Abstract
Visual images are one of the most important means of determining whether food has been cooked to perfection, especially while baking, which is a popular cooking method. In this study, equipment for recording the images of the food surface and image editing software were developed in order to record color images having generality and to evaluate the color change due to baking. A spherical dome with a diameter of 500 mm, whose inner surface was painted white, was used as the integrating sphere. The subject (food) was placed in the middle of the dome. Two D65 fluorescent lamps powered by a high-frequency inverter power supply were placed below the subject as the light source. Thus, the subject could be illuminated only by indirect light. The X-Rite White Balance Card and X-Rite ColorChecker were used for color correction. The colors with Munsell chroma, C, less than 5 were in a good agreement with the standard value obtained from the color chart after color correction. The color change of breadcrumbs during re-baking under 200℃ airflow is evaluated from a histogram of L* values versus the number of pixels of the corrected image as a test case.
