摘要
为了分析旋转操作对数字图像颜色数值的影响,选择了3幅各100dpi和50dpi两种分辨率,共6幅彩色图像进行了0.2°、0.5°、1°、2°和4°顺时针加逆时针两个方向的旋转操作,探讨了旋转前后图像的RGB平均差异及CIEL*a*b*平均色差与旋转角度的关系。实验结果表明,颜色数值的变化与旋转角度没有固定的依赖关系,与图像内容及图像分辨率均相关;但CIEL*a*b*平均色差与RGB平均差异表现为线性的正比关系,在相同的图像分辨率下,这一比例关系与图像内容无关,不同图像分辨率下,仅比例关系的常数项稍有变化。
In order to understand the influence of the rotation processing on digital image＇s color data, three different color images, 100 dpi and 50 dpi for each one, totally six images were chosen and rotated clockwise plus anticlockwise for 0.2°, 0, 5°, 1°, 2°ancl 4° respectively. The relationships between the average RGB, CIEL^＊a^＊b^＊ errors of the two compared images and rotation angles were analyzed. The results showed that there were no changeless relations between the color data errors and rotation angles. However, the CIEL^＊a^＊b^＊ color differences were strongly in line with the RGB errors introduced by rotation processing, Beside this, the relationship was independent on image content, only the constant in line relation little changing with the image resolution.
出处
《北京印刷学院学报》
2007年第4期5-7,共3页
Journal of Beijing Institute of Graphic Communication
关键词
数字图像
旋转操作
颜色值差异
色差
digital image
rotation process
color data error
color difference
