Method of evaluating front of screen quality and apparatus for evaluating front of screen quality using the same
AssigneeInternational Business Machines Corporation
InventorsKosei Tanahashi, Yumi Mori
Life of this patent
Estimating the term…
Abstract
In the method of quantitatively evaluating the front of screen quality of a screen to be checked, an image of the screen to be checked is captured. The image of the LCD panel is captured preferably in a state in which the screen to be checked of the LCD panel is on. The captured image is processed and evaluated preferably in accordance with a predetermined algorithm. In the present invention, a manual evaluation is not performed at all. Thus, the front of screen quality of the screen to be checked of the LCD panel or the like, for example, can be quantitatively evaluated.
Claims6
A method of quantitatively evaluating a front of screen quality to be checked, comprising the steps of:
- capturing an image of the screen to be checked;
- and
- processing and evaluating the captured image;
- wherein said image processing and evaluation is executed in accordance with a front of screen quality index (L) obtained from a differentiated image calculated by differentiating the captured image;
- wherein said differentiated image is scaled into n gray levels, and said front of screen quality index (L) is calculated in accordance with the following equation:
- L = ∑ i = 1 n Si * Ii
- where
- Si:
- an area ratio of a region having the i-th differential value, and
- Ii:
- the i-th differential value.
A method of quantitatively evaluating a front of screen quality to be checked, comprising the steps of:
- capturing an image of the screen to be checked;
- and
- processing and evaluating the captured image;
- wherein said image processing and evaluation is executed in accordance with a front of screen quality index (L) obtained from a differentiated image calculated by differentiating the captured image;
- wherein said differentiated image is scaled into n gray levels, and said front of screen quality index (L) is calculated in accordance with the following equation:
- L = ∑ i = 1 n Si * ( Ii - Ib )
- where
- Si:
- an area ratio of a region having the i-th differential value, and
- Ii:
- the i-th differential value, and
- Ib:
- a background value.
A method of quantitatively evaluating a front of screen quality to be checked, comprising the steps of:
- capturing an image of the screen to be checked;
- and
- processing and evaluating the captured image;
- wherein said image processing and evaluation is executed in accordance with a front of screen quality index (L) obtained from a differentiated image calculated by differentiating the captured image;
- wherein said differentiated image is scaled into n gray levels, and said front of screen quality index (L) is calculated in accordance with the following equation:
- L = ∑ i = 1 n Si * Ii * d i or L = ∑ i = 1 n Si * ( Ii - Ib ) * d i
- where
- Si:
- an area ratio of a region having the i-th differential value, and
- Ii:
- the i-th differential value, and
- Ib:
- a background value, and
- di:
- the i-th weighting.
Dependencies are inferred from the claim text.