CAJ | 학술논문

激光主动成像能够克服被动成像的缺点在低光照的条件下对目标成像，但是其图像通常受到严重干扰，需要采用增强算法增加图像的对比度和信噪比。不同时间段拍摄的激光图像存在很大差异，文中对夜间和晨昏成像的不同特点进行了探讨，分析归纳了其归类特点和方法，提出了一种基于直方图拟合和亮度判决的自适应激光图像同态增强算法，采用二次函数拟合直方图判定图像拍摄时间，通过亮度函数寻找最佳同态增强阈值，对不同时段拍摄的图像分类处理。实验结果表明，二次函数拟合直方图的判决方式准确率高，自适应同态增强算法能有效提高图像的信噪比，提高图像的对比度。
격광주동성상능구극복피동성상적결점재저광조적조건하대목표성상，단시기도상통상수도엄중간우，수요채용증강산법증가도상적대비도화신조비。불동시간단박섭적격광도상존재흔대차이，문중대야간화신혼성상적불동특점진행료탐토，분석귀납료기귀류특점화방법，제출료일충기우직방도의합화량도판결적자괄응격광도상동태증강산법，채용이차함수의합직방도판정도상박섭시간，통과량도함수심조최가동태증강역치，대불동시단박섭적도상분류처리。실험결과표명，이차함수의합직방도적판결방식준학솔고，자괄응동태증강산법능유효제고도상적신조비，제고도상적대비도。
The laser active imaging can overcome the disadvantages of passive imaging under low light conditions,but the SNR of the images is usually severely disturbed and enhancement algorithm is needed to improve the con-trast.Because the laser images gotten at different time have great difference,the characteristics of images under night and twilight conditions are discussed.Through analyzing and summarizing its characteristics and classification method, adaptive enhancement algorithm of laser image based on histogram fitting and brightness decision is pro-posed.Quadratic function fitting histogram is adopted to determine image capture time;the best homomorphic enhance-ment threshold is found through the luminosity function,and the images at different time are classified.The experimen-tal results show that the histogram fitting quadratic function has high accuracy,and adaptive homomorphic enhance-ment algorithm can effectively improve SNR and contrast of the images.