Image processing device and image processing method

An image processing device comprising:

• input means which accepts inputs of a first input image, a second input image that a virtual image has been superimposed on the first input image at a first transmittance, and a third input image that the virtual image has been superimposed on the first input image at a maximum brightness;
• arithmetic operation means which, by comparison between results of arithmetic operations performed on a composite image obtained by adding together values that the second input image and the third input image have been multiplied respectively by a second transmittance and a value that the second transmittance has been subtracted from 1 and on the first image, calculates a value indicating the visibility at the second transmittance;
• and
• updating means which updates the second transmittance in accordance with a result of comparison between the value indicating the visibility at the second transmittance and a target value, wherein
• the arithmetic operation means calculates again the value indicating the visibility by using the updated second transmittance.

An image processing method for the image processing device comprising:

• the step of accepting inputs of a first input image and a second input image that a virtual image has been superimposed on the first input image at a first transmittance;
• the step of, by comparison between results of arithmetic operations performed on a composite image obtained by adding together values that the first input image and the second input image have been multiplied respectively by a second transmittance which is lower than the first transmittance and a value that the second transmittance has been subtracted from 1 and on the first image, calculating a value indicating the visibility at the second transmittance;
• and
• the step of updating the second transmittance in accordance with a result of comparison between the value indicating the visibility at the second transmittance and a target value, wherein
• the arithmetic operation means calculates again the value indicating the visibility by using the updated second transmittance.

An image processing method for the image processing device comprising:

• the step of accepting inputs of a first input image, a second input image that a virtual image has been superimposed on the first input image at a first transmittance, and a third input image that the virtual image has been superimposed on the first input image at a maximum brightness;
• the step of, by comparison between results of arithmetic operations performed on a composite image obtained by adding together values that the second input image and the third input image have been multiplied respectively by a second transmittance and a value that the second transmittance has been subtracted from 1 and on the first image, calculating a value indicating the visibility at the second transmittance;
• and
• the step of updating the second transmittance in accordance with a result of comparison between the value indicating the visibility at the second transmittance and a target value, wherein
• the arithmetic operation means calculates again the value indicating the visibility by using the updated second transmittance.

A non-transitory storage medium storing a program which makes a computer execute:

• a process of accepting inputs of a first input image and a second input image that a virtual image has been superimposed on the first input image at a first transmittance;
• a process of, by comparison between results of arithmetic operations performed on a composite image obtained by adding together values that the first input image and the second input image have been multiplied respectively by a second transmittance which is lower than the first transmittance and a value that the second transmittance has been subtracted from 1 and on the first image, calculating a value indicating the visibility at the second transmittance;
• and
• a process of updating the second transmittance in accordance with a result of comparison between the value indicating the visibility at the second transmittance and a target value, wherein
• the arithmetic operation means calculates again the value indicating the visibility by using the updated second transmittance.

A non-transitory storage medium storing a program which makes a computer execute:

• a process of accepting inputs of a first input image, a second input image that a virtual image has been superimposed on the first input image at a first transmittance, and a third input image that the virtual image has been superimposed on the first input image at a maximum brightness;
• a process of, by comparison between results of arithmetic operations performed on a composite image obtained by adding together values that the second input image and the third input image have been multiplied respectively by a second transmittance and a value that the second transmittance has been subtracted from 1 and on the first image, calculating a value indicating the visibility at the second transmittance;
• and
• a process of updating the second transmittance in accordance with a result of comparison between the value indicating the visibility at the second transmittance and a target value, wherein
• the arithmetic operation means calculates again the value indicating the visibility by using the updated second transmittance.