Image processing apparatus and image processing method

An image processing method, comprising:

• executing an image projection process based on a pulse width modulation (PWM) method;
• setting a first portion of a single-frame output period of a view-use image as a first period for output of a pattern image;
• setting a second portion of the single-frame output period as a second period for output of the view-use image, wherein the second period of the single-frame output period is different from the first period of the single-frame output period;
• controlling output of the pattern image in the first period, and the view-use image in the second period;
• receiving, from a camera, a captured image of the pattern image output in the first period;
• calculating an image correction parameter based on the captured image of the pattern image;
• and
• executing a correction process on the view-use image based on the calculated image correction parameter.

A non-transitory computer-readable medium having stored thereon, computer-executable instructions which, when executed by a processor, cause the processor to execute operations, the operations comprising:

• executing an image projection process based on a pulse width modulation (PWM) method;
• setting a first portion of a single-frame output period of a view-use image as a first period for output of a pattern image;
• setting a second portion of the single-frame output period as a second period for output of the view-use image, wherein the second period of the single-frame output period is different from the first period of the single-frame output period;
• controlling output of the pattern image in the first period, and the view-use image in the second period;
• receiving, from a camera, a captured image of the pattern image output in the first period;
• calculating an image correction parameter based on the captured image of the pattern image;
• and
• executing a correction process on the view-use image based on the calculated image correction parameter.

An image processing apparatus, comprising:

• an image projection section configured to execute an image projection process based on a pulse width modulation (PWM) method;
• an output image control section configured to:
• set a portion of a single-frame output period of a view-use image as a period for output of a pattern image;
• and
• control the period of the output of the pattern image such that pixel values of the pattern image fall within a range from a minimum pixel value to less than a minimum significant pixel value of the view-use image;
• a correction parameter calculation section configured to:
• receive a captured image of the pattern image from a camera, wherein the camera captures the pattern image in the period of output of the pattern image;
• and
• calculate an image correction parameter based on the captured image of the pattern image;
• and
• an image correction section configured to perform a correction process on the view-use image based on the image correction parameter.

An image processing apparatus, comprising:

• an image projection section configured to execute an image projection process based on a pulse width modulation (PWM) method;
• an output image control section configured to:
• set a first portion of a first single-frame output period of a view-use image as a first period for output of a pattern image;
• set a second portion of the first single-frame output period as a second period for output of a composite image, wherein
• the composite image is a combination of the view-use image and the pattern image, and
• the second period of the first single-frame output period is different from the first period of the first single-frame output period;
• and
• control output of the pattern image in the first period, and the composite image in the second period;
• and
• a correction parameter calculation section configured to:
• receive, from a camera, a captured image of the pattern image output in the first period;
• and
• calculate an image correction parameter based on the captured image of the pattern image;
• and
• an image correction section configured to execute a correction process on the view-use image based on the calculated image correction parameter.