Colorimetric Calibration of a Digital Camera
This work addresses colorimetric calibration for digital cameras, which is an incremental improvement in image processing for applications requiring precise color accuracy.
The paper tackles the problem of calibrating digital camera chips by introducing a physico-chemical approach that uses calibration films to construct per-pixel calibration curves, resulting in corrected raw image files with demonstrated suitability for further processing and analysis.
In this paper, we introduce a novel - physico-chemical - approach for calibration of a digital camera chip. This approach utilizes results of measurement of incident light spectra of calibration films of different levels of gray for construction of calibration curve (number of incident photons vs. image pixel intensity) for each camera pixel. We show spectral characteristics of such corrected digital raw image files (a primary camera signal) and demonstrate their suitability for next image processing and analysis.