Classifications

• • 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
  • H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
  • H04N1/047—Detection, control or error compensation of scanning velocity or position
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
  • B41J11/00—Devices or arrangements  of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
  • B41J11/008—Controlling printhead for accurately positioning print image on printing material, e.g. with the intention to control the width of margins
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
  • B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
  • B41J29/38—Drives, motors, controls or automatic cut-off devices for the entire printing mechanism
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
  • B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
  • B41J29/38—Drives, motors, controls or automatic cut-off devices for the entire printing mechanism
  • B41J29/393—Devices for controlling or analysing the entire machine ; Controlling or analysing mechanical parameters involving printing of test patterns
• • 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
  • H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
  • H04N1/06—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using cylindrical picture-bearing surfaces, i.e. scanning a main-scanning line substantially perpendicular to the axis and lying in a curved cylindrical surface
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N2201/00—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
  • H04N2201/04—Scanning arrangements
  • H04N2201/047—Detection, control or error compensation of scanning velocity or position
  • H04N2201/04701—Detection of scanning velocity or position
  • H04N2201/04715—Detection of scanning velocity or position by detecting marks or the like, e.g. slits
  • H04N2201/04717—Detection of scanning velocity or position by detecting marks or the like, e.g. slits on the scanned sheet, e.g. a reference sheet
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N2201/00—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
  • H04N2201/04—Scanning arrangements
  • H04N2201/047—Detection, control or error compensation of scanning velocity or position
  • H04N2201/04701—Detection of scanning velocity or position
  • H04N2201/04732—Detecting at infrequent intervals, e.g. once or twice per line for main-scan control
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N2201/00—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
  • H04N2201/04—Scanning arrangements
  • H04N2201/047—Detection, control or error compensation of scanning velocity or position
  • H04N2201/04701—Detection of scanning velocity or position
  • H04N2201/04734—Detecting at frequent intervals, e.g. once per line for sub-scan control
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N2201/00—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
  • H04N2201/04—Scanning arrangements
  • H04N2201/047—Detection, control or error compensation of scanning velocity or position
  • H04N2201/04701—Detection of scanning velocity or position
  • H04N2201/04743—Detection of scanning velocity or position by detecting the image directly
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N2201/00—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
  • H04N2201/04—Scanning arrangements
  • H04N2201/047—Detection, control or error compensation of scanning velocity or position
  • H04N2201/04701—Detection of scanning velocity or position
  • H04N2201/04751—Detecting position relative to a step, e.g. using L-shaped masks, marks or gratings
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N2201/00—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
  • H04N2201/04—Scanning arrangements
  • H04N2201/047—Detection, control or error compensation of scanning velocity or position
  • H04N2201/04753—Control or error compensation of scanning position or velocity
  • H04N2201/04755—Control or error compensation of scanning position or velocity by controlling the position or movement of a scanning element or carriage, e.g. of a polygonal mirror, of a drive motor
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N2201/00—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
  • H04N2201/04—Scanning arrangements
  • H04N2201/047—Detection, control or error compensation of scanning velocity or position
  • H04N2201/04753—Control or error compensation of scanning position or velocity
  • H04N2201/04758—Control or error compensation of scanning position or velocity by controlling the position of the scanned image area
  • H04N2201/04767—Control or error compensation of scanning position or velocity by controlling the position of the scanned image area by controlling the timing of the signals, e.g. by controlling the frequency o phase of the pixel clock
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N2201/00—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
  • H04N2201/04—Scanning arrangements
  • H04N2201/047—Detection, control or error compensation of scanning velocity or position
  • H04N2201/04753—Control or error compensation of scanning position or velocity
  • H04N2201/04758—Control or error compensation of scanning position or velocity by controlling the position of the scanned image area
  • H04N2201/04787—Control or error compensation of scanning position or velocity by controlling the position of the scanned image area by changing or controlling the addresses or values of pixels, e.g. in an array, in a memory, by interpolation

Definitions

• Figure 7D shows an example embodiment of the invention which includes the formation of a pattern of image features on a recording media positioned with a first orientation on the media support of the recording apparatus of Figure 1;
• Figure 7E shows an example embodiment of the invention in which distortion in the pattern of image features of Figure 7D is detected while the recording media is positioned on the media support of the recording apparatus of Figure 1 with a second orientation that is different from the first orientation;
• Figure 7F shows the first image feature and the second image feature on the recording media of Figure 7B as shown in an unwrapped or flat orientation;
• Figure 1 schematically shows a recording apparatus 10 for forming an image 19 (i.e. schematically represented by broken lines) on a recording media 17 as per an example embodiment of the invention.
• Recording media 17 can include various media comprising a surface suitable for forming image 19 thereupon.
• Recording apparatus 10 includes a media support 12, which in this example embodiment is configured as per an external drum configuration.
• Other embodiments of the invention can include other forms of media supports configured according to internal drum configurations or flat-bed configurations for example.
• recording media 17 is supported on a cylindrical surface 13 of media support 12.
• One or more edge portions of recording media 17 are secured to cylindrical surface 13 by clamps 28A and 28B.
• Other example embodiments of the invention can secure recording media 17 to media support 12 by other methods.
• Figure 2 shows a flow chart representative of a method 100 of calibrating a recording apparatus as employed by an example embodiment of the invention.
• Recording apparatus 10 can used to form various desired images on various recording media 17.
• target image 40 comprises a precise grid pattern made up of target cells 41 which are defined by image boundaries of a desired size.
• cells 41 are square shaped.
• Target image 40 is represented in a desired alignment with various edges of recording media 17 which is shown in an unwrapped or "flat" orientation for clarity.
• Positional and size distortions can occur for several reasons. For example, overall scaling problems can arise from temperature variances.
• One or more of recording media 17, media support 12 and various transmission components such as transmission member 33 can include different material compositions that have different coefficients of thermal expansion. Different expansion rates can lead to scaling problems.
• Carriage 18 moves along a guide system 32 that is not perfect in form.
• Guide system 32 can include various suitable guide tracks and guided members that can include sliding or rotational moving bearing elements. Imperfections can be present even when high precision components are used. Mechanical factors such as play between the guided members and the guide tracks, the straightness of the guide tracks, and sag in support 20 can lead to imaging imperfections.
• Yawing movements of carriage 18 can arise for numerous reasons including play in guide system 32. Further, imperfections in other components can lead to sub-scan deviations.
• transmission member 33 can comprise a precision lead screw, which can have slight pitch irregularities at various points along its length. Pitch irregularities can cause sub-scan distortions in the formed images.
• recording media 17B is positioned in a random first orientation 50A on media support 12 and various image forming parameters of recording head 16 are adjusted to accommodate the random orientation.
• adjustments to the image forming parameters can include activation timings or adjustments to an inclination of recording head 16 relative to sub-scan axis 24.
• various sensors are employed to detect various points on various edges of recording media 17B to determine an orientation thereof.
• recording media 17B is positioned with a first orientation 50A such that first edge 35 A extends along a direction that is substantially parallel to sub-scan axis 24. In other example embodiments, recording media 17B is positioned with a first orientation 50A such that first edge 35 A extends along a direction that is skewed relative to sub-scan axis 24.
• recording apparatus 10 is operated to form at least one image feature on recording media 17B while recording media 17B is positioned with first orientation 50A.
• the at least one image features includes first image feature 60 which comprises a form suitable for determining the presence of image distortion that may require a change in a calibration of recording apparatus 10.
• first image feature 60 comprises a form suitable for determining the presence of main-scan image distortion that may have arisen after a previous calibration of recording apparatus 10.
• recording apparatus 10 be operated to form an elongate first image feature 60 that extends along a direction substantially parallel to sub-scan axis 24.
• various activations timing and movement corrections as established in a previous calibration e.g.
• first image feature 60 is formed during the formation of first image feature 60 to correct for image distortions that were previously identified.
• Recording apparatus 10 can be operated in various manners to form first image feature 60.
• various portions of first image feature 60 can be formed during a plurality of helical scans produced with a coordinated movement of both media support 12 and recording head 16.
• various portions of first image feature 60 can be formed during a plurality of ring- like or circular scans, wherein each scan is produced while recording head 16 remains stationary at a fixed sub-scan location and media support 12 is rotated in a main-scan direction.
• image forming techniques can include sub-scan scanning techniques in which media support 12 is maintained in desired main- scan position while recording head 16 is translated along sub-scan axis 24 while forming a portion of first image feature 60.
• first image feature 60 is formed in accordance with image data 37 A in this example embodiment of the invention.
• first image feature 60 is shown comprising a curved form (i.e. exaggerated for clarity) rather than its intended straight elongate form, thereby indicating that new imaging corrections are required. It is understood that the illustrated curved distortion is provided by way of example only and other distorted shapes are possible.
• the distortions in first image feature 60 are to be detected by sensor 52 in step 250.
• one or more sensors 52 are located on support 20 at various sub-scan positions suitable for detecting various image features or portions thereof, hi this example embodiment of the invention, sensor 52 is mounted on carriage 18 in a predetermined alignment with recording head 16.
• Sensor 52 is operable to detect various portions of first image feature 60 as motion system 22 controls the positioning of carriage 18 and media support 12 at locations suitable for the detection of these portions.
• various portions of first image feature 60 can be detected by sensor 52, which is positioned at appropriate detection locations on the path traveled by carriage 18.
• Various encoder/sensor signals provided by motion system 22 can be used to determine a position of carriage 18 relative to portion of first image feature 60.
• information describing a position or orientation of each of the various portions of first image feature 60 is determined by controller 30 from various signals from motion system 22 and sensor 52.
• distortions in first image feature 60 can be caused by a change in a positioning and/or orientation of recording head 16 as recording head 16 is positioned at various locations along a deviated sub-scan movement path during the formation of first image feature 60. This change in the positioning of recording head 16 can be caused by different factors including creep in support 20.
• Figure 8 shows a sensor movement path 54 that is approximately parallel to the shape of the distorted first image feature 60 that was formed when recording media 17B was positioned with first orientation 5OA.
• various portions of first image feature 60 can be detected by sensor 52 as sensor 52 is moved to various locations along sensor movement path 54.
• Various information including main-scan positional information for each detected portion of the distorted first image feature 60 can be provided to controller 30 to identify a position of each of the portions.
• recording media 17B is repositioned on media support 12 to reduce occurrences of the aforementioned detection problems.
• recording media 17B is positioned on media support 12 with a second orientation 50B that is different from the first orientation 50A.
• recording media 17B is positioned on media support 12 with the second orientation 5OB after first image feature 60 has been formed on recording media 17B.
• FIG. 7C prior to the detection of various distortions in first image feature 60, recording media 17 was repositioned on media support 12 such that a second edge 36A was positioned in the vicinity of registration features 25.
• second edge 36 A is an edge of recording media 17B that is transversely aligned to first edge 35 A.
• the second orientation 5OB of recording media 17B on media support 12 represents a rotation of recording media 17B with respect to first orientation 50A.
• this representative rotation is made about an axis that intersects cylindrical surface 13 along a direction that is substantially perpendicular to cylindrical surface 13.
• this representative rotation is approximately 90 degrees while in other embodiments the representative rotation can fall with a range of approximately 85 degrees to 95 degrees.
• Factors such as non-perpendicularity between first edge 35 A and second edge 36A can cause variations in the representative rotation.
• recording media 17B is positioned on media support 12 to allow sensor 52 to successfully detect distortion in first image feature 60.
• second orientation 50B corresponds to a positioning of first image feature 60 at location on media support 12 where undesired deviations in a positioning of sensor 52 can be reduced during the detection of first image feature 60.
• sensor 52 is positioned at a first sub- scan position 56 and media support 12 is moved along a direction of main-scan axis 26 to successively position various portions of first image feature 60 at a location suitable for detection by sensor 52.
• sensor 52 is maintained at the first sub-scan position 56 during the detecting.
• the movement of media support 12 along main-scan axis 26 is less susceptible to deviations than the movement of carriage 18 along sub-scan axis 24 which lead to the distortions in first image feature 60.
• media support 12 is a cylindrical member that is rotationally coupled to support 20 via rotational bearings (not shown).
• Suitable rotational bearings can include various precision deep groove ball bearings, various precision angular contact bearings, and various precision self-aligning bearings, for example. These rotational bearings typically allow for the minor amounts of shaft misalignment that can arise from various changes in recording apparatus 10 that cause the distortions in first image feature 60.
• the movement of media support 12 along main-scan axis 26 is less susceptible to deviations than the movement of recording head 16 along sub-scan axis 24.
• the positioning of recording media 17B with second orientation 50B allows sensor 52 to detect each of the various portions of first image feature 60 as well as the overall distortion in the first image feature 60 itself.
• sensor 52 detects distortions in first image feature 60 by detecting variances in an expected position of each detected portion of first image feature 60. After recording media 17B is positioned according to second orientation 50B, variances in an expected sub-scan position of each portion of first image feature 60 would be detected as media support 12 is rotationally moved to locate each of the image feature portions at location suitable for detection by sensor 52.
• the detected sub-scan positional variances of the various portions of first image feature 60 as positioned according to second orientation 50B are related to the main-scan distortions of the various portions of first image feature 60 as positioned according to first orientation 50A.
• sensor 52 detects distortions in first image feature 60 by detecting sub-scan displacements between various portions of first image feature 60 as each portion is moved within the detectable range of sensor 52.
• the detected sub-scan displacements of the various portions of first image feature 60 as positioned according to second orientation 50B are related to the main-scan displacements of the various portions of first image feature 60 as positioned according to first orientation 50A.
• these sub-scan displacements are referenced to first sub-scan position 56. The presence of a varying displacement between each detected portion of first image feature 60 relative to one another or to first sub-scan position 56 can be used to identify distortions.
• the detected sub-scan displacements are referenced to a detectable reference such as first edge 35 A as positioned according to second orientation 5OB. Since first edge 35 A was aligned with first and second registration features 25A and 25B during the formation of first image feature 60 in step 220, there exists a corresponding alignment between first image feature 60 and first edge 35 A and the detection of a varying spacing between the two can be used to identify the presence of distortion in first image feature 60. Some errors can, however, still be encountered when first edge 35A is itself not straight in form. Many recording media 17 can comprise wavy edges especially when the media are large in size or are made from materials that are not dimensionally stable.
• the detected sub-scan displacements are referenced to a second image feature 62 formed in step 230 in accordance with image data 37B.
• image feature 62 is formed by recording head 16 on recording media 17B which is positioned on media support 12 with an orientation 5OC that is different from the first orientation 50A that was used during the formation of first image feature 60.
• second image feature 62 is an elongate image feature that is adjacently positioned to first image feature 60.
• second image feature 62 comprises substantially a same length as first image feature 60 and is formed such that it extends along a direction that is substantially the same as the direction that first image feature 60 extends along.
• recording media 17B including first image feature 60 and second image feature 62 is shown in an unwrapped or flat orientation in Figure 7F.
• second image feature 62 is formed in an aligned relationship with the two registration points 64 and 66 on first edge 35 A that were employed during the formation of first image feature 60.
• First image feature 60 was previously formed while recording media 17B was positioned with a first orientation 50A that was defined by establishing contact between registration points 64 and 66 and corresponding registration features 25A and 25B. Accordingly, first orientation 50A was such that first image feature 60 was formed in an aligned orientation with the two points of contact.
• a datum line (not shown) between the two points of contact is substantially parallel to sub-scan axis 24 when recording media 17B was positioned with first orientation 50A.
• registration features 25A and 25B can be located on media support 12 in a manner in which a datum line between the points of contact would be skewed with respect to sub-scan axis 24.
• second image feature 62 also be formed in the same alignment with the two registration points 64 and 66 that were previously employed during the formation of first image feature 60.
• second image feature 62 be formed in a manner that reduces the possibility of distortions being formed in second image feature 62.
• second image feature 62 is preferably formed with little or no movement of recording head along sub-scan axis 24.
• orientation 50C employed during the formation of image feature 62 is different from first orientation 50A employed during the formation of first image feature 60.
• orientation 5OC is the same as the second orientation 50B employed during the distortion detection in step 250, while in other example embodiment, orientation 50C is different from second orientation 50B. In this example embodiment, orientation 5OC is such that first edge 35A extends circumferentially around media support 12.
• 7,456, 379 disclose various detection techniques that can be employed to find various points along an edge of a media that extends substantially circumferentially around a drum-like media support.
• various sensors can be used to detect the location of registration points 64 and 66, especially when orientation 5OC is skewed relative to main-scan axis 26.
• sensor 52 is employed to detect the locations of registration points 64 and 66.
• Second image feature 62 can be formed in various manners. In some example embodiments, second image feature 62 is formed while operating recording apparatus 10 to circularly scan over recording media 17B. In other example embodiments of the invention, second image feature 62 is formed while operating recording apparatus 10 to helically scan over recording media 17B. In some example embodiments, image data 37B representative of second image feature 62 is adjusted to account for skew between the main-scan axis 26 and a datum line (again not shown) defined by the two registration points 64 and 66.
• sensor 52 detects distortions in first image feature 60 in step 250 by detecting variances in an expected sub-scan separation between various corresponding portions of first image feature 60 second image feature 62 as each of these corresponding portions are moved within the detectable range of sensor 52. Since second image feature 62 has been formed with substantially the same alignment with registration points 64 and 66 that first image feature 60 was formed with, any variances between the detected sub-scan separations of the corresponding portions are related to the main-scan distortions imparted onto first image feature 60 during its formation. Signals comprising information pertaining to the detected sub-scan separations are provided to controller 30.
• controller 30 is configured to determine distortion information from detection information provided by sensor 52.
• controller 30 is configured to transform the detected sub-scan separation information back to a main-scan reference frame employed in the image-forming actions of step 220. Transformations can be made on the basis of various factors including: the previous location of recording media 17B on media support 12 during the formation of first image feature 60 and the amount and direction of various detected separations.
• controller 30 is configured to transform main-scan positional information regarding the location of various detected distorted regions of first image feature 60 positioned according to second orientation 50B back to a sub-scan reference frame employed in the image-forming actions of step 220.
• Various encoder information provided by motion system 22 can be employed by controller 30 in the determination of various positional information.
• controller 30 is configured to alter activation timing changes in regions of media support 12 corresponding to the distortions, hi this regard, the activation timing of various recording channels 23 are adjusted when recording head 16 is positioned to image portions of a subsequent image in the regions corresponding to the distortions in first image feature 60.
• Media support 12 can comprise size attributes along various ones of main-scan axis 26 and sub-scan axis 24 which impose limitations on the size of a suitable recording media 17B that can be handled in accordance with various embodiments of the present invention. For example, a limited circumferential distance around media support 12 may impose limitations on the size of recording media 17B that can be repositioned between first orientation 5OA and second orientation 50B. Accordingly, in some example embodiments, methods similar to method 200 are practiced at various sub-scan locations of media support 12 to determine imaging corrections of various regions associated with each of those sub-scan locations.
• extension of the first image feature 60 and the additional image feature along a direction that is substantially parallel to sub-scan axis 24 can include minor amounts of skew relative to sub-scan axis 24 when recording media 17B is positioned in the detection orientation.
• Second orientation 50E is different from first orientation 50D and is selected for the detection of any changes between the actual separations between the various image features 63 and their corresponding target separations.
• any detected variances are representative of sub-scan distortions that have manifested themselves within recording apparatus 10.
• Imaging corrections including adjustments in a movement parameter of carriage 18 (e.g. a speed parameter) can be made to compensate for these distortions, hi some example embodiments, adjustments in the positioning of carriage 18 are made at various sub-scan locations corresponding to the distortion regions, hi this example embodiment, speed adjustments to carriage 18 are made at various points along its path of travel, hi this example embodiment, these various points correspond to the position of recording head 16 during the formation of the various distortions. The location of these points can be identified by techniques similar to those incorporated by other described embodiments of the invention. Accordingly carriage 18 may be moved with different speeds at different points along its path of travel.
• changes in an expected separation can be detected between various members of a plurality of image features 63 formed in a single image swath. In some cases, sub-scan distortions may be more prominent across a plurality image swaths rather than within a given image swath.
• at least one image feature 63 is formed during each scan and changes in an expected separation can be detected from image features 63 formed in different image swaths.
• sensor 52 can include any suitable sensor for detecting various distortions in one or more image features.
• sensor 52 can include optical, mechanical and electrical elements.
• sensor 52 includes an image capture device such as a CCD sensor or a CMOS sensor. Image capture sensors having appropriately sized fields of view can be employed to capture images of various portions of an image feature. Various signals from an image capture sensor can be used to define a position of a detected portion of an image feature. Additionally, signals (e.g.

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• Accessory Devices And Overall Control Thereof (AREA)
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