Grating projection method for profile measurement using phase-shifting technique.

Shape measurement by the grating projection technique in a microscope

Superfast phase-shifting method for 3-D shape measurement.

Recently introduced DLP Discovery technology allows for tens of kHz binary image switching, which has great potential for superfast 3-D shape measurement. This paper presents a system that realizes 3-D shape measurement by using a DLP Discovery technology to switch binary structured patterns at very high frame rates. The sinusoidal fringe patterns are generated by properly defocusing the projec...

Phase-Shifting Interferometry for RF Phase Measurement

This paper introduces an interferometric technique for the phase measurement of microwave devices. A handheld vector network analyzer (VNA) is presented for HF and VHF applications. A wideband synthesizer with multiple synchronized outputs is developed for extending the frequency range to the microwave band. The phase differences between the output signals can be set digitally with sub-degree a...

Spatial Phase-Shifting Interferential System on Polarization Interference and Grating Beam- Splitting: Phase-Shifting Error Testing

In spatial phase-shifting interferential system on polarization interference and grating beam-splitting, the azimuth errors of the polarizers are the central error sources of phase-shifting steps and have 1:1 effect for the steps. It applies two ways to determine the azimuth errors of the ploarizers: experimental testing and software calculating. The basic principle of experimental testing is t...

Cursive character recognition – a character segmentation method using projection profile-based technique

This paper reports the results of a study on a first sight decision tree algorithm for cursive script recognition based on the use of histogram as a projection profile technique. A postal code image data scanned is converted in a 2-dimension matrix representation to be used with a set of algorithms to provide full range segmentation. The results, based on this approach, are quite satisfactory f...