# def cal_new_gray(self, y_mat, cdf_obj, cdf_org, org_idx):
# """
# 计算映射后的新灰度级
# """
# new = []
# dis = []
# size = len(cdf_org)
# for i in range(size):
# t = np.abs(cdf_org[i] - cdf_obj)
# index = t.argmin()
# temp = index - i
# new.append(index)
# dis.append(temp)
# new_gray = new
# assert isinstance(y_mat, np.ndarray) # 判断类型
# h, w = y_mat.shape
# new_y = np.zeros_like(y_mat)
# new_gray = np.array(new_gray)
# idx = np.array(org_idx)
# for i in range(h):
# for j in range(w):
# new_y[i, j] = new_gray[int(np.where(idx == y_mat[i, j])[0])]
# return new_y
