SAR图像非平稳性对图像模型和滤波降噪方法的影响
用玩具激光笔做泊松亮斑实验
1·Profuse brown necrotic speckling of leaflets usually close to, or just within marginal areas which are initially green but later develop narrow brown scorched rims and then shrivel.
缺钾的苜蓿叶片：大量褐色坏死斑点经常在叶尖边缘附近或叶缘上，最初是绿色但不久就扩展成狭小的褐色烧焦状边缘，直至枯萎。