In a CMOS image sensor in which a plurality of pixels is arranged in a matrix, a transistor in which a channel formation region includes an oxide semiconductor is used for each of a charge accumulation control transistor and a reset transistor which are in a pixel portion. An adjacent pixel prediction unit 83 performs an intra prediction with respect to an object block by using a difference between the object adjacent pixel and a reference adjacent pixel, generates a prediction image by a residual signal, and outputs the prediction image to a secondary residual generating unit 82. The drive signal generator is configured to generate drive signals for driving the ejection drive elements to form one of the N types of dots in each pixel area in response to a print signal including two types of mask selection data for selecting one type of masking signal from a plurality of type of masking signals corresponding to the N types of dots. The gases are distributed in the monolith in such a way that at least one of the channel walls is a shared or joint wall for both gases. Thus, a mapping is performed and different processing capabilities are used on different portions of the data connection. Each leg would have an incorporated adjustable leg that could be set at a varying height, with each adjustable leg having a non-skid pad on the bottom to minimize the risk that the ladder would slip when in use.