JP6167524B2 - Projector and video data processing method - Google Patents

Description

  The present invention relates to a projector and a video data processing method.

  The image projected on the projection plane by the projector may be distorted into a non-rectangular image such as a trapezoid if the projector has an elevation angle or depression angle with respect to the projection plane when the projector is installed. Keystone correction is to electronically correct non-rectangular distortion of an image projected on a projection plane. In the technique described in Patent Literature 1, the deformation processing unit deforms a rectangular video area into a non-rectangular video area. Then, the identification processing unit identifies whether or not each pixel data of the transformed image belongs to the video area, and outputs the identification result as a control signal. The replacement control unit repeats the passing and replacement control for each pixel data based on the control signal from the identification processing unit.

JP 2005-39593 A

  However, the video output by the projector after performing video data processing such as keystone correction can be output outside the effective video area, that is, around the video projected on the projection plane, even using the technique described in Patent Document 1. To which an area not including an effective video is added. For this reason, the amount of data transferred to the memory (DRAM) provided in the projector by video data processing increases, and there is a problem that the bandwidth of the memory is compressed.

  The present invention has been made in view of the above points, and an object thereof is to provide a projector and a video data processing method capable of reducing the amount of data transferred to a DRAM in video data processing.

  SUMMARY An advantage of some aspects of the invention is that an input unit that acquires video data and a keystone correction are performed on the video data acquired by the input unit. A keystone processing unit that generates effective video information representing an effective video area that is a rectangular area when projected onto the projection plane in the correction result, and the effective video area in the correction result based on the effective video information. An effective video area processing unit that processes video data.

  With the above configuration, the keystone processing unit performs keystone correction on the video data acquired by the input unit, and generates effective video information indicating the effective video region in the corrected video, so that the effective video region processing unit Since the video data processing can be performed on the video data in the effective video area indicated by the effective video information, the amount of data transferred to the storage unit (DRAM) can be reduced.

  One aspect of the present invention further includes a storage unit in which video data to be processed is stored by the effective video area processing unit, and the effective video area processing unit is configured to generate the effective video based on the effective video information. An image data of a region is selectively stored in the storage unit.

  With the above configuration, the effective video area processing unit can selectively store the video data of the effective video area in the storage unit, so that the access amount of the storage area can be reduced.

  In one aspect of the present invention, the keystone processing unit uses the table including information indicating a position of a start point of the effective image area of each line and information indicating a position of an end point. The projector is characterized in that the effective video information is transmitted to an area processing unit.

  With the above configuration, an effective video information table is generated by associating the line number for identifying the line, the start point coordinates of the effective video area of the video in the correction result, and the data amount up to the end point of the effective video area. Since the video area processing unit can perform video data processing only on the effective video area in the video corrected by the keystone processing unit, the amount of data transferred to the storage unit (DRAM) can be reduced.

  In one aspect of the present invention, the keystone processing unit is a signal synchronized with video data, and uses the effective video signal indicating whether each pixel belongs to the effective video area. The projector is characterized in that the effective video information is transmitted to an area processing unit.

  With the above configuration, the keystone processing unit can generate an effective video signal with reference to the effective video information stored in the storage unit, and the effective video area processing unit can generate an image for the effective video area indicated by the effective video signal. Since data processing can be performed, the amount of data transferred to the storage unit (DRAM) can be reduced.

  According to another aspect of the present invention, the effective video area processing unit performs frame rate conversion on the video data of the effective video area indicated by the effective video information in the correction result. is there.

  With the above configuration, since the effective video area processing unit can perform frame rate conversion only on the effective video signal or the video data of the effective video area indicated by the effective video information table, data to be transferred to the storage unit (DRAM). The amount can be reduced.

  In one aspect of the invention, the effective video area processing unit performs overdrive processing on video data in the effective video area indicated by the effective video information in the correction result. It is.

  With the above configuration, the effective video area processing unit can perform overdrive processing only on the effective video signal or the video data in the effective video area indicated by the effective video information table, and transfers the data to the storage unit (DRAM). Data volume can be reduced.

  One embodiment of the present invention is an input process for acquiring video data, and a region that is rectangular when the keystone correction is performed on the video data acquired in the input process and the correction result is projected onto a projection plane. A keystone process for generating valid video information representing a valid video area; an effective video area process for processing video data of the valid video area in the correction result based on the valid video information; A video data processing method characterized by comprising:

  With the above configuration, effective video information indicating the effective video area can be generated from the video data acquired in the input process, and video data processing can be performed on the video data in the effective video area indicated by the effective video information. ) Can be reduced.

  As described above, according to the present invention, the amount of data transferred to the DRAM can be reduced by adding effective video information indicating an effective video area in video data processing.

It is a conceptual diagram which shows an example of the use scene of the projector which concerns on one Embodiment of this invention. It is a schematic block diagram which shows an example of a structure of the projector which concerns on this embodiment. It is a schematic block diagram which shows an example of a structure of the keystone process part of the projector which concerns on this embodiment. It is an image explaining an example of the production | generation process of the effective video information in the production | generation part of the keystone process part of the projector which concerns on this embodiment. It is an effective video information table which shows an example of the effective video information which the keystone process part of the projector which concerns on this embodiment produces | generates. It is a timing chart which shows an example of the relationship between the horizontal synchronizing signal in the keystone process part of the video data processing part of the projector which concerns on this embodiment, video data, and an effective video signal. It is an image which shows an example of the output image | video after the keystone process which concerns on the comparative example of one Embodiment of this invention.

(Comparative example)
Before describing an embodiment of the present invention, a comparative example of an embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 7 is an image G1 showing an example of an output video after keystone processing (correction) according to a comparative example of one embodiment of the present invention.
When a projector projects an image on a projection surface, for example, a screen, the projected image may be distorted into a non-rectangular image such as a trapezoid if the projector has an elevation angle or depression angle with respect to the projection surface. Keystone correction is to electronically correct non-rectangular distortion of an image projected on a projection plane.

When the output image of the projector after the keystone correction is projected onto the projection surface, for example, an area that is rectangular when projected onto the projection surface (hereinafter referred to as an effective image) as in the image G1, and the effective image area. , An image including a region outside the rectangle (hereinafter referred to as an ineffective image). In the output video, a region G11 including an effective video (hereinafter referred to as an effective video region) is a non-rectangular region, but only the effective video region is projected in a rectangular shape or a shape close to a rectangle on the projection surface. The ineffective image area G12 (hereinafter referred to as an ineffective image area) is generally a black image so that nothing is displayed on the projection surface.
In the projector, the video data processing unit performs various types of video data processing from the line L1 to the line LN in order in the output video, and generates a video to be projected on the projection plane (hereinafter, “projected video”). The video data processing unit writes or reads image data including an effective video area and an ineffective video area in a storage unit (DRAM) for each type of video data processing.

(One embodiment)
Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a conceptual diagram showing an example of a usage scene SY1 of the projector 1 according to this embodiment. In the usage scene SY1, the projector 1 projects the projection video G2 onto the projection surface 2, for example, the screen. The viewer H1 views the projection video G2 projected on the projection plane 2. At this time, if the projector 1 is installed at a position that does not face the projection surface 2, the projector 1 needs to perform a keystone process to be described later in order to project the projection image G2 into a rectangle.

FIG. 2 is a schematic block diagram illustrating an example of the configuration of the projector 1 according to the present embodiment.
The projector 1 includes an operation unit 10, an input unit 11, a control unit 12, a video data processing unit 13, a DRAM 14, and a projection unit 15. Although the projector 1 has other general projector functions, illustration and description thereof are omitted.
The operation unit 10 receives various operations from the user. For example, the operation unit 10 accepts operations related to power on / off, operations related to selection of video data input to the input unit 11, and the like. The operation unit 10 outputs an operation signal corresponding to the operation received from the user to the control unit 12.

The input unit 11 acquires information from outside the projector 1 under the control of the control unit 12. For example, the input unit 11 acquires video data of a projected video projected on the projection plane 2 illustrated in FIG. 1 from the outside. The input unit 11 outputs video data acquired from the outside to the video data processing unit 13.
The control unit 12 includes a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), and the like, and controls the entire projector 1. The control unit 12 performs control to acquire video data from the input unit 11 in accordance with the operation signal input from the operation unit 10. The control unit 12 controls the video data processing unit 13 to output the video data acquired by the input unit 11 and perform video data processing on the video data. The control unit 12 controls the projection unit 15 to project the video data processed by the video data processing unit. The control unit 12 outputs a control signal according to the control.

  The video data processing unit 13 performs video data processing on the video data input from the input unit 11 based on the control signal input from the control unit 12. Specifically, the video data processing unit 13 adjusts the size of the video data input from the input unit 11. Thereafter, the video data processing unit 13 superimposes an OSD (On Screen Display) image on the video data. The video data processing unit 13 performs keystone correction (keystone correction) on the video data. The video data processing unit 13 converts the frame rate of the corrected video data. Then, the video data processing unit 13 performs overdrive processing on the video data after the frame rate conversion. A detailed description of the video data processing unit 13 will be described later.

The DRAM 14 is a storage unit that stores video data output from the video data processing unit 13, and stores video data to be processed when the video data processing unit 13 performs the various processes described above.
The projection unit 15 includes a discharge lamp, a liquid crystal panel, a spectroscopic element, a polarizing element, a projection lens, and the like, and projects the video data input from the video data processing unit 13 onto the projection plane 2.

  The video data processing unit 13 includes a resizing unit 131, an OSD unit 132, a keystone processing unit 133, a DRAM I / F unit 136, and an effective video area processing unit 16. The effective video area processing unit 16 includes a frame rate conversion unit 134 and an overdrive unit 135.

  The resizing unit 131 stores the video data input from the input unit 11 in the DRAM 14 via the DRAM I / F unit 136. The resizing unit 131 adjusts the size of the video data by matching the resolution of the video data stored in the DRAM 14 with the number of pixels of the liquid crystal panel included in the projection unit 15 of the projector 1. Specifically, the resize unit 131 adjusts the resolution by thinning out the pixels (interpolating the pixels) when video data larger (smaller) than the number of pixels of the liquid crystal panel included in the projection unit 15 is input. Optimization is performed for each video data. The resizing unit 131 outputs the optimized and resolution-adjusted video data to the OSD unit 132.

  The OSD unit 132 stores the video data input from the resizing unit 131 in the DRAM 14 via the DRAM I / F 136. The OSD unit 132 performs processing for overlaying an OSD image such as a menu screen on the video data stored in the DRAM 14 as necessary. The OSD unit 132 outputs the video data on which the OSD image is superimposed to the keystone processing unit 133.

  The keystone processing unit 133 stores the video data input from the OSD unit 132 in the DRAM 14 via the DRAM I / F unit 136. The keystone processing unit 133 performs keystone correction (keystone correction) on the video data stored in the DRAM 14 to generate video data VS1. The keystone processing unit 133 determines the effective video area of the video data VS1 subjected to the keystone correction for each line, and based on the determination result indicating the effective video area, for example, effective video information indicating the effective video area, for example, the effective video area An effective video information table is generated in which the start point coordinates and the effective video data amount from the start point to the end point of the effective video area are associated with each other. The keystone processing unit 133 stores the generated effective video information table in the RAM provided in the control unit 12.

The keystone processing unit 133 generates an effective video signal PS for each line with reference to the generated effective video information table. The keystone processing unit 133 outputs the generated valid video signal PS and the keystone corrected video data VS1 to the frame rate conversion unit 134. The detailed operation of the keystone processing unit 133 will be described later.
The keystone processing unit 133 outputs the valid video signal PS to the frame rate conversion unit 134, but may output the valid video information table to the frame rate conversion unit 134 as it is.

The frame rate conversion unit 134 converts the video data in the effective video area indicated by the effective video signal PS for each line into a frame rate that does not cause flicker of the liquid crystal panel.
Specifically, when the video data VS1 and the valid video signal PS are input from the keystone processing unit 133, the frame rate conversion unit 134 converts the video data VS1 in the valid video area indicated by the valid video signal PS to the DRAM I / F. The data is stored in the DRAM 14 via the unit 136. The frame rate conversion unit 134 converts the video data VS1 stored in the DRAM 14 into a predetermined frame rate such as 120 Hz or 240 Hz, and generates video data VS2. At this time, the frame rate conversion unit 134 refers to the effective video signal PS and performs frame rate conversion on only the video data VS1 in the effective video area among the video data VS1 stored in the DRAM 14. The frame rate conversion unit 134 outputs the converted video data VS2 and the effective video signal PS to the overdrive unit 135.

The overdrive unit 135 detects the amount of change between the previous frame and the frame of the video data VS2 input from the frame rate conversion unit 134 using a known technique.
The overdrive unit 135 changes the video data VS2 of the effective video area so as to increase the response speed of the liquid crystal panel included in the projection unit 15 based on the detected change amount, and the video data resulting from the change is stored in the DRAM I / F unit 136. Is stored in the DRAM 14 via At this time, the overdrive unit 135 refers to the valid video signal PS, and detects the change amount and writes the change result to the DRAM 14 for the video data in the valid video area. Note that the change result stored in the DRAM 14 via the DRAM I / F unit 136 is read from the DRAM 14 via the DRAM I / F unit 136 as video data of the previous frame in the process for the next frame.

  Specifically, the overdrive unit 135 increases the response time of the display by reducing the voltage when the liquid crystal panel expresses gradation based on the detected amount of change to a high level at the time of rising and low at the time of falling. The video data in the effective video area is changed so as to shorten it. The overdrive unit 135 outputs the video data subjected to the overdrive process to the projection unit 15.

  The overdrive unit 135 outputs the input video data as it is when the valid video signal PS is changed in the keystone processing unit 133.

FIG. 3 is a schematic block diagram illustrating an example of the configuration of the keystone processing unit 133 of the projector 1 according to the present embodiment.
The keystone processing unit 133 is a processing unit 1331 that performs keystone correction on the video data input from the OSD unit 132 illustrated in FIG. 2, and a determination unit that determines the presence or absence of an effective video region from the keystone corrected video data. 1332 and a generation unit 1333 that generates effective video information based on a determination result indicating the presence or absence of an effective video area, and generates an effective video signal PS with reference to the effective video information.

  The processing unit 1331 stores the video data input from the OSD unit 132 in the DRAM 14 via the DRAM I / F unit 136. The processing unit 1331 performs keystone correction on the video data read from the DRAM 14 via the DRAM I / F unit 136. The processing unit 1331 stores the video data VS1 subjected to keystone correction in the DRAM 14 via the DRAM I / F unit 136. The processing unit 1331 outputs the keystone-corrected video data VS1 to the frame rate conversion unit 134 and the determination unit 1332.

  The determination unit 1332 determines whether or not an effective video area is included for each line of the video data VS1 with respect to the video data VS1 subjected to keystone correction input from the processing unit 1331. When the effective video area is included, the determination unit 1332 outputs an effective video content signal indicating that the effective video area is included to the generation unit 1333. On the other hand, when the effective video area is not included, the determination unit 1332 outputs a non-effective video area signal indicating that only the non-effective video area exists to the generation unit 1333.

  The generation unit 1333 reads out the video data VS1 subjected to keystone correction from the DRAM 14 via the DRAM I / F unit 136. The generation unit 1333 generates effective video information indicating an effective video area based on the read video data VS1 and the effective video content signal or the non-effective video area signal input from the determination unit 1332. The generation unit 1333 stores the generated effective video information in the DRAM 14 via the DRAM I / F unit 136. The generation unit 1333 generates an effective video signal PS for each line with reference to the generated effective video information. The generation unit 1333 outputs the generated effective video signal PS to the frame rate conversion unit 134. The operation of the generation unit 1333 will be described in detail with reference to FIG.

  FIG. 4 is an image for explaining an example of generation processing of effective video information by the generation unit 1333 of the keystone processing unit 133 of the projector 1 according to the present embodiment.

  When the valid video content signal of the line LE1 is input from the determination unit 1332, the generation unit 1333 extracts the start point coordinates of the valid video region G11 from the output video G1 on the line LE1. The generation unit 1333 extracts the effective video data amount from the start point coordinates of the effective video region of the extracted line LE1, that is, the effective video data amount from the effective point to the end point of the effective video region in the line LE1. The effective image information of the line LE1 is generated by associating the line number for identifying the line with the start point coordinates, the start point coordinates, and the data amount of the effective image.

Then, the generation unit 1333 extracts effective video information from other lines, that is, from the line LE2 to the line LEN, by extracting the start point coordinates of the effective video area in the same manner as the line LE1.
Here, the length A of each line is 1920 pixels, for example. The number of lines is N. For example, in the n-th line LEn, if the start point coordinate (X coordinate) of the effective video area is Xn = 400, the length B of the non-effective video area is calculated as 400 pixels from 0 to 399. If the effective video data amount, that is, the length C of the effective video area is 1000 pixels, the generation unit 1333 indicates that the effective video area in the nth line LEn is 1000 pixels from 400 to 1399. Generate video information. The generation unit 1333 generates an effective video signal PS for each line with reference to the generated effective video information, and outputs the generated effective video signal PS to the frame rate conversion unit 134 illustrated in FIG.

Note that the generation unit 1333 can derive the end point coordinate based on the effective video data amount if the start point coordinate is known, and therefore the effective video data amount corresponds to information indicating the end point of the effective video region. The generation unit 1333 may use the end point coordinates of the effective video area instead of the effective video data amount.
When a non-effective video area signal is input from the determination unit 1332, the generation unit 1333 generates effective video information for the next line without extracting the start point coordinates of the effective video area in the line.

FIG. 5 is a table T1 showing an example of effective video information generated by the generation unit 1333 of the keystone processing unit 133 of the projector 1 according to the present embodiment.
The table T1 has an item string of a line number for identifying a line, an effective area start coordinate indicating the start point coordinate of the effective video area, and a data amount of the effective video area (information indicating the end point position of the effective video area). ing.
Each line number is associated with an effective video area start coordinate and an effective video area data amount. The line number “LE1” is associated with the start coordinate “X1” of the effective video area and the data amount “E1” of the effective video area. The line number “LE2” is associated with the start coordinate “X2” of the effective video area and the data amount “E2” of the effective video area. The line number “LEn” is associated with the start coordinate “Xn” of the effective video area and the data amount “En” of the effective video area.

FIG. 6 is a timing chart showing an example of the relationship among the horizontal synchronization signal S1, the video data VS1, and the effective video signal PS output from the keystone processing unit 133 of the video data processing unit 13 of the projector 1 according to the present embodiment. It is.
When the keystone processing unit 133 outputs the video data VS1 of the nth line LEn and the effective video signal PS for each line generated by referring to the effective video information to the frame rate conversion unit 134, the keystone processing unit 133 outputs the horizontal synchronization signal S1. The video data VS1 and the effective video signal PS are synchronized. A time A1 from time t1 to time t2 at which the video data VS1 is output corresponds to the line length A shown in FIG. Further, the output time B1 of the non-effective video area in the effective video signal PS is calculated from the length B to the start point coordinates of the effective video area in the nth line LEn. Further, the time C1 corresponding to the line length C of the effective video area is calculated based on the effective video data amount En.

  When the frame rate conversion unit 134 stores the video data input from the keystone processing unit 133 in the DRAM 14, the length B of the ineffective video area indicated by the effective video signal PS of the nth line LEn from time t1. Until the time B1 corresponding to is reached, the video data is not output (not stored in the DRAM 14). Then, the frame rate conversion unit 134 outputs the video data of the effective video area to the DRAM 14 until the time C1 corresponding to the length C (FIG. 4) of the effective video area indicated by the effective video signal PS of the nth line LEn is reached. To do. Subsequently, the frame rate conversion unit 134 does not output video data for the time until time t2. That is, the frame rate conversion unit 134 selectively stores only the video data in the effective video area in the DRAM 14 based on the effective video signal PS. Note that the frame rate conversion unit 134 outputs data representing black when outputting the video data in the ineffective video region when outputting the processed video data to the overdrive unit 135.

  The video data VS2 and the effective video signal PS output from the frame rate conversion unit 134 are the same signals as the video data VS1 and the effective video signal PS, although the frame rates are different. Then, similarly to the frame rate conversion unit 134, the overdrive unit 135 also selectively stores only video data in the effective video area in the DRAM 14 based on the effective video signal PS. The overdrive unit 135 outputs black data when outputting the video data of the ineffective video region when outputting the processed video data to the projection unit 15.

  As described above, in the present embodiment, the projector 1 performs the keystone correction on the video data acquired by the input unit 11 that acquires the video data, and projects it on the projection plane in the correction result. A keystone processing unit 133 that generates effective video information representing an effective video area that is a rectangular area, and an effective video area process that processes the video data of the effective video area in the correction result based on the effective video information Unit 16 (frame rate conversion unit 134 and overdrive unit 135).

  As a result, the keystone processing unit 133 performs keystone correction on the video data acquired by the input unit 11, and generates effective video information indicating the effective video region in the corrected video data. Since the video data can be processed for the video data in the effective video area indicated by the effective video information in the unit 16, it is not necessary to store the video data in the non-effective video area in the storage unit (DRAM 14), and the storage unit (DRAM 14). Can reduce the amount of data transferred.

  In this embodiment, the projector 1 further includes a storage unit (DRAM 14) in which video data to be processed is stored by the effective video area processing unit 16 (the frame rate conversion unit 134 and the overdrive unit 135). The area processing unit 16 (the frame rate conversion unit 134 and the overdrive unit 135) selectively stores the video data of the effective video area in the storage unit (DRAM 14) based on the effective video information.

  Accordingly, the effective video area processing unit 16 (the frame rate conversion unit 134 and the overdrive unit 135) can selectively store the video data of the effective video area in the storage unit (DRAM 14). ) Access amount to the storage area can be reduced.

  In this embodiment, the keystone processing unit 133 also includes information (start point coordinates) indicating the position of the start point of the effective video area of each line, and information indicating the position of the end point (data from the start point to the end point of the effective video area). The effective image information is transmitted to the effective image area processing unit 16 using the table T1 including the amount).

  Thereby, by generating a valid video information table that associates the line number for identifying the line, the start point coordinates of the valid video region of the video in the correction result, and the data amount from the start point to the end point of the valid video region, Since the effective image area processing unit 16 can perform image data processing only on the effective image area in the image corrected by the keystone processing unit 133, the amount of data transferred to the storage unit (DRAM 14) can be reduced.

  Further, in the present embodiment, the keystone processing unit 133 is a signal synchronized with the video data and uses an effective video signal indicating whether or not each pixel belongs to the effective video region. 16 transmits effective video information.

  As a result, the keystone processing unit 133 can generate an effective video signal, and the effective video area processing unit 16 can perform video data processing on the effective video area indicated by the effective video signal, so that it is stored in the storage unit (DRAM 14). The amount of data to be transferred can be reduced.

  In the present embodiment, the effective video area processing unit 16 performs frame rate conversion on the video data in the effective video area indicated by the effective video information in the correction result.

  As a result, the effective video area processing unit 16 can perform frame rate conversion only on the effective video signal PS or the video data in the effective video area indicated by the effective video information table T1, and therefore, the effective video area processing unit 16 transfers the frame rate to the storage unit (DRAM 14). Data volume to be reduced.

  In the present embodiment, the effective video area processing unit 16 performs overdrive processing on the video data in the effective video area indicated by the effective video information in the correction result.

  As a result, the effective video area processing unit 16 can perform overdrive processing only on the effective video signal PS or the video data in the effective video area indicated by the effective video information table T1, so that it is stored in the storage unit (DRAM 14). The amount of data to be transferred can be reduced.

  One embodiment of the present invention is an input process for acquiring video data, and a region that is rectangular when the keystone correction is performed on the video data acquired in the input process and the correction result is projected onto the projection plane 2. A keystone process for generating effective video information representing the effective video area, and an effective video area processing process for processing the video data of the effective video area in the correction result based on the effective video information. This is a featured video data processing method.

  Accordingly, effective video information indicating the effective video area can be generated from the video data acquired in the input process, and video data processing can be performed on the effective video in the effective video area indicated by the effective video information, so that the storage unit (DRAM 14) Can reduce the amount of data transferred.

  As described above, according to the present invention, the amount of data transferred to the DRAM can be reduced by adding effective video information indicating an effective video area in video data processing.

  In addition, you may make it implement | achieve part or all of the projector 1 in embodiment mentioned above with a computer. In that case, the program for realizing the control function may be stored in a computer-readable storage medium, and the program stored in the storage medium may be read into a computer system and executed.

  The “computer system” here is a computer system built in the projector 1 and includes an OS and hardware such as peripheral devices. The “computer-readable storage medium” refers to a storage device such as a portable medium such as a flexible disk, a magneto-optical disk, a ROM, a CD-ROM, or a hard disk built in a computer system. Furthermore, "computer-readable storage medium" means a program that dynamically holds a program for a short time, such as a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line, In such a case, a volatile memory inside a computer system serving as a server or a client may be included and a program that holds a program for a certain period of time. The program may be a program for realizing a part of the above-described functions, or may be a program that can realize the functions described above in combination with a program already stored in a computer system.

  Moreover, you may implement | achieve part or all of the projector 1 in embodiment mentioned above as integrated circuits, such as LSI (Large Scale Integration). Each functional block of the projector 1 may be individually made into a processor, or a part or all of them may be integrated into a processor. Further, the method of circuit integration is not limited to LSI, and may be realized by a dedicated circuit or a general-purpose processor. Further, in the case where an integrated circuit technology that replaces LSI appears due to progress in semiconductor technology, an integrated circuit based on the technology may be used.

  As described above, the embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to that described above, and various design changes and the like can be made without departing from the scope of the present invention. It is possible to

DESCRIPTION OF SYMBOLS 1 Projector 2 Projection surface 10 Operation part 11 Input part 12 Control part 13 Image | video data processing part 131 Resize part 132 OSD part 133 Keystone process part 134 Frame rate conversion part 135 Overdrive part 136 DRAM I / F part 1331 Processing part 1332 Determination Part 1333 generation part 14 DRAM (storage part)
15 Projector 16 Effective Video Area Processor

Claims (6)

An input unit for acquiring video data;
A keystone processing unit that performs keystone correction on the video data acquired by the input unit and generates effective video information representing an effective video region that is a region that becomes a rectangle when projected onto a projection plane in the correction result;
An effective video area processing unit for processing the video data of the effective video area in the correction result based on the effective video information;
A storage unit for storing video data to be processed by the effective video region processing unit ,
The effective image region processing part, based on the valid image information, characterized by Rukoto selectively stores the image data of the effective image area in the storage unit projector. The keystone processing unit
The effective video information is transmitted to the effective video area processing unit using a table including information indicating a position of a start point of the effective video area of each line and information indicating a position of an end point. Item 14. The projector according to Item 1 . The keystone processing unit
The effective image information is transmitted to the effective image area processing unit using an effective image signal that is synchronized with image data and indicates whether each pixel belongs to the effective image area. The projector according to claim 1 or 2 . The effective image area processing unit, the correction of the result, any one of claims 1 to 3, characterized in that the frame rate conversion to the video data of the effective image area of the indicating effective image information The projector according to item. The effective image area processing unit, said one of the correction result, any one of claims 1 to 4, characterized in that the overdrive processing on the image data of the effective image area of the indicating effective image information The projector according to one item. An input process for obtaining video data;
Performing a keystone correction on the video data acquired in the input process, and generating a valid video information representing an effective video area that is a rectangular area when projected onto a projection plane in the correction result; and
An effective video area processing step of processing the video data of the effective video area in the correction result based on the effective video information;
I have a,
In the effective image area process, on the basis of the effective image information, the image data of the effective image area, the image data to be processed in the effective image area process is Ru is selectively stored in the storage unit to be stored A video data processing method characterized by the above.

Images