Demosaicking is the process of reconstructing a full resolution color image from the sampled data... more Demosaicking is the process of reconstructing a full resolution color image from the sampled data acquired by a digital camera that apply a color filter array to a single sensor. In this paper, we propose a regularization approach to demosaicking, making use of some prior knowledge about natural color images, such as smoothness of each single color component and correlation between the different color channels. Initially, a quadratic strategy is considered and a general approach is reported. Then, an adaptive technique is analyzed, in order to improve the reconstruction near the edges and the discontinuities of the image. This is performed using a novel strategy that avoids computational demanding iterations. The proposed approach provides good performances and candidates itself for many applications. Moreover, since the response of the pixel sensors can be taken into account, it can handle nonideal acquisition devices.
2006 14th European Signal Processing Conference, 2006
In this paper a lossless compression technique for Bayer pattern images is presented. The common ... more In this paper a lossless compression technique for Bayer pattern images is presented. The common way to save these images was to colour reconstruct them and then code the full resolution images using one of the lossless or lossy methods. This solution is useful to show the captured images at once, but it is not convenient for efficient source coding. In fact, the resulting full colour image is three times greater than the Bayer pattern image and the compression algorithms are not able to remove the correlations introduced by the reconstruction algorithm. However, the Bayer pattern images present new problems for the coding step. In fact, adjacent pixels belong to different colour bands mixing up different kinds of correlations. In this paper we present a lossless compression procedure based on an optimal vector predictor, where the Bayer pattern is divided into non-overlapped 2×2 blocks, each of them predicted as a vector. We show that this solution is able to exploit the existing c...
2006 14th European Signal Processing Conference, 2006
Demosaicing is the process of reconstructing the full dimension representation of an image captur... more Demosaicing is the process of reconstructing the full dimension representation of an image captured by a digital camera with a color filter array. The color filter array allows for only one color measuring for each pixel and the missing two colors have to be estimated. In literature many demosaicing techniques have been proposed but the reconstructed images are affected by some visible and annoying artifacts. In this paper we propose a new effective algorithm to reduce these artifacts. This algorithm improves the performances of the demosaicing reconstruction, increasing the visual quality of the resulting images. It can be applied directly after the color interpolation, or as an off-line post-processing to improve the image provided by the digital camera.
In a digital camera usually images are captured using a Color Filter Array (CFA), requiring a dem... more In a digital camera usually images are captured using a Color Filter Array (CFA), requiring a demosaicking process to reconstruct the full resolution color image. Often also a denoising step is neces-sary to remove the noise introduced by the sensor. In this paper we ...
Demosaicking is the process of reconstructing a full resolution color image from the sampled data... more Demosaicking is the process of reconstructing a full resolution color image from the sampled data acquired by a digital camera that apply a color filter array to a single sensor. In this paper, we propose a regularization approach to demosaicking, making use of some prior ...
Demosaicing is the process of reconstructing the full dimen-sion representation of an image captu... more Demosaicing is the process of reconstructing the full dimen-sion representation of an image captured by a digital camera with a color filter array. The color filter array allows for only one color measuring for each pixel and the missing two colors have to be ...
In this paper a lossless compression technique for Bayer pattern images is presented. The common ... more In this paper a lossless compression technique for Bayer pattern images is presented. The common way to save these images was to colour reconstruct them and then code the full resolution images using one of the lossless or lossy methods. This solution is ...
Most color digital cameras apply a color filter array to capture the scene, requiring an interpol... more Most color digital cameras apply a color filter array to capture the scene, requiring an interpolation of the subsampled color components to obtain the full resolution image. Therefore, if reconstruction is not performed correctly, noticeable arti-facts are produced, which result more evident ...
Proc. of European Conference on Visual Media Production (CVMP), Nov 1, 2005
A digital camera provided with a Bayer pattern single sensor needs colour interpolation to recons... more A digital camera provided with a Bayer pattern single sensor needs colour interpolation to reconstruct a full colour image, and compression to reduce its data rate. In the digital cinema these two steps influence each other, ie different interpolation algorithms lead to different compression ratios, and, on the other hand, the losses introduced by the compression influence the results of the colour interpolation.
Demosaicking is the process of reconstructing a full resolution color image from the sampled data... more Demosaicking is the process of reconstructing a full resolution color image from the sampled data acquired by a digital camera that apply a color filter array to a single sensor. In this paper, we propose a regularization approach to demosaicking, making use of some prior knowledge about natural color images, such as smoothness of each single color component and correlation between the different color channels. Initially, a quadratic strategy is considered and a general approach is reported. Then, an adaptive technique is analyzed, in order to improve the reconstruction near the edges and the discontinuities of the image. This is performed using a novel strategy that avoids computational demanding iterations. The proposed approach provides good performances and candidates itself for many applications. Moreover, since the response of the pixel sensors can be taken into account, it can handle nonideal acquisition devices.
2006 14th European Signal Processing Conference, 2006
In this paper a lossless compression technique for Bayer pattern images is presented. The common ... more In this paper a lossless compression technique for Bayer pattern images is presented. The common way to save these images was to colour reconstruct them and then code the full resolution images using one of the lossless or lossy methods. This solution is useful to show the captured images at once, but it is not convenient for efficient source coding. In fact, the resulting full colour image is three times greater than the Bayer pattern image and the compression algorithms are not able to remove the correlations introduced by the reconstruction algorithm. However, the Bayer pattern images present new problems for the coding step. In fact, adjacent pixels belong to different colour bands mixing up different kinds of correlations. In this paper we present a lossless compression procedure based on an optimal vector predictor, where the Bayer pattern is divided into non-overlapped 2×2 blocks, each of them predicted as a vector. We show that this solution is able to exploit the existing c...
2006 14th European Signal Processing Conference, 2006
Demosaicing is the process of reconstructing the full dimension representation of an image captur... more Demosaicing is the process of reconstructing the full dimension representation of an image captured by a digital camera with a color filter array. The color filter array allows for only one color measuring for each pixel and the missing two colors have to be estimated. In literature many demosaicing techniques have been proposed but the reconstructed images are affected by some visible and annoying artifacts. In this paper we propose a new effective algorithm to reduce these artifacts. This algorithm improves the performances of the demosaicing reconstruction, increasing the visual quality of the resulting images. It can be applied directly after the color interpolation, or as an off-line post-processing to improve the image provided by the digital camera.
In a digital camera usually images are captured using a Color Filter Array (CFA), requiring a dem... more In a digital camera usually images are captured using a Color Filter Array (CFA), requiring a demosaicking process to reconstruct the full resolution color image. Often also a denoising step is neces-sary to remove the noise introduced by the sensor. In this paper we ...
Demosaicking is the process of reconstructing a full resolution color image from the sampled data... more Demosaicking is the process of reconstructing a full resolution color image from the sampled data acquired by a digital camera that apply a color filter array to a single sensor. In this paper, we propose a regularization approach to demosaicking, making use of some prior ...
Demosaicing is the process of reconstructing the full dimen-sion representation of an image captu... more Demosaicing is the process of reconstructing the full dimen-sion representation of an image captured by a digital camera with a color filter array. The color filter array allows for only one color measuring for each pixel and the missing two colors have to be ...
In this paper a lossless compression technique for Bayer pattern images is presented. The common ... more In this paper a lossless compression technique for Bayer pattern images is presented. The common way to save these images was to colour reconstruct them and then code the full resolution images using one of the lossless or lossy methods. This solution is ...
Most color digital cameras apply a color filter array to capture the scene, requiring an interpol... more Most color digital cameras apply a color filter array to capture the scene, requiring an interpolation of the subsampled color components to obtain the full resolution image. Therefore, if reconstruction is not performed correctly, noticeable arti-facts are produced, which result more evident ...
Proc. of European Conference on Visual Media Production (CVMP), Nov 1, 2005
A digital camera provided with a Bayer pattern single sensor needs colour interpolation to recons... more A digital camera provided with a Bayer pattern single sensor needs colour interpolation to reconstruct a full colour image, and compression to reduce its data rate. In the digital cinema these two steps influence each other, ie different interpolation algorithms lead to different compression ratios, and, on the other hand, the losses introduced by the compression influence the results of the colour interpolation.
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Papers by Daniele Menon