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Method and apparatus for downscaling a digital colour matrix image

A technology of color matrix and matrix, which is applied in the field of reducing digital color matrix images and devices, and can solve the problem of losing original information, etc.

Inactive Publication Date: 2007-04-04
NOKIA CORP
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this method, the intermediate pixels are skipped, so the original information is lost

Method used

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  • Method and apparatus for downscaling a digital colour matrix image
  • Method and apparatus for downscaling a digital colour matrix image
  • Method and apparatus for downscaling a digital colour matrix image

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Embodiment Construction

[0028] According to Figure 1, the input image (I 1 ) and the output matrix (I 2 ) overlap each other such that each pixel of the output matrix is ​​affected by the original pixel. Scaling is the process of forming an output image with a lower resolution from an input image. For simplicity, Figures 1 to 5 mainly discuss the scaling of black and white images, while the special characteristics of scaling color images will become apparent later.

[0029] The image is of size I 1 :M 1 ×N 1 and I 2 :M 2 ×N 2 . The pixels are treated as regions rather than points. For the input image, the pixel size is set to Sx 1 × Sy 1 , and for the output image, the pixel size is set to Sx 2 × Sy 2 . The image size is set to L "units" such that L=Sx 1 m 1 =Sx 2 m 2 = pixel size × number of pixels, so that Sx 1 / Sx 2 = M 2 / M 1 =c×M 2 / c×M 1 .

[0030] The pixel size is calculated as follows:

[0031] S x 1 =c×M 2 ,as well as

[0032] S x 2 =c×M 1 ,

[0033] c can be...

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Abstract

The invention relates to a method and apparatus for downscaling a digital matrix image by selected ratios. The value of each output pixel of the output matrix is calculated from the values of the input pixels. The output pixels (k,l) are processed in such a way that the weighted sum of the values of the pixels (i,j) of the matrix image in the area of each output pixel (k,l) is formed, the weighting coefficient being the dimension share of the pixel (i,j) in the area of the output pixel (k,l) and each weighted sum is corrected by a scaling factor (f x M2 / M1 x N2 / N1).

Description

technical field [0001] The present invention relates to a method in a selected ratio M 2 / M 1 and N 2 / N 1 Method and apparatus for reducing a digital color matrix image, wherein the matrix image includes N 1 line, each line includes M 1 pixels, so that the intensity values ​​of the pixels constitute the matrix, and the pixels of different colors constitute the selected format; and wherein the size is M by scaling 2 ×N 2 The output matrix, the pixels of the output matrix are in M 2 <= M 1 and N 2 <=N 1 The way corresponds to the subset of the original matrix, and the value of each output pixel of the output matrix is ​​calculated from the intensity value of the pixel of the original matrix. Background technique [0002] When using a digital video camera, a camera sensor is used to generate individual images or video images. Sensor images can be in various image formats such as RGB8:8:8, RGB5:6:5, YUV4:2:0, and raw-Bayer images. When an image is displayed in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T3/40
CPCG06T3/4015G06T3/4007G06T3/00G06T3/40H04N7/01
Inventor M·豪基伽尔维O·卡莱沃
Owner NOKIA CORP
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