Noise Resilient Local Gradient Orientation for Content-Based Image Retrieval

Table 2

Average retrieval precision and average retrieval recall of NRLGO at varying values of gradient orientation and color quantization levels by keeping local contrast information fixed at 10 on Corel 5k in HSV.

Color quantization	Texture classification (Corel 5k, contrast information = 10)
	Precision (%)						Recall (%)
	6	12	18	24	30	36	6	12	18	24	30	36
192	64.05	64.26	63.94	64.01	63.47	63.35	7.68	7.71	7.67	7.68	7.61	7.60
128	65.32	64.38	65.04	65.05	64.62	64.56	7.89	7.72	7.80	7.80	7.75	7.74
108	64.71	64.15	63.68	65.07	63.68	63.63	7.76	7.69	7.64	7.80	7.64	7.63
72	64.87	65.30	64.67	65.40	64.35	65.37	7.78	7.83	7.76	7.85	7.72	7.84