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How We Test for Defective Pixels

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How We Test for Defective Pixels

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The suite of quality assurance tests that Teledyne performs on its cameras includes specifications for identifying and correcting defective pixels - also called white blemish pixel defects - that originate from the camera imager. Defective pixels can occur randomly in any imager and are believed to be caused by natural cosmic radiation. In some cases, an incidence of radiation can damage a pixel and cause it to generate a permanently high charge. As a result, the pixel takes on a permanently lit, or ‘glowing,’ appearance. This damage generally occurs after the sensor is manufactured, particularly during shipping and handling. Defective pixels are sometimes referred to as ‘hot,’ ‘burned’ or ‘bright’ pixels.

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