分层自适应的炉内火焰图像显著点提取方法

针对锅炉和工业生产中产生的大量炉内火焰图像的特征提取问题,提出一种分层自适应显著点提取方法。首先利用块逆概率差模型将原图像转换为块逆概率差(BDIP)图像。在此基础上,将得到的BDIP图像进行Haar小波变换,利用改进的加权方法计算出二维图像的显著值,然后通过提出的自适应的方法构建一棵非平衡四叉树,树的根节点代表整幅图像的显著值,根据每棵子树的显著值占父节点显著值的比例确定子树的显著点数目。该算法与基于BDIP的和基于Haar小波变换的显著点提取算法对比,实验结果表明,边缘准确率和综合特征检索精度都至少提高了10%和3.5%。结果说明,该算法不仅克服了传统显著点提取时数目过多以及提取点不显著的缺点,同时还避免了显著点的局部聚集。

Salient points extraction method of furnace flame image based on hierarchical adaptive algorithm

Given the feature extraction of the furnace flame image produced in boilers and industrial production, a hierarchical adaptive method to extract salient points was proposed. First the Block Difference of Inverse Probabilities (BDIP) model was used to change the original image into BDIP image. On the basis of this, the BDIP image was made into Haar wavelet transform, the salient value of two-dimensional image was calculated by the improved weighted method, and then a non-equilibrium quadtree was built through the proposed adaptive method. The root of quadtree represented the salient value of the image, and the salient points number of subtree was determined according to the ratio of the salient value of every subtree to the salient value of parent node. The proposed extracting algorithm was salient points compared with the extracting algorithms based on BDIP and based on Haar wavelet transform. The experimental results show that edge accuracy and comprehensive feature retrieval accuracy at least increase by 10% and 3.5% respectively. The proposed method overcomes the shortcoming of traditional way that it extracts too many salient points and some extracted points are not salient, at the same time the method avoids local gather of salient points.