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Image scaling curve generation

A technology of image zooming and curves, applied in image communication, image data processing, graphics and image conversion, etc., can solve problems such as complex calculation, lack of time consistency, and wrong encoding of source video

Inactive Publication Date: 2011-11-30
TP VISION HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When applied in TVs in the market, this method has the disadvantage that if the source video is incorrectly encoded (like many videos downloaded from Internet shows) or for movies with a 2.35:1 movie aspect ratio (which even requires 16:9 widescreen TV), the method fails
Fortunately, the important stuff to preserve is highly dependent on low level visual salience which can be well modeled, but in some cases it might even depend on high level aspects of the underlying story
[0009] The proposed state-of-the-art methods for aspect ratio correction or repositioning of perceptual content often lack temporal consistency, are computationally complex, or in some cases introduce unacceptable distortions

Method used

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Embodiment Construction

[0036] One embodiment of the invention is based on the idea of ​​taking an initial set of scaling curves and then calculating a cost value for these curves. A new scaling curve to be used in the actual image scaling is calculated such that the result is a weighted average of the individual curves, where the weights are inversely related to the aforementioned costs. Thus, by viewing the video sequence itself, the system does not rely on any metadata, which may even be wrong if available.

[0037] image 3 Three exemplary zoom curves are shown and more particularly a magnification curve describing a local magnification is shown. These curves are: a linear zoom curve with constant magnification, a linear zoom curve with negative magnification, and the so-called "bathtub" curve used in panorama stretching. The shape of the bathtub curve is such that unit scaling is used at the center of the image, while the magnification increases towards the edges of the image. Unit scaling at...

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Abstract

The invention relates to a method of generating an image scaling curve, wherein local saliency is detected in a received image. The detected local saliencies are then accumulated in a first direction. A final scaling curve is derived from the detected local saliency and the image is then possibly rescaled in a second direction by using the derived scaling curve, wherein the second direction is substantially perpendicular to the first direction.

Description

technical field [0001] The invention relates to a method of generating an image scaling curve for correcting the aspect ratio of an image or image sequence. More specifically, the method relies on detecting local saliency in images. The invention also relates to a corresponding apparatus and a computer program product comprising instructions for implementing the steps of the method. Background technique [0002] Recent developments in the field of display technology have revealed enormous diversity in display sizes. Displays are changing from low-resolution handheld devices to high-definition widescreen TVs. Computing and communications infrastructures are also evolving to support images and video onto this ever-expanding set of potential displays. Visual content is becoming more important for sharing, expressing and exchanging information on devices such as cell phones and handheld personal computers (PCs), video-capable personal digital assistants (PDAs) and home networ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/44
CPCG06T3/0093H04N7/0122G06T3/18G06T3/40H04N5/44
Inventor G.德哈安C.达姆卡特
Owner TP VISION HLDG