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公开(公告)号：US6101282A
公开(公告)日：2000-08-08
申请号：US665953
申请日：1996-06-19
摘要： An image processing apparatus entropy encodes plural encoding target data by using a first entropy encoding table to provide respective data amounts of plural encoded data and compares the data amounts of plural encoded data with each other. One of the plural encoding target data is selected according to the result of the comparison and a second entropy encoding table is produced according to the content of the selected encoding target data. The apparatus then entropy encodes the selected encoding target data utilizing the second entropy encoding table.
摘要翻译： 图像处理装置通过使用第一熵编码表熵编码多个编码对象数据，以提供多个编码数据的相应数据量，并将多个编码数据的数据量彼此进行比较。 根据比较结果选择多个编码对象数据之一，根据所选择的编码对象数据的内容生成第二熵编码表。 然后，该装置利用第二熵编码表熵编码所选择的编码目标数据。
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52.发明授权
公开(公告)号：US6031938A
公开(公告)日：2000-02-29
申请号：US635521
申请日：1996-04-22
申请人： Hiroshi Kajiwara
发明人： Hiroshi Kajiwara
摘要： A pixel which is one pixel prior to a pixel to be coded x in image data is defined as a specific pixel a, and differences (b-a) and (c-a) between each of pixel data of neighboring pixels b and c and pixel data of the specific pixel a are calculated. The differences (b-a) and (c-a) are compared to a predetermined value Th1, and if both of the differences (b-a) and (c-a) are less than the predetermined value Th1, a difference (x-a) between pixel data of the pixel to be coded and the pixel data of the specific pixel is encoded by Markov model coding on the basis of the difference (x-a) and the differences (b-a) and (c-a). Whereas, if at least one of the differences (b-a) and (c-a) is not less than the predetermined value Th1, then the pixel to be coded is encoded by predictive coding on the basis of an average of the pixel data of the specific pixel a and the neighboring pixel b, {(a+b)/2} and an error of the average with respect to the actual pixel data of the pixel to be coded x.
摘要翻译： 将图像数据中要被编码的像素x之前的一个像素的像素定义为特定像素a，并且将相邻像素b和c的像素数据的每个像素数据和像素数据之间的差（ba）和（ca） 计算特定像素a。 将差（ba）和（ca）与预定值Th1进行比较，并且如果差（ba）和（ca）都小于预定值Th1，则像素的像素数据之间的差（xa） 基于差（xa）和差（ba）和（ca），通过马尔可夫模型编码对特定像素的像素数据进行编码。 而如果差异（ba）和（ca）中的至少一个不小于预定值Th1，则将根据特定像素的像素数据的平均值进行预测编码来编码要编码的像素 a和相邻像素b，{（a + b）/ 2}和相对于要编码的像素x的实际像素数据的平均值的误差。
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公开(公告)号：US6028963A
公开(公告)日：2000-02-22
申请号：US874581
申请日：1997-06-13
申请人： Hiroshi Kajiwara
发明人： Hiroshi Kajiwara
CPC分类号： H04N19/91 , H04N19/593 , H04N19/60
摘要： There is provided an image encode apparatus which comprises a generation means for generating a prediction error from an encode target pixel value and a prediction value of the encode target pixel value, a judgment means for generating a generation frequency distribution of the prediction error to judge whether or not the generation frequency distribution is discrete and an entropy encode means for changing encode data corresponding to the prediction error and performing entropy encoding on the obtained encode data, in accordance with a judged result by the judgment means. Therefore, the encoding can be effectively performed even on such the image data having the discrete pixel value as in a CG image, a limited-color image or the like.
摘要翻译： 提供了一种图像编码装置，其包括：生成装置，用于从编码目标像素值和编码目标像素值的预测值产生预测误差;判断装置，用于生成预测误差的生成频率分布，以判断是否 或者不是生成频率分布是离散的，熵编码装置根据判断装置的判断结果，改变对应于预测误差的编码数据，并对获得的编码数据进行熵编码。 因此，即使在像CG图像，有限彩色图像等具有离散像素值的图像数据上也可以有效地执行编码。
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