Image measurement device and method thereof

An image measurement device comprising:

• an optical system that transmits light to an image detection unit;
• the image detection unit configured to detect the light and generate an image;
• and
• an image processing unit that extracts spectral data from the image,
• wherein the optical system comprises a relay lens including at least one lens and a self-interference structure configured to self-interfere the light, and
• the self-interference structure comprises a polarizer that polarizes the light and a retarder that delays a phase of the light.

An image measurement device comprising:

• an optical system that transmits light to an image detection unit;
• the image detection unit configured to detect the light and generate an image;
• and
• an image processing unit that extracts spectral data from the image,
• wherein the optical system comprises a relay lens including at least one lens and a self-interference structure configured to self-interfere the light, and
• the self-interference structure comprises a polarizer that polarizes the light and a retarder that delays the phase of the light, and
• the image processing unit generates a profile according to an amount of light for each of a plurality of pixels based on the image and performs Fourier transform on the profile,
• the image processing unit separates the profile into a high-frequency region and a low-frequency region by performing Fourier transform on the profile, and
• divides the high-frequency region into a plurality of sections through windowing, and extracts frequency components by applying preset weights to the plurality of sections, and
• extracts spectral data from the frequency components by using zoom Fast Fourier transform.