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Re-sizing a perspective transformation

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Hello forum, I have a Homography Matrix that was computed from 2 static videos ( Video A and Top View ) both with a resolution of 1920 x 1080. I would like to increase the speed so I have resized Video A to 960 x 540 before applying the Homography Matrix. Then I resize the image by x2 and use the addWeighted function with Top View. The problem is, I am not getting any output from Video A ie. the final result is just the Top View. I hope I can get some help on this.

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