Figure 2. 2D edge detection demonstration of intensity object (R3L3S1N Negative 1951 USAF Target). (IMAGE) Science China Press Caption a-d. Result is taken by removing the second polarizer. e-h. Edge images at the wavelength of 410 nm, 540 nm, 690 nm, and white light, respectively. Credit @Science China Press Usage Restrictions Use with credits License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.