Here is a list of all documented variables with links to the class documentation for each member:

b : robot_control::ball_chaser::RgbThreshold
g : robot_control::ball_chaser::RgbThreshold
height : robot_control::ball_chaser::ImageDimensions
m_callCount : ProcessImageTest
m_client : DriveBotTest, ProcessImageTest
m_dims : FindBallRegionTest
m_executor : DriveBotTest, ProcessImageTest
m_lastRequest : ProcessImageTest
m_pub : ProcessImageTest
m_pubNode : ProcessImageTest
m_requester : DriveBotTest
m_server : DriveBotTest
m_service : ProcessImageTest
m_stubNode : ProcessImageTest
m_threshold : FindBallRegionTest
r : robot_control::ball_chaser::RgbThreshold
step : robot_control::ball_chaser::ImageDimensions
width : robot_control::ball_chaser::ImageDimensions