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this might be a bit confusing among different opencv versions, but as of

• versions before 3.0 would write a freeman chain into the image
• between 3.0 and 3.4.3, the image would be left unchanged (the original input)
• current 3.4 / master version does no more return the image at all (only contours, hierarchy)

this might be a bit confusing among different opencv versions, but as of

• versions before 3.0 would write a freeman chain into the imageimage, and return that
• between 3.0 and 3.4.3, the image would be left unchanged (the original input)
• current 3.4 / master version does no more return the image at all (only contours, hierarchy)

this might be a bit confusing among different opencv versions, but as of

• versions before 3.0 would write a freeman chain chain into the image, and return that
• between 3.0 and 3.4.3, the image would be left unchanged (the original input)
• current master version does no more return the image at all (only contours, hierarchy)