Line determination apparatus, line determination method, and computer-readable medium

An image processing method comprising:

• receiving a set of information indicating (i) information on an image having a possibility of being a line and (ii) a line element being a rectangular pixel lump which constitutes a line;
• determining whether or not each target line element in the image matches a predicted value of the target line element based on the received information indicating the line element, the predicted value indicating a line element which is predicted when the target line element constitutes a line at a position of the target line element;
• calculating a feature amount of the image when it is determined that the target line element does not match the predicted value, the feature amount of the image being calculated as equal to a number of observation failures divided by the number of target line elements;
• and
• determining whether or not the image is a line based on the calculated feature amount, wherein
• an observation failure exists when (a) the line element is not at the position of the target line element, (b) the target line element has a thickness less than a predetermined threshold, or (c) position of the target line element is too distant from a predicted position of the target line element.

A non-transitory computer-readable medium storing a program that causes a computer to execute image processing, the image processing comprising:

• receiving a set of information indicating (i) information on an image having a possibility of being a line and (ii) a line element being a rectangular pixel lump which constitutes a line;
• determining whether or not each target line element matches a predicted value of the target line element based on the received information indicating the line element, the predicted value indicating a line element which is predicted when the target line element constitutes a line at a position of the target line element;
• calculating a feature amount of the image when it is determined that the target line element does not match the predicted value, the feature amount of the image being calculated as equal to a number of observation failures divided by the number of target line elements;
• and
• determining whether or not the image is a line based on the calculated feature amount, wherein
• an observation failure exists when (a) the line element is not at the position of the target line element, (b) the target line element has a thickness less than a predetermined threshold, or (c) the position of the target line element is too distant from a predicted position of the target line element.