Heads up display, heads up display method, and traveling apparatus

A heads up display, comprising:

• a projector, which is configured to project light to a preset region to display a projected image;
• an environment color acquisition device, which is configured to acquire at least one environment color of a background region corresponding to the preset region, the background region being an external region observable through the preset region from an observer's position;
• and
• a controller, comprising a color control unit, the color control unit being configured to control a color of light projected by the projector according to the at least one environment color, such that a color of the projected image and the at least one environment color are distinguished from each other, wherein
• when a plurality of environment colors are acquired by the environment color acquisition device, each of the environment colors has a single hue in a hue circle, and the environment color acquisition device is configured to determine a coverage area of each of the plurality of environment colors in the background region,
• the color control unit is configured to acquire a complementary color of each environment color and provide it to the projector,
• the projector is configured to display, with respect to the coverage area of each environment color in the background region, the projected image in the complementary color of the environment color within a corresponding coverage area of the environment color, and the color control unit comprises:
• a storage sub-unit, configured to store the hue circle,
• an environment hue determination sub-unit, configured to determine, when environment colors whose hues have an included angle no more than 45° exist in the plurality of environment colors, an average hue of the environment colors whose hues have an included angle no more than 45° in the hue circle as a first hue in the hue circle corresponding to the environment colors whose hues have an included angle no more than 45°, and
• a complementary color acquisition sub-unit, configured to acquire a second hue at an opposite position to the first hue in the hue circle, and take a color corresponding to the second hue as the complementary color of the environment colors whose hues have an included angle no more than 45°.