The Experts below are selected from a list of 279 Experts worldwide ranked by ideXlab platform

David P. Towers - One of the best experts on this subject based on the ideXlab platform.

  • compensating lateral Chromatic Aberration of a colour fringe projection system for shape metrology
    Optics and Lasers in Engineering, 2010
    Co-Authors: Zonghua Zhang, Catherine E. Towers, David P. Towers
    Abstract:

    In this paper we demonstrate a technique to compensate for lateral Chromatic Aberration between the red, green and blue channels of a colour fringe projection system. For measurement of colourful artefacts it is important to be able to combine data from the different colour channels to accurately quantify the artefact's form, with colour capture also providing colour texture information that can be mapped onto the form data. However, the use of conventional refractive lenses in the projection and imaging systems introduce dispersion and hence lateral Chromatic Aberration that modifies the measured phase differently in each of the colour channels. A linear compensation model is proposed using phase maps from the different colour channels to enable the magnitude of lateral Chromatic Aberration to be calibrated. The required performance of the technique is established via simulations and the use of the technique over a typical depth of field has been confirmed experimentally. Results from a white reference plane, a telephone and a colourful painting show that the proposed method compensates lateral Chromatic Aberration from the captured shape data. The probability of calculating the correct fringe order by unwrapping the phase between the different colour channels is typically 99.9%.

  • Compensating lateral Chromatic Aberration of a colour fringe projection system for shape metrology
    Optics and Lasers in Engineering, 2010
    Co-Authors: Z H Zhang, Catherine E. Towers, David P. Towers
    Abstract:

    In this paper we demonstrate a technique to compensate for lateral Chromatic Aberration between the red, green and blue channels of a colour fringe projection system. For measurement of colourful artefacts it is important to be able to combine data from the different colour channels to accurately quantify the artefact's form, with colour capture also providing colour texture information that can be mapped onto the form data. However, the use of conventional refractive lenses in the projection and imaging systems introduce dispersion and hence lateral Chromatic Aberration that modifies the measured phase differently in each of the colour channels. A linear compensation model is proposed using phase maps from the different colour channels to enable the magnitude of lateral Chromatic Aberration to be calibrated. The required performance of the technique is established via simulations and the use of the technique over a typical depth of field has been confirmed experimentally. Results from a white reference plane, a telephone and a colourful painting show that the proposed method compensates lateral Chromatic Aberration from the captured shape data. The probability of calculating the correct fringe order by unwrapping the phase between the different colour channels is typically 99.9%. © 2009 Elsevier Ltd. All rights reserved.

Zonghua Zhang - One of the best experts on this subject based on the ideXlab platform.

  • compensating lateral Chromatic Aberration of a colour fringe projection system for shape metrology
    Optics and Lasers in Engineering, 2010
    Co-Authors: Zonghua Zhang, Catherine E. Towers, David P. Towers
    Abstract:

    In this paper we demonstrate a technique to compensate for lateral Chromatic Aberration between the red, green and blue channels of a colour fringe projection system. For measurement of colourful artefacts it is important to be able to combine data from the different colour channels to accurately quantify the artefact's form, with colour capture also providing colour texture information that can be mapped onto the form data. However, the use of conventional refractive lenses in the projection and imaging systems introduce dispersion and hence lateral Chromatic Aberration that modifies the measured phase differently in each of the colour channels. A linear compensation model is proposed using phase maps from the different colour channels to enable the magnitude of lateral Chromatic Aberration to be calibrated. The required performance of the technique is established via simulations and the use of the technique over a typical depth of field has been confirmed experimentally. Results from a white reference plane, a telephone and a colourful painting show that the proposed method compensates lateral Chromatic Aberration from the captured shape data. The probability of calculating the correct fringe order by unwrapping the phase between the different colour channels is typically 99.9%.

Catherine E. Towers - One of the best experts on this subject based on the ideXlab platform.

  • compensating lateral Chromatic Aberration of a colour fringe projection system for shape metrology
    Optics and Lasers in Engineering, 2010
    Co-Authors: Zonghua Zhang, Catherine E. Towers, David P. Towers
    Abstract:

    In this paper we demonstrate a technique to compensate for lateral Chromatic Aberration between the red, green and blue channels of a colour fringe projection system. For measurement of colourful artefacts it is important to be able to combine data from the different colour channels to accurately quantify the artefact's form, with colour capture also providing colour texture information that can be mapped onto the form data. However, the use of conventional refractive lenses in the projection and imaging systems introduce dispersion and hence lateral Chromatic Aberration that modifies the measured phase differently in each of the colour channels. A linear compensation model is proposed using phase maps from the different colour channels to enable the magnitude of lateral Chromatic Aberration to be calibrated. The required performance of the technique is established via simulations and the use of the technique over a typical depth of field has been confirmed experimentally. Results from a white reference plane, a telephone and a colourful painting show that the proposed method compensates lateral Chromatic Aberration from the captured shape data. The probability of calculating the correct fringe order by unwrapping the phase between the different colour channels is typically 99.9%.

  • Compensating lateral Chromatic Aberration of a colour fringe projection system for shape metrology
    Optics and Lasers in Engineering, 2010
    Co-Authors: Z H Zhang, Catherine E. Towers, David P. Towers
    Abstract:

    In this paper we demonstrate a technique to compensate for lateral Chromatic Aberration between the red, green and blue channels of a colour fringe projection system. For measurement of colourful artefacts it is important to be able to combine data from the different colour channels to accurately quantify the artefact's form, with colour capture also providing colour texture information that can be mapped onto the form data. However, the use of conventional refractive lenses in the projection and imaging systems introduce dispersion and hence lateral Chromatic Aberration that modifies the measured phase differently in each of the colour channels. A linear compensation model is proposed using phase maps from the different colour channels to enable the magnitude of lateral Chromatic Aberration to be calibrated. The required performance of the technique is established via simulations and the use of the technique over a typical depth of field has been confirmed experimentally. Results from a white reference plane, a telephone and a colourful painting show that the proposed method compensates lateral Chromatic Aberration from the captured shape data. The probability of calculating the correct fringe order by unwrapping the phase between the different colour channels is typically 99.9%. © 2009 Elsevier Ltd. All rights reserved.

Z H Zhang - One of the best experts on this subject based on the ideXlab platform.

  • Compensating lateral Chromatic Aberration of a colour fringe projection system for shape metrology
    Optics and Lasers in Engineering, 2010
    Co-Authors: Z H Zhang, Catherine E. Towers, David P. Towers
    Abstract:

    In this paper we demonstrate a technique to compensate for lateral Chromatic Aberration between the red, green and blue channels of a colour fringe projection system. For measurement of colourful artefacts it is important to be able to combine data from the different colour channels to accurately quantify the artefact's form, with colour capture also providing colour texture information that can be mapped onto the form data. However, the use of conventional refractive lenses in the projection and imaging systems introduce dispersion and hence lateral Chromatic Aberration that modifies the measured phase differently in each of the colour channels. A linear compensation model is proposed using phase maps from the different colour channels to enable the magnitude of lateral Chromatic Aberration to be calibrated. The required performance of the technique is established via simulations and the use of the technique over a typical depth of field has been confirmed experimentally. Results from a white reference plane, a telephone and a colourful painting show that the proposed method compensates lateral Chromatic Aberration from the captured shape data. The probability of calculating the correct fringe order by unwrapping the phase between the different colour channels is typically 99.9%. © 2009 Elsevier Ltd. All rights reserved.

Woojin Song - One of the best experts on this subject based on the ideXlab platform.

  • removing Chromatic Aberration by digital image processing
    Optical Engineering, 2010
    Co-Authors: Soonwook Chung, Woojin Song
    Abstract:

    Chromatic Aberration is a form of Aberration in color optical devices that produces undesirable color fringes along borders within images. It is becoming a more critical problem these days as digital cameras are getting smaller, while the number of picture elements is increasing. We propose a novel method for detecting and eliminating Chromatic Aberration using image processing. We first analyze the color behavior on edges that do not show Chromatic Aberration and propose a range limitation for color difference signals. When pixels violate the preceding condition, they can be considered as color fringes caused by Chromatic Aberration. Corrected pixel values are generated to eliminate the Chromatic Aberrations. The proposed algorithm corrects both lateral and longitudinal Aberration in an image, and experimental results are provided to demonstrate its efficacy.

  • Removing Chromatic Aberration by digital image processing
    Optical Engineering, 2010
    Co-Authors: Soonwook Chung, Woojin Song
    Abstract:

    Abstract. Chromatic Aberration is a form of Aberration in color opticaldevices that produces undesirable color fringes along borders within im-ages. It is becoming a more critical problem these days as digital cam-eras are getting smaller, while the number of picture elements is increas-ing. We propose a novel method for detecting and eliminating ChromaticAberration using image processing. We first analyze the color behavioron edges that do not show Chromatic Aberration and propose a rangelimitation for color difference signals. When pixels violate the precedingcondition, they can be considered as color fringes caused by ChromaticAberration. Corrected pixel values are generated to eliminate the chro-matic Aberrations. The proposed algorithm corrects both lateral and lon-gitudinal Aberration in an image, and experimental results are providedto demonstrate its efficacy. © 2010 Society of Photo-Optical InstrumentationEngineers. DOI: 10.1117/1.3455506 Subject terms: Chromatic Aberration; color fringe; digital camera; imageenhancement

  • ICIP - Detecting and eliminating Chromatic Aberration in digital images
    2009 16th IEEE International Conference on Image Processing (ICIP), 2009
    Co-Authors: Soonwook Chung, Woojin Song
    Abstract:

    Chromatic Aberration is a form of distortion in color optical devices that produces undesirable color fringes along borders within images. In this paper, we propose a novel method for detecting and eliminating Chromatic Aberration using image processing. We first analyze the color difference behavior around edges that do not show Chromatic Aberration and propose a range limitation property for edges. After searching for the pixels that violate the above property, the corrected pixel values are generated to eliminate the color fringes. The proposed algorithm corrects both lateral and longitudinal Aberration on a single distorted image, and experimental results demonstrate the performance of the proposed method is effective.

  • Detecting and eliminating Chromatic Aberration in digital images
    2009 16th IEEE International Conference on Image Processing (ICIP), 2009
    Co-Authors: Soonwook Chung, Woojin Song
    Abstract:

    Chromatic Aberration is a form of distortion in color optical devices that produces undesirable color fringes along borders within images. In this paper, we propose a novel method for detecting and eliminating Chromatic Aberration using image processing. We first analyze the color difference behavior around edges that do not show Chromatic Aberration and propose a range limitation property for edges. After searching for the pixels that violate the above property, the corrected pixel values are generated to eliminate the color fringes. The proposed algorithm corrects both lateral and longitudinal Aberration on a single distorted image, and experimental results demonstrate the performance of the proposed method is effective.