System and method for increasing the bit depth of images

An image and pixel value technology, applied in the field of increasing the bit depth of images and videos, can solve problems such as increasing images

Active Publication Date: 2017-05-10
GOOGLE LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Additionally, increasing the bit depth of an image results in a corresponding increase in both the space required to store the image and the amount of data that must be transmitted in order to send the image over the network

Method used

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  • System and method for increasing the bit depth of images
  • System and method for increasing the bit depth of images
  • System and method for increasing the bit depth of images

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Embodiment Construction

[0021] The systems and methods described herein relate to increasing the bit depth of digital images by applying threshold-based blurring at multiple scales. Automatically determines the size of the blur by applying the blur at multiple scales. By applying a per-scale threshold, the need to explicitly segment images based on their content is avoided. Each blur operation and threshold operation can be applied individually to discrete regions of the image, such as groups of pixels, to localize the effects of the blur and maintain edge characteristics. Optionally, filtering operations can be applied by using an offset copy of the image to ensure smooth interpolation.

[0022] figure 1 is a block diagram illustrating an example of an environment 100 in which a system for increasing the bit depth of an image may be implemented. Environment 100 includes a transmitting station 110 and a receiving station 120 connected by a network 130 . Transmitting station 110 and receiving stat...

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Abstract

Processing an image having a first bit depth includes performing two or more iterations of a bit depth enhancement operation that increases the bit depth of the image to a second bit depth that is higher than the first bit depth. The bit depth enhancement operation includes dividing the image into a plurality of areas, performing an edge detection operation to identify one or more areas from the plurality of areas that do not contain edge features, and applying a blur to the one or more areas from the plurality of areas that do not contain edge features. In a first iteration of the of the bit depth enhancement operation, the plurality of areas includes a first number of areas, and the number of areas included in the plurality of areas decreases with each subsequent iteration of the bit depth enhancement operation.

Description

Background technique [0001] Digital images and video are represented by pixels, each of which has a color value. The number of colors that can be used to represent an individual pixel is a function of the number of bits used to describe the color. Increasing the number of bits used to represent a color increases the number of colors that can be represented. This is called bit depth. [0002] Images are often stored and / or transmitted with a bit depth of eight bits per pixel per color. Objectionable visual artifacts become apparent due to bit depth when viewed on a display with high resolution and high contrast. A common and very noticeable visual artifact known as "banding" or "false contouring" that appears in areas of an image where there should be smooth gradual color transitions (ie, gradients) However, the times are represented by colored bands with sharp boundaries between them. These artifacts can be eliminated by storing images and video at higher bit depths, wher...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00G06T7/13G06T7/136
CPCG06T5/002G06T5/007G06T2207/20021G06T2207/20016G06T2207/20192H04N19/85G06T7/13G06T7/136G06T5/001G06T7/00G06T7/40G06T9/00G06T9/20H04N19/00G06T3/40
Inventor 安德鲁·伊安·拉塞尔
Owner GOOGLE LLC
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