基于FPGA的红外序列图像动态压缩显示

Infrared Sequence Image Dynamic Compression Display Based on FPGA

高位宽红外相机数字视频信号在向8位宽模拟信号线性压缩显示转换时存在细节丢失的现象。针对这一问题,提出了一种新算法,即先利用高斯滤波器对红外数字图像进行低通滤波,然后将低频图像进行线性压缩后再进行直方图均衡运算,之后与滤波产生的高频细节信号进行叠加后送到D/A芯片进行模拟显示。详细讨论了该算法在FPGA嵌入式系统上的具体硬件结构和实现方法,并对12位相机采集的图像进行了实时压缩显示实验。最终实验结果证明,该系统在进行压缩显示时可以很好地显示传统压缩算法无法显示的细节信息,并有效抑制了图像的高频噪声。

When compressing image of high bit-wide infrared cameras to 8-bit analog image to display, it exists that image lost the most details, this paper put forward a new algorithm that use the Gauss filter to make the image still to keep the infrared image detail information after compression. The paper introduced the method how to make algorithm to be realized on FPGA hardware,and make an experiment that 12 bit camera image is compressed to 8 bit analog display on real-time. The experimental results show that the system can keep the de tail information perfectly under the condition of restrain noise, and can change 12 bit-wide 320X 240 surface array of infrared cameras into analog video under preserving details.