Camera attitude detection device and work region line display device

Abstract

There is provided a monitoring camera () at a tip of a boom, a monitor () configured to display a captured image of a hook suspended from the tip of the boom, an attitude angle calculation device () configured to calculate, based on hook image position information on a screen displayed on the monitor () and hook position information in a real space, an attitude angle of the camera, and the attitude angle calculation device () includes a hook position calculation unit () configured to calculate a hook position on the screen actually displayed on the monitor (), a shift amount calculation unit () configured to calculate the distance between the hook position calculated by the hook position calculation unit () and a reference hook position of the hook on the screen displayed on the monitor () when it is assumed that the camera faces directly downward, and a camera inclination angle calculation unit () configured to calculate an inclination angle of the monitoring camera () based on the difference and a distance in a height direction from an optical axis center position of the monitoring camera () to the hook.