Color Sensor

A color sensor is a device that detects and measures the color of an object or surface. It typically uses a light source and a detector to determine the spectral reflectance of the object, which is then used to calculate the color. Color sensors are used in a wide range of applications, including printing, quality control, color matching, and robotics. They can be found in a variety of devices, such as cameras, smartphones, and industrial automation systems. Color sensors can detect a wide range of colors, including RGB (red, green, blue) and CMYK (cyan, magenta, yellow, black) color spaces.

相关问题

import sensor, image import lcd from machine import UART from fpioa_manager import fm lcd.init()# sensor.reset()#sensor复位 sensor.set_pixformat(sensor.RGB565)#RGB格式 sensor.set_framesize(sensor.QVGA)#分辨率QVGA320*240 sensor.run(1) sensor.set_vflip(1) #设置摄像头翻转 red_color_m = (38, 71, 20, 54, -14, 41) red_color_i = (11, 75, 11, 103, -36, 72) y=0 while(True): img = sensor.snapshot()#获取一帧图像 i = img.find_blobs( [red_color_m] ,roi=(60,0,200,240), area_threshold=500,merge=True) m = img.find_blobs( [red_color_i] ,roi=(0,56,55,131),area_threshold=500) a = img.find_blobs( [red_color_i] ,roi=(280,50,55,139),area_threshold=500) if i: for sor in i: img.draw_rectangle( sor[0:4] ,color=lcd.GREEN) img.draw_cross( sor[5],sor[6],color=lcd.WHITE,size=3) temp = img.get_pixel( sor[5],sor[6] )#得到此处的颜色像素值（灰度orRGB） if y > 2: print(sor[5]) y=0 if m: for mi in m: img.draw_rectangle( mi[0:4] ,color=lcd.RED) img.draw_cross( mi[5],mi[6],color=lcd.WHITE,size=3) temp = img.get_pixel( mi[5],mi[6] )#得到此处的颜色像素值（灰度orRGB） print("cross\n") if a: for ao in a: img.draw_rectangle( ao[0:4] ,color=lcd.RED) img.draw_cross( ao[5],ao[6],color=lcd.WHITE,size=3) temp = img.get_pixel( ao[5],ao[6] )#得到此处的颜色像素值（灰度orRGB） print("cross\n") lcd.display(img) y=y+1

这段代码是用于在摄像头拍摄的图像中检测红色物体，并在图像上标记出检测到的物体。代码中使用了OpenMV库中的函数来实现这些功能。

首先，代码初始化了LCD屏幕和摄像头，并设置摄像头的像素格式和分辨率。然后进入一个无限循环，在每次循环中获取一帧图像。

接下来，代码使用`img.find_blobs()`函数来寻找满足给定颜色范围的物体。在这段代码中，使用了两个不同的颜色范围来检测红色物体，分别是`red_color_m`和`red_color_i`。这两个颜色范围分别对应了不同的检测区域，`red_color_m`对应主要区域，`red_color_i`对应两个次要区域。函数返回的是一个包含物体位置和大小等信息的列表。

然后，代码使用`img.draw_rectangle()`和`img.draw_cross()`函数在图像上标记出检测到的物体。`img.draw_rectangle()`函数用于绘制矩形框，`img.draw_cross()`函数用于绘制十字线。这些函数的参数是物体的位置和大小等信息。

最后，代码使用`lcd.display()`函数将处理后的图像显示在LCD屏幕上。

需要注意的是，代码中还有一些其他的处理逻辑，比如获取特定位置的像素值和打印信息等。这些逻辑可以根据实际需求进行调整和修改。

# Single Color Code Tracking Example # # This example shows off single color code tracking using the CanMV Cam. # # A color code is a blob composed of two or more colors. The example below will # only track colored objects which have both the colors below in them. import sensor, image, time, math # Color Tracking Thresholds (L Min, L Max, A Min, A Max, B Min, B Max) # The below thresholds track in general red/green things. You may wish to tune them... thresholds = [(30, 100, 15, 127, 15, 127), # generic_red_thresholds -> index is 0 so code == (1 << 0) (30, 100, -64, -8, -32, 32)] # generic_green_thresholds -> index is 1 so code == (1 << 1) # Codes are or'ed together when "merge=True" for "find_blobs". sensor.reset() sensor.set_pixformat(sensor.RGB565) sensor.set_framesize(sensor.QVGA) sensor.skip_frames(time = 2000) sensor.set_auto_gain(False) # must be turned off for color tracking sensor.set_auto_whitebal(False) # must be turned off for color tracking clock = time.clock() # Only blobs that with more pixels than "pixel_threshold" and more area than "area_threshold" are # returned by "find_blobs" below. Change "pixels_threshold" and "area_threshold" if you change the # camera resolution. "merge=True" must be set to merge overlapping color blobs for color codes. while(True): clock.tick() img = sensor.snapshot() for blob in img.find_blobs(thresholds, pixels_threshold=100, area_threshold=100, merge=True): if blob.code() == 3: # r/g code == (1 << 1) | (1 << 0) # These values depend on the blob not being circular - otherwise they will be shaky. # if blob.elongation() > 0.5: # img.draw_edges(blob.min_corners(), color=(255,0,0)) # img.draw_line(blob.major_axis_line(), color=(0,255,0)) # img.draw_line(blob.minor_axis_line(), color=(0,0,255)) # These values are stable all the time. img.draw_rectangle(blob.rect()) img.draw_cross(blob.cx(), blob.cy()) # Note - the blob rotation is unique to 0-180 only. img.draw_keypoints([(blob.cx(), blob.cy(), int(math.degrees(blob.rotation())))], size=20) print(clock.fps())

这段代码是一个单色码跟踪的示例，使用了CanMV Cam进行跟踪。它会跟踪具有下列颜色的物体：

1. 红色：亮度范围在30到100之间，A通道范围在15到127之间，B通道范围在15到127之间。
2. 绿色：亮度范围在30到100之间，A通道范围在-64到-8之间，B通道范围在-32到32之间。

代码中使用了图像传感器来捕获图像，并进行颜色跟踪。通过设置阈值来确定跟踪颜色的范围。然后，使用`find_blobs`函数找到符合阈值要求的颜色块，并绘制出来。最后，打印出每秒处理的帧数。

请注意，这段代码中的阈值是一些通用的阈值，你可能需要根据实际情况进行调整。