Foot measurement and footwear sizing system

• US 5,128,880 A
• Filed: 05/11/1990
• Issued: 07/07/1992
• Est. Priority Date: 05/11/1990
• Status: Expired due to Term

• Current Assignee: Foot Image Technology Incorporated
• Original Assignee: Foot Image Technology Incorporated
• Inventors: White, Jay P.
• Primary Examiner(s): Lall, Parshotam S.
• Assistant Examiner(s): ZANELLI, MICHAEL J
• Application Number:
  US07/520,592
• Time in Patent Office: 788 Days
• Field of Search: 364/550, 364/413.13, 364/413.14, 364/413.22, 364/522, 364/558, 364/561, 356/2, 356/12, 356/376, 356/357, 356/358, 250/307, 382/16, 382/25, 382/26, 382/28, 358/3, 358/96, 340/723, 340/729, 33/3 R, 33/511, 33/512, 128/779
• US Class Current: 382/165
• CPC Class Codes: A43D 1/025 comprising optical means, e.g. mirrors, photo-electric cells, for measuring or inspecting feet
• CPC Class Codes: A61B 5/1036 Measuring load distribution, e.g. podologic studies
• CPC Class Codes: A61B 5/1074 Foot measuring devices

Abstract

A method is provided for measuring bottom facing surfaces of foot which comprises the steps of placing a foot against a reference surface within the scanning field of the scanner, scanning bottom facing surfaces of a foot, and electronically displaying the scan of the foot bottom facing surfaces on a visual display to produce a scanned foot image articulating distances of portions of the foot bottom facing surface from the reference surface. The electronically displaying step may further include assigning gray scale values to distances articulated to produce a scan foot image comprising more than two gray scale intensities so that a grey scale image with a stereoscopic appearance is provided. Alternatively, the electronically displaying step may include assigning color hues to the distances articulated to produce an image comprising more than two spectral hues so that a color image with a stereoscopic appearance is provided. In addition, a method is provided for measuring bottom facing surfaces of the foot which includes a step of electronically displaying the scan of the foot bottom facing surfaces on a visual display to produce a scan foot image distinguishing regions of the foot bottom facing surface exerting different pressures against the reference surface and assigning grey scale or color values to the foot pressure regions. In addition, a system for topographically mapping bottom facing surfaces of a foot is provided.

Claims

1. A method of measuring and electrically displaying the shape of surfaces of a foot as viewed from below the foot, the method comprising the steps of:

a) placing a bottom surface of a foot against a top of a reference surface within a scanning field of a scanner;

b) activating the scanner to scan surfaces of the foot visible when viewed from below the reference surface;

c) measuring the foot by;

i) optically determining color levels for the portions of the scanned foot having a different color in appearance than other portions of the foot;

ii) optically determining intensity levels for the portions of the scanned foot having a scanned appearance with less light intensity than other portions of the foot; and

iii) assigning distance values to the portions of the scanned foot corresponding to the optically determined color levels and intensity levels of the scanned foot; and

d) electronically displaying and enhancing the scan of the foot surfaces on a visual display to produce a scanned foot shape image showing relative distances from the reference surface of portions of the foot surfaces as viewed from below the foot, and showing the overall shape of the foot surfaces as viewed from below the foot.

2. The method according to claim 1 wherein the measuring step comprises assigning gray scale values to distances from the reference surface to produce a scanned foot image on the visual display comprising more than two gray scale intensities.

3. The method according to claim 2 wherein the assigned gray scale values produce a gray scale image with a stereoscopic appearance.

4. The method according to claim 1 wherein the measuring step comprises assigning color hues to distances from the reference surface to produce an image on the visual display comprising more than two spectral hues.

5. The method according to claim 4 wherein the assigned color hues produce a color image with a stereoscopic appearance.

6. The method of claim 1 further comprising the steps of;

a) in step c) iii) of claim 1, assigning pressure values to the portions of the scanned foot corresponding to the optically determined intensity levels and color levels of the scanned foot; and

b) in step d) of claim 1, electronically displaying and enhancing the scan of the foot surfaces on the visual display to produce a scanned foot shape image distinguishing regions of the foot surfaces exerting different pressures against the reference surface.

7. A method of measuring and electronically displaying the shape of surfaces of a foot as viewed from below the foot, the method comprising the steps of:

a) placing a bottom surface of a foot against a top of a reference surface within a scanning field of a scanner;

b) activating the scanner to scan surfaces of the foot visible when viewed from below the reference surface;

c) measuring the foot by;

i) optically determining color levels for the portions of the scanned foot having a different color in appearance than other portions of the foot;

ii) optically determining intensity levels for the portions of the scanned foot having a scanned appearance with less light intensity than other portions of the foot; and

iii) assigning pressure values to the portions of the scanned foot corresponding to the optically determined intensity levels and color levels of he scanned foot; and

d) electronically displaying and enhancing the scan of the foot surfaces on a visual display to produce a scanned foot shape image distinguishing regions of the foot surfaces exerting different pressures against the reference surface, and showing the overall shape of the foot surfaces as viewed form below the foot.

8. The method according to claim 7 wherein the measuring step comprises assigning gray scale values to foot pressure regions so that foot pressure regions exerting greater pressure against the reference surface than other foot pressure regions are displayed with colors having a greater wavelength then colors corresponding to foot pressure regions exerting relatively less pressure against the reference surface.

9. The method according to claim 7 wherein the measuring step comprises assigning color hues to foot pressure regions so that foot pressure regions exerting greater pressure against the reference surface than other foot pressure regions are displayed with colors having a greater wavelength than colors corresponding to foot pressure regions exerting relatively less pressure against the reference surface.

10. A system for topographically mapping the surfaces of a foot as viewed from below the foot, the system comprising:

a) scanning means for generating foot image data by scanning surfaces of a foot from below a bottom surface of the foot;

b) data processing means logically coupled to the scanning means for receiving the foot image data from the scanning means and for transmitting the foot image data to other system components;

c) measuring means for measuring the foot comprising;

i) optical light shading measuring means for determining color levels for the portions of the scanned foot having an appearance that is different in color than other portions of the foot;

ii) optical light intensity measuring means for determining light intensity levels for the portions of the scanned foot having a scanned appearance with less light intensity than other portions of the foot; and

iii) assigning distance and pressure values to the portions of the scanned foot corresponding to the optically determined color levels and light intensity levels of the scanned foot to derive the foot image data for display by the display means; and

d) display means for receiving, displaying, and enhancing the foot image data so that portions of said foot surfaces which are closer to the scanning means appear in closer three dimensional visual relief in comparison with other portions of the foot surfaces which are relatively distant from the scanning means.

11. The system of claim 10 wherein the display means further displays and enhances the foot image data so that portions of the foot surfaces exerting pressure against the scanning means are displayed such that regions of the foot exerting greater pressure than other regions of the foot are displayed with colors of greater wavelength or gray scale values of greater intensity than the other regions of the foot exerting less pressure.

12. A system for mapping the surfaces of a foot as viewed from below the foot, the system comprising:

a) scanning means for scanning surfaces of a foot from below a bottom surface of the foot when the foot is positioned above a reference surface of the scanning means;

b) measuring means for measuring the foot comprising;

i) optical light shading measuring means for determining color levels for the portions of the scanned foot having an appearance that is different in color than other portions of the foot;

ii) optical light intensity measuring means for determining light intensity levels for the portions of the scanned foot having a scanned appearance with less light intensity than other portions of the foot; and

iii) the measuring means assigning distance and pressure values to the portions of the scanned foot corresponding to the optically determined color levels and light intensity levels of the scanned foot to derive foot image data for display with display means; and

c) display means for receiving and displaying the foot image data so that portions of the foot surfaces which are closer to the reference surface of the scanning means are differentiated from other portions of the foot surfaces which are relatively distant from reference surface of the scanning means, the display means further displaying the foot image data so that portions of the foot which are exert