Using bincodes to represent binary images is shown to be very simple and storage-saving. Given a set of bincodes, this rithms on these spatial data structures have been developed.
paper presents two improved codes, namely, the logicodes and
Bincode is a new method to compress binary images the restricted logicodes to represent binary images. We first [15]. Each bincode represents a black rectangular subimage transform the given bincodes into a set of logical expressions. of the input image; the code is formed by interleaving the Then a minimization technique is employed to reduce the storbinary representations of the x-and y-coordinates of the age space required for these logical expressions, thus obtaining subimage with its level in the corresponding bintree. It has the logicodes, on which set operations can be applied directly.
0 to 25% space utilization improvement over the linear Further, we put some restrictions into these logicodes to make quadtree coding method in empirical comparisons [22].
resulting logicode, called the restricted logicode, represent-Some fact image algorithms on bincodes [9, 10, 3] have ing a connected black block. Given 20 different-type real imalso been developed. In [19], the input is a rectangular ages, experimental results show that our logicodes (restricted binary 2 m ฯซ 2 n image array and each pixel is labelled with logicodes) present a saving of 29% to 44% (12% to 34%) with respect to bincodes. When compared to Sarkar's method, except an m-and an n-bit Gray code. Then, each pixel position spending a little more space, our proposed codes do have three of the binary image is represented by a logical expression advantages: (1) it is easier to extract the related geometrical of m ฯฉ n variables. Sarkar applies the Quine-McCluskey coordinates; (2) the bincodes can be used as direct input; i.e., method to minimize the Boolean function resulting from they do compress the bincodes further; and (3) each restricted the encoding of the original binary image. Experimental logicode represents a connected block block.