Blind Crosstalk Correction for Color Fringe Projection Profilometry Combining the Sine and Cosine Phase-Shifting Patterns

Abstract

Color crosstalk is challenging for color fringe projection profilometry, which will cause color imbalance and phase-shift deviation, thus resulting in phase error. To address this challenge, this paper presents a blind crosstalk correction method for color phase-shifting fringe projection profilometry without crosstalk calibration. Three channels of the color fringe are firstly normalized to resolve color imbalance. The phase error induced by phase-shift deviation between three channels doubles the frequency of the color fringe. Therefore, the original cosine color fringe is shifted by quarter period to generate another sine color fringe to compensate the periodic phase error. Both simulations and experiments were carried out, and their results confirmed the effectiveness and accuracy of the proposed method.

Surface structured light sensor with simultaneous color mapping

“…Although the 3-CCD camera has separate photoreceptors for red, green, and blue illuminations, different wavelengths of light respond on trichromatic channels, resulting in interference from other channels [20]. In the field of color-coding pattern reconstruction, crosstalk correction of pixels is necessary [21]. Caspi et al [22] used a 3-CCD camera color response model to build a relationship between the camera and the projector to obtain the color coupling coefficient matrix, which improved the accuracy of RGB images.…”