Patent ID: 7646929
Filing Date: 2010-01-12
Classification: G06F,H04N

Abstract:
1. A signal-transmitting system comprising: a data-transmitting apparatus that comprises: temporary memory means for temporarily storing image data representing a frame preceding an input image data; comparing means for comparing the input image data with the image data stored in the temporary memory means and representing the preceding frame, for calculating a difference between each pixel data of the input image data and a corresponding pixel data of the image data stored in the temporary memory means, and for calculating a value that is a sum of the calculated differences; differential image data generating means for setting a region of the input image data, which is to be transmitted, in accordance with the difference calculated by the comparing means, and for generating differential image data for the region which includes data representative of the region; coarse-image data generating means for generating coarse image data from the input image data; transmitting means for transmitting the differential image data or the coarse image data to an external apparatus; and transmission image data controlling means for performing a control so that the differential image data is transmitted to the external apparatus when the value calculated by the comparing means is smaller than a prescribed value, and that the coarse image data is first transmitted and original input image data is then transmitted to the external apparatus when the value calculated by the comparing means is equal to or larger than the prescribed value; and a data-receiving apparatus that is connected to the data-transmitting apparatus by a network and comprises: receiving means for receiving data transmitted from the data-transmitting apparatus; differential image data reproducing means for generating reproduction image data in accordance with differential image data received by the receiving means; coarse-image data reproducing means for reproducing coarse image data received by the receiving means; image data reproducing means for reproducing the original image data received by the receiving means; and reproduced-data switching control means for switching the reproducing means in accordance with the image data received.