Open the mobile phone WeChat, click Discover, click the magnifying glass icon on the upper right, enter the travel code on it, and there will be a communication travel card service below. Click Enter to enter your mobile phone number, click Get Verification Code, enter the verification code, check Agree and authorize the operator to query the information of the places I have been during the 14 epidemic, and click Query to get the travel itinerary code.

Then take a screenshot of travel itinerary code according to the method of your mobile phone screenshot, and then send the screenshot to the owner in the print shop for him to print.

Run-length coding (RLE), also known as run-length coding, run-length coding and variable-length coding, is a statistical coding. The main technique is to detect repeated bit or character sequences and replace them with their frequency.

It is more suitable for binary image coding, but not for continuous tone image compression, such as photos in daily life. In order to achieve better compression effect, sometimes run-length coding is mixed with other coding methods.