames is corrected. After smoothing by obtaining the average, the process proceeds to step S8.

  In step S8, the gamma corrector 18 corrects the image data using the corrected correction value. In step S9, the corrected image data is displayed, and the process returns to step S2 to process the next image data.

  As described above, according to the second embodiment, a broadcast-type image signal that has already been subjected to advanced correction processing for public broadcasting and an image taken by an individual user are not subjected to advanced correction processing. Appropriate correction is possible for each of the non-broadcast image signals. Therefore, the image quality of the displayed image can be improved in any image signal. In particular, for non-broadcast image signals, image quality can be suitably improved by performing correction more strongly than the broadcast system.

  Furthermore, by automatically determining the type of content based on the input encoded data, it is possible to save the user from having to make a determination.

  Further, by smoothing the correction values for a plurality of frames, it is possible to suitably suppress image fluctuations due to correction such as flicker. Furthermore, for broadcast signals with generally stable image quality, the processing speed can be increased by reducing the number of smoothing frames compared to non-broadcast signals.

  In the second embodiment, an example is shown in which whether or not the input encoded data is MPEG-2 encoding is determined by the first 4 bytes. However, depending on the multiplexing format, the encoding method is clearly indicated. May be used to determine the input code.

  Further, in the first and second embodiments described above, it is of course possible to configure each part or all functions of each embodiment by software and execute processing by an arithmetic device such as a CPU.

<Third Embodiment>
The third embodiment according to the present invention will be described below.

  FIG. 6 is a block diagram illustrating a configuration of the image display device according to the third embodiment. In FIG. 6, reference numeral 300 denotes a central processing unit (CPU) that controls the entire apparatus and performs various processes. Reference numeral 301 denotes a memory that provides an operating system (OS), software, and a storage area necessary for calculation necessary for controlling the apparatus. In addition to the area for storing the OS and software, the memory 301 stores an image area for storing image data, a code area for storing generated encoded data, parameters for various operations and encoding, data on watermarks, and the like. There is a working area to keep.

  A bus 302 connects various devices and exchanges data and control signals. A terminal 303 is used to start the apparatus, set various conditions, and issue a playback instruction. A storage device 304 stores software. Reference numeral 305 denotes a storage device that stores encoded data and image data as a stream. Note that the storage devices 304 and 305 may be configured with media that can be moved separately from the system.

  Reference numeral 306 denotes an image data input interface, which can input a plurality of types of image signals via signal lines shown below. For example, 310 is a signal line for inputting an image signal from the player 313 that plays the package media. Reference numeral 311 denotes a signal line for inputting an image signal from a camera 314 such as a camcorder. Reference numeral 312 denotes a signal line for inputting an image signal from a tuner 315 that receives a broadcast signal. Note that the number of signal lines and the types of connected external devices in the third embodiment are not limited.

  Reference numeral 307 denotes a monitor that displays an image. Reference numeral 309 denotes a communication line, which includes a LAN, a public line, a wireless line, a broadcast wave, and the like. A communication interface 308 transmits and receives a stream via the communication line 309.

  Hereinafter, an image display operation in the image display apparatus according to the third embodiment configured as described above will be described.

  Prior to the processing, the terminal 303 instructs the entire apparatus to start moving image display processing, and each unit is initialized. Then, various software stored in the storage device 304 is loaded into the memory 301 via the bus 302 and activated.

  Here, FIG. 7 shows a memory usage example in the memory 301. As shown in FIG. 7, the memory 301 first stores an OS for controlling the entire apparatus and operating various software. In addition, software for decoding MPEG-2 encoded data, code software for inputting encoded data, software for dodging correction, software for gamma correction, software for displaying image data, and the like are stored.

  As an initialization process at the time of activation, a working area on the memory 301 is secured with an area Pu for storing correction values related to content photographed by the user and an area Pb for storing correction values related to broadcast-type content.

  Similarly, an area C for storing one frame of encoded data input from the input interface 306 is secured in the code area of the memory 301. In the image area, an area IM1 for storing a frame image one frame before work, an area IM2 for storing an output frame image, and an area S for storing an area determination result are secured.

  When the encoded data input software on the memory 301 is activated, the encoded data is input frame by frame from the input interface 306 and stored in the area C on the code area. Thereafter, the encoded data input software sequentially inputs and stores the encoded data in units of frames.

  For ease of explanation, it is assumed that only the signal line 310 is connected to the input interface 306 and the encoded data stored in the player 313 is based on the MPEG-2 encoding method. Of course, the third embodiment is not limited to this example.

  In the MPEG-2 encoding method, information indicating what kind of content the encoded data is stored in the user data area as meta information. It is assumed that the encoded data in the third embodiment is any one of movie content, recorded content obtained by recording a broadcast, and captured content taken by a user.

  When the image display software is activated and the frame image data is stored in IM2 on the image area, the image is displayed on the monitor 307. Thereafter, the image display software sequentially displays the stored frame images.

  Then, the gamma correction software is activated, and the image display process in the third embodiment is executed under the control of the CPU 300.

  Hereinafter, image display processing in the third embodiment will be described with reference to the flowchart of FIG.

  First, in step S301, each memory area is cleared to 0 and initialized.

  In step S302, if the end of the program is instructed from the terminal 303, for example, each unit is cleared, the secured area is released, and the process ends. Otherwise, the process proceeds to step S303.

  In step S <b> 303, encoded data for one frame is stored in the code area C on the memory 301 by the encoded data input software.

  In step S304, the user data area is read from the encoded data stored in the code area C, and it is determined from the meta information whether the encoded data is movie content, recorded content, or captured content. judge. This determination result is stored in the working area on the memory 301 as mode m.

  In step S305, the encoded data stored in the code area C is decoded by the MPEG-2 decoding software and stored in the area IM1 in the image area on the memory 301.

  In step S306, the reference correction value is calculated from the image data of the region IM1 by the same method as in step S4 of the first embodiment described above.

  In step S307, the mode m in the working area on the memory 301 is read, and it is determined whether or not the input encoded data is movie content. If it is a movie content, the process proceeds to step S308; otherwise, the process proceeds to step S309.

  In step S308, the contents of the area IM1 in the image area on the memory 301 are moved to the area IM2, and the process proceeds to step S314.

  In step S309, the mode m in the working area on the memory 301 is read out, and it is determined whether or not the input encoded data is photographed content. If it is a photographed content, the process proceeds to step S310; otherwise, the process proceeds to step S312.

  In step S310, the reference correction value calculated in step S306 is corrected to be a non-broadcast correction value adapted to the content photographed by the user by the same method as in step S7 of the first embodiment described above. . Then, the corrected correction value is stored in the correction value area Pu of the non-broadcast content on the working area. In step S311, based on the correction value stored in the correction value area Pu, the image data stored in the area IM1 of the image area is corrected and stored in the area IM2. Then, the process proceeds to step S314.

  On the other hand, in step S312, the reference correction value calculated in step S306 is corrected to the broadcast correction value adapted to the broadcast content by the same method as in step S6 of the first embodiment described above. Then, the corrected correction value is stored in the correction value area Pb of the broadcast content on the working area. In step S313, based on the correction value stored in the correction value area Pb, the image data stored in the area IM1 of the image area is corrected and stored in the area IM2, and then the process proceeds to step S314.

  In step S314, the image data of the area IM2 in the image area on the memory 301 is displayed on the monitor 307, and the process returns to step S302 to process the next image data. When the end of processing is instructed from the terminal 303, all software is stopped.

  As described above, according to the third embodiment, optimal correction can be performed for each content according to the type of content to be displayed. That is, correction is not performed for movie content that has already been subjected to sufficient correction processing and should not be corrected any further. In addition, for the recorded content recorded on the broadcast that has been subjected to the advanced correction processing and the captured content that was shot by an individual user and would not have been subjected to the advanced correction processing, particularly the latter is strongly corrected. Thus, each image quality can be improved appropriately.

  In the third embodiment, the input encoded data is displayed on the monitor 307. However, the communication software may be activated and the image data in the image area may be stored in the storage device 305. Furthermore, it is of course possible to transmit to the communication line 309 via the communication interface 308.

  Furthermore, it is also effective to perform backlight correction or the like by operating the dodging correction software only for the content captured by the user.

<Fourth embodiment>
The fourth embodiment according to the present invention will be described below. The configuration of the image display device in the fourth embodiment is the same as that in the third embodiment described above. In the third embodiment described above, the case where only the signal line 310 is connected to the input interface has been described as an example. However, in the fourth embodiment, all the signal lines 310, 311, and 312 are connected to the input interface 306. It is characterized by.

  Hereinafter, an image display operation in the image display apparatus according to the fourth embodiment will be described.

  First, as an initial process, in a working area on the memory 301, an area Pu for storing correction values for photographed content shot by a user, an area Pb for storing correction values for broadcast-related content, and further correction for movie content. An area Pc for storing values is secured. Similarly to the third embodiment, the area IM1 and the area IM2 are secured in the image area.

  Here, FIG. 9 shows an example of memory usage in the memory 301, but the description of the same contents as in FIG. 7 of the third embodiment will be omitted. As shown in FIG. 9, the memory 301 of the fourth embodiment stores image input software for inputting image data from the signal line of the external device designated by the terminal 303. In addition, device communication software for communicating with the external device via the signal line of the external device instructed by the terminal 303 and acquiring the characteristics of the device is stored.

  In the fourth embodiment, when the image display device is activated, the user selects any one of the player 313, the camera 314, and the tuner 315 as an external device for inputting content to be displayed using the terminal 303.

  Then, the device communication software on the memory 301 is activated and information on the external device is acquired. For example, if the player 313 is selected as the external device, information indicating that the player 313 is a package media playback device is acquired by performing the above-described communication. Further, if the external device is the camera 314, information that is different from broadcasting and that is a device that outputs photographed content photographed by the user is acquired. Further, if the external device is the tuner 315, information indicating that the device is a device that outputs image data related to broadcasting is acquired.

  When the image data input software on the memory 301 is activated, image data is input frame by frame from the input interface 306 and stored in the area IM1 on the image area. Thereafter, the image data input software sequentially inputs the frame images and stores them in the area IM1.

  Further, as in the third embodiment, when the image display software is activated and the frame image data is stored in IM2 on the image area, the image is displayed on the monitor 307. Thereafter, the image display software sequentially displays the stored frame images.

  Then, the gamma correction software is activated, and the image display process in the fourth embodiment is executed under the control of the CPU 300.

  Hereinafter, image display processing in the fourth embodiment will be described with reference to the flowchart of FIG. In FIG. 10, the same step numbers are assigned to the steps for performing the same processing as in FIG. 8 of the third embodiment described above, and the description thereof is omitted.

  First, in step S301, each memory area is cleared to 0 and initialized.

In step S401, external device information is acquired by the device communication software and stored as device information m in the working area on the memory 301. For example, “1” indicates that the device is a packaged media playback device, “2” indicates that the device is a device that plays back captured content by the user, and “3” indicates that the device is a device that plays content related to broadcasting. In step S302, if the termination of the program is instructed from the terminal 303 or the like, the respective units are cleared, the reserved area is released, and the process is terminated. . Otherwise, the process proceeds to step S402.

  In step S <b> 402, image data for one frame is stored in the area IM <b> 1 in the image area on the memory 301 by the image data input software.

  In step S306, a reference correction value is calculated based on the image data stored in the area IM1.

  In step S403, it is determined whether the value of the device information m is “1”, that is, whether the device is a package media playback device. If it is a packaged media playback device, the image data is package data and the movie content is included in the image data, and the process proceeds to step S404. Otherwise, the process proceeds to step S406.

  In step S404, the calculated reference correction value is corrected so as to be a package correction value adapted to the movie content. That is, for the movie content, the correction value is calculated so that the high-luminance portion is reduced and the gradation at the low luminance is ensured as compared with the content for television broadcasting. The corrected correction value is stored in the area Pc. In step S405, based on the correction value stored in the correction value area Pc, the image data stored in the area IM1 in the image area is corrected and stored in the area IM2. Then, the process proceeds to step S314.

  On the other hand, in step S406, it is determined whether or not the value of the device information m is “2”, that is, whether or not the device is a device for reproducing photographed content. If it is a playback device for photographed content, it proceeds to step S310 on the assumption that content requiring strong correction is included, and otherwise proceeds to step S312.

  In step S310, as in the third embodiment, the reference correction value calculated in step S306 is corrected in accordance with the captured content. In step S311, the image data stored in the area IM1 in the image area is corrected based on the correction value stored in the correction value area Pu, and after this is stored in the area IM2, the process proceeds to step S314.

  On the other hand, in step S312, similarly to the third embodiment, the reference correction value calculated in step S306 is corrected in accordance with the broadcast content. In step S313, based on the correction value stored in the correction value area Pb, the image data stored in the area IM1 in the image area is corrected and stored in the area IM2. Then, the process proceeds to step S314.

  In step S314, the image data of the area IM2 in the image area on the memory 301 is displayed on the monitor 307, and the process returns to step S302 to process the next image data. When the terminal 303 is instructed to end the process, all software is stopped.

  As described above, according to the fourth embodiment, the optimum type for each content is determined by determining the type of content input as a display target based on information from an image playback device connected as an external device. Corrections can be made. In other words, appropriate correction corresponding to various video sources is possible.

  In the third and fourth embodiments, examples in which the image display processing is realized by software have been described. However, it is of course possible to configure each part or all functions in these embodiments by hardware.

<Other embodiments>
Although the embodiment has been described in detail above, the present invention can take an embodiment as a system, apparatus, method, program, recording medium (storage medium), or the like. Specifically, the present invention may be applied to a system composed of a plurality of devices (for example, a host computer, an interface device, an imaging device, a web application, etc.), or may be applied to a device composed of a single device. good.

  In the present invention, a software program for realizing the functions of the above-described embodiments is supplied directly or remotely to a system or apparatus, and the computer of the system or apparatus reads and executes the supplied program code. Is also achieved. The program in this case is a computer-readable program that corresponds to the flowchart shown in the drawing in the embodiment.

  Accordingly, since the functions of the present invention are implemented by computer, the program code installed in the computer also implements the present invention. In other words, the present invention includes a computer program itself for realizing the functional processing of the present invention.

  In this case, as long as it has a program function, it may be in the form of object code, a program executed by an interpreter, script data supplied to the OS, or the like.

  Recording media for supplying the program include the following media. For example, floppy disk, hard disk, optical disk, magneto-optical disk, MO, CD-ROM, CD-R, CD-RW, magnetic tape, nonvolatile memory card, ROM, DVD (DVD-ROM, DVD- R).

  As a program supply method, the following method is also possible. That is, the browser of the client computer is connected to a home page on the Internet, and the computer program itself (or a compressed file including an automatic installation function) is downloaded from the browser to a recording medium such as a hard disk. It can also be realized by dividing the program code constituting the program of the present invention into a plurality of files and downloading each file from a different homepage. That is, a WWW server that allows a plurality of users to download a program file for realizing the functional processing of the present invention on a computer is also included in the present invention.

  In addition, the program of the present invention is encrypted, stored in a storage medium such as a CD-ROM, distributed to users, and key information for decryption is downloaded from a homepage via the Internet to users who have cleared predetermined conditions. It is also possible to make it. That is, the user can execute the encrypted program by using the key information and install it on the computer.

  Further, the functions of the above-described embodiments are realized by the computer executing the read program. Furthermore, based on the instructions of the program, an OS or the like running on the computer performs part or all of the actual processing, and the functions of the above-described embodiments can also be realized by the processing.

  Further, the program read from the recording medium is written in a memory provided in a function expansion board inserted into the computer or a function expansion unit connected to the computer, and then executed, so that the program of the above-described embodiment can be obtained. Function is realized. That is, based on the instructions of the program, the CPU provided in the function expansion board or function expansion unit can perform part or all of the actual processing.

It is a block diagram which shows the structure of the image display system in one Embodiment which concerns on this invention. It is a figure which shows an example of the gamma curve as a correction value in this embodiment. It is a flowchart which shows the image display process in this embodiment. It is a block diagram which shows the structure of the image display apparatus in 2nd Embodiment. It is a flowchart which shows the image display process in 2nd Embodiment. It is a block diagram which shows the structure of the image display system in 3rd Embodiment. It is a figure which shows the usage example of the memory in 3rd Embodiment. It is a flowchart which shows the image display process in 3rd Embodiment. It is a figure which shows the usage example of the memory in 4th Embodiment. It is a flowchart which shows the image display process in 4th Embodiment. It is a figure which shows an example of the conventional image correction method.

Claims (12)

Input means for inputting moving image data;
Determination means for determining the content of correction already applied to the moving image data based on the attribute of the moving image data;
Correction means for correcting the moving image data in accordance with a determination result in the determination means;
Display means for displaying moving image data corrected by the correction means;
An image display device comprising:   2. The determination unit according to claim 1, wherein the determination unit determines whether the moving image data is broadcast data obtained by receiving a public broadcast or other non-broadcast data. The image display device described.   The correction means corrects the moving image data when the image data is determined to be the non-broadcasting data when compared with the case where the moving image data is determined to be the broadcast data. The image display device according to claim 2, wherein the strength of the image display device is increased.   4. The image display device according to claim 2, wherein the determination unit further determines whether the moving image data is package data obtained by playing a package medium.   The image display apparatus according to claim 4, wherein the correction unit does not perform correction on the moving image data when the determination unit determines that the image data is the package data. . The input means has a plurality of terminals,
The image display device according to claim 1, wherein the determination unit determines the content of correction based on a terminal to which the moving image data is input by the input unit. The input means inputs encoded video data,
The image display apparatus according to claim 1, wherein the determination unit determines a correction content based on an encoding method of the moving image data.   The image display apparatus according to claim 1, wherein the determination unit determines a correction content based on meta information of the moving image data. The input means inputs moving image data from a connected external device,
The image display device according to claim 1, wherein the determination unit determines a correction content based on device information of the external device. An input step in which the input means inputs moving image data;
A determination step for determining, based on the attribute of the moving image data, the content of the correction that has already been performed on the moving image data;
A correcting step for correcting the moving image data according to the determination result of the determining step;
A display step for displaying the moving image data corrected by the correction step;
An image display method characterized by comprising:   A computer program that, when executed on a computer, causes the computer to function as the image display device according to any one of claims 1 to 9.   A computer-readable recording medium having the computer program according to claim 11 recorded thereon.

Images