고서화에 찍힌 도장 이미지 추출을 위한 효과적인 촬영 방법

Abstract

This study is a photographic method to effectively extract painting images from old paintings and writings. When stamping on letters among painting images, it is difficult to extract and read due to black letters. This reduces the luminosity and saturation of the red stamping ink on top of the letters, which acts as an obstacle to extraction. To this end, increasing exposure during filming increases the brightness of black letters and allows easy extraction and reading of the brightness and saturation of red stamping ink on top of them. Paintings entered through photographs were processed digitally. We confirmed that switching painting images recorded from RGB mode to Lab mode allows separately adjustment of color chroma and brightness, which is much more effective in extracting paint. Through this, it was possible to find exposure values that are easy to adjust so that the paint on a white background and the letters on the black letters have the same saturation. I think this method will be able to extract and read many old paintings and stamps effectively. It is also thought that it will contribute to confirming the authenticity of the seal in various ancient paintings.