RGB分量线性变换法提取脉动燃烧火焰预混锋面

RGB components linear transformation method for extracting premixed front of pulsating flame

针对脉动燃烧下的甲烷预混火焰,基于图像RGB彩色模型分量线性变换,提出了一种提取火焰预混锋面轮廓线的方法.该方法首先对火焰图像分割区域的RGB分量进行分析,根据三个分量的权重和差异确定特征分量;然后,通过区域选取和计算得到分割区域的特征分量值;最后,对特征分量进行线性变换,增大反差得到新的图像,在此基础上进行迭代、填充等运算,最终实现轮廓线的提取.将该方法运用到不同工况下预混火焰轮廓线的提取中,均能获得理想的效果,并与传统的灰度提取法进行了对比.结果表明,RGB分量线性变换法简单实用、效果更好.

A method for extracting frontal area contour line was proposed for methane premixed flame of pulsating combustion, based on the linear transformation of image RGB components. According to weight and difference of three components of segmentation region, the characteristic components were first determined. Then, through the region selection and computation the value of characteristic components was obtained. Finally, the linear transformation to the characteristic components was carried out to obtain the new image by increasing the contrast; the iteration and packing operations etc. were also further implemented. The method was applied in extracting the contour line of premixed flame under different conditions. The results were compared with the traditional gray-level extraction method, which shows that the RGB components linear transformation method is simple and practical and the effect is much better.