[Radiometric calibration of LCTF-based multispectral area CCD camera]

Area of Science:

• Remote Sensing
• Optical Engineering
• Image Processing

Context:

• Multispectral area CCD cameras with liquid crystal tunable filters (LCTF) offer advanced spectral imaging capabilities.
• Existing radiometric calibration methods are insufficient for LCTF-based cameras due to their unique operating principles.
• High precision is critical for remote sensing applications.

Purpose:

• To develop and validate an improved radiometric calibration method for LCTF-based multispectral cameras.
• To address the limitations of current calibration techniques for LCTF and frame transfer CCD systems.
• To enhance the accuracy of radiometric measurements for remote sensing.

Summary:

• An improved radiometric calibration method was developed using integrating spheres and standard detectors.
• The method corrects for frame transfer smear and refines data processing algorithms to calculate absolute calibration coefficients.
• Laboratory calibration coefficients were validated through field experiments, confirming their accuracy.

Impact:

• The improved calibration method ensures the validity of laboratory coefficients for accurate ground radiation inversion.
• Enhanced radiometric calibration resolution and precision extend the application scope of data acquired by LCTF cameras.
• This advancement supports more reliable and effective remote sensing data analysis.