| 摘要 |
PURPOSE: A method for automatically inspecting for smudges on a polarizing plate by using color difference analysis is provided to monitor a smudge extent of a polarizing plate in real time in a producing line, thereby enhancing quality management and reducing manufacturing time. CONSTITUTION: A method for automatically inspecting for smudges on a polarizing plate by using color difference analysis is as follows: An inspection polarizing plate or a polarization device is mounted on one or more reference polarizing plates(S100). Lights are irradiated on the inspection polarizing plate or polarization device(S200). The inspection polarizing plate or polarization device are photographed(S300). Color differences of each pixel are calculated by using data extracted from the photographed images. The extent of a smudge is digitized by using the calculated color difference data(S470). [Reference numerals] (S100) Mounting an inspection polarizing plate; (S200) Irradiating lights; (S300) Photographing an inspection polarizing plate; (S400) Quantification of a smudge; (S410) Extraction RGB data and location data; (S420) Data processing; (S421) Converting RGB data into color data, chroma data, and brightness data; (S422) Histogram-equalization processing by extracting brightness data; (S423) Re-converting color data, chroma data, and histogram-equalization processed brightness data into RGB data; (S430) Setting a minute inspection region by using location data; (S440) Chrominance measurement; (S450) Equalization chrominance data with respect to a longitudinal direction; (S460) Calculating amplitude variations on chrominance; (S470) Digitalizing the extent of a smudge
|
