refactor: 项目目录结构重组

- 中文目录名改为英文：cDNA图像处理实例→examples，参考资料→references
- web→app（Flask应用标准命名）
- 输出目录平移到 data/output/simple/ 和 data/output/full/
- 输入图像统一到 data/input/
- 构建脚本移到 scripts/
- 源码文件改用 snake_case 命名
- 更新所有文件路径引用和文档

references/matlab/kappa.m

@@ -0,0 +1,28 @@
+function KG = kappa(I)
+% get curvature information of input image
+% input: 2D image I
+% output: curvature matrix KG
+
+% Copyright (c) 2009, 
+% Yue Wu @ ECE Department, Tufts University
+% All Rights Reserved  
+
+I = double(I);
+[m,n] = size(I);
+P = padarray(I,[1,1],1,'pre');
+P = padarray(P,[1,1],1,'post');
+
+% central difference
+fy = P(3:end,2:n+1)-P(1:m,2:n+1);
+fx = P(2:m+1,3:end)-P(2:m+1,1:n);
+fyy = P(3:end,2:n+1)+P(1:m,2:n+1)-2*I;
+fxx = P(2:m+1,3:end)+P(2:m+1,1:n)-2*I;
+fxy = 0.25.*(P(3:end,3:end)-P(1:m,3:end)+P(3:end,1:n)-P(1:m,1:n));
+G = (fx.^2+fy.^2).^(0.5);
+K = (fxx.*fy.^2-2*fxy.*fx.*fy+fyy.*fx.^2)./((fx.^2+fy.^2+eps).^(1.5));
+KG = K.*G;
+KG(1,:) = eps;
+KG(end,:) = eps;
+KG(:,1) = eps;
+KG(:,end) = eps;
+KG = KG./max(max(abs(KG)));