Foot measurement and footwear sizing system

• US 5,237,520 A
• Filed: 05/29/1992
• Issued: 08/17/1993
• 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): Teska, Kevin J.
• Application Number:
  US07/891,166
• Time in Patent Office: 445 Days
• Field of Search: 364/550, 364/413.13, 364/413.14, 364/413.22, 364/522, 364/558, 364/560, 364/561, 364/512, 33/512, 33/515, 356/2, 356/12, 356/376, 356/357, 358/3, 358/96, 128/779
• US Class Current: 382/154
• 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

Systems and methods are provided for measuring bottom facing surfaces of a foot which comprise placing the foot against a reference surface, projecting light against the foot, and displaying an image of the foot on a visual display to differentiate relative distances of portions of the foot from the reference surface. In addition, the image differentiates portions of the foot exerting different pressures against the reference surface.

Claims

1. A system for mapping surfaces of a foot, the system comprising:

a) a reference surface permitting viewing of the foot from below a bottom surface of the foot when the foot is positioned above the reference surface;

b) a light source positioned to project light on the bottom surface of the foot;

c) optical measuring means for measuring light reflected off of the foot to determine light intensity levels and color levels of the foot;

d) processing means for converting the optically determined light intensity levels of the light reflected off the foot into distance values representing distances of the foot from the reference surface; and

the processing means further converting the optically determined color levels of the light reflected off of the foot into pressure values representing pressures exerted by the foot on the reference surface; and

e) display means for displaying the distance values so that portions of the foot surfaces which are closer to the reference surface are differentiated from other portions of the foot surfaces which are relatively distant from the reference surface, the display means further displaying the pressure values so that portions of the foot surfaces which are exerting greater pressure against the reference surface are differentiated from other portions of the foot surfaces which are exerting less pressure against the reference surface.

2. The system of claim 1, wherein the display means further displays the distance values so that portions of the foot surfaces which are closer to the reference surface appear in closer three dimensional visual relief in comparison with other portions of the foot surfaces which are relatively distant from the reference surface.

3. The system of claim 2, wherein the display means further displays the pressure values so that portions of the foot surfaces which are exerting greater pressure against the reference surface appear in closer three dimensional visual relief in comparison with other portions of the foot surfaces which are exerting less pressure against the reference surface.

4. The system of claim 1, wherein the display means further displays the distance values so that portions of the foot surfaces which are closer to the reference surface than other portions of the foot are displayed with colors of greater wavelength or gray scale values of greater intensity than the portions of the foot which are relatively distant.

5. The system of claim 4, wherein the display means further displays the pressure values so that portions of the foot surfaces exerting greater pressure against the reference surface than other portions of the foot are displayed with colors of greater wavelength or gray scale values of greater intensity than the portions of the foot exerting less pressure.

6. A method of measuring the displaying surfaces of a foot, the method comprising the steps of:

a) placing a bottom surface of a foot adjacent a top of a reference surface;

b) projecting light against the bottom surface of the foot;

c) optically measuring light reflected off of the foot to determine light intensity levels and color levels of the foot; and

d) assigning distance values to the optically determined light intensity levels of the foot;

e) assigning pressure values to the optically determined color levels of the foot;

f) displaying the distance values to show relative distances from the reference surface of different portions of the foot surfaces; and

g) displaying the pressure values to show relative pressures exerted against the reference surface by different portions of the foot surfaces.