Semiconductor device and message image signal output method

A semiconductor device outputting a message image signal being a signal of a message image to be projected onto a projection area located at a predetermined distance from a mobile, the semiconductor device comprising:

• a position estimation circuit which calculates an estimation position of the mobile at a scheduled time to project the message image based on movement information of the mobile;
• a reference image signal output circuit which decides a reference area being an area to project a reference image based on a relative positional relation between the mobile at the estimation position and the projection area, and outputs a reference image signal being a signal of the reference image to be projected onto the reference area;
• a test image signal acquisition circuit which acquires a test image signal being a signal of a test image obtained by imaging the reference area onto which the reference image is projected;
• a comparison circuit which compares the reference image signal with the test image signal;
• an image adjustment circuit which adjusts the message image signal based on comparing the reference image signal with the test image signal;
• and
• a message image output circuit which outputs the message image signal adjusted by the image adjustment circuit.