What about correction for optical, mechanical, and pixel vignetting effects? In analog days this kind of shading error was corrected with scaled parabola signals added to the baseband video at horizontal and vertical rates. Gradient shading errors were corrected with scaled saw tooth signals added to the baseband video at horizontal and vertical rates. Feature extraction such as that required for OCR might benefit from shading correction. OCR binarization algorythms attempt to deal with adjacent pixel levels changed due desired feature brightness dealing with both noise and background brightness changes (perhaps due to background artwork). I haven't seen anything about shading correction outside of telecine/live studio video camera enviornments.
What, if anything, is done either in the camera itself or in digital post processing to correct shading errors or, indeed, is shading correction even desirable in computer vision processing?
The company says it anticipates high-definition video for home security and other uses will be the next mature technology integrated into the IoT domain, hence the introduction of its MatrixCam devkit.
Siemens and Georgia Institute of Technology are partnering to address limitations in the current additive manufacturing design-to-production chain in an applied research project as part of the federally backed America Makes program.
Most of the new 3D printers and 3D printing technologies in this crop are breaking some boundaries, whether it's build volume-per-dollar ratios, multimaterials printing techniques, or new materials types.
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