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import numpy as np
import cv2
import os
from scipy.sparse import csc_matrix
from include.singlephoton import SinglePhotonImaging
# import os
def fcn_PoissonRV(lambda_, ni=None, nj=None):
"""
生成泊松分布随机数矩阵 (向量化实现)
参数:
lambda_ (float/array): 泊松分布参数λ(标量或二维数组)
ni (int): 输出矩阵的行数(当lambda为标量时必填)
nj (int): 输出矩阵的列数(当lambda为标量时必填)
返回:
np.ndarray: 生成的泊松随机数矩阵[ni, nj]
异常:
ValueError: 输入参数不符合要求时抛出
"""
# ========================= 参数验证 =========================
# 情况1:未指定ni/nj时,lambda必须是二维数组
if ni is None and nj is None:
if not isinstance(lambda_, np.ndarray) or lambda_.ndim != 2:
raise ValueError("当未指定ni/nj时,lambda必须是二维数组!")
ni, nj = lambda_.shape
# 情况2:指定了ni/nj
elif ni is not None and nj is not None:
# 如果lambda是标量,扩展为指定大小的矩阵
if np.isscalar(lambda_):
lambda_ = np.full((ni, nj), lambda_)
# 如果lambda是数组,验证形状是否匹配
elif isinstance(lambda_, np.ndarray) and lambda_.shape != (ni, nj):
raise ValueError(f"lambda形状{lambda_.shape}与({ni},{nj})不匹配!")
# 情况3:参数不完整
else:
raise ValueError("必须同时指定ni和nj,或都不指定!")
# ========================= 初始化 =========================
ks1 = np.zeros((ni, nj), dtype=int) # 结果矩阵
ks2 = np.ones((ni, nj), dtype=int) # 比较矩阵
produ = np.ones((ni, nj)) # 乘积累加器
# ========================= 主循环 =========================
while np.any(ks1 != ks2):
# 更新乘积(向量化操作)
produ *= np.random.rand(ni, nj)
# 保存当前状态
ks2 = ks1.copy()
# 找出需要增加计数的位置(向量化掩码操作)
mask = produ >= np.exp(-lambda_)
ks1[mask] += 1
return ks1
def tof2spad(tof, binnum):
h, w = tof.shape
# 将 data_processed 重塑为列向量
tof = tof.T
data = tof.reshape(h * w)
# 创建一个大小为 h * w 行,10000 列的零矩阵
spad = np.zeros((h * w, int(binnum)), dtype=float)
# 遍历 data
for i in range(h * w):
d = data[i]
for j in range(len(d)):
if int(d[j] - 1) < binnum:
spad[i, int(d[j] - 1)] += 1
spad = csc_matrix(spad)
return spad
def generate_simdata(
Z_true,
Alpha_true,
SBR=0.2,
meanSigDetect=2,
save_path=None,
zMax=15,
binDuration=8e-12,
):
"""
生成单光子数据集仿真数据(Python版本)
参数:
Z_true (array): 深度真值
Alpha_true (array): 反射率真值
SBR (float): 信号背景比 (默认0.2)
meanSigDetect (int): 每像素平均信号光子数 (推荐值2/3/4)
save_path (str): 数据保存路径 (.mat文件)
返回:
tuple: (tBinMax, binDuration, sigDetect, totDetect)
tBinMax (int): 最大时间bin数
binDuration (float): 单个时间bin持续时间 (秒)
sigDetect (np.ndarray): 信号光子
totDetect (np.ndarray): 检测事件对象数组 [H,W] (每个元素包含时间bin序列)
"""
# 第一阶段: 物理参数配置
# 场景参数
# zMax = 15.0 # 最大探测距离(米)
# binDuration = 8e-12 # 单个时间bin持续时间(秒)
pulseRMS = 270 / 8 # 脉冲RMS宽度(时间bin数)
# 计算衍生参数
ttd = 3e8 * binDuration / 2 # 时间到距离转换因子 (米/bin)
tBinMax = int(round(zMax / ttd)) # 最大时间bin数
pulseSTD = pulseRMS / 2 # 高斯脉冲标准差
# print("tBinMax:",tBinMax)
# 第二阶段: 信号光子生成
# 计算时间维度真实值
T_true = np.floor(Z_true / ttd).astype(int)
# 计算总帧数
numFrames = int(meanSigDetect * 500)
# 标准化反射率参数
Lr, Lc = Alpha_true.shape
Alpha_true = meanSigDetect * Alpha_true / np.mean(Alpha_true) / numFrames
# 生成信号光子数(泊松分布)
numSigDetect = fcn_PoissonRV(numFrames * Alpha_true)
actual_mean = np.mean(numSigDetect)
sigDetect = np.empty((Lr, Lc), dtype=object)
sampMean = np.zeros((Lr, Lc))
# 遍历每个像素生成时间分布
for i in range(Lr):
for j in range(Lc):
mu = T_true[i, j]
n = numSigDetect[i, j]
# 生成高斯分布时间偏移
tempVect = np.round(mu + pulseSTD * np.random.randn(n)).astype(int)
sampMean[i, j] = np.mean(tempVect) if n > 0 else 0
sigDetect[i, j] = tempVect
# 第三阶段: 背景噪声生成
# 计算背景光子率
bgndRate = actual_mean / numFrames / SBR
# 生成背景光子数
numBgndDetect = fcn_PoissonRV(numFrames * bgndRate, Lr, Lc)
bgndDetect = np.empty((Lr, Lc), dtype=object)
# 生成均匀分布时间
for i in range(Lr):
for j in range(Lc):
n = numBgndDetect[i, j]
bgndDetect[i, j] = np.random.randint(0, tBinMax, n)
# 第四阶段: 数据合并与后处理
totDetect = np.empty((Lr, Lc), dtype=object)
for i in range(Lr):
for j in range(Lc):
combined = np.concatenate((sigDetect[i, j], bgndDetect[i, j]))
combined = np.sort(combined)
combined = combined[combined > 0] # 移除非法时间bin
totDetect[i, j] = combined
spad = tof2spad(totDetect, tBinMax)
sigDetect = tof2spad(sigDetect, tBinMax)
return tBinMax, sigDetect, spad
# 补充泊松生成函数(原型实现)
def fcn_PoissonRV(lamda, *shape):
if not shape:
return np.random.poisson(lamda)
else:
return np.random.poisson(lamda, shape)
import cv2
import numpy as np
import os
from scipy.io import savemat
from pathlib import Path
def generate_sim_imageNet(
depth_path, rgb_path, SBR=0.2, meanSigDetect=4, save_path=None
):
"""
生成cityscapes数据集仿真数据(Python版本)
参数:
depth_path (str): 深度图文件路径 (npz)
rgb_path (str): RGB图像文件路径
SBR (float): 信号背景比 (默认0.2)
meanSigDetect (int): 每像素平均信号光子数 (推荐值2/3/4)
save_path (str): 数据保存路径 (.npz文件)
返回:
tuple: (Z_true, totDetect, tBinMax, binDuration)
Z_true (np.ndarray): 真实深度图矩阵 [H,W] (单位:米)
totDetect (np.ndarray): 检测事件对象数组 [H,W] (每个元素包含时间bin序列)
tBinMax (int): 最大时间bin数
binDuration (float): 单个时间bin持续时间 (秒)
PS:
由于使用DepthAnything数据生成的深度图,是三通道的,所以在处理前需要先将其转换为单通道的
为了保证数据兼容性,所以统一提取第一个通道作为深度数据
"""
# 第一阶段: 基础数据加载与参数初始化
# 读取深度图并转换为米单位
# 读取深度图的最大深度
# binDuration = 4e-10
# zMax = 15
# binDuration = zMax/1.5e11
# 读取深度数据
Z_true = np.load(depth_path, allow_pickle=True).astype(np.float64)
if Z_true.ndim == 3:
Z_true = Z_true[:, :, 0]
# 1. 避免除零和过小值
threshold = 1e-10
Z_affine_safe = np.clip(Z_true, threshold, None)
# 2. 取倒数得到缩放深度
Z_scaled = 1 / Z_affine_safe
max_value = np.max(Z_scaled)
min_value = np.min(Z_scaled)
# # 3. 截断离群值(可选)
# lower, upper = np.percentile(Z_scaled, [1, 99])
# Z_clipped = np.clip(Z_scaled, lower, upper)
# 4. 归一化到[0,1]
Z_normalized = (Z_scaled - min_value) / (max_value - min_value)
# 5. 反转方向:近处亮,远处暗
Z_depth = (1 - Z_normalized)*max_value
# zMax = np.max(Z_true)
zMax = int(np.max(Z_true)*1.5)
binDuration = zMax / 2e11
# 验证时间箱数量
ttd = 3e8 * binDuration / 2 # 时间到距离转换因子 (米/bin)
tBinMax = int(round(zMax / ttd)) # 最大时间bin数
print(f"tBinMax: {tBinMax}")
# 计算深度范围 (必须在缩放前获取原始深度最大值)
# zMax = int(np.max(Z_true) + 1)
# zMax = 15
# binDuration = 10e-11
# 计算目标尺寸(保持长宽比)
target_size = 64
height, width = Z_true.shape
scale = target_size / min(height, width)
new_width = int(width * scale)
new_height = int(height * scale)
# 缩放深度图(使用INTER_AREA保持精度)
Z_true = cv2.resize(
Z_true,
(new_width, new_height),
interpolation=cv2.INTER_AREA
)
# 读取并处理RGB图像
rgb_img = cv2.imread(rgb_path)
Alpha_true = cv2.cvtColor(rgb_img, cv2.COLOR_BGR2GRAY).astype(np.float64)
# 以相同比例缩放灰度图
Alpha_true = cv2.resize(
Alpha_true,
(new_width, new_height),
interpolation=cv2.INTER_AREA
)
# # 输出最终尺寸信息
# print(f"深度图最终尺寸: {Z_true.shape}")
# print(f"反射率图最终尺寸: {Alpha_true.shape}")
# # 动态计算zMax(忽略深度为0的无效点)
# valid_depths = Z_true[Z_true > 0] # 筛选有效深度点(>0)
# if valid_depths.size > 0:
# zMax = np.max(valid_depths) * 2 # 取最大值并增加10%余量
# else:
# zMax = 15 # 默认值(无有效点时使用)
tBinMax, sigDetect, spad = generate_simdata(
Z_true, Alpha_true, SBR, meanSigDetect, save_path, zMax, binDuration
)
lr, lc = Z_true.shape
sp = SinglePhotonImaging(lr, lc, binDuration)
depth = sp.ssp(spad)
if save_path:
# 创建保存目录(如果不存在)
os.makedirs(os.path.dirname(save_path), exist_ok=True)
dic_data = {}
dic_data["depth_ssp"] = depth
dic_data["Z_true"] = Z_true
dic_data["tBinMax"] = tBinMax
dic_data["binDuration"] = binDuration
dic_data["spad_data"] = spad.data
dic_data["spad_indices"] = spad.indices
dic_data["spad_indptr"] = spad.indptr
dic_data["spad_shape"] = spad.shape
dic_data["sigDetect_data"] = sigDetect
# scipy.io.savemat(save_path, dic_data)
np.savez_compressed(save_path, **dic_data)