CN107645659B - Camera module optical depth of field test device - Google Patents

Abstract

The invention discloses a camera module optical depth of field testing device which comprises a mounting frame, wherein a horizontally arranged sliding rail is arranged on the mounting frame, a module support is arranged on the mounting frame, and a camera module to be tested is arranged on the module support; the sliding rail is slidably matched with a plurality of target assemblies, each target assembly comprises a target provided with transverse scales and longitudinal scales, and the tested camera module and the target are perpendicular to the sliding rail; the camera module to be tested is electrically connected with the image sensor. According to the depth-of-field testing device, different depth-of-field evaluation and monitoring are achieved through an effective quantification means under the same state, the control of the depth of field of pictures shot by two modules is achieved, and a foundation is laid for combining two pictures to achieve a 3D effect.

Description

Camera module optical depth of field test device

Technical Field

The present invention relates to the technical field of optical camera module testing, and more specifically to a camera module optical depth of field testing device.

Background technique

As users pay more attention to the photography function of mobile phones, the combination of photography and mobile phones is becoming closer and closer. In recent years, the camera technology of smartphones has come to another new starting line, that is, dual-camera technology. From the initial attention it received when it first entered the field of vision to today, it has gradually been accepted by the public. At present, the dual-camera configurations on the market are different, that is, the two cameras are equal in size or one large and one small. How to achieve 3D and ranging effects (similar to human eyes) through the synthesis of two module images, in addition to the need for software synthesis, the control of module depth of field will be particularly important. At present, the depth of field effect is judged by sensory recognition of the camera by taking pictures of objects at different distances. The information obtained is not very accurate, and the effect of depth of field changes cannot be quantified.

Summary of the invention

The technical problem to be solved by the present invention is to provide a camera module optical depth of field testing device, which realizes different depths of field evaluation and monitoring through effective quantitative means under the same state, so as to control the depth of field of pictures taken by two modules, and lays a foundation for synthesizing two pictures to achieve 3D effect.

The technical solution of the present invention is to provide a camera module optical depth of field testing device with the following structure, including a mounting frame, the mounting frame is provided with a horizontally arranged slide rail, the mounting frame is provided with a module bracket, and the module bracket is installed with a camera module to be tested; a plurality of target plate assemblies are slidably fitted on the slide rail, the target plate assembly includes a target plate with horizontal and vertical scales, the camera module to be tested and the target plate are both perpendicular to the slide rail; the camera module to be tested is electrically connected to the image sensor.

After adopting the above structure, the camera module optical depth of field testing device of the present invention has the following advantages compared with the prior art:

The optical depth of field test device of the camera module of the present invention calculates the software MTF (Modulation Transfer Function) by using the information obtained by the image sensor reference plate, and performs linear comparison on the MTF Through Focus (optical modulation transfer function test defocus) of different positions to quantify the change process of the depth of field. It has the advantages of fast, accurate and specific quantification, and provides a strong theoretical correction basis for the depth of field correction of dual cameras. The test device of the present invention can effectively perform depth of field correction and monitoring on the camera module, greatly improving the competitiveness of the product.

As an improvement, the distance module bracket on the slide rail includes a first standard plate assembly, a second standard plate assembly, a third standard plate assembly, a fourth standard plate assembly, a fifth standard plate assembly and a sixth standard plate assembly from near to far. It also includes a seventh standard plate for attaching to the wall. After adopting this structure, the test effect is better.

As an improvement, the target plate assembly further includes a sliding bottom plate and a fixed bracket; the sliding bottom plate is slidably matched on the slide rail, the lower end of the fixed bracket is fixed on the slide rail, and the target plate is fixed on the upper end of the fixed bracket and close to the side of the module bracket. After adopting this structure, the structure is simple and easy to assemble.

As an improvement, the sliding bottom plate is provided with a long strip adjustment hole arranged along the length direction of the sliding bottom plate, and the fastener passes through the long strip adjustment hole to fix the fixed bracket on the sliding bottom plate. After adopting this structure, it is convenient to adjust the position of the fixed bracket on the sliding bottom plate.

As an improvement, the plane perpendicular to the track where the side of the camera module under test close to the first target plate is located is taken as the first reference plane, the shortest distance between the first target plate of the first target plate assembly and the first reference plane is 5-20cm; the shortest distance between the second target plate of the second target plate assembly and the first reference plane is 15-30cm; the shortest distance between the third target plate of the third target plate assembly and the first reference plane is 25-50cm; the shortest distance between the fourth target plate of the fourth target plate assembly and the first reference plane is 45-80cm; the shortest distance between the fifth target plate of the fifth target plate assembly and the first reference plane is 75-120cm; the shortest distance between the sixth target plate of the sixth target plate assembly and the first reference plane is 75-120cm; the shortest distance between the seventh target plate of the seventh target plate assembly and the first reference plane is 280-500cm.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram of the three-dimensional structure of the camera module optical depth of field testing device of the present invention.

As shown in the figure: 1. mounting frame, 2. slide rail, 3. module bracket, 5. sliding base plate, 501, long strip adjustment hole, 6. fixed bracket, 7. first standard plate, 8. second standard plate, 9. third standard plate, 10. fourth standard plate, 11. fifth standard plate, 12. sixth standard plate, 13. seventh standard plate, 14. camera module under test.

Detailed ways

The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

As shown in Figure 1, the camera module optical depth of field test device of the present invention includes a mounting frame 1, the mounting frame 1 is provided with a horizontally arranged slide rail 2, the mounting frame 1 is provided with a module bracket 3, and the module bracket 3 is installed with a camera module 14 to be tested; a plurality of target plate assemblies are slidably fitted on the slide rail 2, the target plate assembly includes a target plate 4 with horizontal and vertical scales, the camera module 14 to be tested and the target plate 4 are both perpendicular to the slide rail 2; the camera module 14 to be tested is electrically connected to the image sensor.

The target plate assembly further includes a sliding base plate 5 and a fixed bracket 6; the sliding base plate 5 is slidably matched on the slide rail 2, the lower end of the fixed bracket 6 is fixed on the slide rail 2, and the target plate 4 is fixed on the upper end of the fixed bracket 6 and close to the side of the module bracket 3. The slide rails 2 are provided on both sides of the mounting frame 1, and the two sides of the sliding base plate 5 are respectively matched on the slide rails 2 on both sides of the mounting frame 1. The sliding base plate 5 is provided with a long strip adjustment hole 501 arranged along the length direction of the sliding base plate 5, and the fastener passes through the long strip adjustment hole 501 to fix the fixed bracket 6 on the sliding base plate 5.

The slide rail 2 includes a first mark plate assembly, a second mark plate assembly, a third mark plate assembly, a fourth mark plate assembly, a fifth mark plate assembly and a sixth mark plate assembly from near to far from the module bracket 3, and also includes a seventh mark plate 13 for being attached to the wall.

The plane perpendicular to the track where the side of the camera module 14 to be tested close to the first mark plate 7 is located is taken as the first reference plane. The shortest distance between the first mark plate 7 of the first mark plate assembly and the first reference plane is 5-20cm; the shortest distance between the second mark plate 8 of the second mark plate assembly and the first reference plane is 15-30cm; the shortest distance between the third mark plate 9 of the third mark plate assembly and the first reference plane is 25-50cm; the shortest distance between the fourth mark plate 10 of the fourth mark plate assembly and the first reference plane is 45-80cm; the shortest distance between the fifth mark plate 11 of the fifth mark plate assembly and the first reference plane is 75-120cm; the shortest distance between the sixth mark plate 12 of the sixth mark plate assembly and the first reference plane is 75-120cm. The shortest distance between the seventh mark plate 13 of the seventh mark plate assembly and the first reference plane is 280-500cm.

Claims (5)

1. A camera module optical depth of field test device, characterized in that: it comprises a mounting frame and an image sensor, the mounting frame is provided with a horizontally arranged slide rail, the mounting frame is provided with a module bracket, and the module bracket is provided with a camera module to be tested; a plurality of target plate assemblies are slidably matched on the slide rail, the target plate assembly comprises a target plate with a horizontal scale and a vertical scale, the camera module to be tested and the target plate are both perpendicular to the slide rail; the camera module to be tested is electrically connected to the image sensor, the image sensor performs an optical modulation transfer function test on the information obtained by the target plate, and performs a linear comparison on the optical modulation transfer function test defocus of different positions captured to quantify the change process of the depth of field; The target plate assembly further comprises a sliding bottom plate and a fixed bracket; the sliding bottom plate is slidably fitted on the slide rail, the lower end of the fixed bracket is fixed on the slide rail, and the target plate is fixed on the upper end of the fixed bracket and close to one side of the module bracket; The sliding bottom plate is provided with a long strip adjustment hole arranged along the length direction of the sliding bottom plate, and the fastener passes through the long strip adjustment hole to fix the fixing bracket on the sliding bottom plate. 2. The camera module optical depth of field testing device according to claim 1 is characterized in that: the distance module bracket on the slide rail includes a first target plate assembly, a second target plate assembly, a third target plate assembly, a fourth target plate assembly, a fifth target plate assembly and a sixth target plate assembly from near to far. 3. The camera module optical depth of field testing device according to claim 2, characterized in that it also includes a seventh standard plate for being attached to a wall. 4. The optical depth of field test device of the camera module according to claim 2 or 3 is characterized in that: the plane perpendicular to the track where the side of the camera module under test close to the first target plate is located is taken as the first reference plane, and the shortest distance between the first target plate of the first target plate assembly and the first reference plane is 5-20cm; the shortest distance between the second target plate of the second target plate assembly and the first reference plane is 15-30cm; the shortest distance between the third target plate of the third target plate assembly and the first reference plane is 25-50cm; the shortest distance between the fourth target plate of the fourth target plate assembly and the first reference plane is 45-80cm; the shortest distance between the fifth target plate of the fifth target plate assembly and the first reference plane is 75-120cm; the shortest distance between the sixth target plate of the sixth target plate assembly and the first reference plane is 75-120cm. 5. The camera module optical depth of field testing device according to claim 4, characterized in that the shortest distance between the seventh target plate of the seventh target plate assembly and the first reference plane is 280-500 cm.