Image processor for detecting specified pattern

A method of image processing comprising the steps of;

• deciding whether input color data of a target pixel exist in first ranges;
• deciding whether differences between color data of the target pixel and those of pixels adjacent thereto exist in second ranges different from the first ranges;
• and
• deciding that the target pixel has a specified color when the color data of the target pixel is decided to exist in the first ranges and the differences are decided to exist in the second ranges.

A recording medium to be executed by a computer storing a program comprising the steps of:

• deciding whether input color data of a target pixel exist in first ranges;
• deciding whether differences between color data of the target pixel and those of pixels adjacent thereto exist in second ranges different from the first ranges;
• and
• deciding that the target pixel has a specified color when the color data of the target pixel is decided to exist in the first ranges and the differences are decided to exist in the second ranges.

An image processor comprising:

• a first decision controller which decides whether input color data of a target pixel exist in first ranges;
• a second decision controller which performs calculation on the input color data of the target pixel and decides whether results of the calculation exist in second ranges different from the first ranges;
• and
• a color decision controller which decides that the target pixel has a specified color when the first decision controller decides that the color data of the target pixel exist in the first ranges and the second decision controller decides that the results exist in the second ranges.

A method of image processing comprising the steps of:

• deciding whether input color data of a target pixel exist in first ranges;
• performing calculation on the input color data of the target pixel and decides whether results of the calculation exist in second ranges different from the first ranges;
• and
• deciding that the target pixel has a specified color when the color data of the target pixel are decided to exist in the first ranges and the results are decided to exist in the second ranges.

A recording medium to be executed by a computer storing a program comprising the steps of:

• deciding whether input color data of a target pixel exist in first ranges;
• performing calculation on the input color data of the target pixel and decides whether results of the calculation exist in second ranges different from the first ranges;
• and
• deciding that the target pixel has a specified color when the color data of the target pixel are decided to exist in the first ranges and the results are decided to exist in the second ranges.