engleski

Custom colour reference target for chronic wound photography

This paper addresses the problem of colour constancy in chronic wound photography. It investigates the possibilities of colour accurate digital imaging of chronic wounds and discussing the practical considerations for using digital images as reliable photo documentation and source for automated wound image analysis. The problem is how to achieve a consistent and accurate colour reproduction of wounds captured under realistic conditions with different digital cameras and various lighting conditions. In order for a wound images to be useful for clinical evaluation, they need to be colour calibrated and independent of camera settings and illumination. This device-independent colour reproduction can be achieved by means of a calibrated colour reference target. For this purpose a custom colour target was developed, used and tested. To evaluate the colour correction in real conditions, the custom target was captured together with the standard Macbeth ColorChecker during a patient examination in three different clinics. Validation of color correction by custom target was carried out by calculating the colour errors and comparing against the standard target. Another validation was performed by analyzing original wound images and images corrected using custom and standard colour reference target using application for wound image analysis and consulting clinician to compare results.

Medical photography; wound photography; wound care; colour tissue classification; custom colour reference target; colour reproduction; digital imaging

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