We assume the retailers strive for the maximization of profits, and this paper talks about three kinds of package coupon, and focus on the optimal decision of coupons face value and product prices for each kind of them on the two strategies which is differential pricing and uniform pricing. We get a result that the profit of using coupon offer is higher than without-a-coupon offer, and the retailers who choose differential pricing will get more profits, besides we achieve the different joint pricing decisions of differential pricing for each kind of coupon. At the end of this paper, we compare the three coupons integrated, and find out the best offering mode and the best pricing decision corresponding.

Moving shadow detection is critical for video surveillance system since shadow points are often misclassified as object points,which causes errors in segmentation and tracking.The conventional algorithms always need the scene characteristics,which makes the algorithms not widely used and automatically performed.An approach is presented that does not rely on any scene assumptions such as camera location and scene characteristics.Color information,texture information and spatial constraints are embedded to define the overall algorithm.Firstly,relevant areas are identified in each image.Then,the color distortion caused by shadow are calculated. Finally,the moving object and shadow are detected by using color distortion compensation and texture verification.The proposed algorithm is demonstrated on many kinds of outdoor video sequences.Moreover,the performance comparisons show that the proposed algorithm outperforms the conventional ones.