Last update june 20th, 1997

PICCOLOR Newsletter summer 1997

New functions in picCOLOR basic program:

- Canny edge, Marr-Hildreth operator, zero crossings
- New arithmetic functions for frequency domain
- Gauss band pass filter and Gabor filter for Frequency domain
- Shift pass filters asymmetrically
- New object classification types and operation for cyclic image buffers
- Many subpixel algorithms for edge detection and area calculation
- Pattern matching with crosscorrelation and regression
- Gauss and Laplace pyramid with linear and spline interpolation
- Regression analysis for different data types
- New test images: sin wave, gray ramps, gauss noise
- Image rotation using linear or cubic spline interpolation
- Statistical texture filters with very large kernels
- Display function for 2D- and 3D-data fields (also stereometrically)
- Calibrated gray values for 3D-height- and temperature measurement
- Average and Gauss filter with large kernel up to 15*15
- Automatic load and start MACRO batch program at program start

New functions in 3D/Sequence module:

- Sequence buffer can be used as ring buffer to grab short single events
- Average gray values over sequences for noise reduction

New Interference module:

- Fringe correlation technique (PGM) for fast moving surface measurement
- Phase-Shift, Pseudo-Phase-Shift, Gray-Code, Fourier-technique
- Phase unwrapping, image composition, image correction, 3D-display

Available special modules:

- 3D/Sequence processing
- Interferometrics
- Stereometric measurement and display
- Particle Image Velocimetry / Objekt tracking (PIV/PTV)
- Real Time Processing
- User-Programming in "C"

Planned or Beta version modules with limited functionality:

- Pattern Recognition
- Extended Gray Level (16 Bit)

NEW: Interferometric measurement:

The special module for interferometric measurement implements a series of functions for 3-dimensional geometric measurement of object surfaces with subpixel accuracy. There are different methods of projecting interference or stripe patterns onto the object and to determine the surface from the stripe image. The Fringe Correlation method is a special correlation algorithm for determination of flapping and twist angle of fast rotating helicopter rotor blades. Other techniques are Phase-Shift, Pseudo-Phase-Shift, Gray-Code, and Fourier-technique. While the Phase-Shift and Gray-Code methods are very useful methods for still surfaces having strong surface gradients, the Fourier technique and the Fringe Correlation techniques can be used for fast moving objects or surfaces. For more information please ask for the brochure on "Optical Measurement Techniques for Deflection Determination of Windtunnel Models".

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