image_encodings.cpp檔案是關于圖像編碼模式的源檔案，其中規定了RGB的圖像以及深度圖的編碼模式
該編碼檔案image_encodings.cpp所依賴的頭檔案圖
指令空間 sensor_msgs::image_encodings 下的函數
int
bitDepth (const std::string &encoding)
bool
hasAlpha (const std::string &encoding)
isBayer (const std::string &encoding)
isColor (const std::string &encoding)
isMono (const std::string &encoding)
numChannels (const std::string &encoding)
const std::string
BGR8 = "bgr8"
MONO16 = "mono16"
MONO8 = "mono8"
TYPE_16SC1 = "16SC1"
TYPE_16UC1 = "16UC1"
TYPE_32FC1 = "32FC1"
TYPE_32SC1 = "32SC1"
TYPE_64FC1 = "64FC1"
TYPE_8SC1 = "8SC1"
TYPE_8UC1 = "8UC1"
最主要的就是編碼的方式的正确即可實作深度圖的顯示
