FIELD: television. SUBSTANCE: device has facility finding image detection regions and detection facility for determining video signal level corresponding to each image detection region. Facility finding image detection regions is made for finding image detection regions so as to ensure that mentioned image detection regions cover entire screen of television set. Image-finding facility is introduced in device to find out if there is any image on each of mentioned image detection regions using data coming from mentioned detection facility which is made for detecting mentioned level relative to black level and to bright level of video signal luminance component. EFFECT: enhanced precision of identifying any image on screen of television set. 7 cl, 10 dwg
