Optical measurement device and the method using thereof

An optical measurement device, measuring a gap on an electronic device, wherein the electronic device includes a body and a component assembled on the body, the gap exists between the body and the component, the optical measurement device comprising:

• an image capture device, capturing an image including the gap;
• and
• an image processor, coupled to the image capture device, wherein the image processor receives the image and executes an image scanning operation on the image to measure a breadth of the gap,
• wherein the image scanning operation is to scan the image along a first direction to measure the breadth of the gap based on a scanning reference line, the gap is extending along a second direction, and the first direction is different from the second direction,
• wherein the image includes a texture region and a non-texture region, after the image scanning operation is executed on the image, the image processor determines whether the gap is located in the non-texture region, when the gap is determined in the non-texture region, the image processor confirms the breadth of the measured gap, when the gap is determined in the texture region, the image processor executes the image scanning operation on the image again to measure the breadth of the gap again.