CN107909550B - Method and device for shooting and packaging fisheye lens - Google Patents
Method and device for shooting and packaging fisheye lens Download PDFInfo
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- 238000004806 packaging method and process Methods 0.000 title claims abstract description 15
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- 230000006835 compression Effects 0.000 claims description 6
- 238000007906 compression Methods 0.000 claims description 6
- 230000001131 transforming effect Effects 0.000 claims description 5
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- 238000003709 image segmentation Methods 0.000 claims 1
- 230000005540 biological transmission Effects 0.000 abstract description 6
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- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T3/00—Geometric image transformation in the plane of the image
- G06T3/40—Scaling the whole image or part thereof
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T3/00—Geometric image transformation in the plane of the image
- G06T3/40—Scaling the whole image or part thereof
- G06T3/4038—Scaling the whole image or part thereof for image mosaicing, i.e. plane images composed of plane sub-images
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- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/85—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using pre-processing or post-processing specially adapted for video compression
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- G—PHYSICS
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- G06T2207/00—Indexing scheme for image analysis or image enhancement
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- G06T2207/10016—Video; Image sequence
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- G06T2207/20—Special algorithmic details
- G06T2207/20021—Dividing image into blocks, subimages or windows
Abstract
The invention provides a method and a device for shooting and packaging a fisheye lens, which comprises the steps of obtaining an image shot by the fisheye lens, and stretching a picture in the image to two sides of an x axis to remove a black edge on the image; amplifying the central part of the image with the black edges removed; dividing the image to compress each divided part into half of the original part; the right half of the compressed image is cut and spliced to the left. Therefore, the method and the device can solve the technical problems that the image shot by the fisheye lens is not clear and the bandwidth is wasted in the transmission process in the prior art.
Description
Technical Field
The invention relates to the field of photography and video shooting, in particular to a method and a device for shooting and packaging a fisheye lens.
Background
Currently, the most common fisheye lens captures a significant portion of an image similar to that shown in fig. 1. Wherein the fisheye lens is a lens having a focal length of 16mm or less and a viewing angle of approximately 180 °. It is an extreme wide-angle lens, and the "fish-eye lens" is its common name. In order to maximize the angle of view of the lens, the front lens of the lens is short in diameter and is parabolic and convex toward the front of the lens, much like the fish eye, so called "fish-eye lens". Meanwhile, the fisheye lens shooting package means that a video is subjected to a series of processing before being pushed to a network, for example, a mode of moving the position, changing colors and the like to process the video, so that a new video suitable for network transmission is obtained, and the processed new video and audio are collected.
In the process of implementing the invention, the inventor finds that at least the following problems exist in the prior art: the image shot by the existing fisheye lens has too many black edges, and the black edges can cause the transmitted image to be large. Meanwhile, there are noisy points without information in the black border. In the process of video transmission, image processing software cannot identify whether the information is real information or meaningless noise, and the information and the noise are transmitted together with normal images, so that the waste of bandwidth is caused.
Disclosure of Invention
In view of the above, the present invention provides a method and an apparatus for shooting and packaging a fisheye lens, which can solve the technical problems in the prior art that an image shot by the fisheye lens is not clear, and bandwidth is wasted in a transmission process.
To achieve the above object, according to one aspect of the present invention, there is provided a method of a fisheye lens capture package.
The method for shooting and packaging the fisheye lens comprises the following steps: acquiring an image shot by a fisheye lens, and stretching a picture in the image to two sides of an x axis to remove a black edge on the image; amplifying the central part of the image with the black edges removed; dividing the image to compress each divided part into half of the original part; the right half of the compressed image is cut and spliced to the left.
Optionally, stretching the picture in the image to two sides of the x-axis includes: transformation formula for transforming the original position (x, y) to the new position (newX, y): newX ═ sqrt (R × R-y ×)/R; wherein R is the radius of the circle and sqrt is the square of the square.
Optionally, the enlarging the central portion of the image with the black edges removed includes: the image is expanded in the X and Y axes, respectively, or only in the X axis, or only in the Y axis.
Optionally, the formula that expands on the X-axis: (x ═ 0, 1); when x <0.4, then newX — x 4/3; when 0.4< x <0.6, then newX ═ 0.4/3+ x; when x >0.6, then newX 2/3 x + 1/3;
the formula that expands on the Y-axis: (Y ═ 0, 1); when Y <0.4, then newY — Y4/3; when 0.4< Y <0.6, then newY ═ 0.4/3+ Y; when Y >0.6, then newY 2/3 × Y + 1/3.
Optionally, the segmenting the image to compress each segmented part into one half of the original part respectively includes: transversely dividing the image shot by the fisheye with the black edge removed and the central part enlarged once from the middle, vertically dividing the image once again, and finally dividing the image into 4 parts; for each part, the length of the part is not changed when the distance between the part and the middle is small in the two horizontal end edges, and the part is compressed towards the middle when the distance between the part and the middle is large; and the transformation formula when compressing the horizontal end with large distance from the middle is as follows: newX ═ x (1-y/2); x, y are home positions; newX is the new x position after transformation, y is unchanged.
Optionally, the cutting down the right half of the compressed image and stitching to the left includes: cutting the compressed image from the middle along the Y axis and then cutting the image from the middle along the X axis; and splicing the image of the cut upper right part to the left side of the lower left part, and splicing the image of the lower right part to the left side of the upper left part.
According to another aspect of the embodiment of the present invention, there is also provided an apparatus for fish-eye lens shooting encapsulation, including an image obtaining module, configured to obtain an image shot by a fish-eye lens; the black edge removing module is used for stretching the picture in the image to two sides of an x axis so as to remove the black edge on the image; the central amplification module is used for amplifying the central part of the image with the black edges removed; the compression module is used for segmenting the image so as to compress each segmented part into one half of the original part; and the splicing module is used for cutting off the right half of the compressed image and splicing the right half to the left.
Optionally, when the black edge removing module stretches the picture in the image to two sides of the x-axis, the black edge removing module includes: transformation formula for transforming the original position (x, y) to the new position (newX, y): newX ═ sqrt (R × R-y ×)/R; wherein R is the radius of the circle and sqrt is the square of the square.
Optionally, when the black edge removing module enlarges a central portion of the image from which the black edge is removed, the black edge removing module includes: the image is expanded in the X and Y axes, respectively, or only in the X axis, or only in the Y axis.
Optionally, when the stitching module cuts the right half of the compressed image and stitches it to the left, the stitching module includes: cutting the compressed image from the middle along the Y axis and then cutting the image from the middle along the X axis; and splicing the image of the cut upper right part to the left side of the lower left part, and splicing the image of the lower right part to the left side of the upper left part.
According to the technical scheme of the invention, the black edges of the images shot by the fisheye lens are removed; moreover, the image with the black edges removed is amplified and compressed at the central part; and finally, cutting off the right half of the compressed image and splicing the right half of the compressed image to the left. Therefore, the technical effects of greatly improving the definition of the VR video and saving the bandwidth in the VR video transmission process are achieved.
Further effects of the above-mentioned non-conventional alternatives will be described below in connection with the embodiments.
Drawings
The drawings are included to provide a better understanding of the invention and are not to be construed as unduly limiting the invention. Wherein:
FIG. 1 is a schematic illustration of an image taken by a prior art fisheye lens;
fig. 2 is a schematic main flow chart of a fisheye lens shooting and packaging method according to an embodiment of the invention;
FIG. 3 is a schematic view of an image after stretching to both sides of the x-axis according to an embodiment of the present invention;
FIG. 4 is a schematic image with a central portion enlarged according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of an image after compression according to an embodiment of the invention;
FIG. 6 is a schematic illustration of images after stitching according to an embodiment of the present invention;
fig. 7 is a main structural schematic diagram of a fisheye lens shooting packaging device according to an embodiment of the invention.
Detailed Description
Exemplary embodiments of the present invention are described below with reference to the accompanying drawings, in which various details of embodiments of the invention are included to assist understanding, and which are to be considered as merely exemplary. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the invention. Also, descriptions of well-known functions and constructions are omitted in the following description for clarity and conciseness.
Fig. 2 is a schematic main flow diagram of a fisheye lens shooting and packaging method according to an embodiment of the present invention, where the fisheye lens shooting and packaging method may include:
in step S201, an image captured by the fisheye lens is acquired.
Step S202, stretching the picture in the image to two sides of the x axis to remove the black edge on the image. The specific implementation process comprises the following steps:
assuming that the fisheye lens is circular, in order to clear the black border of the fisheye lens photographed rear edge, a transformation formula for transforming the original position (x, y) to the new position (newX, y): newX ═ sqrt (R × R-y ×)/R. Wherein R is the radius of the circle and sqrt is the square of the square. Therefore, an image obtained by stretching the screen of the image to both sides of the x-axis may be as shown in fig. 3. It should be noted that the above embodiment can be applied not only to the fisheye lens being circular, but also to the elliptical lens and the like being longitudinally compressed into a circular shape.
In step S203, the image from which the black border has been removed is enlarged at the center.
In the embodiment, in order to ensure that the central part of the fisheye shot can be clear enough after being enlarged, the image after the image is stretched towards the two sides of the X axis is expanded on the X axis and the Y axis. The central portion refers to a portion to be enlarged in the image.
Formula extending on the X-axis: (x ═ 0, 1);
when x <0.4, then newX — x 4/3.
When 0.4< x <0.6, then newX is 0.4/3+ x.
When x >0.6, then newX 2/3 x + 1/3.
Formula extending on the Y-axis: (Y ═ 0, 1);
when Y <0.4, then newY — Y4/3.
When 0.4< Y <0.6, then newY is 0.4/3+ Y.
When Y >0.6, then newY 2/3 × Y + 1/3.
Therefore, different spreading formulas can be selected to trade off greater or lesser center resolution depending on the situation, as shown in FIG. 4.
Preferably, a central portion where x and Y are both [0,0.4] may be selected for expansion.
It is noted that the image may be expanded in the X and Y axes as shown above in the center portion, or the image may be expanded only in the X axis or only in the Y axis.
Step S204, the image is divided so as to compress each divided part into half of the original part.
In the embodiment, the image captured by the fish eye is enlarged by the black edge and the central portion to form a rectangle. This rectangle is now divided once across the middle, once again on edge, and finally divided into 4 segments. For each portion, the length does not change when the distance from the middle is small in both horizontal end sides, and the length compresses toward the middle when the distance from the middle is large. And the transformation formula when compressing the horizontal end with large distance from the middle is as follows: newX ═ x (1-y/2); x, y are home positions. newX is the new x position after transformation, y is unchanged.
It can be seen that the image edge processed by step S204 is reduced. In shooting, most attention is often put in the middle of a screen, so that definition of the edges of the screen is not required to be high, and bandwidth can be greatly saved by sacrificing definition of some edges.
Step S205 cuts the right half of the compressed image and splices it to the left.
In the embodiment, since an image similar to a diamond is obtained after step S204 (as shown in fig. 5), in order to transmit the compressed image, the compressed image needs to be cut and spliced. The specific implementation process comprises the following steps:
the compressed image is cut from the middle along the Y-axis and then from the middle along the X-axis. Then the image of the upper right part after cutting is spliced to the left side of the lower left part, and the image of the lower right part is spliced to the left side of the upper left part. As shown in fig. 6, is a stitched image.
According to the various embodiments of the fisheye lens shooting packaging method described above, it can be seen that the present invention utilizes a rectangle to the maximum extent and can enhance the resolution of the central portion at will. In VR video transmission, often use the fisheye to shoot the form and transmit, use this encapsulation scheme can promote the definition of VR video greatly to whether can select at will and enlarge the central part. In addition, the ratio of the middle to the periphery of the image shot by the fisheye lens is adjusted, the edge is compressed and the black edge is removed under the condition of the same definition in the middle, so that the bandwidth required by transmitting the part can be saved, and the bandwidth in the process of transmitting the VR video is saved.
In another aspect of the embodiment of the present invention, a fisheye lens shooting packaging apparatus is further provided, and referring to fig. 7, the fisheye lens shooting packaging apparatus 700 includes an image obtaining module 701, a black edge removing module 702, a central enlarging module 703, a compressing module 704, and a splicing module 705. The image acquisition module 701 may acquire an image captured by the fisheye lens, and the black border removal module 702 stretches the picture in the image to two sides of the x axis to remove the black border on the image. Then, the central amplification module 703 may amplify the central portion of the image from which the black edge is removed; and, the compression module 704 divides the image to compress each divided part into half of the original part. Finally, the stitching module 705 cuts the right half of the compressed image and stitches it to the left.
In a preferred embodiment, the black border removal module 702 can transform the original position (x, y) to the new position (newX, y) in the process of removing the black border of the image according to a transformation formula: newX ═ sqrt (R × R-y ×)/R. Wherein R is the radius of the circle and sqrt is the square of the square.
In another preferred embodiment, the central enlarging module 703 expands the image after stretching the image to both sides of the X-axis in the X-and Y-axes in order to ensure that the central part of the fisheye shot still can be clear enough. The central portion refers to a portion to be enlarged in the image.
Formula extending on the X-axis: (x ═ 0, 1);
when x <0.4, then newX — x 4/3.
When 0.4< x <0.6, then newX is 0.4/3+ x.
When x >0.6, then newX 2/3 x + 1/3.
Formula extending on the Y-axis: (Y ═ 0, 1);
when Y <0.4, then newY — Y4/3.
When 0.4< Y <0.6, then newY is 0.4/3+ Y.
When Y >0.6, then newY 2/3 × Y + 1/3.
It is worth noting that the central enlarging module 703 may expand the image in the X and Y axes as shown above for the central portion, or may expand the image only in the X axis or only in the Y axis.
As a reference example, the compression module 704 may divide the image captured by the fisheye enlarged by removing the black edge and the central portion once from the middle, once again, once on the right, and finally, divided into 4 parts. For each portion, the length does not change when the distance from the middle is small in both horizontal end sides, and the length compresses toward the middle when the distance from the middle is large. And the transformation formula when compressing the horizontal end with large distance from the middle is as follows: newX ═ x (1-y/2); x, y are home positions. newX is the new x position after transformation, y is unchanged.
In addition, when the stitching module 705 cuts the right half of the compressed image and stitches it to the left, the compressed image may be cut from the middle along the Y-axis and then cut from the middle along the X-axis. Then the image of the upper right part after cutting is spliced to the left side of the lower left part, and the image of the lower right part is spliced to the left side of the upper left part.
It should be noted that, in the implementation of the fisheye lens capture package device of the present invention, the details of the fisheye lens capture package method are already described in detail, and therefore, the repeated description is omitted here.
The above-described embodiments should not be construed as limiting the scope of the invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions can occur, depending on design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A method of fish-eye lens capture packaging, comprising:
acquiring an image shot by a fisheye lens, and stretching a picture in the image to two sides of an x axis to remove a black edge on the image;
amplifying the central part of the image with the black edges removed; dividing the image to compress each divided part into half of the original part;
cutting off the right half of the compressed image and splicing the right half of the compressed image to the left;
the image segmentation is performed to compress each segmented part into half of the original part, and the method includes:
transversely dividing the image shot by the fisheye with the black edge removed and the central part enlarged once from the middle, vertically dividing the image once again, and finally dividing the image into 4 parts;
for each part, the length of the part is not changed when the distance between the part and the middle is small in the two horizontal end edges, and the part is compressed towards the middle when the distance between the part and the middle is large; and the transformation formula when compressing the horizontal end with large distance from the middle is as follows: newX ═ x (1-y/2); x, y are home positions; newX is the new x position after transformation, y is unchanged;
wherein, cutting down the right half of the compressed image and splicing to the left comprises: cutting the compressed image from the middle along the Y axis and then cutting the image from the middle along the X axis;
and splicing the image of the cut upper right part to the left side of the lower left part, and splicing the image of the lower right part to the left side of the upper left part.
2. The method of claim 1, wherein stretching the picture in the image to both sides of the x-axis comprises:
transformation formula for transforming the original position (x, y) to the new position (newX, y): newX ═ sqrt (R × R-y ×)/R; wherein R is the radius of the circle and sqrt is the square of the square.
3. The method of claim 2, wherein the central portion magnifying the image with the black border removed comprises:
the image is expanded in the X and Y axes, respectively, or only in the X axis, or only in the Y axis.
4. The method of claim 3, wherein the formula that expands on the X-axis: (x ═ 0, 1);
when x <0.4, then newX — x 4/3;
when 0.4< x <0.6, then newX ═ 0.4/3+ x;
when x >0.6, then newX 2/3 x + 1/3;
the formula that expands on the Y-axis: (Y ═ 0, 1);
when Y <0.4, then newY — Y4/3;
when 0.4< Y <0.6, then newY ═ 0.4/3+ Y;
when Y >0.6, then newY 2/3 × Y + 1/3.
5. A fisheye lens shooting packaging hardware, comprising:
the image acquisition module is used for acquiring an image shot by the fisheye lens;
the black edge removing module is used for stretching the picture in the image to two sides of an x axis so as to remove the black edge on the image;
the central amplification module is used for amplifying the central part of the image with the black edges removed;
the compression module is used for segmenting the image so as to compress each segmented part into one half of the original part;
the splicing module is used for cutting off the right half of the compressed image and splicing the right half to the left;
wherein, the compression module divides the image to compress each divided part into half of the original part respectively, including:
transversely dividing the image shot by the fisheye with the black edge removed and the central part enlarged once from the middle, vertically dividing the image once again, and finally dividing the image into 4 parts;
for each part, the length of the part is not changed when the distance between the part and the middle is small in the two horizontal end edges, and the part is compressed towards the middle when the distance between the part and the middle is large; and the transformation formula when compressing the horizontal end with large distance from the middle is as follows: newX ═ x (1-y/2); x, y are home positions; newX is the new x position after transformation, y is unchanged;
wherein, the concatenation module cuts off the right half of the image after compressing and splices to the left side and includes: cutting the compressed image from the middle along the Y axis and then cutting the image from the middle along the X axis; and splicing the image of the cut upper right part to the left side of the lower left part, and splicing the image of the lower right part to the left side of the upper left part.
6. The apparatus of claim 5, wherein the black edge removing module, when stretching the picture in the image to two sides of the x-axis, comprises:
transformation formula for transforming the original position (x, y) to the new position (newX, y): newX ═ sqrt (R × R-y ×)/R; wherein R is the radius of the circle and sqrt is the square of the square.
7. The apparatus according to claim 5, wherein the black edge removing module, when performing central portion enlargement on the image with the black edge removed, comprises:
the image is expanded in the X and Y axes, respectively, or only in the X axis, or only in the Y axis.
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