JP2009225383A - Projection apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve determination accuracy in still image/motion image determination. <P>SOLUTION: Image data of a preceding frame are compared with image data of a following frame to calculate a difference value therebetween (step SA2), and the calculated difference value is leveled to set levels 1 to 4 (step SA3). In the case of "level 1", three frames are set (step SA5), in the case of "level 2", four frames are set (step SA7) and in the case of "level 3", five frames are set (step SA9). Furthermore, when all the "level 1" to "level 3" are not corresponding, since the level set in the step SA3 is "level 4", six frames are set (step SA10). When the number of frames 3 to 6 is set, still image/motion image determination processing is performed using the set number of frames (step SA11). <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a projection apparatus, a projection control program, and a still image moving image determination method.

  Conventionally, a projector is proposed that determines whether an image to be projected and displayed is a still image or a moving image, and performs processing based on the determination result, thereby performing an optimal image projection according to the still image and the moving image. Has reached. The projector includes a luminance distribution change amount calculation unit, a still image moving image determination unit, a gradation correction processing unit, and a display unit. The luminance distribution change amount calculation unit calculates a change amount of the luminance distribution of the image between the previous and next frames to be compared, and the still image moving image determination unit determines whether the image is a still image or a moving image based on the change amount of the luminance distribution. It is determined whether the image is any of them.

That is, when the amount of change is large, it is determined as a moving image, and when it is small, it is determined as a still image. The gradation correction processing unit performs predetermined gradation correction processing based on the determination result of the still image moving image determination unit, and the display unit projects and displays the image subjected to the gradation correction processing (see, for example, Patent Document 1). .
JP 2004-32207 A

  However, in today's projection environment, there are miscellaneous and unspecified noises that affect the image data, so the frame image data that the projector uses for projection may also be affected by the noise. For this reason, due to noise, there may be a large amount of change between the preceding and following frames even in the case of a still image. Therefore, when still image moving image determination is performed simply based on the amount of change between the previous and next frames as in the prior art, there is a problem that erroneous determination occurs due to noise.

  The present invention has been made in view of such conventional problems, and an object thereof is to provide a projection device, a projection control program, and a still image moving image determination method capable of improving the determination accuracy of still image moving image determination. .

  In order to solve the above-mentioned problem, in the projection apparatus according to the first aspect of the present invention, image data is sequentially fetched in units of frames, and still image moving image determination is performed on the captured image data. In the projection apparatus that executes the processing according to the detection unit, a detection unit that detects the state of the captured image data, a setting unit that variably sets the number of frames according to the state detected by the detection unit, and the setting unit And still image / moving image determining means for executing the still image / moving image determination based on the image data of the number of frames set by the above.

  In the projection apparatus according to the second aspect of the invention, the detection unit calculates a difference value between adjacent frames that are sequentially taken in, and the difference value calculated by the calculation unit. And determining means for determining the state of the image data, wherein the setting means sets the number of frames according to the state of the image data determined by the determining means.

  Further, in the projection device according to the invention of claim 3, the detection means includes standard information detection means for detecting different standard information for each standard of the image data included in the captured frame, A calculation unit that calculates a difference value between the standard information and the standard information stored in advance by the standard information detection unit, and a determination that determines the state of the image data based on the difference value calculated by the calculation unit. And the setting means sets the number of frames according to the state of the image data determined by the determining means.

  Further, in the projection device according to the invention of claim 4, the determination unit includes a storage unit that stores the state corresponding to the difference value, and a state corresponding to the difference value from the storage unit. Reading means for reading.

  Further, in the projection apparatus according to the fifth aspect of the invention, the determination unit determines which of the plurality of levels the difference value calculated by the calculation unit belongs, and determines the level determination result. The state of the image data is provided to the setting unit, and the setting unit sets the number of frames according to the level determination result.

  According to a sixth aspect of the present invention, a determination means for determining whether the difference value calculated by the calculation means is “0” or less than a predetermined value, and the difference value is determined by the determination means. When it is determined that the value is “0” or less than a predetermined value, it is determined that the image is a still image, and the process according to the determination result is performed without operating the setting unit and the still image moving image determination unit. Means are provided.

  Further, in the projection device according to claim 7, the still image moving image determining means is based on a difference value between adjacent frames in the number of frames set by the setting means. Judgment is performed.

  Further, in the projection apparatus according to the invention of claim 8, the still image moving image determination means is based on a difference value between a first frame and other frames in the number of frames set by the setting means. Still image moving image determination is executed.

  In the projection control program according to the ninth aspect of the present invention, image data is sequentially fetched in units of frames, still image moving image determination is performed on the captured image data, and processing according to the determination result is performed. By means of a detection means for detecting the state of the captured image data, a setting means for variably setting the number of frames according to the state detected by the detection means, and a setting means Based on image data of the set number of frames, the image processing apparatus functions as a still image / moving image determination unit that executes the still image / moving image determination.

  In the still image moving image determination method according to the invention of claim 10, the image data is sequentially fetched in units of frames, the still image moving image determination is performed on the captured image data, and the determination result is determined. A still image moving image determination method in a projection apparatus that executes processing, comprising: a detection step for detecting a state of the captured image data; and a setting for variably setting the number of frames according to the state detected by the detection step And a still image / moving image determining step for executing the still image / moving image determination based on the image data of the number of frames set in the setting step.

  According to the present invention, it is possible to improve the determination accuracy of still image / moving image determination, and accordingly, it is possible to accurately project and perform an appropriate process according to the still image and the moving image.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
(First embodiment)
FIG. 1 is a block diagram showing an electrical configuration of a projector 1 common to the embodiments of the present invention. The projector 1 includes a control unit 11, an input / output interface 12, an image conversion unit 13, a display encoder 14, a display drive unit 15, and the like. (Image data) is converted to an image signal of a predetermined format suitable for display by the image converter 13 via the input / output interface 12 and the system bus 17 and then sent to the display encoder 14.

  The display encoder 14 develops and stores the transmitted image signal in the video RAM 18, generates a video signal from the stored contents of the video RAM 18, and outputs the video signal to the display driving unit 15.

  The display driving unit 15 to which the video signal is input from the display encoder 14 drives the display element 19 which is a spatial light modulation element (SOM) at an appropriate frame rate in accordance with the transmitted image signal. Then, the light beam emitted from the light source device 20 is incident on the display element 19 through the light source side optical system, thereby forming a light image with the reflected light of the display element 19 to form a projection side optical system. An image is projected and displayed on a screen (not shown) via the group 21. The movable lens group 21 of the projection side optical system is driven by a lens motor 22 for zoom adjustment and focus adjustment.

  The image compression / decompression unit 23 performs recording processing for compressing the luminance signal and the color difference signal in the image signal by processing such as ADTC and Huffman coding, and writing the data onto a memory card 24 that is a detachable recording medium. The image data recorded in the memory card 24 is read out, the individual image data constituting a series of moving images is expanded in units of one frame, sent to the display encoder 14 via the image conversion unit 13, and stored in the memory card 24. Based on the above, it is possible to display a moving image or the like.

  The control unit 11 controls the operation of each circuit in the projector 1, and includes a CPU and its peripheral circuits, a ROM 111, a RAM 112, and the like. The ROM 111 stores programs such as various settings, programs and data shown by flowcharts described later, and the RAM 112 is used as a work memory or the like.

  The key / indicator unit 25 includes a main key and an indicator provided in the main body case and the like, and an operation signal thereof is sent to the control unit 11. The key operation signal from the remote controller is received by the Ir receiver 26, demodulated by the Ir processor 27, and the code signal is sent to the controller 11.

  The ROM 111 stores a level setting table LT shown in FIG. In this level setting table LT, a difference value, a level, and the number of set frames are stored correspondingly. The difference value is a value of a difference in image data between the preceding and succeeding frames in image data of various standards sequentially input from the input / output connector unit 16 via the input / output interface 12. More than B, less than B, less than B and less than C, and more than C. The level is a level value corresponding to each of these difference values, and consists of “1” to “4”. The set frame number is set corresponding to each level, and indicates the number of frames used for still image moving image determination described later.

  In the first embodiment having the above-described configuration, the control unit 11 of the projector 1 executes processing as shown in the flowchart of FIG. 3 based on a program stored in the ROM 111. That is, image data supplied to the input / output connector unit 16 at a frame rate in accordance with the standard of the image data supplied from a personal computer or the like, or image data read out from the memory card 24 at a frame rate in accordance with the standard. Input (step SA1). Next, the difference value is calculated by capturing the image data of the previous frame and comparing it with the image data of the subsequent frame (step SA2).

  That is, each pixel in the image data of the previous frame is compared with the corresponding pixel in the image data of the subsequent frame, and the difference is digitized. Then, the difference values of the image data of the previous and subsequent frames are calculated for one frame by averaging or summing the difference values digitized for each pixel.

  Subsequently, the difference value calculated in step SA2 is leveled (step SA3). This leveling of the difference value is performed with reference to the level setting table LT shown in FIG. That is, if the difference value calculated in step SA2 is “0 or more and less than A”, it is “level 1”, if it is “A or more and less than B”, it is “level 2”, and “B or more and less than C”. “Level 3” is set in this case, and “Level 4” is set in the case of “C or higher”.

  Next, it is determined whether the level set in step SA3 is “level 1” to “level 3” (steps SA4, SA6, SA8). Then, referring to the level setting table LT, if it is “level 1”, 3 frames are set (step SA5), and if it is “level 2”, 4 frames are set (step SA7). If “3”, 5 frames are set (step SA9). If the determination in step SA8 is NO and none of “level 1” to “level 3”, the level set in step SA3 is “level 4”, so 6 frames are set ( Step SA10).

  At this time, since the level increases as the difference value increases, the number of frames proportional to the difference value can be set. When the number of frames 3 to 6 is set in this way, the still image moving image determination process is executed with the set number of frames (step SA11). This still image moving image determination process will be described later.

  Then, it is determined whether or not the result of the determination in step SA11 is a still image (step SA12). If it is a still image, a calculation process for attenuating the difference value as noise is executed (step SA13). That is, if there is no noise for a still image, the difference value in each successive frame should be “0”. Therefore, if the difference value is calculated for a still image, the difference value is a noise component. It is none other than. Therefore, a calculation process for attenuating the difference value calculated in step SA2 is performed on the target image data.

  Next, the optimum process, that is, the optimum process is performed for each still image and moving image (step SA14), and projection is performed. That is, as disclosed in Japanese Patent Laid-Open No. 2004-32207, projection is performed with gradation correction and the like.

  At this time, as described above, the still image moving image determination is performed with the number of frames corresponding to the difference value between the preceding and succeeding frames, so that the determination accuracy of the still image moving image determination can be improved. Therefore, it is possible to accurately determine a still image and a moving image, and as a result, it is possible to perform projection by appropriately performing optimum processing according to the still image and the moving image.

  4, 6, and 7 are flowcharts showing a subroutine of still image moving image determination processing with the number of frames set in step SA <b> 11.

  In the still image moving image determination process (1) in FIG. 4, the difference value between adjacent frames is calculated (step S111), and the calculated difference value is stored in the RAM 112 (step S112). Next, it is determined whether or not the above processing has been executed for the number of set frames (step S113), and the processing of steps S111 to S113 is repeated until the processing for the number of set frames is completed.

  Therefore, if the process of step SA9 is executed and “5 frames” is set, as shown in FIG. 5A, steps S111 to S113 are repeated four times to obtain the difference values S1, S2, S3. , S4 are respectively calculated.

  In step S114 following step S113, the average value of these difference values S1, S2, S3, and S4 is calculated. Subsequently, it is determined whether or not the calculated average value is equal to or smaller than a predetermined value (step S115). If the average value is equal to or smaller than the predetermined value, it is determined as a still image (step S116). It determines with a moving image (step S117).

  That is, in the case of a moving image, the images are basically different in adjacent frames. Therefore, as shown in FIG. 5B, the obtained difference value can be estimated to be high on average. On the other hand, in the case of a still image, since the images are the same in adjacent frames, the difference value is caused by noise. As shown in FIG. It can be estimated to be low. Therefore, the determination can be made with high accuracy by performing still image / moving image determination based on the average value of the difference values.

  In the still image moving image determination process (2) of FIG. 6, the processes of S121 to S123 are the same as the processes of steps S111 to S123 in the flowchart of FIG. Therefore, if the process of step SA9 is executed and “5 frames” is set, as shown in FIG. 5A, steps S121 to S123 are repeated four times to obtain the difference values S1, S2, S3. , S4 are respectively calculated.

  Then, in step S124 following step S123, it is determined whether or not the difference among the difference values S1, S2, S3, and S4 is greater than or equal to a predetermined value (step S124). Is determined to be a still image (step S125), and if it is less than the predetermined value, that is, if there is little variation, it is determined to be a moving image (step S126).

  That is, in the case of a moving image, since the images are basically different little by little in adjacent frames, it is estimated that the difference value is relatively stable and has little variation as shown in FIG. be able to. On the other hand, in the case of still images, the images are the same in adjacent frames, and the difference value is caused by noise that occurs unspecifically, so there is no place where there is noise between adjacent frames. However, it can be estimated that the variation of the difference value increases. Therefore, a still image and a moving image can be accurately identified by performing still image / moving image determination based on the variation in the difference value.

  In the still image moving image determination process (3) in FIG. 7, a difference value from the first frame is calculated (step S131), and the calculated difference value is stored in the RAM 112 (step S132). Next, it is determined whether or not the above process has been executed up to the set number of frames (step S133), and the processes of steps S131 to S133 are repeated until the set number of frames has been processed.

  Therefore, if the processing of step SA9 is executed and “5 frames” is set, as shown in FIG. 8A, steps S131 to S133 are repeated four times, and difference values T1, T2, T3 are repeated. , T4 are calculated respectively.

  Then, in step S134 following step S133, it is determined whether or not these difference values T1, T2, T3, T4 increase each time the frame is followed (step S134). If it does not increase every time it follows a frame, it is determined as a still image (step S135), and if it increases every time it follows a frame, it is determined as a moving image (step S136).

  That is, in the case of a moving image, the images are basically different each time a frame is passed. Therefore, as shown in FIG. 8B, the difference value with respect to frame 1 increases with each frame. Can be estimated. On the other hand, in the case of a still image, since the images are the same in adjacent frames, the difference value is caused by noise. As shown in FIG. Therefore, it can be estimated that the difference value with respect to the frame 1 does not increase every time the frame is followed. Therefore, it is possible to perform the determination with high accuracy by performing the still image / moving image determination based on whether or not the difference value with respect to the frame 1 increases each time the frame is followed.

  In this embodiment, as shown in the level setting table LT of FIG. 2, the number of set frames is “3” to “6”, and the minimum number of frames is “3”. This is because, in the process of step SA2, if the number of frames is “2”, the difference value has already been calculated, so that the number of frames is set to “2” again and the difference value is not calculated in step SA11. Because it is a meaning. Therefore, by setting the minimum number of frames to “3”, the number of frames according to the level can be made meaningful. Of course, the number of frames is an example, and a larger number of frames may be used.

(Modification of the first embodiment)
FIG. 9 is a flowchart showing a modification of the first embodiment. In this flowchart, steps SA1 to SA14 are the same processing as in the flowchart of FIG. However, in this modification, in step SA201 following step SA2, it is determined whether or not the difference value calculated in step SA2 is equal to or smaller than a predetermined value. If the difference value is equal to or smaller than the predetermined value, the image is determined to be a still image (step SA202), and the process proceeds to step SA14 without performing the above-described steps SA3 to SA13.

  This modification assumes a case where the difference value calculated in step SA2 is clearly smaller than a general difference value based on a moving image. If there is almost no state, there is almost no difference between the previous and next frames, and the difference value between the frames is a minute value. Accordingly, in this case, it is determined that the image is a still image at the time of step SA201 without performing the processing of steps SA3 to SA13, and the process proceeds to step SA14 to execute processing optimal for the still image.

  Therefore, according to this modification, when a still image is projected in a state where there is little disturbance due to noise, the processing load of the control unit 11 can be reduced by not executing the processing of unnecessary steps SA3 to SA13. it can.

  Note that, in the modification of the first embodiment, even if the input signal is a still image without any noise, the difference calculated in step SA2 due to various factors such as the external environment and the state of the device. Since there is almost no case where the value is completely “0” and a small difference value is actually detected, a more realistic moving image still image determination is made by determining that a predetermined value or less is a still image. Can be defeated.

(Second Embodiment)
In the second embodiment of the present invention, a waveform data table WT is stored in the ROM 111 as shown in FIG. The waveform data table WT stores the sync signal waveform corresponding to various standard names of image data input from the input / output connector section 16 such as “analog RGB”.

  FIG. 11 is a flowchart showing the main part of the processing procedure in the present embodiment. That is, image data supplied to the input / output connector unit 16 at a frame rate in accordance with the standard of the image data supplied from a personal computer or the like, or image data read out from the memory card 24 at a frame rate in accordance with the standard. Input (step SB1).

  Next, the standard of this input signal is identified (step SB2). When identifying the standard of the input signal, the waveform of the sync signal in the input signal is compared with the sync signal waveform stored in the waveform data table WT, and the standard name of the standard corresponding to the closest sync signal is selected. It may be identified as the signal standard of the image data, may be identified by the standard input by the user at the key / indicator unit 25, or if its standard information is added to the input signal. You may identify based on it.

  Subsequently, the sync signal waveform of the identified standard is read from the waveform data table WT (step SB3) and compared with the sync signal waveform of the input signal (step SB4). Then, the difference value is leveled as the waveform deterioration degree (step SB5). This leveling may be performed using the level setting table LT shown in FIG. 2 as in the first embodiment.

  Therefore, by performing processing subsequent to step SA4 in the flowchart shown in FIG. 3 subsequent to step SB5, the determination accuracy of still images and moving images can be similarly increased, and appropriate for the still images and moving images. It can be processed and projected.

  In the second embodiment, since the sync signal that is a standard signal is used, it is clear that the difference value is caused by noise. Therefore, the number of frames used for still image moving image determination can be appropriately determined according to the magnitude of the influence of noise.

It should be noted that both the difference value between the sync signal waveform of the standard used in the second embodiment and the sync signal waveform of the input signal and the difference value between the previous and subsequent frames used in the first embodiment are used. It is also possible to make the level comprehensively. As a result, still image moving image determination can be performed with a more appropriate level and a more appropriate number of frames.

1 is a block diagram showing a circuit configuration of a projector according to an embodiment of the present invention. It is a conceptual diagram which shows a level setting table. It is a flowchart which shows the process sequence in the 1st Embodiment of this invention. It is a flowchart which shows the process sequence of still image moving image determination (1). It is explanatory drawing corresponding to still image moving image determination (1) and (2). It is a flowchart which shows the process sequence of still image moving image determination (2). It is a flowchart which shows the process sequence of a still image moving image determination (3). It is explanatory drawing corresponding to still image moving image determination (3). It is a flowchart which shows the process sequence in the modification of the 1st Embodiment of this invention. It is a conceptual diagram which shows a waveform data table. It is a flowchart which shows the process sequence in the 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Projector 11 Control part 12 Input / output interface 13 Image conversion part 14 Display encoder 15 Display drive part 16 Input / output connector part 17 System bus 18 Video RAM
DESCRIPTION OF SYMBOLS 19 Display element 20 Light source device 21 Movable lens group 23 Image compression / expansion part 24 Memory card 25 Key / indicator part 111 ROM
112 RAM
LT level setting table WT waveform data table

Claims (10)

In a projection apparatus that sequentially captures image data in units of frames, performs still image moving image determination on the captured image data, and executes processing according to the determination result,
Detecting means for detecting the state of the captured image data;
Setting means for variably setting the number of frames according to the state detected by the detection means;
Still image moving image determination means for executing the still image moving image determination based on the image data of the number of frames set by the setting means;
A projection apparatus comprising: The detection means includes
A calculation means for calculating a difference value between adjacent front and rear frames sequentially captured;
Determination means for determining the state of the image data based on the difference value calculated by the calculation means;
The projection apparatus according to claim 1, wherein the setting unit sets the number of frames according to the state of the image data determined by the determination unit. The detection means includes
Standard information detection means for detecting different standard information for each standard of the image data included in the captured frame;
A calculation means for calculating a difference value between the standard information and the pre-stored standard information by the standard information detection means;
Determination means for determining the state of the image data based on the difference value calculated by the calculation means;
The projection apparatus according to claim 1, wherein the setting unit sets the number of frames according to the state of the image data determined by the determination unit. The determination means includes storage means for storing the state corresponding to the difference value;
Reading means for reading a state corresponding to the difference value from the storage means;
The projection apparatus according to claim 2, further comprising: The determination unit determines which of the plurality of levels the difference value calculated by the calculation unit belongs to, and provides the level determination result to the setting unit as the state of the image data,
The projection apparatus according to claim 2, wherein the setting unit sets the number of frames according to the level determination result. Determining means for determining whether or not the difference value calculated by the calculating means is equal to or less than a predetermined value;
If it is determined by the determination means that the difference value is equal to or smaller than a predetermined value, it is determined that the image is a still image, and the processing according to the determination result is performed without operating the setting means and the still image moving image determination means. The projection apparatus according to claim 2, further comprising processing means for executing   The said still image moving image determination means performs the said still image moving image determination based on the difference value between adjacent frames in the number of frames set by the setting means. The projection device described.   7. The still image / moving image determination unit performs the still image / moving image determination based on a difference value between a first frame and other frames in the number of frames set by the setting unit. Any one of projection apparatus. A computer having a projection device that sequentially captures image data in units of frames, performs still image moving image determination on the captured image data, and executes processing according to the determination result,
Detecting means for detecting the state of the captured image data;
Setting means for variably setting the number of frames according to the state detected by the detection means;
Still image moving image determination means for executing the still image moving image determination based on the image data of the number of frames set by the setting means;
Projection control program characterized in that it functions as a computer program. A still image moving image determination method in a projection device that sequentially captures image data in units of frames, executes still image moving image determination on the acquired image data, and executes processing according to the determination result,
A detection step of detecting the state of the captured image data;
A setting step for variably setting the number of frames according to the state detected by the detection step;
A still image moving image determination step for executing the still image moving image determination based on the image data of the number of frames set in the setting step;
A still image moving image determination method comprising:

Images