Stereoscopic image display device, stereoscopic image display method, and program

A stereoscopic image display method comprising:

• acquiring an observation viewing distance that is a viewing distance from a display part to a user;
• calculating a parallax adjustment amount and a scale adjustment amount,
• the parallax adjustment amount being an amount to adjust a depth distortion of a display image,
• the scale adjustment amount being an amount to adjust a scale of the display image;
• and
• adjusting a display state of the display image based on a reference viewing distance and the observation viewing distance, and adjusting the display state of the display image based on the reference viewing distance and the observation viewing distance so that a width and a depth of a stereoscopic image visually recognized at the observation viewing distance are fixed;
• and
• displaying the stereoscopic image based on the display state, wherein
• the parallax adjustment amount is calculated based on the reference viewing distance, the observation viewing distance and a parallax,
• the scale adjustment amount is calculated based on the reference viewing distance, the observation viewing distance, the parallax, and an eye width,
• a width of the stereoscopic image visually recognized at the reference viewing distance is defined as a first width, and a distance from the display part to an imaging position of the stereoscopic image visually recognized at the reference viewing distance is defined as a first distance,
• the width of the stereoscopic image visually recognized at the observation viewing distance are defined as a second width, and the distance from the display part to the imaging position of the stereoscopic image visually recognized at the observation viewing distance is defined as a second distance,
• the display state of the display image is adjusted by controlling the parallax adjustment amount and the scale adjustment amount so that the second width is equal to the first width and the second distance is equal to the first distance.

A non-transitory computer readable medium that stores a program causing a computer to function as:

• a display part;
• an acquisition part configured to acquire an observation viewing distance that is a viewing distance from the display part to a user;
• a calculation part configured to calculate a parallax adjustment amount and a scale adjustment amount,
• the parallax adjustment amount being an amount to adjust a depth distortion of a display image,
• the scale adjustment amount being an amount to adjust a scale of the display image;
• and
• an adjustment part configured to adjust a display state of the display image based on a reference viewing distance and the observation viewing distance, wherein
• the display part is configured to display a stereoscopic image based on the display state,
• the calculation part calculates the parallax adjustment amount based on the reference viewing distance, the observation viewing distance and a parallax,
• the calculation part calculates the scale adjustment amount based on the reference viewing distance, the observation viewing distance, the parallax, and an eye width,
• a width of the stereoscopic image visually recognized at the reference viewing distance is defined as a first width, and a distance from the display part to an imaging position of the stereoscopic image visually recognized at the reference viewing distance is defined as a first distance,
• the width of the stereoscopic image visually recognized at the observation viewing distance are defined as a second width, and the distance from the display part to the imaging position of the stereoscopic image visually recognized at the observation viewing distance is defined as a second distance,
• the adjustment part is configured to adjust the display state of the display image by controlling the parallax adjustment amount and the scale adjustment amount so that the second width is equal to the first width and the second distance is equal to the first distance.