US 2022/0191382 A1Published application

Image retrieving apparatus having image flicker detection mechanism and image flicker detection method of the same

AssigneeRealtek Semiconductor Corp.

InventorsXIAO-YU CHEN, DONG-YU HE, YANG LU, GANG SHEN

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Abstract

The present disclosure discloses an image flicker detection method that includes the steps outlined below. An image retrieving is performed to retrieve a current image. A current variation ratio between first rows of pixels of the current image and second rows of pixels in a previous image is calculated. When both the current variation ratio and a previous variation ratio are determined to be larger than a ratio threshold, a detected flicker number is incremented. When the detected flicker number is determined to be larger than a flicker number threshold, a flicker condition is determined to occur. When the detected flicker number is determined to be not larger than the flicker number threshold, the current image becomes the previous image and the current variation ratio becomes the previous variation ratio such that a next image becomes the current image to repeat the above steps.

Claims16

Dependent claims

An image retrieving apparatus having image flicker detection mechanism comprising:

an image retrieving circuit comprising a plurality of rows of light sensors and configured to perform image retrieving row by row;
a storage circuit configured to store computer executable instructions;
and
a processing circuit configured to execute the computer executable instructions to further execute an image flicker detection method comprising:
retrieving a current image by the image retrieving circuit;
calculating a current variation ratio between a plurality of rows of first row-pixels of the current image and a plurality of rows of corresponding second row-pixels in a previous image within a predetermined low frequency range;
incrementing a detected flicker number when the current variation ratio is determined to be larger than a ratio threshold value and a previous variation ratio corresponding to the previous image is also determined to be larger than the ratio threshold;
determining that a flicker condition occurs when the detected flicker number is determined to be larger than a flicker number threshold;
and
setting the current image to be the previous image, setting the current variation ratio to be the previous variation ratio and retrieving a next image by the image retrieving circuit to set the next image to be the current image when the detected flicker number is determined to be not larger than the flicker number threshold to repeat the above steps.

7 more elements

An image flicker detection method used in an image retrieving apparatus having image flicker detection mechanism, comprising:

retrieving a current image by an image retrieving circuit comprising a plurality of rows of light sensors and configured to perform image retrieving row by row;
calculating a current variation ratio between a plurality of rows of first row-pixels of the current image and a plurality of rows of corresponding second row-pixels in a previous image within a predetermined low frequency range;
incrementing a detected flicker number when the current variation ratio is determined to be larger than a ratio threshold value and a previous variation ratio corresponding to the previous image is also determined to be larger than the ratio threshold;
determining that a flicker condition occurs when the detected flicker number is determined to be larger than a flicker number threshold;
and
setting the current image to be the previous image, setting the current variation ratio to be the previous variation ratio and retrieving a next image by the image retrieving circuit to set the next image to be the current image when the detected flicker number is determined to be not larger than the flicker number threshold to repeat the above steps.

3 more elements

Dependencies are inferred from the claim text.