This process happens in milliseconds, allowing thousands of sheets to be processed every hour with a high degree of accuracy. A filled bubble absorbs the light, resulting in a lower value being registered by the sensor.
How Scantron Machines Process Test Sheets: The Technology Behind Optical Mark Recognition
Once aligned, the sheet is pulled through the scanner by a sophisticated paper transport mechanism, similar to that of a high-speed photocopier, which ensures smooth passage without tearing or misalignment. How the System Interprets Marks The system differentiates between a filled bubble and a blank one based on the amount of light that returns to the sensor.
One common method is the detection of "no marks" or multiple marks in a single bubble. Data Processing and Analysis As the sheet moves through the scanning head, a series of light-emitting diodes and photodiodes scan the page horizontally.
How Scantron Machines Detect and Interpret Filled Bubbles
The answer sheet is fed through a scanner that uses a bright light source to illuminate the paper. The Fundamentals of Optical Mark Recognition The operation of a scantron relies on the principle of contrasting light absorption.
More About How does a scantron work
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