WO2006085827A1 - Method and apparatus for forming a panoramic image - Google Patents
Method and apparatus for forming a panoramic image Download PDFInfo
- Publication number
- WO2006085827A1 WO2006085827A1 PCT/SG2006/000024 SG2006000024W WO2006085827A1 WO 2006085827 A1 WO2006085827 A1 WO 2006085827A1 SG 2006000024 W SG2006000024 W SG 2006000024W WO 2006085827 A1 WO2006085827 A1 WO 2006085827A1
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- WO
- WIPO (PCT)
- Prior art keywords
- image
- camera
- display
- photograph
- blending area
- Prior art date
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Classifications
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B37/00—Panoramic or wide-screen photography; Photographing extended surfaces, e.g. for surveying; Photographing internal surfaces, e.g. of pipe
- G03B37/04—Panoramic or wide-screen photography; Photographing extended surfaces, e.g. for surveying; Photographing internal surfaces, e.g. of pipe with cameras or projectors providing touching or overlapping fields of view
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B17/00—Details of cameras or camera bodies; Accessories therefor
- G03B17/02—Bodies
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B17/00—Details of cameras or camera bodies; Accessories therefor
- G03B17/18—Signals indicating condition of a camera member or suitability of light
- G03B17/20—Signals indicating condition of a camera member or suitability of light visible in viewfinder
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B37/00—Panoramic or wide-screen photography; Photographing extended surfaces, e.g. for surveying; Photographing internal surfaces, e.g. of pipe
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T3/00—Geometric image transformation in the plane of the image
- G06T3/40—Scaling the whole image or part thereof
- G06T3/4038—Scaling the whole image or part thereof for image mosaicing, i.e. plane images composed of plane sub-images
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
- H04N23/63—Control of cameras or camera modules by using electronic viewfinders
- H04N23/633—Control of cameras or camera modules by using electronic viewfinders for displaying additional information relating to control or operation of the camera
- H04N23/634—Warning indications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
- H04N23/698—Control of cameras or camera modules for achieving an enlarged field of view, e.g. panoramic image capture
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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
- H04N5/2624—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 for obtaining an image which is composed of whole input images, e.g. splitscreen
Definitions
- This invention relates to a method and apparatus for forming a panoramic image and refers particularly, though not exclusively, to such a method and apparatus that facilitates the formation of a panoramic image with no portion of the panoramic image missing.
- the first frame is taken and displayed.
- the next frame is displayed live on the screen as the user moves the camera.
- the user moves that camera in such a way that there is a slight overlap in photograph information in the new frame to be taken.
- video clips can be analyzed and a panoramic photograph created from it. This becomes difficult when the size of the photographs (e.g. 4 to 8 megapixels) and the number of photographs becomes large. Video takes more storage than multiple images, and requires more processing.
- the third and final known method is to automatically perform the stitching each time a photograph is taken. If there is insufficient or no overlap, the stitching process will fail and the user will be prompted to take another photograph. Again, processing takes power and time.
- a method for forming a panoramic image using a camera comprises placing the camera into a panoramic image mode and taking a first photograph using the camera. On a display of the camera a blending area is formed. The blending area includes a part of a first image of the first photograph displayed on the display. The blending area is at a side of the display. The camera is moved before being prepared to take a second photograph. In the blending area only, a pixel matching process is performed for determining an alignment of the portion of the first image in the blending area and part of the second image of the second photograph in the blending area.
- a computer useable medium comprising a computer program code that is configured to cause a processor in a camera to execute one or more functions to enable the performance of the above method.
- a camera for taking a panoramic image.
- the camera comprises a body, a lens, a display, an image capturing device, a processor, a controller, and a memory.
- the display is for displaying images of photographs.
- the display comprises a blending area for determining an alignment of a portion of a first image in the blending area with a part of an image of a yet-to-be-taken second photograph.
- the blending area may be at a side of the display and may comprise a predetermined percentage of the first image, the predetermined percentage being the range of 5% to 25%.
- the red, green and blue values of all pixels in the blending area may be reduced to a fixed amount, the fixed amount being in the range 40% to 60%. It is preferably 45%.
- the red, green and blue values of the pixels of the portion of the first image in the blending area and the red, green and blue values of the pixels of the part of the second image in the blending area may be summed for display on the display prior to being reduced. After summing and reduction, pixels in the blending area may be further reduced by a set amount. The set amount may be 10%. In this way the red, green and blue values in the portion are at 90% being 45% from the first image and 45% from the second image.
- the blending area may extend for the full length of the side of the display, the side being selected from: top, bottom, left side, and right side.
- the side may be determined by a direction of the movement of the camera.
- a preset percentage of the first image may be removed from the display to leave the predetermined percentage in the display, the present percentage being in the range 75% to 95%.
- the preset percentage may be 85% and the predetermined percentage may be 15%.
- All pixels in the blending area may be given a weight value representing visual importance. Pixels that form the boundary edges of the first and second images area may be given higher weight values.
- a boundary edge may be a collection or group of pixels that defines a clear separation of visual contrast within an image; and may further be the outlines of objects as opposed to a differently contrasted background.
- a match status indicator may be displayed on the display, the match status indicator being variable in consequence of the result of the pixel matching process.
- a determination of the side on which the blending area is to be displayed may be made after the pixel matching process.
- a subsequent preview image of a yet-to- be-taken subsequent photograph may have the side in common with a previous photograph.
- the previous photograph may be an immediately proceeding photograph.
- a penultimate aspect there is provided method of forming a panoramic image using a camera.
- the method comprises taking a first photograph and displaying at least a portion of an image of the first photograph on a display; moving the camera for a second photograph and displaying at least a part of preview image of the second photograph on the display; conducting a pixel match for the portion and the part; and using a match status indicator to indicate a result of the pixel match.
- the match status indicator may be variable in consequence of the pixel matching process, and may be of a first colour for a poor pixel match, a second colour for a good pixel match, and a third colour for a perfect pixel match; the first, second and third colours being different.
- a computer useable medium comprising a computer program code that is configured to cause a processor in a camera to execute one or more functions to enable the performance of the above method.
- Figure 1 is a schematic view of a camera according to the preferred embodiment about to take a panoramic photograph
- Figure 2 is a block diagram of the camera of Figure 1 ;
- Figure 3 is an image of a first photograph for the panoramic photograph
- Figure 4 is an image prior to the taking of a second photograph for the panoramic photograph
- Figure 5 is an image corresponding to Figure 4 with the image closer to a match
- Figure 6 is an image showing the weights photograph for the image of Figure 5;
- Figure 7 is an image corresponding to Figures 4 and 5 at the completion of the match
- Figure 8 is a flow chart for the method of the first embodiment
- Figure 9 is an example of reference images for a second embodiment
- Figure 10 is an image of a selected reference image from the reference image of Figure 9;
- Figure 11 is a weight's photograph of the reference image of Figure 10.
- Figure 12 is a weight's photograph of the stitching portion of the reference image of Figure 10;
- Figure 13 is an image of the matching status;
- Figure 14 is the first stitched image of the second embodiment; and Figure 15 is a flow chart for the method of the second embodiment.
- the camera 10 may be a digital or film camera, a digital camera built in to a mobile/cellular telephone or a personal digital assistant (PDA), or a web camera.
- PDA personal digital assistant
- the camera 10 has an imaging system generally indicated as 12 and comprising a lens 14, view finder 16, shutter 18, built-in flash 20, shutter release 22, and other controls 24.
- an image capturing device 36 such as, for example, a charge-coupled device; and a processor 26 for processing the image data received in a known manner, memory 28 for storing each image as image data, and a controller 30 for controlling data sent for display on display 32.
- Processor 26 performs conventional digital photographic image processing such as, for example, compressing and formatting a captured photographic image.
- the imaging system 12, including the image capturing device 36, is able to take and capture photographic images of every day scenes.
- the imaging system 12 may have a fixed or variable focus, zoom, and other functions found in digital still cameras.
- the first shot 30 as shown in Figure 3 may be taken.
- the settings for the first shot will be fixed for the rest of the shots that make up the final panoramic image.
- the previously captured image will be moved towards the right for a predetermined percentage of its width.
- the predetermined percentage may be in the range 75% to 95% preferably 85%.
- the remaining portion is 5% to 25% of the image and is preferably 15% of the image.
- the remaining portion of the previously captured image will be blended with the image of the second photograph in a blending area 32.
- the blending area 32 will normally be at a side of display 32, but it may be adjacent a side, or even remote from a side. Depending on the direction of the panoramic series capture sequence, the blending area 32 could reside at any of the four sides of the LCD display- top, bottom, left side or right side.
- the Red Green Blue (“RGB") value of the pixels for the first image within the blending area 32 will be reduced by a predetermined amount such as, for example, 40% to 60%, preferably 50%. Before the capturing of the next photograph the viewfinder and/or LCD display will show a preview of the image to be captured.
- the RGB value of the pixels within the blending area for the image to be captured will also be reduced by the same amount (e.g. 50%).
- the blending area 32 is thus made up of pixels from the previous and current images using additive blending with their reduced RGB values being added together.
- the summed RGB values are further reduced by a preset amount such as, for example, 5 to 25%, preferably 10%.
- the rest of the LCD display will present the current image without alteration.
- RGB [LCD] P (RGB [image (previous)] P X 0.5 + RGB [preview] P X 0.5) X 0.9
- a 2" LCD may have 206,000 pixels.
- the blending area will consist of 30,900 pixels.
- the blending and matching processes applies only to the pixels within the blending area. Therefore, to process in a stitch assist mode where tone is blending the display process, to calculate the match status only 30,900 pixels are involved.
- a status indicator 34 is provided on the image 30 and the color of the status indicator 34 provides an indication of how well the previously captured image 30 and the current preview image 36 match within the blending area 32. For example, a red color may represent poor matching, a yellow color may represent partial matching, and a green color may represent perfect matching.
- each pixel used in the matching process is given a weight value to represent its visual importance. It is preferable not to use equal weighting for all the pixels because certain pixels that make up boundary edges are visually more important. The following is how each pixel's weight value (W) and matching value (M) can be computed:
- the pixels subset in the blending area used is defined at MP.
- M means the matching status to be used to evaluate the result of the matching.
- a small value represents good matching. This value is used to determine the color of the matching status index.
- P (i, j) for the i row and j column pixel on the blending area.
- W(i, j) for the weight of pixel P (i, j).
- W(i, j) W(i, j)+abs(R [image(previous)] p(i+s*u,j+s*v) -R [image(previous)] p(i,j))
- Wjmax max(W(i,j), (i,j) e MP)
- W(i, j) W(I, j)/W_max; // P pixel's weight value W
- M O; //M is the matching value for((ij) ⁇ MP)
- M M + W(i,j)* (abs(R [image(preview)] p(i,j)
- R [image(previous)]p(i,j) meant previous image at pixel P(i,j) Red value
- G [image(previous)]p(i,j) meant previous image at pixel P(i,j) Green value
- B [image(previous)]p(i,j) meant previous image at pixel P(ij) Blue value
- R [image(preview)]p(i,j) meant preview image at pixel P(i,j) Red value
- G [image(preview)]p(ij) meant preview image at pixel P(ij) Green value
- B [image(preview)]p(i,j) meant preview image at pixel P(i,j) Blue value
- nPixel meant number of MP
- Method 1 is faster than method 2 because it doesn't need calculate the preview image pixels' weight. But method 2 is more accurate because it detects the boundary edges' information for matching. Therefore, even under different lighting conditions method 2 may achieve a good result, whereas under different lighting conditions method 1 may not.
- the status indicator 34 is displayed and is red (824) in colour to indicate that the next photograph should not be taken.
- the camera can than be moved for the next shot (803).
- the image displayed is moved by the predetermined amount (e.g. 85%) and the blending area 32 is formed (804).
- the number of pixels in the blending area 32 is also reduced by 50% (805).
- step (802) what is displayed is as shown in Figure 4.
- step (803) what is displayed is shown in Figure 5.
- in the blended area 32 are two images of the flagpole - one from the portion of the first image that remains in the blending area 32, and one from the yet-to-be-taken second image that forms the majority of the displayed image.
- the pixel matching process described above is then performed (806) only within the blending area 32.
- queries 807, 809 and 811 are raised to determine the match status. If NO at 807 and 809 (808 and 810 respectively) and YES (812) at (811 ), the status indicator 34 is displayed as red (813) to indicate a poor or bad match.
- the camera is then moved (814) until there is a visual matching of features in the blending area 32. The process then reverts back to (806).
- the status indicator 34 is displayed as yellow ( Figure 5) indicating a good, but not perfect match.
- the camera may be moved (825) to try to achieve an improved match, and the process reverts to (806). This is shown in Figure 7. At this stage the images of the flagpole are aligned. Therefore, in (807) the answer is YES (817) and the display indicator 34 is changed to green (818) and the next photograph is able to be taken (819).
- a shutter release lockout so that when camera 10 is in the panoramic mode and the second photograph is to be taken, if the status indicator 34 is red the second photograph cannot be taken. This would also be relevant for subsequent photographs.
- the order or sequence of the photographs taken may be different, and may be random. Normal stitching systems can't cope with such an arrangement.
- Figure 15 To enable to stitching to take place the process of Figure 15 is followed.
- One photograph is taken (1501 ) and its image is used as the first image (1502) for stitching to take place.
- the blending area 32 is then formed (1503) and placed on the display, and the status indicator 34 displayed as red (1504).
- the camera 10 is then moved (1505) and the pixel matching process is performed in the blending area (1506) as is described above in relation to the first embodiment. If the first image is 1 in Table 1 , the blending area 32 will be on the right side of the first image and on the left side of the second image.
- the blending area 32 is moved to be on the correct side of the display (1507) so that blending can take place as described above (1508) in relation to the first embodiment.
- the second photograph is then taken.
- a query is raised (150) to determine if more photographs are required. If yes (1512), the process continues to (1514). If no (1511), the process ends. If yes, the camera is then moved (1514) and a pixel match attempted (1515). In doing so a common edge between a previous image and the image to be taken must be found (1516). If there is no common or overlapping edge with a previous photograph (1517), an error message is displayed (1518) and the process reverts to (1514).
- the previous photograph may be any previous photograph taken as part of the image sequence to from the panoramic image; or may be limited to the immediately previous image, particularly if memory and/or processing power is limited.
- the order of photographs may be in any sequence. Each subsequent photograph must have a common side with the photograph taken prior to it for stitching to take place. For example, if photograph 6 were the first photograph, only photographs 1 , 5 and 7 could be used for the second photograph. If photograph 5 is the second photograph, any one of photographs 12, 4, 7 or 8 could be the third photograph as each has an edge in common with photograph 6 or photograph 5. However, photographs 3 and 9 could not be the third photograph as they have no common edge with photograph 6 or photograph 5. Therefore, the photographs can be taken in any order provided there is a common edge with a previous photograph.
- the first photograph may be taken from a library or card of precedent photographs.
- precedent photographs may have very high resolution and high megapixels so a low megapixel camera may be able to be used to from a high megapixel image.
- FIG. 9 This embodiment is illustrated in Figures 9 to 14 and is for creating images and stitching them together.
- the purpose is to create a large, high quality image (not just panoramic images) by using a low mega-pixels digital camera to take a high mega-pixels photograph.
- a precedent card 90 is provided.
- One photograph 92 from the precedent card is selected as a precedent photograph.
- the precedent photograph is adjusted to a desired position on the LCD screen or viewfinder.
- Part of the precedent photograph 92 in the LCD is the blending area 32 ( Figure 10).
- the preview image about to be taken is matched to the precedent image in the blending area 32 using the matching methods as in the first embodiment described above and as shown in Figures 10 to 14.
- Figure 14 shows the first image.
- the photograph stitch software is used to stitch them together on computer to create a large and high quality photograph.
- the status indicator 34 may be accompanied by an audible indication such as, for example, a "beep” at a low repetition frequency corresponding to the red colour and a poor match; the "beep” at middle repetition frequency corresponding to the yellow colour and a good match; and the "beep” at a high repetition frequency corresponding to the green colour and perfect match.
- an audible indication such as, for example, a "beep” at a low repetition frequency corresponding to the red colour and a poor match; the "beep” at middle repetition frequency corresponding to the yellow colour and a good match; and the "beep” at a high repetition frequency corresponding to the green colour and perfect match.
Abstract
Description
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Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE112006000358.5T DE112006000358B4 (en) | 2005-02-11 | 2006-02-10 | Method and device for creating a panoramic image |
GB0715571A GB2438335B (en) | 2005-02-11 | 2006-02-10 | Method and apparatus for forming a panoramic image |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/056,597 | 2005-02-11 | ||
US11/056,597 US7646400B2 (en) | 2005-02-11 | 2005-02-11 | Method and apparatus for forming a panoramic image |
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WO2006085827A1 true WO2006085827A1 (en) | 2006-08-17 |
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PCT/SG2006/000024 WO2006085827A1 (en) | 2005-02-11 | 2006-02-10 | Method and apparatus for forming a panoramic image |
Country Status (6)
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US (1) | US7646400B2 (en) |
CN (1) | CN1854887B (en) |
DE (1) | DE112006000358B4 (en) |
GB (1) | GB2438335B (en) |
HK (1) | HK1097052A1 (en) |
WO (1) | WO2006085827A1 (en) |
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GB2438335A (en) | 2007-11-21 |
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HK1097052A1 (en) | 2007-06-15 |
CN1854887B (en) | 2010-09-29 |
DE112006000358T5 (en) | 2007-12-27 |
CN1854887A (en) | 2006-11-01 |
GB2438335B (en) | 2010-04-28 |
DE112006000358B4 (en) | 2019-07-04 |
GB0715571D0 (en) | 2007-09-19 |
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