Gloss measurement apparatus and gloss measurement method

A gloss measurement method that emits light from a light source and finds an evaluation value, which represents a glossiness of an object to be measured, on the basis of specular reflected light which is reflected by the object to be measured, the method comprising:

• acquiring image information in accordance with received light amounts, at predetermined respective pixels, of specular reflected light from a surface of the object to be measured;
• calculating gloss values of the respective pixels on the basis of the received light amounts of the respective pixels of the acquired image information;
• and
• calculating the evaluation value representing glossiness of the object to be measured on the basis of the calculated gloss values,
• wherein the gloss value for each of the pixels is calculated by summing values obtained by multiplying respectively different coefficients with each of light amounts of R, G, B for each of the pixels, and the different coefficients are determined by imaging a sample of which the specular gloss value is already known, finding average values of the light amounts of R, G, B of the pixels from the sample, and performing regression analysis using the average values and the known specular gloss value.

A storage medium readable by a computer, the storage medium storing a gloss measurement program including instructions which are executable by the computer to perform a function for:

• emitting light from a light source;
• acquiring image information in accordance with received light amounts, at predetermined respective pixels, of specular reflected light which is reflected by an object to be measured;
• and finding an evaluation value, which represents a glossiness of the object to be measured, on the basis of the acquired image information, the function comprising:
• a pixel gloss value calculation step that calculates gloss values of the respective pixels on the basis of the received light amounts of the respective pixels of the acquired image information;
• and
• an evaluation value calculation step that calculates the evaluation value representing glossiness of the object to be measured on the basis of the gloss values calculated by the pixel gloss value calculation step,
• wherein the gloss value for each of the pixels is calculated by summing values obtained by multiplying respectively different coefficients with each of light amounts of R, G, B for each of the pixels, and the different coefficients are determined by imaging a sample of which the specular gloss value is already known, finding average values of the light amounts of R, G, B of the pixels from the sample, and performing regression analysis using the average values and the known specular gloss value.

A gloss measurement apparatus that emits light from a light source and finds an evaluation value, which represents a glossiness of an object to be measured, on the basis of specular reflected light which is reflected by the object to be measured, the gloss measurement apparatus comprising:

• a specular reflection image information acquisition component, which acquires specular reflected light image information in accordance with received light amounts, at predetermined respective pixels, of specular reflected light from a surface of the object to be measured;
• and
• a calculation component, which calculates the evaluation value representing glossiness of the object to be measured on the basis of the specular reflected light image information acquired by the specular reflection image information acquisition component,
• wherein the gloss value for each of the pixels is calculated by summing values obtained by multiplying respectively different coefficients with each of light amounts of R, G, B for each of the pixels, and the different coefficients are determined by imaging a sample of which the specular gloss value is already known, finding average values of the light amounts of R, G, B of the pixels from the sample, and performing regression analysis using the average values and the known specular gloss value.

A gloss measurement method that emits light from a light source and finds an evaluation value, which represents a glossiness of an object to be measured, on the basis of specular reflected light which is reflected by the object to be measured, the method comprising:

• acquiring specular reflected light image information in accordance with received light amounts, at predetermined respective pixels, of specular reflected light from a surface of the object to be measured;
• and
• calculating the evaluation value representing glossiness of the object to be measured on the basis of the acquired specular reflected light image information,
• wherein the gloss value for each of the pixels is calculated by summing values obtained by multiplying respectively different coefficients with each of light amounts of R, G, B for each of the pixels, and the different coefficients are determined by imaging a sample of which the specular gloss value is already known, finding average values of the light amounts of R, G, B of the pixels from the sample, and performing regression analysis using the average values and the known specular gloss value.

A storage medium readable by a computer, the storage medium storing a gloss measurement program including instructions which are executable by the computer to perform a function for

• emitting light from a light source and finding an evaluation value, which represents a glossiness of an object to be measured, on the basis of specular reflected light which is reflected by the object to be measured, the function comprising:
• a storage step, for storing specular reflected light image information at an image information storage component, the specular reflected light image information being acquired in accordance with received light amounts, at predetermined respective pixels, of specular reflected light from a surface of the object to be measured;
• and
• an evaluation value calculation step, for calculating the evaluation value representing glossiness of the object to be measured on the basis of the specular reflected light image information which has been stored at the image information storage component,
• wherein the gloss value for each of the pixels is calculated by summing values obtained by multiplying respectively different coefficients with each of light amounts of R, G, B for each of the pixels, and the different coefficients are determined by imaging a sample of which the specular gloss value is already known, finding average values of the light amounts of R, G, B of the pixels from the sample, and performing regression analysis using the average values and the known specular gloss value.