一个生成验证码的测试程序，给验证码叠加了正弦波，使字形扭曲，难以机器识别，但人眼容易识别。-a validation code generation test procedure for the verification code superimposed on the sine wave, the characters twisted, difficult to identify machines, But the human eye easily identifiable.

用JAVA人眼图形-eyes with Java graphics