Motion detection techniques for improved image remoting

A system for conserving resources in a remote presentation session, where a client possesses a first image, comprising:

• a processor;
• a memory communicatively coupled to the processor, the memory bearing computer-executable instructions, that when executed on the processor cause the processor to perform operations comprising:
• determining a rolling 2D hash for at least one pixel of a second image;
• determining a matching hash window between the second image and the first image based on the rolling 2D hash for at least one pixel of the second image and a rolling 2D hash for at least one pixel of the first image, the matching hash window having a location in the second image and a location in the first image;
• and
• sending the client an instruction to transfer the matching rectangle from the location in the first image to the location in the second image, such that the client displays the second image without being sent the matching rectangle for the second image.

A computer-readable storage medium bearing computer-readable instructions, that when executed on a computer, cause the computer to perform operations comprising:

• determining a rolling 2D hash for at least one pixel of a first image;
• determining a pivot point of the first image based on the rolling 2D hash of at least one pixel of the first image based on determining that the output of the function operated upon the rolling 2D hash of a pixel matches a pre-determined value;
• sending an indication of the first image to a client via a remote presentation session, such that the client displays the first image on a display device;
• determining a second rolling 2D hash for at least one pixel of a second image;
• determining a pivot point of the second image based on the rolling 2D hash of at least one pixel of the second image;
• determining a matching hash window between the second image and the first image based on determining that a rolling 2D hash of a pixel corresponding to the pivot point of the second image matches a rolling 2D hash of a pixel corresponding to the pivot point of the first image, the matching hash window representing graphical portion of the second image and the first image, the matching hash window having a location in the second image and a location in the first image;
• removing a tile of a dirty tile list of the second image, the tile being encompassed by the matching rectangle, the dirty tile list representing a list of tiles that differ between the first image and the second image;
• sending the client an indication to transfer the matching rectangle from the location in the first image to the location in the second image, such that the client transfers the matching rectangle from the location in the first image to the location in the second image before the client replaces a dirty tile with a new tile;
• and
• sending the client the dirty tile list, such that the client displays the second image without being sent the matching rectangle for the second image.