Aiming at the problems of poor brightness effect and poor recognition, a darkroom image enhancement algorithm based on Retinex algorithm is proposed, which replaces Gaussian filter with bilateral filter and adaptively adjusts the saturation of the darkroom image. The algorithm firstly converts the darkroom image from the three-primary color model (RGB) to the hue saturation value model (HSV). The Retinex algorithm is used to obtain the incident component and the reflection component of the darkroom image.The reflection component is sharpened by Laplace algorithm to enhance the brightness of the image and retain the color sense of the original image, and the incident component is processed by bilateral filtering. In this way, the visual display effect of images can be improved. Finally, the adaptive adjustment strategy of correlation coefficient is adopted for the saturation component in HSV space, so that the saturation component can adjust itself and maintain the global color of the image. Compared with histogram equalization (HE) algorithm and single-scale Retinex(SSR) algorithm, this algorithm can effectively solve the problems of color loss and edge information loss in darkroom images.
An admirable and efficient Nd:YVO4 laser at 1085 nm is demonstrated with a compact 35 mm plano-plano cavity. A chosen narrow bandpass filter with high-transmittance (HT) coating at 1064 nm (T=96%) and optimized part-reflection (PR) coating at 1085 nm (T=15%) is used as the output coupler. In the continuous-wave (CW) regime, the maximum output power reaches 3110 mW at the pump power of 11.41 W. Based on a Cr:YAG crystal with initial-transmittance of 91%, the first passively Q-switched Nd:YVO4 laser at 1085 nm is achieved. When the pump power is changed from the threshold of 4.50 to 6.08 W, the dual-wavelength lines at 1064 and 1085 nm are generated simultaneously. However, at the pump power of above 6.08 W, the single-wavelength line at 1085 nm is achieved. The largest output power, the highest peak power, and the narrowest pulse width are 1615 mW, 878 W and 26.2 ns, respectively.
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