Abstract Local tri-directional pattern (LtriDP) is a method of extracting local intensity features from each pixel based on direction. However. this method has not been able to provide good performance in extracting features for image retrieval. One reason that makes image retrieval performance worse is the effect of lighting. https://www.roneverhart.com/Vive-Health-Dorsal-Night-Splint-Alleviates-Plantar-Fasciitis-Pain/