WO2005041124A1 - 画像処理方法および画像処理装置、並びにプログラム - Google Patents
画像処理方法および画像処理装置、並びにプログラム Download PDFInfo
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- WO2005041124A1 WO2005041124A1 PCT/JP2004/016116 JP2004016116W WO2005041124A1 WO 2005041124 A1 WO2005041124 A1 WO 2005041124A1 JP 2004016116 W JP2004016116 W JP 2004016116W WO 2005041124 A1 WO2005041124 A1 WO 2005041124A1
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- 238000012545 processing Methods 0.000 title claims abstract description 72
- 238000003672 processing method Methods 0.000 title claims abstract description 10
- 238000006243 chemical reaction Methods 0.000 claims abstract description 113
- 238000000034 method Methods 0.000 claims abstract description 27
- 230000009466 transformation Effects 0.000 claims description 17
- 238000010586 diagram Methods 0.000 description 16
- 230000003287 optical effect Effects 0.000 description 4
- PCTMTFRHKVHKIS-BMFZQQSSSA-N (1s,3r,4e,6e,8e,10e,12e,14e,16e,18s,19r,20r,21s,25r,27r,30r,31r,33s,35r,37s,38r)-3-[(2r,3s,4s,5s,6r)-4-amino-3,5-dihydroxy-6-methyloxan-2-yl]oxy-19,25,27,30,31,33,35,37-octahydroxy-18,20,21-trimethyl-23-oxo-22,39-dioxabicyclo[33.3.1]nonatriaconta-4,6,8,10 Chemical compound C1C=C2C[C@@H](OS(O)(=O)=O)CC[C@]2(C)[C@@H]2[C@@H]1[C@@H]1CC[C@H]([C@H](C)CCCC(C)C)[C@@]1(C)CC2.O[C@H]1[C@@H](N)[C@H](O)[C@@H](C)O[C@H]1O[C@H]1/C=C/C=C/C=C/C=C/C=C/C=C/C=C/[C@H](C)[C@@H](O)[C@@H](C)[C@H](C)OC(=O)C[C@H](O)C[C@H](O)CC[C@@H](O)[C@H](O)C[C@H](O)C[C@](O)(C[C@H](O)[C@H]2C(O)=O)O[C@H]2C1 PCTMTFRHKVHKIS-BMFZQQSSSA-N 0.000 description 3
- 230000001131 transforming effect Effects 0.000 description 3
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- 241000226585 Antennaria plantaginifolia Species 0.000 description 1
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Classifications
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- G06T3/18—
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/387—Composing, repositioning or otherwise geometrically modifying originals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/222—Studio circuitry; Studio devices; Studio equipment
- H04N5/262—Studio circuits, e.g. for mixing, switching-over, change of character of image, other special effects ; Cameras specially adapted for the electronic generation of special effects
Definitions
- Image processing method image processing apparatus, and program
- the present invention relates to an image that divides one image into a plurality of regions and, when projective transformation is performed for each image data of each region, sets the region in a suitable range.
- the present invention relates to a processing method, an image processing device, and a program.
- barrel-shaped distortion in which the subject appears to bulge outward and pincushion-type distortion in which the subject appears to dent inward may be conspicuous.
- Patent Document 1 As a technique for performing geometric transformation on an image, there is a technique disclosed in Patent Document 1.
- Patent Document 1 JP 2001-250114 A
- the problem is that the number of pixels of the image sensor increases, and the image data becomes redundant as the data amount of one image increases.
- the present invention has been made in view of such a situation, and it is desirable to divide one image into a plurality of regions and perform conversion for each region so as to shorten the processing time and to reduce the processing time.
- An area can be set in a range.
- the image processing method of the present invention provides an area setting step of setting a first area by dividing a converted image of a captured image by a line passing through an origin and parallel to a horizontal axis and a vertical axis.
- the first area is set so as not to include the vertical axis.
- the first area that includes at least one of the horizontal axis and the vertical axis when set at the default size is changed to one that does not include the horizontal axis and the vertical axis. It can be further divided as follows.
- the processing of the area setting step when there is a first area that includes at least one of the horizontal axis and the vertical axis when the area is set with the default size, The size of all the first areas may be changed so that the horizontal axis and the vertical axis are not included.
- the image processing apparatus of the present invention provides an area setting unit that divides a converted image of a captured image by a line passing through the origin and parallel to a horizontal axis and a vertical axis, and setting a first area; Setting Conversion means for projectively converting the second area before image conversion corresponding to the first area set by the setting means to the first area, wherein the area setting means includes a horizontal axis and a vertical axis. It is characterized in that the first area is set so as not to exist.
- a program according to the present invention includes an area setting step of setting a first area by dividing a converted image of a captured image by lines parallel to a horizontal axis and a vertical axis passing through the origin.
- the first region is set so as not to include the horizontal axis and the vertical axis.
- the converted image of the captured image is divided by a line passing through the origin and parallel to the horizontal axis and the vertical axis, and the first area Is set. Further, the second area before image conversion corresponding to the set first area is projectively transformed into the first area. Further, the first area is set so as to include the horizontal axis and the vertical axis.
- an image with reduced distortion can be obtained in a shorter time.
- data of an image to be processed can be reliably read from a storage unit that stores data of the entire image.
- FIG. 1 is a block diagram illustrating a configuration example of a personal computer to which the present invention has been applied.
- FIG. 2 is a diagram showing an example of an image before conversion and an image after conversion.
- FIG. 3 is a block diagram illustrating a functional configuration example of an image conversion unit.
- FIG. 4 is a diagram showing an example of a tile area and an image before conversion.
- FIG. 5 is an enlarged view of a certain region in FIG. 4.
- FIG. 6 is a diagram showing another example of a tile area and an image before conversion.
- FIG. 7 is an enlarged view showing a certain region in FIG. 6.
- FIG. 8 is a diagram showing a specific example of a tile size.
- FIG. 9 is a diagram showing an example in which the tile size in FIG. 8 is changed.
- FIG. 10 is a diagram showing pixel interpolation.
- FIG. 11 is another diagram showing interpolation of pixels.
- FIG. 12 is a flowchart illustrating an image conversion process of an image conversion unit.
- FIG. 13 is a diagram showing an example in which a tile size is changed.
- FIG. 14 is a flowchart illustrating another image conversion process of the image conversion unit. Explanation of symbols
- FIG. 1 is a block diagram showing a configuration example of a personal computer 1 to which the present invention is applied.
- a CPU Central Processing Unit ll executes various processes according to a program stored in a ROM (Read Only Memory) 12 or a program loaded from a storage unit 18 into a RAM (Random Access Memory) 13. I do.
- the storage unit 18 stores, for example, an image processing program for performing various processes on an image captured by a digital camera.
- the RAM 13 also appropriately stores data necessary for the CPU 11 to execute various processes.
- the CPU 11, the ROM 12, and the RAM 13 are mutually connected via a bus 14.
- the bus 14 is also connected to an input / output interface 15.
- the input / output interface 15 includes an input unit 16 including a keyboard, a mouse, and the like.
- a display such as a CRT (Cathode Ray Tube) or LCD (Liquid Crystal Display), an output unit 17 such as a speaker, a storage unit 18 such as an HDD (Hard Disk Drive), and communication via a network.
- Communication unit 19 is connected.
- a drive 20 is connected to the input / output interface 15 as needed, and a removable medium 21 made of a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, or the like is appropriately mounted.
- the personal computer 1 having such a configuration, for example, digital An image captured by the camera is input, and conversion processing for correcting barrel distortion and pincushion distortion included in the image is performed.
- FIG. 2 shows an image in which a rectangular object is photographed in a barrel shape when the object is photographed (an image in which barrel distortion occurs), and a converted image obtained by converting the image.
- FIG. 3 is a diagram illustrating an example of an image.
- the image data before the conversion is attached to, for example, a digital camera (not shown), and a removable medium 21 for storing the taken image is attached to the drive 20 so that the personal computer 1 (storage) Part 18).
- FIG. 3 is a block diagram showing an example of a functional configuration of the image conversion unit 31 realized by executing the image processing program by the CPU 11 of FIG.
- the image conversion unit 31 divides the converted image of the captured image into a plurality of areas (hereinafter, appropriately referred to as tile areas) arranged in a tile shape. Conversion processing and the like are sequentially performed on each of them.
- the tile size determination unit 41 determines whether the size of the instructed image is specified by the user operates the input unit 16 to specify a predetermined image stored in the storage unit 18 and instructs to perform a conversion process for correcting the distortion.
- the tile size determination unit 41 also has information on the capacity of the buffer (RAMI 3) used for performing the conversion processing, and based on information on the size and data amount of the image, information on the capacity of the buffer, and the like. Then, determine the tile size (the size of the tile area).
- the tile size determination unit 41 determines a tile size, selects one tile area to be processed, and outputs information indicating the position of the tile area to be processed to the image area calculation unit 42 I do.
- the tile size determination unit 41 determines that the tile area to be processed includes a horizontal axis and a vertical axis passing through the origin of the image after conversion (hereinafter collectively referred to as a central axis as appropriate). If , Change its tile size so that it does not include the central axis.
- the image area calculation unit 42 calculates an area on the image before conversion corresponding to the tile area to be processed. Further, the image area calculation unit 42 calculates a rectangular or square (rectangular) area including the calculated area on the image before conversion, and outputs information indicating the calculated position of the area to the image data reading Z writing unit 43. Output.
- the image data readout Z writing unit 43 reads out the pixel data included in the area calculated by the image area calculation unit 42 from the storage unit 18, and reads the read data from the pre-conversion data formed in the buffer 44.
- the data is stored in the buffer 51.
- the conversion processing unit 45 refers to the pre-conversion data stored in the pre-conversion data buffer 51, performs projective conversion on each pixel, and interpolates the pixels as necessary.
- the converted data is stored in the converted data buffer 52 formed in the buffer 44.
- each unit is performed for each tile area. For example, when one entire image with reduced distortion is stored in the converted data buffer 52, the converted data is output from the image conversion unit 31. Is done. The data output from the image conversion unit 31 is stored again in the storage unit 18 or used to display the converted image on a display.
- FIG. 4 is a diagram showing an example of an image after conversion (tile area) and an image before conversion.
- FIG. 4 shows only the horizontal distortion (the same applies to FIG. 6).
- the converted image is divided by a line parallel to the horizontal X-axis and the vertical Y-axis passing through the origin, and the processing target at that time is divided. If the tile area is an upper left area indicated by oblique lines, the image conversion unit 31 calculates a corresponding point ABCD on the image before conversion from the positions of the four vertices abed.
- a lens mounted on a digital camera or the like is usually designed to substantially satisfy the relationship of the following expression (1).
- [Equation 1] y f-tan 0 ⁇ ⁇ ⁇ (1)
- Equation (1) “y” represents the image height, “f” represents the focal length, and “ ⁇ ” represents the half angle of view.
- the straight line portion of the object is formed as a straight line on the imaging surface.
- some types of lenses are not designed to satisfy the relationship of equation (1), and especially when viewing images taken with a wide-angle lens with a short focal length, the results are shown on the left side of Fig. 2. Thus, the straight part may appear to be clearly distorted.
- the characteristic power is not designed with Equation (1) as a target.
- the power differs depending on the projection method on the light receiving surface such as a stereoscopic projection method and an equidistant projection method. Designed as a premise.
- Equation (2) “L0” represents the distance from the optical axis (center) of the image before conversion, and “L1” represents the distance from the optical axis of the image after conversion. “Y (0)” represents the characteristics of the zenith angle and the image height of the lens, and “A” is a constant that defines the shooting range.
- the position of the pixel after the conversion corresponding to the position of the pixel before the conversion can be calculated by the conversion using Expression (2).
- Equation (2) it is possible to calculate the position of the pixel before the conversion corresponding to the position of the pixel after the conversion.
- the image area calculation unit 42 in FIG. 3 calculates the four vertices a to d of the tile area to be processed. For (Fig. 4), the corresponding positions on the image before conversion are calculated from Equation (2), and the area consisting of points A to D on the image before conversion corresponding to the tile area to be processed is calculated. Determine the area.
- the image area calculation unit 42 calculates, for example, a rectangular area having a point EBFD force as shown in FIG. 5, in order to read out pixel data used in the processing by the conversion processing unit 45.
- FIG. 5 is an enlarged view of the vicinity of the point ABCD in FIG. 4, and the rectangular area including the point EBFD includes the area of the point ABCD.
- the image area calculation unit 42 calculates the area of the pixel that also has the point EBFD force, and reads the data of the pixels included in the calculated area (the data of the pixels in the rectangle that also has the point EBFD force) from the storage unit 18.
- the tile area to be processed does not include the central axis.
- the tile area to be processed at that time is the central axis (see FIG. In the case of (6), the tile size determination unit 41 changes the tile size so that the tile area to be processed does not include the central axis.
- a tile region having the point a ′ b ′ c ′ d ′ as a vertex is a region to be processed, and a region on the image before conversion corresponding to the region is calculated from the inverse transformation of the equation (2).
- a region having a point A′B′C′D ′ force having a curve whose left side swells slightly outward is calculated.
- FIG. 7 is an enlarged view of the area consisting of points A ′ B ′ C ′ D ′ in FIG. 6.
- the points A ′ B ′ C If the vertex of a square consisting of 'D' is specified, only the shaded area in Fig. 7 is specified. That is, the left side Region # 1 surrounded by the line is not specified, and the data of the pixels included in region # 1 cannot be read. Projection transformation, interpolation processing, etc. are performed based on the read data, so if the area of the pixel from which data is to be read is specified in this way, data to be subjected to projection transformation and interpolation processing will not be read. Will be.
- the tile size determination unit 41 determines the processing target pixel data so that the data of the pixel to be subjected to the projection conversion and the interpolation processing can be reliably read. Change the tile size so that the tile area does not include the central axis!
- FIG. 8 is a diagram showing a specific example of the tile size.
- the entire tile area (the entire image after conversion) is 400 ⁇ 300.
- the tile size of each tile is 100 x 60, the area at the top of the second column from the left is tile area # 1, the area below it is tile area # 2, and the area below it is tile area # 3. Has been done.
- the tile size determination unit 41 determines that the tile area # 3 does not include the X-axis as shown in FIG. , Change the tile size to 100 x 30 and divide tile area # 3 into two tile areas # 3-1, # 3-2.
- the tile size to be processed includes the central axis
- the tile size is changed to exclude the central axis, so that the data of the pixel to be processed is stored in the storage unit 18. Reading can be performed reliably.
- the area is calculated as described above, and the conversion processing unit 45 performs processing based on the read pixel data.
- pixel interpolation is performed by the conversion processing unit 45 as necessary.
- FIG. 10 and FIG. 11 are diagrams showing pixel interpolation.
- the position is specified as, for example, (100.4, 52.7), and interpolation is performed using the pixel values of the pixels in the vicinity of the specified position.
- the pixel value of pixel # 1 at position (100, 52) and the pixel value of pixel # 2 at position (100, 53) are referred to, and the pixel of interest is interpolated.
- the value of the decimal point of (100.4, 52.7) is relatively determined. For example, it may be determined by linear interpolation.
- Such projective transformation and interpolation processing are performed on each pixel included in the tile area to be processed.
- the tile area to be processed is switched, and the processing is repeated until the processing of one entire image is completed.
- step S1 the tile size determination unit 41 sets a default tile size, proceeds to step S2, and selects a tile area to be processed. For example, as shown in FIG. 8, a tile area of 100 ⁇ 60 size is set, and a tile area to be processed is set from the upper left area.
- step S3 the tile size determination unit 41 determines whether or not the selected processing target tile area includes the central axis. Proceed to 4 to change the size of the tile area to be processed as described with reference to FIG.
- the information (size, position) of the tile area selected by the tile size determination unit 41 is output to the image area calculation unit 42.
- step S5 the image area calculation unit 42 calculates the corresponding area on the image before conversion from the position of the tile area to be processed. For example, as described with reference to FIGS. 4 to 7, an area that does not include a curve is calculated as an area that includes a reference pixel.
- the information of the area calculated by the image area calculation unit 42 is output to the image data readout Z writing unit 43.
- the image data read-out Z writing unit 43 secures a memory (the converted data buffer 52) for storing the converted data in step S6, and proceeds to step S7, where the data before conversion, that is, the image area calculation is performed.
- a memory (data buffer before conversion 51) for storing the data of the pixels included in the area calculated by the unit 42 is secured.
- step S8 the image data readout Z writing unit 43 reads out the data of the pixels included in the area calculated by the image area calculation unit 42 from the storage unit 18 and stores the data in the pre-conversion data buffer 51.
- step S9 the conversion processing unit 45 performs projection conversion, interpolation processing, and the like on each pixel whose data is stored in the pre-conversion data buffer 51, and converts the converted data into the post-conversion data buffer 52. To memorize.
- step S10 the conversion processing unit 45 determines whether or not all pixels read out as corresponding to the tile area to be processed have been subjected to projection conversion or the like, and if it has been determined not to have been performed. Then, the process returns to step S9, and the process for each pixel is repeated.
- step S10 when it is determined in step S10 that all the pixels have been subjected to the projection transformation or the like, the process proceeds to step S11, and the conversion processing unit 45 next determines whether or not the processing has been performed for all the tile areas. Is determined. If the conversion processing unit 45 determines in step S11 that all tile areas have been processed, the process proceeds to step S12.
- step S12 the tile size determination unit 41 changes the tile area to be processed, and repeats the processing from step S3.
- step S11 all tile areas If it is determined that the processing has been performed on the image, the processing is terminated, and the data of one entire image whose distortion has been corrected is output from the image conversion unit 31.
- the data output from the image conversion unit 31 is stored again in the storage unit 18 or used for displaying an image on a display.
- one image is divided into a plurality of areas, and the processing is performed for each area. Therefore, even if the memory cannot be sufficiently secured, the processing can be easily performed.
- the area to be processed is specified as an area not including a curve, data of pixels included in the area to be processed can be easily read.
- the size is changed so as not to include the central axis, and the force data is read out. Data can be prevented from not being read
- the tile size to be processed includes the center axis
- the tile size is changed only for that area.
- all tiles are processed. You may change the size of the area!
- tile size is calculated from the following equations (3) and (4) A, XB, ⁇ are changed.
- Nx X / A (Nx is an integer, fractions are truncated)
- Ny Y / B (Ny is an integer, decimal part is truncated) ⁇ ⁇ ⁇ (3)
- the tile size may be changed by any method as long as the center axis is not included in the tile area.
- step S21 the tile size determination unit 41 sets a default tile size, and proceeds to step S22 to determine whether or not any tile area includes a central axis.
- step S22 determines in step S22 that the central axis is included in the tile area of! /,,, Or, the process proceeds to step S23. Change the tile size from (4). As a result, as shown in FIG. 13, the tile size is changed so that the center axis is not included in any of the tile areas.
- step S23 is skipped.
- step S24 a tile area to be processed is selected by the image area calculation unit 42, and in step S25, a corresponding area on the image before conversion is calculated from the position of the tile area to be processed.
- step S26 a post-conversion data buffer 52 for storing post-conversion data is secured, and the process proceeds to step S27, where a pre-conversion data buffer 51 for storing pre-conversion data is reserved.
- step S28 pixel data included in the area calculated by the image area calculation unit 42 is read from the storage unit 18 by the image data read Z writing unit 43, and stored in the pre-conversion data buffer 51. .
- step S29 each pixel stored in the pre-conversion data buffer 51 is subjected to projection conversion and interpolation processing by the conversion processing unit 45, and the converted data is stored in the post-conversion data buffer 52. You. If it is determined in step S30 that all the read pixels have been subjected to projective transformation or the like, and if it is determined in step S31 that processing has been performed on all tile areas, the processing proceeds. Is terminated.
- the tile size is changed so as not to include the central axis.
- a program constituting the software is executed by a computer incorporated in dedicated hardware or by installing various programs to realize various functions. For example, it is installed from a network or a recording medium on a general-purpose personal computer or the like that can execute the program.
- this recording medium is a magnetic disk (including a flexible disk) on which the program is recorded, which is distributed separately from the apparatus main body to provide the user with the program, Removable media consisting of an optical disk (including CD-ROM (Compact Disk-Read Only Memory), DVD (Digital Versatile Disk)), magneto-optical disk (including MD (registered trademark) (Minto Disk)), or semiconductor memory It is composed of a ROM 12 and a hard disk included in the storage unit 18 that are provided to the user in a state where they are pre-installed in the main unit of the device. .
- the step of describing a program recorded on a recording medium is not limited to processing performed in chronological order according to the described order, but is not necessarily performed in chronological order. , And also includes processing executed in parallel or individually.
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US10/577,014 US8385686B2 (en) | 2003-10-29 | 2004-10-29 | Image processing method based on partitioning of image data, image processing device based on partitioning image data and program |
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JP2003369157A JP4124096B2 (ja) | 2003-10-29 | 2003-10-29 | 画像処理方法および画像処理装置、並びにプログラム |
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JP5787637B2 (ja) | 2011-06-21 | 2015-09-30 | キヤノン株式会社 | 画像処理装置、画像処理方法 |
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US7565004B2 (en) * | 2003-06-23 | 2009-07-21 | Shoestring Research, Llc | Fiducial designs and pose estimation for augmented reality |
US20050205778A1 (en) * | 2003-10-17 | 2005-09-22 | Gsi Lumonics Corporation | Laser trim motion, calibration, imaging, and fixturing techniques |
JP4427554B2 (ja) * | 2007-02-20 | 2010-03-10 | 富士通株式会社 | 光モジュール及びその製造方法 |
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2003
- 2003-10-29 JP JP2003369157A patent/JP4124096B2/ja not_active Expired - Lifetime
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2004
- 2004-10-29 US US10/577,014 patent/US8385686B2/en active Active
- 2004-10-29 WO PCT/JP2004/016116 patent/WO2005041124A1/ja active Application Filing
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JPH11250238A (ja) * | 1998-02-27 | 1999-09-17 | Kyocera Corp | ブロック単位でディストーション補正を行うディジタル撮像装置 |
JP2000200344A (ja) * | 1999-01-04 | 2000-07-18 | Minolta Co Ltd | 画像処理装置および画像処理プログラムを記録した記録媒体 |
JP2001086332A (ja) * | 1999-09-09 | 2001-03-30 | Fuji Photo Film Co Ltd | 画像処理装置 |
JP2004064710A (ja) * | 2002-07-31 | 2004-02-26 | Fuji Photo Film Co Ltd | 撮像装置及びディストーション補正方法 |
Also Published As
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US8385686B2 (en) | 2013-02-26 |
JP2005135096A (ja) | 2005-05-26 |
US20070065043A1 (en) | 2007-03-22 |
JP4124096B2 (ja) | 2008-07-23 |
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