公开(公告)号：US5446804A

公开(公告)日：1995-08-29

申请号：US227764

申请日：1994-04-14

申请人： Jan P. Allebach ,  Ping W. Wong

发明人： Jan P. Allebach ,  Ping W. Wong

IPC分类号： H04N1/393 ,  G06T3/40 ,  G06T5/00 ,  G09G5/36 ,  G06K9/42

CPC分类号： G06T7/0083 ,  G06T3/4023 ,  G06T3/403

摘要： A method of magnifying a digital image based on an edge map. The image has many original pixels, with each pixel having a level, and the locations of the pixels having a resolution. The method to magnify the image includes the steps of producing an edge map with many boundaries from the digital image, projecting the edge map onto the digital image, generating one or more additional pixels in locations among the original pixels by manipulating the levels of one or more original pixels without crossing any boundaries set by the edge map, and expanding the distances between the pixels so that the resolution of the locations of the pixels becomes the same as the original pixels. In another preferred embodiment, the original digital image is enlarged to the size of the magnified image by extending proportionally the locations of the original pixels. Then the edge map is produced and projected onto the enlarged image to generate additional pixels. After the step of generating, the resolution of the locations of the pixels becomes the same as the original pixels.

摘要翻译： 一种基于边缘图放大数字图像的方法。 图像具有许多原始像素，每个像素具有一个电平，并且像素的位置具有分辨率。 用于放大图像的方法包括以下步骤：从数字图像产生具有许多边界的边缘图，将边缘图投影到数字图像上，通过操纵一个或多个图像的水平在原始像素之间的位置中生成一个或多个附加像素 更多的原始像素，而不会跨越由边缘图设置的任何边界，并且扩展像素之间的距离，使得像素的位置的分辨率变得与原始像素相同。 在另一个优选实施例中，通过成比例地延伸原始像素的位置，将原始数字图像放大到放大图像的尺寸。 然后生成边缘图并将其投影到放大的图像上以产生附加的像素。 在生成步骤之后，像素的位置的分辨率变得与原始像素相同。

公开(公告)号：US5506699A

公开(公告)日：1996-04-09

申请号：US53643

申请日：1993-04-27

申请人： Ping W. Wong

发明人： Ping W. Wong

IPC分类号： G06T5/00 ,  H04N1/40 ,  G06K9/40

CPC分类号： H04N1/40075

摘要： A method and apparatus for converting a binary image into a gray scale image includes a pipeline having a number of nearly identical stages. At each stage, modifications occur to provide the gray scale image by following a sequence of steps including: (1) determining a sample mean value representing an averaging of pixel values within a neighborhood containing a selected pixel; (2) determining a weighted variation value representing pixel value variations within the neighborhood; and (3) adjusting the pixel value of the selected pixel toward the sample mean value if the difference between the pixel value and the sample mean value exceeds the weighted variation value. The adjustment to the pixel value is in the direction of the sample mean value. Preferably, the weighting of the variation value is different at each stage. At each stage along the pipeline, low pass filtering is provided to remove high frequency noise generated by the process.

摘要翻译： 用于将二进制图像转换为灰度图像的方法和装置包括具有几个几乎相同阶段的流水线。 在每个阶段，通过遵循一系列步骤来提供灰度图像以进行修改，所述步骤包括：（1）确定表示包含所选像素的邻域内的像素值的平均的采样平均值; （2）确定表示所述邻域内的像素值变化的加权变化值; 以及（3）如果像素值和样本平均值之间的差超过加权变化值，则将所选像素的像素值调整为采样平均值。 对像素值的调整在样本平均值的方向上。 优选地，变化值的加权在每个阶段是不同的。 在沿着管道的每个阶段，提供低通滤波以去除由该过程产生的高频噪声。