系列文章目录

第一章 国惠光电相机SDK调用——python实现

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前言

国惠相机SDK采用c语言开发，以动态库（IRSDK.dll和IRSDK.lib）形式发布，在利用相机SDK进行二次开发时，请先详细了解SDK相关功能。本文主要引入python对国惠相机SDK的调用，实现用python对相机的二次开发应用。本例程内容使用python3.9版本，在window10 64位机上编译实现。

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一、必备python知识

进行相关开发之前建议熟悉ctypes模块，推荐阅读

https://www.cnblogs.com/night-ride-depart/p/4907613.html

https://blog.csdn.net/lingyu_me/article/details/106837084

二、相机SDK调用实现

1. 创建设备信息结构体（照搬SDK，api.h中的DeviceInformation结构体）

class DeviceInformation(ctypes.Structure):_fields_ = [("name", ctypes.c_char*16),  # 定义一维数组("transport", ctypes.c_char*16),("url", ctypes.c_char * 32),("address", ctypes.c_char * 16),("interfaceName", ctypes.c_char * 16),("serial_num", ctypes.c_char * 16),("pid", ctypes.c_int),("width", ctypes.c_short),("height", ctypes.c_short)]

2.导入python模块

import ctypes 
from ctypes import * 
import numpy as np
import cv2

3.引入相机SDK

fileName = "../BinX64/IRSDK.dll" # 此处根据dll实际所在位置设置路径 
GHOPTO_SDK = ctypes.WinDLL(fileName)

4.查找连接设备

m_deviceCount = c_int(0)#枚举查找设备
GHOPTO_SDK.IR_EnumerateDevices.argtypes = [c_void_p, c_void_p, c_int]  
GHOPTO_SDK.IR_EnumerateDevices.restype = c_int 
GHOPTO_SDK.IR_EnumerateDevices(None, byref(m_deviceCount), 0x00000020) 
#USB设备0x00000020   #千兆网口设备0x00000008#获取设备信息打开设备
m_deviceList = DeviceInformation()
GHOPTO_SDK.IR_EnumerateDevices(pointer(m_deviceList), byref(m_deviceCount), 0x01000000)m_DeviceHandle = None #设备号
GHOPTO_SDK.IR_OpenDevice.argtypes = [c_void_p, c_char_p]  
GHOPTO_SDK.IR_OpenDevice.restype = c_void_p  
m_DeviceHandle = GHOPTO_SDK.IR_OpenDevice(None, m_deviceList.url)#获取相机幅面大小
iWidth = c_int(0)
iHeight = c_int(0)
GHOPTO_SDK.IR_GetDigitArrayPara.argtypes = [c_void_p, c_void_p, c_void_p]  
GHOPTO_SDK.IR_GetDigitArrayPara(m_DeviceHandle, byref(iWidth), byref(iHeight))

5.获取图像数据

GHOPTO_SDK.IR_GetNewArray.argtypes = [c_void_p, ]
GHOPTO_SDK.IR_GetNewArray(m_DeviceHandle) #每次获取新图像都需调用一次该函数len = iWidth.value * iHeight.value
pRawShortData = (c_int16 * len)(*[0])
cast(pRawShortData, POINTER(c_int16))
pBmpData = (c_uint8 * len)(*[0])
cast(pBmpData, POINTER(c_int8))#获取14位原始数据，按两字节存放
GHOPTO_SDK.IR_GetDigitArray.argtypes = [c_void_p, POINTER(c_int16)]  
GHOPTO_SDK.IR_GetDigitArray(m_DeviceHandle, pRawShortData) #原始数据转8位数据，方便显示           
GHOPTO_SDK.IR_DigitArrayToBmp.argtypes = [c_void_p, POINTER(c_int16), POINTER(c_uint8), c_int, c_void_p] 
GHOPTO_SDK.IR_DigitArrayToBmp(m_DeviceHandle, pRawShortData, pBmpData, 0, None)

6.采用cv2模块显示

#一维数据转二维矩阵
np_image = np.array(pBmpData).reshape(iHeight.value, iWidth.value)
np_image = np.flipud(np_image) #对数据进行上下反转，实现正常图像数据#调用cv2显示
cv2.imshow('Camera Video', np_image)
key=cv2.waitKey(50) #50ms刷新一次

 7.相机参数控制（以快门校正为例，展示IR_SendSeriaPortCmd函数的应用）

cmd = c_uint8*16
SHUTTER = cmd(0xFF, 0xFF, 0xAA, 0xFF, 0x00, 0x09, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00)
for i in range(3, len(SHUTTER) - 1):SHUTTER[15] = SHUTTER[15] ^ SHUTTER[i]GHOPTO_SDK.IR_SendSeriaPortCmd.argtypes = [c_void_p, c_void_p, c_int]
GHOPTO_SDK.IR_SendSeriaPortCmd.restype = c_bool
GHOPTO_SDK.IR_SendSeriaPortCmd(m_DeviceHandle, byref(SHUTTER), len(SHUTTER))

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总结

 以上主要实现相机的连接和实现视频显示，关于SDK的其他功能和应用，暂时未实现，待续。谢谢！