4. 有线图传显示无法显示xga画质？
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    • 有线图传显示无法显示xga画质？

    • M

      使用有线图传显示，画质为xga，显示不完整且运行一会就卡死，是硬件不支持吗，需要怎样才能显示xga图像

      
# Barcode Example
#
# This example shows off how easy it is to detect bar codes using the
# OpenMV Cam M7. Barcode detection does not work on the M4 Camera.

import sensor, image, time, math,tv
import time
from pyb import Pin, Timer

# 50kHz pin6 timer2 channel1
#light = Timer(2, freq=50000).channel(1, Timer.PWM, pin=Pin("P6"))
#light.pulse_width_percent(10) # adjust light 0~100

import sensor, image, time
sensor.reset()
sensor.set_pixformat(sensor.GRAYSCALE)
sensor.set_framesize(sensor.XGA) # High Res!
sensor.set_windowing((1000, 400))# V Res of 80 == less work (40 for 2X the speed).
sensor.skip_frames(time = 2000)
sensor.set_auto_gain(False)  # must turn this off to prevent image washout...
sensor.set_auto_whitebal(False)  # must turn this off to prevent image washout...
clock = time.clock()
tv.init() # 初始化tv
tv.channel(8) # 用于无线图传扩展板
# Barcode detection can run at the full 640x480 resolution of your OpenMV Cam's
# OV7725 camera module. Barcode detection will also work in RGB565 mode but at
# a lower resolution. That said, barcode detection requires a higher resolution
# to work well so it should always be run at 640x480 in grayscale...

def barcode_name(code):
    if(code.type() == image.EAN2):
        return "EAN2"
    if(code.type() == image.EAN5):
        return "EAN5"
    if(code.type() == image.EAN8):
        return "EAN8"
    if(code.type() == image.UPCE):
        return "UPCE"
    if(code.type() == image.ISBN10):
        return "ISBN10"
    if(code.type() == image.UPCA):
        return "UPCA"
    if(code.type() == image.EAN13):
        return "EAN13"
    if(code.type() == image.ISBN13):
        return "ISBN13"
    if(code.type() == image.I25):
        return "I25"
    if(code.type() == image.DATABAR):
        return "DATABAR"
    if(code.type() == image.DATABAR_EXP):
        return "DATABAR_EXP"
    if(code.type() == image.CODABAR):
        return "CODABAR"
    if(code.type() == image.CODE39):
        return "CODE39"
    if(code.type() == image.PDF417):
        return "PDF417"
    if(code.type() == image.CODE93):
        return "CODE93"
    if(code.type() == image.CODE128):
        return "CODE128"

while(True):
    clock.tick()
    img = sensor.snapshot()

    codes = img.find_barcodes()
    codeh = 0
    y = 10000000
    print(len(codes))
    if (len(codes)>1):
        for code in codes:
            img.draw_rectangle(code.rect())
            y1 =code.y()
            print(y1)
            if(y1<y):
                y = y1
                codeh = code

        if(codeh != ""):
            print_args = (barcode_name(codeh), codeh.payload(), (180 * codeh.rotation()) / math.pi, codeh.quality(), clock.fps())
            print("Barcode %s, Payload \"%s\", rotation %f (degrees), quality %d, FPS %f" % print_args)

    else:
        for code in codes:
            img.draw_rectangle(code.rect())
            codeh = code
            print_args = (barcode_name(codeh), codeh.payload(), (180 * codeh.rotation()) / math.pi, codeh.quality(), clock.fps())
            print("Barcode %s, Payload \"%s\", rotation %f (degrees), quality %d, FPS %f" % print_args)


    #img.lens_corr(1.8) # strength of 1.8 is good for the 2.8mm lens.
    for code in img.find_qrcodes():
        img.draw_rectangle(code.rect(), color = (255, 0, 0))
        print(code)
    tv.display(img)
    if not codes:
        print("FPS %f" % clock.fps())
      0

    • 图传扩展板的分辨率不支持xga。最高就是352x240。

      0
      M
       2 条回复
    • M

      @kidswong999请教一下大大 如果需要外接显示xga需要通过什么方式

      0
    • M

      @kidswong999 请教一下大大 如果需要外接显示xga需要通过什么方式

      0

    • 现在没有大的屏幕。

      0
      M
       1 条回复
    • M

      @kidswong999 请教一下大大 openmv有没有类似opencv 的resize函数 我把xga的图像压缩成352x240再显示

      0

    • img.crop()有scale参数：

      import sensor, image, time

sensor.reset()
sensor.set_pixformat(sensor.RGB565)
sensor.set_framesize(sensor.XGA)
sensor.skip_frames(time = 2000)

clock = time.clock()

while(True):
    clock.tick()
    img = sensor.snapshot()
    img.crop(x_scale=0.3125, y_scale=0.3125)
    print(clock.fps())
      0
      M
       2 条回复
    • M

      @kidswong999 请教一下大大，现在图片测试程序是可以到缩放到325x240，可以正常显示，但是代入程序后显示还是卡死，如何解决？

      测试代码

      import sensor, image, time ,tv

sensor.reset()
sensor.set_pixformat(sensor.GRAYSCALE)
sensor.set_framesize(sensor.XGA)
sensor.skip_frames(time = 2000)

clock = time.clock()
tv.init() # 初始化tv
tv.channel(8) # 用于无线图传扩展板
while(True):
    clock.tick()
    img = sensor.snapshot()
    img.crop(x_size=325, y_size=240)
    tv.display(img)
    print(clock.fps())

      代入代码

      # Barcode Example
#
# This example shows off how easy it is to detect bar codes using the
# OpenMV Cam M7. Barcode detection does not work on the M4 Camera.

import sensor, image, time, math,tv
import time
from pyb import Pin, Timer

# 50kHz pin6 timer2 channel1
#light = Timer(2, freq=50000).channel(1, Timer.PWM, pin=Pin("P6"))
#light.pulse_width_percent(10) # adjust light 0~100

import sensor, image, time
sensor.reset()
sensor.set_pixformat(sensor.GRAYSCALE)
sensor.set_framesize(sensor.XGA) # High Res!
sensor.set_windowing((1000, 400))# V Res of 80 == less work (40 for 2X the speed).
sensor.skip_frames(time = 2000)
sensor.set_auto_gain(False)  # must turn this off to prevent image washout...
sensor.set_auto_whitebal(False)  # must turn this off to prevent image washout...
clock = time.clock()
tv.init() # 初始化tv
tv.channel(8) # 用于无线图传扩展板
# Barcode detection can run at the full 640x480 resolution of your OpenMV Cam's
# OV7725 camera module. Barcode detection will also work in RGB565 mode but at
# a lower resolution. That said, barcode detection requires a higher resolution
# to work well so it should always be run at 640x480 in grayscale...

def barcode_name(code):
    if(code.type() == image.EAN2):
        return "EAN2"
    if(code.type() == image.EAN5):
        return "EAN5"
    if(code.type() == image.EAN8):
        return "EAN8"
    if(code.type() == image.UPCE):
        return "UPCE"
    if(code.type() == image.ISBN10):
        return "ISBN10"
    if(code.type() == image.UPCA):
        return "UPCA"
    if(code.type() == image.EAN13):
        return "EAN13"
    if(code.type() == image.ISBN13):
        return "ISBN13"
    if(code.type() == image.I25):
        return "I25"
    if(code.type() == image.DATABAR):
        return "DATABAR"
    if(code.type() == image.DATABAR_EXP):
        return "DATABAR_EXP"
    if(code.type() == image.CODABAR):
        return "CODABAR"
    if(code.type() == image.CODE39):
        return "CODE39"
    if(code.type() == image.PDF417):
        return "PDF417"
    if(code.type() == image.CODE93):
        return "CODE93"
    if(code.type() == image.CODE128):
        return "CODE128"

while(True):
    clock.tick()
    img = sensor.snapshot()

    codes = img.find_barcodes()
    codeh = 0
    y = 10000000
    print(len(codes))
    if (len(codes)>1):
        for code in codes:
            img.draw_rectangle(code.rect())
            y1 =code.y()
            print(y1)
            if(y1<y):
                y = y1
                codeh = code

        if(codeh != ""):
            print_args = (barcode_name(codeh), codeh.payload(), (180 * codeh.rotation()) / math.pi, codeh.quality(), clock.fps())
            print("Barcode %s, Payload \"%s\", rotation %f (degrees), quality %d, FPS %f" % print_args)

    else:
        for code in codes:
            img.draw_rectangle(code.rect())
            codeh = code
            print_args = (barcode_name(codeh), codeh.payload(), (180 * codeh.rotation()) / math.pi, codeh.quality(), clock.fps())
            print("Barcode %s, Payload \"%s\", rotation %f (degrees), quality %d, FPS %f" % print_args)


    #img.lens_corr(1.8) # strength of 1.8 is good for the 2.8mm lens.
    for code in img.find_qrcodes():
        img.draw_rectangle(code.rect(), color = (255, 0, 0))
        print(code)


    img.crop(x_scale=0.352, y_scale=0.6)
    tv.display(img)


    if not codes:
        print("FPS %f" % clock.fps())
      0
    • M

      @kidswong999 加入压缩图片函数 代入代码后也是无法显示 img.compressed(1)

      0

    • 我运行测试代码没有出现错误

      固件版本：4.0.1
      硬件：OpenMV4 Plus, OV5640

      0
      M
       1 条回复
    • M

      @kidswong999 好的 我寄回去测试吧 感谢大大

      0