Patent Publication Number: US-2013253337-A1

Title: Automated assessment of skin lesions using image library

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application is a continuation application of U.S. patent application Ser. No. 13/674,848, filed Nov. 12, 2012, entitled “Automated Assessment of Skin Lesions Using Image Library,” attorney docket number 081672-0026; which is a continuation application of U.S. patent application Ser. No. 12/475,412, entitled “Automated Assessment of Skin Lesions Using Image Library” filed May 29, 2009 (now U.S. Pat. No. 8,330,807, issued Dec. 11, 2012, attorney docket number 081672-0024. the entire content of which is incorporated herein by reference. 
    
    
     BACKGROUND 
     1. Technical Field 
     This disclosure relates to the assessment of skin lesions. 
     2. Description of Related Art 
     Some patients are hesitant to seek the advice of a physician about a skin lesion. These patients may not believe that the skin lesion is of sufficient importance to warrant the cost and/or inconvenience of visiting a physician, or the potential embarrassment of the examination. Sometimes, these decisions not to seek medical advice can result in a harmful skin lesion not being diagnosed in a timely manner. 
     Automated devices have been created which provide a patient with an automated assessment of a skin lesion, without the need for an examination by a physician. Such devices use image-recognition techniques to identify features in the lesions which may or may not be indicative of a problem. Unfortunately, these assessments may not be accurate and the algorithms which these devices employ may be difficult to update with later-discovered improvements in analytical approaches which are taken. 
     SUMMARY 
     An automated skin lesion assessment system may automatically assess a suspect skin lesion. An electronic image library may contain diagnosed skin lesion image data representative of images of a plurality of diagnosed skin lesions and, for each, a diagnosis of the skin lesion. An image capture system may capture an image of the suspect skin lesion. A computer processing system may compare the image of the suspect skin lesion with the diagnosed skin lesion image data and, based on this comparison, identify one or more diagnosed skin lesions which match the suspect skin lesion. A user interface may report the diagnoses of the diagnosed skin lesions that match the image of the suspect skin lesion. 
     The computer processing system may determine that a diagnosed skin lesion matches the suspect skin lesion by determining that the diagnosed skin lesion has a threshold level of similarity to the suspect skin lesion. 
     The computer processing system may determine that a diagnosed skin lesion matches the suspect skin lesion by comparing a plurality of features of the skin lesions. The compared features may include at least two or four of the following: size, color, degree of color uniformity, shape, edge smoothness, and location. The computer processing system may determine that a diagnosed skin lesion matches the suspect skin lesion by giving a different weight to similarities between at least two of the features. 
     The user interface may report only a single diagnosis. The user interface may report the most frequent diagnosis among the matches made by the computer processing system or the diagnosis of the diagnosed skin lesion which most closely matches the suspect skin lesion. 
     The user interface may report a plurality of diagnoses, such as the diagnoses of the diagnosed skin lesions which match the suspect skin lesion. 
     The user interface may report information indicative of the quantity of matching diagnosed skin lesions which had each reported diagnosis. The quantity may be reported as a percentage of all of the matching diagnosed skin lesions. 
     The image capture system may include a camera configured to capture the image of the suspect skin lesion, a lens configured to focus an image of the skin lesion on the camera, a housing containing the camera and the lens and configured to block external light from illuminating the suspect legion while the camera captures the image of the suspect skin lesion, and an illumination system within the housing and configured to illuminate the suspect skin lesion while the camera captures the image of the suspect skin lesion. 
     The housing may be configured to insure that the lens of the camera is a fixed distance from the skin lesion when the skin lesion is placed against a front opening of the housing. 
     The housing may have a cone-like shape. 
     A handle may be attached to the housing. An electronic switch may be in the handle and, when activated, cause the image of the suspect skin lesion to be captured. 
     A protective annulus may be detachably connected to a front opening of the housing so as to prevent the housing from coming in contact with the suspect skin lesion. 
     The illumination system may include one or more LEDs. The LEDs may emit white light or a monochromatic light. 
     The illumination system may be positioned behind the lens. 
     These, as well as other components, steps, features, objects, benefits, and advantages, will now become clear from a review of the following detailed description of illustrative embodiments, the accompanying drawings, and the claims. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
       The drawings disclose illustrative embodiments. They do not set forth all embodiments. Other embodiments may be used in addition or instead. Details that may be apparent or unnecessary may be omitted to save space or for more effective illustration. Conversely, some embodiments may be practiced without all of the details that are disclosed. When the same numeral appears in different drawings, it is intended to refer to the same or like components or steps. 
         FIG. 1  is a block diagram of a system which captures skin lesion images and diagnoses of them. 
         FIG. 2  illustrates a computer display window which displays a skin lesion being captured by a skin lesion image capture device. 
         FIG. 3  is an example of a system which captures skin lesion images and diagnoses of them. 
         FIGS. 4(   a )- 4 ( c ) illustrate a protective annulus that may be used with the skin lesion image capture system illustrated in  FIG. 2 . 
         FIG. 5  is a block diagram of a system which automatically assesses a suspect skin lesion. 
         FIG. 6  illustrates a computer display window which displays an automated assessment of a suspect skin lesion. 
     
    
    
     DETAILED DESCRIPTION OF ILLUSTRATIVE EMBODIMENTS 
     Illustrative embodiments are now discussed. Other embodiments may be used in addition or instead. Details that may be apparent or unnecessary may be omitted to save space or for a more effective presentation. Conversely, some embodiments may be practiced without all of the details that are disclosed. 
     Two types of systems will now be described. The first system may be used to capture images of skin lesions which have been diagnosed and the diagnoses of them. The second system may provide an analysis of a suspect skin lesion based on a comparison of the suspect skin lesion with this captured data. 
       FIG. 1  is a block diagram of a system which captures skin lesion images and diagnoses of them. 
     As illustrated in  FIG. 1 , a diagnosis and skin lesion image capture system  101  may include an image capture device  103 , a computer processing system  105 , and a user interface  107 . 
     The image capture device  103  may be configured to capture an image of the suspect skin lesion. The image capture device  103  may be configured to ensure consistency and uniformity among the images which are captured. For example, the image capture device  103  may be configured to ensure that the intensity and spectral distribution of the light which illuminates each skin lesion when its image is being captured is always substantially the same. Similarly, the image capture device  103  may be configured to ensure that differences in the size of skin lesions in the images are representative of actual differences in the size of the skin lesions, not merely changes in image scale. 
     Any type of image capture device may be used for the image capture device  103 . One example of such a device is illustrated in  FIG. 2  and is discussed below. 
     The user interface  107  may be configured to interface with a physician or other user of the diagnostic and skin lesion image capture system  101 . The user interface  107  may be configured to allow the user to enter information about the patient whose skin lesion is being imaged, such as the name of the patient, the patient&#39;s date of birth, and the patient&#39;s address. The user interface  107  may be configured to allow information about the lesion to be entered, such as the general location of the lesion on the patient&#39;s body. 
     The user interface  107  may be configured to allow the user, such as a physician, to enter a diagnosis of the skin lesion. To facilitate this, the user interface  107  may be configured to provide a list of possible diagnoses and to require the user to select the most appropriate one. In the event of uncertainty about the diagnosis, the user interface  107  may be configured to allow the user to enter more than a single diagnosis. 
     The user interface  107  may be configured to allow the user to select one or more of the diagnoses by utilizing a hierarchical menu. The user interface  107  may in addition or instead be configured to allow the user to enter a diagnosis without selecting it from a list, such as by typing it in or by stating it verbally. 
     The user interface  107  may be configured to assist the user during the process of capturing an image of the skin lesion. For example, the user interface  107  may include a display which displays the image of the skin lesion which is being captured by the image capture device  103  in real time. This may enable the user to verify that the image is being faithfully captured. It may also enable the user to adjust the image capture device  103  so as to cause the image of the skin lesion to be positioned at the center of its capture frame. 
       FIG. 2  illustrates a computer display window which displays a skin lesion being captured by a skin lesion image capture system. As illustrated in  FIG. 2 , the display may depict a skin lesion  201  which is being captured by the image capture device  103  within a window  203 . The window  203  may include crosshairs  205  positioned at approximately at the center of the image capture frame. The user may adjust the position of the image capture device  103  while viewing the image which it is capturing in the window  203  until such time as the skin lesion  201  appears to be centered within the crosshairs  205 , as illustrated in  FIG. 2 . The user interface  107  may in addition or instead provide other forms of communication that may assist the user in adjusting the position of the image capture device  103 . 
     The user interface  107  may be configured to display information about the skin lesion which is being captured, such as information about its size. The user interface  107  may be configured to display other information, such as the patient&#39;s name, date of birth, the location of the skin lesion, and/or the diagnosis which a physician has provided about the skin lesion. 
     The user interface  107  may include any type of user interface device. For example, the user interface  107  may include one or more displays, touch screens, keyboards, mice, sound systems, and/or printers. When a printer is provided, the user interface  107  may be configured to print some or all of the information which it displays, as well as additional information that may be of interest. For example, the user interface  107  may be configured to print an image of the skin lesion which the physician may place in the patient&#39;s medical file. The printed image may be marked with patient-identifying information, the physician&#39;s diagnosis, size information about the lesion, and/or with any other information. 
     The computer processing system  105  may be configured to cause the diagnosis and skin lesion image capture system  101  to perform each of the functions which have been described herein in cooperation with the image capture device  103  and/or the user interface  107 . 
     The computer processing system  105  may be configured to cause the diagnosis and skin lesion image capture system  101  to perform other functions. For example, the computer processing system  105  may be configured to process image data from the image capture device  103  to correct for any spatial distortion in the image data which is delivered. For example, the image capture device  103  may use a wide-angle lens which may introduce barrel distortion caused by uneven magnification between the edges and center of the lens. Horizontal and vertical lines may appear to be bent outwards toward the edges of the image. The computer processing system  105  may be configured to apply algorithms to correct for this barrel distortion, such as algorithms of the type described in Mundhenk, T. N., et al., “Techniques for fisheye lens calibration using a minimal number of measurements,” Proceedings of the SPIE, SPIE-Int. Soc. Opt. Eng., 4197, pp. 181-90, 2000, and e.g. James P. Helferty, et al., “Videoendoscopic Distortion Correction and Its Application to Virtual Guidance of Endoscopy,” IEEE Transactions on Medical Imaging, Vol. 20, No. 7, pp 605-617, 2001, the entire contents of both of which is incorporated herein by reference. 
     The computer processing system  105  may include any type of computer processing components. For example, the computer processing system  105  may include one or more processors, memory devices, operating systems, application programs, and/or other computer hardware and/or software. 
     The computer processing system  105  may be at the same location as the image capture device  103  and/or the user interface  107 , or it may be at a location that is remote from one or both of them. For example, the computer processing system  105  may be at a website which is being hosted at a remote server. In such a configuration, the image capture device  103  and the user interface  107  may be configured to communicate with the computer processing system  105  over a computer network. For example, the image capture device  103  and the user interface  107  may be part of a remote client workstation which communicates with the computer processing system  105  at a remote website over the internet. 
     The computer processing system  105  may be configured with one or more memory devices, such as one or more hard disk, CD&#39;s, DVD&#39;s, and/or flash memories, that store image data that is received from the image capture device  103  and that diagnoses and other information received from the user interface  107 . 
     The computer processing system  105  may in addition or instead be configured to deliver image data which is received from the image capture device  103 , as well the diagnoses and other information which are received from the user interface  107 , to a remote location. At such remote location, information received from the computer processing system may be stored in a database, along with similar types of information received from other diagnosis and skin lesion image capture systems, and/or from other sources. The computer processing system  105  may be configured to deliver this information by any means, such as by burning a CD and/or DVD which may be physically delivered to the remote location, and/or by transmitting the information through any means, such as through a wired and/or wireless network communication system, such as over the internet. 
       FIG. 3  is an example of a system which captures skin lesion images and diagnoses of them. As illustrated in  FIG. 3 , the system may include an image capture device  301  which may be connected to a laptop  323 . The image capture device  301  may be configured to provide any one or more of the functions of the image capture device  103  that is illustrated in  FIG. 1  and discussed above. Similarly, the laptop  323  may be configured to provide any one or more of the functions of the computer processing system  105  and the user interface  107  that are illustrated in  FIG. 1  and discussed above. The diagnosis and skin lesion image capture system  101  in  FIG. 1  may also be implemented with different components. 
     The image capture device  301  may include a camera  305 , a housing  307  having a front opening  308 , a lens  309 , an illumination system  311 , a handle  313 , an electronic switch  315 , and a protective annulus  317 . 
     The camera  305  may be of any type. The camera  305  may an electronic camera and configured to capture a clear, high resolution, color, electronic image or a skin lesion. For example, the camera  305  may be a CCD camera having at least 3 megapixels. The camera  305  may be small and light. 
     As illustrated in  FIG. 3 , the camera  305  may be mounted at the rear of the housing  307 . The distance between the camera  305  and the front opening  308  of the housing  307  may be too short to allow the camera  305  to focus on an accurate image of a skin lesion that is placed up against the front opening  308  of the housing  307 . To assist the camera  306 , the lens  309  may be placed in front of the camera  305 . The lens  309  may be configured to focus the image of a lesion which is placed up against the front of the housing  307  on the camera  305 . For example, the lens  309  may be a wide angle lens, such as a fisheye lens. The fisheye lens may have a wide field-of-view, such as a field-of-view between 140 and 160 degrees. 
     The housing  307  may be of any configuration and be made of any material. For example, the housing  307  may be made of an opaque material, such as an opaque plastic. The housing  307  may be configured to block external light from illuminating a skin lesion while the camera  305  captures an image of the skin lesion. 
     The housing  307  may be configured to ensure that the camera  305  is always the same distance from the front opening  308  of the housing  307 . To facilitate this functionality, the housing  307  may be approximately in a cone-like shape, as illustrated in  FIG. 3 . 
     The front opening  308  of the housing  307  may have a diameter which is large enough to fully encompass the largest skin lesion which may be imaged. The front opening  308  may also have a diameter that is small enough so that all portions of the front opening  308  can come in contact the patient&#39;s skin, even when the skin has some curvature, such as when the skin is covering a forearm. This may ensure that ambient light does not seep within the interior of the housing  307 . For example, the front opening  308  may have a diameter of between ½ and 3 inches. The front opening  308  may instead be configured to have an adjustable diameter. Alternately, the front opening  308  may be configured to receive one of several different-sized adapters, so as to allow its diameter to be selected by the user. 
     The handle  313  may be attached to the housing  307 , as illustrated in  FIG. 3 . It may be shaped and positioned so as to enable a user to easily place the front opening  308  of the housing  307  up against the skin of a patient and to easily adjust the precise position of the front opening  308  so that the skin lesion which is being imaged is positioned approximately within the center of the front opening  308 , as illustrated in  FIG. 2 . During this positioning process, the camera  305  may be configured to continually capture images of the skin lesion and to deliver them to the laptop  323  over a cable  321 , so that the user can see the effects of movements of the image capture device  301  in real time. 
     The electronic switch  315  may be positioned to be easily activated by one or more fingers of the user. The user may actuate the electronic switch  315  at such time as the image capture device  301  has been properly positioned over the skin lesion, such as when a display window of the type illustrated in  FIG. 2  indicates that the skin lesion is positioned against and approximately within the center of the front opening  308 . This may cause an image of the skin lesion to be permanently captured by the camera  305  and/or by the laptop  323 . 
     The illumination system may be located within the housing  307  and may be configured to cast illuminating light on a skin lesion which is placed against and within the front opening  308 . The illumination system  311  may be positioned behind the lens  309  of the camera  305 , so as to prevent light from the illumination system from directly impinging upon the lens  309 . 
     The illumination system  311  may be of any type. The illumination system  311  may be configured to provide illumination having an intensity and spectral distribution which remains constant throughout the use of the image capture device  301 . For example, the illumination system  311  may include one or more LED&#39;s. One or more of these LED&#39;s may be of the miniature surface mount (SMD) type. The LED&#39;s may be configured to emit a white light, a monochrome light at a particular frequency, or light having any other type of spectral distribution. The intensity of the light from the illumination system  311  may be such as to fully illuminate a broad variety of skin lesions which are placed against and within the front opening  308 , without saturating any portion of the images of these skin lesions which are captured by the camera  305 . 
     In some embodiments, the intensity and/or spectral distribution of the illumination source  311  and/or the exposure of the camera  305  may be adjustable. These adjustments may be made manually by the user and/or automatically by the camera  305  and/or the computer processing system  105 , based on the images which are captured by the camera  305 . When adjustments are permitted, information about these adjustments may be automatically provided by or to the computer processing system  105  or manually entered through the user interface  107 . Information about these adjustments may be delivered to the remote location for entry in the database, along with the other information about each captured image. 
     The protective annulus  317  may be configured as a bio isolator to protect the housing  307  from contact with the skin lesion or any other part of the patient. The protective annulus  317  may be made of any material and may be of any shape. For example, it may be made of a soft cushioning material, so as to aid in making a tight light seal and so as to feel comfortable to the patient. It may be circular. 
       FIGS. 4(   a )- 4 ( c ) illustrate a protective annulus that may be used with the skin lesion image capture system illustrated in  FIG. 2 . The protective annulus  317  illustrated in  FIG. 3  may be of the type illustrate in  FIGS. 4(   a )- 4 ( c ) or of any other type. 
     As illustrated in  FIG. 4 , the protective annulus  317  may be configured to snap onto the front opening  308  of the housing  307 . Thereafter, the protective annulus  317  may be configured to be released from the front opening  308  of the housing  307  through the actuation of an annulus release button  325 . After use, the protective annulus  317  may be cleaned or discarded and replaced with a new one before the next use of the image capture device  301 . 
     The image capture device  301  may communicate information to the laptop  323  through any means, such as through the cable  321  and/or through a wireless connection, such as a blue tooth connection. A USB cable connection may be provided which may also provide electrical power to the image capture device  301 , including the camera  305  and/or the illumination source  311 , 
     A physician or other user may use the diagnosis and skin lesion image capture system  101 , such as the embodiment illustrated in  FIG. 3 , to capture images of skin lesions on patients, as well as the diagnoses which the physician or other person has made of these skin lesions. To do so, the physician or other user may follow one or more of the capture procedures which have been discussed above, or any other procedure. 
     In one embodiment, all of the captured images may be captured under substantially identical lighting conditions. Thus, any differences in the color or texture of captured images may be solely attributable to actual color or texture differences. Similarly, all of the captured images may be captured with substantially the same zoom settings and distances between the skin lesions and the lens of the camera. Thus, any differences in the size of the lesions within each image may be solely attributable to actual sized differences. 
     Physicians and others may be induced to utilize the diagnosis and skin lesion image capture system  101  and/or others systems like it. Physicians and others may also be induced to provide the images and diagnoses which these systems capture to a remote location for entry in a common database. They may be induced to do so by the inclusion of a printer and/or other output device which may be configured to enable the physicians and other users to use the gathered information for the purpose of diagnosing their own patients. The diagnoses and skin lesion image capture system  101  may also be configured to enable the physician to recall such information during subsequent patient visits, thereby supplementing the information which the physician may have for future diagnoses. 
       FIG. 5  is a block diagram of system which automatically assesses a suspect skin lesion. As illustrated in  FIG. 5 , an automated skin lesion assessment system  501  may include an image capture device  503 , an electronic image library  505 , a user interface  507 , and a computer processing system  509  which may include an image matching subsystem  511 . 
     The electronic image library  505  may be of any type. For example, the electronic image library may contain diagnosed skin lesion image data which is representative of images of a plurality of diagnosed skin lesions. The diagnosed skin lesion image data may include the diagnosis of each diagnosed skin lesion. 
     The diagnosed skin lesion image data which is contained within the electronic image library  505  may include images of various diagnosed skin lesions, all under substantially the same lighting conditions and all at substantially the same zoom levels and separation distances from the camera lens. If there is any variation among the lighting conditions, zoom levels, or separation distances, details about these variations may also be included. 
     The diagnosed skin lesion image data may include images of a wide variety of skin lesions, illustrative of a wide and comprehensive variety of skin lesion types and problems, including all of the most common skin lesion types and problems. For each diagnosis which is contained within the diagnosed skin lesion image data, there may be one, two, or several images of different diagnosed skin lesions with the same diagnosis. 
     The electronic image library  505  may include one or more electronic memories on which the diagnosed skin lesion image data may be recorded, such as one or more hard disk drives, CD&#39;s, DVD&#39;s, and/or flash drives. These memories may be in the same location as one or more of the other components of the automated skin lesion assessment system  501  and/or may be located remotely therefrom, in whole or in part. For example, the electronic image library  505  may be located at a centralized website which may be accessed by the other components of numerous automated skin lesion assessment systems of the type illustrated in  FIG. 5 . Through such centralization, updates to the electronic image library  505  may be readily made, without having to update each automated skin lesion assessment system  501  which may be in use. Alternatively, each automated skin lesion assessment system  501  may have its own electronic image library  505  and updates to this library may be provided through any means, such as through a computer network, such as the internet, and/or through CD&#39;s, DVD&#39;s, and/or flash memories. 
     The diagnosed skin lesion image data which is contained within the electronic image library  505  may come from any source. For example, it may come from diagnosis and skin lesion image capture systems of the type illustrated in  FIG. 1  and discussed above. 
     The image capture device  503  may be configured to capture an image of a suspect skin lesion. The image capture device  503  may be any of the types of image capture devices that are discussed above in connection with the image capture device  103 , such as the image capture device  301  illustrated in  FIG. 3 . The image capture device  503  may instead be of a different type. In either event, the image capture device  503  may be configured to generate images of a suspect skin lesion under the same illumination conditions, zoom level, and camera separation distance as was the diagnosed skin lesion image data in the electronic image library. In an alternate embodiment, the illumination, zoom level, and/or separation distance may be different, in which case information about these differences may be taken into consideration during the matching process described below. 
     The user interface  507  may be configured to assist the user in capturing an image of the suspect skin lesion while using the image capture device  503 . It may be configured to do so in the same way as is discussed above in connection with the user interface  107 . For example, the user interface  507  may be configured to display a window displaying the captured image of a suspect lesion while the user adjusts the position of the image capture device  503  to bring the suspect skin lesion within the center of its field of view, just like what is illustrated in  FIG. 2  and discussed above. The user interface  507  may be configured to receive information from the user, such as information about the identity of the user, the location of the suspect skin lesion, and/or any type of information. 
     Unlike the user interface  107 , however, the user interface  507  may not be configured to receive any diagnosis of the suspect skin lesion. In certain embodiments, the user interface  507  may also not be configured to receive any information identifying the patient. 
     The user interface  507  may be configured to report the diagnoses of the diagnosed skin lesions that match the image of the suspect skin lesion. Information about these matches may come from the computer processing system  509  as is described below in more detail. This report may be provided in any form. For example, the report may be provided on a display, in a printout, over a sound system, or in an e-mail. 
     The content of such a report may vary. In one embodiment, the report may provide only a single diagnosis. In this embodiment, the single diagnosis may be the most frequent diagnosis among the matches made by the computer processing system  509 . In another embodiment, the single diagnosis may be the diagnosis of the diagnosed skin lesion which best matches the suspect skin lesion. 
     In another embodiment, the report may provide a plurality of diagnoses. In one embodiment, the diagnoses may be the diagnoses of all of the diagnosed skin lesions which match the suspect skin lesion. The report which may include information indicative of the quantity of matching diagnosed skin lesions which had each reported diagnosis. This quantity may be reported as a percentage of all of the matching diagnosed skin lesions. 
       FIG. 6  illustrates a computer display window which displays an automated assessment of a suspect skin lesion. As illustrated in  FIG. 6 , the user interface  507  may display a skin lesion assessment window  601  which may report all of the diagnoses that were made for the diagnosed skin lesions which match the suspect skin lesion. As reflected in  FIG. 6 , each reported diagnosis may include the percentage of matching diagnosed skin lesions which had that diagnosis. 
     The user interface  507  may be configured to provide other information to a user, such as information explaining the results which have been reported and urging the user to seek professional care, as also illustrated in  FIG. 6 . The user interface  507  may be configured to provide referrals to dermatologists that may be near the user. A dermatologist may, in turn, pay a fee to be given such referrals. 
     The user interface  507  may include one, some, or all of the components which are discussed above in connection with the user interface  107 . For example, the user interface  507  may include one or more displays, keyboards, mice, touch screens, sound systems, printers, and/or any other type of user interface device. 
     The computer processing system  509  may be of any type. For example, the computer processing system  105  may include one or more processors, memory devices, operating systems, application programs, as well as any of the other components discussed above in connection with the computer processing system  105 . 
     The computer processing system  509  may be configured to cause the automated skin lesion assessment system  501  to perform each of the functions which have been described herein in cooperation with the image capture device  503 , the electronic image library  505 , and/or the user interface  507 . For example, the computer processing system  509  may be configured to compare the image of the suspect skin lesion which is generated by the image capture device  503  with the diagnosed skin lesion image data which is contained within the electronic image library  505 . Based on this comparison, the computer processing system  509  may be configured to identify one or more diagnosed skin lesions which match the suspect skin lesion. 
     The computer processing system  509  may include an image matching subsystem  511 . The image matching subsystem  511  may assist the computer processing system  509  in identifying these matches. 
     The image matching subsystem  511  may be configured to identify these matches using any approach. For example, the image matching subsystem  511  may be configured to determine that a diagnosed skin lesion matches the suspect skin lesion by determining that the diagnosed skin lesion has a threshold level of similarity to the suspect skin lesion. 
     The image matching subsystem  511  may be configured to compare a plurality of features of the suspect skin lesion with the diagnosed skin lesions. The image matching subsystem  511  may be configured to determine that a diagnosed skin lesion matches the suspect skin lesion by determining that one or more of these features of the diagnosed skin lesion has a threshold level of similarity to the suspect skin lesion. The features which may be compared may include size, color, degree of color uniformity, shape, edge smoothness, and/or the location of the lesion. In some configurations, two or more of these features may be compared. In other configurations, four or more of these features may be compared. Other features may be compared in addition or instead. 
     In some cases, the diagnosed skin lesions and the suspect skin lesion will have been imaged under the same lighting conditions and at the zoom level and camera separating distance. In other applications, they may have been captured under different lighting conditions, zoom levels, and/or separation distances. When there are differences, one or more of these image capture parameters may be noted within the diagnosed skin lesion image data that is contained within the electronic image library  505  and accounted for by the image matching subsystem  511  during the matching process. 
     The image matching subsystem  511  may generate a score indicative of the degree to which each compared feature matches. The determination by the image matching subsystem  511  as to whether there is a match may be based upon an analysis of these scores for each potential match which is examined. In some embodiments, similarities between some compared features may be given more weight in the analysis than between other compared features. 
     The image matching subsystem  511  may be configured to select the diagnosed skin lesion which best matches the suspect skin lesion. In alternate embodiments, the image matching subsystem  511  may be configured to select all diagnosed skin lesions which match the suspect skin lesion within a certain pre-determined range. 
     The image matching subsystem  511  may employ any type of image processing technique to facilitate this matching. For example, blob analysis algorithms may be utilized to analyze the area of each skin lesion. Once these regions are identified, the image matching subsystem  511  may calculate selected features of these regions, automatically discarding regions that are not of interest, and may classify remaining regions according to the values of the features. For example, a blob region may be identified by segmenting the image such that the pixels of an object have the same logical state. Regions of touching pixels in this state may be identified as a blob. Pixels not part of a blob may be considered as image background. The segmentation may include intensity thresholding, color thresholding, active contours, region growing and/or level set analysis. Further information about such techniques may be found in Pratt, William K., Digital Image Processing, John Wiley &amp; Sons, New York, 2001, and e.g., Jahne, Bernd, Image Processing for Scientific Applications, CRC Press, New York, 1997, the entire contents of which are incorporated herein by reference. 
     The image matching subsystem  511  may include appropriate image processing software. For example, image processing software that is used in facial recognition may be adjusted to implement one or more of the approaches which have been described herein. 
     Like the electronic image library, the computer processing system  509  may be at the same location as the image capture device  503  and the user interface  507 , or may be located remotely. For example, the computer processing system  509  may be at a remote website which is accessed by the image capture device  503  and/or the user interface  507  through a client station which is connected to the internet. 
     The components, steps, features, objects, benefits and advantages that have been discussed are merely illustrative. None of them, nor the discussions relating to them, are intended to limit the scope of protection in any way. Numerous other embodiments are also contemplated. These include embodiments that have fewer, additional, and/or different components, steps, features, objects, benefits and advantages. These also include embodiments in which the components and/or steps are arranged and/or ordered differently. 
     Unless otherwise stated, all measurements, values, ratings, positions, magnitudes, sizes, and other specifications that are set forth in this specification, including in the claims that follow, are approximate, not exact. They are intended to have a reasonable range that is consistent with the functions to which they relate and with what is customary in the art to which they pertain. 
     All articles, patents, patent applications, and other publications which have been cited in this disclosure are hereby incorporated herein by reference. 
     The phrase “means for” when used in a claim is intended to and should be interpreted to embrace the corresponding structures and materials that have been described and their equivalents. Similarly, the phrase “step for” when used in a claim embraces the corresponding acts that have been described and their equivalents. The absence of these phrases means that the claim is not intended to and should not be interpreted to be limited to any of the corresponding structures, materials, or acts or to their equivalents. 
     Nothing that has been stated or illustrated is intended or should be interpreted to cause a dedication of any component, step, feature, object, benefit, advantage, or equivalent to the public, regardless of whether it is recited in the claims. 
     The scope of protection is limited solely by the claims that now follow. That scope is intended and should be interpreted to be as broad as is consistent with the ordinary meaning of the language that is used in the claims when interpreted in light of this specification and the prosecution history that follows and to encompass all structural and functional equivalents.