33results about How to "Speckle suppression" patented technology

The invention discloses a radar image speckle noise suppression method based on a correlation loss convolutional neural network, comprising: inputting a radar image into a trained convolutional neural network to obtain a result image suppressing speckle noise; a training method of the convolutional neural network It includes: superimposing speckle noise on the remote sensing image to obtain the superimposed speckle noise image, inputting the superimposed speckle noise image into the convolutional neural network, and obtaining the training output image; according to the mean square error of the remote sensing image and the training output image, the error loss is obtained , use the cross-correlation coefficient between the remote sensing image and the training output image to obtain the correlation loss; use the error loss and the correlation loss to perform backpropagation to update the weight parameters of the convolutional neural network; and then obtain the trained convolutional neural network. The invention utilizes the error loss and the correlation loss to update the weight parameter of the convolutional neural network, thereby effectively improving the radar image speckle noise suppression effect of the network.

To provide an illumination device and a projection type image display device that illuminate an area to be illuminated (image formation area) under conditions where speckle noise is less noticeable.An illumination device according to the present invention includes: a light source 11 that emits coherent light; an optical scanning section 15 that scans the coherent light emitted from the light source 11; and an optical path conversion system 21 configured to allow the coherent light scanned by the optical scanning section 15 to illuminate an area to be illuminated sequentially in an overlapping manner. An incident angle of the coherent light that enters respective points of the area to be illuminated changes with time.

The invention discloses a laser light source device, a projection system and a control method thereof. Optical coupling components are used to couple a laser beam to a multi-mode fiber for transmission. The laser beam passing through the multi-mode fiber will produce random propagation time changes, thereby destroying the laser beam. temporal coherence. Then, the laser beam passing through the multimode fiber is re-incident to the electro-refractive index changing component, and by applying a control signal to the electro-refractive index changing component, the refractive index of the medium at the incident position of the laser beam is changed, so that the light spot when the laser exits is changed. Spatial phase differences are created at different locations, thereby reducing the spatial coherence of the laser light. The laser beam passing through the electro-refractive index changing part is incident on the homogenizing part, so that the laser beam can be further homogenized. It can be seen that the above-mentioned laser light source device provided by the embodiment of the present invention can reduce the temporal and spatial coherence of the laser light at the same time, and effectively suppress the speckle generated by the laser light.