Use a Reticule of lines / Ronchi Ruling Test Chart, aligned in parallel to the vertical edge of the image. Adjust the camera to the test chart, then record the luminance level at the reticule of lines on the chart. Save the image to your PC, then use an image analysis tool to calculate the luminance ratio at the corners and center of the picture. The ratio needs to be about one percent.
This test verifies the decay in image clarity or sharpness that is caused by the hygienic sheath. With the camera focused on a line chart, record the resolution (in lp/mm) at the center and in each corner of the image. Run this test with the camera illumination off and record the resolution with and without sheaths.
This is a test of the camera lens alignment. Place the camera onto a mirror and align the longest edge parallel to the mirror. Now use a goniometer to measure this alignment in the image. The error is measured in degrees and should be very small (at most about 2 degrees).
For this test, use a pocket USAF Optical Test Pattern with 1Lp/mm depth to check the black and white image for color fringe patterns. There should be no visible Lateral (Transverse) or Longitudinal Chromatic Aberrations.
For this test, use a color chart with sharp, distinct edges between colors. Capture images with and without a sheath at various focal distances. There should be no visible jagged edges in between the colors on any of the images.
For this test, use a USAF 1951 Test Chart with the camera illumination turned off. Get as close as possible to the monitor in order to get the best viewing distance, then record the resolution at the center of the picture and without a sheath (best possible). Record all group/element pairs shown in the table below, which show a sharp differentiation between black and white. The numbers on chart are in Lp/mm.
This test must be performed by someone who can pass the Ishahara test for color blindness (http://www.toledo-bend.com/colorblind/Ishihara.html). Use a Mini Color Checker test chart to compare each color on the viewed image against the color on the chart. Capture images of the color checker chart as well as human teeth and gum images. The colors seen in each image should match the test target and contain no Internal reflections, blooming (spill over), color aliasing (Christmas tree lights), stepping, or compression artifacts.
Use a Depth of Field target to align the camera parallel with it, then remove the target and adjust the focal distance for 50mm (or whatever distance you would like to specify). Cover both camera and mount to eliminate all ambient light, then measure the illumination from the camera using a Lux Meter.
Use the Pocket USAF Optical Test Pattern to record the offset of the test chart to the image center. Calculate the angle or direction of view.Using the diagram below, measure I0, I1, I2. h0, h1. and h2, then calculate the angle of view for the camera’s specified image aspect ratio.
With the camera aligned parallel to the mount, measure the movement in the z-direction (mm-scale) and record the horizontal object field and height z in different focus positions. Calculate angle of view between camera window and object plane at different focus positions. The specification will be some minimum angle in degrees.Align the camera in parallel to an indexed grid chart (as shown)
Pad and barrel distortion must be less than some specified value.
Check focus from about 2 mm to about one meter. The image must be clear and sharp when focused at each tested distance.Capture an image of an object with a known size (like a penny), then measure the height and width of the object on the captured image. Magnification will be specified as some minimum or may be a nominal value with a stated tolerance.