基于BP神经网络的复杂彩色图像文本定位*

针对复杂彩色图像中文本的特征,提出了基于小波变换和BP神经网络甄别文本区域的算法.该算法首先利用文本块的边缘特征遴选出备选图像块,而后采用小波变换提取备选图像块的纹理特征,把这些纹理特征参量连同图像块的颜色特征和笔画特征参量输入训练好的BP神经网络,判断备选图像块是否包含文本.该方法运算简单,定位时间短.采用专用的文本定位比赛用图进行实验的结果表明,定位准确率可达到92％,召回率为87.4%.

Text Location in Complex Color Images Based on BP Neural Network

According to the features of text information in complex color images,a method which is used to discriminate the text region on the basis of wavelet transform and BP neural network is proposed. The wavelet transform is adopted to extract the texture feature parameters of candidate image blocks,which is obtained by the judgment of the edge feature. Then these parameters are taken as input for the BP neural network which has been well trained,together with the parameters of the color feature and the stroke feature,to judge whether some texts are in the candidate image blocks or not. Compared with the others,the method mentioned above is simpler in operation and shorter in time of location. The experimental results indicate that,as for the images which are provided by the text location competition,locating accuracy can come to 92％,meanwhile,the recall ratio can reach up to 87.4%.