JP2006113334A - Image processing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image processing apparatus that can reduce power consumption during animation play back display in which display images are constantly updated. <P>SOLUTION: Based on coded data information 110 which is outputted from a decoding means 101 and stored in a coded data information memory means 102 and the condition with which the function of a display image generating means 106 stored in a display image generating means control information memory means 104 is stopped or lowered, the means 106 is stopped by a display image generation control means 103. Thus, display image generation control corresponding to the image to be displayed is made possible and the image processing apparatus, with which power consumption is reduced, is achieved. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention generally relates to an image processing apparatus, and more particularly to an image processing apparatus capable of displaying decoded image data with low power consumption.

  One of the circuit portions with high power consumption in an image processing apparatus that displays image data such as a decoded image of encoded data is an image display circuit. This is because the image processing apparatus is required to display an image at a high speed, and therefore it is necessary to process the image data at a high speed. As a conventional technique for realizing low power consumption of the display circuit, there is an image display device disclosed in Patent Document 1.

  FIG. 12 is a block diagram showing a configuration of the conventional image display apparatus.

  This image display device stores a display device 1210 for displaying image data, a display memory 1209 for temporarily storing image data for display, a display control circuit 1208 for controlling the display device 1210 and the display memory 1209, and image data. The image memory 1204 to be generated, the image generation circuit 1201 for generating the image data stored in the image memory 1204 as image data to be displayed on the display device 1210, and the image data for display for a predetermined time. An image generation circuit configured to include an image data change detection circuit 1205 that detects whether or not it has changed, a clock control circuit 1206 that controls transmission and stop of a clock signal, and a microprocessor 1207 that controls the whole. 1201 converts image data in the image memory 1204 to image data for display. An image data conversion circuit 1203, and an image generation control circuit 1202 sends a control signal of the image generation to the display control circuit 1208.

In the conventional image display apparatus, the image data change detection circuit 1205 detects whether or not the display image data has changed in the above configuration, and when there is no change, the clock control circuit 1206 supplies a clock to the image generation circuit 1201. By stopping the signal 120d, it is intended to reduce the power consumption while there is no change in the display image data.
JP-A-6-59655

  However, the conventional image data processing apparatus can reduce power consumption only when there is no change in display image data, and power consumption can be reduced during video playback display where the image changes constantly. There is almost no effect.

  SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and an object of the present invention is to provide an image processing apparatus that realizes a reduction in power consumption even when a moving image is reproduced and displayed such that an image constantly changes.

  In order to solve the above-described conventional problems, a first image processing apparatus according to the present invention decodes input encoded data and outputs encoded data information and decoded image data, and outputs from the decoding means Display based on the decoded image data stored in the image memory means for storing the decoded image data, the encoded data information memory means for storing the encoded data information output from the decoding means, and the image memory means Display image generation means for generating display image data for display, display memory means for storing display image data output from the display image generation means, and conditions for stopping or reducing the function of the display image generation means Display image generation means control information memory means for storing the encoded data information stored in the encoded data information memory means and the display image A display image generation control means for stopping or reducing the function of the display image generating unit based on the stored condition to forming means control information memory means, characterized in that it comprises a.

  According to the second image processing apparatus of the present invention, in the first image processing apparatus, the encoded data information output from the decoding unit and stored in the encoded data information memory unit is content information of encoded data. The condition stored in the display image generation means control information memory means is that the function of the display image generation means is stopped or lowered when the encoded data is the designated content.

  According to a third image processing apparatus of the present invention, in the first image processing apparatus, the decoding unit decodes encoded data in a certain pixel block unit called a macroblock, and the encoded data is output from the decoding unit. The encoded data information stored in the information memory means is encoded / unencoded information for each macroblock in the encoded data, and the condition stored in the display image generating means control information memory means is an unencoded macroblock When the number is larger than a specified value, the function of the display image generating means is stopped or lowered.

  According to a fourth image processing apparatus of the present invention, in the first image processing apparatus, the decoding unit decodes encoded data in a certain pixel block unit called a macroblock, and the encoded data is output from the decoding unit. The encoded data information stored in the information memory means is motion vector information for each macroblock in the encoded data, and the condition stored in the display image generation means control information memory means is based on the value specified for the motion vector. When it is small, the function of the display image generating means is stopped or lowered.

  According to a fifth image processing apparatus of the present invention, in the fourth image processing apparatus, when the encoded data information is stored in the encoded data information memory means, motion vector information for each macroblock is accumulated for each macroblock. Encoded data information clearing means for calculating and storing, and further, when the display image is generated by the display image generating means, the motion vector accumulated value for each macroblock stored in the encoded data information memory means is cleared to zero. And the condition stored in the display image generation means control information memory means is to stop or reduce the function of the display image generation means when the motion vector accumulated value is smaller than a specified value. It is characterized by.

  According to a sixth image processing apparatus of the present invention, in the fourth or fifth image processing apparatus, the macro in the encoded data is encoded data information output from the decoding unit and stored in the encoded data information memory unit. Intra-frame prediction / inter-frame prediction information for each block is added, and the condition stored in the display image generation means control information memory means is that the motion vector / motion vector accumulated value is smaller than a specified value and intra-frame prediction When the number of macro blocks is smaller than a specified value, the function of the display image generating means is stopped or lowered.

  According to a seventh image processing apparatus of the present invention, display image generating means control information for setting / changing externally the conditions stored in the display image generating means control information memory means in addition to the first to sixth image processing apparatuses. And a setting unit, wherein a condition for stopping or reducing the function of the display image generation unit in the display image generation unit control can be controlled from the outside.

  With this configuration, it is possible to realize a reduction in power consumption even during moving image reproduction display in which images constantly change.

  According to the image processing apparatus of the present invention, content information, intra-frame prediction / inter-frame prediction information for each macroblock, encoding / non-coding information, and motion vector information obtained when decoding encoded data are decoded. By controlling the display image generation means to stop or reduce the display image generation means, it is possible to control the display image generation means according to the movement of the image even during moving image playback display where the image changes constantly. Reduction can be realized.

  Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1)
FIG. 1 is a block diagram of an image processing apparatus according to Embodiment 1 of the present invention. Decoding means 101 for decoding input encoded data 108 and outputting encoded data information 110 and decoded image data 109; The image memory means 105 that stores the decoded image data 109 output from the 101, the encoded data information memory means 102 that stores the encoded data information 110 output from the decoding means 101, and the image memory means 105 Display image generating means 106 for generating display image data 112 for reading and displaying the decoded image data 109, display memory means 107 for storing the display image data 112 output from the display image generating means 106, and display image generating means Display image generation means control for storing conditions for stopping or reducing the function of 106 The function of the display image generation means 106 is stopped or reduced based on the information memory means 104 and the encoded data information stored in the encoded data information memory means 102 and the conditions stored in the display image generation means control information memory means 104. Display image generation control means 103 is provided.

  FIG. 2 is a block diagram of the decoding unit 101. For the content information included in the input encoded data 108, the start information and the end code are detected, and the content information 208 is acquired and output as one of the encoded data information 110. Content information decoding processing means 201, and start code and end code detection, acquisition of various parameters, and variable length code decoding processing on the encoded image data included in the input encoded data 108, image size, macro Intra / Inter flag indicating intra-frame prediction / inter-frame prediction for each block (described later), and when the macro block is inter-frame prediction, encoded data (motion vector information, quantized discrete cosine transform coefficient) of the macro block is Encoding / non-encoding flag (in case of inter-frame prediction) and motion indicating whether or not it is included Qutre information (when inter-frame prediction and encoded data is included), quantized discrete cosine transform coefficients (when encoded data is included) are acquired, and acquired Intra / Inter flags and codes as one of the encoded data information 110 Variable-length code decoding processing means 202 that outputs an encoding / non-coding flag and motion vector information 210, and inverse quantization processing is performed on the quantized discrete cosine transform coefficient output from the variable-length code decoding processing means 202, Inverse quantization processing means 203 for outputting the quantized discrete cosine transform coefficients, and inverse discrete cosine transform processing for the inverse quantized discrete cosine transform coefficients output from the inverse quantization processing means 203 to obtain decoded image data (intra-frame) Prediction)) / inverse discrete cosine transform processing means 204 for outputting residual image data (in the case of inter-frame prediction); Motion compensation processing means 205 for generating and outputting reference image data from the motion vector information output from the variable-length code decoding processing means 202 in the case of inter-frame prediction and the decoded image data of the previous frame; The decoded image data output from the discrete cosine transform processing unit 204 is output as decoded image data 109. In the case of inter-frame prediction, residual image data output from the inverse discrete cosine transform processing unit 204 and output from the motion compensation processing unit 205 The reconstructed image generation processing unit 206 outputs the added reference image data for each pixel and outputs the addition result as decoded image data 109.

  FIG. 3 is a diagram showing the structure of the encoded data 108 input to the decoding means 101. The content information 302 is preceded by the start code 32 bits (0x000001B7) and the end code 8 bits (0xFF). It is inserted as a character string using the character code shown.

  After that, the encoded image data 303 is inserted up to the end code 32 bits (0x000001B1) after the start code 32 bits (0x000001B0).

  The encoded image data includes 16 bits of image size information (8 bits each in the vertical and horizontal directions) at the head, and then encoded data (frame 0 data, frame 1 data, each frame) which is an encoding processing unit for each screen. )).

  The encoded data 304 for each frame has a start code of 32 bits (0x000001B6), and then encoded data (MB0 data, MB1 data) for each “macroblock (MB)” which is the encoding processing unit in the screen shown in FIG. ,)). When the image size is vertical, horizontal = 176, 144, and the macroblock size is vertical, horizontal = 16, 16 (units are pixels), each macroblock included in the encoded data (Frame0,) for each frame The number of data (MB0,...) Is 99 (up to MB98).

  The coded data 305 for each macroblock includes an Intra / Inter flag 1 bit (0x0 for intraframe prediction, 0x1 for interframe prediction) indicating whether the macroblock is intraframe prediction / interframe prediction, and the macroblock. In the case of inter-frame prediction, one bit of encoded / unencoded flag (encoded data is included) indicating whether or not encoded data (motion vector information, quantized discrete cosine transform coefficient) of the macroblock is included. 0x0 if the encoded data is not included, and 0x1 if the encoded data is not included (when the encoded data is not included, the macroblock decoded image data at the same position in the previous frame is used as the decoded image data of the frame)) When inter-prediction and encoded data are included, reference is made from the decoded image data of the previous frame. Motion vector information 18 bits for identifying the image data (vertical, for each horizontal 9 bits), followed by a quantum of the discrete cosine transform coefficients variable-length code.

  Here, a typical motion compensation process using the decoded image data and the motion vector of the previous frame will be briefly described with reference to FIG.

  The image size shown in FIG. 6 is vertical and horizontal = 176 and 144, and the macroblock size is vertical and horizontal = 16, and 16 (units are pixels).

  When a macroblock (MB0) of a certain encoding target frame 602 is processed as inter-frame prediction at the time of encoding processing, it is closest to MB0 from the decoded image data 601 of the previous frame (the sum of absolute differences in pixel units is The pixel block is searched for. If the pixel block position searched here is the position of MB13, the motion vector 603 (vertical, horizontal = + 32, +16 (unit is pixel)) indicating the position of MB0 → MB13 and the encoding target frame 602 ( The variable length code 604 obtained by performing discrete cosine transform, quantization, and variable length coding on the residual image data obtained by subtracting the decoded image data 601 (MB13) of the previous frame from MB0) for each pixel is decoded as the encoded data 605. Sent to the process.

  In the decoding process, the decoding process is realized by following the procedure opposite to the above from the motion vector included in the received encoded data 605, the quantized discrete cosine transform coefficient of the residual image data, and the decoded image data of the previous frame. To do.

  Note that variable length code (decoding) processing, intra-frame prediction / inter-frame prediction, (inverse) quantization processing, (inverse) discrete cosine transform processing, and reconstructed image generation processing are represented by MPEG (Moving Picture Coding Experts Group). This is a general technique adopted in the international standard for encoding / decoding processing of image data, and a specific method of these processing is not a feature of the present invention, and thus description thereof is omitted.

  FIG. 7 is a diagram showing the configuration of the encoded data information 110 stored in the encoded data information memory means 102.

  FIG. 7A shows an area for storing content information, and the content information included in the encoded data is stored up to the end code (0xFF) using the character code shown in FIG.

  FIG. 7B is an area for storing an Intra / Inter flag (0x0 for intra-frame prediction, 0x1 for inter-frame prediction), and the total number of macroblocks included in the encoded data for each frame (this embodiment) In this case, 99) minutes are stored in order from the top.

  FIG. 7C shows an area for storing an encoding / non-encoding flag (0x0 when encoded data is included, 0x1 when encoded data is not included), and all areas included in the encoded data for each frame. The number of macroblocks (99 in this embodiment) is stored in order from the top. However, this flag is stored only when the Intra / Inter flag is inter-frame prediction (0x1). When the Intra / Inter flag is intra-frame prediction (0x0), the area for the macroblock is empty. .

  FIG. 7D is an area for storing motion vector information, and the total number of macroblocks (99 in the present embodiment) included in the encoded data for each frame is stored in order from the top in the vertical and horizontal directions. . However, this information is stored only when the Intra / Inter flag is inter-frame prediction (0x1) and the encoded / uncoded flag includes encoded data (0x0), and the Intra / Inter flag is a frame. When the intra prediction (0x0) or the encoded / uncoded flag does not include encoded data (0x1), the area for the macroblock is empty.

  FIG. 8 is a diagram showing a configuration of conditions for stopping or lowering the function of the display image generating means 106 stored in the display image generating means control information memory means 104.

  The condition shown in FIG. 8 includes a comparison target, a comparison condition, and a comparison value. For example, when the content information included in the encoded data matches a certain character string ('CMABC'), the function of the display image generation unit 106 is performed. In order to stop or reduce, the comparison target = “content information”, the comparison value = “CMABC”, and the comparison condition = “match (==)” are designated. In order to stop or reduce the function of the display image generation means 106 when the number of non-encoded macro blocks is 0x42 or more among all the macro blocks included in the encoded data for each frame, the comparison target = “non- The number of encoding macroblocks, comparison value = “0x42”, and comparison condition = “more than (> =)” are designated.

  Each condition has an AND / OR flag. This is a flag for designating whether the condition is treated as a logical product (AND) or a logical sum (OR) with respect to the immediately preceding condition. For example, the function of the display image generation unit 106 is stopped or lowered when the maximum value of the motion vector is 0x10 or less and the number of intra-frame prediction macroblocks is 0xa or less among all macroblocks included in the encoded data for each frame. In order to do this, comparison target = “motion vector maximum value”, comparison value = “0x10”, comparison condition = “below (<=)”, AND / OR = “OR”, comparison target = “intra-frame prediction macroblock” “Number”, comparison value = “0xa”, comparison condition = “below (<=)”, AND / OR = “AND” are designated.

  Hereinafter, a description will be given along the flow of processing with reference to FIGS.

  When the encoded data 108 is input to the decoding unit 101, first, the content information decoding processing unit 201 detects the start code 32 bits (0x000001B7) of the content information from the encoded data 207, and thereafter, the end code 8 bits (0xFF) ) Until the content information (in the case of the content information 302 shown in FIG. 3, “CMABC”) is acquired in units of 8 bits. If the 32 bits (0x000001B7) of the content information start code is not detected, the processing in the content information decoding processing unit 201 is skipped. The acquired content information 208 is output and stored in the encoded data information memory unit 102 as one of the encoded data information 110 in the configuration shown in FIG.

  Next, the variable length code decoding means 202 detects the start code 32 bits (0x000001B0) of the encoded image data from the encoded data 108, and the subsequent image size information 16 bits (each 8 bits in the vertical and horizontal directions) (see FIG. In the case of the encoded image data 303 shown in FIG. 3, vertical and horizontal = 176, 144 (units are pixels))) is acquired, and the encoded data for each frame is decoded thereafter.

  In the decoding of the encoded data for each frame (Frame 0 data, Frame 1 data,...), The start code 32 bits (0x000001B6) of the encoded data for each frame is detected from the encoded data 108, and thereafter the encoded data for each macroblock. Is decrypted.

  Decoding of the encoded data (MB0 data, MB1 data, MB98 data) for each macroblock is performed by 1 bit of Intra / Inter flag indicating that the macroblock is intraframe prediction / interframe prediction (in the case of intraframe prediction, 0x0, In the case of inter-frame prediction, 0x1) is obtained, and only when the Intra / Inter flag is inter-frame prediction (0x1), encoded data (motion vector information, quantized discrete cosine transform coefficient) of the macroblock is included. Encoding / non-encoding flag indicating 1 bit (0x0 when encoded data is included, 0x1 when encoded data is not included), and then intra / inter flag is inter-frame prediction (0x1) and encoded / Only when the non-encoded flag contains encoded data (0x0) 18-bit vector information (9 bits each in the vertical and horizontal directions) is acquired, and only when the encoded / unencoded flag includes encoded data (0x0), the quantized discrete cosine transform coefficient variable length code is A variable length code decoding process is performed to obtain quantized discrete cosine transform coefficients.

  The acquired Intra / Inter flag, encoded / non-encoded flag, and motion vector information 210 are encoded data information memory means 102 having the configuration shown in FIGS. 7B to 7D as one of encoded data information 110. Is output and stored.

  The quantized discrete cosine transform coefficient acquired by the variable length code decoding processing means 202 is subjected to inverse quantization processing by the inverse quantization processing means 203, and inverse discrete cosine transform processing by the inverse discrete cosine transform processing means 204, and the Intra / Inter If the flag is intra-frame prediction, decoded image data is generated. If the flag is inter-frame prediction, residual image data is generated.

  If the Intra / Inter flag is inter-frame prediction (0x1) and the encoded / uncoded flag includes encoded data (0x0), the motion vector information acquired by the variable-length code decoding processing unit 202 and the previous frame Reference image data is generated by the motion compensation processing means 205 from the decoded image data.

  When the Intra / Inter flag is inter-frame prediction (0x1) and the encoded / unencoded flag does not include encoded data (0x1), the motion compensation processing unit 205 uses the same macro from the decoded image data of the previous frame. The image data at the block position is set as decoded image data. When the Intra / Inter flag is intra-frame prediction (0x0), the reconstructed image generation processing unit 206 outputs the decoded image data generated by the inverse discrete cosine transform processing unit 204 as decoded image data 109, and the Intra / Inter flag Is the inter-frame prediction (0x1) and the encoded / unencoded flag includes the encoded data (0x0), the reference image data generated by the motion compensation processing means 205 and the inverse discrete cosine transform processing means 204 are generated. The added residual image data is added in units of pixels, the addition result is output as decoded image data 109, the Intra / Inter flag is inter-frame prediction (0x1), and the encoded / uncoded flag does not include encoded data In the case of (0x1), the decoded image data generated by the motion compensation processing unit 205 is converted into decoded image data. Is output as data 109.

  The decoded image data 109 output from the decoding unit 101 is stored in the image memory unit 105.

  The decoded image data 109 stored in the image memory means 105 is read by the display image generating means 106, converted into display image data 112, stored in the display memory means 107, and displayed on a display device (not shown). Is output as

  On the other hand, the display image generation means control information memory means 104 stores in advance conditions for stopping or reducing the function of the display image generation means 106 shown in FIG.

  The display image generation control unit 103 displays the display image based on the encoded data information 110 stored in the encoded data information memory unit 102 and the condition 111 stored in the display image generation unit control information memory unit 104 shown in FIG. It is determined whether or not the function of the generation unit 106 is to be stopped or reduced. If the condition is satisfied, the display image generation unit 106 is stopped, generation of the display image data 112 is stopped, and power consumption is reduced.

  When the conditions 111 for stopping or lowering the functions of the encoded data information 110 and the display image generation means 106 are the configurations shown in FIGS. 7 and 8, in the first condition, the comparison target = “content information” and the comparison condition = “Match (==)” and comparison value = “CMABC”, and the condition is satisfied for the content information (“CMABC”) shown in FIG.

  Under the second condition, the comparison target = “number of uncoded macroblocks”, the comparison condition = “more than (> =)”, and the comparison value = “0x42”. Intra / Inter shown in FIG. The number of macroblocks that are non-encoded (0x1) in the encoding / non-encoding flag shown in FIG. 7C for the macroblocks that are inter-frame prediction (0x1) by the flag is shown for MB0 to MB98. Counting (assuming that the number of non-encoded macroblocks is 50 here), the condition is not satisfied.

  In the third condition, the comparison target = “motion vector maximum value”, the comparison condition = “below (<=)”, and the comparison value = “0x10”, and the Intra / Inter flag shown in FIG. A search is performed for MB0 to MB98 for the maximum value in motion vector information for a macroblock that is interframe prediction (0x1) and encoded (0x0) with the encoding / non-encoding flag shown in FIG. (Assuming that the maximum value of the motion vector is 0xa), the condition is satisfied.

  In the fourth condition, comparison target = “number of intra-frame prediction macroblocks”, comparison condition = “below (<=)”, comparison value = “0xa”, and Intra / Inter shown in FIG. The number of macroblocks that are in-frame prediction (0x0) by the flag is counted for MB0 to MB98 (assuming that the number of intra-frame prediction macroblocks is 9 here), and the condition is satisfied.

  The AND / OR designation of each condition is the second condition = “OR”, the third condition = “OR”, and the fourth condition = “AND”. First condition (satisfied) OR Second condition (unsatisfied) OR (third condition (satisfied) AND fourth condition (satisfied)) is established.

(Embodiment 2)
FIG. 9 is a block diagram of an image processing apparatus according to Embodiment 2 of the present invention. In addition to the image processing apparatus shown in FIG. 1, the encoded data information 110 stored in the encoded data information memory means 102 includes motion vector information. In this case, the result of accumulation for each macroblock is stored, and when the display image data 112 is generated by the display image generation means 106, the motion vector accumulation for each macroblock stored in the encoded data information memory means 102 is stored. A coded data information clearing unit 915 for clearing the value to zero and a display image generating unit control information setting unit 914 for setting / changing the conditions stored in the display image generating unit control information memory unit 104 from the outside are provided.

  FIG. 10 shows the correspondence between the encoded data information (motion vector information) 110 output from the decoding means 101, the motion vector accumulated value for each macroblock stored in the encoded data information memory means 102, and the motion vector accumulation. It is explanatory drawing which shows the state in which the motion vector accumulated value was zero-cleared by the initial state of the value and the encoded data information clear means 915.

  FIG. 10A is a diagram showing an initial state of a region where the motion vector accumulated value is stored in the encoded data information memory means 102 and a state where the motion vector accumulated value is cleared to zero by the encoded data information clear means 915. Yes, the motion vector accumulation value for all macroblocks (MB0 to MB98) is 0x000.

  FIG. 10B is a diagram showing a state when motion vector information is input as the encoded data information 110 from the decoding unit 101. The motion vector information in the encoded data information memory unit 902 is shown in the state (MB1 In the case of vertical and horizontal = 0x020, 0x010), the motion vector accumulated value is obtained by adding the value stored in the motion vector information to the initial state (all MBs are 0x000), and the state shown in FIG. Horizontal = 0x020, 0x010, and other MBs are all 0x000).

  FIG. 10C is a diagram showing a state when motion vector information is further input as the encoded data information 110 from the decoding unit 101. The motion vector information in the encoded data information memory unit 102 is shown in the state ( In the case of MB0 vertical, horizontal = 0x001, 0x002, MB1 vertical, horizontal = 0x003, 0x004, MB98 vertical, horizontal = 0x005, 0x006), the motion vector accumulated value is the state shown in FIG. 10B (MB1). The values stored in the motion vector information are added to the vertical and horizontal = 0x020, 0x010, all other MBs are 0x000, and the state shown in the figure (vertical and horizontal of MB0, horizontal = 0x001, 0x002, vertical and horizontal of MB1 = 0x023, 0x014, length of MB98, width = 0x005, 0x006, and other MBs are all 0x000).

  FIG. 11 is a block diagram showing conditions for stopping or lowering the function of the display image generation means 106 stored in the display image generation means control information memory means 904 via the display image generation means control information setting means 914. .

  The display image generation unit control information setting unit 914 designates a condition number and sets a comparison target, a comparison condition, a comparison value, and an AND / OR. FIG. 11A shows a comparison target = “Accumulated motion vector maximum value”, comparison condition = “below (<=)”, comparison value = “0x10” is stored, and each macroblock stored in the encoded data information memory means 102 is stored. When the maximum value of the motion vector accumulated value is 0 × 10 or less, the display image generation control unit 103 stops the function of the display image generation unit 106.

  Under the above conditions, when the maximum motion vector accumulated value for each macroblock is 0x10 or less, the function of the display image generating means 106 is stopped (== generation of display image data (display update) is stopped).

  However, at the time of moving image playback display, etc., depending on the image, the user may think that “I want to update the display only when there is a little bigger movement and reduce power consumption”. In such a case, the conditions stored in the display image generation unit control information memory unit 104 are set / changed again via the display image generation unit control information setting unit 914.

  FIG. 11B shows a state in which comparison target = “accumulated motion vector maximum value”, comparison condition = “below (<=)”, and comparison value = “0x20” are stored in the first condition. When the maximum motion vector accumulated value for each macroblock stored in the digitized data information memory means 102 is 0x20 or less, the display image generation control means 103 stops the function of the display image generation means 106.

  The image processing apparatus according to the present invention decodes encoded data, and displays encoded data information (content information, within each frame for each macroblock), such as when displaying and displaying decoded image data. Display image generation processing based on the display image can be performed by executing / stopping the display image generation processing based on prediction / interframe prediction, presence / absence of encoded data, motion vector information, etc.), and low power consumption Therefore, it is useful as an image processing apparatus for extending a continuous operation time (battery driving time) in a battery-driven portable terminal such as a mobile phone equipped with a moving image reproduction function.

1 is a block diagram of an image processing apparatus showing Embodiment 1 of the present invention. The block diagram of the decoding means which shows Embodiment 1 of this invention Configuration diagram of encoded data showing Embodiment 1 of the present invention The figure which shows the character code table | surface which shows Embodiment 1 of this invention Explanatory drawing of the encoding unit which shows Embodiment 1 of this invention Explanatory drawing of the motion compensation process which shows Embodiment 1 of this invention Configuration diagram of encoded data information showing Embodiment 1 of the present invention Configuration diagram of display image generation means control conditions showing Embodiment 1 of the present invention The block diagram of the image processing apparatus which shows Embodiment 2 of this invention. Configuration diagram of encoded data information showing Embodiment 2 of the present invention Configuration diagram of display image generation means control condition showing Embodiment 2 of the present invention The block diagram which shows the structure of the conventional image display apparatus

Explanation of symbols

DESCRIPTION OF SYMBOLS 101 Decoding means 102 Encoded data information memory means 103 Display image generation control means 104 Display image generation means control information memory means 105 Image memory means 106 Display image generation means 107 Display memory means 108 Encoded data 109 Decoded image data 110 Encoded data Information 111 Conditions for stopping or reducing the function of the display image generation means 112 Display image data 113 Display data 201 Content information decoding processing means 202 Variable length code decoding processing means 203 Inverse quantization processing means 204 Inverse discrete cosine transform processing means 205 Motion compensation processing Means 206 Reconstructed image generation processing means 208, 302 Content information 210 Intra / Inter flag, encoding / non-coding flag, motion vector information 303 Image encoded data 304 Code for each frame Data 305 Coded data for each macroblock 401, 402 Character code table 501 Frame 502 Macroblock 601 Previous frame decoded image data 602 Encoding target frame 603 Motion vector 604 Variable length code 605 Coded data 606 Adder 607 Discrete cosine transform Processing means 608 Quantization processing means 609 Variable length code processing means 701 Encoded data information (content information) stored in encoded data information memory means
702 Encoded data information (Intra / Inter flag) stored in the encoded data information memory means
703 Encoded data information (encoded / unencoded flag) stored in the encoded data information memory means
704, 1002, 1004 Encoded data information (motion vector information) stored in the encoded data information memory means
801, 1101, 1102 Conditions for stopping or lowering the function of the display image generation means stored in the display image generation means control information memory means 914 Display image generation means control information setting means 915 Encoded data information clear means 1001, 1003, 1005 Encoded data information (motion vector accumulated value) stored in the encoded data information memory means

Claims (7)

Decoding means for decoding input encoded data and outputting encoded data information and decoded image data;
Image memory means for storing decoded image data output from the decoding means;
Encoded data information memory means for storing encoded data information output from the decoding means;
Display image generation means for generating display image data for display based on the decoded image data stored in the image memory means;
Display memory means for storing display image data output from the display image generating means;
Display image generation means control information memory means for storing conditions for stopping or reducing the function of the display image generation means;
Display image generation control means for stopping or reducing the function of the display image generation means based on the encoded data information stored in the encoded data information memory means and the conditions stored in the display image generation means control information memory means When,
An image processing apparatus comprising: The encoded data information output from the decoding means and stored in the encoded data information memory means is content information of encoded data,
2. The condition stored in the display image generation means control information memory means is to stop or reduce the function of the display image generation means when the encoded data is a designated content. The image processing apparatus described. The decoding means decodes encoded data in a certain pixel block unit called a macroblock,
The encoded data information output from the decoding means and stored in the encoded data information memory means is encoded / unencoded information for each macroblock in the encoded data,
The condition stored in the display image generation means control information memory means is to stop or reduce the function of the display image generation means when the number of uncoded macroblocks is larger than a specified value. The image processing apparatus according to claim 1. The decoding means decodes encoded data in a certain pixel block unit called a macroblock,
The encoded data information output from the decoding means and stored in the encoded data information memory means is motion vector information for each macroblock in the encoded data,
2. The condition stored in the display image generation means control information memory means is that the function of the display image generation means is stopped or lowered when the motion vector is smaller than a specified value. The image processing apparatus described. When the encoded data information is stored in the encoded data information memory means, motion vector information for each macroblock is accumulated and stored for each macroblock, and when a display image is generated by the display image generating means Encoded data information clearing means for clearing the motion vector accumulated value for each macroblock stored in the encoded data information memory means to zero;
With
The condition stored in the display image generation means control information memory means is that the function of the display image generation means is stopped or lowered when the motion vector accumulated value is smaller than a specified value. The image processing apparatus according to claim 4. Add intra-frame prediction / inter-frame prediction information for each macroblock in the encoded data as encoded data information output from the decoding means and stored in the encoded data information memory means,
The display image is generated when the condition stored in the display image generation means control information memory means is smaller than the designated value and the number of intra-frame prediction macroblocks is smaller than the designated value. 6. The image processing apparatus according to claim 4, wherein the function of the generating means is stopped or lowered. Display image generation means control information setting means for externally setting / changing conditions stored in the display image generation means control information memory means;
With
The image processing apparatus according to claim 1, wherein a condition for stopping or reducing the function of the display image generation unit in the display image generation unit control can be controlled from the outside.

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