Algorithm 1: Steps for analyzing urinalysis dipstick video

Initialization

Step 1: Create template image

Step 2: Measure relative offsets between dipstick pads and timing sticker

(a) straighten image

(b) determine offsets

Step 3: Capture and store reference chart data

Analysis

Step 1: Correct aspect ratio of video

if aspect ratio <= 1

then rotate image by 90°

end

Step 2: Identify start time and correct video orientation

for each frame

Calculate normalized cross-correlation (NCC)

if maximum of NCC >= threshold (0.85)

start timer

correct orientation

continue

end

end

Step 3: Record and analyze the results

for each dipstick pad

(a) identify frame for readout time

(b) straighten image

(c) locate dipstick pad and record color

(d) compare measured color to reference chart end

end