How to detect scaled ID card rectangle

asked 2015-02-21 08:24:41 -0600

essamzaky
583 ●2 ●5 ●18

I have application which will read the ID crad , the nature of the image is that the card is scaled and shifted location now how I get the card rectangle and scale it to the fixed defined rectangle , a sample of card images attached

the input image is scaled by 130%

image description

The required image , the card rectangle and scaled to the original size image description

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answered 2015-02-21 09:22:29 -0600

theodore

4133 ●12 ●41 ●101

updated 2015-02-21 09:24:11 -0600

My process would be:

find external contour
obtain bounding box of the contour --> rectangle
pass rectangle/ROI to another Mat
resize new Mat to desired size/dimensions

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And to add to this a bounding rectangle of a contour will be a rotated rect, so you could first rotate it back to the best orientation before resizing.