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A method for downsample an image

An image and original image technology, which is applied in the field of image downsampling, can solve the problems of not considering the loss of original image information, not being suitable for image compression tasks, and the actual image signal is difficult to meet, so as to achieve accurate image reconstruction and strong robustness and adaptive, detail-rich effects

Inactive Publication Date: 2019-01-18
UNIV OF SCI & TECH OF CHINA
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Problems solved by technology

[0008] 1. The design of the downsampling filter in these methods is based on signal processing theory, and its optimality guarantee requires the assumption that the input signal is stable, but the actual image signal is difficult to satisfy this assumption
[0009] 2. The downsampling filters in these methods are all designed for a single target and cannot meet multiple application requirements at the same time. For example, the downsampling algorithm based on pixel seam cropping does not consider the information loss of restoring the original image from the downsampled image, so it can only be used Useful for image redirection, not suitable for image compression tasks

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Embodiment Construction

[0023] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0024] An embodiment of the present invention provides an image down-sampling method, such as figure 1 As shown, it mainly includes:

[0025] 1. Based on data-driven training downsampling filter.

[0026] The core of the embodiment of the present invention is to train the downsampling filter, so as to increase the robustness of the downsampling filter and the adaptability to the image content. The whole training process will be described in detail...

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Abstract

A method for downsample an image is disclosed. The downsampling filter is trained by data-driven method, which has stronger robustness and adaptability to the image content. The two loss functions used in the training process make the downsampling filter have many characteristics: the visual effect is better than the general downsampling filter, and seems to be rich in detail; Compared with the general downsampling filter, the bit rate increase caused by the downsampling image compression is almost negligible. At that same time, after restoring the original image from the down-sampled image, amore accurate reconstruct image can be provided.

Description

technical field [0001] The invention relates to the technical field of digital image processing, in particular to an image down-sampling method. Background technique [0002] Digital image processing technology plays an important role in multimedia and computer vision tasks. Common digital image processing technologies include variable sampling, denoising, super-resolution, etc. Variable sampling of digital images includes downsampling and upsampling, and common application scenarios of downsampling technology include image redirection and image compression. In image redirection, the resolution of the input source image is higher than that of the target display device. In order to display the source image on the target display device, it needs to be down-sampled. In this task, the goal is generally to make the subjective quality of the low-resolution image after downsampling good, and to preserve as much detail as possible in the original image. In the image compression ta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T9/00
CPCG06T9/002
Inventor 刘东李跃李厚强吴枫
Owner UNIV OF SCI & TECH OF CHINA
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