When the image data having a predetermined gradation value for each pixel is input, and the image data is searched from the initial pixel and the total of the gradation values of the pixels, including the searched pixels, becomes a predetermined threshold value or more, a dot is generated at the center of the gravity position as a quantized pixel group. This ensures that even in a compact transmissionreception unit, the electrical length is equivalent to 4 and the antenna gain is improved; therefore, a transmissionreception unit with a satisfactory transmissionreception sensitivity can be realized. A laser projector and frame assembly is also disclosed, wherein the metrology receivers are located on the frame and the frame includes laser targets for correcting laser drift. The rope seal serves to seal a leakage path that may exist over the bucket hooks between the buckets and respective rotor grooves. The selection logic selectively selects pixels to be read from the first frame buffer and the second frame buffer into the first register and the second register. A special control circuit is added to each pixel in the display in order to generate a decaying e-function as a boosting voltage for an accelerated transition into the desired grey scale.