Method, electronic apparatus and storage medium for detecting a static logo of a video

A method for detecting a static logo of a video, comprising:

• calculating an absolute value of a difference value between a pixel grayscale value of each pixel position in a current video frame and a pixel grayscale value of a corresponding pixel position in an immediately preceding video frame, and obtaining a pixel grayscale flag value of the each pixel position according to the absolute value;
• calculating a grayscale gradient between a pixel at each pixel position in the current video frame and a pixel in a preset neighborhood of the pixel, and obtaining an edge gradient flag value of each pixel position according to the grayscale gradient;
• determining a pixel position having an edge according to the grayscale gradient, and determining an edge direction of a pixel at the pixel position having the edge according to the grayscale gradient of the pixel at the pixel position having the edge;
• calculating, in the preset neighborhood centered on the pixel at the pixel position having the edge in the current video frame, a local direction correlation coefficient between the edge direction of the pixel at the pixel position having the edge in the current video frame and an edge direction of a pixel at the corresponding pixel position of the immediately preceding video frame, and determining an edge direction flag value of the pixel at the pixel position having the edge according to the local direction correlation coefficient;
• calculating, in a preset neighborhood centered on the pixel at each pixel position in the current video frame, a first local confidence degree of the pixel grayscale flag value, a second local confidence degree of the edge gradient flag value, and a third local confidence degree of the edge direction flag value respectively;
• calculating a first contribution score of the first local confidence degree, a second contribution score of the second local confidence degree and a third contribution score of the third local confidence degree respectively, and calculating a total contribution score of the first contribution score, the second contribution score and the third contribution score;
• and
• gathering the total contribution score of each pixel position of the current video frame, and determining a static logo in the current video frame according to the total contribution score of each pixel position.