用计算机模拟四步相移的数字全息图，并取得他的包裹相位-Computer simulation of the four-step phase shifting digital hologram, and made him the wrapped phase

四步相移法程序和最小二乘法相位解包裹程序，已经验证，此方法比较不错。-Four-step phase shift method and the method of least squares program phase unwrapping process has been verified that this method is relatively good.