Specular Image Capture and Evaluation for Microgloss Uniformity Measurements


The purpose of this experiment was to develop a two-dimensional specular image capture system to quantify print microgloss uniformity for correlation of subjective scores and objective results. Large fov (field of view), on-axis reflection and small fov, off-axis reflection imaging systems were used in analyzing a printed test pattern consisting of Cyan, patterns have been rated for microgloss uniformity. Defects affecting the microgloss uniformity include streaks, graininess and mottle. Polarizers and image subtraction techniques were used to minimize the diffuse signal within the images to be analyzed. The small fov, off-axis images were analyzed for standard deviation of the pixel values within the color patch and maximum and average standard deviation within the print (seven patches). The large fov, on-axis images were analyzed for graininess of the color patch and maximum and average graininess within the print (seven patches). Color dependency was also investigated for both systems. Standard deviation in the small fov system did not correlate well with the microgloss uniformity scores. A statistically significant correlation was found in the large fov system between maximum and average graininess and microgloss uniformity scores.


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