Human observer can understand the contents of image and can do object based enhancement manually based on their perceptual understanding. Existing photo applications use low level description for performing similar tasks. However, there is gap between the output of operations by application and same task performed by human being. To bridge this gap, objects must be identified by photo applications before enhancement. This is achieved by breaking the image into significant segments and finding important perceptual objects. In this paper we describe different methods for detecting and tagging specific objects such as sky, skin and foliage in image

1. R. Bergman, H. Nachlieli "Perceptual Segmentation: Combining Image Segmentation With Object Tagging" IEEE Trans. on Image Processing, Vol. 20, No. 6, June 2011
2. G. P. Balasubramanian, E. Saber, V. Misic, E. Peskin, and M. Shaw, "Unsupervised color image segmentation using a dynamic color gradient thresholding algorithm," in Proc. SPIE/IS&T: Electron. Imag. Symp. , B. E. Rogowitz and T. N. Pappas, Eds. , Vol. 6806,Jan. 2008
3. L. Garcia, E. Saber, V. Amuso, M. Shaw, and R. Bhaskar, "Automatic image segmentation by dynamic region growth and multiresolution merging," in Proc. IEEE Int. Conf. Acoust. , Speech Signal Process. , pp. 961–964, Mar. 2008.
4. J. Luo and S. P. Etz, "A physical model-based approach to detecting sky in photographic images," IEEE Trans. Image Process. , Vol. 11, No. 3, pp. 201–212, Mar. 2002
5. E. Saber, A. M. Tekalp, R. Eschbach, and K. Knox, "Automatic image annotation using adaptive color classification," Graph. Models Image Process. , Vol. 58, pp. 115–126, Mar. 1996.
6. M. J. Jones and J. M. Rehg, "Statistical color models with application to skin detection," in Proc. IEEE Conf. Comput. Vis. Pattern Recognit. , Vol. 1, pp. 274–280, 1999.
7. T. Sawangsri, V. Patanavijit, and S. Jitapunkul, "Face segmentation based on hue-cr components and morphological technique," in Proc. IEEE Int. Symp. Circuits Syst. , Vol. 6, pp. 5401–5404 May 2005.
8. A. Vailaya and A. Jain, "Detecting sky and vegetation in outdoor images," in Proc. IS&E/SPIE Conf. Storage Retrieval Media Databases, pp. 411–420, Jan. 2000.
9. A. Vailaya and A. Jain, "Detecting sky and vegetation in outdoor images," in Proc. IS&E/SPIE Conf. Storage Retrieval Media Databases, pp. 411–420, Jan. 2000.

Image Segmentation Perceptual Tagging Sky Detection Skin Detection Foliage Detection