JP2019195130A - Projection apparatus, control method of the same, and program - Google Patents

Abstract

To provide a projection apparatus that makes it possible to achieve both jaggy suppression and sharpness improvement.SOLUTION: A projection apparatus 100 includes: a light source unit 112 for emitting light; a modulation element for outputting a projected image by modulating the light emitted from the light source with predetermined resolution; a pixel moving unit 110 for moving a projection position on a projection surface of a projected image; a control unit 150 for controlling the modulation element and the pixel moving unit 110 on the basis of an input frame; and an acquisition unit 105 for acquiring parameters relating to a pixel size of the projected image on the projection surface. When the size of the pixel of the projected image is equal to or greater than a predetermined value, the control unit 150 controls the pixel moving unit 110 to move the projection position, otherwise, controls so that the pixel moving unit 110 does not move the projection position.SELECTED DRAWING: Figure 1

Description

  The present invention relates to video projection technology.

  In recent years, image display devices that display higher resolution images have been widely used. Among high-resolution images, for example, an image of 3840 pixels in the horizontal direction × 2160 pixels in the vertical direction is generally called a “4K image”. In addition, development of a super high-definition display system having 8K resolution (horizontal 7680 pixels × vertical 4320 pixels) is also progressing, and the resolution of video content is also increasing. With this trend, the development of 8K resolution display devices is also progressing in parallel with the development of 4K resolution display devices.

  In Patent Document 1, an image is displayed at a resolution higher than the resolution of the light modulation element by moving the position of the image modulated by the light modulation element that modulates light at a certain resolution on the screen. A projector (projection apparatus) that can give a sense of resolution to a user is disclosed.

JP 2011-203460 A

  However, in the projection apparatus disclosed in Patent Document 1, an increase in resolution gives the user the impression that the edges of the image are blurred while improving the smoothness between the pixels in the image. is there.

  SUMMARY An advantage of some aspects of the invention is that it provides a projection apparatus capable of both suppressing jaggies and improving sharpness.

  In order to solve this problem, for example, a projection apparatus according to the present invention includes a light source that emits light, a modulation element that modulates light emitted from the light source at a predetermined resolution and outputs a projection image, and projection of the projection image. A moving unit that moves a projection position on a plane; a control unit that controls the modulation element and the moving unit based on an input frame; and a parameter relating to a pixel size of the projection image on the projection plane Acquisition means, and the control means controls the moving means to move the projection position when the pixel size of the projection image is a predetermined value or more, and otherwise, the control means The moving unit is controlled so as not to move the projection position.

  According to the present invention, both jaggies can be suppressed and sharpness can be improved as compared with conventional projection apparatuses.

1 is a configuration diagram of an image processing system according to a first embodiment. It is a figure which shows the display positional relationship of the divided image based on 1st Embodiment. It is a figure which shows the projection surface information acquisition method based on 1st Embodiment. It is a figure which shows the pixel size with respect to the same projection surface size based on 1st Embodiment. It is a figure which shows the pixel size with respect to different projection surface sizes based on 1st Embodiment. It is a figure which shows the relationship between a jaggy feeling and a sharp feeling based on 1st Embodiment. It is a block diagram of the image processing system based on 2nd Embodiment. It is a figure which shows an example of the histogram calculation based on 2nd Embodiment. It is a figure which shows the low gradation frequency calculation flow based on 2nd Embodiment. It is a figure which shows the high gradation frequency calculation flow based on 2nd Embodiment. It is a block diagram of the image processing system based on 3rd Embodiment. It is a block diagram of the image processing system based on 4th Embodiment. It is a figure which shows the viewing distance calculation method based on 4th Embodiment. It is a block diagram of the image processing system based on 5th Embodiment. It is a figure which shows an example of pixel shift control degree calculation based on 5th Embodiment. It is a figure which shows an example of interpolation phase PHASE calculation based on 5th Embodiment. It is a figure which shows the interpolation method based on 5th Embodiment. It is a block diagram of the image processing system based on 6th Embodiment. It is a figure which shows the display positional relationship of the divided image based on 6th Embodiment. It is a flowchart which shows the process sequence of the control part which concerns on 1st Embodiment.

  Hereinafter, embodiments according to the present invention will be described in detail with reference to the accompanying drawings. In addition, the structure in embodiment shown below is only an example, and this invention is not limited to the structure shown in figure.

[First Embodiment]
The projection apparatus 100 according to the present embodiment is a projector that projects an image based on an input video Vi in which a plurality of frames are switched at an input frame frequency (frame rate) onto a projection surface (projection screen). The projection apparatus 100 includes a light source that emits light, a modulation element that modulates light emitted from the light source and outputs an image with a predetermined resolution, and a projection surface of each pixel (projection pixel) of the image output from the modulation element. A pixel moving unit for moving the upper position is provided. The projection apparatus 100 projects the image at a predetermined resolution on the projection plane while shifting the projection position, so that the user who views the image can feel a resolution higher than the image with the predetermined resolution on the projection plane. It is what.

  FIG. 1 is a block diagram of a projection apparatus 100 according to the first embodiment. The projection apparatus 100 includes a synchronization signal output unit 101, a generation unit 102, a selection unit 103, an acquisition unit 105, a storage unit 106, a determination unit 107, a panel control unit 108, a panel unit 109, a pixel moving unit 110, a light source control unit 111, The light source unit 112 and the control unit 150 that controls each processing unit of the projection apparatus 100 are included.

  Here, the control unit 150 includes a CPU (or processor), a ROM storing a program executed by the CPU, and a RAM used as a work area of the CPU. Further, a part of the processing unit described below may be realized by the control unit 150 executing a program.

  The panel control unit 108 generates a voltage signal PD for modulating the pixel unit transmittance of the panel unit 109 based on the subframe image (details will be described later) from the selection unit 103.

  The panel unit 109 transmits light emitted from the light source 112 at a transmittance based on the voltage signal PD input from the panel control unit 108, and is configured by, for example, a transmissive liquid crystal device. The resolution of the panel unit 109 is assumed to be the panel resolution PRESO.

  The pixel moving unit 110 can set switching of the direction in which the light modulated by the panel unit 109 is emitted based on a signal FLG (described later in detail) from the determination unit 107. Specifically, when the signal FLG is “0”, the pixel moving unit 110 fixes the direction in which the light modulated by the panel unit 109 is emitted to a preset first direction. When the signal FLG is “1”, the pixel moving unit 110 is modulated by the panel unit 109 in accordance with a signal supplied from the synchronization signal output unit 101 (details will be described later, but a synchronization signal of 120 Hz in the embodiment). The direction in which light is emitted is switched between the first direction and the second direction. As a result, the pixels of the image projected on the projection screen move at a cycle of 120 Hz. Hereinafter, the movement of the projection pixel is expressed as “pixel shift”. Note that the principle of changing the direction of the emitted light includes a method of using light refraction by the rotation driving of the glass plate and a reflection of light by the rotation driving of the mirror plate. .

  Note that the position of the light emitted in the second direction on the projection plane of light emitted in the first direction is shifted by half a pixel in the horizontal direction and the vertical direction. Here, the “pixel” is a projection pixel in a projection image projected on the projection plane when pixel shifting is not performed. The projected image is an image having a panel resolution PRESO.

  By performing pixel shifting, the first projected image with the panel resolution PRESO emitted in the first direction and the second projected image with the panel resolution PRESO emitted in the second direction are alternately displayed on the projection plane. Is projected onto the screen. A user viewing the projection image on the projection surface recognizes an image in which the first projection image and the second projection image are integrated over time. By recognizing images shifted by half a pixel alternately, the user recognizes that an image having a panel resolution PRESO or higher is projected in a pseudo manner.

  The light source control unit 111 transmits a control signal CON to the light source unit 112 based on a subframe image SELD (details will be described later) from the selection unit 103 or user designation via an operation input unit (not shown), and the light source unit 112 is turned on / off, and the amount of light is controlled. For example, the light source control unit 111 obtains a control signal CON for obtaining the degree of lightness and darkness of the image from the average value of the luminance values of all the pixels in the image indicated by the subframe image SELD and increasing the amount of light if the image is dark. It is generated and supplied to the light source 112.

  The light source 112 is a halogen lamp, a xenon lamp, a high-pressure mercury lamp, or the like, which emits light with a light amount based on the control value CON and irradiates the light toward the panel unit 109.

  The synchronization signal output unit 101 outputs the timing signal TSIG according to the synchronization signal SYNC synchronized with the frame period of the input video Vi, and outputs control signals for the selection unit 103, the panel unit 109, and the pixel moving unit 110. The synchronization signal SYNC includes a horizontal synchronization signal HSYNC and a vertical synchronization signal VSYNC. As the timing signal TSIG in the present embodiment, a control signal having a frame rate twice that of the input video Vi is generated using the vertical synchronization signal VSYNC synchronized with the input frame frequency. For example, for a 60 Hz input video Vi, a 120 Hz timing signal TSIG is generated. That is, the selection unit 103, the panel unit 109, and the pixel moving unit 110 are controlled to be driven at a frame rate that is twice the input frame frequency by the timing signal TSIG. As a result, switching control at 120 Hz is performed for the three blocks with respect to an input image of 60 Hz.

  The generation unit 102 generates two subframe images DIV1 and DIV2 from one frame image of the input video Vi input at 60 Hz. For example, it is assumed that the input video Vi is input in a serial transmission format. In this case, the generation unit 102 repeatedly separates the odd-numbered pixel data and the even-numbered pixel data of the image indicated by one frame of the video Vi, and the image signal formed by the odd-numbered pixel data is subframed. An image signal formed by the image DIV1 and even-numbered pixel data is generated as a sub-frame image DIV2. As a result, the sub-frame images DIV1 and DIV2 are images having a resolution half that of the one-frame image represented by the input video Vi. The source of the input video Vi is not limited, but is an information processing apparatus such as a personal computer. Further, the input video Vi is assumed to be digital data. However, in the case of an analog signal, it may be input via an A / D converter. Therefore, the signal form of the input video Vi is not particularly limited to digital / analog. .

  The selection unit 103 alternately selects the two subframe images DIV1 and DIV2 generated by the generation unit 102 in accordance with the timing signal TSIG (120 Hz signal in the embodiment) supplied from the synchronization signal output unit 101. Then, the selection unit 103 supplies the selected subframe image to the panel control unit 108 and the light source control unit 111 as a subframe image SELD (any one of the subframe images DIV1 and DIV2). That is, when the input video Vi is 60 frames / second (60 Hz), the selection unit 103 reads the subframe image SELD (either DIV1 or DIV2) at 120 frames / second (120 Hz).

  The acquisition unit 105 calculates the pixel size GSISE of the image projected on the projection plane as a pixel size parameter. Therefore, the acquisition unit 105 first acquires information TINFO regarding the projection plane. The information TINFO relating to the projection plane is information indicating the size of the projection image on the projection plane. The acquisition unit 105 includes a sensor for acquiring a distance (projection distance) between the projection plane and the projection apparatus 100. For example, the acquisition unit 105 includes a distance measuring sensor that uses infrared light. Then, the acquisition unit 105 detects the distance (projection distance) between the projection device 100 and the projection surface (or projection screen) using the distance measuring sensor or the like. Then, the acquisition unit 105 obtains information TINFO by calculating the lengths of the horizontal and vertical sides of the projection area from the detected projection distance.

  FIG. 3 schematically shows the relationship between the projection distance 201 and the length of the horizontal side of the projection area 200. In FIG. 3, the acquisition unit 105 calculates the length of the horizontal side of the projection area 200 from the projection distance 201 detected by the distance measuring sensor and the horizontal field angle 202 of the projection optical system 205 using a trigonometric function. In FIG. 3, the acquisition unit 105 calculates the projection area 201 based on the similar relationship between the projection distance 201, the horizontal side length 203 of the liquid crystal panel 206 included in the panel unit 109, and the focal length 204 of the projection optical system 205. The length of 200 horizontal sides may be calculated. Note that the horizontal side length 203 of the liquid crystal panel 206 and the focal length 204 of the projection optical system 205 are both known. Further, the length of the side in the vertical direction of the projection area 200 can be similarly calculated. The projection distance 201 may be directly input by the user from an operation unit (not shown).

  The acquisition unit 105 calculates the projection pixel size GSIZE from the information TINFO relating to the size of the projection area 200 calculated as described above and the panel resolution PRESO stored in the storage unit 106. The panel resolution PRESO is defined by the number of pixels PRESO_H in the horizontal direction and the number of pixels PRESO_V in the vertical direction. For example, in the case of a display panel having 4K resolution, the number of pixels PRESO_H = 3840 in the horizontal direction and the number of pixels PRESO_V = 2160 in the vertical direction. The projected pixel size is the length of the horizontal and vertical sides per projected pixel. The length of the horizontal side can be calculated by dividing the horizontal length of the projection area 200 calculated by the projection plane information acquisition unit 105 by the number of horizontal pixels PRESO_H of the liquid crystal panel 206. Further, the length of the side in the vertical direction can be calculated by dividing the length in the vertical direction of the projection area 200 calculated by the projection plane information acquisition unit 105 by the number of vertical pixels PRESO_V of the liquid crystal panel 206. it can. The acquisition unit 105 supplies the projection pixel size GSIZE obtained as described above to the determination unit 107.

  In the above description, the size of one projection pixel is calculated for the projection area 200. However, the projection pixel size may be calculated for each pixel included in the projection area 200. This is because the size of the projection pixel may not be uniform within the projection area 200, such as when the projection apparatus 100 is not installed in front of the projection plane. In this case, the projection device 100 projects a preset pattern (pattern for specifying four corners) on the projection unit 200 on the panel unit 109, and measures the distances to the positions of the upper, lower, left and right ends (four corners). The lengths of the upper side, the lower side, the left side, and the right side are calculated from the similarity relationship shown in FIG. Next, by dividing these by the number of horizontal pixels or the number of vertical pixels, the sizes of the upper end, lower end, left end, and right end pixels of the projection area are calculated. Finally, the size of the pixels other than the end portion is calculated by performing an interpolation operation using the size of the end portion pixel according to the distance of the pixel from the end portion. By calculating as described above, the projection pixel size can be calculated for each pixel. For simplification of processing, the projection pixel size GSIZE may be calculated for each partial region in which a plurality of pixels are collected, not for each pixel.

  The determination unit 107 compares the projection pixel size GSIZE supplied from the acquisition unit 105 with a predetermined value, determines whether or not to perform pixel shift control, and sets the determination result as a signal FLG to the image moving unit 110. Output to. Specifically, the determination unit 107 compares the projection pixel size GSIZE with a predetermined threshold value TH, and if GSIZE <TH, a signal FLG (= “0” indicating “no pixel shift control” is performed. ”) Is output. On the other hand, when the projection pixel size GSIZE is equal to or larger than the predetermined threshold TH (GSIZE ≧ TH), the determination unit 107 outputs a signal FLG (= “1”) indicating “perform pixel shift control”. When the threshold value TH is set to a large value, tuning is performed in a direction in which pixel shift control is not performed. Conversely, when the threshold value TH is decreased, tuning is performed in a direction in which pixel shift control is performed. About the value of threshold TH, a user should just set arbitrarily according to the specification of a product.

  Now, the pixel moving unit 110 receives the signal FLG from the determination unit 107 as described above. When the signal FLG from the determination unit 107 is “0”, the pixel moving unit 110 does not perform pixel shifting. That is, the pixels at the same position in each of the sub-frame images DIV1, DIV2 are projected at the same position on the projection plane. When the signal FLG from the determination unit 107 is “1”, the pixel moving unit 110 displays an image projected every other subframe (120 Hz in the embodiment) with respect to the voltage signal PA output from the panel unit 109. In this case, the image is projected with a shift of 0.5 pixels in both the horizontal and vertical directions. FIG. 2 shows the projection positions of two subframe images DIV projected in succession. As illustrated, the sub-frame image DIV2 is projected with a shift of 0.5 pixels in both the horizontal and vertical directions with respect to the sub-frame image DIV1. Since the human eye synthesizes this temporally, it is perceived with a higher resolution than that of the panel unit 109.

  The outline of the processing has been described above. Next, the user merit by changing the pixel shift control according to the projection pixel size calculated from the projection size in the present embodiment will be described.

  FIG. 4A shows projection by the projection apparatus 100a having a high resolution panel, and FIG. 4B shows projection by the projection apparatus 100b having a low resolution panel. The size of the projection area 200 is the same.

  As can be seen from the drawing, in the case of the projection area 200 having the same size, the projection pixel size GSIZE in the projection image by the projection device 100b having a low panel resolution is larger than that of the projection device 100a having a high panel resolution. That is, the projected image displayed by the projection apparatus 100b feels more lattice. The lattice feeling can be said to be a step between the projected pixels and a resolution feeling. For example, assume that a smooth line is drawn in the image signal. The line in the projection image displayed by the projection apparatus 100b is less smooth (raised) due to the influence of the projection pixels than the line in the projection image displayed by the projection apparatus 100a. The feeling that the user learns as a result of viewing such an image is also called a jaggy feeling. That is, the larger the projection pixel, the higher the jaggy feeling. Conversely, the smaller the projection pixel, the lower the jaggy feeling and the smoother the image is expressed. Therefore, sharpness is improved.

  Next, an example in which the projection size of the projection device 100a having a high resolution panel is increased and the projection size of the projection device 100b having a low resolution panel is reduced will be described with reference to FIGS. As can be seen from FIGS. 5A and 5B, the projection apparatus 100a has a higher panel resolution, but focusing on the projection pixel size GSIZE, the projection apparatus having a lower panel resolution than the projection apparatus 100a having a higher panel resolution. 100b is smaller. That is, it can be said that the projection apparatus 100a having a higher panel resolution feels a lattice feeling, and as a result, the jaggy feeling becomes higher.

  In general, the jaggy feeling and sharpness are greatly influenced by the projection pixel size. As shown in FIG. 6, in general, as the projection pixel size increases, the jaggy feeling increases and, conversely, the sharpness decreases. This is because the grid feeling increases as the projection pixel size increases.

  In the projection apparatus 100 of the present embodiment, it is assumed that the image projected on the projection plane when pixel shifting is not performed is the projection image shown in FIG. At this time, it is assumed that the projection pixel size GSIZE obtained by the acquisition unit 104 is equal to or larger than the threshold value TH. In this case, the projection apparatus 100 according to the present embodiment turns on pixel shift control (FLG = 1) and executes pixel shift. FIG. 4A shows an image projected on the projection plane when the projection apparatus 100 performs pixel shifting.

  Further, an image projected on a projection plane closer to the projection apparatus 100 than the projection plane shown in FIG. 4B without the pixel shift of the projection apparatus 100 of the present embodiment is the projection shown in FIG. 5B. Suppose that it is an image. In this case, the projection pixel size GSIZE becomes equal to or greater than the threshold value TH as the projection plane approaches. Therefore, pixel shift is not executed.

  While pixel shifting has the effect of improving the resolution of the image, it may give the user the impression that the image is blurred by displaying a plurality of projected images whose projection positions are shifted in time. . When the sharpness of the projected image projected at the panel resolution PRESO is low (the projection pixel GSIZE is equal to or greater than the threshold value), the projection apparatus 100 according to the present embodiment performs control to improve the sharpness by pixel shift control. On the other hand, when the sharpness of the projected image projected at the panel resolution PRESO is high (projection pixel GSIZE is less than the threshold value TH), the projection apparatus 100 shifts the pixel rather than further improving the sharpness by the pixel shift control. Priority is given to suppressing the effect of blurring of the image by the control. Therefore, pixel shift is not executed. Thereby, it is a projection apparatus which can perform pixel shift control, and it is possible to obtain the effect of improving the resolution by suitably shifting the pixels and to suppress the occurrence of blurring.

  Although it is above, the process sequence of the control part 150 in embodiment is demonstrated with reference to the flowchart of FIG. This process is started when the user determines the installation position of the projection apparatus 100 with respect to the projection plane (projection panel or projection screen) and receives an instruction input indicating the installation position determination by the user.

  First, in S1, the control unit 150 controls the acquisition unit 105 to acquire the distance to the projection plane. Next, in S <b> 2, the control unit 150 controls the acquisition unit 105 to calculate the projection pixel size GSIZE based on the acquired distance. In step S3, the control unit 150 controls the determination unit 107 to compare the projection pixel size GSIZE with the threshold value TH. When GSIZE ≧ TH, the control unit 150 causes the determination unit 107 to output an FLG signal having a value of “1” in S4. On the other hand, if GSIZE <TH, the control unit 150 causes the determination unit 107 to output an FLG signal having a value of “0” in S5. In step S6, the control unit 150 causes the pixel moving unit 110 to turn on / off the pixel shift driving according to the value of the signal FLG.

  In the control method according to the present embodiment, when the projection pixel size GSIZE is equal to or larger than a predetermined threshold, pixel shift control is performed in order to reduce jaggy. In this case, the jaggy reduction process is prioritized because the disturbance to the jaggy feeling associated with the lattice feeling is greater than the disturbance to the sharpness of the projected image. On the contrary, when the projection pixel size GSIZE is smaller than the predetermined threshold value, the jaggy feeling does not matter, so the sharpness is prioritized and the pixel shift control is not performed.

  In the present embodiment, an example in which the degree of pixel shift is automatically controlled according to the projection pixel size has been described, but the present invention is not limited to this. For example, when the projection pixel size is reduced, the user may be prompted to turn off pixel shift control. In such a case, the user may be notified using the OSD, and the user may be prompted to perform an operation using a GUI or the like.

  In the present embodiment, whether or not to perform pixel shift is controlled according to the projection pixel size GSIZE. However, whether or not to perform pixel shift according to the distance between the projection apparatus 100 and the projection plane is determined. Control may be performed. As described above, when the angle with respect to the projection plane is within a predetermined range, the projection pixel size GSIZE on the projection plane is roughly determined by the distance between the projection device 100 and the projection plane. Therefore, without obtaining the projection pixel size GSIZE, control may be performed so that pixel shift is not executed when the distance between the projection apparatus 100 and the projection plane is equal to or less than the distance threshold. The case where the distance between the projection apparatus 100 and the projection surface is equal to or smaller than the distance threshold corresponds to the case where the projection pixel size GSIZE is smaller than the threshold TH.

  When the distance between the projection device 100 and the projection surface is longer than the distance threshold, the projection device 100 executes pixel shifting. Further, when the distance between the projection apparatus 100 and the projection plane is longer than the distance threshold, the user may set in advance whether or not the projection apparatus 100 executes pixel shift.

  As described above, according to the present embodiment, an image projection apparatus that simultaneously suppresses jaggies and improves sharpness is provided by adaptively controlling the pixel shift effect according to the projection pixel size of the display image. It becomes possible.

[Second Embodiment]
In the first embodiment, an example in which the pixel shift effect is adaptively controlled according to the projection pixel size of the display image has been shown. However, in the second embodiment, the calculation is performed according to the projection pixel size of the display image. An example in which the degree of pixel shift is corrected according to the feature amount of the input image is shown. Hereinafter, configurations and processes different from those of the first embodiment will be described in detail, and descriptions of configurations and processes similar to those of the first embodiment will be omitted.

  FIG. 7 shows a configuration diagram of an image processing system according to the second embodiment. The feature amount acquisition unit 220 extracts a feature amount STAT of an image of one frame indicated by the input video Vi. The feature amount acquisition unit 220 in the present embodiment extracts a luminance histogram of an image of one frame indicated by the input video Vi as a feature amount STAT. When the luminance is represented by 8 bits, the range of luminance values that can be taken is 0 to 255. Therefore, if the number of pixels (frequency) with luminance “0” is expressed as YH (0), the feature amount acquisition unit 220 acquires YH (0), YH (1),..., YH (255). it can. Hereinafter, {YH (0), YH (1),..., YH (255)} is simply referred to as a luminance histogram YH.

  FIGS. 8A and 8B show examples of luminance histograms. The horizontal axis indicates luminance, and the vertical axis indicates the number of pixels. FIG. 8A is an example of a luminance histogram of an image having a wide dynamic range, and FIG. 8B is an example of a luminance histogram of an image having a narrow dynamic range. In the luminance histograms of FIGS. 8A and 8B, the frequency of a pixel having a lower luminance value toward the left side and a higher luminance value toward the right side is represented. That is, FIG. 8A shows an example of an image widely distributed from a pixel with low luminance to a pixel with high luminance. On the other hand, FIG. 8B shows an example of an image in which the number of pixels with low luminance and pixels with high luminance is small and the luminance values are distributed in the middle vicinity.

  The feature amount acquisition unit 220 supplies the luminance histogram YH calculated as described above to the correction unit 221 as the feature amount STAT.

  The correcting unit 221 corrects the control signal FLG output from the determining unit 107 according to the luminance histogram YH acquired by the feature amount acquiring unit 220, and outputs the correction result to the pixel moving unit 110 as a signal REV_FLG. The pixel moving unit 110 does not perform pixel shifting when the received signal REV_FLG is “0”. Further, the pixel moving unit 110 performs pixel shifting when the received signal REV_FLG is “1”. Details of the processing in the correction unit 221 will be described below.

  The correction unit 221 cumulatively adds the frequencies in the direction in which the luminance increases from the lowest luminance “0” in the luminance histogram YH received from the feature amount acquisition unit 220, and the luminance value LOW_Class when the value exceeds the threshold value L Asking. A calculation flow of LOW_Class is shown in FIG. The threshold value L is an arbitrarily set value. The smaller the threshold value L is, the easier it is to calculate the contrast CONT shown below.

  In S101, the correction unit 221 starts low gradation lower limit calculation processing. In S102, the correction unit 221 initializes the variable n and LOW_Value with “0”.

  In S103, correction unit 221 adds YH [n] to LOW_Value, and updates (stores) the value of LOW_Value. In S104, correction unit 221 compares LOW_Value with threshold value L. When LOW_Value is larger than the threshold value L, the determination result correction unit 221 advances the process to S106, determines the luminance value indicated by the variable n at that time as LOW_Class, and ends this process. If LOW_Value is equal to or smaller than the threshold value L, the correction unit 221 adds “1” to the variable n in S105, and returns the process to S103. And the correction | amendment part 221 repeats S103-S105 until determination of S104 becomes Yes.

  The correction unit 221 according to the embodiment accumulates and adds the frequency in the direction in which the luminance decreases in the luminance histogram YH [n], that is, the highest luminance “255”, and calculates a luminance value HIGH_Class whose value exceeds the threshold value H. FIG. 10 shows a calculation flow of HIGH_Class. The threshold value H is an arbitrarily set value. The smaller the threshold value H is, the easier it is to calculate the contrast CONT shown below.

  In S201, the correction unit 221 starts high gradation upper limit calculation processing. In S202, the correction unit 221 initializes the variable n with an initial value “255” and the variable HIGH_Value with “0”.

  In S203, correction unit 221 adds YH [n] to HIGH_Value, and updates (stores) the value of HIGH_Value. In S204, the correction unit 221 compares HIGH_Value with the threshold value H. If HIGH_Value is greater than the threshold value H, the correction unit 221 determines the brightness value of the variable n at that time as HIGH_Class in S206, and ends this processing. If HIGH_Value is equal to or smaller than the threshold value H, the correction unit 221 subtracts “1” from the variable n in step S205 and returns the process to 203. And the correction | amendment part 221 repeats S203-S205 until determination of S204 becomes Yes.

  Next, the correction unit 221 acquires the contrast CONT. The contrast CONT is assumed to be an absolute value of a difference between LOW_Class and HIGH_Class.

  The value of the contrast CONT indicates that the larger the value, the wider the dynamic range of the image of the input video Vi, and conversely, the smaller the contrast CONT, the narrower the dynamic range of the image of the input video Vi. That is, it can be said that the contrast CONT is an index value representing the width of the dynamic range. The contrast CONT can also be acquired as a ratio of HIGH_Class to LOW_Class. Also in this case, the larger the value of the contrast CONT, the wider the dynamic range of the input image.

  Next, the correction unit 221 corrects the signal FLG of the determination result in the determination unit 107 according to the contrast CONT calculated as described above. The thresholds TH1 and TH2 shown below are preset values and have a relationship of TH1 ≦ TH2.

  When the contrast CONT is larger than the threshold value TH2, the correction unit 221 corrects the pixel shift. Specifically, when CONT is larger than threshold value TH2, correction unit 221 corrects FLG = 1 even if signal FLG from determination unit 107 is “0”. In addition, when the contrast CONT is smaller than the threshold value TH1, the correction unit 221 performs control so that the pixel shift is not performed. Specifically, when the contrast CONT is smaller than the threshold value TH1, the correction unit 221 corrects FLG = 0 even if the signal FLGFLG from the determination unit 107 is “1”. When the contrast CONT is not less than the threshold value TH1 and not more than the threshold value TH2, the signal FLG from the determination unit 107 is not corrected. In other words, the pixel shift control is more likely to be turned on as TH1 and TH2 are set smaller. Then, the correcting unit 221 supplies the FLG corrected in this way to the pixel moving unit 110 as REV_FLG.

  The reason for performing the correction as described above is that the higher the contrast of the projected image, the clearer the appearance of the object, and the more easily jaggies are visually recognized.

  In the second embodiment, the information indicating whether or not to perform pixel shift based on the projection pixel size is corrected according to the contrast of the image of the input video Vi, but is corrected according to the feature instead of other contrast. May be.

  For example, the correction may be performed according to the type of content of the image of the input video Vi. For example, in the case where the image indicated by the input video Vi is an image in which the boundaries of images such as characters and graphics are clear (for example, an image by a spreadsheet application when a presentation is performed on a personal computer), the direction in which pixel shift is not performed In the case of an image with a gradation such as a natural image, it may be corrected in the direction of pixel shift. In such a case, when a personal computer signal is input, which is preferable to “Dot by Dot”, it is possible to view with the original pixel shape, and when a natural image with a smooth edge is preferable, it is possible to view a display image with reduced jaggy. Is possible.

  In addition, when the type of content of the image of the input video Vi is mixed in one screen (for example, when a picture of a natural image exists in the image of the spreadsheet application when a presentation is performed on a personal computer) ) May be corrected according to the feature with the larger ratio in the screen. If there are a lot of characters or figures in the Excel image, correction is made in the direction in which pixel shift is not performed, and if the display area of a natural picture is large, correction is made in the direction in which pixel shift is performed.

  The feature amount is not limited to this, and may be determined according to the luminance of the image, for example. In this case, the higher the luminance, the more the pixel shift control should be performed.

  Also, the present invention can be applied when the user arbitrarily adjusts contrast and brightness. In this case, the same control as described above may be performed.

  It can also be determined according to a display mode arbitrarily set by the user (a “presentation mode” suitable for a presentation using a PC or a “slide show mode” in which photographs are automatically switched and displayed). In this case, the correction may be performed in a direction in which the pixel shift is not performed in the “presentation mode”, and the correction may be performed in a direction in which the pixel shift is performed in the “slide show mode”. The reason is the same as described above.

  As described above, according to the second embodiment, the information indicating whether or not to perform the pixel shift calculated according to the projection pixel size of the display image is used as the feature amount of the image of the input video Vi. By correcting accordingly, it is possible to provide an image projection apparatus that achieves both jaggy feeling suppression and sharpness improvement.

[Third Embodiment]
In the third embodiment, an example will be described in which information indicating whether or not to perform pixel shift determined according to the projection pixel size of the display image is corrected according to the enlargement ratio of the image. The configuration and processing different from those of the first embodiment will be described in detail, and description of the same configuration and processing as those of the first embodiment will be omitted.

  FIG. 11 is a block diagram of the projection apparatus 100 according to the third embodiment.

  The enlargement factor acquisition unit 320 acquires an enlargement factor when adjusting the image of the input video Vi to the display panel resolution. Specifically, the image of the input video Vi is associated with the panel unit 109 based on the number of horizontal pixels and the number of vertical pixels of the image of the input video Vi and the number of horizontal pixels and vertical pixels of the panel unit 109. The horizontal magnification X and the vertical magnification Y are obtained. Then, the enlargement rate acquisition unit 320 supplies the obtained magnifications X and Y as the enlargement rate RATE (X, Y) to the processing unit 321 and the correction unit 322. When the resolution of the image of the input video Vi and the display panel resolution are the same, RATE (X) = 1 and RATE (Y) = 1, and when the resolution of the image of the input video Vi is lower than the display panel resolution, RATE (X X)> 1, and RATE (Y)> 1. Further, when the resolution of the image of the input video Vi is higher than the display panel resolution, RATE (X) <1 and RATE (Y) <1.

  The processing unit 321 performs an enlargement process so that the image of the input video Vi matches the panel resolution. The enlargement process may use a general method, for example, a bicubic interpolation method that interpolates with reference to horizontal 4 pixels × vertical 4 pixels around the interpolation pixel position, or a super-resolution process that reproduces a high frequency range. For example, the interpolation pixel may be generated.

  The correction unit 322 corrects the signal FLG of the determination result of the determination unit 107 according to the enlargement rate RATE (X, Y) acquired by the enlargement rate acquisition unit 320, and whether or not to perform the pixel shift after the correction. Is output to the pixel moving unit 110 as a signal REV_FLG. For this reason, in the third embodiment, two thresholds TH1 and TH2 for determining the enlargement ratio are provided. Here, TH1 and TH2 have a relationship of TH1 ≦ 1 ≦ TH2, and can be set as appropriate by the user.

  When either one of the horizontal enlargement ratio and the vertical enlargement ratio among the enlargement ratios RATE (X, Y) is greater than TH2, the correction unit 322 has a resolution of the image of the input video Vi with respect to the panel display resolution. If it is smaller, correction is performed so that pixel shifting is not performed. Specifically, when either one of the horizontal enlargement ratio and the vertical enlargement ratio is greater than the threshold value TH2, the correction unit 322 sets REV_FLG = 0 even if the signal FLG from the determination unit 107 is 1. To do.

  Next, the correction unit 322 determines that the resolution of the image of the input video Vi is the panel display resolution when both the horizontal enlargement ratio and the vertical enlargement ratio of the enlargement ratio RATE (X, Y) are smaller than the threshold value TH1. On the other hand, when it is larger, correction is performed so as to shift pixels. Specifically, the correction unit 322 sets REV_FLG = 1 even when both the horizontal enlargement factor and the vertical enlargement factor are smaller than the threshold value TH1 even if the signal FLG from the determination unit 107 is zero.

  Then, the correction unit 322 has either the horizontal enlargement ratio or the vertical enlargement ratio of the enlargement ratio RATE (X, Y) is equal to or greater than the threshold value TH1, and the horizontal enlargement ratio or the vertical enlargement ratio of the enlargement ratio RATE (X, Y). When both are equal to or less than the threshold value TH2, the value of the signal FLG from the determination unit 107 is output as REV_FLG.

  The reason for performing the correction as described above is that when the resolution of the image of the input video Vi is low when the image is displayed on the projection surface through the panel, the image does not originally have a high frequency band. This is because the improvement effect is limited. That is, the characteristic that the possibility that the image has a higher frequency component is higher when the enlargement ratio is smaller is used.

  Also, the present invention can be applied when the user arbitrarily sets an enlargement ratio using a menu or the like. In this case, when the user sets a large enlargement ratio, correction is performed in a direction in which pixel shift control is not performed, and when a small enlargement ratio is set, correction is performed in a direction in which pixel shift is performed.

  As described above, the information indicating whether or not to perform the pixel shift calculated according to the projection pixel size of the display image is corrected according to the enlargement ratio at the time of display, thereby suppressing jaggy feeling and sharpness. It is possible to provide an image projection apparatus that achieves both improved feeling.

[Fourth Embodiment]
The fourth embodiment shows an example in which information indicating whether or not to perform pixel shift determined according to the projection pixel size of the display image is corrected according to the viewing distance of the user. Hereinafter, configurations and processes different from those of the first embodiment will be described in detail, and descriptions of configurations and processes similar to those of the first embodiment will be omitted.

  FIG. 12 is a block diagram of the projection apparatus 100 according to the fourth embodiment.

  The viewing distance acquisition unit 420 acquires the distance between the viewing user and the projection plane, and outputs the distance to the correction unit 421 as viewing distance information DIST.

  FIG. 13 shows the concept of the positional relationship and distance between the projection device 100, the projection image PD, and the viewing user.

The viewing distance information DIST is composed of a sensor such as a camera for acquiring projection plane information and a camera for acquiring a user position, as in the method of acquiring projection plane information in the first embodiment. A distance (projection distance) TDIST between the projection apparatus 100 and the projection plane is acquired using a distance measuring sensor or the like using infrared light. Similarly, the distance (user distance) UDIST between the projection apparatus 100 and the viewer (user) is acquired. From these, the viewing distance DIST is calculated by the following equation (2).
DIST = TDIST + UDIST (1)
Next, the correction unit 421 corrects the signal FLG indicating whether or not to perform the pixel shift output from the determination unit 107 according to the viewing distance DIST calculated by Expression (1). For this reason, also in the fourth embodiment, two threshold values TH1 and TH2 are provided. Here, these threshold values have a relationship of TH1 ≦ TH2, and can be set as appropriate by the user.

  When the viewing distance DIST is smaller than the threshold value TH1, the correction unit 421 corrects the signal FLG from the determination unit 107 so as to shift pixels. Specifically, when the viewing distance DIST is smaller than the threshold value TH1, the correction unit 421 corrects FLG = 1 even if the signal FLG from the determination unit 107 is “0”.

  Next, when the viewing distance DIST is larger than the predetermined threshold value TH2, the correction unit 421 corrects the pixel shift so as not to be performed. Specifically, when the viewing distance DIST is greater than the threshold value TH2, the correction unit 421 corrects FLG = 0 even if the signal FLG from the determination unit 107 is “1”. When the viewing distance DIST is equal to or greater than the threshold value TH1 and equal to or less than the threshold value TH2, the correction unit 421 does not correct the output signal FLAG from the determination unit 107.

  The reason for performing such correction is that the smaller the viewing distance DIST is, the closer the distance between the projection plane and the viewing user is, and thus the relatively smaller display pixel size.

  As described above, the information indicating whether or not to perform the pixel shift calculated according to the projection pixel size of the display image is corrected according to the viewing distance between the user and the projection surface, thereby suppressing jaggy feeling. It is possible to provide an image projection apparatus that achieves both improved sharpness.

[Fifth Embodiment]
In the fifth embodiment, an example is shown in which information indicating whether or not to perform pixel shifting determined according to the projection pixel size of the display image is corrected according to the viewing distance of the user. Hereinafter, configurations and processes different from those of the first embodiment will be described in detail, and descriptions of configurations and processes similar to those of the first embodiment will be omitted.

  FIG. 14 is a block diagram of the projection apparatus 100 according to the fifth embodiment.

  Based on the projection pixel size GSIZE acquired by the acquisition unit 105, the calculation unit 520 calculates the interpolation phase PHASE when the generation unit 102 generates the subframe images DIV1 and DIV2. The details of the method of calculating the interpolation phase PHASE will be specifically described below.

  First, the calculation unit 520 calculates a pixel shift control degree GZD from the projection pixel size GSIZE. An example of the calculation method is shown in FIG. The pixel shift control degree GZD can take a real value in the range of 0 to 1. 0 does not perform pixel shift, 1 performs pixel shift, and the degree of pixel shift control is varied in an analog manner within a range of 0 to 1. MAXTH and MINTH shown in FIG. 15 are threshold values for determining the pixel shift control degree GZD and may be determined arbitrarily by the user.

  Next, the calculation unit 520 calculates the interpolation phase PHASE based on the pixel shift control degree GZD. An example of the calculation method is shown in FIG.

  The interpolation phase PHESE indicates the amount of deviation from the phase that should be interpolated with respect to an image projected at a position shifted by 0.5 pixels when pixels are shifted. As the pixel shift control degree GZD increases, the interpolation phase PHASE decreases. This is because when the pixel shift control degree GZD is large, that is, when pixel shift is performed, it is only necessary to generate a divided image at a position where the normal 0.5 pixel phase is shifted. Conversely, when the pixel shift control degree GZD is small, when the pixel moving unit 110 shifts 0.5 pixels by shifting the interpolation phase in the direction in which the actual pixels exist from the position where the 0.5 pixel phase is shifted. Then, a divided image that does not perform pixel shifting is generated. Although FIG. 16 has been described in the one-dimensional direction, in practice, the data is two-dimensional data in the horizontal and vertical directions.

  Next, the operation of the generation unit 521 will be described. The generation unit 521 generates subframe images DIV1 and DIV2 according to the interpolation phase PHASE calculated by the interpolation phase calculation unit 520. FIG. 17 is a diagram illustrating an example of processing in the generation unit 521. In FIG. 17, “P0” indicates an interpolation position at a position shifted by 0.5 pixels, and “P1” indicates an interpolation position obtained by correcting the interpolation position of “P0” according to the interpolation phase PHASE. “P0” is obtained by linear interpolation using four pixels (U1, U2, D1, D2) around 2 rows and 2 columns of the image of the input video Vi. In FIG. 17, “ix_i” is an integer value for indicating the horizontal position of the pixel of the image of the input video Vi, and “ii_i” is the vertical position (vertical position) of the pixel of the image of the input video Vi. An integer value to indicate. “Ix_s” is a decimal value for indicating the horizontal position of the interpolation position P1, and “iy_s” is a decimal value for indicating the vertical position of the interpolation position P1. For example, the coordinates (horizontal position, vertical position) of the interpolation position P0 can be represented by (ix_i + ix_s, iy_i + ii_s).

  Further, the coordinates (horizontal position, vertical position) of the interpolation position P1 can be represented by (ix_i + ix_s + PHASE (X), iy_i + ii_s + PHASE (Y)).

  Next, a method for generating the interpolation position P1 will be described more specifically.

By interpolating the pixel values of the pixels U1, U2, D1, and D2 with weights “k” and “j” (weight based on the distance from the interpolation position P1) based on the distance, the interpolation pixel value OD at the interpolation position P1 is obtained. Calculated. k represents a weight in the horizontal direction, and j represents a weight in the vertical direction.
k and j are calculated by the following equations (2) and (3).
k = ix_s + PHASE (X) (2)
j = iy_s + PHASE (Y) (3)
The interpolated pixel value OD is calculated according to the following equation (4). In Expression (4), “U1 (ix_i, iy_i)” is the pixel value of the pixel U1, “U2 (ix_i + 1, iy_i)” is the pixel value of the pixel U2, and “D1 (ix_i, iy_i + 1)” is the pixel value of the pixel D1. , “D2 (ix_i + 1, iy_i + 1)” is the pixel value of the pixel D2.
OD = (U1 (ix_i, iy_i) × (1-k)
+ U2 (ix_i + 1, iy_i) × k) × j +
(D1 (ix_i, iy_i + 1) × (1-k)
+ D2 (ix_i + 1, iy_i + 1) * k) * (1-j) (4)
According to Expression (4), “1-k” (horizontal distance between the interpolation position P1 and the pixel U2) is used as the weight of the pixel value U1 (ix_i, iy_i), and the pixel value U2 (ix_i + 1, iy_i) “K” (the horizontal distance between the pixel U1 and the interpolation position P1) is used as the weight. Using these weights, the pixel value U1 (ix_i, iy_i) and the pixel value U2 (ix_i + 1, iy_i) are weighted and combined to calculate a first combined value.

  Further, “1-k” (horizontal distance between the interpolation position P1 and the pixel D2) is used as the weight of the pixel value D1 (ix_i, iy_i + 1), and “k” (the pixel value D2 (ix_i + 1, iy_i + 1) is weighted). Horizontal distance between the pixel D1 and the interpolation position P1) is used. Using these weights, the pixel value D1 (ix_i, iy_i + 1) and the pixel value D2 (ix_i + 1, iy_i + 1) are weighted and combined to calculate a second combined value.

  Then, “1-j” (the vertical distance between the lines of the pixels D1 and D2 and the interpolation position P1 (distance in the vertical direction)) is used as the weight of the first composite value. Further, “j” (vertical distance between the lines of the pixels U1 and U2 and the interpolation position P1) is used as the weight of the second composite value. Using these weights, the first composite value and the second composite value are weighted and combined to calculate the SC interpolation pixel value OD.

  The calculated interpolation pixel values OD calculated for all pixels are output as divided images DIV1 and DIV2.

  As described above, by controlling the interpolation phase of the divided image to be generated according to the projection pixel size of the display image, the image projection device that can control both jaggy feeling suppression and sharpness improvement in an analog manner. It becomes possible to provide.

[Sixth Embodiment]
In the sixth embodiment, an example in which the pixel shifting direction is shifted in four horizontal and vertical directions instead of 45 degrees obliquely. Hereinafter, configurations and processes different from those of the first embodiment will be described in detail, and descriptions of configurations and processes similar to those of the first embodiment will be omitted.

  FIG. 18 is a block diagram of a projection apparatus according to the sixth embodiment.

  In the sixth embodiment, when the input video Vi is input at a frame rate of 60 Hz, the synchronization signal output unit 623 outputs a synchronization signal TSIG of 240 Hz, which is four times that.

The generation unit 620 generates four sub-frame images to be switched and displayed for each frame by the pixel moving unit 622 from the image of the input video Vi. For example, the generation unit 620 generates the following four subframe images DIV1 to DIV4 for an image signal in the serial transmission format.
DIV1 = formed by pixel data of (horizontal: even number, vertical: even number) DIV2 = formed by pixel data of (horizontal: odd number, vertical: even number) DIV3 = (horizontal: odd number, vertical: odd number) The pixel data is formed by DIV4 = (horizontal: even-numbered, vertical: odd-numbered) pixel data. The four subframe images DIV1 to DIV4 generated by the generating unit 620 are processed by the pixel moving unit 622 as shown in FIG. In addition, the position is shifted and displayed in four subframes with respect to one frame of the input frame rate. Note that reference numerals 100 to 121, 220 to 221, 300 to 321, and 400 to 421 indicate pixels in each subframe. Using the subframe image DIV1 as a reference, the subframe image DIV2 is shifted by 0.5 pixels in the horizontal direction, and the subframe image DIV3 is shifted by 0.5 pixels in the horizontal direction and 0.5 pixels in the vertical direction. The sub-frame image DIV4 is projected at a position shifted by 0.5 pixels in the vertical direction.

  The selection unit 621 selects one of the subframe images DIV1 to DIV4 in the preset order according to the synchronization signal TSIG from the synchronization signal output unit 623, and outputs the subframe images DIV1 to DIV4 as the subframe image SELD. To do. The selection order is, for example, the order of subframe images DIV1 → DIV2 → DIV3 → DIV4. That is, the selection unit 621 reads the subframe image at a layer density four times that of the input video Vi. When the input image Vi is input at a speed of 60 Hz, the SELD is read at 240 Hz. That is, the number of display times for one input frame is four.

  As described above, the pixel moving unit 622 projects the output image (four subframe images) of the panel unit 109 by shifting the position every other frame. Details of the positional relationship are as shown in FIG.

  In the present embodiment, the display method is described in which the display positions are sequentially shifted with respect to the four subframes DIV1 to DIV4. However, the number of subframe images is not limited to four, and other numbers may be used. Good. For example, the image may be divided into eight divided images DIV1 to DIV8 and displayed. In this case, display with higher definition than in the case of four is possible.

  As described above, it is possible to provide an image projection apparatus that simultaneously suppresses jaggy and improves sharpness by adaptively controlling the pixel shifting effect in the four horizontal and vertical directions according to the projection pixel size of the display image. Is possible.

[Other embodiments]
The present invention supplies a program that realizes one or more functions of the above-described embodiments to a system or apparatus via a network or a storage medium, and one or more processors in the computer of the system or apparatus read and execute the program This process can be realized. It can also be realized by a circuit (for example, ASIC) that realizes one or more functions.

DESCRIPTION OF SYMBOLS 100 ... Projection apparatus, 101 ... Synchronization signal output part, 102, 521, 620 ... Divided image generation part, 103, 621 ... Selection part, 105 ... Acquisition part, 106 ... Memory | storage part, 107 ... Determination part, 108 ... Panel control part 109: Panel unit, 110, 622 ... Pixel moving unit, 111 ... Light source control unit, 112 ... Light source unit, 220 ... Feature quantity acquisition unit, 221, 322, 421 ... Determination result correction unit, 320 ... Enlargement rate acquisition unit, 321 ... Enlargement processing unit, 420 ... Viewing distance acquisition unit, 520 ... Interpolation phase calculation unit

Claims (14)

A light source that emits light;
A modulation element that modulates the light emitted from the light source with a predetermined resolution and outputs a projected image;
Moving means for moving the projection position on the projection surface of the projected image;
Control means for controlling the modulation element and the moving means based on an input frame;
Obtaining means for obtaining a parameter relating to a pixel size of the projection image on the projection plane;
With
The control unit controls the moving unit to move the projection position when the pixel size of the projection image is equal to or larger than a predetermined value; otherwise, the moving unit sets the projection position. A projection apparatus that is controlled so as not to move.   The projection apparatus according to claim 1, wherein the parameter is a value indicating a pixel size of the projection image.   The parameter is a value indicating a distance between the projection device and the projection plane, and when the distance is smaller than a predetermined distance, the pixel size of the projection image is equal to or greater than the predetermined value. The projection apparatus according to claim 1. Further comprising: generating means for generating a plurality of sub-frames corresponding to a plurality of positions where the moving means moves the projection position based on the frame;
The control means controls the modulation element based on each subframe, and controls the moving means so that a projection image corresponding to each subframe is projected at a corresponding projection position. The projection apparatus according to 1. A second obtaining unit for obtaining a contrast of the image of the frame;
The control means includes
Referring to a preset first threshold for comparison with the contrast, a second threshold greater than the first threshold;
If the contrast is smaller than the first threshold, the moving means is controlled so as not to move the projection position;
When the contrast is between the first threshold and the second threshold, the moving means is controlled based on a comparison between the pixel size of the projected image and the predetermined value;
5. The projection apparatus according to claim 1, wherein when the contrast is larger than the second threshold value, the moving unit is controlled to move the projection position. 6. A third acquisition means for acquiring an enlargement ratio for generating the projection image from the image of the frame;
The control means includes
With reference to a preset first threshold value for comparison with the enlargement factor, a second threshold value greater than the first threshold value,
If the magnification is smaller than the first threshold, the moving means is controlled to move the projection position,
When the enlargement ratio is between the first threshold and the second threshold, the moving means is controlled based on a comparison between the pixel size of the projected image and the predetermined value;
5. The projection apparatus according to claim 1, wherein when the enlargement ratio is greater than the second threshold, the moving unit is controlled so as not to move the projection position. 6. A fourth acquisition means for acquiring a distance between the projection plane and the viewer;
The control means includes
Refer to a preset first threshold for comparison with the distance, a second threshold greater than the first threshold,
If the distance is smaller than the first threshold, the moving means is controlled to move the projection position,
When the distance is between the first threshold and the second threshold, the moving means is controlled based on a comparison between a pixel size of the projection image and the predetermined value;
5. The projection apparatus according to claim 1, wherein when the distance is greater than the second threshold, the moving unit is controlled so as not to move the projection position. 6. The generating means includes
Calculating means for calculating a pixel shift degree indicating a degree of pixel shift based on a pixel size of the projected image;
The projection apparatus according to claim 4, wherein the plurality of subframes are generated by performing interpolation based on the pixel shift degree. A projection device that projects an image on a projection surface,
A light source that emits light;
A modulation element that modulates the light emitted from the light source and outputs a projected image;
Moving means for moving the projection position on the projection surface of the projected image;
Obtaining means for obtaining a parameter relating to a distance between the projection surface and the projection device;
Control means for controlling whether or not the movement means performs movement of the projection position based on the distance between the projection plane and the projection apparatus;
With
The projection apparatus, wherein the control unit controls the movement unit not to move the projection position when a distance between the projection plane and the projection apparatus is a predetermined distance or less. The moving means alternates the position of the projected image on the previous projection plane between a first position and a second position shifted by half a pixel of the projected image in the horizontal and vertical directions with respect to the first position. It is possible to move to
The projection apparatus according to claim 9, wherein the control unit controls whether or not the distance between the projection plane and the projection apparatus moves the position of the projection image.   The control means controls the moving means to move the projection position when the distance between the projection plane and the projection device is longer than the predetermined distance. Or the projection apparatus of Claim 10. A projection apparatus comprising: a light source that emits light; a modulation element that modulates the light emitted from the light source with a predetermined resolution to output a projection image; and a moving unit that moves a projection position on a projection plane of the projection image. A control method,
A control step of controlling the modulation element and the moving means based on the input frame;
An acquisition step of acquiring a parameter relating to a pixel size of the projection image on the projection plane;
With
The control step controls the moving means to move the projection position when the pixel size of the projected image is equal to or larger than a predetermined value; otherwise, the moving means sets the projection position. A control method for a projection apparatus, characterized in that the projector is controlled so as not to move. Control of a projection apparatus comprising: a light source that emits light; a modulation element that modulates the light emitted from the light source and outputs a projection image; and a moving unit that moves a projection position on the projection plane of the projection image A method,
An acquisition step of acquiring a parameter relating to a distance between the projection plane and the projection device;
A control step of controlling whether or not the moving means executes the movement of the projection position based on the distance between the projection plane and the projection device;
With
The control step includes controlling the projection device so that the moving means does not move the projection position when the distance between the projection plane and the projection device is a predetermined distance or less. Method.   A program for causing a processor to execute each step of the control method for the projection apparatus according to claim 12 or 13.

Images