Non-uniqueness of the Color Adaptation Techniques in RGB Photoelasticity

Novel calibration and color adaptation schemes in three-fringe RGB photoelasticity

“…Nevertheless, it can be noticed that fringe order uncertainty in the order of 0-0.25 has been noticed due to color adaptation. These uncertainties produced by the color adaptation schemes have been deliberated in a future communication by the authors [25]. Herein, it can be inferred from the results that a color adaptation process fetches approximate data.…”

“…For demodulating higher fringe orders using discrete fluorescent lamps with the use of the current proposal a forthcoming communication by the authors in Ref. [25] would be more useful.…”

“…This produces some noise as described in the validation part. The mismatch of modulation of the analysis image and the color adapted LUT is an inherent problem of color adaptation processes [25]. To avoid this, fringe normalization processes can be employed and the fringe maps can be demodulated.…”

“…The nuances of color adaptation and the use of theoretical LUT have been discussed in detail in a forthcoming work by the authors [25]. Nevertheless, the possibility of demodulating higher fringe orders would provide a platform for RGB photoelasticity to be widely used for industrial scenarios, wherein it can be used in reflection coatings to measure strains directly.…”

Cubic polynomial curve-guided method for isochromatic determination in three-fringe photoelasticity

“…Ideally, the same test specimen and lighting conditions are used in both the calibration and the application experiments, but this is not possible in some applications. Color adaptation [6,7] is a simple way of suitably modifying the calibration table. TFP was originally used to estimate total fringe orders up to a value of three, as beyond this point, the colors tend to merge; however, there have been attempts to push this limit [8,9] .…”