公开(公告)号：WO1991002426A2

公开(公告)日：1991-02-21

申请号：PCT/US1990004185

申请日：1990-07-20

Applicant: INTERGRAPH CORPORATION

Inventor： INTERGRAPH CORPORATION ,  KIDD, Robert, C. ,  LEFEBVRE, J., Brett

IPC: H04N01/40

CPC classification number: H04N1/4058

Abstract: A method for reproducing images using rotated screens, wherein the rotated screens are formed by the replication of a screen tile (ABCD). The screen tile (ABCD) is based on a seed screen cell (11, 17) that is disposed at the desired angle of screen rotation, theta, and is replicated so as to fill the screen tile. Thus, the screen can be generated by replicating the screen tile with respect to the same coordinate system as that identifying addresses for the image data being screened, i.e., without rotating the screen tile. Both the screen tile and the seed screen cell (11, 17) are represented by matrices. Noise (51) can be introduced into process of forming the screen in order to further lessen Moire patterns.

Abstract translation: 一种使用旋转屏幕再现图像的方法，其中旋转屏幕通过屏幕瓦片（ABCD）的复制形成。 屏幕瓦片（ABCD）基于以屏幕旋转θ所需的角度设置的种子屏幕单元（11,17），并且被复制以填充屏幕瓦片。 因此，可以通过相对于与被屏蔽的图像数据的识别地址相同的坐标系复制屏幕图块，即不旋转屏幕图块来生成屏幕。 屏幕瓦片和种子屏幕单元（11,17）都由矩阵表示。 可以将噪声（51）引入到形成屏幕的过程中，以进一步减少莫尔图案。

公开(公告)号：WO1990011576A1

公开(公告)日：1990-10-04

申请号：PCT/US1990001456

申请日：1990-03-16

Applicant: INTERGRAPH CORPORATION

Inventor： INTERGRAPH CORPORATION ,  PINARD, Alward, I. ,  GIRZON, Gary ,  WARNER, Andrew

IPC: H04N01/036

CPC classification number: G06K15/1271 ,  G06K15/1214 ,  G06K15/1295 ,  H04N1/036

Abstract: Drum scanning system to increase the processing speed for scanning/plotting. At each point of the beam travel path, the light beam (18) is rapidly deflected at a predetermined series of angles by an Acousto-optical modulator AOM (10) so that multiple pixels (p1-pn) are struck at the target (26). The duty cycle is increased and orthogonality distortions eliminated.

Abstract translation: 鼓式扫描系统可提高扫描/绘图的处理速度。 在光束行进路径的每个点处，光束（18）通过声光调制器AOM（10）以预定的一系列角度被快速偏转，使得在目标（26）处撞击多个像素（p1-pn） ）。 增加占空比并消除正交失真。