CN102148993B - Method and device for encoding wavelet image - Google Patents

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CN102148993B
CN102148993B CN 201010116325 CN201010116325A CN102148993B CN 102148993 B CN102148993 B CN 102148993B CN 201010116325 CN201010116325 CN 201010116325 CN 201010116325 A CN201010116325 A CN 201010116325A CN 102148993 B CN102148993 B CN 102148993B
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[0076] Sn(i, j)是n的函数，Sn(i，j)=l时，表明此时Sn(i，j)对应的小波系数为重要系数； sn(i, j)=0时，表明此时Sn(i，j)对应的小波系数为不重要系数。 [0076] Sn (i, j) is a function of n when Sn (i, j) = l, indicating that it is Sn (i, j) corresponding to the significant coefficients of wavelet coefficients; sn (i, j) = 0 when , indicating that Sn (i, j) corresponding insignificant coefficient wavelet coefficients. [0077] 具体分类过程为：[0078] I)从金字塔顶端开始，即第I级金字塔开始，对其小波系数进行重要性判断；[0079] 2)如果Sn(i, j)的值为0，则将对应的C1 (i, j)留在LIN[1]中；[0080] 3)如果Sn(i，j)的值为1，[0081] 如果1>0时，LIN[1]中对应的小波系数为C1 (i, j)-2n ；[0082] 如果1=0时，将对应的小波系数C0(i，j)加入到第一像素列表中，且LIN[1]中对应的小波系数为C1Q, j)-2n ；[0083] 4)如果当前级的金字塔中的小波系数全部分类结束，则令I = 1-1，即进入第1-1 级金字塔，重复上述2)步，直至1=0。 [0077] The classification process is specifically: [0078] I) starting from the top of the pyramid, the pyramid begins i.e. Class I, determines its importance wavelet coefficients; [0079] 2) If Sn (i, j) is 0 , then the corresponding C1 (i, j) remain in the LIN [1]; and [0080] 3) If Sn (i, j) is 1, [0081] If 1> 0, LIN [1] in wavelet coefficients corresponding to C1 (i, j) -2n; [0082] If 1 = 0, the corresponding wavelet coefficients C0 (i, j) is added to the list of the first pixel, the LIN and [1] corresponding the wavelet C1Q, j) -2n; [0083] 4) If the current level of the pyramid of wavelet coefficients in the classification of all the end, then let I = 1-1, i.e. into the first pyramid level 1-1, repeating the above step 2) until 1 = 0. [0084] 5)最终得到当前子带在比特平面系数为η时的第一像素列表。 [0084] 5) finally obtained a first list when the current pixel in the sub-band bit-plane coefficient η. [0085] 步骤304 :对分类得到的第一像素列表中的小波系数执行细化操作；[0086] 具体为：输出当前比特平面系数为η时的第一像素列表中每个小波系数的第η个MSB，然后清空第一像素列表，使之为空集。 [0085] Step 304: performing a thinning operation on the first pixel wavelet coefficients obtained in the sorted list; [0086] specifically to: output a first coefficient of the current bit-plane pixel η list when the first wavelet coefficients of each η a the MSB, then empty the list of the first pixel, so that the empty set. 所述各系数的第η个MSB的输出过程为现有技术，此处不再详述。 The output of each coefficient η MSB of the process of the prior art, not described in detail here. [0087] 本发明中，从比特平面系数《=^logr^w)l)j开始，执行分类和细化过程，直到η=0 为止结束。 [0087] In the present invention, the bit-plane from the coefficient "= ^ logr ^ w) l) j starts, performing classification and refinement process until η = 0 until the end. [0088] 步骤305 :判断当前比特平面系数η与I的大小关系，如果η大于等于1，则令η=η-1，并返回步骤303 ;如果η小于I，则执行步骤306 ；[0089] 该步骤即为对比特平面系数η执行量化操作。 [0088] Step 305: judging whether the current bit-plane coefficient [eta] magnitude relationship I, if [eta] is greater than or equal to 1, then let η = η-1, and returns to step 303; if [eta] is less than I, execute step 306; [0089] this step is the performed on the bit-plane quantization coefficients η operation. [0090] 其中，所述η大于等于I时，表明对当前子带的编码过程还未结束；所述η小于I 时，表明对当前子带的编码过程已结束，因为对各子带的编码过程是从η取最大值开始到η 为O结束的。 When [0090] wherein greater than or equal η I, indicate that the current sub-band coding process has not been completed; η is less than said I, to indicate the current sub-band coding process is completed, because each sub-band coding process from the start to the maximum value η η is O end. [0091] 步骤306 :当前子带的小波系数完全编码过程结束。 [0091] Step 306: the complete coding wavelet coefficients during the current sub-band end. [0092] 这里，当前子带完全编码过程结束后，还需对最终输出的码流执行常规的二进制算术熵编码，以便进一步提高压缩效率。 [0092] Here, the current sub-band coding process ends completely, the stream needs to perform a conventional binary arithmetic entropy encoding the output of the final code, in order to further improve the compression efficiency. [0093] 为实现上述方法，本发明还提供了一种小波图像编码的装置，如图5所示，该装置包括：编码模块和截断模块；其中，[0094] 所述编码模块，用于利用金字塔结构对经小波分解所得的各子带对应的小波系数进行分类，再对已分类的小波系数执行对应的编码操作，得到各子带的压缩码流，并将所得的各子带的压缩码流传输给截断模块；[0095] 所述截断模块，用于根据编码模块所发的各子带压缩码流的率失真特性，将目标码率在各子带的压缩码流间进行最优分配，并依据各子带被分配的码率对各子带的码流进行截断，得到对小波图像进行编码的码流。 [0093] To achieve the above-described method, the present invention also provides an apparatus for wavelet image coding, as shown in FIG. 5, the apparatus comprising: an encoding module and a truncation module; wherein [0094] the encoding module, for use pyramid wavelet coefficients for each sub-band wavelet decomposition obtained by the corresponding classification, and then performs an encoding operation corresponding to the wavelet coefficients classified, to give each subband compressed stream, each sub-band and the resulting compressed codes stream to truncation module; [0095] the truncation module is configured with a compression rate of each stream according to the encoding module issued by the sub-distortion characteristics, and in each sub-band of the compressed stream between the target code rate assignment optimally , and truncating the code stream according to the respective sub-band is allocated for each sub-band rate to obtain the encoded bit stream wavelet image. [0096] 所述编码模块利用金字塔结构对经小波分解所得的各子带对应的小波系数进行分类，再对已分类的小波系数执行对应的编码操作，具体为：[0097] 编码模块先为当前子带构建对应的金字塔结构，并为当前子带设置第一像素列表和第二节点列表，初始化设置第一像素列表和第二节点列表中的内容及比特平面系数η的初始值大小；对所构建金字塔结构中的所有小波系数进行分类，并对分类得到的第一像素列表中的小波系数执行细化操作；[0098] 还用于判断当前比特平面系数η与I的大小关系,确定η大于等于I时,令η=η_1, 并从所述执行分类操作步骤开始继续执行后续的编码过程；确定η小于I时，结束当前子带的小波系数完全编码过程。 Wavelet coefficient [0096] The encoding module by using a pyramid of wavelet decomposition of each sub-band obtained corresponding to the classification, then performing the operation corresponding to the encoding of wavelet coefficients classified, in particular: [0097] The first encoding module for the current the initial value of the size corresponding subband pyramid structure constructed and arranged for the current sub-band of the first list and the second pixel point list, a list of initial setting of the first pixel and the second node in the list and contents of the bit-plane coefficient η; of their construction of all the wavelet coefficients in pyramid classification, and performs pixel thinning operations first wavelet coefficients obtained in the sorted list; [0098] further configured to determine the current bit-plane coefficient η I and the magnitude relation, determined greater than η It is equal to I, so that η = η_1, and resumes execution from the subsequent encoding process step of performing classification operation; determining [eta] is less than I, completely ending the encoding process the wavelet coefficients of the current sub-band. [0099] 所述编码模块进一步包括：金字塔构建模块、初始化模块、分类模块、细化模块和量化模块；其中，[0100] 所述金字塔构建模块，用于为当前编码的子带构建对应的金字塔结构，并将构建结果发送到初始化模块；[0101] 所述初始化模块，用于为当前子带设置第一像素列表和第二节点列表，并初始化设置第二节点列表和第一像素列表中的内容及比特平面系数η的初始值大小，并将设置的结果发送到分类模块；[0102] 所述分类模块，用于以初始化模块所发的初始值为依据对当前子带对应的金字塔结构中的所有小波系数进行分类，并将分类结果发送到细化模块；还用于收到量化模块所发的当前比特平面系数η后，以新的η为依据继续执行分类操作；[0103] 所述细化模块，用于对分类模块分类得到的第一像素列表中的小波系数执行细化操作，并在执行完当前 [0099] The encoding module further comprising: pyramid construction module, initialization module, a classification module, refinement module and a quantization module; wherein [0100] the pyramid construction module, for encoding the pyramid for the current sub-band corresponding to construct structure, and the results are sent to build the initialization module; [0101] the initialization module is configured with a first pixel and the second node list for the current sub-list, and initializes the list of the second node and the first set of pixels in the list content bit-planes and the initial value of the size coefficient η, and transmits the set to the result of the classification module; [0102] the classification module is configured to initialize the module to send an initial value based on the current sub-band corresponding to the pyramid structure of classify all wavelet coefficients, and sends the result to the classification refinement module; after receiving the quantization module is further configured to send the current bit-plane coefficient [eta], [eta] is based on a new classification operation to continue; [0103] the refinement module, for performing a thinning operation of the first wavelet coefficients pixel classification module list obtained in the classification, and executing the current 化操作后触发量化模块；还用于收到量化模块的通知后将当前子带的所有小波系数的细化结果发送到截断模块；[0104] 所述量化模块，用于判断分类模块中当前比特平面系数η与I的大小关系，如果η 大于等于1，则η减1，将递减后的η发送到分类模块，并触发分类模块以新的η为依据继续执行分类操作； [0105] 所述量化模块，还用于确定分类模块中当前比特平面系数η小于I时，通知细化模块将当前子带的所有小波系数的细化结果发送到截断模块。 After the operation trigger quantization module; further refinement for the results of all the wavelet coefficients after quantization module notified of the current sub-band to cut off transmission module; [0104] The quantization module configured to determine the current bit classification module plane coefficient η I and the magnitude relation, if η is greater than or equal to 1, the minus η 1, η transmitting the decremented to the classification module, and a classification module triggers a new η classification based continue operation; [0105] the the quantization module is further configured to determine the classification module the current bit-plane coefficient η is smaller than I, the notification will be sent refinement module to refine the results of all the wavelet coefficients to cutoff the current sub-band module. [0106] 以上所述，仅为本发明的较佳实施例而已，并非用于限定本发明的保护范围，凡在本发明的精神和原则之内所作的任何修改、等同替换和改进等，均应包含在本发明的保护范围之内。 [0106] The above are only preferred embodiments of the present invention but are not intended to limit the scope of the present invention, any modifications within the spirit and principle of the present invention, equivalent replacements and improvements are It is included within the scope of the present invention.

Claims (6)

1. 1. 一种小波图像的编码方法，其特性在于，该方法包括：对各子带的小波系数进行L级金字塔结构构建，所述L为整数，L的最大值为max {log：, log；7}，其中，所述W和H分别为当前子带的宽度和高度；为当前子带设置重要像素列表LSP和不重要节点列表LIN，并初始化设置重要像素列表LSP和不重要节点列表LIN中的内容及比特平面系数η的初始值大小，其中，所述η为整数，其值为卜所述c(i，j)为当前子带的小波系数值；对所构建金字塔结构中的所有小波系数进行分类；对分类得到的重要像素列表LSP中的小波系数执行细化操作；判断当前比特平面系数η与I的大小关系，如果η大于等于1，则令η=η-1，并返回执行所述分类操作、细化操作，直至执行所述当前比特平面系数η与I的大小关系的判断操作； 如果η小于1，则结束当前子带的小波系数完全编码过程，得到各子 CLAIMS 1. A method for encoding wavelet image, wherein the characteristics thereof, the method comprising: the wavelet coefficients of each sub-band L-level pyramid structure constructed, the L being an integer, L is the maximum value max {log :, log; 7}, wherein W and H are the current sub-band width and height; sub-band set as the current list of significant pixels and insignificant LSP LIN node list, and initializes the list of LSP provided significant pixels and insignificant in the node list LIN the contents of bit-planes and the initial value of the size coefficient η, wherein η is an integer having a value Bu said c (i, j) is the wavelet coefficient values ​​of the current sub band; all wavelet pyramid structure constructed classifying coefficient; thinning operations performed on the list of wavelet coefficients significant pixels obtained by classifying the LSP; determining the current bit-plane coefficient [eta] and I is the magnitude relation, if [eta] is greater than or equal to 1, then let η = η-1, and return execution the classification operation, detailed operation, performed until the current bit-plane coefficient η I and the magnitude relationship determination operation; if η is less than 1, the encoding process ends completely wavelet coefficients of the current sub-band, to give the sub- 带的压缩码流；根据各子带压缩码流的率失真特性，将目标码率在各子带的压缩码流间进行最优分配，依据各子带被分配的码率对各子带的码流进行截断，得到对小波图像进行编码的码流。 With the compressed stream; distortion of each sub-band code stream compression rate depending on the characteristics, will be compressed in each sub-optimal allocation of inter-band code stream target code rate, code rate based on each subband assigned to each sub-band truncated code stream to obtain a stream encoded image wavelet.
2. 2.根据权利要求1所述的小波图像的编码方法，其特性在于，所述为当前子带设置重要像素列表LSP和不重要节点列表LIN时，设置一个重要像素列表LSP和L个不重要节点列表LIN。 The encoding method according to claim 1 wavelet image, wherein the characteristics of the band setting important and unimportant pixel LSP list node list LIN, provided a significant pixel and the L unimportant LSP list for the current sub-nodes list LIN.
3. 3.根据权利要求1或2所述的小波图像的编码方法，其特性在于，所述在各子带的压缩码流间分配目标码率，依据被分配的码率截断码流的过程为：根据各子带的率失真特性确定各子带对应的最优截断点，根据所述的最优截断点对各子带的压缩码流进行截断。 The encoding method of claim 12 or claim wavelet image, the characteristics that the compression allocation in each sub-band between the target code rate streams, cut rate are assigned according to a process stream is: determining characteristics of each sub-band corresponding to the optimal truncation point, truncate each sub-band bit stream compressed according to the optimal cut-off point of the respective sub-bands according to the rate-distortion.
4. 4. 一种小波图像的编码装置，其特性在于，该装置包括：编码模块和截断模块；其中， 所述编码模块，用于对各子带的小波系数进行L级金字塔结构构建，所述L为整数，L的最大值，其中，所述W和H分别为当前子带的宽度和高度；为当前子带设置重要像素列表LSP和不重要节点列表LIN，初始化设置重要像素列表LSP和不重要节点列表LIN中的内容及比特平面系数η的初始值大小，其中，所述η为整数，其值为卜L 」5所述c(i，j)为当前子带的小波系数值；对所构建金字塔结构中的所有小波系数进行分类， 并对分类得到的重要像素列表LSP中的小波系数执行细化操作；还用于判断当前比特平面系数η与I的大小关系,确定η大于等于I时,令η=η-1,并返回执行所述分类操作、细化操作，直至执行所述当前比特平面系数η与I的大小关系的判断操作；确定η小于I时，结束当前 A wavelet image coding apparatus, wherein the characteristics thereof, the apparatus comprising: an encoding module and a truncation module; wherein the coding module, for performing the L-level pyramid of wavelet coefficients of each sub-band constructed, the L is an integer, L is a maximum value, wherein W and H are the current sub-band width and height; provided with a list of significant pixels and insignificant LSP sub-list for the current node LIN, initialization setting is not important and significant pixel LSP list LIN node list and the contents of bit-planes coefficient η size of the initial value, wherein the η is an integer having a value of L Bu "5 c (i, j) is the wavelet coefficient values ​​of the current sub band; of their when further configured to determine the current bit-plane coefficient η I with magnitude relation, greater than or equal to determine η I; all wavelet coefficients in pyramid structure constructed classification, and performs pixel thinning operations significant wavelet coefficients obtained classification list of LSP , so that η = η-1, and returns to perform the classification operation, detailed operation, performed until the current bit-plane coefficient of magnitude [eta] with the relationship I determination operation; determining [eta] is less than I, the end of the current 带的小波系数完全编码过程，得到各子带的压缩码流，并将所得的各子带的压缩码流传输给截断模块；所述截断模块，用于根据编码模块所发的各子带压缩码流的率失真特性，将目标码率在各子带的压缩码流间进行最优分配，并依据各子带被分配的码率对各子带的码流进行截断，得到对小波图像进行编码的码流。 Completely with the encoding process wavelet coefficients of each subband to obtain compressed stream, each sub-code and the resulting compressed stream to cut the belt module; the truncation module is configured to compress according to the respective sub-band coding module issued by stream rate distortion characteristics of the target code rate in each sub-band compression optimal distribution between streams, and truncating the code stream according to the respective sub-band is allocated for each sub-band rate to obtain images based on coding code stream.
5. 5.根据权利要求4所述的小波图像的编码装置，其特性在于，所述编码模块进一步包括：金字塔构建模块、初始化模块、分类模块、细化模块和量化模块；其中，所述金字塔构建模块，用于为当前编码的子带构建对应的金字塔结构，并将构建结果发送到初始化模块；所述初始化模块，用于为当前子带设置重要像素列表LSP和不重要节点列表LIN，并初始化设置不重要节点列表LIN和重要像素列表LSP中的内容及比特平面系数η的初始值大小，并将设置的结果发送到分类模块；所述分类模块，用于以初始化模块所发的初始值为依据对当前子带对应的金字塔结构中的所有小波系数进行分类，并将分类结果发送到细化模块；还用于收到量化模块所发的当前比特平面系数η后，以新的η为依据继续执行分类操作；所述细化模块，用于对分类模块分类得到的重要像素列表L The encoding device according to claim wavelet image, which is characteristic in that, said encoding module further comprising: pyramid construction module, initialization module, a classification module, refinement module and a quantization module; wherein the pyramid construction module used for the current sub-band coding construct corresponding pyramid, and send the results to build the initialization module; the initialization module is provided with a list of significant pixels and insignificant LSP as the current sub-node list LIN, and initialization settings LIN node list is not important and significant pixel content in the LSP list and the initial value of the size coefficient η of bit-planes, and transmits the result set to the classification module; the classification module is configured to initialize the module made according to the initial value of All pyramid wavelet coefficients corresponding to the current sub-band are classified, and sends the result to the classification refinement module; after receiving the quantization module is further configured to send the current bit-plane coefficient [eta], [eta] is a new basis continued performs classification operation; the refinement module, a classification module to classify the pixel important to obtain a list L SP中的小波系数执行细化操作，并在执行完当前细化操作后触发量化模块；还用于收到量化模块的通知后将当前子带的所有小波系数的细化结果发送到截断模块；所述量化模块，用于判断分类模块中当前比特平面系数η与I的大小关系，如果η大于等于1，则η减1，将递减后的η发送到分类模块，并触发分类模块以新的η为依据继续执行分类操作；所述量化模块，还用于确定分类模块中当前比特平面系数η小于I时，通知细化模块将当前子带的所有小波系数的细化结果发送到截断模块。 Wavelet coefficients SP performs thinning operation, and trigger quantization module after performing this refining operation; refine the results of all the wavelet coefficients after the quantization module is further configured to receive notification of the current sub-band to cut off the transmission module; the quantization module configured to determine the classification module the current bit-plane coefficient η I magnitude relation, if [eta] is greater than or equal to 1, the minus 1 [eta], [eta] will be sent to the classification module decremented, and trigger a new classification module η continue operations classified based; the quantization module is further configured to determine the classification module when the current bit-plane coefficient η is less than I, the notification will be sent refinement module to refine the results of all the wavelet coefficients to cutoff the current sub-band module.
6. 6.根据权利要求4或5所述的小波图像的编码装置，其特性在于，所述截断模块在各子带的压缩码流间分配目标码率，依据被分配的码率截断码流的操作为：根据各子带的率失真特性确定各子带对应的最优截断点，根据所述的最优截断点对各子带的压缩码流进行截断。 The encoding apparatus of claim 5 or claim wavelet image, the characteristics that the cutoff between the module allocation in the target code rate for each sub-band compressed stream, the stream truncation rate based on the allocated to: determine for each sub-band corresponding to the optimal truncation point, according to the optimal cut-off point of the compressed code stream for each sub-band truncation each sub-band according to the rate-distortion characteristics.
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