
Lengthwise Shrink
Shrinkage as measured from the top line of the top sprocket to the bottom line of the bottom sprocket.
For each detected frame in an inspection…
- Get the measurement of the top perf height (lp1h)The height of the top left perf in pixels, used to calculate the height in millimeters in Waypoint. and compare that to the full-width (fw1)Measurement of the width of the film in line with the top edge of the top left perforation.measurement
- Create a percentage of perf/frame ratio based on the above value
- Store result
- Get the highest value count of the percentages and call that the median
- Set a floor and ceiling based on ITEM 2 for non-stretch/non-shrink range
- Count all frames that are below the floor as shrink and compare to a count of all frames
Lengthwise Stretch
Stretch as measured from the top line of the top sprocket to the bottom line of the bottom sprocket.
For each detected frame in an inspection…
- Get the measurement of the top perf height (lp1h)The height of the top left perf in pixels, used to calculate the height in millimeters in Waypoint and compare that to the full-width (fw1)Measurement of the width of the film in line with the top edge of the top left perforation.measurement
- Create a percentage of perf/frame ratio based on the above value
- Store result
- Get the highest value count of the percentages and call that the median
- Set a floor and ceiling based on ITEM 2 for non-stretch/non-shrink range
- Count all frames that are above the ceiling as stretch and compare to a count of all frames
Lateral Shrink
Lateral Stretch
Stretch as measured from the outer line of the left sprocket to the outer line of the right sprocket.
For each detected frame in an inspection…
- Get the measurement of the top perf width (lp1w)The width of the top left perf in pixels, used to calculate the width (in millimeters) in Waypoint. and compare that to the full-width (fw1) Measurement of the width of the film in line with the top edge of the top left perforation.measurement
- Create a percentage of perf/frame ratio based on the above value
- Store result
- Get the highest value count of the percentages and call that the median
- Set a floor and ceiling based on ITEM 2 for non-stretch/non-shrink range
- Count all frames that are above the ceiling as stretch and compare to a count of all frames
Vertical Perf Distortion
Horizontal Perf Distortion
The distortion of the width of perforations.
- Get the highest value count of perf height (lp1w)The width of the top left perf in pixels, used to calculate the width (in millimeters) in Waypoint.
- Set a floor and ceiling based on ITEM 1 for non-distorted value range
- Count all values outside of ITEM 2 range and compare to a count of all frames
CSV Terminology

id
The frame number as photographed by the FI-16 operator without reference to the keycode or other physical synchronization or start markers.
created
The date the photographs were taken.
status
error
parentid
The reel ID as determined by the user/FI-16 operator. If multiple inspections of one film take place, all inspections would all fall under the same reel ID.
trackerx
Finds the top of perf x and marks it as the beginning of the investigation so that Polaris/Waypoint only uses that point up to tracker y as the basis for analysis so that the same artifact is not counted twice.
trackery
Finds the top of perf y and marks it as the end of the investigation so that Polaris/Waypoint only uses that point from tracker x to tracker y as the basis for analysis so that the same artifact is not counted twice.
lp1h
The height of the top left perf in pixels, used to calculate the height in millimeters in Waypoint.
lp2h
The height of the bottom left perf in pixels, used to calculate the height (in millimeters) in Waypoint.
lp1w
The width of the top left perf in pixels, used to calculate the width (in millimeters) in Waypoint.
lp2w
The width of the bottom left perf in pixels, used to calculate the width (in millimeters) in Waypoint.

rp1h
The height of the top right perf in pixels, used to calculate the height (in millimeters) in Waypoint.
rp2h
The height of the bottom right perf in pixels, used to calculate the height (in millimeters) in Waypoint.
rp1w
The width of the top right perf in pixels, used to calculate the width (in millimeters) in Waypoint.
rp2w
The width of the bottom left perf in pixels, used to calculate the width (in millimeters) in Waypoint.
fw1
Measurement of the width of the film in line with the top edge of the top left perforation.
fw2
Measurement of the width of the film in line with the bottom edge of the top left perforation.
fw3
Measurement of the width of the film in line with the top edge of the bottom left perforation.
fw4
Measurement of the width of the film in line with the bottom edge of the bottom left perforation.
edge 1
The change in the left edge of the film in pixels per photograph. The edge of the plastic is indicated by a green line in the picture above. The blue boxes surrounding the edge line are tracking how much the edge line varies from nominally straight.
edge 2
The change in the right edge of the film in pixels per photograph. The edge of the plastic is indicated by a green line in the picture above. The blue boxes surrounding the edge line are tracking how much the edge line varies from nominally straight.