基于亮度自适应调整的低对比度红外图像增强算法

为了克服传统红外图像增强算法中目标对比度差,无法有效识别感兴趣区域目标的缺点,提出一种基于亮度自适应调整的图像增强算法。该算法从人眼视觉感知特性出发,兼顾图像全局亮度自适应调整与局部特征增强,之后对整幅图像归一化处理,使图像整体对比度增强的同时纹理细节更加清晰。实验结果表明:直方图增强后的图像对比度提高,但是纹理细节不清晰;由Retinex算法增强的图像可以看到纹理细节,提出的基于亮度自适应调整增强算法处理后的图像不但纹理细节清晰,而且与Retinex增强图像相比图像对比度明显提高,视觉效果好。

A Low Contrast Infrared Image Enhancement Algorithm Based on Luminance Adaptive Adjustment

An adaptive enhancement algorithm for low contrast infrared image is proposed in this paper, to deal with the problem that conventional infrared image enhancement algorithm is not able to effective identify the interesting region. This algorithm begin with the human visual perception characteristics, take account of the global adaptive image enhancement and local feature boost, Lastly, we normalize the global luminance adjustment image and the local brightness adjustment image, to ensure the distinctness of texture detail in image enhancement. Experiments results show that: the contrast ratio of the picture is boosted after handled by histogram equalization algorithm, but the detail of the picture is not clear, the detail of the picture can be distinguished after handled by the Retinex algorithm. The image after deal with by self-adaptive enhancement algorithm proposed in this paper becomes clear in details, and the image contrast is markedly improved in comparison with Retinex algorithm.