Bilateral filter

About: Bilateral filter is a research topic. Over the lifetime, 3500 publications have been published within this topic receiving 75582 citations.

Joint-adaptive bilateral depth map upsampling

Abstract: In this paper, we present a new depth upsampler in which an upsampled depth map is computed at each pixel as the average of neighboring pixels, weighted by color and depth intensity filters. The proposed method features two parameters, an adaptive smoothing parameter and a control parameter. The adaptive smoothing parameter is determined based on the ratio between a depth map and its corresponding color image. The adaptive smoothing parameter is used to control the dynamic range of the color-range filter. The control parameter assigns a larger weighting factor to pixels in the object to which a missing pixel belongs. In a comparison with five existing upsamplers, the proposed method outperforms all five in terms of both objective and subjective quality.

System and method for edge ehnancement of images

Abstract: The invention provides a method for generating an enhanced image, the method including the steps of: (a) receiving a matrix of pixels representative of an image; (b) generating a gradient image representative of a difference between values of adjacent pixels; (c) calculating a center of mass for each pixel of the gradient image in response to gradient intensity values and location values of neighboring pixels; and (d) generating an enhanced image by modifying intensity values of pixels of the matrix of pixels that are located in a vicinity of local centers of mass in response to intensity values of pixels that are further displaced from the local centers of mass. The invention provides a method for generating an enhanced image, the method including the steps of: (a) receiving a matrix of pixels representative of an image; (b) estimating at least one edge of the image; and (c) generating an enhanced image by modifying intensity values of pixels of the matrix of pixels that are located in a vicinity of the at least one estimated edge in response to intensity values of pixels that are further displaced from the at least one edge.

Method and system for color image defogging treatment

Abstract: The invention discloses a method and a system for color image defogging treatment to realize real scene restoration of a degraded video/image. The method comprises the following steps of obtaining color components of each pixel point of the degraded image; obtaining a sky brightness color component estimated value by estimating each color component of the sky brightness of the degraded image; treating the degraded image by utilizing the sky brightness color component estimated value and the color components of each pixel point, and obtaining a crudely estimated atmospheric dissipation image; obtaining an atmospheric dissipation image after bilateral filtering treatment by bilaterally filtering the crudely estimated atmospheric dissipation image; carrying out defogging reduction treatment on the degraded image by utilizing the atmospheric dissipation image after bilateral filtering treatment. Therefore, in the invention, the atmospheric dissipation image is obtained by treating the color degraded image, the sky brightness color is estimated, and finally, a real scene image is restored according to the sky brightness estimated value and the atmospheric dissipation image, thereby achieving the defogging effect.

Flash/no-flash image integration using convex optimization

Abstract: When high ISO sensitivity is used to acquire images of dark scenes, their detail textures are often deteriorated by sensor noise. On the other hand, using flash photography with artificial light, one can shorten the exposure time, and obtain a sharp image under the low ISO sensitivity. However, the use of flash light changes the color tone and often generates unnatural images due to a specific color temperature of the additional light. This paper presents a new efficient method for flash/no-flash image integration. In contrast to conventional integration methods assuming that the flash image has a sharp texture without any noise, our method can successfully remove noise. Specifically, our method separately handles regions within the reach of the flash light and other regions out of range of the flash light, because the two regions have much different characteristics. As for the former well-exposed regions, we transferred the detail of the flash image to no-flash image by optimization and component separation. As for the latter under-exposed regions, an optimization based joint bilateral filtering that uses information of a flash image is performed to remove noise. Experimental results show the effectiveness of our method compared to the conventional methods.

Image processing apparatus and storage medium for storing image processing program

Abstract: Smoothing that uses pieces of color information of at least one color component of a target pixel and of pixels adjacent to the target pixel among a plurality of pixels that form image data is performed selectively for at least one color component of the target pixel. The smoothing is in accordance with correlation between the target pixel and pixels in the vicinity of the target pixel. Since the entire image data is not smoothed uniformly, the smoothing can be performed so as to leave structures inherent to the original image.