تخمين صور البث التلفزيوني الفضائي لثلاثة اقمار بالاعتماد علي الكشف الحافي

This analysis study dealt with studying TV images for asatellite channel transmitted on three satellite (Arab Sat,Nile Sat, and Hot Bird) to find best reliable threshold to getthe best edges as well as studying contrast for those imagesin threshold areas where sobel operation was used todesignate the threshold which identified the best satellitebroadcasting image drawing contrast value as a function forthreshold of edge detection . An analysis study was madefor that image depending statistical features throughcalculating intensity distribution of the color component(RGB) and light compound (L) for the areas.Upon studying and calculating TV images statisticalfeatures, it was noticed that the peaks of histograms havedecreased upon increasing the threshold of the edges areassince most weak threshold in the captured images are in thelight area (high intensity). Thus, when increasing thethreshold; the amount of the edges decreased as well as thegeneral mean for the edges element. When studyingdetection of the image edges, it was found that the bestthreshold is TH=30 which gave the highest contrast (Ct) inall three satellites. The satellites broadcasting for AL-Hurachannel was the best on Hot Bird then Nile Sat then ArabSat.